ARCH Venture Partners IX, LLC — SEC Form 4 Insider Trading Activity

Summary

Updated Jul 16, 2026

ARCH Venture Partners IX, LLC is a corporate insider tracked by InsiderAlpha. No SEC Form 4 filings recorded in the last 90 days. Lifetime open-market purchases: $12.50M.

Profile

ARCH Venture Partners IX, LLC
Role10% Owner
Notability30/100

Recent Transactions

DateTickerCompanyCodeSharesPriceValue
2026-03-09LYELLyell Immunopharma, Inc.P — Open-market purchase488.1K$25.61$12.50M

Frequently Asked Questions

Who is ARCH Venture Partners IX, LLC?

ARCH Venture Partners IX, LLC is a corporate insider — currently tracked as 10% Owner. InsiderAlpha tracks every SEC Form 4 filing in real time.

Has ARCH Venture Partners IX, LLC been buying or selling stock?

Recorded transactions: 1 open-market purchases ($12.50M) and 0 open-market sales () across all tracked filings.

Where can I see all of ARCH Venture Partners IX, 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.

Learn More

Open the live ARCH Venture Partners IX, LLC profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.