Michael Cloonan sold $3.6M of Sionna Therapeutics (SION)

Executed Oct 21 2025, disclosed Oct 22 2025, 1 day later.

Value, as filed

$3.6M

99,800 sh across 4 lots

Executed

Oct 21 2025

the trade date, as filed

Disclosed

Oct 22 2025

1 day after the trade

Return, 21 sessionsiFrom the disclosed entry session; derived

–

purchases only

Returns are measured on stock purchases only.

The filer

Michael Cloonan President & CEO profile →

Michael Cloonan (President & CEO) filed 5 Form 4 reports in the past 24 months (0 purchases, 5 sales), most often in Sionna Therapeutics, Inc. (SION). The largest single filing was $3.6M of SION (99,800 sh across 4 lots, as filed), executed Oct 21 2025.

The name

SION

Sionna Therapeutics, Inc. SION · Healthcare · 45 filings in 24 months ticker →

Healthcare · Sionna Therapeutics, Inc., a clinical-stage biopharmaceutical company, researches and develops medicines for the treatment of cystic fibros…

More Healthcare filings→ Insider filings, newest first→ View the original filing at www.sec.gov→

Other filings by Michael Cloonan in SION

SIONSALE Sionna Therapeutics, Inc. $781K
25,000 sh across 2 lots
Exec Oct 15 2025
Filed Oct 17 2025 · 5:30 PM ET SIONSALE Sionna Therapeutics, Inc. $728K
25,000 sh across 2 lots
Exec Sep 26 2025
Filed Sep 30 2025 · 5:30 PM ET SIONSALE Sionna Therapeutics, Inc. $624K
25,000 sh across 2 lots
Exec Aug 26 2025
Filed Aug 28 2025 · 5:30 PM ET SIONSALE Sionna Therapeutics, Inc. $569K
25,000 sh × $22.75
Exec Aug 20 2025
Filed Aug 21 2025 · 5:30 PM ET