# Boundless Bio, Inc. (BOLD) insider trading, Q3 2026

Canonical: https://sec-api.dev/insider-trading/bold

> 21 non-derivative transactions: 16 purchases ($800K), 3 sales ($134K). CIK 1782303.

| Date | Insider | Relationship | Code | Shares | Price | Owned after | Filing |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2026-08-26 | TANG CAPITAL MANAGEMENT LLC / TANG KEVIN | TenPercentOwner | S | 18300.0 | 2.97 | 2840635.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000018/0001178579-26-000018-index.htm |
| 2026-07-21 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 2975.0 | 2.44 | 2858935.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000017/0001178579-26-000017-index.htm |
| 2026-07-20 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 1623.0 | 2.44 | 2855960.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000017/0001178579-26-000017-index.htm |
| 2026-07-17 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 265.0 | 2.44 | 2854337.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000017/0001178579-26-000017-index.htm |
| 2026-07-16 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 18491.0 | 2.44 | 2854072.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000015/0001178579-26-000015-index.htm |
| 2026-07-15 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 1600.0 | 2.44 | 2835581.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000015/0001178579-26-000015-index.htm |
| 2026-07-14 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 43878.0 | 2.43 | 2833981.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000015/0001178579-26-000015-index.htm |
| 2026-07-13 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 48211.0 | 2.42 | 2790103.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000011/0001178579-26-000011-index.htm |
| 2026-07-10 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 43367.0 | 2.43 | 2741892.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000011/0001178579-26-000011-index.htm |
| 2026-07-09 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 7.0 | 2.48 | 2698525.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000011/0001178579-26-000011-index.htm |
| 2026-07-08 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 14338.0 | 2.46 | 2698518.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000010/0001178579-26-000010-index.htm |
| 2026-07-07 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 15810.0 | 2.48 | 2684180.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000010/0001178579-26-000010-index.htm |
| 2026-07-06 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 27062.0 | 2.49 | 2668370.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000010/0001178579-26-000010-index.htm |
| 2026-07-02 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 9821.0 | 2.49 | 2641308.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000009/0001178579-26-000009-index.htm |
| 2026-07-01 | ARCH Venture Partners IX, L.P. / ARCH Venture Fund IX, L.P. / ARCH Venture Partners IX, LLC / ARCH Venture Partners IX Overage, L.P. / ARCH Venture Fund X Overage, L.P. / ARCH Venture Fund IX Overage, L.P. / ARCH Venture Partners X Overage, L.P. / ARCH Venture Partners X, LLC | TenPercentOwner | M | 16000.0 | 1.03 | 16000.0 | https://www.sec.gov/Archives/edgar/data/1782303/000101297526000621/0001012975-26-000621-index.htm |
| 2026-07-01 | ARCH Venture Partners IX, L.P. / ARCH Venture Fund IX, L.P. / ARCH Venture Partners IX, LLC / ARCH Venture Partners IX Overage, L.P. / ARCH Venture Fund X Overage, L.P. / ARCH Venture Fund IX Overage, L.P. / ARCH Venture Partners X Overage, L.P. / ARCH Venture Partners X, LLC | TenPercentOwner | S | 16000.0 | 2.49 | 0.0 | https://www.sec.gov/Archives/edgar/data/1782303/000101297526000621/0001012975-26-000621-index.htm |
| 2026-07-01 | GILLIS STEVEN / CRANDELL KEITH / NELSEN ROBERT / Burow Kristina / BYBEE CLINTON | TenPercentOwner | M | 16000.0 | 1.03 | 16000.0 | https://www.sec.gov/Archives/edgar/data/1782303/000101297526000622/0001012975-26-000622-index.htm |
| 2026-07-01 | GILLIS STEVEN / CRANDELL KEITH / NELSEN ROBERT / Burow Kristina / BYBEE CLINTON | TenPercentOwner | S | 16000.0 | 2.49 | 0.0 | https://www.sec.gov/Archives/edgar/data/1782303/000101297526000622/0001012975-26-000622-index.htm |
| 2026-07-01 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 71612.0 | 2.49 | 2631487.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000009/0001178579-26-000009-index.htm |
| 2026-06-30 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 25930.0 | 2.54 | 2559775.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000009/0001178579-26-000009-index.htm |
| 2026-06-30 | TANG KEVIN / TANG CAPITAL MANAGEMENT LLC | TenPercentOwner | P | 100.0 | 2.5 | 2559875.0 | https://www.sec.gov/Archives/edgar/data/1782303/000117857926000009/0001178579-26-000009-index.htm |

Source: https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets

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