Edgar Filing: CASTLIGHT HEALTH, INC.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G/A

Under the Securities Exchange Act of 1934
(Amendment No. 3)*

Castlight Health, Inc.
(Name of Issuer)

Class B Common Stock, $0.0001 par value per share
(Title of Class of Securities)

14862Q100
(CUSIP Number)

December 31, 2018
(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)
¨	Rule 13d-1(c)
x	Rule 13d-1(d)

(Page 1 of 14 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 the purpose 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).

CUSIP No. 14862Q100

13G/A

Page 2 of 14 Pages

1	NAME OF REPORTING PERSON Oak Investment Partners XII, Limited Partnership
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 6,027,622 shares of Class B Common Stock¹
	6	SHARED VOTING POWER 0 shares of Class B Common Stock
	7	SOLE DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock¹
	8	SHARED DISPOSITIVE POWER 0 shares of Class B Common Stock
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock¹
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON PN

_____________________

¹ Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

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1	NAME OF REPORTING PERSON Oak Associates XII, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock²
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock²
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock²
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON OO-LLC

_____________________

²Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

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1	NAME OF REPORTING PERSON Oak Management Corporation
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock³
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock³
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock³
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON CO

_____________________

³Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

Page 5 of 14 Pages

1	NAME OF REPORTING PERSON Bandel L. Carano
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock⁴
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock⁴
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock⁴
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON IN

_____________________

⁴ Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

Page 6 of 14 Pages

1	NAME OF REPORTING PERSON Edward F. Glassmeyer
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock⁵
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock⁵
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock⁵
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON IN

_____________________

⁵ Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

Page 7 of 14 Pages

1	NAME OF REPORTING PERSON Fredric W. Harman
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock⁶
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock⁶
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock⁶
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON IN

_____________________

⁶ Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

Page 8 of 14 Pages

1	NAME OF REPORTING PERSON Ann H. Lamont
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock⁷
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock⁷
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock⁷
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON IN

_____________________

⁷ Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

Page 9 of 14 Pages

1	NAME OF REPORTING PERSON Grace A. Ames
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) ¨ (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:	5	SOLE VOTING POWER 0 shares of Class B Common Stock
	6	SHARED VOTING POWER 6,027,622 shares of Class B Common Stock⁸
	7	SOLE DISPOSITIVE POWER 0 shares of Class B Common Stock
	8	SHARED DISPOSITIVE POWER 6,027,622 shares of Class B Common Stock⁸
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 6,027,622 shares of Class B Common Stock⁸
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.93%
12	TYPE OF REPORTING PERSON IN

_____________________

⁸ Represents 5,958,872 shares of Class B Common Stock plus options to acquire 68,750 shares of Class B Common Stock.

CUSIP No. 14862Q100

13G/A

Page 10 of 14 Pages

Item 1(a).	NAME OF ISSUER
	Castlight Health, Inc.

Item 1(b).	ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
	150 Spear Street, Suite 400
	San Francisco, CA 94105

Item 2(a).	NAME OF PERSON FILING
	Oak Investment Partners XII, Limited Partnership ("Oak XII")
	Oak Associates XII, LLC ("Oak Associates XII")
	Oak Management Corporation ("Oak Management")
	Bandel L. Carano
	Edward F. Glassmeyer
	Fredric W. Harman
	Ann H. Lamont
	Grace A. Ames

Item 2(b).	ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
	c/o Oak Management Corporation
	901 Main Avenue, Suite 600
	Norwalk, CT 06851

Item 2(c).	CITIZENSHIP
	Please refer to Item 4 on each cover sheet for each filing person.

Item 2(d).	TITLE OF CLASS OF SECURITIES
	Class B Common Stock, $0.0001 par value per share (the "Class B Common Stock")

Item 2(e).	CUSIP NUMBER
	14862Q100

Item 3.

IF THIS STATEMENT IS FILED PURSUANT TO Rules 13d-1(b), OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:

(a)	¨	Broker or dealer registered under Section 15 of the Act;
(b)	¨	Bank as defined in Section 3(a)(6) of the Act;
(c)	¨	Insurance company as defined in Section 3(a)(19) of the Act;

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(d)	¨	Investment company registered under Section 8 of the Investment Company Act of 1940;
(e)	¨	An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);
(f)	¨	An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);
(g)	¨	A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);
(h)	¨	A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;
(i)	¨	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;
(j)	¨	A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J);
(k)	¨	Group, in accordance with Rule 13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please

specify the type of institution: ___________________________________________

Item 4.	OWNERSHIP
	The information in Items 1 and 5 through 11 on the cover pages of this Schedule 13G is hereby incorporated by reference.

	The approximate percentages of shares of Class B Common Stock reported as beneficially owned by the Reporting Persons are based upon approximately 101,652,931 shares of Class B Common Stock outstanding as of November 5, 2018, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2018 filed by the Company with the Securities and Exchange Commission on November 7, 2018, plus 68,750 shares of Class B Common Stock described below that are issuable upon exercise by the Reporting Persons of options to acquire Class B Common Stock.

	Oak Associates XII is the general partner of Oak XII. Oak Management is the manager of Oak XII. Bandel L. Carano, Edward F. Glassmeyer, Fredric W. Harman, Ann H. Lamont, and Grace A. Ames are the managing members of Oak Associates XII and, as such, may be deemed to possess shared beneficial ownership of the shares of Class V Common Stock held by Oak XII.

	Amounts shown as beneficially owned by each of Oak XII, Oak Associates XII, Oak Management, Bandel L. Carano, Edward F. Glassmeyer, Fredric W. Harman, Ann H. Lamont, and Grace A. Ames include options to purchase 68,750 shares of Class B Common Stock which may be deemed to be held by Ann H. Lamont on behalf of Oak XII.

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Page 12 of 14 Pages

By making this filing, the Reporting Persons acknowledge that they may be deemed to constitute a “group” within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, in connection with the securities of the Issuer. Each Reporting Person disclaims the existence of a “group” and disclaims beneficial ownership of all shares of Class B Common Stock or securities convertible into or exercisable for Class B Common Stock other than any shares or other securities reported herein as being owned by it, him or her, as the case may be.

Item 5.	OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
	Not applicable.

Item 6.	OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
	Not applicable.

Item 7.	IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY OR CONTROL PERSON
	Not applicable.

Item 8.	IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
	Not applicable.

Item 9.	NOTICE OF DISSOLUTION OF GROUP
	Not applicable.

Item 10.	CERTIFICATION
	Not applicable.

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SIGNATURES

After reasonable inquiry and to the best of his or its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

DATE: January 28, 2019

Entities: Oak Investment Partners XII, Limited Partnership Oak Associates XII, LLC Oak Management Corporation


/s/ Edward F. Glassmeyer
Name: Edward F. Glassmeyer
Title: General Partner or Managing Member or attorney-in-fact for the above-listed entities


Individuals: Bandel L. Carano Edward F. Glassmeyer Fredric W. Harman Ann H. Lamont Grace A. Ames

/s/ Edward F. Glassmeyer
Edward F. Glassmeyer, individually and as attorney-in-fact for the above-listed individuals

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Page 14 of 14 Pages

INDEX TO EXHIBITS

EXHIBIT A - Joint Filing Agreement (previously filed)

EXHIBIT B - Power of Attorney (previously filed)