Who owns Boundless Bio, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of BOLD from SEC Form 13F filings across 41 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 41 institutions disclosed 15.3M shares of Boundless Bio, Inc. worth $37.4M — about 68.2% of shares outstanding; the largest disclosed holder is ARCH Venture Management, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
41
13F holders
$37.4M
value, 2026 filers
68.2%
of shares outstanding (15.3M sh)
15
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of BOLD's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | ARCH Venture Management, LLCNEW | 2.7M | $6.7M | 0.6% | 12% | new |
| 2 | FMR LLC | 2.6M | $6.5M | 0.0% | 11.5% | -4.2% |
| 3 | TANG CAPITAL MANAGEMENT LLCNEW | 2.6M | $6.4M | 0.3% | 11.4% | new |
| 4 | ADAR1 Capital Management, LLCNEW | 2.0M | $4.9M | 0.2% | 8.8% | new |
| 5 | Cormorant Asset Management, LPNEW | 1.0M | $2.5M | 0.1% | 4.5% | new |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 614,923 | $1.5M | 0.0% | 2.7% | +3.0% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | 556,233 | $1.4M | 0.0% | 2.5% | 0.0% |
| 8 | MILLENNIUM MANAGEMENT LLC | 478,639 | $1.2M | 0.0% | 2.1% | +379.2% |
| 9 | RENAISSANCE TECHNOLOGIES LLC | 471,570 | $1.2M | 0.0% | 2.1% | +18.2% |
| 10 | Alyeska Investment Group, L.P. | 300,000 | $750,000 | 0.0% | 1.3% | 0.0% |
| 11 | Affinity Asset Advisors, LLCNEW | 250,000 | $625,000 | 0.0% | 1.1% | new |
| 12 | RBF Capital, LLC | 200,000 | $500,000 | 0.0% | 0.9% | 0.0% |
| 13 | Ensign Peak Advisors, Inc | 159,835 | $399,588 | 0.0% | 0.7% | -14.8% |
| 14 | Stonepine Capital Management, LLC | 154,595 | $386,488 | 0.2% | 0.7% | -74.1% |
| 15 | ACADIAN ASSET MANAGEMENT LLC | 146,757 | $365 | 0.0% | 0.7% | +1063.8% |
| 16 | CITADEL ADVISORS LLC | 145,049 | $362,623 | 0.0% | 0.6% | -89.2% |
| 17 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 128,000 | $320,000 | 0.0% | 0.6% | +153.5% |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | 116,736 | $291,839 | 0.0% | 0.5% | -8.5% |
| 19 | HRT FINANCIAL LPNEW | 116,288 | $290 | 0.0% | 0.5% | new |
| 20 | BlackRock, Inc. | 88,495 | $221,239 | 0.0% | 0.4% | +25.2% |
| 21 | PRELUDE CAPITAL MANAGEMENT, LLCNEW | 83,998 | $209,995 | 0.0% | 0.4% | new |
| 22 | Rangeley Capital, LLCNEW | 74,000 | $185,000 | 0.2% | 0.3% | new |
| 23 | GSA CAPITAL PARTNERS LLP | 72,353 | $181 | 0.0% | 0.3% | -25.3% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 65,136 | $162,840 | 0.0% | 0.3% | 0.0% |
| 25 | JANE STREET GROUP, LLCNEW | 64,323 | $160,807 | 0.0% | 0.3% | new |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.