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 * Van Eis Jan   2. Issuer Name and Ticker or Trading Symbol ACETO CORP [ACET] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) V.P. International Operations (Last) (First) (Middle) ONE HOLLOW LANE, SUITE 201 3. Date of Earliest Transaction (Month/Day/Year) 12/06/2010 (Street) LAKE SUCCESS, NY 11042 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 12/06/2010   M   1,146 A (1) (2) 5,210 D

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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

Restricted Stock Units

(1)

12/06/2010

M

431

(1)

(1)

Common Stock

431

$ 0

0

D

Restricted Stock Units

(2)

12/06/2010

M

715

(2)

(2)

Common Stock

715

$ 0

707

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Van Eis Jan ONE HOLLOW LANE SUITE 201 LAKE SUCCESS, NY 11042			V.P. International Operations

Signatures

/s/ Jan Van Eis		12/08/2010
**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)	Vesting of Restricted Stock Units (RSU) and accrued dividend equivalents. 1,200 RSU's were granted on December 6, 2007 and vest 1/3 each year beginning on December 6, 2008. Each RSU represents the contingent right to receive one share of common stock upon vesting. Each RSU also accrues dividend equivalents on each date that Aceto pays a cash dividend to holders of common stock generally. RSU's attributable to such dividend equivalents are subject to the same terms and conditions as the RSU's to which such dividend equivalents relate.
(2)	Vesting of Restricted Stock Units (RSU) and accrued dividend equivalents. 2,000 RSU's were granted on December 4, 2008 and vest 1/3 each year beginning on December 6, 2009. Each RSU represents the contingent right to receive one share of common stock upon vesting. Each RSU also accrues dividend equivalents on each date that Aceto pays a cash dividend to holders of common stock generally. RSU's attributable to such dividend equivalents are subject to the same terms and conditions as the RSU's to which such dividend equivalents relate.

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