Ownership Submission
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 *
VENROCK ASSOCIATES V LP
  2. Issuer Name and Ticker or Trading Symbol
CASTLIGHT HEALTH, INC. [CSLT]
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)
C/O VENROCK, 3340 HILLVIEW AVENUE
3. Date of Earliest Transaction (Month/Day/Year)
11/06/2015
(Street)

PALO ALTO, CA 94304
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
Class B Common Stock 11/06/2015   P   531,000 A $ 3.81 531,000 I By Funds (1)
Class B Common Stock 11/09/2015   P   125,000 A $ 3.84 656,000 I By Funds (2)
Class B Common Stock 11/10/2015   P   350,000 A $ 3.77 1,006,000 I By Funds (3)

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
VENROCK ASSOCIATES V LP
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304
    X    
VENROCK PARTNERS V L P
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304
    X    
Venrock Entrepreneurs Fund V, L.P.
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304
    X    
Venrock Management V, LLC
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304
    X    
Venrock Partners Management V, LLC
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304
    X    
VEF Management V, LLC
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304
    X    

Signatures

 /s/ David L. Stepp, authorized signatory   11/10/2015
**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) Venrock Associates V, L.P. ("VA5") holds an aggregate of 479,139 shares, Venrock Partners V, L.P. ("VP5") holds an aggregate of 40,591 shares and Venrock Entrepreneurs Fund V, L.P. ("VEF5") holds an aggregate of 11,270 shares. Venrock Management V, LLC, VEF Management V, LLC and Venrock Partners Management V, LLC (collectively, the "Venrock GP Entities") are the sole general partners of VA5, VEF5 and VP5 (collectively, the "Funds"), respectively, and have voting and investment power over the shares held by the Funds. Each of the Venrock GP Entities disclaims beneficial ownership of the shares held by the Funds, except to the extent of their respective indirect pecuniary interests therein.
(2) VA5 holds an aggregate of 591,931 shares, VP5 holds an aggregate of 50,146 shares and VEF5 holds an aggregate of 13,923 shares. The Venrock GP Entities are the sole general partners of the Funds, and have voting and investment power over the shares held by the Funds. Each of the Venrock GP Entities disclaims beneficial ownership of the shares held by the Funds, except to the extent of their respective indirect pecuniary interests therein.
(3) VA5 holds an aggregate of 907,748 shares, VP5 holds an aggregate of 76,901 shares and VEF5 holds an aggregate of 21,351 shares. The Venrock GP Entities are the sole general partners of the Funds, and have voting and investment power over the shares held by the Funds. Each of the Venrock GP Entities disclaims beneficial ownership of the shares held by the Funds, except to the extent of their respective indirect pecuniary interests therein.

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