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 * Hanson Theodore S.   2. Issuer Name and Ticker or Trading Symbol ON ASSIGNMENT INC [ASGN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) CFO, Apex, a sub of the issuer (Last) (First) (Middle) ON ASSIGNMENT, INC., 26745 MALIBU HILLS ROAD 3. Date of Earliest Transaction (Month/Day/Year) 04/13/2015 (Street) CALABASAS, CA 91301 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 04/13/2015   A   1,961 (1) A $ 39.48 299,865 D   Common Stock 04/13/2015   D   649 (2) D $ 39.48 299,216 D   Common Stock 04/13/2015   A   1,463 (3) A $ 35.09 300,679 D   Common Stock 04/13/2015   A   3,839 (4) A $ 35.09 304,518 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
Hanson Theodore S. ON ASSIGNMENT, INC. 26745 MALIBU HILLS ROAD CALABASAS, CA 91301			CFO, Apex, a sub of the issuer

Signatures

By: James L. Brill, CAO For: Theodore S. Hanson		04/15/2015
**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)	On February 13,2015,performance targets were certified for these acquired shares which were the 2014 performance portion of an RSU grant made to the executive officer on May 15,2013.
(2)	Executive officer elected to satisfy tax withholding obligations upon vesting by having the issuer withhold a number of vested shares equal to that of the executive officer's tax liability.
(3)	On February 13, 2015, performance targets were certified for these shares which were the 2014 performance portion of an RSU grant made to the executive officer on May 15, 2014. They will vest on May 15, 2015, subject to the executive officer's continued service to the Company.
(4)	On February 13, 2015, performance targets were certified for these shares which were the 2014 performance portion of an RSU grant made to the executive officer on May 15,2012. They will vest on May 31, 2015, subject to the executive officer's continued service to the Company.

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