MKS INC (MKSI) — Institutional Holders, Q2 2026

809 institutional investment managers reported a MKSI position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $35.0B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← MKSI stock profile

MKSI in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

211

Added to

243

Trimmed

276

Sold out

Biggest buyers

ALKEON CAPITAL MANAGEMENTNew · +1,072,040 sh+$476.8M
Sachem Head Capital ManagementNew · +812,700 sh+$361.5M
Qube Research & Technologies LtdAdded · +531,708 sh+$236.5M
TOMS Capital Investment ManagementNew · +293,000 sh+$130.3M
Aspex Management (HK) LtdAdded · +281,652 sh+$125.3M

Biggest sellers

WELLINGTON MANAGEMENT GROUP LLPTrimmed · -846,103 sh-$376.3M
Contour Asset ManagementSold out · -374,868 sh-$166.7M
DIMENSIONAL FUND ADVISORSTrimmed · -302,200 sh-$134.4M
AMERICAN CENTURY COMPANIESTrimmed · -275,398 sh-$122.5M
VICTORY CAPITAL MANAGEMENTTrimmed · -269,731 sh-$120.0M

MKSI 13F holders ranked 1–100 of 809

Institutional investors reporting a position in MKS INC on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	BlackRock#1 · 41,134,030 sh	41,134,030	$3.2B	0.05%	+39.7%
2	Invesco Ltd.#2 · 8,161,664 sh	8,161,664	$2.1B	0.16%	-83.6%
3	VANGUARD PORTFOLIO MANAGEMENT#3 · 3,707,327 sh	3,707,327	$1.6B	0.07%	+0.6%
4	JPMORGAN CHASE#4 · 17,933,844 sh	17,933,844	$1.4B	0.08%	-58.0%
5	VANGUARD CAPITAL MANAGEMENT#5 · 3,049,560 sh	3,049,560	$1.4B	0.03%	+1.2%
6	STATE STREET#6 · 38,656,663 sh	38,656,663	$1.1B	0.03%	+21.8%
7	Point72 Asset Management, L.P.#7 · 1,996,843 sh	1,996,843	$888.2M	0.98%	-82.8%
8	Capital International Investors#8 · 1,915,187 sh	1,915,187	$851.9M	0.18%	-2.7%
9	PRICE T ROWE ASSOCIATES#9 · 1,889,901 sh	1,889,901	$840.6M	0.08%	+11.2%
10	Aspex Management (HK) Ltd#10 · 1,820,441 sh	1,820,441	$809.7M	9.11%	+18.3%
11	FMR#11 · 45,527,498 sh	45,527,498	$796.6M	0.03%	-8.6%
12	GEODE CAPITAL MANAGEMENT#12 · 1,539,072 sh	1,539,072	$686.6M	0.04%	0.0%
13	WELLINGTON MANAGEMENT GROUP LLP#13 · 2,040,034 sh	2,040,034	$631.7M	0.11%	-29.3%
14	Capital World Investors#14 · 1,366,290 sh	1,366,290	$607.7M	0.07%	+7.0%
15	LINDEN ADVISORS#15 · 201,344,000 sh	201,344,000	$593.3M	3.07%	+1.2%
16	Whale Rock Capital Management#16 · 1,271,373 sh	1,271,373	$565.5M	4.54%	-2.7%
17	Neuberger Berman Group#17 · 1,165,068 sh	1,165,068	$518.2M	0.34%	-18.7%
18	Sculptor Capital#18 · 162,500,000 sh	162,500,000	$479.7M	3.91%	+48.4%
19	ALKEON CAPITAL MANAGEMENT#19 · 1,072,040 sh	1,072,040	$476.8M	0.64%	New
20	NORGES BANK#20 · 954,667 sh	954,667	$424.6M	0.04%	—
21	WESTFIELD CAPITAL MANAGEMENT#21 · 928,617 sh	928,617	$413.0M	1.35%	-11.3%
22	Sachem Head Capital Management#22 · 812,700 sh	812,700	$361.5M	7.50%	New
23	CHARLES SCHWAB INVESTMENT MANAGEMENT#23 · 808,198 sh	808,198	$359.5M	0.05%	-6.7%
24	MILLENNIUM MANAGEMENT#24 · 16,201,071 sh	16,201,071	$332.8M	0.12%	+1711.5%
25	MORGAN STANLEY#25 · 9,993,576 sh	9,993,576	$330.6M	0.02%	+73.6%
26	VOYA INVESTMENT MANAGEMENT#26 · 108,898,131 sh	108,898,131	$329.0M	0.28%	-44.4%
27	CITADEL ADVISORS#27 · 697,670 sh	697,670	$310.3M	0.04%	-26.3%
28	Bank of New York Mellon#28 · 1,158,544 sh	1,158,544	$294.4M	0.05%	-13.0%
29	AQR CAPITAL MANAGEMENT#29 · 638,333 sh	638,333	$280.2M	0.10%	+3.5%
30	VICTORY CAPITAL MANAGEMENT#30 · 609,027 sh	609,027	$270.9M	0.15%	-30.7%
31	Qube Research & Technologies Ltd#31 · 606,068 sh	606,068	$269.6M	0.25%	+715.0%
32	FengHe Fund Management Pte. Ltd.#32 · 581,687 sh	581,687	$258.7M	24.54%	+27.5%
33	NORTHERN#33 · 577,866 sh	577,866	$257.0M	0.03%	+1.5%
34	DIMENSIONAL FUND ADVISORS#34 · 533,145 sh	533,145	$237.0M	0.04%	-36.2%
