Michael Cloonan

Michael Cloonan is the founder of Sionna Therapeutics. Sionna Therapeutics has raised $500M, latest IPO $219M (2025). Biotech · Waltham, MA.

About Michael Cloonan

Michael Cloonan is the founder of Sionna Therapeutics. Sionna Therapeutics operates in Biotech and is based in Waltham, MA. Sionna Therapeutics has raised $500M, latest IPO $219M (2025). Backers on record include David Grayzel, Atlas Venture.

Michael Cloonan at a glance

Company
Sionna Therapeutics
Industry
Biotech
Location
Waltham, MA
Total raised
$500M
Investors on record
David Grayzel, Atlas Venture

Frequently asked about Michael Cloonan

Who is Michael Cloonan?
Michael Cloonan is the founder of Sionna Therapeutics. Full profile, funding history and background on StartupFundraising.com.
What company did Michael Cloonan found?
Michael Cloonan founded Sionna Therapeutics, a Biotech company based in Waltham, MA.
How do I contact Michael Cloonan?
Verified contact routes including LinkedIn, background and funding history for Michael Cloonan are available on the StartupFundraising.com founder profile.

This founder profile draws on disclosed rounds, filings and investor records in the StartupFundraising database and is updated as new funding is recorded. Founders raising now use profiles like this one to study comparable Biotech journeys in Waltham — who backed them, at what stage, and how much they raised.

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