BOLD

Boundless Bio, Inc.$2.50+0.04 (+1.42%)

Prev Close$2.46·MCap$25.5M·P/E—·Vol102.0K·Yield—

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Buys (12M)

$1.35M

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Sells (12M)

$79.7K

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Net Activity

Net Buyer

$1.27M

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Active Insiders

last 12 mo

Over the past 12 months, insider activity at Boundless Bio, Inc. (BOLD) has been dominated by buying, with 4 insider purchases totaling $1.35M and 2 insider sales totaling $79.7K. The most recent insider transaction was by TANG KEVIN (10 percent owner), who purchased $222.1K worth of shares on Jul 13, 2026. Boundless Bio, Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $25.5M.

BOLD Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Jul 13, 2026	TANG KEVIN	10 percent owner	Buy	91,585	$2.42	$222.1K	2,790,103
Jul 8, 2026	TANG KEVIN	10 percent owner	Buy	57,210	$2.48	$141.9K	2,698,518
Jul 6, 2026	ARCH Venture Fund IX, L.P.	10 percent owner	Sell	16,000	$2.49	$39.8K	0Exit
Jul 6, 2026	CRANDELL KEITH	10 percent owner	Sell	16,000	$2.49	$39.8K	0Exit
Jul 2, 2026	TANG KEVIN	10 percent owner	Buy	107,463	$2.50	$268.9K	2,641,308
Jun 29, 2026	TANG KEVIN	10 percent owner	Buy	286,333	$2.50	$714.8K1.3% OS	2,533,845
Apr 2, 2024	Burow Kristina	Director	Buy	200,000	$16.00	$3.20M0.9% OS	0

BOLD Insider Buying Activity

The following table shows recent insider purchases of Boundless Bio, Inc. (BOLD) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Jul 13, 2026	TANG KEVIN	10 percent owner	Buy	91,585	$2.42	$222.1K	2,790,103
Jul 8, 2026	TANG KEVIN	10 percent owner	Buy	57,210	$2.48	$141.9K	2,698,518
Jul 2, 2026	TANG KEVIN	10 percent owner	Buy	107,463	$2.50	$268.9K	2,641,308
Jun 29, 2026	TANG KEVIN	10 percent owner	Buy	286,333	$2.50	$714.8K1.3% OS	2,533,845
Apr 2, 2024	Burow Kristina	Director	Buy	200,000	$16.00	$3.20M0.9% OS	0