Summary
Updated Aug 31, 2026
ARCH Venture Partners X, LLC is 10% Owner of Neumora Therapeutics, Inc. (NMRA). 2 SEC Form 4 filings on record, most recently on 29 October 2025. Most recent open-market trade: bought $5.00M of NMRA on 29 October 2025. Lifetime open-market purchases: $15.00M.
Recent Transactions
2Every recent SEC Form 4 transaction ARCH Venture Partners X, LLC has reported, most recent first.
Trading Pattern
InsiderAlpha's records for ARCH Venture Partners X, LLC go back to 2025: 2 primary Form 4 filings, an average of 1.0 per year. The typical open-market purchase is $7.50M (2 buys totaling $15.00M). The largest single buy on record is $10.00M of PRME in 2025. 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 Partners X, LLC 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 XII, LLC - $5.00M of NMRA open-market activity in the last 12 months
- Kristina Burow - $5.00M of NMRA open-market activity in the last 12 months
- Daljit Singh Aurora - $1.03M of NMRA open-market activity in the last 12 months
- Paul L. Berns - $34K of NMRA open-market activity in the last 12 months
- Joshua Pinto - $21K of NMRA open-market activity in the last 12 months
- Michael Lee Milligan - $5K of NMRA 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 Partners X, LLC?
ARCH Venture Partners X, LLC is an investment firm, tracked as 10% Owner of Neumora Therapeutics, Inc. (NMRA). InsiderAlpha holds 2 primary Form 4 filings for it, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did ARCH Venture Partners X, LLC last file a Form 4?
The most recent primary Form 4 on record is dated 29 October 2025, one of 2 filings going back to 2025.
Has ARCH Venture Partners X, LLC been buying or selling stock?
Recorded transactions: 2 open-market purchases ($15.00M) and 0 open-market sales across all tracked filings.
Where can I see all of ARCH Venture Partners X, LLC'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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