RA CAPITAL MANAGEMENT, L.P.

PrivateCIK: 1346824
Location

BOSTON, MA

RA CAPITAL MANAGEMENT, L.P. sold 64.1% of their position (373.61K shares) of SIONNA THERAPEUTICS, INC. on the open market

Open‑market sale worth $14.76M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 8 sales
InsiderRA CAPITAL MANAGEMENT, L.P.CIK 1346824
IssuerSIONNA THERAPEUTICS, INC.CIK 2036042
Director10% Owner
Since Feb 2025
-373.61K
Net shares
Net seller
$14.76M
Total sold
8
Open market trades
0B · 8S
8
Total transactions
373.61K disposed
Non-Derivative Transactions8

Common Stock

Indirect
S · Sale

Shares

14.12K

Price / share

$39.50

Trade value

$557.58K

% of position

0.2%
10/24/2025
6.92M6.91M

Common Stock

Indirect
S · Sale

Shares

122.27K

Price / share

$39.50

Trade value

$4.83M

% of position

14.1%
10/24/2025
869.65K747.38K

Common Stock

Indirect
S · Sale

Shares

66.67K

Price / share

$39.50

Trade value

$2.63M

% of position

2.9%
10/24/2025
2.32M2.26M

Common Stock

Indirect
S · Sale

Shares

107.94K

Price / share

$39.50

Trade value

$4.26M

% of position

32.9%
10/24/2025
327.81K219.87K

Common Stock

Indirect
S · Sale

Shares

3.62K

Price / share

$39.58

Trade value

$143.44K

% of position

0.1%
10/28/2025
6.91M6.91M

Common Stock

Indirect
S · Sale

Shares

31.39K

Price / share

$39.58

Trade value

$1.24M

% of position

4.2%
10/28/2025
747.38K715.99K

Common Stock

Indirect
S · Sale

Shares

17.12K

Price / share

$39.58

Trade value

$677.53K

% of position

0.8%
10/28/2025
2.26M2.24M

Common Stock

Indirect
S · Sale

Shares

10.48K

Price / share

$39.58

Trade value

$414.64K

% of position

4.8%
10/28/2025
219.87K209.39K
Total

Net shares

373.61K

Net value

-$14.76M

Derivative Transactions0
No derivative transactions reported
RA CAPITAL MANAGEMENT, L.P. — Insider Transaction (Form 4) Filed Oct 28, 2025 | Finecho