SCHEDULE 13G Filed 2026-08-14 Event — SEC 0001104659-26-097418 →

ADAR1 Capital Management, LLC → Boundless Bio, Inc. BOLD

Stake: — Shares: — Class: Common Stock, par value $0.0001 per share

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

14 transactions

14 buys · 0 sales · 0 awards/exercises

Issuer Cluster

2 13D/G filings on this issuer

1 other filing besides this one

Filer Track Record

11 filings by this filer

10 other filings in the data moat

Short Interest · settle 2026-07-31

DTC 1.52

223,819 shares short · -6.9% vs prior

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-07-13	TANG KEVIN	10%+ owner	Buy	48,211	$2.42	$117K
2026-07-10	TANG KEVIN	10%+ owner	Buy	43,367	$2.43	$105K
2026-07-09	TANG KEVIN	10%+ owner	Buy	7	$2.48	$17
2026-07-02	TANG KEVIN	10%+ owner	Buy	9,821	$2.49	$24K
2026-07-01	TANG KEVIN	10%+ owner	Buy	71,612	$2.49	$178K
2026-06-30	TANG KEVIN	10%+ owner	Buy	25,930	$2.54	$66K
2026-06-30	TANG KEVIN	10%+ owner	Buy	100	$2.50	$250
2026-06-29	TANG KEVIN	10%+ owner	Buy	63,985	$2.47	$158K
2026-06-29	TANG KEVIN	10%+ owner	Buy	777	$2.48	$2K
2026-06-26	TANG KEVIN	10%+ owner	Buy	75,047	$2.55	$191K
2026-06-26	TANG KEVIN	10%+ owner	Buy	134	$2.54	$340
2026-06-25	TANG KEVIN	10%+ owner	Buy	145,880	$2.48	$362K
2026-06-25	TANG KEVIN	10%+ owner	Buy	510	$2.56	$1K
2026-06-15	Whiting Nancy	director	Award	32,000	$1.40	$45K

Other 13D/G Filings on Boundless Bio, Inc.

Filed	Form	Filer	Stake	Shares
2026-06-29	SCHEDULE 13G	TANG CAPITAL MANAGEMENT LLC	—	—	view →

Other Filings by ADAR1 Capital Management, LLC

Filed	Form	Issuer	Stake	Shares
2026-08-14	SCHEDULE 13G	Rein Therapeutics, Inc.	—	—	view →
2026-08-14	SCHEDULE 13G	Cyclerion Therapeutics, Inc.	—	—	view →
2026-08-14	SCHEDULE 13G	Pliant Therapeutics, Inc.	—	—	view →
2026-08-14	SCHEDULE 13G	Research Alliance Corporation III	—	—	view →
2026-08-14	SCHEDULE 13G	Editas Medicine, Inc.	—	—	view →
2026-08-14	SCHEDULE 13G	JATT II Acquisition Corp.	—	—	view →
2026-08-14	SCHEDULE 13G	Amanat Acquisition Corp.	—	—	view →
2026-06-05	SCHEDULE 13G	Rallybio Corporation RLYB	—	—	view →
2026-06-05	SCHEDULE 13G	InMed Pharmaceuticals, Inc. INM	—	—	view →
2025-04-28	SCHEDULE	Keros Therapeutics, Inc. KROS	13.29%	5,390,964	view →

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