Sionna Therapeutics, Inc. (SION) Insider Trading
Over the last 3 months, SION insiders made 0 open-market buys and 18 sales, a net sale of -$77.6M (SEC Form 4). Over the last 6 months, 82 institutions increased and 49 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
18
Net (3m)
-$77.6M
Insider trades by month Buys Sells
Dec
Jan
Feb
Mar
Apr
May
Context3-month price +9.7%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 18, 2026 | Booth Brucedirector | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Thompson Peter A.director | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Viney Joanne L.director | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Stelzer Lauriedirector | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Ruddy Marcella K.director | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Resnick Joshuadirector | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Fleming Harold Edwarddirector | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Clancy Paul Jdirector | Grant | 17,340 | $36.73 |
| May 29, 2026 | Thompson Peter A.director | Sell | 101 | $44.49 |
| May 29, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 101 | $44.49 |
| May 11, 2026 | Thompson Peter A.director | Sell | 48,546 | $44.61 |
| May 11, 2026 | Thompson Peter A.director | Sell | 184,639 | $46.22 |
| May 11, 2026 | Thompson Peter A.director | Sell | 59,767 | $44.58 |
| May 11, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 184,639 | $46.22 |
| May 11, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 59,767 | $44.58 |
| May 11, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 48,546 | $44.61 |
| Apr 21, 2026 | Thompson Peter A.director | Sell | 52,397 | $44.68 |
| Apr 21, 2026 | Thompson Peter A.director | Sell | 2,948 | $44.52 |
| Apr 21, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 2,948 | $44.52 |
| Apr 21, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 52,397 | $44.68 |
| Apr 16, 2026 | Thompson Peter A.director | Sell | 47,814 | $44.51 |
| Apr 16, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 235,863 | $44.64 |
| Apr 16, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 47,814 | $44.51 |
| Apr 16, 2026 | Thompson Peter A.director | Sell | 226,906 | $45.34 |
| Apr 16, 2026 | Thompson Peter A.director | Sell | 235,863 | $44.64 |
| Apr 16, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 226,906 | $45.34 |
| Mar 6, 2026 | Fitzpatrick Jenniferofficer: Chief Legal Officer | Option | 10,250 | $6.11 |
| Mar 6, 2026 | Fitzpatrick Jenniferofficer: Chief Legal Officer | Sell | 10,250 | $33.86 |
| Feb 4, 2026 | Thompson Peter A.director | Sell | 1,890 | $44.57 |
Source: SION SEC Form 4 filings, latest Jun 18, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their SION positions over the last 6 months (SEC Form 13F).
Increased
82
New positions
61
Reduced
49
Sold out
16
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | Unchanged | 9.9M | May 15, 2026 |
| RA CAPITAL MANAGEMENT, L.P. | Reduced | 9.9M | Feb 17, 2026 |
| TPG GP A, LLC | Unchanged | 6.7M | Feb 13, 2026 |
| TPG GP A, LLC | Reduced | 6.5M | May 15, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 3.6M | Feb 17, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 3.5M | May 15, 2026 |
| VIKING GLOBAL INVESTORS LP | Unchanged | 3.2M | Feb 17, 2026 |
| VIKING GLOBAL INVESTORS LP | Unchanged | 3.2M | May 15, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 3.0M | May 14, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Reduced | 3.0M | Feb 13, 2026 |
| ENAVATE SCIENCES GP, LLC | Unchanged | 2.5M | May 15, 2026 |
| ENAVATE SCIENCES GP, LLC | Unchanged | 2.5M | Feb 17, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 2.1M | May 15, 2026 |
| JPMORGAN CHASE & CO | Increased | 1.5M | May 13, 2026 |
| JENNISON ASSOCIATES LLC | Increased | 1.5M | May 6, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.