Boundless Bio, Inc.
BOLD- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001782303
In the last 90 days, Boundless Bio, Inc. insiders filed 6 open-market purchases and 2 sales; 40 institutions reported holding it in 13F filings for Q2 2026, worth $38.3M in total; no superinvestor holds it.
Key figures
- Insider buysLast 90 days, $1.52M in total
- 6
- Insider sellsLast 90 days, $94.2K in total
- 2
- 13F holdersQ2 2026, +5 vs. previous quarter
- 40
- 13F valueReported value at the end of Q2 2026
- $38.3M
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Superinvestors holding BOLD, Q2 2026
No superinvestor reported holding BOLD at the end of Q2 2026.
Latest insider trades
Open-market purchases and sales by Boundless Bio, Inc. insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 28, 2026 (view filing)4:16 PM ET | Aug 26 | 2 days | Tang Kevin C and 1 other10% Owner | SSale | −18.3K | $2.97 | −$54.4K | −0.6%2.84M after | |
| Jul 21, 2026 (view filing)7:38 PM ET | Jul 17-21 | 4 days | Tang Kevin C and 1 other10% Owner | PPurchase | +4.86K | $2.44 | +$11.9K | +0.2%2.86M after | 3 lots |
| Jul 16, 2026 (view filing)8:10 PM ET | Jul 14-16 | 2 days | Tang Kevin C and 1 other10% Owner | PPurchase | +64.0K | $2.43 | +$155.6K | +2.3%2.85M after | 3 lots |
| Jul 13, 2026 (view filing)7:06 PM ET | Jul 9-13 | 4 days | Tang Kevin C and 1 other10% Owner | PPurchase | +91.6K | $2.42 | +$222.1K | +3.4%2.79M after | 3 lots |
| Jul 8, 2026 (view filing)8:06 PM ET | Jul 6-8 | 2 days | Tang Kevin C and 1 other10% Owner | PPurchase | +57.2K | $2.48 | +$141.9K | +2.2%2.70M after | 3 lots |
| Jul 6, 2026 (view filing)5:44 PM ET | Jul 1 | 5 days | Crandell Keith and 4 others10% Owner | SSale | −16.0K | $2.49 | −$39.8K | −100.0%0 after | Duplicate filing |
| Jul 6, 2026 (view filing)5:43 PM ET | Jul 1 | 5 days | ARCH Venture Fund IX, L.P. and 7 others10% Owner | SSale | −16.0K | $2.49 | −$39.8K | −100.0%0 after | |
| Jul 2, 2026 (view filing)7:45 PM ET | Jun 30-Jul 2 | 2 days | Tang Kevin C and 1 other10% Owner | PPurchase | +107.5K | $2.50 | +$268.9K | +4.2%2.64M after | 4 lots |
| Jun 29, 2026 (view filing)7:56 PM ET | Jun 25-29 | 4 days | Tang Kevin C and 1 other10% Owner | PPurchase | +286.3K | $2.50 | +$714.8K | +12.7%2.53M after | 6 lots |
| Apr 4, 2024 (view filing)4:30 PM ET | Apr 2 | 2 days | Crandell Keith and 3 others10% Owner | PPurchase | +200.0K | $16.00 | +$3.20M | +20.4%1.18M after | 2 lotsDuplicate filing |
Top 10 13F holders, Q2 2026
The largest institutional positions in Boundless Bio, Inc. at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| ARCH Venture Management, LLC | 2,694,095 | $6.74M | 0.61% | +2,694,095 | New |
| FMR LLC | 2,581,055 | $6.45M | 0.00% | −114,400−4.2% | Reduced |
| Tang Capital Management LLC | 2,559,875 | $6.40M | 0.29% | +2,559,875 | New |
| ADAR1 Capital Management, LLC | 1,968,216 | $4.92M | 0.23% | +1,968,216 | New |
| Cormorant Asset Management, LP | 1,000,000 | $2.50M | 0.13% | +1,000,000 | New |
| Vanguard Capital Management LLC | 614,923 | $1.54M | 0.00% | +17,731+3.0% | Added |
| Wellington Management Group LLP | 556,233 | $1.39M | 0.00% | 00.0% | Unchanged |
| Millennium Management LLC | 478,639 | $1.20M | 0.00% | +378,764+379.2% | Added |
| Renaissance Technologies LLC | 471,570 | $1.18M | 0.00% | +72,570+18.2% | Added |
| Alyeska Investment Group, L.P. | 300,000 | $750.0K | 0.00% | 00.0% | Unchanged |