RA CAPITAL MANAGEMENT, L.P. sold 50.0% of their position (3.45M shares) of SIONNA THERAPEUTICS, INC. on the open market
Open‑market sale worth $21.84M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.
S · 2 sales
Filed: 9/21/2026ACC: 0001231919-26-001201
Director10% Owner
Since Feb 2025
-3.45M
Net shares
Net seller
$21.84M
Total sold
2
Open market trades
0B · 2S
2
Total transactions
3.45M disposed
Non-Derivative Transactions2
Common Stock
Indirect
Shares
−3.42M
Price / share
$6.32
Trade value
$21.58M
% of position
49.5%
9/17/2026
6.90M→3.48M
Common Stock
Indirect
Shares
−33.80K
Price / share
$7.46
Trade value
$252.15K
% of position
1.0%
9/17/2026
3.48M→3.45M
Total
Net shares
−3.45M
Net value
-$21.84M
| Security | Date | Type | Shares | Price / Share | Trade Value | % of Position | Held Before | Held After |
|---|---|---|---|---|---|---|---|---|
| Common Stock Indirect | 9/17/2026 | S · Sale | −3.42M | $6.32 | $21.58M | 49.5% | 6.90M | 3.48M |
| Common Stock Indirect | 9/17/2026 | S · Sale | −33.80K | $7.46 | $252.15K | 1.0% | 3.48M | 3.45M |
| Total | −3.45M | -$21.84M | ||||||
Derivative Transactions0
No derivative transactions reported
Non-Derivative Holdings (Post-Transaction)3
Common Stock
IndirectShares owned650.31K
Common Stock
IndirectShares owned2.20M
Common Stock
IndirectShares owned159.03K
Total
3.01M indirect3.01M
| Security Title | Shares Owned | Ownership Type |
|---|---|---|
| Common Stock | 650.31K | Indirect |
| Common Stock | 2.20M | Indirect |
| Common Stock | 159.03K | Indirect |
| Total | 3.01M | 3.01M indirect |
Derivative Holdings (Post-Transaction)0
No derivative holdings reported