Michael Cloonan

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.

Sionna Therapeutics funding profile (1)

• Sionna Therapeutics funding: total raised, rounds and investors

More Biotech founders (40)

• Cajal Neuroscience Team — Cajal Neuroscience
• Carlo Centonze — HeiQ Materials
• Carlos Reines — Unlearn.AI
• Carrie Chan — Avant Meats
• Catherine Pearce — AllRock Bio
• Celine Halioua — Loyal
• Charles Baum — Terremoto Biosciences
• Charles Henry — Burst Diagnostics
• Charlie Granfelt — WellFish Tech
• Chip Clark — Altido Therapeutics
• Chris Garabedian — Revolution Medicines
• Chris Loose — Progentos Therapeutics
• Christian Apfel — SageMedic
• Christopher A. Kroeger — MapLight Therapeutics
• Christopher M. Burns — VelosBio
• Christoph Müller — Amprion
• Cian Duggan — Resurrect Bio
• Claudio De Luca — NanoPhoria
• Connor Glass — Phantom Neuro
• Aaron Fletcher — Bios Partners portfolio companies (Actuate Therapeutics)
• Abraham Ceesay — Rapport Therapeutics
• Adam Friedman — Scorpion Therapeutics
• Adam Rosenthal — Star Therapeutics
• Adam Szaronos — Iantrek
• Adaptyx Team — Adaptyx Biosciences
• Adrian Gottschalk — Foghorn Therapeutics
• Agnese Stunda-Zujeva — SpirulinaNord
• Ajay Kshatriya — Aizen Therapeutic
• Alain Wille — Animab
• Alan Rigby — Epitopea
• Alexander Lorestani — Geltor
• Alexandria Forbes — MeiraGTx Holdings plc
• Alex Frommeyer — Beam
• Alex Leech — Forth Therapeutics
• Alex Telford — Convoke
• Alon Kushnir — RedDress
• Amine Raji — Spore Biotechnologies
• Amy Divaraniya — OOVA
• Anastasia Krivoruchko — Melt&Marble
• Anders Klein — Ousia Pharma

Browse related founder lists (5)

• Founders in Waltham, MA
• Biotech founders
• Biotech founders in Waltham, MA
• Founders backed by Atlas Venture
• Founders backed by David Grayzel

Full founder directory · Investor directory · Company funding database · Fundraising library