ARCH Venture Partners IX, LLC
CIK 1723174 · last filed 2026-03-09
ARCH Venture Partners IX, LLC is a corporate insider who has filed 7 SEC Form 4 insider transactions across 4 companies since 2019. The most recent filing shows the insider bought $62.5M of LYEL on Mar 9, 2026. Across all open-market trades the lifetime net is +$62.5M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $216.3M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$216.28M
4
7
$62.50M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| LYEL | 10%+ Owner | 910,317 | $13.50 | $12.29M | $62.50M | 1 | 2026-03-09 |
| VIR | 10%+ Owner | 11,735,405 | $8.61 | $101.04M | $0 | 2 | 2021-12-01 |
| BEAM | 10%+ Owner | 3,523,953 | $29.03 | $102.30M | $0 | 3 | 2021-04-02 |
| GOSS | 10%+ Owner | 4,027,958 | $0.16 | $652.1K | $0 | 1 | 2019-02-12 |
Recent Filings
7 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-09 | LYEL | Buy (P) | +2,440,450 | $62.50M | EDGAR |
| 2021-12-01 | VIR | Other (J) | −3,377,605 | $0 | EDGAR |
| 2021-04-09 | VIR | Other (J) | −6,941,480 | $0 | EDGAR |
| 2021-04-02 | BEAM | Other (J) | −2,776,438 | $0 | EDGAR |
| 2021-03-22 | BEAM | Other (J) | −5,552,883 | $0 | EDGAR |
| 2020-02-11 | BEAM | Conv (C) | +57,701,273 | $0 | EDGAR |
| 2019-02-12 | GOSS | Conv (C) | +64,447,328 | $0 | EDGAR |