United States Biotechnology & Medical Research

Boundless Bio Inc (BOLD)

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Over the past 90 days, Boundless Bio Inc. saw 24 insider transactions, resulting in a net positive value of approximately $1.44 million. Kevin Tang has been the primary buyer, executing multiple purchase transactions. Conversely, Keith Crandell recorded a sale. These activities occur amid a 63.2% stock price increase over the last quarter.
Ticker: BOLD Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Boundless Bio Inc. Upgrade to see score, net flow, insiders and the full signal context.

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Top insiders
Trades
Buy 21 Jul 2026
Value US$3,103,834.93 | Price 131.76 | Shares 34,341 (-12.1%)
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-07-21 2026-07-21 B Purchase
3.3
TANG KEVIN
Large shareholder
34,341 -12.1%
131.76
US$3,103,835 		34,341 -12.1% 131.76 US$3,103,835
2026-07-21 2026-07-20 B Purchase
3.3
TANG KEVIN
Large shareholder
19,272 +16.3%
23.50
US$4,244,190 		19,272 +16.3% 23.50 US$4,244,190
2026-07-21 2026-07-17 B Purchase
3.3
TANG KEVIN
Large shareholder
10,327 -15.0%
301.70
US$805,410 		10,327 -15.0% 301.70 US$805,410
2026-07-16 2026-07-16 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.7%
2.44
US$100,000 		1,000 +0.7% 2.44 US$100,000
2026-07-16 2026-07-15 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.1%
2.44
US$100,000 		1,000 +0.1% 2.44 US$100,000
2026-07-16 2026-07-14 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +1.6%
2.43
US$100,000 		1,000 +1.6% 2.43 US$100,000
2026-07-13 2026-07-13 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +1.8%
2.42
US$100,000 		1,000 +1.8% 2.42 US$100,000
2026-07-13 2026-07-10 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +1.6%
2.43
US$100,000 		1,000 +1.6% 2.43 US$100,000
2026-07-13 2026-07-09 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.0%
2.48
US$100,000 		1,000 +0.0% 2.48 US$100,000
2026-07-08 2026-07-08 B Purchase
3.3
TANG KEVIN
Large shareholder
14,338 +0.5%
2.46
US$35,271 		14,338 +0.5% 2.46 US$35,271
2026-07-08 2026-07-07 B Purchase
3.3
TANG KEVIN
Large shareholder
15,810 +0.6%
2.48
US$39,209 		15,810 +0.6% 2.48 US$39,209
2026-07-08 2026-07-06 B Purchase
3.3
TANG KEVIN
Large shareholder
27,062 +1.0%
2.49
US$67,384 		27,062 +1.0% 2.49 US$67,384
2026-07-02 2026-07-02 B Purchase
3.3
TANG KEVIN
Large shareholder
9,821 +0.4%
2.49
US$24,454 		9,821 +0.4% 2.49 US$24,454
2026-07-06 2026-07-01 S Sale
CRANDELL KEITH
Large shareholder
16,000 -100.0%
2.49
US$39,840 		16,000 -100.0% 2.49 US$39,840
2026-07-06 2026-07-01 S Sale
ARCH Venture Fund IX, L.P.
Large shareholder
16,000 -100.0%
2.49
US$39,840 		16,000 -100.0% 2.49 US$39,840
2026-07-02 2026-07-01 B Purchase
3.3
TANG KEVIN
Large shareholder
71,612 +2.8%
2.49
US$178,314 		71,612 +2.8% 2.49 US$178,314
2026-07-02 2026-06-30 B Purchase
3.3
TANG KEVIN
Large shareholder
100 +0.0%
2.50
US$250 		100 +0.0% 2.50 US$250
2026-07-02 2026-06-30 B Purchase
3.3
TANG KEVIN
Large shareholder
25,930 +1.0%
2.54
US$65,862 		25,930 +1.0% 2.54 US$65,862
2026-06-29 2026-06-29 B Purchase
3.3
TANG KEVIN
Large shareholder
777 +0.0%
2.48
US$1,927 		777 +0.0% 2.48 US$1,927
2026-06-29 2026-06-29 B Purchase
3.3
TANG KEVIN
Large shareholder
63,985 +2.6%
2.47
US$158,043 		63,985 +2.6% 2.47 US$158,043
2026-06-29 2026-06-26 B Purchase
3.3
TANG KEVIN
Large shareholder
134 +0.0%
2.54
US$340 		134 +0.0% 2.54 US$340
2026-06-29 2026-06-26 B Purchase
3.3
TANG KEVIN
Large shareholder
75,047 +3.1%
2.55
US$191,370 		75,047 +3.1% 2.55 US$191,370
2026-06-29 2026-06-25 B Purchase
3.3
TANG KEVIN
Large shareholder
510 +0.0%
2.56
US$1,306 		510 +0.0% 2.56 US$1,306
2026-06-29 2026-06-25 B Purchase
3.3
TANG KEVIN
Large shareholder
145,880 +6.5%
2.48
US$361,782 		145,880 +6.5% 2.48 US$361,782
2024-04-04 2024-04-02 B Purchase
ARCH Venture Fund IX, L.P.
Large shareholder
133,333 +12.7%
16.00
US$2,133,328 		133,333 +12.7% 16.00 US$2,133,328
2024-04-04 2024-04-02 B Purchase
ARCH Venture Fund IX, L.P.
Large shareholder
66,667 +10.8%
16.00
US$1,066,672 		66,667 +10.8% 16.00 US$1,066,672
2024-04-04 2024-04-02 B Purchase
2.9
RA CAPITAL MANAGEMENT, L.P.
Large shareholder
15,625 +5.6%
16.00
US$250,000 		15,625 +5.6% 16.00 US$250,000
2024-04-04 2024-04-02 B Purchase
2.9
RA CAPITAL MANAGEMENT, L.P.
Large shareholder
296,875 +18.7%
16.00
US$4,750,000 		296,875 +18.7% 16.00 US$4,750,000
2024-04-04 2024-04-02 B Purchase
CRANDELL KEITH
Large shareholder
133,333 +12.7%
16.00
US$2,133,328 		133,333 +12.7% 16.00 US$2,133,328
2024-04-04 2024-04-02 B Purchase
CRANDELL KEITH
Large shareholder
66,667 +10.8%
16.00
US$1,066,672 		66,667 +10.8% 16.00 US$1,066,672
2024-04-04 2024-04-02 B Purchase
3.2
Burow Kristina
Non-Executive Director Large shareholder
133,333 +12.7%
16.00
US$2,133,328 		133,333 +12.7% 16.00 US$2,133,328
2024-04-04 2024-04-02 B Purchase
3.2
Burow Kristina
Non-Executive Director Large shareholder
66,667 +10.8%
16.00
US$1,066,672 		66,667 +10.8% 16.00 US$1,066,672
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