Sec Form 4 Filing - 40 North Latitude Fund LP @ MATTRESS FIRM HOLDING CORP. - 2016-07-19

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 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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1. Name and Address of Reporting Person 40 North Latitude Fund LP 2. Issuer Name and Ticker or Trading Symbol MATTRESS FIRM HOLDING CORP. [ MFRM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 9 WEST 57TH STREET, 30TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 07/19/2016 (Street) NEW YORK, NY10019 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 Common Stock, $0.01 par value 07/19/2016 P 78,310 A $ 30.64 1,564,727 I By 40 North Latitude Master Fund Ltd. ( 1 ) ( 2 ) ( 3 ) Common Stock, $0.01 par value 2,499,256 I By 40 North Latitude SPV-B LLC ( 1 ) ( 2 ) ( 3 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 40 North Latitude Fund LP 9 WEST 57TH STREET 30TH FLOOR NEW YORK, NY10019 X 40 NORTH LATITUDE MASTER FUND LTD. 9 WEST 57TH STREET 30TH FLOOR NEW YORK, NY10019 X 40 NORTH LATITUDE SPV-B LLC 9 WEST 57TH STREET 30TH FLOOR NEW YORK, NY10019 X 40 NORTH GP III LLC 9 WEST 57TH STREET 30TH FLOOR NEW YORK, NY10019 X WINTER DAVID S. 9 WEST 57TH STREET 30TH FLOOR NEW YORK, NY10019 X MILLSTONE DAVID J. 9 WEST 57TH STREET, 30TH FLOOR 30TH FLOOR NEW YORK, NY10019 X Signatures 40 North Latitude Fund LP, By: 40 North GP III LLC, By: /s/ David S. Winter, Principal, and /s/ David J. Millstone, Principal 07/21/2016 Signature of Reporting Person Date 40 North Latitude Master Fund Ltd., By: /s/ David S. Winter, Director, and /s/ David J. Millstone, Director 07/21/2016 Signature of Reporting Person Date 40 North Latitude SPV-B LLC, By: /s/ David S. Winter, Principal, and /s/ David J. Millstone, Principal 07/21/2016 Signature of Reporting Person Date 40 North GP III LLC, By: /s/ David S. Winter, Principal, and /s/ David J. Millstone, Principal 07/21/2016 Signature of Reporting Person Date /s/ David S. Winter 07/21/2016 Signature of Reporting Person Date /s/ David J. Millstone 07/21/2016 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In addition to 40 North Latitude Fund LP, a Delaware limited partnership ("40 North Latitude Feeder"), this Form 4 is being filed jointly by 40 North Latitude Master Fund Ltd., a Cayman Islands exempted company incorporated with limited liability ("40 North Latitude Master"), 40 North Latitude SPV-B LLC, a Delaware limited liability company ("40 North Latitude SPV"), 40 North GP III LLC, a Delaware limited liability company ("40 North GP III"), David S. Winter, an American citizen, and David J. Millstone, an American citizen (all of the foregoing, collectively, the "Reporting Persons"), each of whom has the same business address as 40 North Latitude Feeder. ( 2 )The securities reported on this Form 4 (the "Subject Securities") are held directly by (a) 40 North Latitude Master, for which 40 North Latitude Feeder serves as a feeder fund (1,564,727 shares), and (b) 40 North Latitude SPV, a subsidiary of 40 North Latitude Master (2,499,256 shares). 40 North GP III is the general partner of 40 North Latitude Feeder, and Messrs. Winter and Millstone are the principals of 40 North GP III and 40 North Latitude SPV. ( 3 )40 North Latitude SPV, 40 North Latitude Master and 40 North Latitude Feeder, as pooled investment vehicles with direct and indirect holdings, respectively, in the Subject Securities; 40 North GP III, as the general partner of 40 North Latitude Feeder; and Messrs. Winter and Millstone, as the principals of 40 North GP III; in each case, may be deemed to beneficially own the Subject Securities for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended. Each of the Reporting Persons disclaims beneficial ownership of the Subject Securities except to the extent of any pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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