DEPRIEST CHARLES (See remarks) exercised options at SUMMIT MATERIALS, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 4 exercises

DEPRIEST CHARLES

Filed: 12/26/2024ACC: 0001628280-24-052433

InsiderDEPRIEST CHARLESCIK 2006491

→

IssuerSUMMIT MATERIALS, INC.CIK 1621563

Officer· See remarks

Since Jan 2024

-7.39K

Net shares

Net seller

$373.1K

Total sold

Open market trades

0B · 0S

Total transactions

16.38K acquired · 23.77K disposed

Non-Derivative Transactions5

Class A Common Stock

Direct

M · Option Exercise

+794.00

Price / share

—

Trade value

—

% of position

6.9%

12/20/2024

11.47K→12.27K

Class A Common Stock

Direct

M · Option Exercise

+305.00

Price / share

—

Trade value

—

% of position

2.5%

12/20/2024

12.27K→12.57K

Class A Common Stock

Direct

M · Option Exercise

+4.20K

Price / share

—

Trade value

—

% of position

33.4%

12/20/2024

12.57K→16.77K

Class A Common Stock

Direct

M · Option Exercise

+11.08K

Price / share

—

Trade value

—

% of position

66.1%

12/20/2024

16.77K→27.85K

Class A Common Stock

Direct

F · Tax Withholding

−7.39K

Price / share

$50.50

Trade value

$373.14K

% of position

26.5%

12/20/2024

27.85K→20.46K

Total

Net shares

+8.99K

Net value

-$373.14K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	12/20/2024	M · Option Exercise	+794.00	—	—	6.9%	11.47K	12.27K
Class A Common Stock Direct	12/20/2024	M · Option Exercise	+305.00	—	—	2.5%	12.27K	12.57K
Class A Common Stock Direct	12/20/2024	M · Option Exercise	+4.20K	—	—	33.4%	12.57K	16.77K
Class A Common Stock Direct	12/20/2024	M · Option Exercise	+11.08K	—	—	66.1%	16.77K	27.85K
Class A Common Stock Direct	12/20/2024	F · Tax Withholding	−7.39K	$50.50	$373.14K	26.5%	27.85K	20.46K
Total			+8.99K		-$373.14K

Derivative Transactions4

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

794.00 shares

−794.00

Strike price

Held after

0.00

Exercisable

—

12/20/2024

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

305.00 shares

−305.00

Strike price

Held after

0.00

Exercisable

—

12/20/2024

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

4.20K shares

−4.20K

Strike price

Held after

0.00

Exercisable

—

12/20/2024

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

11.08K shares

−11.08K

Strike price

Held after

0.00

Exercisable

—

12/20/2024

Security	Converts To	Date	Type	Shares	Exercisable
Restricted Stock Units Direct	Class A Common Stock794.00 shares	12/20/2024	M · Option Exercise	−794.00	—
Restricted Stock Units Direct	Class A Common Stock305.00 shares	12/20/2024	M · Option Exercise	−305.00	—
Restricted Stock Units Direct	Class A Common Stock4.20K shares	12/20/2024	M · Option Exercise	−4.20K	—
Restricted Stock Units Direct	Class A Common Stock11.08K shares	12/20/2024	M · Option Exercise	−11.08K	—