13G Filing: Healthcor Management LP and Pacira Pharmaceuticals Inc. (PCRX)

SECURITIES & EXCHANGE COMMISSION

Washington, D.C. 20549

———————-

SCHEDULE 13G

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS
FILED PURSUANT

TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS
THERETO FILED

PURSUANT TO RULE 13d-2

(Amendment No. )*

Pacira Pharmaceuticals, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

695127100

(CUSIP
Number)

August
3, 2017

(Date of Event Which Requires Filing of
this Statement)

Check the appropriate box to designate the
rule pursuant to which this Schedule is filed:

¨
Rule 13d-1(b)

x   Rule
13d-1(c)

¨    Rule
13d-1(d)

(Page 1 of 17 Pages)

*The remainder of this cover page shall be
filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent
amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of
this cover page shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934
(“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions
of the Act (however, see the Notes).