Boundless Bio, Inc. (BOLD) Insider Trading
Directors, officers and holders of more than 10% of BOLD report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 57 transactions on file: 30 with code P, 3 with code S and 17 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 27, 2026 | TANG KEVIN | 10% Owner | P Purchase | 10,707 | $2.40 | $25,697 |
| Oct 26, 2026 | TANG KEVIN | 10% Owner | P Purchase | 9,606 | $2.38 | $22,862 |
| Oct 23, 2026 | TANG KEVIN | 10% Owner | P Purchase | 6,234 | $2.38 | $14,837 |
| Oct 22, 2026 | TANG KEVIN | 10% Owner | P Purchase | 5,800 | $2.40 | $13,920 |
| Oct 20, 2026 | TANG KEVIN | 10% Owner | P Purchase | 220 | $2.37 | $521 |
| Oct 19, 2026 | TANG KEVIN | 10% Owner | P Purchase | 18,279 | $2.33 | $42,590 |
| Oct 19, 2026 | TANG KEVIN | 10% Owner | P Purchase | 12,790 | $2.34 | $29,929 |
| Oct 16, 2026 | TANG KEVIN | 10% Owner | P Purchase | 118,185 | $2.34 | $276,553 |
| Aug 26, 2026 | TANG KEVIN | 10% Owner | S Sale | 18,300 | $2.97 | $54,351 |
| Jul 21, 2026 | TANG KEVIN | 10% Owner | P Purchase | 2,975 | $2.44 | $7,259 |
| Jul 20, 2026 | TANG KEVIN | 10% Owner | P Purchase | 1,623 | $2.44 | $3,960 |
| Jul 17, 2026 | TANG KEVIN | 10% Owner | P Purchase | 265 | $2.44 | $647 |
| Jul 16, 2026 | TANG KEVIN | 10% Owner | P Purchase | 18,491 | $2.44 | $45,118 |
| Jul 15, 2026 | TANG KEVIN | 10% Owner | P Purchase | 1,600 | $2.44 | $3,904 |
| Jul 14, 2026 | TANG KEVIN | 10% Owner | P Purchase | 43,878 | $2.43 | $106,624 |
| Jul 13, 2026 | TANG KEVIN | 10% Owner | P Purchase | 48,211 | $2.42 | $116,671 |
| Jul 10, 2026 | TANG KEVIN | 10% Owner | P Purchase | 43,367 | $2.43 | $105,382 |
| Jul 9, 2026 | TANG KEVIN | 10% Owner | P Purchase | 7 | $2.48 | $17 |
| Jul 8, 2026 | TANG KEVIN | 10% Owner | P Purchase | 14,338 | $2.46 | $35,271 |
| Jul 7, 2026 | TANG KEVIN | 10% Owner | P Purchase | 15,810 | $2.48 | $39,209 |
| Jul 6, 2026 | TANG KEVIN | 10% Owner | P Purchase | 27,062 | $2.49 | $67,384 |
| Jul 2, 2026 | TANG KEVIN | 10% Owner | P Purchase | 9,821 | $2.49 | $24,454 |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P. | 10% Owner | M Exercise | 16,000 | Not measured | Not measured |
| Jul 1, 2026 | TANG KEVIN | 10% Owner | P Purchase | 71,612 | $2.49 | $178,314 |
| Jul 1, 2026 | CRANDELL KEITH | 10% Owner | M Exercise | 16,000 | $1.03 | $16,480 |
| Jul 1, 2026 | CRANDELL KEITH | 10% Owner | S Sale | 16,000 | $2.49 | $39,840 |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P. | 10% Owner | M Exercise | 16,000 | $1.03 | $16,480 |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P. | 10% Owner | S Sale | 16,000 | $2.49 | $39,840 |
| Jul 1, 2026 | CRANDELL KEITH | 10% Owner | M Exercise | 16,000 | Not measured | Not measured |
| Jun 30, 2026 | TANG KEVIN | 10% Owner | P Purchase | 100 | $2.50 | $250 |
| Jun 30, 2026 | TANG KEVIN | 10% Owner | P Purchase | 25,930 | $2.54 | $65,862 |
| Jun 29, 2026 | TANG KEVIN | 10% Owner | P Purchase | 777 | $2.48 | $1,927 |
| Jun 29, 2026 | TANG KEVIN | 10% Owner | P Purchase | 63,985 | $2.47 | $158,043 |
| Jun 26, 2026 | TANG KEVIN | 10% Owner | P Purchase | 75,047 | $2.55 | $191,370 |
| Jun 26, 2026 | TANG KEVIN | 10% Owner | P Purchase | 134 | $2.54 | $340 |
| Jun 25, 2026 | TANG KEVIN | 10% Owner | P Purchase | 145,880 | $2.48 | $361,782 |
| Jun 25, 2026 | TANG KEVIN | 10% Owner | P Purchase | 510 | $2.56 | $1,306 |
| Jun 15, 2026 | Lew Jennifer | Director | A Award | 32,000 | Not measured | Not measured |
| Jun 15, 2026 | Lim Jonathan E | Director | A Award | 48,000 | Not measured | Not measured |
| Jun 15, 2026 | Whiting Nancy | Director | A Award | 32,000 | Not measured | Not measured |
| Jun 15, 2026 | Christensen James | Director | A Award | 32,000 | Not measured | Not measured |
| Jan 23, 2026 | Doebele Robert | Chief Medical Officer | A Award | 230,000 | Not measured | Not measured |
| Jan 23, 2026 | Hornby Zachary | President & CEO | A Award | 600,000 | Not measured | Not measured |
| Jan 23, 2026 | Hassig Christian | Chief Scientific Officer | A Award | 230,000 | Not measured | Not measured |
| Jan 23, 2026 | Oien Jessica | See Remarks | A Award | 220,000 | Not measured | Not measured |
| Jan 23, 2026 | HINKLE DAVID A | See Remarks | A Award | 140,000 | Not measured | Not measured |
| Jun 23, 2025 | Whiting Nancy | Director | A Award | 16,000 | Not measured | Not measured |
| Jun 23, 2025 | Brennan Christine | Director | A Award | 16,000 | Not measured | Not measured |
| Jun 23, 2025 | Burow Kristina | Director | A Award | 16,000 | Not measured | Not measured |
| Jun 23, 2025 | Lew Jennifer | Director | A Award | 16,000 | Not measured | Not measured |
The full Form 4 history is on the BOLD company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.