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BOLD Insider Trading

Insider Ownership Percentage: 23.10%
Insider Buying (Last 12 Months): $644,684.54
Insider Selling (Last 12 Months): $79,680.00

Boundless Bio Insider Trading History Chart

This chart shows the insider buying and selling history at Boundless Bio by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Boundless Bio Share Price & Price History

Current Price: $2.83
Price Change: +0.30 (1.20%)
As of 08/14/2026 04:00 PM ET

This chart shows the closing price history over time for BOLD up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Boundless Bio Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
7/21/2026Kevin TangMajor ShareholderBuy2,975$2.44$7,259.002,858,935View SEC Filing Icon  
7/20/2026Kevin TangMajor ShareholderBuy1,623$2.44$3,960.122,855,960View SEC Filing Icon  
7/17/2026Kevin TangMajor ShareholderBuy265$2.44$646.602,854,337View SEC Filing Icon  
7/13/2026Kevin TangMajor ShareholderBuy48,211$2.42$116,670.622,790,103View SEC Filing Icon  
7/10/2026Kevin TangMajor ShareholderBuy43,367$2.43$105,381.812,741,892View SEC Filing Icon  
7/9/2026Kevin TangMajor ShareholderBuy7$2.48$17.362,698,525View SEC Filing Icon  
7/8/2026Kevin TangMajor ShareholderBuy14,338$2.46$35,271.482,698,518View SEC Filing Icon  
7/7/2026Kevin TangMajor ShareholderBuy15,810$2.48$39,208.802,684,180View SEC Filing Icon  
7/6/2026Kevin TangMajor ShareholderBuy27,062$2.49$67,384.382,668,370View SEC Filing Icon  
7/2/2026Kevin TangMajor ShareholderBuy9,821$2.49$24,454.292,641,308View SEC Filing Icon  
7/1/2026Keith CrandellMajor ShareholderSell16,000$2.49$39,840.00View SEC Filing Icon  
7/1/2026Kevin TangMajor ShareholderBuy71,612$2.49$178,313.882,631,487View SEC Filing Icon  
7/1/2026Venture Fund Ix L.P. ArchMajor ShareholderSell16,000$2.49$39,840.00View SEC Filing Icon  
6/30/2026Kevin TangMajor ShareholderBuy26,030$2.54$66,116.202,559,875View SEC Filing Icon  
4/2/2024Kristina BurowDirectorBuy200,000$16.00$3,200,000.001,181,766View SEC Filing Icon  
4/2/2024Ra Capital Management, L.P.Major ShareholderBuy312,500$16.00$5,000,000.001,884,787View SEC Filing Icon  
See Full Table

SEC Filings (Institutional Ownership Changes) for Boundless Bio (NASDAQ:BOLD)

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at BOLD by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Boundless Bio Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
8/15/2026ARCH Venture Management LLC2,694,095$6.74B0.6%N/A11.842%Search for SEC Filing on Google Icon
8/14/2026ADAR1 Capital Management LLC1,968,216$4.92M0.2%N/A8.651%Search for SEC Filing on Google Icon
8/7/2026BlackRock Inc.88,495$0.22M0.0%N/A0.394%Search for SEC Filing on Google Icon
8/6/2026GSA Capital Partners LLP72,353$0.18M0.0%N/A0.322%Search for SEC Filing on Google Icon
5/14/2026Renaissance Technologies LLC399,000$0.44M0.0%+16.9%1.776%Search for SEC Filing on Google Icon
2/18/2026XTX Topco Ltd39,577$47K0.0%+36.1%0.177%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC135,410$0.16M0.0%-17.5%0.605%Search for SEC Filing on Google Icon
2/16/2026Landscape Capital Management L.L.C.127,626$0.15M0.0%N/A0.570%Search for SEC Filing on Google Icon
2/12/2026Renaissance Technologies LLC341,400$0.41M0.0%+52.7%1.525%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC164,091$0.20M0.0%-23.2%0.733%Search for SEC Filing on Google Icon
11/17/2025Citadel Advisors LLC876,412$1.08M0.0%+5.5%3.914%Search for SEC Filing on Google Icon
11/17/2025Almitas Capital LLC86,808$0.11M0.0%-63.1%0.388%Search for SEC Filing on Google Icon
11/14/2025Squarepoint Ops LLC50,771$62K0.0%+175.9%0.227%Search for SEC Filing on Google Icon
8/15/2025Bridgeway Capital Management LLC50,500$51K0.0%N/A0.226%Search for SEC Filing on Google Icon
8/14/2025Redmile Group LLC589,034$0.60M0.1%-18.8%2.631%Search for SEC Filing on Google Icon
8/14/2025RBF Capital LLC200,000$0.20M0.0%N/A0.893%Search for SEC Filing on Google Icon
8/13/2025Stonepine Capital Management LLC106,175$0.11M0.1%N/A0.474%Search for SEC Filing on Google Icon
8/12/2025XTX Topco Ltd40,064$40K0.0%+54.6%0.179%Search for SEC Filing on Google Icon
8/8/2025Geode Capital Management LLC58,903$59K0.0%-76.2%0.263%Search for SEC Filing on Google Icon
8/1/2025Y Intercept Hong Kong Ltd55,242$56K0.0%N/A0.247%Search for SEC Filing on Google Icon
6/27/2025Goldman Sachs Group Inc.34,427$52K0.0%-29.3%0.154%Search for SEC Filing on Google Icon
5/12/2025Nuveen LLC3,958,413$5.98M0.0%N/A17.751%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Boundless Bio logo
Boundless Bio Inc is a clinical-stage oncology company. The company is dedicated to unlocking a new paradigm in cancer therapeutics that addresses the unmet need in patients with oncogene-amplified tumors by targeting extrachromosomal DNA (ecDNA), a root cause of oncogene amplification observed in cancer patients. Its ecDTx, BBI-355, is a novel, oral, selective inhibitor of checkpoint kinase 1 (CHK1), which manages ecDNA replication and transcription in cancer cells.
Read More on Boundless Bio

Today's Range

Now: $2.83
Low: $2.74
High: $2.84

50 Day Range

MA: $2.31
Low: $1.38
High: $2.89

52 Week Range

Now: $2.83
Low: $0.96
High: $2.97

Volume

108,951 shs

Average Volume

264,993 shs

Market Capitalization

$64.38 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

N/A

Who are the company insiders with the largest holdings of Boundless Bio?

Boundless Bio's top insider shareholders include:
  1. Kevin Tang (Major Shareholder)
  2. Ra Capital Management, LP (Major Shareholder)
  3. Kristina Burow (Director)
  4. Louis G Lange (Director)
  5. Matthew R Patterson (CEO)
  6. Suyash Prasad (VP)
  7. Mary Newman (SVP)
  8. David Nagler (SVP)
  9. John T Gray (SVP)
  10. 5Am Partners Iii, Llc (Insider)
Learn More about top insider investors at Boundless Bio.

Who are the major institutional investors of Boundless Bio?

Boundless Bio's top institutional investors include:
  1. ARCH Venture Management LLC — 11.84%
  2. ADAR1 Capital Management LLC — 8.65%
  3. BlackRock Inc. — 0.39%
  4. GSA Capital Partners LLP — 0.32%
Learn More about top institutional investors of Boundless Bio stock.

Which major investors are buying Boundless Bio stock?

During the last quarter, BOLD stock was bought by institutional investors including:
  1. ARCH Venture Management LLC
  2. ADAR1 Capital Management LLC
  3. BlackRock Inc.
  4. GSA Capital Partners LLP