Investor FAQs

Where is Sionna headquartered?

21 Hickory Drive, Suite 500, Waltham, MA 02451

Where is Sionna incorporated?

Sionna is incorporated in Delaware

When was Sionna founded?

Sionna was founded in 2019

When did Sionna go public?

Sionna’s initial public offering (IPO) was consummated on February 10, 2025

When does Sionna’s fiscal year end?

Sionna’s fiscal year ends on December 31st

Which stock exchange are Sionna shares traded on and what is the company’s ticker?

Sionna’s shares are traded on the Nasdaq Global Market under the symbol “SION”

What is Sionna’s CUSIP number?

829401108

How can I purchase Sionna shares?

Shares of Sionna can be purchased through a broker of your choice

Does Sionna pay dividends?

Sionna does not expect to pay dividends to its stockholders in the foreseeable future

Does Sionna have a dividend reinvestment program?

Who is Sionna’s transfer agent?

Computershare Trust Company, N.A.
150 Royall Street
Canton, MA 02021
www.computershare.com

Whom do I contact with questions about my stock? How do I transfer stock, change the address on my shareholder account, or replace a lost stock certificate?

For questions about your stock please contact our transfer agent, Computershare

How can I view documents Sionna has filed with the Securities & Exchange Commission (SEC), including Forms 10-K and 10-Q?

Quarterly & Annual reports and other investor materials are available in the “Investors” section of Sionna’s corporate website. Additionally, all SEC filings can be accessed directly from the SEC at www.sec.gov

Who is Sionna’s independent auditor?

Deloitte & Touche LLP
115 Federal Street, Winthrop Center
Boston, MA 02110

Where can I get the latest corporate news releases and financial reports?

You may subscribe to email alerts here

Whom should I contact if I am a member of the media?

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

Whom should I contact regarding investor inquiries?

For investor inquiries, please send an email to IR@sionnatx.com

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