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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             -----------------------

                                    FORM 10-Q

(Mark One)

|X|   Quarterly Report Pursuant to Section 13 or 15(d) of
      the Securities Exchange Act of 1934

      For the Quarter Ended September 30, 2007

                                       OR

|_|   Transition Report Pursuant To Section 13 or 15(d) Of
      the Securities Exchange Act of 1934

      For the Transition Period from ___________ to ___________

                           Commission File No. 0-23047

                             -----------------------

                             SIGA Technologies, Inc.
             (Exact name of registrant as specified in its charter)

    A Delaware Corporation                          IRS Employer No. 13-3864870

               420 Lexington Avenue, Suite 408, New York, NY 10170
                         Telephone Number (212) 672-9100

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes |X| No |_|.

Indicate by check mark whether the registrant is a large  accelerated  filer, an
accelerated  filer, or a  non-accelerated  filer. See definition of "accelerated
filer and large  accelerated  filer" in Rule 12b-2 of the Exchange  Act.  (Check
one):

Large Accelerated Filer |_|   Accelerated Filer |_|   Non-Accelerated Filer |X|.

Indicate by check mark whether the  registrant is a shell company (as defined in
rule 12b-2 of the Exchange Act). Yes |_| No |X|.

As of November 7, 2007 the  registrant  had  33,900,561  shares of common  stock
outstanding.

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                             SIGA Technologies, Inc.

                                    Form 10-Q

                                Table of Contents



                                                                                                     Page No.
                                                                                                     
PART I FINANCIAL INFORMATION

Item 1.  Financial Statements .......................................................................    2

Item 2.  Management's Discussion and Analysis of Financial Condition and Results of Operations ......   11

Item 3.  Quantitative and Qualitative Disclosure About Market Risk ..................................   18

Item 4.  Controls and Procedures ....................................................................   18

PART II OTHER INFORMATION

Item 1.  Legal Proceedings ..........................................................................   19

Item 1A. Risk Factors ...............................................................................   19

Item 2.  Changes in Securities, Use of Proceeds and Issuer Purchases of Equity Securities ...........   19

Item 3.  Defaults Upon Senior Securities ............................................................   19

Item 4.  Submission of Matters to a Vote of Security Holders ........................................   19

Item 5.  Other Information ..........................................................................   19

Item 6.  Exhibits ...................................................................................   19

SIGNATURES ..........................................................................................   20



                                       1


PART I - FINANCIAL INFORMATION
Item 1 - Financial Statements

                             SIGA TECHNOLOGIES, INC.

                           CONSOLIDATED BALANCE SHEETS



                                                                                         Unaudited
                                                                                       September 30,         December 31,
                                                                                            2007                 2006
                                                                                       -------------         ------------
                                                                                                       
ASSETS
Current assets
   Cash and cash equivalents .......................................................   $  8,065,733          $ 10,639,530
   Accounts receivable .............................................................      1,016,873               617,032
   Prepaid expenses ................................................................        114,707               141,032
                                                                                       ------------          ------------
    Total current assets ...........................................................      9,197,313            11,397,594

   Property, plant and equipment, net ..............................................      1,283,829             1,320,315
   Goodwill ........................................................................        898,334               898,334
   Intangible assets, net ..........................................................         28,918               165,243
   Other assets ....................................................................        261,473               246,201
                                                                                       ------------          ------------
    Total assets ...................................................................   $ 11,669,867          $ 14,027,687
                                                                                       ============          ============

LIABILITIES AND STOCKHOLDERS' EQUITY
   Current liabilities
   Accounts payable ................................................................   $    985,733          $  1,357,906
   Accrued expenses and other ......................................................        685,380               584,504
   Notes payable ...................................................................             --               107,520
                                                                                       ------------          ------------
    Total current liabilities ......................................................      1,671,113             2,049,930

Non-current portion of notes payable ...............................................             --                22,809
Common stock warrants ..............................................................      4,705,296             4,673,098
                                                                                       ------------          ------------
    Total liabilities ..............................................................      6,376,409             6,745,837

Commitments and contingencies ......................................................             --                    --

Stockholders' equity
   Common stock ($.0001 par value, 100,000,000 shares authorized,
     33,778,061 and 32,452,210 issued and outstanding at September 30, 2007
     and December 31, 2006, respectively) ..........................................          3,378                 3,245
   Additional paid-in capital ......................................................     66,765,924            63,646,224
   Accumulated deficit .............................................................    (61,475,844)          (56,367,619)
                                                                                       ------------          ------------
    Total stockholders' equity .....................................................      5,293,458             7,281,850
                                                                                       ------------          ------------
    Total liabilities and stockholders' equity .....................................   $ 11,669,867          $ 14,027,687
                                                                                       ============          ============


   The accompanying notes are an integral part of these financial statements.


                                       2


                             SIGA TECHNOLOGIES, INC.

                CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)



                                                                       Three Months Ended                  Nine Months Ended
                                                                          September 30,                       September 30,
                                                                     2007              2006              2007              2006
                                                                 ------------      ------------      ------------      ------------
                                                                                                           
Revenues
  Research and development .................................     $  1,609,123      $  2,035,668      $  4,936,258      $  4,888,987
                                                                 ------------      ------------      ------------      ------------
Operating expenses
  Selling, general and administrative ......................          793,045           802,391         2,811,701         3,237,002
  Research and development .................................        2,342,303         2,156,473         7,193,191         6,245,640
  Patent preparation fees ..................................           58,637            36,304           323,433           258,751
                                                                 ------------      ------------      ------------      ------------
   Total operating expenses ................................        3,193,985         2,995,168        10,328,325         9,741,393
                                                                 ------------      ------------      ------------      ------------

   Operating loss ..........................................       (1,584,862)         (959,500)       (5,392,067)       (4,852,406)

Increase (decrease) in fair market value of common
  stock rights and common stock warrants ...................         (998,074)          350,790           (32,198)         (721,062)
Other income (loss), net ...................................           89,640           (48,088)          316,040           (73,941)
                                                                 ------------      ------------      ------------      ------------
   Net loss ................................................     $ (2,493,296)     $   (656,798)     $ (5,108,225)     $ (5,647,409)
                                                                 ============      ============      ============      ============

Weighted average shares outstanding: basic and diluted .....       33,519,119        27,656,368        33,140,524        27,219,221
                                                                 ============      ============      ============      ============
Net loss per share: basic and diluted ......................     $      (0.07)     $      (0.02)     $      (0.15)     $      (0.21)
                                                                 ============      ============      ============      ============


   The accompanying notes are an integral part of these financial statements.


                                       3


                             SIGA TECHNOLOGIES, INC.

                CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED)



                                                                                              Nine Months Ended
                                                                                                September 30,
                                                                                          2007                 2006
                                                                                      ------------         -----------
                                                                                                     
Cash flows from operating activities:
Net loss ......................................................................       $ (5,108,225)        $(5,647,409)
Adjustments to reconcile net loss to net
cash used in operating activities:
Depreciation ..................................................................            785,316             530,855
Amortization of intangible assets .............................................            136,325             741,264
Increase in fair market value of rights and warrants ..........................             32,198             721,062
Stock based compensation ......................................................            411,298             340,281
Non-cash consulting expense ...................................................                 --             156,470
Changes in assets and liabilities:
   Accounts receivable ........................................................           (399,841)            770,532
   Prepaid expenses ...........................................................             26,325              28,207
   Other assets ...............................................................            (15,272)            (12,075)
   Accrued interest payable ...................................................                 --              97,822
   Deferred revenue ...........................................................                 --              87,147
   Accounts payable and accrued expenses ......................................           (271,297)           (687,432)
                                                                                      ------------         -----------
   Net cash used in operating activities ......................................         (4,403,173)         (2,873,276)
                                                                                      ------------         -----------

Cash flows from investing activities:
Capital expenditures ..........................................................           (748,830)           (805,375)
                                                                                      ------------         -----------
   Net cash used in investing activities ......................................           (748,830)           (805,375)
                                                                                      ------------         -----------

Cash flows from financing activities:
Proceeds from issuance of notes payable .......................................                 --           3,000,000
Net proceeds from exercise of common stock rights .............................                 --           1,534,500
Net proceeds from exercise of warrants and options ............................          2,708,535             101,985
Repayment of notes payable ....................................................           (130,329)            (80,639)
                                                                                      ------------         -----------
   Net cash provided by financing activities ..................................          2,578,206           4,555,846
                                                                                      ------------         -----------
Net (decrease) increase in cash and cash equivalents ..........................         (2,573,797)            877,195
Cash and cash equivalents at beginning of period ..............................         10,639,530           1,772,489
                                                                                      ------------         -----------
Cash and cash equivalents at end of period ....................................       $  8,065,733         $ 2,649,684
                                                                                      ============         ===========


   The accompanying notes are an integral part of these financial statements.


