Holders — by stockHoldings — by fund
ARCH Venture Management, LLC
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0001274403
$1.10B
disclosed book value
12
positions
16%
largest position share
Positions, as of 2026-06-30
top 12 of 12 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | PBLSPARABILIS MEDICINES INC | 6.4M | $175.5M | 16% |
| 2 | BEAMBEAM THERAPEUTICS INC | 4.5M | $155.8M | 14.2% |
| 3 | RAPPRAPPORT THERAPEUTICS INC | 3.7M | $155.4M | 14.1% |
| 4 | SPTXSEAPORT THERAPEUTICS INC | 6.3M | $136.6M | 12.4% |
| 5 | ERASERASCA INC | 7.1M | $129.9M | 11.8% |
| 6 | VIRVIR BIOTECHNOLOGY INC | 12.7M | $129.4M | 11.8% |
| 7 | MAZEMAZE THERAPEUTICS INC | 4.1M | $123.0M | 11.2% |
| 8 | LYELLYELL IMMUNOPHARMA INC | 3.2M | $45.5M | 4.1% |
| 9 | GENBGENERATE BIOMEDICINES INC | 1.9M | $32.8M | 3% |
| 10 | TXG10X GENOMICS INC | 217,834 | $8.4M | 0.8% |
| 11 | BOLDBOUNDLESS BIO INC | 2.7M | $6.7M | 0.6% |
| 12 | GOSSGOSSAMER BIO INC | 8.1M | $1.3M | 0.1% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.