Lyell Immunopharma, Inc. (LYEL) Insider Trading
Over the last 3 months, LYEL insiders made 0 open-market buys and 1 sale, a net sale of -$25K (SEC Form 4). Over the last 6 months, 47 institutions increased and 26 reduced their position (13F).
Insider Activity
Sentiment
0/100
Buys (3m)
0
Sells (3m)
1
Net (3m)
-$25.0K
Insider trades by month Buys Sells
Aug
Nov
Jan
Feb
Mar
Jun
Context3-month price -46.7%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 11, 2026 | Shook Davidofficer: Chief Medical Officer | Sell | 1,977 | $12.64 |
| Mar 16, 2026 | Shah Smitalofficer: Chief Fin. and Bus. Officer | Grant | 140,000 | $25.50 |
| Mar 9, 2026 | ARCH Venture Fund XIII, L.P.10 percent owner | Buy | 488,090 | $25.61 |
| Mar 9, 2026 | ARCH Venture Partners IX, LLC10 percent owner | Buy | 488,090 | $25.61 |
| Feb 12, 2026 | Seely Lynndirector, officer: President and CEO | Sell | 7,455 | $23.39 |
| Feb 12, 2026 | Lee Gary K.officer: Chief Scientific Officer | Sell | 1,671 | $23.39 |
| Feb 12, 2026 | Hill Stephen J.officer: Chief Operating Officer | Sell | 1,236 | $23.39 |
| Feb 11, 2026 | Seely Lynndirector, officer: President and CEO | Grant | 20,000 | — |
| Feb 11, 2026 | Seely Lynndirector, officer: President and CEO | Sell | 438 | $23.12 |
| Feb 11, 2026 | Meltz Mark Aofficer: General Counsel | Grant | 50,000 | $23.71 |
| Feb 11, 2026 | Bulis Veronica Sanchezofficer: VP, Corporate Controller | Grant | 8,750 | — |
| Feb 11, 2026 | Bulis Veronica Sanchezofficer: VP, Corporate Controller | Sell | 254 | $23.12 |
| Feb 11, 2026 | Shook Davidofficer: Chief Medical Officer | Grant | 50,000 | $23.71 |
| Feb 11, 2026 | Hill Stephen J.officer: Chief Operating Officer | Grant | 65,000 | $23.71 |
| Feb 11, 2026 | Lee Gary K.officer: Chief Scientific Officer | Sell | 147 | $23.12 |
| Feb 11, 2026 | Seely Lynndirector, officer: President and CEO | Grant | 155,000 | $23.71 |
| Feb 11, 2026 | Hill Stephen J.officer: Chief Operating Officer | Sell | 109 | $23.12 |
| Feb 11, 2026 | Lee Gary K.officer: Chief Scientific Officer | Grant | 50,000 | $23.71 |
| Feb 11, 2026 | Lee Gary K.officer: Chief Scientific Officer | Grant | 4,000 | — |
| Feb 11, 2026 | Hill Stephen J.officer: Chief Operating Officer | Grant | 4,000 | — |
| Jan 6, 2026 | Bulis Veronica Sanchezofficer: VP, Corporate Controller | Sell | 936 | $32.32 |
| Jan 6, 2026 | Bulis Veronica Sanchezofficer: VP, Corporate Controller | Sell | 1,136 | $38.67 |
| Nov 12, 2025 | Lee Gary K.officer: Chief Scientific Officer | Sell | 138 | $16.16 |
| Nov 12, 2025 | Hill Stephen J.officer: Chief Operating Officer | Sell | 95 | $16.12 |
| Nov 12, 2025 | Seely Lynndirector, officer: President and CEO | Sell | 412 | $16.11 |
| Nov 12, 2025 | Bulis Veronica Sanchezofficer: VP, Corporate Controller | Sell | 239 | $16.10 |
| Oct 29, 2025 | Hill Stephen J.officer: Chief Operating Officer | Grant | 75,000 | $17.23 |
| Oct 29, 2025 | Seely Lynndirector, officer: President and CEO | Grant | 175,000 | $17.23 |
| Oct 29, 2025 | Lee Gary K.officer: Chief Scientific Officer | Grant | 68,000 | $17.23 |
| Aug 22, 2025 | Newton Charles W.officer: Chief Financial Officer | Grant | 8,000 | — |
Source: LYEL SEC Form 4 filings, latest Jun 11, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their LYEL positions over the last 6 months (SEC Form 13F).
Increased
47
New positions
30
Reduced
26
Sold out
13
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| ARCH VENTURE MANAGEMENT, LLC | Increased | 3.2M | May 15, 2026 |
| ARCH VENTURE MANAGEMENT, LLC | Unchanged | 2.8M | Feb 17, 2026 |
| GSK PLC | New Position | 1.5M | Feb 12, 2026 |
| GSK PLC | Unchanged | 1.5M | May 14, 2026 |
| MWG Caph Ltd | New Position | 1.0M | Feb 17, 2026 |
| VANGUARD GROUP INC | Increased | 826K | Jan 29, 2026 |
| FORESITE CAPITAL MANAGEMENT IV, LLC | Unchanged | 800K | May 15, 2026 |
| FORESITE CAPITAL MANAGEMENT IV, LLC | Unchanged | 800K | Feb 17, 2026 |
| ORLAND PROPERTIES LTD | Unchanged | 755K | May 6, 2026 |
| ORLAND PROPERTIES LTD | Unchanged | 755K | Feb 17, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 718K | May 15, 2026 |
| ALMITAS CAPITAL LLC | Unchanged | 578K | Feb 17, 2026 |
| ALMITAS CAPITAL LLC | Unchanged | 578K | May 15, 2026 |
| FORESITE CAPITAL MANAGEMENT V, LLC | Unchanged | 477K | May 15, 2026 |
| FORESITE CAPITAL MANAGEMENT V, LLC | Unchanged | 477K | Feb 17, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.