PRIMECAP MANAGEMENT CO/CA/

Position in WAT — Waters Corp /De/

CIK 763212 PASADENA, CA

Position in WAT

as of Mar 31, 2026 · filed May 11, 2026 Compact

Position Value

$11,568,636

-$3,262,586 QoQ

Shares Held

38,847

-0.5% QoQ

Ownership

0.040%

of shares outstanding

% of Portfolio

0.01%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2020

22 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

PRIMECAP MANAGEMENT CO/CA/ holds $1,916,024,145 across 9 Diagnostics & Research names. WAT ranks #8 (0.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	TMO	Thermo Fisher Scientific Inc.	1,982,531	$974,473,462
2	DHR	Danaher Corp /De/	1,556,970	$295,201,512
3	ILMN	Illumina, Inc.	2,067,299	$254,815,274
4	A	Agilent Technologies, Inc.	1,334,006	$152,050,003
5	GRAL	GRAIL, Inc.	1,843,772	$95,286,136
6	RVTY	Revvity, Inc.	867,030	$75,960,498
7	CRL	Charles River Laboratories International, Inc.	266,890	$46,038,525
8	WAT	Waters Corp /De/ This page	38,847	$11,568,636

22 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$11,568,636	38,847	-0.5%	Shares	Sole	2026-05-11
2025-12-31	$14,831,222	39,047	-19.6%	Shares	Sole	2026-02-11
2025-09-30	$14,560,872	48,567	-1.0%	Shares	Sole	2025-11-12
2025-06-30	$17,119,364	49,047	-28.8%	Shares	Sole	2025-08-11
2025-03-31	$25,394,841	68,901	-0.2%	Shares	Sole	2025-05-09
2024-12-31	$25,612,830	69,041	-29.9%	Shares	Sole	2025-02-10
2024-09-30	$35,434,409	98,459	-0.4%	Shares	Sole	2024-11-08
2024-06-30	$28,680,973	98,859	+7.3%	Shares	Sole	2024-08-09
2024-03-31	$31,723,892	92,159	-0.1%	Shares	Sole	2024-05-14
2023-12-31	$30,374,430	92,259	-5.5%	Shares	Sole	2024-02-09
2023-09-30	$26,779,074	97,659	+10.9%	Shares	Sole	2023-11-13
2023-06-30	$23,467,247	88,044	+13.1%	Shares	Sole	2023-08-11
2023-03-31	$24,102,837	77,844	+53.6%	Shares	Sole	2023-05-15
2022-12-31	$17,366,750	50,694	-1.0%	Shares	Sole	2023-02-13
2022-09-30	$13,798,318	51,194	-0.4%	Shares	Sole	2022-11-14
2022-06-30	$17,010,386	51,394	-0.4%	Shares	Sole	2022-08-11
2022-03-31	$16,014,261	51,594	+12.4%	Shares	Sole	2022-05-11
2021-12-31	$17,102,340	45,900	-0.6%	Shares	Sole	2022-02-11
2021-09-30	$16,507,260	46,200	+12.7%	Shares	Sole	2021-11-12
2021-06-30	$14,169,318	40,998	0.0%	Shares	Sole	2021-08-10
2021-03-31	$11,650,401	40,998	+8.5%	Shares	Sole	2021-05-14
2020-12-31	$9,351,238	37,795	—	Shares	Sole	2021-02-08
No filing history on record for this holder in this stock.