Summary
Updated Aug 30, 2026
ARCH Venture Fund IX, L.P. is 10% Owner of Boundless Bio, Inc. (BOLD). 1 SEC Form 4 filing on record, dated 6 July 2026. Most recent open-market trade: sold $40K of BOLD on 6 July 2026. Lifetime open-market sales: $40K.
Recent Transactions
2Every recent SEC Form 4 transaction ARCH Venture Fund IX, L.P. has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies ARCH Venture Fund IX, 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.
- Kevin Tang - $1.57M of BOLD open-market activity in the last 12 months
- Keith Crandell - $40K of BOLD 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 IX, L.P.?
ARCH Venture Fund IX, L.P. is an investment firm, tracked as 10% Owner of Boundless Bio, Inc. (BOLD). InsiderAlpha holds 1 primary Form 4 filing for it, the earliest from 2026, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has ARCH Venture Fund IX, L.P. submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has ARCH Venture Fund IX, L.P. been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($40K) across all tracked filings.
Where can I see all of ARCH Venture Fund IX, 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.
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