Sec Form 4 Filing - Sanderling Venture Partners VI LP @ Pacira Pharmaceuticals, Inc. - 2013-03-15

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 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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Sanderling Venture Partners VI LP 2. Issuer Name and Ticker or Trading Symbol Pacira Pharmaceuticals, Inc. [ PCRX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 400 SOUTH EL CAMINO REAL, SUITE 1200 3. Date of Earliest Transaction (MM/DD/YY) 03/15/2013 (Street) SAN MATEO, CA94402 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 03/15/2013 J( 11 ) 200,000 D $ 0 0 D ( 12 ) ( 9 ) ( 10 ) Common Stock 03/15/2013 J( 11 ) 25,133 A $ 0 67,966 D ( 13 ) ( 9 ) ( 10 ) Common Stock 03/18/2013 S( 1 ) 28,956 D $ 29.2 ( 2 ) 530,497 D ( 3 ) ( 9 ) ( 10 ) Common Stock 03/18/2013 S( 1 ) 23,969 D $ 29.2 ( 2 ) 24,688 D ( 4 ) ( 9 ) ( 10 ) Common Stock 03/18/2013 S( 1 ) 28,558 D $ 29.2 ( 2 ) 29,415 D ( 5 ) ( 9 ) ( 10 ) Common Stock 03/18/2013 S( 1 ) 29,825 D $ 28.19 ( 6 ) 500,672 D ( 3 ) ( 9 ) ( 10 ) Common Stock 03/18/2013 S( 1 ) 24,688 D $ 28.19 ( 6 ) 0 D ( 4 ) ( 9 ) ( 10 ) Common Stock 03/18/2013 S( 1 ) 29,415 D $ 28.19 ( 6 ) 0 D ( 5 ) ( 9 ) ( 10 ) Common Stock 03/19/2013 S( 1 ) 38,250 D $ 27.66 ( 7 ) 462,422 D ( 3 ) ( 9 ) ( 10 ) Common Stock 03/19/2013 S( 1 ) 46,339 D $ 26.95 ( 8 ) 416,083 D ( 3 ) ( 9 ) ( 10 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Sanderling Venture Partners VI LP 400 SOUTH EL CAMINO REAL SUITE 1200 SAN MATEO, CA94402 X Sanderling VI Beteiligungs GmbH & Co KG 400 SOUTH EL CAMINO REAL SUITE 1200 SAN MATEO, CA94402 X Sanderling Ventures Management VI 400 SOUTH EL CAMINO REAL SUITE 1200 SAN MATEO, CA94402 X Sanderling VI Limited Partnership 400 SOUTH EL CAMINO REAL SUITE 1200 SAN MATEO, CA94402 X Sanderling Venture Partners VI Co Investment Fund LP 400 SOUTH EL CAMINO REAL SUITE 1200 SAN MATEO, CA94402 X MIDDLETON FRED A 400 SOUTH EL CAMINO REAL SUITE 1200 SAN MATEO, CA94402 X Signatures /s/ See Exhibit 99.1 03/20/2013 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting persons on February 4, 2013. ( 2 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.59 to $29.58, inclusive. The reporting person undertakes to provide to Pacira Pharmaceuticals, Inc., any security holder of Pacira Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) of this Form 4. ( 3 )The securities are held directly by Sanderling Venture Partners VI, L.P. ( 4 )The securities are held directly by Sanderling VI Beteiligungs GmbH & Co. KG. The address for Sanderling VI Beteiligungs GmbH & Co. KG is c/o Sanderling Ventures, 400 South El Camino Real, Suite 1200, San Mateo, CA 94402. ( 5 )The securities are held directly by Sanderling VI Limited Partnership. The address for Sanderling VI Limited Partnership is c/o Sanderling Ventures, 400 South El Camino Real, Suite 1200, San Mateo, CA 94402. ( 6 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.70 to 28.58, inclusive. The reporting person undertakes to provide to Pacira Pharmaceuticals, Inc., any security holder of Pacira Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (5) of this Form 4. ( 7 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.21 to $28.20, inclusive. The reporting person undertakes to provide to Pacira Pharmaceuticals, Inc., any security holder of Pacira Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (6) of this Form 4. ( 8 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.52 to $27.20, inclusive. The reporting person undertakes to provide to Pacira Pharmaceuticals, Inc., any security holder of Pacira Pharmaceuticals, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (7) of this Form 4. ( 9 )Fred Middleton, a member of the Board of Directors of the Issuer, is a managing director of Middleton, McNeil, Mills & Associates VI, LLC, which has the ultimate voting and investment power over shares held of record by Sanderling Venture Partners VI, L.P., Sanderling VI Beteiligungs GmbH & Co. KG, Sanderling VI Limited Partnership and Sanderling Venture Partners VI Co-Investment Fund, L.P. and he may be deemed to have voting and investment power over shares held of record by Sanderling Venture Partners VI, L.P., ( 10 )Sanderling VI Beteiligungs GmbH & Co. KG, Sanderling VI Limited Partnership and Sanderling Venture Partners VI Co-Investment Fund, L.P. Mr. Middleton is the owner of Sanderling Ventures Management VI and he may be deemed to have voting and investment power over shares held of record by Sanderling Ventures Management VI. Mr. Middleton disclaims beneficial ownership over the shares held by Sanderling Ventures and its affiliates, except to the extent of his pecuniary interest therein. ( 11 )On March 15, 2013, Sanderling Venture Partners VI Co-Investment Fund, L.P. distributed an aggregate of 1,000,000 shares of the Issuer's common stock pro rata to its partners, including Sanderling Ventures Management VI, for no consideration (the "Distribution"). Sanderling Ventures Management VI subsequently distributed the securities received in the Distribution to its underlying members (the "GP Distribution"). ( 12 )The securities were held directly by Sanderling Ventures Management VI. The address for Sanderling Ventures Management VI is c/o Sanderling Ventures, 400 South El Camino Real, Suite 1200, San Mateo, CA 94402. ( 13 )The securities are held directly by Mr. Middleton. On March 15, 2013, Mr. Middleton received 25,133 shares of the Issuer's common stock as a result of the GP Distribution. The address for Mr. Middleton is c/o Sanderling Ventures, 400 South El Camino Real, Suite 1200, San Mateo, CA 94402.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.