                                       4


                             SIGA TECHNOLOGIES, INC.
  Notes to the September 30, 2007 Consolidated Financial Statements (Unaudited)

1.    Basis of Presentation

SIGA  Technologies,  Inc.  ("SIGA" or the  "Company") is a  bio-defense  company
engaged in the discovery,  development and commercialization of products for use
in defense against  biological warfare agents such as smallpox and Arenaviruses.
The Company is also  engaged in the  discovery  and  development  of other novel
anti-infectives,  and  antibiotics  for the  prevention and treatment of serious
infectious  diseases.  The Company's anti-viral programs are designed to prevent
or limit the replication of viral  pathogens.  SIGA's  anti-infectives  programs
target the increasingly  serious problem of drug resistant bacteria and emerging
pathogens.

The  consolidated  financial  statements  of the Company  have been  prepared in
accordance with accounting principles generally accepted in the United States of
America for interim  financial  information and the rules and regulations of the
Securities and Exchange  Commission  (the "SEC") for quarterly  reports on Forms
10-Q and should be read in conjunction with the Company's  consolidated  audited
financial  statements  and notes  thereto for the year ended  December 31, 2006,
included in the 2006 Form 10-K. All terms used but not defined  elsewhere herein
have the meaning  ascribed to them in the  Company's  2006 annual report on Form
10-K filed on March 16, 2007. The year-end consolidated  condensed balance sheet
data was derived from  audited  financial  statements,  but does not include all
disclosures  required by accounting  principles generally accepted in the United
States of America. In the opinion of management,  all adjustments (consisting of
normal and recurring  adjustments)  considered necessary for a fair statement of
the results of the interim periods presented have been included.  The results of
operations  for the three  and nine  months  ended  September  30,  2007 are not
necessarily indicative of the results expected for the full year.

The accompanying consolidated financial statements have been prepared on a basis
which  assumes  that the  Company  will  continue  as a going  concern and which
contemplates  the realization of assets and the  satisfaction of liabilities and
commitments  in  the  normal  course  of  business.  The  Company  has  incurred
cumulative net losses and expects to incur additional  losses to perform further
research  and  development  activities.  The  Company  does not have  commercial
products and has limited capital  resources.  Management's  plans with regard to
these matters include  continued  development of its products as well as seeking
additional  research support funds and future financial  arrangements.  Although
management  will continue to pursue these plans,  there is no assurance that the
Company  will  be  successful  in  obtaining   sufficient  future  financing  on
commercially reasonable terms or that the Company will be able to secure funding
from  anticipated  government  contracts  and grants.  Management  believes that
existing cash balances  combined with  anticipated cash flows will be sufficient
to support  its  operations  beyond the next  twelve  months,  and will fund the
Company's business objectives during that period.

2.    Significant Accounting Policies

Use of Estimates

The consolidated  financial  statements and related  disclosures are prepared in
conformity with accounting principles generally accepted in the United States of
America.  Management is required to make estimates and  assumptions  that affect
the reported  amounts of assets and  liabilities,  the  disclosure of contingent
assets and  liabilities at the date of the financial  statements and revenue and
expenses during the period reported.  These estimates include the realization of
deferred tax assets,  useful  lives and  impairment  of tangible and  intangible
assets and goodwill,  and the value of options and warrants granted or issued by
the Company. Estimates and assumptions are reviewed periodically and the effects
of revisions are  reflected in the  financial  statements in the period they are
determined to be necessary. Actual results could differ from these estimates.

Cash and cash equivalents

Cash and cash equivalents consist of short term, highly liquid investments, with
original  maturities of less than three months when  purchased and are stated at
cost. Interest is accrued as earned.

Property, Plant and Equipment

Property, plant and equipment are stated at cost less accumulated  depreciation.
Depreciation is provided on the  straight-line  method over the estimated useful
lives of the various asset classes.  Estimated  lives are 5 years for laboratory
equipment;  3 years for computer equipment;  7 years for furniture and fixtures;
and the life of the lease for leasehold improvements.  Maintenance,  repairs and
minor  replacements  are  charged to expense as  incurred.  Upon  retirement  or
disposal of assets,  the cost and related  accumulated  depreciation are removed
from the Balance  Sheet and any gain or loss is  reflected  in the  Statement of
Operations.


                                       5


Revenue Recognition

The Company  recognizes  revenue  from  contract  research and  development  and
research  payments in  accordance  with SEC Staff  Accounting  Bulletin No. 104,
Revenue  Recognition,  ("SAB  104").  In  accordance  with SAB 104,  revenue  is
recognized  when  persuasive  evidence of an  arrangement  exists,  delivery has
occurred,  the  fee is  fixed  or  determinable,  collectibility  is  reasonably
assured,  contractual obligations have been satisfied and title and risk of loss
have been  transferred  to the  customer.  The Company  recognizes  revenue from
non-refundable  up-front payments,  not tied to achieving a specific performance
milestone, over the period which the Company is obligated to perform services or
based on the percentage of costs incurred to date,  estimated  costs to complete
and total expected  contract  revenue.  Payments for development  activities are
recognized as revenue as earned, over the period of effort.  Substantive at-risk
milestone  payments,  which  are  based  on  achieving  a  specific  performance
milestone,  are  recognized  as revenue  when the  milestone is achieved and the
related  payment  is  due,  providing  there  is no  future  service  obligation
associated with that milestone. In situations where the Company receives payment
in advance of the  performance  of  services,  such  amounts  are  deferred  and
recognized as revenue as the related services are performed.

For the nine months ended  September  30, 2007 and 2006,  revenues from National
Institutes of Health ("NIH")  contracts and Small Business  Innovation  Research
("SBIR") grants were 65% and 51%, respectively,  of total revenues recognized by
the Company.  Revenues from contracts with the United States Army and the United
States Air Force for the nine months ended  September 30, 2007 and 2006 were 35%
and 49%, respectively.

Accounts Receivable

Accounts  receivable  are recorded net of provisions for doubtful  accounts.  An
allowance  for  doubtful   accounts  is  based  on  specific   analysis  of  the
receivables.  At September  30, 2007 and  December 31, 2006,  the Company had no
allowance for doubtful accounts.

Research and development

Research and  development  expenses  include costs directly  attributable to the
conduct of research and development programs,  including employee related costs,
materials, supplies,  depreciation on and maintenance of research equipment, the
cost of services  provided by outside  contractors,  and facility costs, such as
rent,  utilities,  and  general  support  services.  All costs  associated  with
research  and  development  are  expensed  as  incurred.  Costs  related  to the
acquisition  of  technology  rights,  for  which  development  work is  still in
process, and that have no alternative future uses, are expensed as incurred.

Goodwill

Goodwill is recorded when the purchase price paid for an acquisition exceeds the
estimated  fair  value of the net  identified  tangible  and  intangible  assets
acquired.

