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Form SC 13G CASTLIGHT HEALTH, INC. Filed by: FMR LLC

December 10, 2014 11:51 AM EST
SCHEDULE 13G
 
Amendment No. 0
CASTLIGHT HEALTH INC
CLASS B COMMON STOCK
Cusip #14862Q100
Check the appropriate box to designate the rule pursuant to which this 
Schedule is filed:
[x] 	  Rule 13d-1(b)
[ ] 	  Rule 13d-1(c)
[ ] 	  Rule 13d-1(d)
Cusip #14862Q100
Item 1: 	   	Reporting Person - FMR LLC
Item 2: 	   	(a)  	[ ]
   	   	(b)  	[ ]
Item 4: 	   	Delaware
Item 5: 	   	100,100
Item 6: 	   	0
Item 7: 	   	9,459,941
Item 8: 	   	0
Item 9: 	   	9,459,941
Item 11: 	   	26.243%
Item 12: 	   	HC
Cusip #14862Q100
Item 1: 	   	Reporting Person - Edward C. Johnson 3d
Item 2: 	   	(a)  	[ ]
   	   	(b)  	[ ]
Item 4: 	   	United States of America
Item 5: 	   	0
Item 6: 	   	0
Item 7: 	   	9,459,941
Item 8: 	   	0
Item 9: 	   	9,459,941
Item 11: 	   	26.243%
Item 12: 	   	IN
Cusip #14862Q100
Item 1: 	   	Reporting Person - Abigail P. Johnson
Item 2: 	   	(a)  	[ ]
   	   	(b)  	[ ]
Item 4: 	   	United States of America
Item 5: 	   	0
Item 6: 	   	0
Item 7: 	   	9,459,941
Item 8: 	   	0
Item 9: 	   	9,459,941
Item 11: 	   	26.243%
Item 12: 	   	IN
Cusip #14862Q100
Item 1: 	   	Reporting Person - Fidelity Growth Company Fund
Item 2: 	   	(a)  	[ ]
   	   	(b)  	[ ]
Item 4: 	   	Massachusetts
Item 5: 	   	2,719,598
Item 6: 	   	0
Item 7: 	   	0
Item 8: 	   	0
Item 9: 	   	2,719,598
Item 11: 	   	7.544%
Item 12: 	   	IV
Cusip #14862Q100
Item 1: 	   	Reporting Person - Select Health Care Portfolio
Item 2: 	   	(a)  	[ ]
   	   	(b)  	[ ]
Item 4: 	   	Massachusetts
Item 5: 	   	1,909,250
Item 6: 	   	0
Item 7: 	   	0
Item 8: 	   	0
Item 9: 	   	1,909,250
Item 11: 	   	5.296%
Item 12: 	   	IV
 
Item 1(a). 	    	Name of Issuer:
 
  	  	          	CASTLIGHT HEALTH INC
 
Item 1(b). 	    	Address of Issuer's Principal Executive Offices:
 
  	  	          	685 MARKET STREET
SUITE 300
  	  	          	San Francisco, CA 94105
  	  	          	USA
 
Item 2(a). 	     	 Name of Person Filing:
 
  	   	               	 FMR LLC
 
Item 2(b). 	     	 Address or Principal Business Office or, if None, 
Residence:
 
  	   	               	 245 Summer Street, Boston, Massachusetts 02210
 
Item 2(c). 	     	 Citizenship:
 
  	   	               	 Not applicable
 
Item 2(d). 	     	 Title of Class of Securities:
 
  	   	               	 CLASS B COMMON STOCK
 
Item 2(e). 	     	 CUSIP Number:
 
  	   	               	 14862Q100
 
Item 3. 	    	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) 
or (c) and the
person filing, FMR LLC, is a parent holding company in accordance with
Section 240.13d-1(b)(1)(ii)(G).   (Note:  See Exhibit A).
 
Item 4. 	    	Ownership
 
  	  	     	(a)    Amount Beneficially Owned: 	9,459,941
 
  	  	     	(b)    Percent of Class: 	26.243%
 
  	  	     	(c)    Number of shares as to which such person has:
 
  	  	     	       (i)    sole power to vote or to direct the vote: 	
100,100
 
  	  	     	       (ii)    shared power to vote or to direct the vote: 	0
 
  	  	     	       (iii)    sole power to dispose or to direct the 
disposition of: 	9,459,941
 
  	  	     	       (iv)    shared power to dispose or to direct the 
disposition of: 	0
 
Item 5. 	    	Ownership of Five Percent or Less of a Class.
 
  	    	     	Not applicable.  5,342,240 of the shares of Class B
Common Stock of Castlight Health, Inc. reported as being beneficially owned
by the reporting persons at November 28, 2014, are included in this Schedule
13G because the reporting persons are deemed to beneficially own such shares
as a result of the direct ownership of 5,342,240 shares of Class A Common
Stock of Castlight Health, Inc. by investment companies advised by Fidelity
Management & Research Company and Pyramis Global Advisors Trust Company,
both of which are wholly-owned subsidiaries of FMR LLC, which shares of
Class A Common Stock are convertible into shares of Class B Common Stock at
the election of the holder at an exchange rate of 1:1.  Assuming the conversion
of all outstanding shares of Class A Common Stock into Class B Common Stock,
the 9,459,941 shares of Class B Common Stock reported as being beneficially
owned by the reporting persons in this Schedule 13G would represent
10.48% of the outstanding Class B Common Stock.
 
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.
 
  	    	     	See attached Exhibit A.
 
Item 8. 	    	Identification and Classification of Members of the Group.
 
  	    	     	Not applicable.
 
Item 9. 	    	Notice of Dissolution of Group.
 
  	    	  	Not applicable.
 
Item 10. 	    	Certifications.
 
