Machine signal
Active cluster sell — 3 distinct insiders, $134K, window ends Aug 26, 2026.
Figures computed from official regulatory filings — .
Analysttarget 4 USD (+73%) · consensus 3/5 · 0 buy · 1 hold · 0 sell
Ownershipinsiders 12.53% · institutions 67.26% · short 5.5% of float
In USD · as of Oct 19, 2026
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Boundless Bio, Inc., a clinical-stage oncology company, develops interrogating extrachromosomal DNA (ecDNA) directed therapies for treating patients with oncogene amplified cancers. Its lead product candidate is BBI-940, an ecDNA-directed therapeutic candidate (ecDTx) that is in Phase 1/2 clinical trial in patients with estrogen receptor positive and human epidermal growth factor receptor 2 negative breast cancer, as well as patients with triple-negative breast cancer luminal androgen receptor subtype. The company was formerly known as Pretzel Therapeutics, Inc. and changed its name to Boundless Bio, Inc. in July 2019. Boundless Bio, Inc. was incorporated in 2018 and is headquartered in San Diego, California.
Market information source · Oct 19, 2026
SEC company identity · Oct 19, 2026
Open-market timeline · full history
34 buys3 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details | |
|---|---|---|---|---|---|
| TANG KEVIN Ctrack record | Buy | $29.9K | SEC |
| TANG KEVIN Ctrack record | Buy | $521.4 | SEC |
| TANG KEVIN Ctrack record | Buy | $42.6K | SEC |
| TANG KEVIN Ctrack record | Buy | $276.6K | SEC |
| TANG KEVIN Ctrack record | Sell | $54.4K | SEC |
| TANG KEVIN Ctrack record | Buy | $4K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $646.6 | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $7.3K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $45.1K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $106.6K | conv 18 | SEC |
| TANG KEVIN Ctrack record | Buy | $3.9K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $105.4K | conv 18 | SEC |
| TANG KEVIN Ctrack record | Buy | $17.4 | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $116.7K | conv 18 | SEC |
| TANG KEVIN Ctrack record | Buy | $39.2K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $35.3K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $67.4K | conv 18 | SEC |
| ARCH Venture Fund IX, L.P. | Sell | $39.8K | SEC |
| CRANDELL KEITHtrack record | ExerciseD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| ARCH Venture Fund IX, L.P. | Exercise | $16.5K | SEC |
| CRANDELL KEITHtrack record | Exercise | $16.5K | SEC |
| CRANDELL KEITHtrack record | Sell | $39.8K | SEC |
| ARCH Venture Fund IX, L.P. | ExerciseD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| TANG KEVIN Ctrack record | Buy | $24.5K | conv 17 | SEC |
| TANG KEVIN Ctrack record | Buy | $250 | conv 17 | SEC |