The Company evaluates goodwill for impairment annually, in the fourth quarter of
each year.  In addition,  the Company  would test  goodwill  for  recoverability
between annual evaluations whenever events or changes in circumstances  indicate
that the carrying amounts may not be recoverable.  Examples of such events could
include a  significant  adverse  change in legal  matters,  liquidity  or in the
business  climate,  an adverse action or assessment by a regulator or government
organization,  loss of key personnel,  or new circumstances  that would cause an
expectation  that it is more  likely  than not that we would  sell or  otherwise
dispose of a reporting unit.  Goodwill impairment is determined using a two-step
approach in accordance with Statement of Financial  Accounting Standards No. 142
"Goodwill and Other  Intangible  Assets"  ("SFAS 142").  The  impairment  review
process  compares the fair value of the reporting unit in which goodwill resides
to its carrying  value.  In 2006,  the Company  operated as one business and one
reporting unit. Therefore, the goodwill impairment analysis was performed on the
basis of the Company as a whole using the market  capitalization  of the Company
as an estimate of its fair value.

Identified Intangible Assets

In  accordance  with  Statement  of  Financial   Accounting  Standards  No.  144
"Accounting  for the Impairment or Disposal of Long-Lived  Assets" ("SFAS 144"),
the Company performs a review of its identified  intangible  assets to determine
if facts and circumstances  exist which indicate that the useful life is shorter
than  originally  estimated  or that the  carrying  amount of assets  may not be
recoverable.  If such facts and circumstances do exist, the Company assesses the
recoverability  of  identified  intangible  assets by  comparing  the  projected
undiscounted net cash flows associated with the related asset or group of assets
over  their  remaining  lives  against  their   respective   carrying   amounts.
Impairment,  if any, is based on the excess of the carrying amount over the fair
value of those assets.  Our  estimates of projected  cash flows are dependent on
many factors, including general economic trends,  technological developments and
projected future contracts and government  grants.  It is reasonably likely that
future cash flows associated with our intangible assets may exceed or fall short
of our  current  projections,  in which case a different  amount for  impairment
would result.


                                       6


Income taxes

Income taxes are accounted for under the asset and liability  method  prescribed
by Statement of Financial  Accounting  Standards No. 109, "Accounting for Income
Taxes."  Deferred  income taxes are recorded for temporary  differences  between
financial   statement   carrying  amounts  and  the  tax  basis  of  assets  and
liabilities.  Deferred tax assets and liabilities reflect the tax rates expected
to be in effect for the years in which the  differences are expected to reverse.
A valuation allowance is provided if it is more likely than not that some or the
entire deferred tax asset will not be realized.

Net income per common share

The Company  computes,  presents and discloses  earnings per share in accordance
with SFAS 128 "Earnings  Per Share"  ("EPS")  which  specifies the  computation,
presentation and disclosure requirements for earnings per share of entities with
publicly held common stock or potential common stock. The statement  defines two
earnings per share calculations,  basic and diluted.  The objective of basic EPS
is to measure the performance of an entity over the reporting period by dividing
income  (loss) by the weighted  average  shares  outstanding.  The  objective of
diluted  EPS is  consistent  with  that of basic  EPS,  that is to  measure  the
performance of an entity over the reporting  period,  while giving effect to all
dilutive  potential common shares that were outstanding  during the period.  The
calculation  of diluted  EPS is similar to basic EPS except the  denominator  is
increased for the conversion of potential common shares.

The Company  incurred  losses for the three and nine months ended  September 30,
2007 and 2006 and as a result,  certain equity instruments are excluded from the
calculation  of  diluted  loss per  share.  At  September  30,  2007  and  2006,
outstanding options to purchase 8,205,003 and 8,482,227 shares, respectively, of
the Company's common stock with exercise prices ranging from $0.94 to $5.50 have
been  excluded  from the  computation  of  diluted  loss  per  share as they are
anti-dilutive.  At September 30, 2007 and 2006, outstanding warrants to purchase
8,415,865 and 9,985,896,  shares,  respectively,  of the Company's common stock,
with  exercise  prices  ranging from $1.18 to $4.99 have been  excluded from the
computation  of diluted loss per share as they are  anti-dilutive.  At September
30, 2006,  68,038 shares of the Company's  Series A convertible  preferred stock
have been excluded from the  computation  of diluted loss per share as they were
anti-dilutive.  These shares were converted into shares of the Company's  common
stock in 2006.

Fair value of financial instruments

The carrying value of cash and cash  equivalents,  accounts  payable and accrued
expenses  approximates  fair value due to the relatively short maturity of these
instruments.  Common stock rights and warrants which are classified as assets or
liabilities  under the  provisions  of EITF  00-19,  are  recorded at their fair
market value as of each reporting period.

Concentration of credit risk

The Company has cash in bank accounts that exceed the Federal Deposit  Insurance
Corporation  insured  limits.  The Company has not experienced any losses on its
cash  accounts.  No allowance  has been  provided for  potential  credit  losses
because management believes that any such losses would be minimal.

Share-based Compensation

The  Company  accounts  for its  stock-based  compensation  programs  under  the
provisions  of  Statement  of Financial  Accounting  Standards  No. 123 (revised
2004), "Share-Based Payment" ("SFAS 123(R)"), which requires the measurement and
recognition of compensation  expense for all share-based  payment awards made to
employees  and directors  including  employee  stock options and employee  stock
purchases   related  to  the  Employee  Stock  Purchase  Plan  ("employee  stock
purchases")  based on estimated  fair values.  The Company does not have a stock
purchase plan at the current time.

Segment information

The Company is managed  and  operated as one  business.  The entire  business is
managed by a single management team that reports to the chief executive officer.
The Company  does not operate  separate  lines of business or separate  business
entities with respect to any of its product candidates. Accordingly, the Company
does not prepare discrete financial information with respect to separate product
areas or by location and only has one reportable  segment as defined by SFAS No.
131, "Disclosures about Segments of an Enterprise and Related Information".

Recent accounting pronouncements

Effective  January 1, 2007,  the Company  adopted  FASB  Interpretation  No. 48,
Accounting for Uncertainty in Income Taxes--an  Interpretation of FASB Statement
109 ("FIN 48"). FIN 48 prescribes a comprehensive  model for the manner in which
a company  should  recognize,  measure,  present and  disclose in its  financial
statements  all material  uncertain tax positions  that the Company has taken or
expects to take on a tax return.


                                       7


As of the  date  of  adoption,  there  were no tax  positions  for  which  it is
reasonably  possible  that the total amounts of  unrecognized  tax benefits will
significantly  increase  or  decrease  within  twelve  months  from  the date of
adoption of FIN 48 or from  September 30, 2007.  As of September  30, 2007,  the
only tax jurisdiction to which the Company is subject is the United States. Open
tax years relate to years in which unused net operating  losses were  generated.
Thus, upon adoption of FIN 48, the Company's open tax years extend back to 1995.
In the event that the Company  concludes  that it is subject to interest  and/or
penalties  arising  from  uncertain  tax  positions,  the Company  will  present
interest and penalties as a component of income taxes. No amounts of interest or
penalties were recognized in the Company's Consolidated Statements of Operations
or  Consolidated  Balance  Sheets  upon  adoption of FIN 48 or as of and for the
three months ended September 30, 2007.

3.    Intangible Assets

Amortization  expense  recorded for the nine months ended September 30, 2007 and
2006 was as follows:

                                                            Nine Months Ended
                                                              September 30,
                                                           2007          2006
                                                        ----------    ----------

Amortization of acquired grants                         $       --    $  654,228
Amortization of customer contract and grants                    --        25,070
Amortization of acquired technology                        136,325        61,966
                                                        ----------    ----------
                                                        $  136,325    $  741,264
                                                        ----------    ----------

4.    Stockholders' Equity

At September 30, 2007,  the  Company's  authorized  share  capital  consisted of
110,000,000  shares,  of which  100,000,000  are  designated  common  shares and
10,000,000 are designated  preferred shares. The Company's Board of Directors is
authorized  to issue  preferred  shares in series with  rights,  privileges  and
qualifications of each series determined by the Board.

