Summary
Updated Aug 31, 2026
Lynn Seely is President and CEO, Director of Lyell Immunopharma, Inc. (LYEL). 11 SEC Form 4 filings on record going back to 2025, most recently on 25 August 2026. Most recent open-market trade: sold $149K of LYEL on 25 August 2026. Lifetime open-market sales: $438K.
Recent Transactions
13Every recent SEC Form 4 transaction Lynn Seely has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Lynn Seely go back to 2025: 11 primary Form 4 filings, an average of 5.5 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Lynn Seely files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- ARCH Venture Fund XIII, L.P. - $12.50M of LYEL open-market activity in the last 12 months
- ARCH Venture Partners IX, LLC - $12.50M of LYEL open-market activity in the last 12 months
- Michael R. Hayden - $1.05M of ABCL open-market activity in the last 12 months
- Thermopylae Holdings Ltd. - $711K of ABCL open-market activity in the last 12 months
- Andrew Booth - $530K of ABCL open-market activity in the last 12 months
- John S. Montalbano - $384K of ABCL open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Lynn Seely?
Lynn Seely is a corporate insider, tracked as President and CEO, Director of Lyell Immunopharma, Inc. (LYEL). InsiderAlpha holds 11 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Lynn Seely submitted recently?
4 primary Form 4 filings in the last 90 days, covering 2 companies.
Has Lynn Seely been buying or selling stock?
Recorded transactions: 0 open-market purchases and 9 open-market sales ($438K) across all tracked filings.
Where can I see all of Lynn Seely's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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