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 * QUAKER CAPITAL MANAGEMENT CORP   2. Issuer Name and Ticker or Trading Symbol PERFORMANCE TECHNOLOGIES INC \DE\ [PTIX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 601 TECHNOLOGY DRIVE, SUITE 310 3. Date of Earliest Transaction (Month/Day/Year) 05/09/2011 (Street) CANONSBURG, PA 15317 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ 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, $.01 par value 05/09/2011   S   100,000 (2) D $ 2.2424 1,494,115 (3) I Through two partnerships (1)

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
QUAKER CAPITAL MANAGEMENT CORP 601 TECHNOLOGY DRIVE SUITE 310 CANONSBURG, PA 15317		X
Schoeppner Mark G 601 TECHNOLOGY DRIVE SUITE 310 CANONSBURG, PA 15317		X
Quaker Premier, L.P. 601 TECHNOLOGY DRIVE SUITE 310 CANONSBURG, PA 15317		X
Quaker Premier II, L.P. 601 TECHNOLOGY DRIVE SUITE 310 CANONSBURG, PA 15317		X
QUAKER CAPITAL PARTNERS I LP 601 TECHNOLOGY DRIVE SUITE 310 CANONSBURG, PA 15317		X
QUAKER CAPITAL PARTNERS II LP 601 TECHNOLOGY DRIVE SUITE 310 CANONSBURG, PA 15317		X

Signatures

QUAKER CAPITAL PARTNERS I, L.P., By: Quaker Premier, L.P., its general partner, By: Quaker Capital Management Corporation, its general partner, By: /s/ Mark G. Schoeppner, President		05/11/2011
**Signature of Reporting Person		Date
QUAKER CAPITAL MANAGEMENT CORPORATION, By: /s/ Mark G. Schoeppner, President		05/11/2011
**Signature of Reporting Person		Date
QUAKER PREMIER, L.P., By: Quaker Capital Management Corporation, its general partner, By: /s/ Mark G. Schoeppner, President		05/11/2011
**Signature of Reporting Person		Date
QUAKER PREMIER II, L.P., By: Quaker Capital Management Corporation, its general partner, By: /s/ Mark G. Schoeppner, President		05/11/2011
**Signature of Reporting Person		Date
QUAKER CAPITAL PARTNERS II, L.P., By: Quaker Premier II, L.P., its general partner, By: Quaker Management Corporation, its general partner, By: /s/ Mark G. Schoeppner, President		05/11/2011
**Signature of Reporting Person		Date
/s/ Mark G. Schoeppner		05/11/2011
**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)	The shares of common stock of Performance Technologies, Incorporated reported on this Form 4 are owned of record by Quaker Capital Partners I, L.P. ("Quaker I") and Quaker Capital Partners II, L.P. ("Quaker II"). Quaker Premier, L.P. ("Premier") is the sole general partner of Quaker I. Quaker Premier II, L.P. ("Premier II") is the sole general partner of Quaker II. Quaker Capital Management Corporation ("QCMC") is the sole general partner of each of Premier and Premier II. Mark G. Schoeppner is QCMC's President and sole executive officer and director. Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or any other purpose.
(2)	72,600 of these shares of the Issuer's common stock were sold by Quaker I and 27,400 of these shares of the Issuer's common stock were sold by Quaker II.
(3)	980,700 of these shares are owned of record by Quaker I and 513,415 of these shares are owned of record by Quaker II.

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