  	    	     	

By signing below I certify that, to the best of my knowledge and belief, 
the securities referred to above were acquired and are held in the ordinary 
course of business and were not acquired and are not held for the purpose 
of or with the effect of changing or influencing the control of the issuer 
of the securities and were not acquired and are not held in connection with 
or as a participant in any transaction having that purpose or effect.

 
Signature
 
  	    	     	

After reasonable inquiry and to the best of my knowledge and belief, I 
certify that the information set forth in this statement is true, complete 
and correct.

  	December 9, 2014
  	Date
 
  	/s/ Scott C. Goebel
  	Signature
 
  	Scott C. Goebel
  	 Duly authorized under Power of Attorney effective as of June 1, 2008, 
by and on behalf of FMR LLC and its direct and indirect subsidiaries*


* This power of attorney is incorporated herein by reference to Exhibit B 
to the Schedule 13G filed by FMR LLC on June 10, 2014, accession number: 
0000315066-14-003512.


Exhibit A
 

                 5,342,240 of the shares of Class B
Common Stock of Castlight Health, Inc. reported as being beneficially owned
by the reporting persons at November 28, 2014, are included in this Schedule
13G because the reporting persons are deemed to beneficially own such shares
as a result of the direct ownership of 5,342,240 shares of Class A Common
Stock of Castlight Health, Inc. by investment companies advised by Fidelity
Management & Research Company and Pyramis Global Advisors Trust Company,
both of which are wholly-owned subsidiaries of FMR LLC, which shares of
Class A Common Stock are convertible into shares of Class B Common Stock at
the election of the holder at an exchange rate of 1:1.  Assuming the 
conversion of all outstanding shares of Class A Common Stock into Class B 
Common Stock, the 9,459,941 shares of Class B Common Stock reported as 
being beneficially owned by the reporting persons in this Schedule 13G 
would represent 10.48% of the outstanding Class B Common Stock.

		Pursuant to the instructions in Item 7 of Schedule 13G, 
the following table lists the identity and Item 3 classification, if 
applicable, of each relevant entity that beneficially owns shares of the 
security class being reported on this Schedule 13G.

 
Entity 	ITEM 3 Classification
FMR CO., INC * 	IA
PYRAMIS GLOBAL ADVISORS TRUST COMPANY 	BK
  	 
  	 
* Entity beneficially owns 5% or greater of the outstanding shares of the 
security class being reported on this Schedule 13G.
 
 

                Edward C. Johnson 3d is a Director and the Chairman of FMR 
LLC and Abigail P. Johnson is a Director, the Vice Chairman, the Chief 
Executive Officer and the President of FMR LLC.

 

                Members of the family of Edward C. Johnson 3d, including 
Abigail P. Johnson, are the predominant owners, directly or through trusts, 
of Series B voting common shares of FMR LLC, representing 49% of the voting 
power of FMR LLC. The Johnson family group and all other Series B 
shareholders have entered into a shareholders' voting agreement under which 
all Series B voting common shares will be voted in accordance with the 
majority vote of Series B voting common shares. Accordingly, through their 
ownership of voting common shares and the execution of the shareholders' 
voting agreement, members of the Johnson family may be deemed, under the 
Investment Company Act of 1940, to form a controlling group with respect to 
FMR LLC.

 

                Neither FMR LLC nor Edward C. Johnson 3d nor Abigail P. 
Johnson has the sole power to vote or direct the voting of the shares owned 
directly by the various investment companies registered under the 
Investment Company Act ("Fidelity Funds") advised by Fidelity Management & 
Research Company ("FMR Co"), a wholly owned subsidiary of FMR LLC, which 
power resides with the Fidelity Funds' Boards of Trustees. Fidelity 
Management & Research Company carries out the voting of the shares under 
written guidelines established by the Fidelity Funds' Boards of Trustees.

 

                This filing reflects the securities beneficially owned, or 
that may be deemed to be beneficially owned, by FMR LLC, certain of its 
subsidiaries and affiliates, and other companies (collectively, the "FMR 
Reporters"). This filing does not reflect securities, if any, beneficially 
owned by certain other companies whose beneficial ownership of securities 
is disaggregated from that of the FMR Reporters in accordance with 
Securities and Exchange Commission Release No. 34-39538 (January 12, 1998).

 
RULE 13d-1(k)(1) AGREEMENT
 

                The undersigned persons, on December 9, 2014, agree and 
consent to the joint filing on their behalf of this Schedule 13G in 
connection with their beneficial ownership of the CLASS B COMMON STOCK of 
CASTLIGHT HEALTH INC at November 28, 2014.

 
  	FMR LLC
 
  	By /s/ Scott C. Goebel
  	Scott C. Goebel
  	Duly authorized under Power of Attorney effective as of June 1, 2008, by 
and on behalf of FMR LLC and its direct and indirect subsidiaries*
 
  	Edward C. Johnson 3d
 
  	By /s/ Scott C. Goebel
  	Scott C. Goebel
  	Duly authorized under Power of Attorney effective as of June 1, 2008, by 
and on behalf of Edward C. Johnson 3d*
 
  	Abigail P. Johnson
 
  	By /s/ Scott C. Goebel
  	Scott C. Goebel
  	Duly authorized under Power of Attorney effective as of April 24, 2014, 
by and on behalf of Abigail P. Johnson*
 
  	Fidelity Growth Company Fund
 
  	By /s/ Scott C. Goebel
  	Scott C. Goebel
  	Secretary
 
  	Select Health Care Portfolio
 
  	By /s/ Scott C. Goebel
  	Scott C. Goebel
  	Secretary


* This power of attorney is incorporated herein by reference to Exhibit B 
to the Schedule 13G filed by FMR LLC on June 10, 2014, accession number: 
0000315066-14-003512.

   



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