WELLINGTON MANAGEMENT GROUP LLP

Position in BOLD — Boundless Bio, Inc.

CIK 902219 Boston, MA

Position in BOLD

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$611,856

-$55,623 QoQ

Shares Held

556,233

0.0% QoQ

Ownership

2.48%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2024

9 quarters on record

Voting authority Sole 0% Shared 100% None 0%

Healthcare · as of Mar 31, 2026

WELLINGTON MANAGEMENT GROUP LLP holds $14,419,413,768 across 180 Biotechnology names. BOLD ranks #170 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	VRTX	Vertex Pharmaceuticals Inc / Ma	3,212,589	$1,434,549,489
2	REGN	Regeneron Pharmaceuticals, Inc.	1,837,459	$1,419,694,318
3	ARGX	Argenx SE	1,021,457	$745,918,971
4	ALNY	Alnylam Pharmaceuticals, Inc.	1,935,925	$640,539,501
5	RVMD	Revolution Medicines, Inc.	6,027,819	$586,205,394
6	CYTK	Cytokinetics Inc	8,009,489	$527,905,416
7	IONS	Ionis Pharmaceuticals Inc	6,391,816	$479,961,458
8	ASND	Ascendis Pharma A/S	1,757,633	$402,023,391

9 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$611,856	556,233	0.0%	Shares	Defined	2026-05-15
2025-12-31	$667,479	556,233	0.0%	Shares	Defined	2026-02-17
2025-09-30	$684,166	556,233	0.0%	Shares	Defined	2025-11-14
2025-06-30	$561,795	556,233	0.0%	Shares	Defined	2025-08-14
2025-03-31	$839,911	556,233	0.0%	Shares	Defined	2025-05-13
2024-12-31	$1,613,075	556,233	-41.3%	Shares	Defined	2025-02-12
2024-09-30	$3,288,212	947,612	-0.1%	Shares	Defined	2024-11-14
2024-06-30	$3,670,313	948,402	-19.1%	Shares	Defined	2024-08-14
2024-03-31	$16,700,614	1,171,973	—	Shares	Defined	2024-05-15
No filing history on record for this holder in this stock.