SLN
Silence Therapeutics Plc
NASDAQ · Healthcare · Biotechnology · GB
$12.20
−3.94%0
Insider buys (3m)
16
Insider sells (3m)
-$102.5M
Net value (3m)
+63.5%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 120,000 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 60,000 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 2,792,826 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 100,000 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 50,000 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 3,500 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 800,000 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 382,000 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 470,820 | $16 |
| Aug 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 605,174 | $16 |
| Jul 7, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 79,180 | $11 |
| Jul 7, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 330,072 | $11 |
| Jul 7, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 865,112 | $11 |
| Jul 7, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 50,082 | $10 |
| Jul 7, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 50,000 | $11 |
| Jul 7, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 169,928 | $11 |
| Feb 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 20,000 | $5.45 |
| Feb 13, 2026 | Griffiths Richard Ian · 10 percent owner | Sale | 2,000 | $7.75 |
| Feb 13, 2026 | Griffiths Richard Ian · 10 percent owner | Purchase | 2,000 | $7.75 |
| Feb 13, 2026 | Griffiths Richard Ian · 10 percent owner | Purchase | 20,000 | $5.45 |
| Jan 6, 2026 | Ede-Golightly James · director | A-Award | 90,000 | $2.05 |
| Jan 6, 2026 | Lemus David · director | A-Award | 90,000 | $2.05 |
| Jan 6, 2026 | HELLUMS RHONDA LYNETTE · director, officer: Chief Financial Officer | A-Award | 375,000 | $2.05 |
| Jan 6, 2026 | Romano Steven J. · officer: EVP and Chief R&D Officer | A-Award | 300,000 | $2.05 |
| Jan 6, 2026 | MCINERNEY TIMOTHY · director | A-Award | 90,000 | $2.05 |
| Dec 22, 2025 | Ede-Golightly James · director | A-Award | 90,000 | $2.15 |
| Dec 22, 2025 | Ross Iain · director, officer: Interim PEO | A-Award | 900,000 | $2.08 |
| Aug 4, 2025 | Griffiths Richard Ian · 10 percent owner | Purchase | 4,034 | $6.14 |
| Aug 4, 2025 | Griffiths Richard Ian · 10 percent owner | Purchase | 14,342 | $6.18 |
| Jul 31, 2025 | Griffiths Richard Ian · 10 percent owner | Purchase | 14,559 | $6.20 |
Institutional positioning
13F filings over the trailing two quarters
New 26Increased 45Reduced 32Sold out 5
| Filer | Action | Shares | Filed |
|---|---|---|---|
| Siren, L.L.C. | Increased | 3,311,438 | Aug 13, 2026 |
| TCG Crossover Management, LLC | Unchanged | 3,033,560 | Aug 14, 2026 |
| TCG CROSSOVER MANAGEMENT, LLC | Unchanged | 3,033,560 | May 15, 2026 |
| SIREN, L.L.C. | Unchanged | 2,911,438 | May 14, 2026 |
| REDMILE GROUP, LLC | Unchanged | 2,164,777 | May 15, 2026 |
| Redmile Group, LLC | Unchanged | 2,164,777 | Aug 14, 2026 |
| NANTAHALA CAPITAL MANAGEMENT, LLC | Increased | 2,146,731 | May 15, 2026 |
| Nantahala Capital Management, LLC | Reduced | 1,346,731 | Aug 19, 2026 |
| CITADEL ADVISORS LLC | Increased | 1,329,625 | Sep 2, 2026 |
| CITADEL ADVISORS LLC | Increased | 1,246,107 | May 15, 2026 |
| MILLENNIUM MANAGEMENT LLC | Increased | 1,074,191 | May 15, 2026 |
| Tetragon Partners GP Ltd | Increased | 1,064,256 | Aug 13, 2026 |
| GREAT POINT PARTNERS LLC | Increased | 1,020,489 | May 15, 2026 |
| Nextech Invest, Ltd. | Unchanged | 952,400 | Aug 14, 2026 |
| NEXTECH INVEST, LTD. | Unchanged | 952,400 | May 15, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Aug 13, 2026