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Buy Day today: Neutral (46) Mixed market breadth · no major macro event
BOLD

Boundless Bio, Inc.

Healthcare · Biotechnology

2.50$ -0.4% vs. previous close Closing price · As of: Oct 30, 2026

Ownership

Ownership Structure

Who owns Boundless Bio, Inc. (BOLD)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 68.3% of the shares are freely tradable; institutional investors hold 49.7%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 49.7%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 11.4%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 68.3%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 5.5%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 23Mio.

Largest Shareholders

Institutions

Institutions BOLD
Name Stake (%) Shares Change (%) Date
ARCH VENTURE CORP 11.66 2,694,095 +0.0 06/30/2026
FMR Inc 11.17 2,581,055 -4.2 06/30/2026
TANG CAPITAL MANAGEMENT LLC 11.08 2,559,875 +0.0 06/30/2026
ADAR1 Capital Management LLC 8.52 1,968,216 +0.0 06/30/2026
Cormorant Asset Management, LLC 4.33 1,000,000 +0.0 06/30/2026
Vanguard Capital Management, LLC 2.66 614,923 +3.0 06/30/2026
Wellington Management Company LLP 2.41 556,233 +0.0 06/30/2026
Millennium Management LLC 2.07 478,639 +379.2 06/30/2026
Renaissance Technologies Corp 2.04 471,570 +18.2 06/30/2026

Funds

Funds BOLD
Name Stake (%) Shares Change (%) Date
Fidelity Growth Company Fund 3.89 899,159 +0.0 08/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider holdings

Insider holdings BOLD
Person Role Shares Value As of Type
Tang Kevin 10% Owner 5,720,974 14,302,435 $ Jul 8, 2026 indirect

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Oct 27, 2026 Tang Kevin 10% Owner Buy 10,707 2.40 25,697
Oct 26, 2026 Tang Kevin 10% Owner Buy 9,606 2.38 22,862
Oct 23, 2026 Tang Kevin 10% Owner Buy 6,234 2.38 14,837
Oct 22, 2026 Tang Kevin 10% Owner Buy 5,800 2.40 13,920
Oct 20, 2026 Tang Kevin 10% Owner Buy 220 2.37 521
Oct 19, 2026 Tang Kevin 10% Owner Buy 18,279 2.33 42,590
Oct 19, 2026 Tang Kevin 10% Owner Buy 12,790 2.34 29,929
Oct 16, 2026 Tang Kevin 10% Owner Buy 118,185 2.34 276,553
Aug 26, 2026 Tang Kevin 10% Owner Sell 18,300 2.97 54,351
Jul 21, 2026 Tang Kevin 10% Owner Buy 2,975 2.44 7,259
Jul 20, 2026 Tang Kevin 10% Owner Buy 1,623 2.44 3,960
Jul 17, 2026 Tang Kevin 10% Owner Buy 265 2.44 647
Jul 16, 2026 Tang Kevin 10% Owner Buy 18,491 2.44 45,118
Jul 15, 2026 Tang Kevin 10% Owner Buy 1,600 2.44 3,904
Jul 14, 2026 Tang Kevin 10% Owner Buy 43,878 2.43 106,624
Jul 13, 2026 Tang Kevin 10% Owner Buy 48,211 2.42 116,671
Jul 10, 2026 Tang Kevin 10% Owner Buy 43,367 2.43 105,382
Jul 9, 2026 Tang Kevin 10% Owner Buy 7 2.48 17
Jul 8, 2026 Tang Kevin 10% Owner Buy 14,338 2.46 35,271
Jul 7, 2026 Tang Kevin 10% Owner Buy 15,810 2.48 39,209
Jul 6, 2026 Tang Kevin 10% Owner Buy 27,062 2.49 67,384

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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