Boundless Bio, Inc.
Boundless Bio, Inc. (BOLD) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · BOLD · as of Sep 30, 2025
Ownership Breakdown
34
Institutional Holders
▼ 9 vs Q2
$11.83M
Total Inst. Value
▲ $1.95M vs Q2
22.46M
Shares Outstanding
freeFloat 76.59%
9.62M
13F Shares Held
▼ 165,900 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
BOLD largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC pharmaceutical preparations | 3.10M | 13.86% | 13.86% | $3.81B | Nov 13, 2025 | ▼ 27.0K |
NEXTECH INVEST, LTD. pharmaceutical preparations | 1.23M | 5.49% | 5.49% | $1.51B | Nov 14, 2025 | — held |
CITADEL ADVISORS LLC pharmaceutical preparations | 876.4K | 3.92% | 3.92% | $1.08B | Nov 14, 2025 | ▲ 45.5K |
SECTORAL ASSET MANAGEMENT INC pharmaceutical preparations | 678.6K | 3.04% | 3.04% | $834.65M | Nov 14, 2025 | — held |
VANGUARD GROUP INC pharmaceutical preparations | 569.7K | 2.55% | 2.55% | $700.68M | Nov 7, 2025 | ▲ 88.4K |
WELLINGTON MANAGEMENT GROUP LLP pharmaceutical preparations | 556.2K | 2.49% | 2.49% | $684.17M | Nov 14, 2025 | — held |
STONEPINE CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 413.5K | 1.85% | 1.85% | $508.55M | Nov 13, 2025 | ▲ 307.3K |
ALYESKA INVESTMENT GROUP, L.P. pharmaceutical preparations | 300.0K | 1.34% | 1.34% | $369.00M | Nov 17, 2025 | — held |
REDMILE GROUP, LLC pharmaceutical preparations | 245.5K | 1.10% | 1.10% | $301.91M | Nov 14, 2025 | ▼ 343.6K |
RENAISSANCE TECHNOLOGIES LLC pharmaceutical preparations | 223.6K | 100.00% | 100.00% | $274.98M | Nov 13, 2025 | ▲ 102.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
7
Increased
+620.6K shares1
New Positions
first time holders14
Decreased
−663.8K shares10
Sold Out
fully exitedNet shares change (top 50)
43.3K
+620.6K / −663.8K
Net new holders
-16
1 new / 10 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
BOLD insider trading · insider activity
Source: SEC Form 4
6
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Oien Jessica See Remarks | Jan 23, 2026 | Award | 220,000 | $1.26 | $277.2K | 220.0K | Form 4 ↗ |
Hassig Christian Chief Scientific Officer | Jan 23, 2026 | Award | 230,000 | $1.26 | $289.8K | 230.0K | Form 4 ↗ |
Doebele Robert Chief Medical Officer | Jan 23, 2026 | Award | 230,000 | $1.26 | $289.8K | 230.0K | Form 4 ↗ |
Hornby Zachary President & CEO | Jan 23, 2026 | Award | 600,000 | $1.26 | $756.0K | 600.0K | Form 4 ↗ |
HINKLE DAVID A See Remarks | Jan 23, 2026 | Award | 140,000 | $1.26 | $176.4K | 140.0K | Form 4 ↗ |
Brennan Christine director | Jun 23, 2025 | Award | 16,000 | $1.03 | $16.5K | 16.0K | Form 4 ↗ |
Christensen James director | Jun 23, 2025 | Award | 16,000 | $1.03 | $16.5K | 16.0K | Form 4 ↗ |
Lew Jennifer director | Jun 23, 2025 | Award | 16,000 | $1.03 | $16.5K | 16.0K | Form 4 ↗ |
Lim Jonathan E director | Jun 23, 2025 | Award | 24,000 | $1.03 | $24.7K | 24.0K | Form 4 ↗ |
Burow Kristina
| Jun 23, 2025 | Award | 16,000 | $1.03 | $16.5K | 16.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Boundless Bio, Inc. (BOLD) is primarily owned by institutional investors, who hold approximately 42.8% of total shares outstanding. Company insiders own approximately 23.41%, while retail and public investors account for the remaining 33.76%.
The largest institutional shareholder of Boundless Bio, Inc. is FMR LLC, holding approximately 3.10 million shares — equal to 13.86% of outstanding shares — as of September 30, 2025.
A total of 34 institutional investors currently hold BOLD stock, with a combined institutional value of approximately $11,833,310 as of the most recent 13F filing period.
Frequently asked questions
BOLD ownershipBoundless Bio, Inc. (BOLD) is primarily owned by institutional investors, who hold approximately 42.8% of shares. The largest shareholder is FMR LLC with a 13.86% stake. Company insiders hold 23.41%. Data sourced from SEC Form 13F as of September 30, 2025.