Polaris Capital Management, LLC

CIK

1316926

City

BOSTON

State / Country

Stock

MKSI — Mks Inc

Top Portfolio Positions

82 positions · $1,214,570,138 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
BPOP	Popular, Inc. Financial Services	648,130	$86,959,602	7.16%
JAZZ	Jazz Pharmaceuticals plc Healthcare	415,366	$78,524,942	6.47%
LIN	Linde PLC Basic Materials	124,583	$61,763,268	5.09%
UTHR	UNITED THERAPEUTICS Corp Healthcare	96,650	$57,311,517	4.72%
SW	Smurfit Westrock plc Consumer Cyclical	1,366,550	$54,457,017	4.48%
LNTH	Lantheus Holdings, Inc. Healthcare	617,000	$46,799,450	3.85%
ARW	Arrow Electronics, Inc. Technology	286,603	$41,101,736	3.38%
MPC	Marathon Petroleum Corp Energy	155,832	$38,051,057	3.13%
CVS	CVS HEALTH Corp Healthcare	517,700	$37,181,214	3.06%
EMN	Eastman Chemical Co Basic Materials	471,600	$35,992,512	2.96%

25 quarters · across all stocks

24 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$30,955,407	134,700	-49.2%	Shares	Sole	2026-04-27
2025-12-31	$42,362,980	265,100	-33.9%	Shares	Sole	2026-01-29
2025-09-30	$49,668,901	401,300	+11.0%	Shares	Sole	2025-10-27
2025-06-30	$35,908,704	361,400	-3.3%	Shares	Sole	2025-07-21
2025-03-31	$29,944,040	373,600	+6.0%	Shares	Sole	2025-05-14
2024-12-31	$36,787,036	352,400	-0.5%	Shares	Sole	2025-01-29
2024-09-30	$38,483,340	354,000	-1.3%	Shares	Sole	2024-11-13
2024-06-30	$46,825,988	358,600	-2.2%	Shares	Sole	2024-07-26
2024-03-31	$48,771,100	366,700	-31.3%	Shares	Sole	2024-04-24
2023-12-31	$54,932,580	534,000	+15.8%	Shares	Sole	2024-02-07
2023-09-30	$39,920,902	461,300	-28.6%	Shares	Sole	2023-10-30
2023-06-30	$69,800,170	645,700	-0.8%	Shares	Sole	2023-07-31
2023-03-31	$57,673,896	650,800	+11.9%	Shares	Sole	2023-05-03
2022-12-31	$49,278,968	581,600	+5335.5%	Shares	Sole	2023-02-09
2022-09-30	$884,248	10,700	+28.9%	Shares	Sole	2022-11-10
2022-06-30	$851,829	8,300	+56.6%	Shares	Sole	2022-08-12
2022-03-31	$795,000	5,300	-37.6%	Shares	Sole	2022-05-11
2021-09-30	$1,282,735	8,500	0.0%	Shares	Sole	2021-11-09
2021-06-30	$1,512,575	8,500	0.0%	Shares	Sole	2021-08-10
2021-03-31	$1,576,070	8,500	-22.7%	Shares	Sole	2021-05-11
2020-12-31	$1,654,950	11,000	0.0%	Shares	Sole	2021-02-11
2020-09-30	$1,201,530	11,000	-12.7%	Shares	Sole	2020-11-12
2020-06-30	$1,426,824	12,600	-20.3%	Shares	Sole	2020-08-12
2020-03-31	$1,286,910	15,800	—	Shares	Sole	2020-05-15
No 13F history on record for this holder in this stock.