Ra Capital Management, L.P. sold $21.8M of Sionna Therapeutics (SION)

Executed Sep 17, disclosed Sep 21, 4 days later.

Value, as filed

$21.8M

3,448,811 sh across 2 lots

Executed

Sep 17

the trade date, as filed

Disclosed

Sep 21

4 days after the trade

Return, 21 sessionsiFrom the disclosed entry session; derived

–

purchases only

Returns are measured on stock purchases only.

The filer

RP Ra Capital Management, L.P. Director profile →

Ra Capital Management, L.P. (Director) filed 30 Form 4 reports as a reporting entity in the trailing twelve months (23 purchases, 7 sales, 1 filed past the two-business-day deadline), most often in Artiva Biotherapeutics, Inc. (ARTV). Across 23 priced purchase filings, the average 21-session return was +14.9% from execution and +14.0% from disclosure (delay-adjusted; derived). The largest single filing was $423.8M of PBLS (21,188,750 sh across 2 lots, as filed), executed Jun 11.

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 Ra Capital Management, L.P. in SION

SIONSALE Sionna Therapeutics, Inc. $5.0M
124,870 sh across 10 lots
Exec Nov 17 2025
Filed Nov 19 2025 · 5:30 PM ET SIONPURCHASE Sionna Therapeutics, Inc. $20.2M
1,125,000 sh across 2 lots
Exec Feb 10 2025
Filed Feb 10 2025 · 5:30 PM ET