Boundless Bio, Inc. (BOLD) — Institutional Holders, Q2 2026
40 institutional investment managers reported a BOLD position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $38.3M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
BOLD in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- ARCH Venture ManagementNew · +2,694,095 sh+$6.7M
- TANG CAPITAL MANAGEMENTNew · +2,559,875 sh+$6.4M
- ADAR1 Capital ManagementNew · +1,968,216 sh+$4.9M
- Cormorant Asset ManagementNew · +1,000,000 sh+$2.5M
- MILLENNIUM MANAGEMENTAdded · +378,764 sh+$946.9K
Biggest sellers
- CITADEL ADVISORSTrimmed · -1,197,082 sh-$3.0M
- SECTORAL ASSET MANAGEMENTSold out · -678,574 sh-$1.7M
- Stonepine Capital ManagementTrimmed · -443,087 sh-$1.1M
- Sio Capital ManagementSold out · -163,679 sh-$409.2K
- FMRTrimmed · -114,400 sh-$286.0K
BOLD 13F holders ranked 1–40 of 40
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | ARCH Venture Management#1 · 2,694,095 sh | 2,694,095 | $6.7M | 0.61% | New |
| 2 | FMR#2 · 2,581,055 sh | 2,581,055 | $6.5M | <0.01% | -4.2% |
| 3 | TANG CAPITAL MANAGEMENT#3 · 2,559,875 sh | 2,559,875 | $6.4M | 0.29% | New |
| 4 | ADAR1 Capital Management#4 · 1,968,216 sh | 1,968,216 | $4.9M | 0.23% | New |
| 5 | Cormorant Asset Management#5 · 1,000,000 sh | 1,000,000 | $2.5M | 0.13% | New |
| 6 | VANGUARD CAPITAL MANAGEMENT#6 · 614,923 sh | 614,923 | $1.5M | 0.00% | +3.0% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP#7 · 556,233 sh | 556,233 | $1.4M | <0.01% | 0.0% |
| 8 | MILLENNIUM MANAGEMENT#8 · 478,639 sh | 478,639 | $1.2M | <0.01% | +379.2% |
| 9 | RENAISSANCE TECHNOLOGIES#9 · 471,570 sh | 471,570 | $1.2M | <0.01% | +18.2% |
| 10 | Alyeska Investment Group, L.P.#10 · 300,000 sh | 300,000 | $750.0K | <0.01% | 0.0% |
| 11 | Affinity Asset Advisors#11 · 250,000 sh | 250,000 | $625.0K | 0.03% | New |
| 12 | RBF Capital#12 · 200,000 sh | 200,000 | $500.0K | 0.02% | 0.0% |
| 13 | Ensign Peak Advisors#13 · 159,835 sh | 159,835 | $399.6K | <0.01% | -14.8% |
| 14 | Stonepine Capital Management#14 · 154,595 sh | 154,595 | $386.5K | 0.18% | -74.1% |
| 15 | ACADIAN ASSET MANAGEMENT#15 · 146,757 sh | 146,757 | $365.0K | <0.01% | +1063.8% |
| 16 | CITADEL ADVISORS#16 · 145,049 sh | 145,049 | $362.6K | 0.00% | -89.2% |
| 17 | BRIDGEWAY CAPITAL MANAGEMENT#17 · 128,000 sh | 128,000 | $320.0K | <0.01% | +153.5% |
| 18 | GEODE CAPITAL MANAGEMENT#18 · 116,736 sh | 116,736 | $291.8K | 0.00% | -8.5% |
| 19 | HRT FINANCIAL#19 · 116,288 sh | 116,288 | $290.0K | <0.01% | New |
| 20 | BlackRock#20 · 88,495 sh | 88,495 | $221.2K | 0.00% | +25.2% |
| 21 | PRELUDE CAPITAL MANAGEMENT#21 · 83,998 sh | 83,998 | $210.0K | 0.02% | New |
| 22 | Rangeley Capital#22 · 74,000 sh | 74,000 | $185.0K | 0.17% | New |
| 23 | GSA CAPITAL PARTNERS LLP#23 · 72,353 sh | 72,353 | $181.0K | 0.01% | -25.3% |
| 24 | VANGUARD FIDUCIARY#24 · 65,136 sh | 65,136 | $162.8K | 0.00% | 0.0% |
| 25 | JANE STREET GROUP#25 · 64,323 sh | 64,323 | $160.8K | 0.00% | New |
| 26 | SUPERSTRING CAPITAL MANAGEMENT#26 · 55,356 sh | 55,356 | $138.4K | 0.09% | New |
| 27 | NORTHERN#27 · 34,824 sh | 34,824 | $87.1K | 0.00% | New |
| 28 | XTX Topco Ltd#28 · 33,361 sh | 33,361 | $83.4K | <0.01% | -3.8% |
| 29 | Qube Research & Technologies Ltd#29 · 20,207 sh | 20,207 | $50.5K | 0.00% | +15.5% |
| 30 | China Universal Asset Management , Ltd.#30 · 16,900 sh | 16,900 | $42.3K | <0.01% | New |
| 31 | STATE STREET#31 · 15,962 sh | 15,962 | $39.9K | 0.00% | 0.0% |
| 32 | MORGAN STANLEY#32 · 13,000 sh | 13,000 | $32.5K | 0.00% | 0.0% |
| 33 | Caitong International Asset Management , Ltd#33 · 10,443 sh | 10,443 | $26.1K | <0.01% | New |
| 34 | Pure Financial Advisors#34 · 10,100 sh | 10,100 | $25.3K | <0.01% | 0.0% |
| 35 | Tower Research Capital (TRC)#35 · 348 sh | 348 | $870.00 | 0.00% | -85.3% |
| 36 | BNP PARIBAS FINANCIAL MARKETS#36 · 176 sh | 176 | $440.00 | 0.00% | -1.1% |
| 37 | JPMORGAN CHASE#37 · 179 sh | 179 | $439.00 | 0.00% | +5.9% |
| 38 | Financial Management Professionals#38 · 2 sh | 2 | $5.00 | — | New |
| 39 | UBS Group AG#39 · 2 sh | 2 | $5.00 | 0.00% | 0.0% |
| 40 | SBI Securities , Ltd.#40 · 2 sh | 2 | $5.00 | — | +100.0% |
Funds that sold out of BOLD in Q2 2026 (8)
Held BOLD at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| SECTORAL ASSET MANAGEMENT678,574 sh | 678,574 | $746.4K |
| Sio Capital Management163,679 sh | 163,679 | $180.0K |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C.85,792 sh | 85,792 | $94.4K |
| Walleye Capital39,624 sh | 39,624 | $43.6K |
| Squarepoint Ops16,374 sh | 16,374 | $18.0K |
| CITIGROUP8,837 sh | 8,837 | $9.7K |
| Vanguard Global Advisers429 sh | 429 | $472.00 |
| Optiver Holding B.V.168 sh | 168 | $185.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.