Boundless Bio, Inc. (BOLD) Insider Trading
Over the last 3 months, BOLD insiders made 13 open-market buys and 2 sales, a net purchase of $1.0M (SEC Form 4). Over the last 6 months, 20 institutions increased and 21 reduced their position (13F).
Insider Activity
Sentiment
93/100
Buys (3m)
13
Sells (3m)
2
Net (3m)
$1.0M
Insiders buying
Insider trades by month Buys Sells
Oct
Feb
Aug
Nov
Jun
Jul
Context3-month price +122.1%Institutions mixed (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jul 8, 2026 | TANG KEVIN10 percent owner | Buy | 14,338 | $2.46 |
| Jul 8, 2026 | TANG KEVIN10 percent owner | Buy | 27,062 | $2.49 |
| Jul 8, 2026 | TANG KEVIN10 percent owner | Buy | 15,810 | $2.48 |
| Jul 6, 2026 | ARCH Venture Fund IX, L.P.10 percent owner | Sell | 16,000 | $2.49 |
| Jul 6, 2026 | CRANDELL KEITH10 percent owner | Option | 16,000 | $1.03 |
| Jul 6, 2026 | CRANDELL KEITH10 percent owner | Sell | 16,000 | $2.49 |
| Jul 6, 2026 | ARCH Venture Fund IX, L.P.10 percent owner | Option | 16,000 | $1.03 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 25,930 | $2.54 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 9,821 | $2.49 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 71,612 | $2.49 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 100 | $2.50 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 777 | $2.48 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 134 | $2.54 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 63,985 | $2.47 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 145,880 | $2.48 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 510 | $2.56 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 75,047 | $2.55 |
| Jun 15, 2026 | Christensen Jamesdirector | Grant | 32,000 | $1.40 |
| Jun 15, 2026 | Lew Jenniferdirector | Grant | 32,000 | $1.40 |
| Jun 15, 2026 | Whiting Nancydirector | Grant | 32,000 | $1.40 |
| Jun 15, 2026 | Lim Jonathan Edirector | Grant | 48,000 | $1.40 |
| Jan 26, 2026 | HINKLE DAVID Aofficer: See Remarks | Grant | 140,000 | $1.26 |
| Jan 26, 2026 | Oien Jessicaofficer: See Remarks | Grant | 220,000 | $1.26 |
| Jan 26, 2026 | Hassig Christianofficer: Chief Scientific Officer | Grant | 230,000 | $1.26 |
| Jan 26, 2026 | Doebele Robertofficer: Chief Medical Officer | Grant | 230,000 | $1.26 |
| Jan 26, 2026 | Hornby Zacharydirector, officer: President & CEO | Grant | 600,000 | $1.26 |
| Jun 23, 2025 | Lew Jenniferdirector | Grant | 16,000 | $1.03 |
| Jun 23, 2025 | Brennan Christinedirector | Grant | 16,000 | $1.03 |
| Jun 23, 2025 | Christensen Jamesdirector | Grant | 16,000 | $1.03 |
| Jun 23, 2025 | Lim Jonathan Edirector | Grant | 24,000 | $1.03 |
Source: BOLD SEC Form 4 filings, latest Jul 8, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their BOLD positions over the last 6 months (SEC Form 13F).
Increased
20
New positions
11
Reduced
21
Sold out
12
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| FMR LLC | Increased | 2.7M | May 15, 2026 |
| FMR LLC | Reduced | 2.7M | Feb 17, 2026 |
| CITADEL ADVISORS LLC | Increased | 1.4M | Feb 17, 2026 |
| CITADEL ADVISORS LLC | Reduced | 1.3M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.2M | May 15, 2026 |
| STONEPINE CAPITAL MANAGEMENT, LLC | Increased | 710K | Feb 13, 2026 |
| SECTORAL ASSET MANAGEMENT INC | Unchanged | 679K | May 15, 2026 |
| SECTORAL ASSET MANAGEMENT INC | Unchanged | 679K | Feb 9, 2026 |
| VANGUARD GROUP INC | Increased | 663K | Jan 29, 2026 |
| STONEPINE CAPITAL MANAGEMENT, LLC | Reduced | 598K | May 14, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Unchanged | 556K | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Unchanged | 556K | Feb 17, 2026 |
| RBF CAPITAL, LLC | Unchanged | 400K | May 18, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 399K | May 14, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 341K | Feb 12, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.