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

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                          (Amendment No.           )*

                             NetScout Systems, Inc.
                         -----------------------------
                               (Name of Issuer)

                           Common Stock PAR USD .001
                         -----------------------------
                         (Title of Class of Securities)

                                   64115T104
                         -----------------------------
                                 (CUSIP Number)

                                    8/31/02
            -------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)

         Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

                                [x] Rule 13d-1(b)

                                [ ] Rule 13d-1(c)

                                [ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequentamendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



CUSIP No. 64115T104                  SCHEDULE 13G              Page 2 of 7 Pages

(1)      Names of Reporting Persons.
         I.R.S. Identification Nos. of above persons (entities only).

         Atlantic Trust Company, N.A.
         04-2986713

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(2)      Check the Appropriate Box if a Member of a Group (See Instructions)
                                                                      (a)   [ ]
                                                                      (b)   [ ]

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(3)      SEC Use Only

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(4)      Citizenship or Place of Organization

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

         Atlantic Trust Company, N.A. is a limited purpose, national chartered
         trust company, regulated by the Office of the Comptroller of the
         Currency

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                  (5)       Sole Voting Power
                            1,003,000

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

 Number of        (6)       Voting Power
  Shares                    10,548,382
Beneficially
 Owned by         --------------------------------------------------------------
   Each
 Reporting        (7)       Sole Dispositive Power
Person With                 1,003,000

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

                  (8)       Shared Dispositive Power
                            10,548,382
                  --------------------------------------------------------------

(9)      Aggregate Amount Beneficially Owned by Each Reporting Person
         11,551,382 shares

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(10)     Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)                                              NO  [ ]

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(11)     Percent of Class Represented by Amount in Row (9)
         38.7%

         -----------------------------------------------------------------------
(12)     Type of Reporting Person (See Instructions)
         BK

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



CUSIP No. 64115T104

Item 1(a)         Name of Issuer

                  NetScout Systems, Inc.

Item 1(b)         Address of Issuer's Principal Executive Offices

                  310 Littleton Road
                  Westford, MA  01886
                  United States

Item 2(a)         Name of Person Filing

                  Atlantic Trust Company, N.A.

Item 2(b)         Address of Principal Business Office or, if none, Residence

                  100 Federal Street, Floor 37, Boston, MA 02110-1802

Item 2(c)         Citizenship

                  Atlantic Trust Company, N.A. is a limited purpose,
                  national chartered trust company, regulated by the
                  Office of the Comptroller of the Currency

Item 2(d)         Title of Class of Securities

                  Common Stock PAR USD .001

Item 2(e)         CUSIP Number

                  64115T104

                               Page 3 of 7 Pages



CUSIP No. 64115T104

Item 3            If this statement is filed pursuant to 240.13d-1(b) or 240.13d
                  -2(b) or (c), check whether the person filing is a:

                  (a)       [ ]

                            Broker or dealer registered under section 15 of the
                            Act (15 U.S.C. 78o).

                  (b)       [x]

                            Bank as defined in section 3(a)(6) of the Act (15
                            U.S.C. 78c).

                  (c)       [ ]

                            Insurance company as defined in section 3(a)(19) of
                            the Act (15 U.S.C. 78c).

                  (d)       [ ]

                            Investment company registered under section 8 of the
                            Investment Company Act of 1940 (15 U.S.C 80a-8).

                  (e)       [ ]

                            An investment adviser in accordance with 240.13d-1
                            (b)(1)(ii)(E);

                  (f)       [ ]

                            An employee benefit plan or endowment fund in
                            accordance with 240.13d-1(b)(1)(ii)(F);

                  (g)       [ ]

                            A parent holding company or control person in
                            accordance with 240.13d-1(b)(1)(ii)(G);

                  (h)       [ ]

                            A savings associations as defined in Section 3(b)
                            of the Federal Deposit Insurance Act (12 U.S.C.
                            1813);

                  (i)       [ ]

                            A church plan that is excluded from the definition
                            of an investment company under section 3(c)(14) of
                            the Investment Company Act of 1940 (15 U.S.C. 80a-
                            3);

                  (j)       [ ]

                            Group, in accordance with 240.13d-1(b)(1)(ii)(J).

                               Page 4 of 7 Pages



CUSIP No. 64115T104

Item 4            Ownership.

                  Provide the following information regarding the aggregate
                  number and percentage of the class of securities of the issuer
                  identified in Item 1.

