13G Filing: Maverick Capital and Castlight Health Inc. (CSLT)

Item 1(a)

Name of Issuer:

Castlight Health, Inc.

Item 1(b)

Address of Issuer’s Principal Executive Offices:

Two Rincon Center

121 Spear Street, Suite 300

San Francisco, California  94105

Item 2(a)

Name of Person Filing:

This Schedule 13G (the “Schedule 13G”) is being filed on behalf of each of the following persons (each, a “Reporting Person”):

(i)

Maverick Capital, Ltd.;

(ii)

Maverick Capital Management, LLC;

(iii)

Lee S. Ainslie III (“Mr. Ainslie”); and

(iv)

Andrew H. Warford (“Mr. Warford”).

The Schedule 13G relates to Shares (as defined herein) held for the accounts of Maverick Capital, Ltd.’s clients.

Item 2(b)

Address of Principal Business Office or, if none, Residence:

The address of the principal business office of (i) Maverick Capital, Ltd. and Maverick Capital Management, LLC is 300 Crescent Court, 18th Floor, Dallas, Texas 75201, and (ii) Mr. Ainslie and Mr. Warford is 767 Fifth Avenue, 11th Floor, New York, New York 10153.

Item 2(c)

Citizenship:

(i)

Maverick Capital, Ltd. is a Texas limited partnership;

(ii)

Maverick Capital Management, LLC is a Texas limited liability company;

(iii)

Mr. Ainslie is a citizen of the United States; and

(iv)

Mr. Warford is a citizen of the United States.

Item 2(d)

Title of Class of Securities:

Class B Common Stock, $0.0001 par value per share (the “Shares”).

Item 2(e)

CUSIP Number:

14862Q100