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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1290149	Sierra Oncology Inc.	SRRA	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1819688	D. William Turner	C/O Sierra Oncology, Inc. 1820 Gateway Drive, Suite 110 San Mateo CA 94404	Chief Reg & Tech Ops Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2022-02-07	10,000	$12.05	10,000	No	4	M	Direct
Common Stock	Disposition	2022-02-07	10,000	$32.32	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Acquisiton	2022-02-07	10,000	$0.00	10,000	$12.05

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2030-08-04	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on January 23, 2022. The Reporting Person is subject to a Lock-Up Letter Agreement that expires on April 26, 2022. The sale of shares is a permissible exemption under the terms of the Lock-Up Letter Agreement.
On August 4, 2021, the option vested as to 25% of the total shares granted on August 4, 2020, with the remaining shares from that grant vesting in equal monthly installments over the following 36 months, with 100% of the total shares vested on August 4, 2024, subject to the Reporting Person's provision of service to the Issuer on each vesting date.