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 *
ROBERTS BRYAN E
   2. Issuer Name and Ticker or Trading Symbol
CASTLIGHT HEALTH, INC. [CSLT] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ 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)
06/20/2018
(Street)

PALO ALTO, CA 94304		 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
Class B Common Stock 06/20/2018   A   32,183 (1) A $ 0 109,668 D (2)  
Class B Common Stock               5,222,709 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
ROBERTS BRYAN E
C/O VENROCK
3340 HILLVIEW AVENUE
PALO ALTO, CA 94304		   X   X    

Signatures

 /s/ Bryan E. Roberts   06/22/2018
**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) Represents an award of restricted stock units ("RSUs"). 25% of the RSUs will vest on August 16, 2018 and an additional 25% will vest on each quarterly anniversary thereafter. Each RSU represents a contingent right to receive one share of the Issuer's Class B common stock upon settlement for no consideration.
(2) The reporting person is a member of VR Management, LLC (the "Management Company"). Under an agreement between the reporting person and the Management Company, the reporting person is deemed to hold the reported shares for the sole benefit of the Management Company and must exercise the reported shares solely upon the direction of the Management Company, which is entitled to the shares. The Management Company may be deemed the indirect beneficial owner of the reported shares, and the reporting person may be deemed the indirect beneficial owner of the reported shares through his interest in the Management Company. The reporting person disclaims beneficial ownership of the reported shares except to the extent of his pecuniary interest therein.
(3) Venrock Associates VI, L.P. ("VA6") holds an aggregate of 3,677,257 shares, Venrock Partners VI, L.P. ("VP6") holds an aggregate of 288,722 shares, Venrock Associates V, L.P. ("VA5") holds an aggregate of 1,133,948 shares, Venrock Partners V, L.P. ("VP5") holds an aggregate of 96,139 shares and Venrock Entrepreneurs Fund V, L.P. ("VEF5") holds an aggregate of 26,643 shares. Venrock Management VI, LLC, Venrock Partners Management VI, LLC, 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 VA6, VP6, VA5, VEF5 and VP5 (collectively, the "Funds"), respectively, and may be deemed to beneficially own these shares. Dr. Roberts is a member of the Venrock GP Entities and may be deemed to beneficially own these shares. Dr. Roberts and the Venrock GP Entities expressly disclaim beneficial ownership over these shares except to the extent of their indirect pecuniary interests therein.

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