PRIMECAP MANAGEMENT CO/CA/

Position in GKOS — GLAUKOS Corp

CIK 763212 PASADENA, CA

Position in GKOS

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

Position Value

$362,881,810

-$18,407,130 QoQ

Shares Held

3,370,628

-0.2% QoQ

Ownership

5.74%

of shares outstanding

% of Portfolio

0.29%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 99.5781201603974.ToString("F0")% Shared 0.ToString("F0")% None 0.4218798396025904.ToString("F0")%

Healthcare · as of Mar 31, 2026

PRIMECAP MANAGEMENT CO/CA/ holds $3,621,368,766 across 15 Medical Devices names. GKOS ranks #2 (10.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	BSX	Boston Scientific Corp	32,529,774	$2,041,243,318
2	GKOS	GLAUKOS Corp This page	3,370,628	$362,881,810
3	ZBH	Zimmer Biomet Holdings, Inc.	3,907,150	$353,284,503
4	EW	Edwards Lifesciences Corp	3,422,791	$274,097,103
5	LIVN	LivaNova PLC	4,207,052	$267,400,225
6	SYK	Stryker Corp	526,672	$173,059,152
7	ABT	Abbott Laboratories	762,220	$78,257,127
8	BRKR	Bruker Corp	857,600	$30,976,512

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$362,881,810	3,370,628	-0.2%	Shares	Sole	2026-05-11
2025-12-31	$381,288,940	3,376,928	+49.8%	Shares	Sole	2026-02-11
2025-09-30	$183,796,411	2,253,788	+23.3%	Shares	Sole	2025-11-12
2025-06-30	$188,813,913	1,827,998	+50.0%	Shares	Sole	2025-08-11
2025-03-31	$119,922,309	1,218,475	+0.3%	Shares	Sole	2025-05-09
2024-12-31	$182,075,890	1,214,325	-2.5%	Shares	Sole	2025-02-10
2024-09-30	$162,222,701	1,245,185	+2.0%	Shares	Sole	2024-11-08
2024-06-30	$144,483,455	1,220,815	+43.9%	Shares	Sole	2024-08-09
2024-03-31	$80,017,794	848,635	+7.4%	Shares	Sole	2024-05-14
2023-12-31	$62,799,882	790,035	+23.7%	Shares	Sole	2024-02-09
2023-09-30	$48,056,155	638,620	+3.3%	Shares	Sole	2023-11-13
2023-06-30	$44,043,385	618,500	+1.7%	Shares	Sole	2023-08-11
2023-03-31	$30,470,820	608,200	+10.5%	Shares	Sole	2023-05-15
2022-12-31	$24,044,966	550,480	+2.3%	Shares	Sole	2023-02-13
2022-09-30	$28,637,263	537,890	-0.6%	Shares	Sole	2022-11-14
2022-06-30	$24,589,025	541,370	+1.7%	Shares	Sole	2022-08-11
2022-03-31	$30,789,150	532,500	-0.1%	Shares	Sole	2022-05-11
2021-12-31	$23,682,076	532,900	+6.5%	Shares	Sole	2022-02-11
2021-09-30	$24,094,634	500,200	+12.5%	Shares	Sole	2021-11-12
2021-06-30	$37,706,935	444,500	+1.9%	Shares	Sole	2021-08-10
2021-03-31	$36,618,659	436,300	+1.2%	Shares	Sole	2021-05-14
2020-12-31	$32,452,112	431,200	+5.8%	Shares	Sole	2021-02-08
2020-09-30	$20,189,304	407,700	+1.5%	Shares	Sole	2020-11-13
2020-06-30	$15,430,624	401,630	+18.2%	Shares	Sole	2020-08-13
2020-03-31	$10,483,142	339,700	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.