MASSACHUSETTS FINANCIAL SERVICES CO /MA/

Position in CYTK — Cytokinetics Inc

CIK 912938 Boston, MA

Position in CYTK

as of Jun 30, 2026 · filed Aug 3, 2026 Compact

Position Value

$46,798,956

+$26,258,171 QoQ

Shares Held

549,348

+76.3% QoQ

Ownership

0.395%

of shares outstanding

% of Portfolio

0.02%

of 13F equity value

Holder Rank

#55

of 477 holders

Holding Since

Jun 2024

9 quarters on record

Voting authority Sole 99% Shared 1% None 0%

Healthcare · as of Jun 30, 2026

MASSACHUSETTS FINANCIAL SERVICES CO /MA/ holds $2,249,676,327 across 65 Biotechnology names. CYTK ranks #11 (2.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ASND	Ascendis Pharma A/S	1,875,301	$500,180,281
2	RVMD	Revolution Medicines, Inc.	2,012,317	$376,866,725
3	VRTX	Vertex Pharmaceuticals Inc / Ma	423,049	$210,141,127
4	TECH	BIO-TECHNE Corp	2,746,462	$194,037,538
5	SRRK	Scholar Rock Holding Corp	2,607,348	$143,404,140
6	LGND	Ligand Pharmaceuticals Inc	375,762	$118,774,610
7	ALNY	Alnylam Pharmaceuticals, Inc.	350,560	$105,529,075
8	BNTX	BioNTech SE	677,708	$63,060,728

9 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$46,798,956	549,348	+76.3%	Shares	Defined	2026-08-03
2026-03-31	$20,540,785	311,649	-4.8%	Shares	Sole	2026-05-14
2025-12-31	$20,790,414	327,202	-34.1%	Shares	Sole	2026-01-22
2025-09-30	$27,297,147	496,673	-0.2%	Shares	Sole	2025-10-29
2025-06-30	$16,440,770	497,602	+55.7%	Shares	Sole	2025-08-08
2025-03-31	$12,842,031	319,533	+0.1%	Shares	Sole	2025-05-02
2024-12-31	$15,018,978	319,281	-7.3%	Shares	Sole	2025-02-12
2024-09-30	$18,186,854	344,448	+24.8%	Shares	Sole	2024-11-12
2024-06-30	$14,957,310	276,067	—	Shares	Sole	2024-08-09
No filing history on record for this holder in this stock.