Quick Takeaways
- BOLD - Boundless Bio, Inc. has 18 insiders with reported activity on this page.
- No net insider buy/sell flow is currently reported for the last year.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 18 Insiders of Boundless Bio, Inc.
- Symbol
- BOLD on Nasdaq
- Location
- San Diego, CA
What Changed
- No meaningful buy/sell imbalance is currently visible in the one-year window.
- Activity will update as new Forms 3/4/5 are filed.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsInsider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 27 Apr 2025.
Buys
$0
Shares: 0
Insiders: 0
Sells
$0
Shares: 0
Insiders: 0
Net
$0
Shares: 0
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Boundless Bio, Inc. executives and other stock owners filed with the SEC include:
Top shareholders of Boundless Bio, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
|
Company |
12%
from 13D/G
|
2,684,022
|
$3,220,826 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13D/G
13F
|
Kenneth Griffin · Company |
6.4%
|
1,433,388
|
$1,763,067 | $0 | 26 Nov 2025 | |
| Stonepine Capital Management, LLC |
13F
|
Company |
3.2%
|
710,071
|
$852,085 | — | 31 Dec 2025 | |
| SECTORAL ASSET MANAGEMENT INC |
13F
|
Company |
3%
|
678,574
|
$814,289 | — | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
3%
|
662,757
|
$795,308 | — | 31 Dec 2025 | |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
|
Company |
2.5%
|
556,233
|
$667,480 | — | 31 Dec 2025 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
|
Company |
1.5%
|
341,400
|
$409,680 | — | 31 Dec 2025 | |
| Alyeska Investment Group, L.P. |
13F
|
Company |
1.3%
|
300,000
|
$360,000 | — | 31 Dec 2025 | |
| RBF Capital, LLC |
13F
|
Company |
0.89%
|
200,000
|
$240,000 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.85%
|
189,475
|
$227,370 | — | 31 Dec 2025 | |
| Ensign Peak Advisors, Inc |
13F
|
Company |
0.84%
|
187,500
|
$225,000 | — | 31 Dec 2025 | |
| Sio Capital Management, LLC |
13F
|
Company |
0.73%
|
163,679
|
$196,415 | — | 31 Dec 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
0.61%
|
135,410
|
$162,492 | — | 31 Dec 2025 | |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. |
13F
|
Company |
0.57%
|
127,626
|
$153,151 | — | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
0.42%
|
94,098
|
$112,917 | — | 31 Dec 2025 | |
| BlackRock, Inc. |
13F
|
Company |
0.3%
|
67,048
|
$80,457 | — | 31 Dec 2025 | |
| GSA CAPITAL PARTNERS LLP |
13F
|
Company |
0.28%
|
62,476
|
$75,000 | — | 31 Dec 2025 | |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC |
13F
|
Company |
0.23%
|
50,500
|
$60,600 | — | 31 Dec 2025 | |
| Walleye Capital LLC |
13F
|
Company |
0.18%
|
39,624
|
$47,549 | — | 31 Dec 2025 | |
| XTX Topco Ltd |
13F
|
Company |
0.18%
|
39,577
|
$47,492 | — | 31 Dec 2025 | |
| CITIGROUP INC |
13F
|
Company |
0.11%
|
25,073
|
$30,088 | — | 31 Dec 2025 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
0.08%
|
18,707
|
$22,448 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
0.07%
|
15,962
|
$19,154 | — | 31 Dec 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.06%
|
13,323
|
$15,988 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
0.06%
|
13,000
|
$15,600 | — | 31 Dec 2025 | |
| Abel Hall, LLC |
13F
|
Company |
0.06%
|
12,865
|
$15,438 | — | 31 Dec 2025 | |
| ACADIAN ASSET MANAGEMENT LLC |
13F
|
Company |
0.06%
|
12,610
|
$14,000 | — | 31 Dec 2025 | |
| Nolet Wealth Management, LLC |
13F
|
Company |
0.05%
|
11,323
|
$13,588 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.03%
|
7,758
|
$9,310 | — | 31 Dec 2025 | |
