List of insiders holdings for Summit Materials, Inc.:
  1. Shares directly owned by the insider.
  2. Shares indirectly owned by the insider.
  3. Total shares owned by the insider (sum of shares directly and indirectly owned).
  4. Total market value if available.
  5. Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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Insider Holder NameReport
Date Time		Shares Owned
Directly
Indirectly		Total
Shares Owned		Filing
BARCLAYS PLC
10% Owner		2016-07-25 21:00:560
13,958,332		13,958,332Form 4
LONGLEAF PARTNERS FUNDS TRUST
10% Owner		2019-06-17 14:42:0412,699,444
0		12,699,444Form 3
SOUTHEASTERN ASSET MANAGEMENT INC
10% Owner		2019-12-10 16:00:145,117,610
0		5,117,610Form 13G
Hill Thomas W.
President & CEO		2020-07-22 18:00:32468,372
226,969		695,341Form 4
Harris Brian James
EVP & Chief Financial Officer		2023-03-01 17:40:00235,581
0		235,581Form 4
Noonan Anne P
President & CEO		2023-03-01 17:39:04218,086
0		218,086Form 4
Kennedy Michael N.
Sr. V.P. Finance		2016-12-16 16:56:55201,449
0		201,449Form 4
Murphy Damian John
EVP & East Division President		2017-12-13 20:10:04156,001
1848		157,849Form 4
Rauh Douglas Charles
See Remarks		2017-11-03 18:02:14107,917
0		107,917Form 4
Benedict Anne Lee
See Remarks		2021-03-22 21:20:0073,585
0		73,585Form 4
Brady Michael John
See Remarks		2021-03-02 19:25:5248,307
0		48,307Form 4
Beck Thomas A.
See Remarks		2019-03-04 20:00:4141,837
0		41,837Form 4
CANTIE JOSEPH S
Director		2023-03-01 17:35:4635,085
5100		40,185Form 4
WUNNING STEVEN H
Director		2023-03-01 17:30:4134,455
0		34,455Form 4
Gaskill Christopher Burke
See Remarks		2023-03-01 17:41:0434,169
0		34,169Form 4
Watson Karl
EVP & Chief Operating Officer		2019-03-04 20:03:2628,602
0		28,602Form 4
GARDNER TED A
Director		2020-03-03 21:38:1728,080
0		28,080Form 4
Anderson Karli S.
See Remarks		2023-03-01 17:42:0925,594
0		25,594Form 4
Wade Anne K.
Director		2023-03-01 17:36:4822,862
0		22,862Form 4
MURPHY JOHN RAYMOND
Director		2023-03-01 17:34:2117,225
0		17,225Form 4
MacMillan Deon
See Remarks		2022-03-11 16:20:5312,923
0		12,923Form 4
LANCE HOWARD L
Director		2023-03-01 17:32:2512,325
0		12,325Form 4
Anderson Craig Scott
EVP & Chief Financial Officer		2023-03-02 16:23:5311,213
0		11,213Form 4
Ghelani Kekin
Chief Strategy&Growth Officer		2023-02-24 18:08:2710,193
0		10,193Form 4
SIMPKINS NEIL P
Director		2018-03-01 21:02:108092
0		8092Form 4
Oates-Forney Tamla
Director		2023-03-01 17:38:007937
0		7937Form 4
Evans Mikel Shane
See Remarks		2019-11-05 17:02:056288
0		6288Form 4
Gill Kevin A
See Remarks		2017-02-28 20:22:266076
0		6076Form 4
Ellerbusch Susan A
Director		2023-02-24 18:17:044038
0		4038Form 4
Cooney Anne M
Director		2023-02-24 18:16:004038
0		4038Form 4
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.
Blackstone LR Associates (Cayman) V-NQ Ltd.
10% Owner		2016-11-18 18:00:540
0		0Form 4
Blackstone Holdings II L.P.
Blackstone Holdings I
Blackstone Group L.P.
Blackstone Group Management L.L.C.
SCHWARZMAN STEPHEN A
10% Owner		2017-02-14 14:45:320
0		0Form 13G
Kahr Julia
Director		2015-03-12 20:24:000
0		0Form 3