Boundless Bio, Inc.

SEC insider activity covers quarterly filings through June 30, 2026. Later filings are not included. Reported roles do not establish current employment or current holdings. SEC filing documents, sections and filing-text search cover filings dated January 1, 2000 onward. Earlier filings are deferred until after launch.

BOLD

organization

SIC: 2834

SEC Insider

$15.3M

149 transactions

Summary

Boundless Bio, Inc. (BOLD) is an organization.

Recent Insider Transactions

As filed, including amendments; not net cash flow or current holdings. Joint reports count once. Totals cover known values only.

Buys: $15.3MSales: —34 insiders

Date	Insider	Type	Value
2026-06-25	Joint reporting: TANG KEVIN; TANG CAPITAL MANAGEMENT LLC	Buy	$362K
2026-06-26	Joint reporting: TANG KEVIN; TANG CAPITAL MANAGEMENT LLC	Buy	$191K
2026-06-29	Joint reporting: TANG KEVIN; TANG CAPITAL MANAGEMENT LLC	Buy	$158K
2026-06-29	Joint reporting: TANG KEVIN; TANG CAPITAL MANAGEMENT LLC	Buy	$2K
2026-06-25	Joint reporting: TANG KEVIN; TANG CAPITAL MANAGEMENT LLC	Buy	$1K
2026-06-26	Joint reporting: TANG KEVIN; TANG CAPITAL MANAGEMENT LLC	Buy	$340.36
2026-06-15	Lew Jennifer	A	$0
2026-06-15	Christensen James	A	$0
2026-06-15	Lim Jonathan E	A	$0
2026-06-15	Whiting Nancy	A	$0
2026-01-23	HINKLE DAVID A(See Remarks)	A	$0
2026-01-23	Hornby Zachary(President & CEO)	A	$0
2026-01-23	Doebele Robert(Chief Medical Officer)	A	$0
2026-01-23	Hassig Christian(Chief Scientific Officer)	A	$0
2026-01-23	Oien Jessica(See Remarks)	A	$0
2025-06-23	Whiting Nancy	A	$0
2025-06-23	Burow Kristina	A	$0
2025-06-23	Lim Jonathan E	A	$0
2025-06-23	Lew Jennifer	A	$0
2025-06-23	Christensen James	A	$0

SEC filings: SEC EDGAR

Activity data: SEC EDGAR

Boundless Bio, Inc. — Contributions, Lobbying & Contracts | Poliscope