2006 Placement

On October 19, 2006, the Company sold 2,000,000  shares of the Company's  common
stock at $4.54  per share  and  warrants  to  purchase  1,000,000  shares of the
Company's common stock. The warrants have an initial exercise price of $4.99 per
share  and may be  exercised  at any  time  and from  time to time  through  and
including the seventh anniversary of the closing date. As of September 30, 2007,
warrants to acquire 1,000,000 shares of common stock were outstanding.

The Company  accounted for the  transaction  under the  provisions of EITF 00-19
which requires that free standing derivative financial  instruments that require
net cash  settlement be classified as assets or  liabilities  at the time of the
transaction, and recorded at their fair value. EITF 00-19 also requires that any
changes in the fair value of the derivative  instruments be reported in earnings
or  loss as long  as the  derivative  contracts  are  classified  as  assets  or
liabilities.  At September  30, 2007,  the fair market value of the warrants was
$2.3 million.  The Company applied the Black-Scholes model to calculate the fair
values of the respective derivative instruments using the contracted term of the
warrants.  Management  estimates the expected  volatility using a combination of
the Company's historical  volatility and the volatility of a group of comparable
companies.  SIGA recorded a gain of $73,000 for the decline in the  instruments'
fair value from December 31, 2006 to September 30, 2007.

2005 Placement

In November  2005,  the Company sold  2,000,000  shares of the Company's  common
stock at $1.00  per share  and  warrants  to  purchase  1,000,000  shares of the
Company's  common stock at an initial  exercise price of $1.18 per share, at any
time and from time to time through and including the seventh  anniversary of the
closing date. As of September 30, 2007,  warrants to acquire  725,000  shares of
common stock were outstanding.

The Company accounted for the transaction under the provisions of EITF 00-19. At
September  30, 2007,  the fair market  value of the  warrants to acquire  common
stock was $2.4 million. SIGA recorded a loss of $105,000 for the increase in the
instruments' fair value from December 31, 2006 to September 30, 2007.


                                       8


5.    Related Parties

During the nine months ended  September 30, 2007, the Company  incurred costs of
$52,000  related to work performed by TransTech  Pharma,  Inc., a related party,
and its affiliates. There are no outstanding accounts payable to related parties
as of September 30, 2007.

6.    Stock Compensation Plans

In January 1996, the Company  implemented  its 1996 Incentive and  Non-Qualified
Stock Option Plan (the "Plan"). The Plan as amended provides for the granting of
up to 11,000,000 shares of the Company's common stock to employees,  consultants
and outside  directors of the Company.  The exercise  period for options granted
under the Plan,  except those granted to outside  directors,  is determined by a
committee of the Board of Directors.  Stock options granted to outside directors
pursuant  to the Plan must have an  exercise  price equal to or in excess of the
fair market value of the Company's common stock at the date of grant.

For the nine months  ended  September  30, 2007 and 2006,  the Company  recorded
compensation  expense of  approximately  $411,000  and  $340,000,  respectively,
related  to  employees  and  directors  stock  options.  The total fair value of
options  vested  during the nine months  ended  September  30, 2007 and 2006 was
$201,000 and $503,000. The total compensation cost not yet recognized related to
non-vested  awards at September 30, 2007 is $1.2 million.  The weighted  average
period over which total  compensation  cost is expected to be  recognized is 1.9
years.

On May 30, 2007, at the Company's 2007 annual shareholders' meeting, the Company
awarded  its  non-employee  directors a total of 105,000  fully-vested  options,
exercisable  at $3.73 per share.  During the three  months ended  September  30,
2007, the Company awarded its employees options to acquire 830,000 shares of the
Company's  common  stock at an  exercise  price of $3.10 per  share.  Options to
purchase 530,000 shares vest pro rata on the first, second and third anniversary
of the date of grant,  and options to purchase 300,000 shares will vest upon the
achievement of certain milestones.

7.    Commitments and Contingencies

As of September 30, 2007, our purchase  obligations  are not material.  We lease
certain  facilities  and office space under  operating  leases.  On December 31,
2006,   minimum  future  rental   commitments   under  operating  leases  having
non-cancelable lease terms in excess of one year are as follows:

      Year ended December 31,        Lease obligations

                 2007                   $     144,237
                 2008                         576,948
                 2009                         579,648
                 2010                         466,448
                 2011                         443,748
                                        -------------
      Total                             $   2,211,029
                                        =============


                                       9


Other

On December 20, 2006, PharmAthene,  Inc. ("PharmAthene") filed an action against
the  Company  in the  Court of  Chancery  in the  State of  Delaware,  captioned
PharmAthene, Inc. v. SIGA Technologies, Inc., C.A. No. 2627-N. In its Complaint,
PharmAthene  asks the  Court to  order  the  Company  to  enter  into a  license
agreement  with  PharmAthene  with  respect  to  SIGA-246,  as well  as  issue a
declaration that the Company is obliged to execute such a license agreement, and
award damages  resulting from the Company's  supposed breach of that obligation.
PharmAthene  also alleges that the Company  breached an  obligation to negotiate
such a license  agreement in good faith, as well as seeks damages for promissory
estoppel  and unjust  enrichment  based on  supposed  information,  capital  and
assistance  that  PharmAthene  allegedly  provided  to the  Company  during  the
negotiation  process.  On January 9, 2007, the Company filed a motion to dismiss
the Complaint in its entirety for failure to state a claim upon which relief can
be granted.  Oral argument on the motion to dismiss was held on June 1, 2007 and
the  parties  are  awaiting a  decision  from the Court.  On January  19,  2007,
PharmAthene served on the Company its first request for production of documents.
The  Company  moved to stay  discovery  on January  26, 2007 and this motion was
granted on March 8, 2007.  SIGA  believes  that the claims are without merit and
plans to defend itself vigorously.


                                       10


                             SIGA TECHNOLOGIES, INC.

Item 2. Management's  Discussion and Analysis of Financial Condition and Results
of Operations

      The following  discussion should be read in conjunction with our financial
statements  and  notes to  those  statements  and  other  financial  information
appearing  elsewhere  in  this  Quarterly  Report.  In  addition  to  historical
information,  the following  discussion and other parts of this Quarterly Report
contain forward-looking information that involves risks and uncertainties.

Overview

      Since our  inception in December  1995,  SIGA has pursued the research and
development  of novel  products  for the  prevention  and  treatment  of serious
infectious  diseases,   including  products  for  use  in  the  defense  against
biological  warfare agents such as smallpox and hemorrhagic  Fevers.  During the
third quarter of 2006, we were awarded a 3 year, $16.5 million contract from the
NIH and an additional 3 year, $4.8 million SBIR Phase II continuation grant from
the NIH. Both awards  support the  continuing  development  of our smallpox drug
candidate, ST-246. Our efforts to develop ST-246 were also supported by previous
SBIR grants from the NIH totaling $5.8 million,  a $1.0 million  agreement  with
Saint Louis  University,  and a $1.6 million  contract with the U.S.  Army.  Our
initiative to advance  SIGA's  Hemorrhagic  Fevers  programs is supported by a 3
year,  $6.0  million  SBIR grant from the NIH,  received in  September  2006 and
previous SBIR grants from the NIH totaling $6.3 million.  In September 2007, the
Company  received a two-year SBIR grant for a total of  approximately  $600,000,
supporting   the  Company's   development   of  ST-246   treatment  of  smallpox
vaccine-related adverse events.

      Our anti-viral  programs are designed to prevent or limit the  replication
of  the  viral  pathogen.   Our  anti-infectives   programs  are  aimed  at  the
increasingly serious problem of drug resistance.  These programs are designed to
block the ability of bacteria to attach to human  tissue,  the first step in the
infection  process.  In July 2007,  we were awarded a two-year  SBIR award for a
total of $530,000 to support our Strep program.

