Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F5,F1,F2	Mar 22, 2016	P	43,238	$36.7846	A	3,860,364	I	See Footnotes
Common Stock^F5,F3	Mar 22, 2016	P	259	$36.7846	A	16,077	D
Common Stock^F5,F4	Mar 22, 2016	P	236	$36.7846	A	15,308	D
Common Stock^F6,F1,F2	Mar 22, 2016	P	44,260	$37.9871	A	3,904,624	I	See Footnotes
Common Stock^F6,F3	Mar 22, 2016	P	265	$37.9871	A	16,342	D
Common Stock^F6,F4	Mar 22, 2016	P	242	$37.9871	A	15,550	D
Common Stock^F7,F1,F2	Mar 22, 2016	P	31,397	$38.6166	A	3,936,021	I	See Footnotes
Common Stock^F7,F3	Mar 22, 2016	P	189	$38.6166	A	16,531	D
Common Stock^F7,F4	Mar 22, 2016	P	171	$38.6166	A	15,721	D
Common Stock^F8,F1,F2	Mar 22, 2016	P	177,707	$39.6062	A	4,113,728	I	See Footnotes
Common Stock^F8,F3	Mar 22, 2016	P	1,065	$39.6062	A	17,596	D
Common Stock^F8,F4	Mar 22, 2016	P	971	$39.6062	A	16,692	D
Common Stock^F9,F1,F2	Mar 23, 2016	P	164,845	$39.1082	A	4,278,573	I	See Footnotes
Common Stock^F9,F3	Mar 23, 2016	P	1,207	$39.1082	A	18,803	D
Common Stock^F9,F4	Mar 23, 2016	P	1,099	$39.1082	A	17,791	D

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1Represents shares that may be deemed to be indirectly beneficially owned by Berkshire Partners Holdings LLC ("BPH"), BPSP, L.P. ("BPSP"), Stockbridge Partners LLC ("SP") and Berkshire Partners LLC ("BP"). Berkshire Fund VIII, L.P. ("BF VIII") holds 1,200,531 shares of the Issuer's common stock, and Berkshire Fund VIII-A, L.P. ("BF VIII-A") holds 498,830 shares of the Issuer's common stock. Eighth Berkshire Associates LLC ("8BA") is the general partner of BF VIII and BF VIII-A. Stockbridge Fund, L.P. (f/k/a Stockbridge Special Situations Fund, L.P.) ("SF") holds 2,078,503 shares of the Issuer's common stock, Stockbridge Absolute Return Fund, L.P. ("SARF") holds 6,412 shares of the Issuer's common stock, Stockbridge Master Fund (OS), L.P. ("SOS") holds 187,154 shares of the Issuer's common stock and SP holds 507,952 shares of the Issuer's common stock on behalf of certain other accounts. Stockbridge Associates LLC ("SA") is the general partner of SF, SARF and SOS.
F2(Continued from Footnote 1) BPH is the general partner of BPSP, which is the managing member of each of SP, the registered investment adviser of SF, SARF and SOS as well certain other accounts holding shares of the Issuer, and BP, the registered investment adviser of BF VIII and BF VIII-A. As the managing member of SP and BP, BPSP may be deemed to beneficially own shares of common stock that are beneficially owned by SP and BP. As the general partner of BPSP, BPH may be deemed to beneficially own shares of common stock that are beneficially owned by BPSP. BPH, BPSP, BP, SP, 8BA and SA are under common control and may be deemed to be, but do not admit to being, a group for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the "Act"). Each of BPH, BPSP, BP, SP, 8BA and SA disclaims beneficial ownership of any securities except to the extent of its pecuniary interest therein.
F3Represents shares held directly by Berkshire Investors III LLC. Berkshire Investors III LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act.
F4Represents shares held directly by Berkshire Investors IV LLC. Berkshire Investors IV LLC may be deemed to be, but does not admit to being, a member of a group holding over 10% of the outstanding common stock of the Issuer for purposes of Section 13(d)(3) of the Act.
F5The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $36.3500 - $37.3499, inclusive. The reporting persons undertake to provide to Mattress Firm Holding Corp., any security holder of Mattress Firm Holding Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
F6The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $37.3500 - $38.3499, inclusive. The reporting persons undertake to provide to Mattress Firm Holding Corp., any security holder of Mattress Firm Holding Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
F7The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $38.3500 - $39.3499, inclusive. The reporting persons undertake to provide to Mattress Firm Holding Corp., any security holder of Mattress Firm Holding Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
F8The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $39.3500 - $39.8000, inclusive. The reporting persons undertake to provide to Mattress Firm Holding Corp., any security holder of Mattress Firm Holding Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
F9The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $38.4450 - $39.4449, inclusive. The reporting persons undertake to provide to Mattress Firm Holding Corp., any security holder of Mattress Firm Holding Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Remarks

Form 1 of 2