Blackstone Inc. — Director's Dealing 2016

Apr 21, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Summit Materials, Inc. (SUM)
CIK: 0001621563
Period of Report: 2016-04-19

Reporting Person: Blackstone Holdings II L.P. (10% Owner)
Reporting Person: Blackstone Holdings I/II GP Inc (10% Owner)
Reporting Person: Blackstone Group L.P. (10% Owner)
Reporting Person: Blackstone Group Management L.L.C. (10% Owner)
Reporting Person: SCHWARZMAN STEPHEN A (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-04-19	Class A Common Stock	C	7523988	—	Acquired	7523988	Indirect
2016-04-19	Class A Common Stock	S	7523988	$20.00	Disposed	0	Indirect
2016-04-19	Class A Common Stock	C	1586120	—	Acquired	1586120	Indirect
2016-04-19	Class A Common Stock	S	1586120	$20.00	Disposed	0	Indirect
2016-04-19	Class A Common Stock	C	143097	—	Acquired	143097	Indirect
2016-04-19	Class A Common Stock	S	143097	$20.00	Disposed	0	Indirect
2016-04-19	Class A Common Stock	C	12126	—	Acquired	12126	Indirect
2016-04-19	Class A Common Stock	S	12126	$20.00	Disposed	0	Indirect
2016-04-19	Class A Common Stock	C	7047	—	Acquired	7047	Indirect
2016-04-19	Class A Common Stock	S	7047	$20.00	Disposed	0	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-04-19	LP Units of Summit Materials Holdings L.P.	$	C	7523988	Disposed		Class A Common Stock (7523988)	Indirect
2016-04-19	LP Units of Summit Materials Holdings L.P.	$	C	1586120	Disposed		Class A Common Stock (1586120)	Indirect
2016-04-19	LP Units of Summit Materials Holdings L.P.	$	C	143097	Disposed		Class A Common Stock (143097)	Indirect
2016-04-19	LP Units of Summit Materials Holdings L.P.	$	C	12126	Disposed		Class A Common Stock (12126)	Indirect
2016-04-19	LP Units of Summit Materials Holdings L.P.	$	C	7047	Disposed		Class A Common Stock (7047)	Indirect

Footnotes

F1: Pursuant to the terms of an exchange agreement, dated as of March 11, 2015, limited partnership units of Summit Materials Holdings L.P. ("LP Units") held by the Reporting Persons are exchangeable for shares of the issuer's Class A common stock ("Common Stock") on a one-for-one basis.

F2: This amount represents the $20.15 public offering price per share of Common Stock, less the underwriting discount of $0.15 per share of Common Stock.

F3: Reflects securities of the issuer held directly by Blackstone Capital Partners (Delaware) V-NQ L.P.

F4: Reflects securities of the issuer held directly by Blackstone Capital Partners (Delaware) NQ V-AC L.P.

F5: Reflects securities of the issuer held directly by Summit BCP Intermediate Holdings L.P. The general partner of Summit BCP Intermediate Holdings L.P. is Summit BCP Intermediate Holdings GP, Ltd. Summit BCP Intermediate Holdings GP, Ltd. is owned by Blackstone Capital Partners (Delaware) V-NQ L.P., Blackstone Capital Partners (Delaware) NQ V-AC L.P., Blackstone Family Investment Partnership (Delaware) V-NQ L.P. and Blackstone Participation Partnership (Delaware) V-NQ L.P.

F6: Reflects securities of the issuer held directly by Blackstone Family Investment Partnership (Delaware) V-NQ L.P.

F7: Reflects securities of the issuer held directly by Blackstone Participation Partnership (Delaware) V-NQ L.P. (collectively with Blackstone Capital Partners (Delaware) V-NQ L.P., Blackstone Capital Partners (Delaware) NQ V-AC L.P., Summit BCP Intermediate Holdings L.P. and Blackstone Family Investment Partnership (Delaware) V-NQ L.P., the "Blackstone Funds").

F8: The general partner of each of Blackstone Capital Partners (Delaware) V-NQ L.P. and Blackstone Capital Partners (Delaware) NQ V-AC L.P. is Blackstone Management Associates (Cayman) V-NQ L.P. The general partners of each of Blackstone Management Associates (Cayman) V-NQ L.P., Blackstone Family Investment Partnership (Delaware) V-NQ L.P. and Blackstone Participation Partnership (Delaware) V-NQ L.P. are Blackstone LR Associates (Cayman) V-NQ Ltd. and BCP V-NQ GP L.L.C.

F9: Blackstone Holdings II L.P. is the sole member of BCP V-NQ GP L.L.C. and the controlling shareholder of Blackstone LR Associates (Cayman) V-NQ Ltd. The general partner of Blackstone Holdings II L.P. is Blackstone Holdings I/II GP Inc. The sole shareholder of Blackstone Holdings I/II GP Inc. is The Blackstone Group L.P. The general partner of The Blackstone Group L.P. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly owned by Blackstone's senior managing directors and controlled by its founder, Stephen A. Schwarzman.

F10: Due to the limitations of the electronic filing system Blackstone Capital Partners (Delaware) V-NQ L.P., Blackstone Capital Partners (Delaware) NQ V-AC L.P., Summit BCP Intermediate Holdings L.P., Summit BCP Intermediate Holdings GP, Ltd., Blackstone Family Investment Partnership (Delaware) V-NQ L.P., Blackstone Participation Partnership (Delaware) V-NQ L.P., Blackstone Management Associates (Cayman) V-NQ L.P., BCP V-NQ GP L.L.C. and Blackstone LR Associates (Cayman) V-NQ Ltd. are filing a separate Form 4.

F11: Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person has responsibility for the accuracy or completeness of information supplied by another Reporting Person.

F12: Each of the Reporting Persons (other than the Blackstone Funds to the extent they directly hold securities reported herein), disclaims beneficial ownership of the securities held by the Blackstone Funds, except to the extent of such Reporting Person's pecuniary interest therein, if any, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, each of the Reporting Persons (other than the Blackstone Funds to the extent they directly hold securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.