      We do not have  commercial  biomedical  products,  and we do not expect to
have such  products for one to three  years,  if at all. We believe that we will
need additional  funds to complete the  development of our biomedical  products.
Our plans with regard to these  matters  include  continued  development  of our
products as well as seeking  additional  research  support  funds and  financial
arrangements.  Although we continue to pursue these plans, there is no assurance
that we will be successful in obtaining  future financing on terms acceptable to
us.  Management  believes it has  sufficient  funds and projected  cash flows to
support operations beyond the next twelve months.

      Our  biotechnology  operations  are  based  in our  research  facility  in
Corvallis,  Oregon.  We continue to seek to fund a major  portion of our ongoing
antiviral,  antibiotic and vaccine  programs through a combination of government
grants,  contracts  and  strategic  alliances.  While  we have  had  success  in
obtaining strategic alliances,  contracts and grants, there is no assurance that
we will continue to be successful in obtaining  funds from these sources.  Until
additional  relationships  are  established,  we  expect  to  continue  to incur
significant  research and development costs as well as costs associated with the
manufacturing of product for use in clinical trials and pre-clinical testing. It
is  expected  that  general  and  administrative  costs,  including  patent  and
regulatory  costs,  necessary  to  support  clinical  trials  and  research  and
development will continue to be significant in the future.

      To date, we have not marketed,  or generated revenues from, the commercial
sale of any products. Our biopharmaceutical  product candidates are not expected
to be  commercially  available for several  years,  if at all.  Accordingly,  we
expect to incur  operating  losses for the foreseeable  future.  There can be no
assurance that we will ever achieve profitable operations.

Critical Accounting Estimates

      The methods,  estimates  and  judgments we use in applying our  accounting
policies have a significant  impact on the results we report in our consolidated
financial statements, which we discuss under the heading "Results of Operations"
following this section of our Management's  Discussion and Analysis. Some of our
accounting policies require us to make difficult and subjective judgments, often
as a result  of the  need to make  estimates  of  matters  that  are  inherently
uncertain.  Our most critical  accounting  estimates  include the  assessment of
recoverability  of goodwill,  which could impact goodwill  impairments,  and the
assessment of  recoverability  of long-lived  assets,  which  primarily  impacts
operating income if impairment exists. Below, we discuss these policies further,
as well as the estimates and judgments


                                       11


involved. Other key accounting policies, including revenue recognition, are less
subjective and involve a far lower degree of estimation and judgment.

Significant Accounting Policies

      The  following is a brief  discussion of the more  significant  accounting
policies and methods used by us in the preparation of our consolidated financial
statements.  Note  2 of  the  Notes  to the  Consolidated  Financial  Statements
includes a summary of all of the significant accounting policies.

      Share-based Compensation

      The Company accounts for its stock-based  compensation  programs under the
provisions  of  Statement  of Financial  Accounting  Standards  No. 123 (revised
2004), "Share-Based Payment" ("SFAS 123(R)"), which requires the measurement and
recognition of compensation  expense for all share-based  payment awards made to
employees  and directors  including  employee  stock options and employee  stock
purchases   related  to  the  Employee  Stock  Purchase  Plan  ("employee  stock
purchases")  based on estimated fair values.  SFAS 123(R) requires  companies to
estimate the fair value of share-based  awards on the grant date using an option
pricing model. The value of the portion of the award that is ultimately expected
to vest is  recorded  as expense  over the  requisite  periods in the  Company's
consolidated statement of operations.

      Fair value of financial instruments

      The  carrying  value of cash and cash  equivalents,  accounts  payable and
accrued expenses approximates fair value due to the relatively short maturity of
these  instruments.  Common stock rights and warrants  which are  classified  as
assets or  liabilities  under the provisions of EITF 00-19 are recorded at their
fair  market  value  as of  each  reporting  period.  The  Company  applies  the
Black-Scholes  pricing model to calculate the fair values of common stock rights
and  warrants  using  the  contracted  term  of  the  instruments  and  expected
volatility  that is  calculated as a  combination  of the  Company's  historical
volatility and the volatility of a group of comparable companies.

      Revenue Recognition

      The Company  recognizes revenue from contract research and development and
research progress payments in accordance with SEC Staff Accounting  Bulletin No.
104,  Revenue  Recognition,  ("SAB 104"). In accordance with SAB 104, revenue is
recognized  when  persuasive  evidence of an  arrangement  exists,  delivery has
occurred,  the fee is  fixed  and  determinable,  collectibility  is  reasonably
assured,  contractual obligations have been satisfied and title and risk of loss
have been  transferred  to the  customer.  The Company  recognizes  revenue from
non-refundable  up-front payments,  not tied to achieving a specific performance
milestone,  over the period  during  which the Company is  obligated  to perform
services or based on the percentage of costs incurred to date,  estimated  costs
to complete  and total  expected  contract  revenue.  Payments  for  development
activities  are  recognized  as revenue  is  earned,  over the period of effort.
Substantive at-risk milestone payments,  which are based on achieving a specific
performance milestone,  are recognized as revenue when the milestone is achieved
and the related payment is due,  providing there is no future service obligation
associated with that milestone. In situations where the Company receives payment
in advance of the  performance  of  services,  such  amounts  are  deferred  and
recognized as revenue as the related services are performed.

      Goodwill

      Goodwill  is  recorded  when the  purchase  price paid for an  acquisition
exceeds the estimated fair value of the net  identified  tangible and intangible
assets acquired.

      The Company  evaluates  goodwill for  impairment  annually,  in the fourth
quarter  of each  year.  In  addition,  the  Company  would  test  goodwill  for
recoverability   between  annual  evaluations  whenever  events  or  changes  in
circumstances  indicate  that  the  carrying  amounts  may  not be  recoverable.
Examples of such events  could  include a  significant  adverse  change in legal
matters,  liquidity or in the business climate,  an adverse action or assessment
by a  regulator  or  government  organization,  loss  of key  personnel,  or new
circumstances  that would cause an  expectation  that it is more likely than not
that we would sell or otherwise dispose of a reporting unit. Goodwill impairment
is  determined  using a  two-step  approach  in  accordance  with  Statement  of
Financial  Accounting  Standards No. 142, "Goodwill and Other Intangible Assets"
("SFAS  142").  The  impairment  review  process  compares the fair value of the
reporting unit in which  goodwill  resides to its carrying  value.  In 2006, the
Company operated as one business and one reporting unit. Therefore, the goodwill
impairment  analysis was  performed on the basis of the Company as a whole using
the market  capitalization  of the Company as an estimate of its fair value.  In
the past,  our market  capitalization  has been  significantly  in excess of the
Company's  carrying  value.  It is  reasonably  likely  that the  future  market
capitalization  of  SIGA  may  exceed  or  fall  short  of  our  current  market
capitalization.  If future  market  capitalization  falls short of the Company's
carrying value, a potential  impairment might result.  The use of the discounted
expected  future cash flows to


                                       12


evaluate  the fair  value of the  Company  as a whole is  reasonably  likely  to
produce different results than the Company's market capitalization.

      Intangible Assets

      In accordance  with  Statement of Financial  Accounting  Standards No. 144
"Accounting  for the Impairment or Disposal of Long-Lived  Assets" ("SFAS 144"),
the Company performs a review of its identified  intangible  assets to determine
if facts and circumstances  exist which indicate that the useful life is shorter
than  originally  estimated  or that the  carrying  amount of assets  may not be
recoverable.  If such facts and circumstances do exist, the Company assesses the
recoverability  of  identified  intangible  assets by  comparing  the  projected
undiscounted net cash flows associated with the related asset or group of assets
over  their  remaining  lives  against  their   respective   carrying   amounts.
Impairment,  if any, is based on the excess of the carrying amount over the fair
value of those assets.  Our  estimates of projected  cash flows are dependent on
many factors, including general economic trends,  technological developments and
projected future contracts and government  grants.  It is reasonably likely that
future cash flows associated with our intangible assets may exceed or fall short
of our  current  projections,  in which case a different  amount for  impairment
would  result.  If our actual  cash flows  exceed our  estimates  of future cash
flows,  any impairment  charge would be greater than needed.  If our actual cash
flows  are  less  than  our  estimated  cash  flows,  we may  need to  recognize
additional  impairment charges in future periods,  which would be limited to the
carrying amount of the intangible assets.

