RA Capital Nexus Fund III, L.P. sold $14.8M of Sionna Therapeutics (SION)

Executed Oct 24 2025, disclosed Oct 28 2025, 4 days later.

Value, as filed

$14.8M

373,610 sh across 8 lots

Executed

Oct 24 2025

the trade date, as filed

Disclosed

Oct 28 2025

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 Nexus Fund III, L.P. Director profile →

RA Capital Nexus Fund III, L.P. (Director) filed 2 Form 4 reports as a reporting entity in the past 24 months (1 purchase, 1 sale), most often in Mineralys Therapeutics, Inc. (MLYS). Across 1 priced purchase filing, the average 21-session return was -6.4% from execution and -2.5% from disclosure (delay-adjusted; derived). The largest single filing was $17.5M of MLYS (1,296,296 sh × $13.50, as filed), executed Mar 13 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→