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Boundless Bio, Inc.

BOLD
Healthcare|Biotechnology|US
$2.46
+0.05 (+2.07%)
Tangible Book / Share
$2.94
Cash / Share
$3.24

Ownership Breakdown

76.9%
Float
22.7M
Shares Outstanding
17.5M
Float Shares

Major Holders (15)

Combined: 87.4%

Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.

HolderType% of ClassSharesFiledFiling
FMR LLCHolding company12.00%2,684,022Feb 5, 202613D/G
Abigail P. JohnsonIndividual12.00%2,684,022Feb 5, 202613D/G
Tang Capital Management, LLCOther11.30%2,533,845Jun 29, 202613D/G
Kevin TangIndividual11.30%2,533,845Jun 29, 202613D/G
Zachary HornbyIndividual9.80%2,426,857Aug 27, 202613D/G
Daniel SchneebergerHC, IN8.80%1,968,216Aug 14, 202613D/G
ADAR1 Capital Management, LLCIA, OO8.80%1,968,216Aug 14, 202613D/G
Tang Capital Partners International, LPPartnership3.50%791,839Jun 29, 202613D/G
Tang Capital Partners IV, IncCorporation2.60%580,669Jun 29, 202613D/G
Tang Capital Partners III, IncCorporation2.60%580,668Jun 29, 202613D/G
Tang Capital Partners, LPPartnership2.60%580,669Jun 29, 202613D/G
Citadel Securities Group LPHC, PN0.60%145,118Aug 14, 202613D/G
Kenneth GriffinHC, IN0.60%145,118Aug 14, 202613D/G
Citadel Securities GP LLCHC, OO0.60%145,118Aug 14, 202613D/G
Citadel Securities LLCBD, OO0.30%65,617Aug 14, 202613D/G

Insider Trades (100)

