Capital World Investors – ‘SC 13G/A’ on 12/9/14 re: Castlight Health, Inc.

On:  Tuesday, 12/9/14, at 5:51pm ET   ·   As of:  12/10/14   ·   Accession #:  1422849-14-313   ·   File #:  5-88076

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Amendment to Statement of Beneficial Ownership   —   Schedule 13G
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: SC 13G/A    Amendment to Statement of Beneficial Ownership         4     13K 

Document Table of Contents

SC 13G/A
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UNITED STATES         
SECURITIES AND EXCHANGE COMMISSION          
Washington, D.C. 20549          

SCHEDULE 13G          

Under the Securities Exchange Act of 1934         

(Amendment No. 1)*          

Castlight Health, Inc.      
(Name of Issuer)      

Class B Common Stock      
(Title of Class of Securities)      

14862Q100       
(CUSIP Number)      

November 28, 2014       
(Date of Event Which Requires Filing of this Statement)       

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)                                                               

*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: 14862Q100                                                Page 1 of 5     

SC 13G/A
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1   NAMES OF REPORTING PERSONS                                                
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)           
Capital World Investors **                                            

2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE                     
INSTRUCTIONS)                                                 (a)     

                                                           (b)
3   SEC USE ONLY                                                              

4   CITIZENSHIP OR PLACE OF ORGANIZATION                                      

Delaware                                                              

5   SOLE VOTING POWER                                 

1,729,167                                   

6   SHARED VOTING POWER                               
NUMBER OF                                                                     
SHARES         NONE                                                       
BENEFICIALL                                                                     
Y OWNED BY                                                                    
7   SOLE DISPOSITIVE POWER                            
EACH                                                                    
REPORTING        1,729,167                                                    
PERSON                                                                    
WITH:                                                                     
8   SHARED DISPOSITIVE POWER                          

NONE                                        

9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              

1,729,167          Beneficial ownership disclaimed pursuant to Rule   
13d-4                                                                 

10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES      
(SEE INSTRUCTIONS)                                                    

11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           

5.6%                                                                  

12  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)                               

IA                                                                    

** A division of Capital Research and Management Company (CRMC)                 

CUSIP: 14862Q100                                                Page 2 of 5     

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SECURITIES AND EXCHANGE COMMISSION          
Washington, DC 20549          

Schedule 13G          
Under the Securities Exchange Act of 1934         

Amendment No. 1                                                                 

Item 1(a)     Name of Issuer:                                                   
Castlight Health, Inc.                                            

Item 1(b)     Address of Issuer's Principal Executive Offices:                  
121 Spear Street, Suite 300                                       
San Francisco, CA 94105                                           

Item 2(a)     Name of Person(s) Filing:                                         
Capital World Investors                                           

Item 2(b)     Address of Principal Business Office or, if none,                 
Residence:                                                        
333 South Hope Street                                             
Los Angeles, CA 90071                                             

Item 2(c)     Citizenship:   N/A                                                

Item 2(d)     Title of Class of Securities:                                     
Class B Common Stock                                              

Item 2(e)     CUSIP Number:                                                     
14862Q100                                                         

Item 3     If this statement is filed pursuant to sections 240.13d-1(b)         
or 240.13d-2(b) or (c), check whether the person filing is a:     
(e)      [X]     An investment adviser in accordance with         
section 240.13d-1(b)(1)(ii)(E).                         

Item 4     Ownership                                                            

Provide the following information regarding the aggregate         
number and percentage of the class of securities of the issuer    
identified in Item 1.                                             

(a)    Amount beneficially owned:                                 
(b)    Percent of class:                                          
(c)    Number of shares as to which the person has:               
(i)    Sole power to vote or to direct the vote:                  
(ii)   Shared power to vote or to direct the vote:                
(iii)  Sole power to dispose or to direct the disposition of:     
(iv)   Shared power to dispose or to direct the disposition of:   

See page 2                                                        

Capital World Investors is deemed to be the beneficial owner of   
1,729,167 shares or 5.6% of the 30,705,200 shares believed to     
be outstanding as a result of CRMC acting as investment adviser   
to various investment companies registered under Section 8 of     
the Investment Company Act of 1940.                               

CUSIP: 14862Q100                                                Page 3 of 5     

SC 13G/A
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Item 5     Ownership of Five Percent or Less of a Class.  If this               
statement is being filed to report the fact that as of the date   
hereof the reporting person has ceased to be the beneficial       
owner of more than five percent of the class of securities,       
check the following: [ ]                                          

Item 6     Ownership of More than Five Percent on Behalf of Another             
Person: One or more clients of Capital World Investors have the   
right to receive or the power to direct the receipt of            
dividends from, or the proceeds from the sale of, the Class B     
Common Stock of Castlight Health, Inc..  Capital World            
Investors holds more than five percent of the outstanding Class   
B Common Stock of Castlight Health, Inc. as of November 28,       
2014 on behalf of each of the following client(s):                

SMALLCAP World Fund, Inc.                                         

Item 7     Identification and Classification of the Subsidiary Which            
Acquired the Security Being Reported on By the Parent Holding     
Company or Control Person: N/A                                    

Item 8     Identification and Classification of Members of the Group:           
N/A                                                               

Item 9     Notice of Dissolution of Group:  N/A                                 

Item 10     Certification                                                       

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.                          

Date:          December 8, 2014                                 

Signature:     Alan Berro***                                    
Name/Title:    Alan Berro - Senior Vice President               
Capital World Investors           

***By  /s/ Michael J. Triessl                                   
Michael J. Triessl                                
Attorney-in-fact                                  

Signed pursuant to a Power of Attorney dated September 18,  
2014 included as Exhibit to the Schedule 13G filed with the 
 Securities and Exchange Commission by Capital World Investors
on November 7, 2012 with respect to Castlight Health Inc.   
CUSIP: 14862Q100                                                Page 4 of 5     

CUSIP: 14862Q100                                                Page 5 of 5     

Dates Referenced Herein   and   Documents Incorporated by Reference

				Referenced-On Page
This ‘SC 13G/A’ Filing		Date		First		Last			Other Filings
Filed as of:		12/10/14
Filed on:		12/9/14
		12/8/14		4					SC 13G/A
		11/28/14		1		4
		9/18/14		4
		11/7/12		4
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