Sionna Therapeutics, Inc. (SION) Insider Trading
Over the last 3 months, SION insiders made 0 open-market buys and 5 sales, a net sale of -$18.7M (SEC Form 4). Over the last 6 months, 41 institutions increased and 30 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
5
Net (3m)
-$18.7M
Insider trades by month Buys Sells
Jan
Feb
Mar
Apr
May
Jul
Context3-month price -85.6%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jul 9, 2026 | Thompson Peter A.director | Sell | 85,918 | $44.86 |
| Jul 9, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 85,918 | $44.86 |
| Jul 7, 2026 | Fitzpatrick Jenniferofficer: Chief Legal Officer | Sell | 10,250 | $43.60 |
| Jul 7, 2026 | Fitzpatrick Jenniferofficer: Chief Legal Officer | Option | 10,250 | $6.11 |
| Jul 2, 2026 | Thompson Peter A.director | Sell | 115,844 | $45.50 |
| Jul 2, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 115,844 | $45.50 |
| Jun 18, 2026 | Stelzer Lauriedirector | 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 | RA CAPITAL MANAGEMENT, L.P.director, 10 percent owner: | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Booth Brucedirector | Grant | 17,340 | $36.73 |
| Jun 18, 2026 | Clancy Paul Jdirector | 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 | Ruddy Marcella K.director | Grant | 17,340 | $36.73 |
| May 29, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 101 | $44.49 |
| May 29, 2026 | Thompson Peter A.director | Sell | 101 | $44.49 |
| May 11, 2026 | Thompson Peter A.director | Sell | 48,546 | $44.61 |
| 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 |
| May 11, 2026 | Thompson Peter A.director | Sell | 184,639 | $46.22 |
| May 11, 2026 | Thompson Peter A.director | Sell | 59,767 | $44.58 |
| Apr 21, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 2,948 | $44.52 |
| 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 | 52,397 | $44.68 |
| Apr 16, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 47,814 | $44.51 |
| Apr 16, 2026 | ORBIMED ADVISORS LLCdirector | Sell | 235,863 | $44.64 |
| Apr 16, 2026 | Thompson Peter A.director | Sell | 47,814 | $44.51 |
Source: SION SEC Form 4 filings, latest Jul 9, 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
41
New positions
33
Reduced
30
Sold out
120
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. | Unchanged | 9.9M | May 15, 2026 |
| TPG GP A, LLC | Reduced | 6.5M | May 15, 2026 |
| ORBIMED ADVISORS LLC | Reduced | 3.5M | May 15, 2026 |
| VIKING GLOBAL INVESTORS LP | Unchanged | 3.2M | May 15, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 3.0M | May 14, 2026 |
| ENAVATE SCIENCES GP, LLC | Unchanged | 2.5M | May 15, 2026 |
| JPMORGAN CHASE & CO | Increased | 1.5M | May 13, 2026 |
| JENNISON ASSOCIATES LLC | Increased | 1.5M | May 6, 2026 |
| BLACKROCK, INC. | Increased | 1.3M | May 13, 2026 |
| CITADEL ADVISORS LLC | Increased | 1.2M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.0M | May 15, 2026 |
| DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) | Unchanged | 971K | May 15, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 756K | May 15, 2026 |
| STATE STREET CORP | Increased | 756K | May 15, 2026 |
| PERCEPTIVE ADVISORS LLC | Reduced | 658K | May 29, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.