Michael Cloonan sold $781K of Sionna Therapeutics (SION)

Executed Oct 15 2025, disclosed Oct 17 2025, 2 days later.

Value, as filed

$781K

25,000 sh across 2 lots

Executed

Oct 15 2025

the trade date, as filed

Disclosed

Oct 17 2025

2 days 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 3 Form 4 reports in the trailing twelve months (0 purchases, 3 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 · 44 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. $3.6M
99,800 sh across 4 lots
Exec Oct 21 2025
Filed Oct 22 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