| Tower Research Capital LLC (TRC) |
13F
|
Company |
0.03%
|
5,803
|
$6,964 | — | 31 Dec 2025 | |
| BNP PARIBAS FINANCIAL MARKETS |
13F
|
Company |
0%
|
176
|
$211 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
0%
|
169
|
$203 | — | 31 Dec 2025 | |
| Optiver Holding B.V. |
13F
|
Company |
0%
|
168
|
$202 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
0%
|
23
|
$27 | — | 31 Dec 2025 | |
| BARCLAYS PLC |
13F
|
Company |
0%
|
2
|
$2 | — | 31 Dec 2025 | |
| ARCH Venture Fund IX, L.P. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
1,181,766
|
— | — | 02 Apr 2024 | |
| Keith Crandell |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
1,181,766
|
— | — | 02 Apr 2024 | |
| Zachary Hornby |
3/4/5
|
President & CEO, Director |
—
class O/S missing
|
600,000
|
— | — | 23 Jan 2026 | |
| Wellington Biomedical Innovation Master Investors (Cayman) I L.P. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
556,233
|
— | — | 02 Apr 2024 | |
| Robert Doebele |
3/4/5
|
Chief Medical Officer |
—
mixed-class rows
|
410,000
mixed-class rows
|
— | — | 23 Jan 2026 | |
| RA CAPITAL MANAGEMENT, L.P. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
295,844
|
— | — | 02 Apr 2024 | |
| Ph.D. Christian Hassig |
3/4/5
|
Chief Scientific Officer |
—
class O/S missing
|
230,000
|
— | — | 23 Jan 2026 | |
| Jessica Oien |
3/4/5
|
Chief Legal Officer and Corporate Secretary |
—
class O/S missing
|
220,000
|
— | — | 23 Jan 2026 | |
| David A. Hinkle |
3/4/5
|
Senior VP, Finance, Controller and Treasurer |
—
class O/S missing
|
140,000
|
— | — | 23 Jan 2026 | |
| Klaus W. Wagner |
3/4/5
|
Chief Medical Officer |
—
class O/S missing
|
83,490
|
— | — | 19 Aug 2024 | |
| Jami Rubin |
3/4/5
|
Chief Financial Officer |
—
class O/S missing
|
64,936
|
— | — | 19 Aug 2024 | |
| Neil Abdollahian |
3/4/5
|
Chief Business Officer |
—
class O/S missing
|
46,382
|
— | — | 19 Aug 2024 | |
| Jonathan E. Lim |
3/4/5
|
Director |
—
class O/S missing
|
24,000
|
— | — | 23 Jun 2025 | |
| Christine Brennan |
3/4/5
|
Director |
—
class O/S missing
|
16,000
|
— | — | 23 Jun 2025 | |
| James Christensen |
3/4/5
|
Director |
—
class O/S missing
|
16,000
|
— | — | 23 Jun 2025 |
Recent Insider Transactions by Companies or Individuals for Boundless Bio, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Robert Doebele | BOLD | Stock Option (right to buy) | Award | 230,000 | 230,000 | 23 Jan 2026 | Direct | |||
| Jessica Oien | BOLD | Stock Option (right to buy) | Award | 220,000 | 220,000 | 23 Jan 2026 | Direct | |||
| Ph.D. Christian Hassig | BOLD | Stock Option (right to buy) | Award | 230,000 | 230,000 | 23 Jan 2026 | Direct | |||
| Zachary Hornby | BOLD | Stock Option (right to buy) | Award | 600,000 | 600,000 | 23 Jan 2026 | Direct | |||
| David A. Hinkle | BOLD | Stock Option (right to buy) | Award | 140,000 | 140,000 | 23 Jan 2026 | Direct | |||
| Christine Brennan | BOLD | Stock Option (right to buy) | Award | 16,000 | 16,000 | 23 Jun 2025 | Direct | |||
| James Christensen | BOLD | Stock Option (right to buy) | Award | 16,000 | 16,000 | 23 Jun 2025 | Direct | |||
| Jennifer Lew | BOLD | Stock Option (right to buy) | Award | 16,000 | 16,000 | 23 Jun 2025 | Direct | |||
| Jonathan E. Lim | BOLD | Stock Option (right to buy) | Award | 24,000 | 24,000 | 23 Jun 2025 | Direct | |||
| Kristina Burow | BOLD | Stock Option (right to buy) | Award | 16,000 | 16,000 | 23 Jun 2025 | Direct | |||
| Nancy Whiting | BOLD | Stock Option (right to buy) | Award | 16,000 | 16,000 | 23 Jun 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.