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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
1295674	Christina Mary Thomson	C/O Sierra Oncology, Inc. 1820 Gateway Drive, Suite 110 San Mateo CA 94404	General Counsel & Secretary	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	2022-01-26	2,000	$13.04	2,000	No	4	M	Direct
Common Stock	Disposition	2022-01-26	2,000	$29.00	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	2022-01-26	2,000	$0.00	2,000	$13.04
Common Stock	Stock Option (Right to Buy)	Acquisiton	2022-01-28	12,250	$0.00	12,250	$12.15

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2030-07-28	No	4	M	Direct
12,250	2022-01-28	2030-08-12	No	4	A	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 21, 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 July 28, 2021, the option vested as to 25% of the total shares granted on July 28, 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 July 28, 2024, subject to the Reporting Person's provision of service to the Issuer on each vesting date.
On August 12, 2020, the Reporting Person was granted an option to purchase 49,000 shares of common stock. The option vests based on the satisfaction by Issuer of certain performance criteria. The achievement of one of the performance criteria resulted in vesting of the option as to 12,250 shares.