BRADY MICHAEL JOHN (See Remarks) exercised options at SUMMIT MATERIALS, INC.

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

M · 3 exercises

BRADY MICHAEL JOHN

Filed: 3/2/2021ACC: 0001104659-21-030928

InsiderBRADY MICHAEL JOHNCIK 1636198

→

IssuerSUMMIT MATERIALS, INC.CIK 1621563

Officer· See Remarks

Since Feb 2019

-5.10K

Net shares

Net seller

$141.3K

Total sold

Open market trades

0B · 0S

Total transactions

15.04K acquired · 20.14K disposed

Non-Derivative Transactions4

Class A Common Stock

Direct

M · Option Exercise

+3.33K

Price / share

—

Trade value

—

% of position

15.2%

2/28/2021

21.93K→25.26K

Class A Common Stock

Direct

M · Option Exercise

+6.99K

Price / share

—

Trade value

—

% of position

27.7%

2/28/2021

25.26K→32.25K

Class A Common Stock

Direct

M · Option Exercise

+4.72K

Price / share

—

Trade value

—

% of position

14.6%

2/28/2021

32.25K→36.97K

Class A Common Stock

Direct

F · Tax Withholding

−5.10K

Price / share

$27.71

Trade value

$141.29K

% of position

13.8%

2/28/2021

36.97K→31.87K

Total

Net shares

+9.94K

Net value

-$141.29K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	2/28/2021	M · Option Exercise	+3.33K	—	—	15.2%	21.93K	25.26K
Class A Common Stock Direct	2/28/2021	M · Option Exercise	+6.99K	—	—	27.7%	25.26K	32.25K
Class A Common Stock Direct	2/28/2021	M · Option Exercise	+4.72K	—	—	14.6%	32.25K	36.97K
Class A Common Stock Direct	2/28/2021	F · Tax Withholding	−5.10K	$27.71	$141.29K	13.8%	36.97K	31.87K
Total			+9.94K		-$141.29K

Derivative Transactions3

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

3.33K shares

−3.33K

Strike price

Held after

0.00

Exercisable

—

2/28/2021

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

6.99K shares

−6.99K

Strike price

Held after

6.99K

Exercisable

—

2/28/2021

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

4.72K shares

−4.72K

Strike price

Held after

9.45K

Exercisable

—

2/28/2021

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Restricted Stock Units Direct	Class A Common Stock3.33K shares	2/28/2021	M · Option Exercise	−3.33K	—	0.00
Restricted Stock Units Direct	Class A Common Stock6.99K shares	2/28/2021	M · Option Exercise	−6.99K	—	6.99K
Restricted Stock Units Direct	Class A Common Stock4.72K shares	2/28/2021	M · Option Exercise	−4.72K	—	9.45K