      Recent accounting pronouncements

      Effective January 1, 2007, the Company adopted FASB Interpretation No. 48,
Accounting for Uncertainty in Income Taxes--an  Interpretation of FASB Statement
109 ("FIN 48"). FIN 48 prescribes a comprehensive  model for the manner in which
a company  should  recognize,  measure,  present and  disclose in its  financial
statements  all material  uncertain tax positions  that the Company has taken or
expects to take on a tax return.

As of the  date  of  adoption,  there  were no tax  positions  for  which  it is
reasonably  possible  that the total amounts of  unrecognized  tax benefits will
significantly  increase  or  decrease  within  twelve  months  from  the date of
adoption of FIN 48 or from  September 30, 2007.  As of September  30, 2007,  the
only tax jurisdiction to which the Company is subject is the United States. Open
tax years relate to years in which unused net operating  losses were  generated.
Thus, upon adoption of FIN 48, the Company's open tax years extend back to 1995.
In the event that the Company  concludes  that it is subject to interest  and/or
penalties  arising  from  uncertain  tax  positions,  the Company  will  present
interest and penalties as a component of income taxes. No amounts of interest or
penalties were recognized in the Company's Consolidated Statements of Operations
or  Consolidated  Balance  Sheets  upon  adoption of FIN 48 or as of and for the
three months ended September 30, 2007.

Results of Operations

Three months ended September 30, 2007 and 2006

      Revenues from research and development  contracts and grants for the three
months  ended  September  30, 2007 and 2006 were $1.6  million and 2.0  million,
respectively. For the three months ended September 30, 2007 and 2006 we recorded
$1.1 million and $1.0 million,  respectively,  from an NIH contract and NIH SBIR
grants,  supporting  two of our  lead  programs.  Revenue  recognized  from  our
programs  with the USAF was $480,000 and $1.0 million for the three months ended
September 30, 2007 and 2006, respectively.

      Selling, general and administrative expenses ("SG&A") for the three months
ended  September  30,  2007 and 2006  were  approximately  $800,000  for the two
respective periods.

      Research and development expenses for the three months ended September 30,
2007 and 2006,  were  $2,342,000  and $2,156,000  respectively.  The increase of
$186,000 or 8.6% is due mainly to an increase of $98,000 in employee and related
expenses and an increase of $55,000 in stock based compensation.

      During  the three  months  ended  September  30,  2007 and 2006,  we spent
$605,000  and  $442,000,  respectively,  on the  development  of our  lead  drug
candidate,  ST-246,  an orally  administered  anti-viral  drug that  targets the
smallpox virus. For the three months ended September 30, 2007, we spent $223,000
on internal human  resources and $382,000  mainly on clinical  testing.  For the
three  months ended  September  30, 2006,  we spent  $176,000 on internal  human
resources and $266,000 on pre-clinical  testing of ST-246. From inception of the
ST-246 development  program to-date, we expended a total of $8.7 million related
to the  program,  of which $2.2  million and $6.5 million were spent on internal
human  resources,  and  clinical  and  pre-clinical  work,  respectively.  These
resources  reflect SIGA's research and


                                       13


development  expenses directly related to the program.  They exclude  additional
expenditures such as the cost to acquire the program,  patent costs,  allocation
of indirect expenses,  and the value of other services received from the NIH and
the Department of Defense ("DoD").

      R&D  expenses of  $325,000  and  $326,000  during the three  months  ended
September 30, 2007 and 2006, respectively,  were used to support the development
of  ST-294,  a drug  candidate  which  has  demonstrated  significant  antiviral
activity in cell culture assays against  arenavirus  pathogens,  ST-193,  a drug
candidate  for  Lassa  fever  virus,  and  other  drug  candidates  for  certain
hemorrhagic  fevers.  For the three months ended  September  30, 2007,  we spent
$54,000 on internal human resources and $270,000 mainly on pre-clinical testing.
For the three months ended  September  30, 2006,  we spent  $110,000 on internal
human  resources and $216,000 on  pre-clinical  testing.  From  inception of our
program to develop  ST-294,  ST-193 and other drug  candidates  for  hemorrhagic
fevers,  to-date,  we spent a total of $4.1 million  related to the program,  of
which $1.7 million and $2.4 million were  expended on internal  human  resources
and pre-clinical work, respectively. These resources reflect SIGA's research and
development  expenses directly related to the program.  They exclude  additional
expenditures such as the cost to acquire the program,  patent costs,  allocation
of indirect expenses,  and the value of other services received from the NIH and
the DoD.

      For the three months ended September 30, 2007, R&D expenses related to our
USAF  Agreements  were  $301,000 and $19,000 for internal  human  resources  and
external R&D  services,  respectively.  During the same period in 2006, we spent
$172,000 and $360,000 on internal  human  resources  and external R&D  services,
respectively.  Costs related to our work on the USAF  Agreements  from September
2005 to date were $3.1 million,  of which we spent $1.6 million and $1.5 million
on internal  human  resources  and external R&D  services,  respectively.  These
resources  reflect SIGA's research and development  expenses directly related to
this agreement.  They exclude  additional  expenditures such as patent costs and
allocation of indirect expenses.

      Patent preparation  expenses for the three months ended September 30, 2007
were $59,000  compared to $36,000 for the three months ended September 30, 2006.
We incurred  slightly  higher costs during the 2007 three months period for work
performed in connection with our two lead programs.

      Changes in the fair value of common stock rights and common stock warrants
sold  together  with common stock in October 2006 and November 2005 are recorded
as gains or losses. For the three months ended September 30, 2007, we recorded a
loss of $998,000, reflecting an increase in the fair market value of warrants to
purchase  common  stock.  For the same  period in 2006,  we  recorded  a gain of
$351,000 reflecting a decline in the fair market value of rights and warrants to
purchase common stock.  The warrants and rights to purchase common stock of SIGA
were recorded at fair market value and  classified as liabilities at the time of
the transaction.

      For the three months ended  September 30, 2007 we recorded other income of
$90,000  related to interest  income on our cash and cash  equivalent  balances.
During the three months ended  September 30, 2006, we recorded other expenses of
$48,000 primarily reflecting interest expense on notes payable.

Nine months ended September 30, 2007 and 2006

      Revenues from research and  development  contracts and grants for the nine
months ended  September  30, 2007 and 2006 were  approximately  $4.9 million for
each of the respective periods. For the nine months ended September 30, 2007, we
recorded  $3.2  million  from  NIH SBIR  grants  and an  agreement  with the NIH
supporting  our lead  programs.  Revenues  from NIH SBIR grants and an agreement
with St. Louis  University  supporting  these programs during the same period in
2006 was $2.2 million. Revenue recognized from our programs with the US Army and
the USAF was $1.7 million and $2.4  million for the nine months ended  September
30, 2007 and 2006, respectively.

      SG&A  expenses for the nine months ended  September 30, 2007 and 2006 were
$2.8  million and $3.2  million,  respectively.  Employees'  payroll and related
expenses for the nine months ended September 30, 2007 increased by $169,000 from
the same period in 2006. Higher expenses for the nine months ended September 30,
2006 were mainly due to professional fees incurred in connection with a business
transaction  and a non-cash  consulting  charge.  During the nine  months  ended
September 30, 2006 we recorded  legal,  accounting,  and consulting  expenses of
$752,000,  $164,000,  and $82,000,  respectively,  for due  diligence  services,
fairness opinion and legal advice related to a potential  business  transaction.
During the nine months ended  September  30,  2006,  we also  recorded  $156,000
reflecting  a non-cash  consulting  charge  related to  issuance  of warrants to
consultants.

