Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SINEGAL JAMES D
   2. Issuer Name and Ticker or Trading Symbol
COSTCO WHOLESALE CORP /NEW [COST] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
President and CEO
(Last)
(First)
(Middle)
999 LAKE DRIVE		 3. Date of Earliest Transaction (Month/Day/Year)
03/18/2010
(Street)

ISSAQUAH, WA 98027		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 03/18/2010   S(1)   8,000 D (2) 719,647 D  
Common Stock               1,280,649 I By LLC
Common Stock               50,955 I By GRAT
Common Stock               50,955 I By Spouse's GRAT

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SINEGAL JAMES D
999 LAKE DRIVE
ISSAQUAH, WA 98027		   X     President and CEO  

Signatures

 Deanna K. Nakashima, attorney-in-fact   03/19/2010
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This sale was effected pursuant to a 10b5-1 trading plan.
(2) Shares were sold as follows: 100 $60.9500 100 $60.9600 200 $60.9900 300 $61.0000 200 $61.0100 300 $61.0200 100 $61.0400 100 $61.0600 200 $61.0800 100 $61.0900 200 $61.1000 100 $61.1100 100 $61.1200 300 $61.1300 300 $61.1400 300 $61.1500 200 $61.1600 300 $61.1700 300 $61.1800 500 $61.1900 300 $61.2000 300 $61.2100 500 $61.2200 200 $61.2300 100 $61.2400 400 $61.2500 100 $61.2600 400 $61.2700 300 $61.2800 200 $61.2900 100 $61.3000 100 $61.3100 200 $61.3200 100 $61.3300 100 $61.3500 100 $61.3600 200 $61.3900

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