Boundless Bio, Inc. (BOLD) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-07-13

Boundless Bio, Inc. (BOLD) has filed 10 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-13. 8 Form 8-K material event filings were reported by BOLD in the last 90 days. InsiderAlpha tracks every BOLD SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Boundless Bio, Inc. (BOLD)

SEC CIK0001782303

90-Day SEC Filing Activity

Form 4 filings (90d)10
Form 8-K filings (90d)8
Latest Form 4 filing2026-07-13

Recent BOLD Insider Transactions (Form 4)

DateInsiderRoleTransactionSharesPriceValueFiling
TANG KEVINInsiderP — Open-market purchase48.2K$2.42$117KSEC
TANG KEVINInsiderP — Open-market purchase43.4K$2.43$105KSEC
TANG KEVINInsiderP — Open-market purchase7$2.48$17SEC
TANG KEVINInsiderP — Open-market purchase14.3K$2.46$35KSEC
TANG KEVINInsiderP — Open-market purchase15.8K$2.48$39KSEC
TANG KEVINInsiderP — Open-market purchase27.1K$2.49$67KSEC
TANG KEVINInsiderP — Open-market purchase9.8K$2.49$24KSEC
CRANDELL KEITH10% OwnerM — Option exercise16.0K$1.03$16KSEC
TANG KEVINInsiderP — Open-market purchase71.6K$2.49$178KSEC
CRANDELL KEITH10% OwnerS — Open-market sale16.0K$2.49$40KSEC
ARCH Venture Fund IX, L.P.10% OwnerM — Option exercise16.0K$1.03$16KSEC
ARCH Venture Fund IX, L.P.10% OwnerS — Open-market sale16.0K$2.49$40KSEC
TANG KEVINInsiderP — Open-market purchase100$2.50$250SEC
TANG KEVINInsiderP — Open-market purchase25.9K$2.54$66KSEC
TANG KEVINInsiderP — Open-market purchase64.0K$2.47$158KSEC

All transactions sourced from SEC EDGAR Form 4 filings for Boundless Bio, Inc. (BOLD). Updated in real time as new filings are submitted to the SEC.

Most-Active BOLD Insiders — Last 90 Days

InsiderForm 4 filingsTotal transaction value
TANG KEVIN16$1.35M
CRANDELL KEITH3$56K
ARCH Venture Fund IX, L.P.3$56K
Lim Jonathan E1—
Whiting Nancy1—

Recent BOLD Form 8-K Material Events

Recent Insider Filings

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in BOLD insider filings:

POpen-market purchase by the insider
SOpen-market sale by the insider
AGrant, award, or other acquisition from the issuer
MExercise or conversion of derivative security (e.g. options)
FPayment of exercise price or tax liability via share withholding
GBona-fide gift of securities
DDisposition to the issuer (e.g. share buyback participation)
JOther acquisition or disposition
XExercise of in-the-money or at-the-money derivative security
CConversion of derivative security
VTransaction voluntarily reported earlier than required

BOLD Insider Trading — FAQ

What is the latest insider trade for BOLD?
Boundless Bio, Inc. (BOLD) had 10 insider filings in the last 90 days, with the most recent on 2026-07-13. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying BOLD stock?
0 insider purchases of BOLD were filed in the last 90 days.
How many insiders are selling BOLD stock?
0 insider sales of BOLD were filed in the last 90 days.
Where can I see BOLD SEC filings (Form 4, 10-K, 10-Q, 8-K)?
InsiderAlpha aggregates every BOLD SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

Learn More

Open the live BOLD dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.