                  (a)       Amount beneficially owned: 11,551,382 shares.

                  (b)       Percent of class: 38.7%.

                  (c)       Number of shares as to which the person has:

                            (i) Sole power to vote or to direct the vote
                            1,003,000.

                            (ii) Shared power to vote or to direct the vote
                            10,548,382.

                            (iii) Sole power to dispose or to direct the
                            disposition of 1,003,000.

                            (iv) Shared power to dispose or to direct the
                            disposition of 10,548,382.

                  Instruction. For computations regarding securities which
                  represent a right to acquire an underlying security see
                  240.13d3(d)(1).

Item 5            Ownership of Five Percent or Less of a Class

                  If this statement is being filed to report the fact that as of
                  the date hereof the reporting person has ceased to be the
                  beneficial owner of more than five percent of the class of
                  securities, check the following [ ].

                  Instruction: Dissolution of a group requires a response to
                  this item.

Item 6            Ownership of More than Five Percent on Behalf of Another
                  Person.

                  Atlantic Trust Company, N.A., a limited purpose, national
                  chartered trust company, has aggregate holdings of NetScout
                  Systems, Inc. exceeding 5% which require us to file this
                  form. Holdings of this security exceed 5% by the following
                  persons:

                  Anil Singhal Revocable Trust
                  Jyoti Popat Grat#2 Inv. Trust

                               Page 5 of 7 Pages



CUSIP No. 64115T104

                  If any other person is known to have the right to receive or
                  the power to direct the receipt of dividends from, or the
                  proceeds from the sale of, such securities, a statement to
                  that effect should be included in response to this item and,
                  if such interest relates to more than five percent of the
                  class, such person should be identified. A listing of the
                  shareholders of an investment company registered under the
                  Investment Company Act of 1940 or the beneficiaries of
                  employee benefit plan, pension fund or endowment fund is not
                  required.

Item 7            Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported on By the Parent Holding
                  Company or Control Person. If a parent holding company or
                  Control person has filed this schedule, pursuant to Rule
                  13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an
                  exhibit stating the identity and the Item 3 classification of
                  the relevant subsidiary. If a parent holding company or
                  control person has filed this schedule pursuant to Rule
                  13d-1(c) or Rule 13d-1(d), attach an exhibit stating the
                  identification of the relevant subsidiary.

Item 8            Identification and Classification of Members of the Group

                  If a group has filed this schedule pursuant to
                  240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach
                  an exhibit stating the identity and Item 3 classification of
                  each member of the group. If a group has filed this schedule
                  pursuant to 240.13d-1(c) or 240.13d-1(d), attach an exhibit
                  stating the identity of each member of the group.

Item 9            Notice of Dissolution of Group

                  Notice of dissolution of a group may be furnished as an
                  exhibit stating the date of the dissolution and that all
                  further filings with respect to transactions in the security
                  reported on will be filed, if required, by members of the
                  group, in their individual capacity. See Item 5.

Item 10           Certification

                  (a)       The following certification shall be included if the
                            statement is filed pursuant to 240.13d-1(b):

                            By signing below I certify that, to the best of my
                            knowledge and belief, the securities referred to
                            above were acquired and are held in the ordinary
                            course of business and were not acquired and are not
                            held for thepurpose of or with the effect of
                            changing or influencing the control of the issuer of
                            the securities and were not acquired and are not
                            held in connection with or as a participant in any
                            transaction having that purpose or effect.

                               Page 6 of 7 Pages



CUSIP No. 64115T104

                                   SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that theinformation set forth in this statement is true, complete and
correct.

DATE: 03/28/03                      Atlantic Trust Company, N.A.

                                    By: /s/ Stephen E. Prostano
                                        ----------------------------------------
                                    Name: Stephen E. Prostano
                                    Title: Chief Operating Officer and Chief
                                           Financial Officer

*Effective 2/1/02 Name change:
From: "Pell Rudman Trust Company, N.A.
To: Atlantic Trust Company, N.A.

The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

NOTE: Schedules filed in paper format shall include a signed original
and five copies of the schedule, including all exhibits.

See 240.13d-7 for other parties for whom copies are to be sent.

Attention: Intentional misstatements or omissions of fact constitute Federal
criminal violations (See 18 U.S.C. 1001)

http://www.sec.gov/divisions/corpfin/forms/13g.htm
Last update: 02/27/2002

                               Page 7 of 7 Pages