Michael Cloonan

CEO

bluebird bio, Inc.Sionna Therapeutics, Inc.

Insider activity · 24 months0 buys2 salesCumulative net flow

Nov 24 · 0 buys · 0 salesDec 24 · 0 buys · 0 salesJan 25 · 0 buys · 0 salesFeb 25 · 0 buys · 0 salesMar 25 · 0 buys · 0 salesApr 25 · 0 buys · 0 salesMay 25 · 0 buys · 0 salesJun 25 · 0 buys · 0 salesJul 25 · 0 buys · 0 salesAug 25 · 0 buys · 0 salesSept 25 · 0 buys · 2 salesOct 25 · 0 buys · 0 salesNov 25 · 0 buys · 0 salesDec 25 · 0 buys · 0 salesJan 26 · 0 buys · 0 salesFeb 26 · 0 buys · 0 salesMar 26 · 0 buys · 0 salesApr 26 · 0 buys · 0 salesMay 26 · 0 buys · 0 salesJun 26 · 0 buys · 0 salesJul 26 · 0 buys · 0 salesAug 26 · 0 buys · 0 salesSept 26 · 0 buys · 0 salesOct 26 · 0 buys · 0 sales

Total declarations

Companies

▲ Purchases (0 ops.)

—

▼ Sales (2 ops.)

€623k

Latest filing published 18 Sept 2026 for Sionna Therapeutics, Inc.. Read the official filing

Filing timeline

BuySale

Michael Cloonan

Insider track record

Disclosed buys

Disclosed sells

Not enough buy signals with a settled T+90 horizon to measure a track record yet.

Signal history

Michael Cloonan: trading record in brief

Michael Cloonan discloses dealings in 2 companies, chiefly Sionna Therapeutics, Inc. and bluebird bio, Inc. Over a trading history stretching from 30 September 2024 to 17 September 2026, the count stands at 12 filings.

Sales make up the whole of the open-market record (2 sales, €623k). The rest of the record consists of 3 share grants and 6 option exercises.

Most recently, on 18 September 2026, the filings show a share grant in Sionna Therapeutics, Inc. Between a trade and the moment it shows up on SEC (Form 4), the median delay is 1 day. The legal deadline for a Form 4 is two business days after the transaction. Keep in mind that insiders sell for many reasons unrelated to the outlook, from tax bills to estate planning. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.