      Research and  development  expenses were $7,193,000 and $6,246,000 for the
nine months  ended  September  30, 2007 and 2006,  respectively,  an increase of
$947,000 or 15.2% from the nine months ended  September  30, 2006.


                                       14


Expenditures  related  to  clinical  and  pre-clinical  testing of our lead drug
candidates increased $820,000 from the nine months ended September 30, 2006. Our
payroll  expense has increased by $480,000 from the nine months ended  September
30, 2006, reflecting the expansion and change in composition of our research and
development  workforce.  In addition,  depreciation  expense for the nine months
ended September 30, 2007 increased  $253,000 from the same period in 2006. These
increases  were  partially  offset  by a decline  of  $605,000  in  amortization
expense.

      During the nine months ended  September  30, 2007 and 2006,  we spent $2.3
million and $1.6 million,  respectively,  on the development of ST-246.  For the
nine months  ended  September  30,  2007,  we spent  $711,000 on internal  human
resources and $1.6 million mainly on clinical testing. For the nine months ended
September  30, 2006,  we spent  $489,000 on internal  human  resources  and $1.1
million  on  pre-clinical  testing  of  ST-246.  From  inception  of the  ST-246
development  program to-date, we expended a total of $8.7 million related to the
program,  of which $2.2 million and $6.5  million  were spent on internal  human
resources,  and clinical and pre-clinical  work,  respectively.  These resources
reflect  SIGA's  research  and  development  expenses  directly  related  to the
program.  They exclude  additional  expenditures such as the cost to acquire the
program,  patent costs,  allocation of indirect expenses, and the value of other
services received from the NIH and the DoD.

      R&D  expenses  of  $916,000  and  $769,000  during the nine  months  ended
September 30, 2007 and 2006, respectively,  were used to support the development
of  ST-294,  a drug  candidate  which  has  demonstrated  significant  antiviral
activity in cell culture assays against certain arenavirus pathogens,  ST-193, a
drug candidate for Lassa fever virus,  and other drug candidates for hemorrhagic
fevers.  For the nine months  ended  September  30, 2007,  we spent  $175,000 on
internal human resources and $741,000 mainly on  pre-clinical  testing.  For the
nine months  ended  September  30,  2006,  we spent  $456,000 on internal  human
resources and $313,000 on pre-clinical  testing of ST-294. From inception of our
program to develop  ST-294,  ST-193,  and other drug  candidates for hemorrhagic
fevers,  to-date,  we spent a total of $4.1 million  related to the program,  of
which $1.7 million and $2.3 million were  expended on internal  human  resources
and pre-clinical work, respectively. These resources reflect SIGA's research and
development  expenses directly related to the program.  They exclude  additional
expenditures such as the cost to acquire the program,  patent costs,  allocation
of indirect expenses,  and the value of other services received from the NIH and
the DoD.

      For the nine months ended September 30, 2007, R&D expenses  related to our
USAF  Agreements  were  $818,000 and $346,000 for internal  human  resources and
external R&D  services,  respectively.  During the same period in 2006, we spent
$584,000 and $653,000 on internal  human  resources  and external R&D  services,
respectively.  Costs related to our work on the USAF  Agreements  from September
2005 to date were $3.1 million,  of which we spent $1.6 million and $1.5 million
on internal  human  resources  and external R&D  services,  respectively.  These
resources  reflect SIGA's research and development  expenses directly related to
this agreement.  They exclude  additional  expenditures such as patent costs and
allocation of indirect expenses.

      Our product programs are in the early stage of development.  At this stage
of development,  we cannot make  reasonable  estimates of the potential cost for
most of our  programs to be  completed  or the time it will take to complete the
project.  Our lead product,  ST-246, is an orally  administered  anti-viral drug
that  targets the  smallpox  virus.  In December  2005 the FDA  accepted our IND
application for ST-246 and granted it Fast-Track  status.  In December 2006, the
FDA granted Orphan Drug designation to ST-246, for the prevention as well as the
treatment  of  smallpox.  We expect  that costs to  complete  the  program  will
approximate $15 million to $20 million,  and that the project could be completed
in 24  months  to 36  months.  There  is a high  risk of  non-completion  of any
program,  including ST-246,  because of the lead time to program  completion and
uncertainty of the costs. Net cash inflows from any products  developed from our
programs  is at least  one to  three  years  away.  However,  we  could  receive
additional  grants,  contracts or  technology  licenses in the  short-term.  The
potential  cash and  timing is not known and we cannot be  certain  if they will
ever occur.

      The risk of failure to complete any program is high,  as each,  other than
our smallpox program which began 21 days dose-escalating  studies in 2007, is in
the relatively early stage of development.  Products for the biological  warfare
defense market, such as the ST-246 smallpox anti-viral,  could generate revenues
in one to three years.  We believe the products  directed toward this market are
on  schedule.  We  expect  the  future  research  and  development  cost  of our
biological  warfare defense programs to increase as the potential products enter
animal studies and safety  testing,  including  human safety  trials.  Funds for
future  development will be partially paid for by NIH contracts and SBIR grants,
additional  government  funding and from future  financing.  If we are unable to
obtain  additional  federal  grants and  contracts  or  funding in the  required
amounts,  the development  timeline for these products would slow or possibly be
suspended.  Delay or  suspension  of any of our  programs  could have an adverse
impact on our ability to raise funds in the  future,  enter into  collaborations
with corporate  partners or obtain additional  federal funding from contracts or
grants.


                                       15


      Patent  preparation  expenses for the nine months ended September 30, 2007
were $323,000 compared to $259,000 for the nine months ended September 30, 2006.
The increase of $64,000 or 25% reflects  additional work performed in connection
with our two lead programs.

      Changes in the fair value of common stock rights and common stock warrants
sold  together  with common stock in October 2006 and November 2005 are recorded
as gains or losses.  For the nine months  ended  September  30, 2007 and 2006 we
recorded a loss of $32,000 and $721,000, respectively, reflecting an increase in
the fair market value of warrants to purchase common stock during the respective
nine months  periods.  The warrants and rights to purchase  common stock of SIGA
were recorded at fair market value and  classified as liabilities at the time of
the transaction.

      For the nine months ended  September  30, 2007 and 2006 we recorded  other
income of  $316,000  and  other  loss of  $74,000,  respectively.  Other  income
reflects interest income on our net cash balance for the nine months. Other loss
for the nine months ended September 30, 2006 mainly reflects interest expense on
notes payable.

Liquidity and Capital Resources

      On September 30, 2007,  we had $8.1 million in cash and cash  equivalents.
During the nine months ended  September  30,  2007,  we received net proceeds of
$2.7  million from  exercises of warrants and options to purchase  shares of the
Company's Common stock.

      We believe that our existing cash combined  with  anticipated  cash flows,
including receipt of future funding from government contracts and grants will be
sufficient to support our  operations  beyond the next twelve  months,  and that
sufficient cash flows will be available to meet our business  objectives  during
that period.

      Operating activities

      Net cash used in  operations  during the nine months ended  September  30,
2007 was $4.4 million  compared to $2.9 million in 2006.  During the nine months
ended September 30, 2007, our account  receivable  balance  increased  $400,000,
compared  with a decline of  $771,000  of  accounts  receivable  during the same
period  in 2006 as a result  of  collection  of  accounts  receivable  that were
outstanding  at  December  31,  2005.  We also used  additional  cash to support
clinical  and  pre-clinical  testing of our leading  programs and to support the
increase in our R&D payroll expenses.

      Investing activities

      Capital  expenditures  during the nine months ended September 30, 2007 and
2006  were  $749,000  and  $805,000,  respectively,  and  mainly  supported  the
renovation  of our  office  space in  Oregon in 2007 and the  renovation  of our
research facility in Oregon during the same period in 2006.