Last 4 quarters: 2,400,406 acquired · 82,300 disposed
InsiderPositionDateTypeSharesPriceValueFiling
TANG KEVIN10 percent ownerNov 5, 2026BUY8,390$2.40$20.1KForm 4
TANG KEVIN10 percent ownerNov 4, 2026BUY517$2.40$1.2KForm 4
TANG KEVIN10 percent ownerNov 3, 2026BUY2,255$2.40$5.4KForm 4
TANG KEVIN10 percent ownerOct 27, 2026BUY10,707$2.40$25.7KForm 4
TANG KEVIN10 percent ownerOct 26, 2026BUY9,606$2.38$22.9KForm 4
TANG KEVIN10 percent ownerOct 23, 2026BUY6,234$2.38$14.8KForm 4
TANG KEVIN10 percent ownerOct 22, 2026BUY5,800$2.40$13.9KForm 4
TANG KEVIN10 percent ownerOct 20, 2026BUY220$2.37$521.40Form 4
TANG KEVIN10 percent ownerOct 19, 2026BUY18,279$2.33$42.6KForm 4
TANG KEVIN10 percent ownerOct 19, 2026BUY12,790$2.34$29.9KForm 4
TANG KEVIN10 percent ownerOct 16, 2026BUY118,185$2.34$276.6KForm 4
TANG KEVIN10 percent ownerAug 26, 2026SELL18,300$2.97$54.4KForm 4
TANG KEVIN10 percent ownerJul 21, 2026BUY2,975$2.44$7.3KForm 4
TANG KEVIN10 percent ownerJul 20, 2026BUY1,623$2.44$4.0KForm 4
TANG KEVIN10 percent ownerJul 17, 2026BUY265$2.44$646.60Form 4
TANG KEVIN10 percent ownerJul 16, 2026BUY18,491$2.44$45.1KForm 4
TANG KEVIN10 percent ownerJul 15, 2026BUY1,600$2.44$3.9KForm 4
TANG KEVIN10 percent ownerJul 14, 2026BUY43,878$2.43$106.6KForm 4
TANG KEVIN10 percent ownerJul 13, 2026BUY48,211$2.42$116.7KForm 4
TANG KEVIN10 percent ownerJul 10, 2026BUY43,367$2.43$105.4KForm 4
TANG KEVIN10 percent ownerJul 9, 2026BUY7$2.48$17.36Form 4
TANG KEVIN10 percent ownerJul 8, 2026BUY14,338$2.46$35.3KForm 4
TANG KEVIN10 percent ownerJul 7, 2026BUY15,810$2.48$39.2KForm 4
TANG KEVIN10 percent ownerJul 6, 2026BUY27,062$2.49$67.4KForm 4
CRANDELL KEITH10 percent ownerJul 1, 2026OPTION EX.16,000$1.03$16.5KForm 4
CRANDELL KEITH10 percent ownerJul 1, 2026SELL16,000$2.49$39.8KForm 4
CRANDELL KEITH10 percent ownerJul 1, 2026OPTION EX.16,000$1.03$16.5KForm 4
ARCH Venture Fund IX, L.P.10 percent ownerJul 1, 2026OPTION EX.16,000$1.03$16.5KForm 4
ARCH Venture Fund IX, L.P.10 percent ownerJul 1, 2026SELL16,000$2.49$39.8KForm 4
ARCH Venture Fund IX, L.P.10 percent ownerJul 1, 2026OPTION EX.16,000$1.03$16.5KForm 4
TANG KEVIN10 percent ownerJul 2, 2026BUY9,821$2.49$24.5KForm 4
TANG KEVIN10 percent ownerJul 1, 2026BUY71,612$2.49$178.3KForm 4
TANG KEVIN10 percent ownerJun 30, 2026BUY100$2.50$250.00Form 4
TANG KEVIN10 percent ownerJun 30, 2026BUY25,930$2.54$65.9KForm 4
TANG KEVIN10 percent ownerJun 29, 2026BUY777$2.48$1.9KForm 4
TANG KEVIN10 percent ownerJun 29, 2026BUY63,985$2.47$158.0KForm 4
TANG KEVIN10 percent ownerJun 26, 2026BUY134$2.54$340.36Form 4
TANG KEVIN10 percent ownerJun 26, 2026BUY75,047$2.55$191.4KForm 4
TANG KEVIN10 percent ownerJun 25, 2026BUY510$2.56$1.3KForm 4
TANG KEVIN10 percent ownerJun 25, 2026BUY145,880$2.48$361.8KForm 4
TANG KEVIN10 percent ownerJun 25, 2026OTHER0——Form 4
Whiting NancydirectorJun 15, 2026AWARD32,000$1.40$44.8KForm 4
Lim Jonathan EdirectorJun 15, 2026AWARD48,000$1.40$67.2KForm 4
Christensen JamesdirectorJun 15, 2026AWARD32,000$1.40$44.8KForm 4
Lew JenniferdirectorJun 15, 2026AWARD32,000$1.40$44.8KForm 4
Oien JessicaSee RemarksJan 23, 2026AWARD220,000$1.26$277.2KForm 4
Hassig ChristianChief Scientific OfficerJan 23, 2026AWARD230,000$1.26$289.8KForm 4
Doebele RobertChief Medical OfficerJan 23, 2026AWARD230,000$1.26$289.8KForm 4
Hornby Zacharydirector, officer: President & CEOJan 23, 2026AWARD600,000$1.26$756.0KForm 4
HINKLE DAVID ASee RemarksJan 23, 2026AWARD140,000$1.26$176.4KForm 4
Brennan ChristinedirectorJun 23, 2025AWARD16,000$1.03$16.5KForm 4
Christensen JamesdirectorJun 23, 2025AWARD16,000$1.03$16.5KForm 4
Lew JenniferdirectorJun 23, 2025AWARD16,000$1.03$16.5KForm 4
Lim Jonathan EdirectorJun 23, 2025AWARD24,000$1.03$24.7KForm 4
Burow Kristinadirector, 10 percent owner: Jun 23, 2025AWARD16,000$1.03$16.5KForm 4
Whiting NancydirectorJun 23, 2025AWARD16,000$1.03$16.5KForm 4
Doebele RobertChief Medical OfficerFeb 3, 2025AWARD180,000$2.23$401.4KForm 4
Doebele RobertFeb 3, 2025OTHER0——Form 4
HINKLE DAVID ASee RemarksJan 22, 2025AWARD65,000$2.57$167.1KForm 4
Hassig ChristianChief Scientific OfficerJan 22, 2025AWARD95,000$2.57$244.1KForm 4
Hornby Zacharydirector, officer: President & CEOJan 22, 2025AWARD295,000$2.57$758.1KForm 4
Oien JessicaSee RemarksJan 22, 2025AWARD90,000$2.57$231.3KForm 4
HINKLE DAVID ASee RemarksOct 11, 2024OTHER0——Form 4
HINKLE DAVID ASee RemarksOct 11, 2024OTHER13,915——Form 4
Hassig ChristianChief Scientific OfficerAug 19, 2024AWARD94,871$3.56$337.7KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024AWARD76,173$3.56$271.2KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024AWARD62,820$3.56$223.6KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024AWARD48,703$3.56$173.4KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024AWARD10,256$3.56$36.5KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024DISPOSED10,256$3.71$38.0KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024DISPOSED48,703$16.00$779.2KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024DISPOSED76,173$8.19$623.9KForm 4
Hassig ChristianChief Scientific OfficerAug 19, 2024DISPOSED94,871$4.10$389.0KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD42,051$3.56$149.7KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD35,897$3.56$127.8KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD32,051$3.56$114.1KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD29,148$3.56$103.8KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD26,090$3.56$92.9KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD16,234$3.56$57.8KForm 4
Oien JessicaSee RemarksAug 19, 2024AWARD10,200$3.56$36.3KForm 4
Oien JessicaSee RemarksAug 19, 2024DISPOSED16,234$16.00$259.7KForm 4
Oien JessicaSee RemarksAug 19, 2024DISPOSED26,090$8.19$213.7KForm 4
Oien JessicaSee RemarksAug 19, 2024DISPOSED35,897$4.49$161.2KForm 4
Oien JessicaSee RemarksAug 19, 2024DISPOSED42,051$4.10$172.4KForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024AWARD471,282$3.56$1.7MForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024AWARD257,207$3.56$915.7KForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024AWARD256,410$3.56$912.8KForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024AWARD162,343$3.56$577.9KForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024DISPOSED257,207$8.19$2.1MForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024DISPOSED471,282$4.10$1.9MForm 4
Hornby Zacharydirector, officer: President & CEOAug 19, 2024DISPOSED162,343$16.00$2.6MForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024AWARD82,051$3.56$292.1KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024AWARD54,871$3.56$195.3KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024AWARD36,852$3.56$131.2KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024AWARD23,191$3.56$82.6KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024AWARD19,948$3.56$71.0KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024DISPOSED23,191$16.00$371.1KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024DISPOSED36,852$8.19$301.8KForm 4
Abdollahian NeilChief Business OfficerAug 19, 2024DISPOSED54,871$4.10$225.0KForm 4
Wagner Klaus W.Chief Medical OfficerAug 19, 2024AWARD102,564$3.56$365.1KForm 4