Summary
Updated Aug 31, 2026
ARCH Venture Fund XIII, L.P. is 10% Owner of Lyell Immunopharma, Inc. (LYEL). 1 SEC Form 4 filing on record, dated 9 March 2026. Most recent open-market trade: bought $12.50M of LYEL on 9 March 2026. Lifetime open-market purchases: $12.50M.
Recent Transactions
1Every recent SEC Form 4 transaction ARCH Venture Fund XIII, L.P. has reported, most recent first.
Trading Pattern
InsiderAlpha's records for ARCH Venture Fund XIII, L.P. go back to 2026: 1 primary Form 4 filing, an average of 1.0 per year. The typical open-market purchase is $12.50M (1 buy totaling $12.50M). The largest single buy on record is $12.50M of LYEL in 2026. 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 ARCH Venture Fund XIII, L.P. 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 Partners IX, LLC - $12.50M of LYEL open-market activity in the last 12 months
- Lynn Seely - $353K of LYEL open-market activity in the last 12 months
- Gary K. Lee - $72K of LYEL open-market activity in the last 12 months
- Stephen J. Hill - $51K of LYEL open-market activity in the last 12 months
- David Shook - $25K of LYEL open-market activity in the last 12 months
- Veronica Sanchez Bulis - $23K of LYEL 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
What is ARCH Venture Fund XIII, L.P.?
ARCH Venture Fund XIII, L.P. is an investment firm, tracked as 10% Owner of Lyell Immunopharma, Inc. (LYEL). InsiderAlpha holds 1 primary Form 4 filing for it, the earliest from 2026, updated as new SEC EDGAR filings are processed.
When did ARCH Venture Fund XIII, L.P. last file a Form 4?
The only primary Form 4 on record is dated 9 March 2026.
Has ARCH Venture Fund XIII, L.P. been buying or selling stock?
Recorded transactions: 1 open-market purchase ($12.50M) and 0 open-market sales across all tracked filings.
Where can I see all of ARCH Venture Fund XIII, L.P.'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.
Learn More
Follow ARCH Venture Fund XIII, L.P. and every insider like them
A free account opens the full scored daily plan and every past day, a watchlist for any ticker, and 3 months of price history on every company page. No card.
Free plan available · Paid plans start with a 7-day free trial