United States Biotechnology & Medical Research

Boundless Bio Inc (BOLD)

Boundless Bio Inc witnessed significant insider trading activity recently, primarily driven by Kevin Tang. Over the past ninety days, eight transactions occurred, resulting in a net positive value of approximately $346,861. Despite a negative earnings report in August, these acquisitions reflect notable accumulation patterns following recent stock price fluctuations within the healthcare sector.
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
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
463.90
Quantity 40,991 -9.1%
Value US$2,872,893
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
30.72
Quantity 95,093 -21.8%
Value US$1,897,181
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
458.97
Quantity 95,945 +17.8%
Value US$3,206,990
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.40
Quantity 1,000 +0.2%
Value US$100,000
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.37
Quantity 1,000 +0.0%
Value US$100,000
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.33
Quantity 1,000 +0.6%
Value US$100,000
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.34
Quantity 1,000 +0.4%
Value US$100,000
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.34
Quantity 1,000 +4.2%
Value US$100,000
3.3
TANG KEVIN Large shareholder
Transaction date
Sale
Price
2.97
Quantity 18,300 -0.6%
Value US$54,351
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.44
Quantity 2,975 +0.1%
Value US$7,259
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.44
Quantity 1,623 +0.1%
Value US$3,960
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.44
Quantity 265 +0.0%
Value US$647
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.44
Quantity 18,491 +0.7%
Value US$45,118
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.44
Quantity 1,600 +0.1%
Value US$3,904
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.43
Quantity 43,878 +1.6%
Value US$106,624
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.42
Quantity 48,211 +1.8%
Value US$116,671
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.43
Quantity 43,367 +1.6%
Value US$105,382
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.48
Quantity 7 +0.0%
Value US$17
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.46
Quantity 14,338 +0.5%
Value US$35,271
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.48
Quantity 15,810 +0.6%
Value US$39,209
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.49
Quantity 27,062 +1.0%
Value US$67,384
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.49
Quantity 9,821 +0.4%
Value US$24,454
1.6
CRANDELL KEITH Large shareholder
Transaction date
Sale
Price
2.49
Quantity 16,000 -100.0%
Value US$39,840
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.49
Quantity 71,612 +2.8%
Value US$178,314
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.50
Quantity 100 +0.0%
Value US$250
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.54
Quantity 25,930 +1.0%
Value US$65,862
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.48
Quantity 777 +0.0%
Value US$1,927
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.47
Quantity 63,985 +2.6%
Value US$158,043
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.54
Quantity 134 +0.0%
Value US$340
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.55
Quantity 75,047 +3.1%
Value US$191,370
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.56
Quantity 510 +0.0%
Value US$1,306
3.3
TANG KEVIN Large shareholder
Transaction date
Purchase
Price
2.48
Quantity 145,880 +6.5%
Value US$361,782
1.6
CRANDELL KEITH Large shareholder
Transaction date
Purchase
Price
16.00
Quantity 133,333 +12.7%
Value US$2,133,328
1.6
CRANDELL KEITH Large shareholder
Transaction date
Purchase
Price
16.00
Quantity 66,667 +10.8%
Value US$1,066,672
3.2
Burow Kristina Non-Executive Director Large shareholder
Transaction date
Purchase
Price
16.00
Quantity 133,333 +12.7%
Value US$2,133,328
3.2
Burow Kristina Non-Executive Director Large shareholder
Transaction date
Purchase
Price
16.00
Quantity 66,667 +10.8%
Value US$1,066,672
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-10-29 2026-10-27 B Purchase
3.3
TANG KEVIN
Large shareholder
40,991 -9.1%
463.90
US$2,872,893 		40,991 -9.1% 463.90 US$2,872,893
2026-10-26 2026-10-26 B Purchase
3.3
TANG KEVIN
Large shareholder
95,093 -21.8%
30.72
US$1,897,181 		95,093 -21.8% 30.72 US$1,897,181
2026-10-26 2026-10-23 B Purchase
3.3
TANG KEVIN
Large shareholder
95,945 +17.8%
458.97
US$3,206,990 		95,945 +17.8% 458.97 US$3,206,990
2026-10-26 2026-10-22 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.2%
2.40
US$100,000 		1,000 +0.2% 2.40 US$100,000
2026-10-20 2026-10-20 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.0%
2.37
US$100,000 		1,000 +0.0% 2.37 US$100,000
2026-10-20 2026-10-19 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.6%
2.33
US$100,000 		1,000 +0.6% 2.33 US$100,000
2026-10-20 2026-10-19 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +0.4%
2.34
US$100,000 		1,000 +0.4% 2.34 US$100,000
2026-10-20 2026-10-16 B Purchase
3.3
TANG KEVIN
Large shareholder
1,000 +4.2%
2.34
US$100,000 		1,000 +4.2% 2.34 US$100,000
2026-08-28 2026-08-26 S Sale
3.3
TANG KEVIN
Large shareholder
18,300 -0.6%
2.97
US$54,351 		18,300 -0.6% 2.97 US$54,351
2026-07-21 2026-07-21 B Purchase
3.3
TANG KEVIN
Large shareholder
2,975 +0.1%
2.44
US$7,259 		2,975 +0.1% 2.44 US$7,259
2026-07-21 2026-07-20 B Purchase
3.3
TANG KEVIN
Large shareholder
1,623 +0.1%
2.44
US$3,960 		1,623 +0.1% 2.44 US$3,960
2026-07-21 2026-07-17 B Purchase
3.3
TANG KEVIN
Large shareholder
265 +0.0%
2.44
US$647 		265 +0.0% 2.44 US$647
2026-07-16 2026-07-16 B Purchase
3.3
TANG KEVIN
Large shareholder
18,491 +0.7%
2.44
US$45,118 		18,491 +0.7% 2.44 US$45,118
2026-07-16 2026-07-15 B Purchase
3.3
TANG KEVIN
Large shareholder
1,600 +0.1%
2.44
US$3,904 		1,600 +0.1% 2.44 US$3,904
2026-07-16 2026-07-14 B Purchase
3.3
TANG KEVIN
Large shareholder
43,878 +1.6%
2.43
US$106,624 		43,878 +1.6% 2.43 US$106,624
2026-07-13 2026-07-13 B Purchase
3.3
TANG KEVIN
Large shareholder
48,211 +1.8%
2.42
US$116,671 		48,211 +1.8% 2.42 US$116,671
2026-07-13 2026-07-10 B Purchase
3.3
TANG KEVIN
Large shareholder
43,367 +1.6%
2.43
US$105,382 		43,367 +1.6% 2.43 US$105,382
2026-07-13 2026-07-09 B Purchase
3.3
TANG KEVIN
Large shareholder
7 +0.0%
2.48
US$17 		7 +0.0% 2.48 US$17
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
1.6
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
1.6
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
1.6
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
1.6
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
1.6
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
1.6
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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