      Financing activities

      Cash  provided  by  financing  activities  during  the nine  months  ended
September 30, 2007 was $2.6 million,  generated mainly from exercises of options
and warrants to purchase  common stock.  During the nine months ended  September
30, 2006,  we received  $3.0 million under three notes payable that were paid in
full in October 2006, and $1.6 million from  exercises of warrants,  options and
rights to purchase common stock.

      We have  incurred  cumulative  net losses  and expect to incur  additional
losses to perform further  research and development  activities.  We do not have
commercial products and have limited capital resources. Our plans with regard to
these matters include  continued  development of our products as well as seeking
additional  working capital through a combination of  collaborative  agreements,
strategic  alliances,  research grants,  equity and debt financing.  Although we
continue to pursue these plans, there is no assurance that we will be successful
in obtaining future financing on commercially reasonable terms.

      Our working  capital and capital  requirements  will depend upon  numerous
factors,   including   pharmaceutical   research   and   development   programs;
pre-clinical  and  clinical  testing;  timing and cost of  obtaining  regulatory
approvals;   levels  of  resources   that  we  devote  to  the   development  of
manufacturing  and marketing  capabilities;  technological  advances;  status of
competitors;  and our ability to establish collaborative arrangements with other
organizations.

Off-Balance Sheet Arrangements

      SIGA does not have any off-balance sheet arrangements.


                                       16


Safe Harbor Statement

      This  report  contains  certain  "forward-looking  statements"  within the
meaning of the Private  Securities  Litigation  Reform Act of 1995,  as amended,
including statements regarding the efficacy of potential products, the timelines
for bringing such products to market and the availability of funding sources for
continued development of such products.  Forward-looking statements are based on
management's  estimates,   assumptions  and  projections,  and  are  subject  to
uncertainties,  many of which are beyond the control of SIGA. Actual results may
differ  materially  from those  anticipated  in any  forward-looking  statement.
Factors  that may cause such  differences  include the risks that (a)  potential
products that appear promising to SIGA or its  collaborators  cannot be shown to
be efficacious or safe in subsequent  pre-clinical or clinical trials,  (b) SIGA
or its  collaborators  will not obtain  appropriate  or  necessary  governmental
approvals to market these or other potential products,  (c) SIGA may not be able
to obtain  anticipated  funding for its  development  projects  or other  needed
funding, (d) SIGA may not be able to secure funding from anticipated  government
contracts  and  grants,  (e) SIGA may not be able to secure or enforce  adequate
legal  protection,  including  patent  protection,  for  its  products  and  (f)
unanticipated   internal  control  deficiencies  or  weaknesses  or  ineffective
disclosure  controls and procedures.  More detailed  information  about SIGA and
risk  factors that may affect the  realization  of  forward-looking  statements,
including the forward-looking  statements in this presentation,  is set forth in
SIGA's  filings with the Securities and Exchange  Commission,  including  SIGA's
Annual Report on Form 10-K for the fiscal year ended  December 31, 2006,  and in
other  documents that SIGA has filed with the  Commission.  SIGA urges investors
and security  holders to read those documents free of charge at the Commission's
Web  site at  http://www.sec.gov.  Interested  parties  may  also  obtain  those
documents free of charge from SIGA.  Forward-looking statements speak only as of
the date they are made,  and except for our ongoing  obligations  under the U.S.
federal  securities  laws,  we undertake no  obligation  to publicly  update any
forward-looking statements whether as a result of new information, future events
or otherwise.


                                       17


Item 3. Quantitative and Qualitative Disclosure About Market Risk

      None

Item 4. Controls and Procedures

      (a) Disclosure Controls and Procedures. The Company's management, with the
participation  of the  Company's  Chief  Financial  Officer,  has  evaluated the
effectiveness of the Company's disclosure controls and procedures (as defined in
Rules  13a-15(e)  and  15d-15(e)  under the  Exchange  Act) as of the end of the
fiscal period  covered by this  Quarterly  Report on Form 10-Q.  Based upon such
evaluation,  the Chief  Executive  Officer  and  Chief  Financial  Officer  have
concluded that, as of the end of such period, the Company's  disclosure controls
and procedures are effective.

      (b) Internal  Control Over  Financial  Reporting.  There have not been any
changes in the Company's internal control over financial reporting (as such term
is defined in Rules  13a-15(f) and 15d-15(f)  under the Exchange Act) during the
fiscal period covered by this Quarterly Report on Form 10-Q that have materially
affected,  or are reasonably likely to materially affect, the Company's internal
control over financial reporting.


                                       18


                                     Part II
                                Other information

Item 1.  On December 20, 2006, PharmAthene, Inc. ("PharmAthene") filed an action
         against the Company in the Court of Chancery in the State of  Delaware,
         captioned  PharmAthene,  Inc.  v. SIGA  Technologies,  Inc.,  C.A.  No.
         2627-N.  In its  Complaint,  PharmAthene  asks the  Court to order  the
         Company to enter into a license agreement with PharmAthene with respect
         to SIGA-246, as well as issue a declaration that the Company is obliged
         to execute such a license  agreement,  and award damages resulting from
         the Company's  supposed  breach of that  obligation.  PharmAthene  also
         alleges that the Company  breached an  obligation  to negotiate  such a
         license  agreement  in  good  faith,  as  well  as  seeks  damages  for
         promissory   estoppel   and  unjust   enrichment   based  on   supposed
         information, capital and assistance that PharmAthene allegedly provided
         to the Company during the negotiation  process. On January 9, 2007, the
         Company  filed a motion to dismiss the  Complaint  in its  entirety for
         failure  to  state a claim  upon  which  relief  can be  granted.  Oral
         argument  on the  motion  to  dismiss  was held on June 1, 2007 and the
         parties are  awaiting a decision  from the Court.  On January 19, 2007,
         PharmAthene  served on the Company its first request for  production of
         documents.  The Company moved to stay discovery on January 26, 2007 and
         this motion was granted on March 8, 2007. SIGA believes that the claims
         are without merit and plans to defend itself vigorously.

Item 1A. Risk Factors - There were no material changes to Risk Factors disclosed
         in SIGA's 2006 Form 10-K.

Item 2.  Unregistered Sale of Equity Securities and Use of Proceeds - None.

Item 3.  Defaults upon Senior Securities - None.

Item 4.  Submission of Matters to a Vote of Security Holders

      (a)   The Company held a special meeting of Stockholders on July 26, 2007.

      (b)   Proxies for the meeting were solicited pursuant to Regulation 14A of
            the Securities Exchange Act of 1934, as amended.

      (c)   Briefly  described  below is each  matter  voted  upon at the annual
            meeting of Stockholders.

            (1)   Approval of an amendment to the  certificate of  incorporation
                  to increase the authorized  common stock by 50,000,000  shares
                  to  100,000,000  shares of common  stock.

                  Total common stock voted was 26,752,344 in favor, 1,173,181
                  against, 157,461 abstained.

Item 5.  Other Information - None.

Item 6.  Exhibits

     *   31.1   Certification of Chief Executive Officer Pursuant to Section 302
                of the Sarbanes-Oxley Act of 2002.

     *   31.2   Certification of Chief Financial Officer Pursuant to Section 302
                of the Sarbanes-Oxley Act of 2002.

     *   32.1   Certification of Chief Executive Officer Pursuant to Section 906
                of the Sarbanes-Oxley Act of 2002.

     *   32.2   Certification of Chief Financial Officer Pursuant to Section 906
                of the Sarbanes-Oxley Act of 2002.

         * Filed herein


                                       19


                                   SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.

                                                  SIGA Technologies, Inc.
                                                  (Registrant)


         Date: November 13, 2007                  By:/s/ Thomas N. Konatich
                                                    ---------------------------

                                                  Thomas N. Konatich
                                                  Chief Financial Officer


                                       20