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 *
GROSS WILLIAM H
   2. Issuer Name and Ticker or Trading Symbol
PIMCO CORPORATE OPPORTUNITY FUND [PTY] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See Remarks
(Last)
(First)
(Middle)
C/O PIMCO, 840 NEWPORT CENTER DRIVE, SUITE 100		 3. Date of Earliest Transaction (Month/Day/Year)
07/09/2010
(Street)

NEWPORT BEACH, CA 92660		 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 07/09/2010   G V 35,000 A $ 0 35,000 (1) I BY CHILD TRUST #2
COMMON STOCK 07/09/2010   G V 13,200 A $ 0 13,200 (2) I BY CHILD TRUST #3
COMMON STOCK 07/09/2010   G V 18,100 A $ 0 18,100 (3) I BY CHILD TRUST #5
COMMON STOCK 07/09/2010   G V 12,700 A $ 0 12,700 (4) I BY CHILD TRUST #6
COMMON STOCK 07/09/2010   G V 13,400 A $ 0 13,400 (5) I BY CHILD TRUST #8
COMMON STOCK               631,935 I BY CHILD TRUST #1
COMMON STOCK               631,933 I BY CHILD TRUST #4
COMMON STOCK               631,932 I BY CHILD TRUST #7
COMMON STOCK               120,000 I BY SPOUSE
COMMON STOCK               144,999 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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
GROSS WILLIAM H
C/O PIMCO
840 NEWPORT CENTER DRIVE, SUITE 100
NEWPORT BEACH, CA 92660		       See Remarks

Signatures

 /s/ Michael Flaherty, Attorney-in-Fact for William H. Gross   11/19/2010
**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) As of July 9, 2010 (the "Effective Date"), the reporting person acquired shared investment control over the securities held by Child Trust #2 and therefore may be deemed to be the beneficial owner of such securities. The amount reflected in Box 5 represents securities acquired by Child Trust #2 prior to the Effective Date, as follows: (a) 15,800 shares on 12/18/2006 at $16.9975 per share (such price represents a weighted average price, as the shares were purchased in multiple transactions at prices ranging from $16.98 to $17.00, inclusive) and (b) 19,200 shares on 12/19/2006 at $17.00 per share. The foregoing transactions (a)-(b) are disclosed solely for informational purposes. The reporting person expressly disclaims beneficial ownership of securities held by Child Trust #2 to the extent held prior to the Effective Date.
(2) As of the Effective Date, the reporting person acquired shared investment control over the securities held by Child Trust #3 and therefore may be deemed to be the beneficial owner of such securities. The amount reflected in Box 5 represents securities acquired by Child Trust #3 prior to the Effective Date, as follows: (a) 13,000 shares on 1/5/2010 at $14.088 per share (such price represents a weighted average price, as the shares were purchased in multiple transactions at prices ranging from $14.069 to $14.14, inclusive) and (b) 200 shares on 1/6/2010 at $14.49 per share. The foregoing transactions (a)-(b) are disclosed solely for informational purposes. The reporting person expressly disclaims beneficial ownership of securities held by Child Trust #3 to the extent held prior to the Effective Date.
(3) As of the Effective Date, the reporting person acquired shared investment control over the securities held by Child Trust #5 and therefore may be deemed to be the beneficial owner of such securities. The amount reflected in Box 5 represents securities acquired by Child Trust #5 prior to the Effective Date, as follows: (a) 16,900 shares on 12/20/2006 at $17.00 per share and (b) 1,200 shares on 12/21/2006 at $17.00 per share. The foregoing transactions (a)-(b) are disclosed solely for informational purposes. The reporting person expressly disclaims beneficial ownership of securities held by Child Trust #5 to the extent held prior to the Effective Date.
(4) As of the Effective Date, the reporting person acquired shared investment control over the securities held by Child Trust #6 and therefore may be deemed to be the beneficial owner of such securities. The amount reflected in Box 5 represents securities acquired by Child Trust #6 prior to the Effective Date, as follows: (a) 12,500 shares on 1/5/2010 at $14.2438 per share (such price represents a weighted average price, as the shares were purchased in multiple transactions at prices ranging from $14.20 to $14.29, inclusive) and (b) 200 shares on 1/6/2010 at $14.44 per share. The foregoing transactions (a)-(b) are disclosed solely for informational purposes. The reporting person expressly disclaims beneficial ownership of securities held by Child Trust #6 to the extent held prior to the Effective Date.
(5) As of the Effective Date, the reporting person acquired shared investment control over the securities held by Child Trust #8 and therefore may be deemed to be the beneficial owner of such securities. The amount reflected in Box 5 represents securities acquired by Child Trust #8 prior to the Effective Date, as follows: (a) 13,000 shares on 1/5/2006 at $14.07 per share and (b) 400 shares on 1/6/2010 at $14.40 per share. The foregoing transactions (a)-(b) are disclosed solely for informational purposes. The reporting person expressly disclaims beneficial ownership of securities held by Child Trust #8 to the extent held prior to the Effective Date.
 
Remarks:
The Reporting Person is Portfolio Manager of the Issuer. The Reporting Person is the Co-Chief Investment Officer of Pacific Investment Management Company LLC (PIMCO) and is a member of PIMCO's Executive Committee. PIMCO serves as sub-adviser for the Issuer.

With respect to any weighted average price reported herein, the reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the applicable ranges referenced herein.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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