Boundless Bio, Inc. (BOLD) Insider Trading
Over the last 3 months, BOLD insiders made 22 open-market buys and 2 sales, a net purchase of $1.4M (SEC Form 4). Over the last 6 months, 13 institutions increased and 17 reduced their position (13F).
Insider Activity
Sentiment
95/100
Buys (3m)
22
Sells (3m)
2
Net (3m)
$1.4M
Insiders buying
Insider trades by month Buys Sells
Oct
Feb
Aug
Nov
Jun
Jul
Context3-month price +87.2%Institutions reducing (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jul 21, 2026 | TANG KEVIN10 percent owner | Buy | 265 | $2.44 |
| Jul 21, 2026 | TANG KEVIN10 percent owner | Buy | 1,623 | $2.44 |
| Jul 21, 2026 | TANG KEVIN10 percent owner | Buy | 2,975 | $2.44 |
| Jul 16, 2026 | TANG KEVIN10 percent owner | Buy | 43,878 | $2.43 |
| Jul 16, 2026 | TANG KEVIN10 percent owner | Buy | 1,600 | $2.44 |
| Jul 16, 2026 | TANG KEVIN10 percent owner | Buy | 18,491 | $2.44 |
| Jul 13, 2026 | TANG KEVIN10 percent owner | Buy | 48,211 | $2.42 |
| Jul 13, 2026 | TANG KEVIN10 percent owner | Buy | 7 | $2.48 |
| Jul 13, 2026 | TANG KEVIN10 percent owner | Buy | 43,367 | $2.43 |
| 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 | ARCH Venture Fund IX, L.P.10 percent owner | Option | 16,000 | $1.03 |
| 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 2, 2026 | TANG KEVIN10 percent owner | Buy | 71,612 | $2.49 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 25,930 | $2.54 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 100 | $2.50 |
| Jul 2, 2026 | TANG KEVIN10 percent owner | Buy | 9,821 | $2.49 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 510 | $2.56 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 777 | $2.48 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 63,985 | $2.47 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 134 | $2.54 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 75,047 | $2.55 |
| Jun 29, 2026 | TANG KEVIN10 percent owner | Buy | 145,880 | $2.48 |
| Jun 15, 2026 | Whiting Nancydirector | Grant | 32,000 | $1.40 |
| Jun 15, 2026 | Lew Jenniferdirector | Grant | 32,000 | $1.40 |
| Jun 15, 2026 | Christensen Jamesdirector | Grant | 32,000 | $1.40 |
| Jun 15, 2026 | Lim Jonathan Edirector | Grant | 48,000 | $1.40 |
Source: BOLD SEC Form 4 filings, latest Jul 21, 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
13
New positions
9
Reduced
17
Sold out
32
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 |
| STONEPINE CAPITAL MANAGEMENT, LLC | Increased | 710K | Feb 13, 2026 |
| SECTORAL ASSET MANAGEMENT INC | Unchanged | 679K | May 15, 2026 |
| STONEPINE CAPITAL MANAGEMENT, LLC | Reduced | 598K | May 14, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 597K | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Unchanged | 556K | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | Unchanged | 556K | Feb 17, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 399K | May 14, 2026 |
| ALYESKA INVESTMENT GROUP, L.P. | Unchanged | 300K | Feb 13, 2026 |
| ALYESKA INVESTMENT GROUP, L.P. | Unchanged | 300K | May 15, 2026 |
| BOXER CAPITAL MANAGEMENT, LLC | Unchanged | 250K | Feb 17, 2026 |
| RBF CAPITAL, LLC | Unchanged | 200K | May 18, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.