Silence Therapeutics plc (SLN) Insider Trading
Over the last 3 months, SLN insiders made 0 open-market buys and 16 sales, a net sale of -$102.5M (SEC Form 4). Over the last 6 months, 24 institutions increased and 14 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
16
Net (3m)
-$102.5M
Insider trades by month Buys Sells
Jun
Jul
Aug
Feb
Jul
Aug
Context3-month price +114.8%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 120,000 | $16.00 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 60,000 | $16.35 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 2,792,826 | $16.00 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 100,000 | $15.58 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 50,000 | $16.09 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 3,500 | $16.35 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 800,000 | $16.00 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 382,000 | $16.00 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 470,820 | $16.09 |
| Aug 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 605,174 | $16.00 |
| Jul 7, 2026 | Griffiths Richard Ian10 percent owner | Sell | 79,180 | $10.62 |
| Jul 7, 2026 | Griffiths Richard Ian10 percent owner | Sell | 330,072 | $10.69 |
| Jul 7, 2026 | Griffiths Richard Ian10 percent owner | Sell | 865,112 | $10.53 |
| Jul 7, 2026 | Griffiths Richard Ian10 percent owner | Sell | 50,082 | $10.47 |
| Jul 7, 2026 | Griffiths Richard Ian10 percent owner | Sell | 50,000 | $10.62 |
| Jul 7, 2026 | Griffiths Richard Ian10 percent owner | Sell | 169,928 | $10.76 |
| Feb 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 20,000 | $5.45 |
| Feb 13, 2026 | Griffiths Richard Ian10 percent owner | Sell | 2,000 | $7.75 |
| Feb 13, 2026 | Griffiths Richard Ian10 percent owner | Buy | 2,000 | $7.75 |
| Feb 13, 2026 | Griffiths Richard Ian10 percent owner | Buy | 20,000 | $5.45 |
| Jan 6, 2026 | Ede-Golightly Jamesdirector | Grant | 90,000 | $2.05 |
| Jan 6, 2026 | Lemus Daviddirector | Grant | 90,000 | $2.05 |
| Jan 6, 2026 | HELLUMS RHONDA LYNETTEdirector, officer: Chief Financial Officer | Grant | 375,000 | $2.05 |
| Jan 6, 2026 | Romano Steven J.officer: EVP and Chief R&D Officer | Grant | 300,000 | $2.05 |
| Jan 6, 2026 | MCINERNEY TIMOTHYdirector | Grant | 90,000 | $2.05 |
| Dec 22, 2025 | Ede-Golightly Jamesdirector | Grant | 90,000 | $2.15 |
| Dec 22, 2025 | Ross Iaindirector, officer: Interim PEO | Grant | 900,000 | $2.08 |
| Aug 4, 2025 | Griffiths Richard Ian10 percent owner | Buy | 4,034 | $6.14 |
| Aug 4, 2025 | Griffiths Richard Ian10 percent owner | Buy | 14,342 | $6.18 |
| Jul 31, 2025 | Griffiths Richard Ian10 percent owner | Buy | 14,559 | $6.20 |
Source: SLN SEC Form 4 filings, latest Aug 13, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their SLN positions over the last 6 months (SEC Form 13F).
Increased
24
New positions
7
Reduced
14
Sold out
57
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| TCG CROSSOVER MANAGEMENT, LLC | Unchanged | 3.0M | May 15, 2026 |
| SIREN, L.L.C. | Unchanged | 2.9M | May 14, 2026 |
| REDMILE GROUP, LLC | Unchanged | 2.2M | May 15, 2026 |
| NANTAHALA CAPITAL MANAGEMENT, LLC | Increased | 2.1M | May 15, 2026 |
| CITADEL ADVISORS LLC | Increased | 1.2M | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 1.1M | May 15, 2026 |
| GREAT POINT PARTNERS LLC | Increased | 1.0M | May 15, 2026 |
| NEXTECH INVEST, LTD. | Unchanged | 952K | May 15, 2026 |
| IKARIAN CAPITAL, LLC | Unchanged | 866K | May 15, 2026 |
| TFG ASSET MANAGEMENT GP LTD | Increased | 630K | May 15, 2026 |
| 5AM VENTURE MANAGEMENT, LLC | Unchanged | 476K | May 15, 2026 |
| Jones Hill Capital LP | New Position | 302K | May 14, 2026 |
| SG AMERICAS SECURITIES, LLC | Increased | 287K | Apr 16, 2026 |
| UBS GROUP AG | Increased | 247K | May 5, 2026 |
| BOOTHBAY FUND MANAGEMENT, LLC | Unchanged | 209K | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.