Where is Sierra Oncology located?

USA - Global Headquarters

1820 Gateway Drive
Suite 110
San Mateo, CA 94404
(650) 376-8679

Canada

355 Burrard Street
Suite 1000
Vancouver, BC V6C 2G8
(604) 558-6536

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Who can I contact if I am a member of the media?

For media inquiries, please send an email to media@sierraoncology.com

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Where can I find recent Sierra Oncology press releases?

You can view our recent press releases by visiting the Investor section of our website.

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How can I get a copy of your Annual Report or other periodic reports?

Electronic copies of our Annual Report and other periodic reports, are available in the Financial Reporting section in the Investor Section of our corporate website. Additionally, all SEC filings can also be accessed directly from the SEC at www.sec.gov.

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How do I report a change of mailing address on my stockholder account?

You must send both your old and new addresses to our transfer agent, American Stock Transfer, http://www.amstock.com/main/nav_contactUs.asp, by mail. Each stockholder in question must sign the request for an address change.

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How can I replace my lost stock certificates?

There is no need to replace lost stock certificates. Following Sierra Oncology’s initial public offering, all physical stock certificates were deemed void and the shares represented by the stock certificates were reflected in an electronic book entry account set up for you with our transfer agent, American Stock Transfer (AST). For questions about how many shares you hold, please contact AST at: http://www.amstock.com/main/nav_contactUs.asp. AST can look up your records and provide information about your shares.

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Where is Sierra Oncology incorporated?

Sierra Oncology was incorporated in Delaware in May 2003 as Phenome Systems, Inc. and our name was changed to Sierra Oncology, Inc. in January 2017.

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What is Sierra Oncology's CUSIP number?

Sierra Oncology’s CUSIP number is 82640U107.

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Does Sierra Oncology pay dividends?

Sierra Oncology has never declared or paid cash or stock dividends on its common stock. Sierra Oncology anticipates to retain all available funds and any future earnings, if any, for use in the operation of its business and does not anticipate paying dividends in the foreseeable future.

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Does Sierra Oncology have a direct stock purchase plan?

Sierra Oncology does not offer a direct stock purchase plan.

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How can I purchase shares?

Shares can be purchased through a stockbroker of your choice.

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Who is Sierra Oncology's independent registered public accounting firm?

Deloitte & Touche LLP is Sierra Oncology’s independent registered public accounting firm.

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When is Sierra Oncology's fiscal year-end?

Sierra Oncology’s fiscal year-end is December 31.

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Who are the members of Sierra Oncology's Board of Directors?

You can view our Board of Directors by visiting the Directors section of our website.

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Who is Sierra Oncology's transfer agent and how do I contact them?

Sierra Oncology’s transfer agent is American Stock Transfer and Trust Company, LLC (AST). You can find more information about how to contact AST at: http://www.amstock.com/main/nav_contactUs.asp.

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Who are the members of Sierra Oncology's management team?

You can view our management team by visiting the Leadership section of our website.

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On which exchange is Sierra Oncology listed and what is the ticker symbol?

Sierra Oncology’s common stock is traded on the NASDAQ Global Market under the ticker symbol “SRRA”.

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When did Sierra Oncology go public?

Sierra Oncology’s initial public offering was on July 16, 2015.

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How can I sign up to receive Sierra Oncology's press releases and other company information?

Please visit the Investor Alerts section of our corporate website.

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