35	BANK OF AMERICA#35 · 520,847 sh	520,847	$231.7M	0.01%	-91.7%
36	PRINCIPAL FINANCIAL GROUP#36 · 474,686 sh	474,686	$211.1M	0.10%	-22.7%
37	FRANKLIN RESOURCES#37 · 57,757,742 sh	57,757,742	$208.1M	0.05%	-2.3%
38	VANGUARD FIDUCIARY#38 · 428,157 sh	428,157	$190.4M	0.04%	+2.6%
39	GOLDMAN SACHS GROUP#39 · 1,584,721 sh	1,584,721	$164.5M	0.01%	-78.0%
40	Nuveen#40 · 361,411 sh	361,411	$160.8M	0.04%	-96.5%
41	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#41 · 23,407,760 sh	23,407,760	$160.7M	0.03%	New
42	Calamos Advisors#42 · 50,767,000 sh	50,767,000	$149.9M	0.50%	-35.1%
43	MANUFACTURERS LIFE INSURANCE COMPANY, THE#43 · 10,565,549 sh	10,565,549	$148.5M	0.12%	-0.3%
44	Alberta Investment Management#44 · 50,000,000 sh	50,000,000	$147.6M	0.83%	+81.8%
45	DAVIDSON KEMPNER CAPITAL MANAGEMENT#45 · 49,500,000 sh	49,500,000	$145.7M	1.73%	+76.8%
46	RAYMOND JAMES FINANCIAL#46 · 327,432 sh	327,432	$145.6M	0.04%	-3.1%
47	BNP PARIBAS FINANCIAL MARKETS#47 · 40,363,304 sh	40,363,304	$145.0M	0.05%	-30.8%
48	UBS Group AG#48 · 578,728 sh	578,728	$143.9M	0.02%	-17.2%
49	SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT#49 · 319,833 sh	319,833	$142.3M	2.50%	+13.3%
50	Madison Asset Management#50 · 316,694 sh	316,694	$140.9M	1.68%	-6.4%
51	TREMBLANT CAPITAL GROUP#51 · 295,385 sh	295,385	$131.4M	3.77%	-10.4%
52	TOMS Capital Investment Management#52 · 293,000 sh	293,000	$130.3M	2.79%	New
53	TimesSquare Capital Management#53 · 288,450 sh	288,450	$128.3M	1.89%	+0.1%
54	SAMLYN CAPITAL#54 · 281,893 sh	281,893	$125.4M	2.04%	-43.2%
55	Amundi#55 · 4,241,670 sh	4,241,670	$119.3M	0.03%	-0.3%
56	ROYCE & ASSOCIATES#56 · 261,567 sh	261,567	$116.3M	0.94%	-35.2%
57	Polar Capital Plc#57 · 260,442 sh	260,442	$115.8M	0.27%	+260.7%
58	BALYASNY ASSET MANAGEMENT L.P.#58 · 260,178 sh	260,178	$115.7M	0.14%	-36.1%
59	NATIXIS ADVISORS#59 · 260,170 sh	260,170	$115.7M	0.13%	+12.1%
60	SG Americas Securities#60 · 348,038 sh	348,038	$114.8M	0.06%	+60.0%
61	Jain Global#61 · 38,781,000 sh	38,781,000	$114.3M	0.45%	+670.3%
62	MACKAY SHIELDS#62 · 36,470,000 sh	36,470,000	$107.5M	—	-0.1%
63	NORDEA INVESTMENT MANAGEMENT AB#63 · 232,107 sh	232,107	$102.5M	0.08%	-28.9%
64	MARSHALL WACE, LLP#64 · 225,115 sh	225,115	$100.1M	0.08%	+128.1%
65	WELLS FARGO & COMPANY#65 · 1,348,565 sh	1,348,565	$99.7M	0.02%	-2.4%
66	Quantinno Capital Management#66 · 223,165 sh	223,165	$99.3M	0.12%	-14.1%
67	JONES FINANCIAL COMPANIES LLLP#67 · 250,579 sh	250,579	$97.4M	0.04%	+12.0%
68	THRIVENT FINANCIAL FOR LUTHERANS#68 · 15,440,938 sh	15,440,938	$95.8M	0.16%	-26.6%
69	Penserra Capital Management#69 · 210,802 sh	210,802	$93.8M	0.72%	-15.9%
70	DeepCurrents Investment Group#70 · 31,035,000 sh	31,035,000	$91.6M	2.77%	+14.8%
71	Defiance ETFs#71 · 210,440 sh	210,440	$86.5M	1.17%	-16.0%
72	SYSTEMATIC FINANCIAL MANAGEMENT#72 · 192,042 sh	192,042	$85.4M	1.70%	-20.7%
73	RHUMBLINE ADVISERS#73 · 179,890 sh	179,890	$80.0M	0.06%	0.0%
74	NORTHWESTERN MUTUAL WEALTH MANAGEMENT#74 · 173,207 sh	173,207	$77.0M	0.04%	New
75	BANK OF MONTREAL#75 · 25,117,782 sh	25,117,782	$76.4M	0.03%	0.0%
76	Gotham Asset Management#76 · 170,226 sh	170,226	$75.7M	0.18%	-12.9%
77	D. E. Shaw#77 · 24,764,325 sh	24,764,325	$74.9M	0.04%	+1213.6%
78	LORD, ABBETT#78 · 12,051,098 sh	12,051,098	$74.0M	0.21%	-11.8%
79	COOKE & BIELER#79 · 165,227 sh	165,227	$73.5M	—	-21.3%
80	Handelsbanken Fonder AB#80 · 164,490 sh	164,490	$73.2M	0.21%	-14.6%
81	Evergreen Quality Fund GP, Ltd.#81 · 164,200 sh	164,200	$73.0M	1.18%	New
82	VALUE MANAGEMENT#82 · 159,452 sh	159,452	$70.9M	11.85%	-34.9%
83	LOOMIS SAYLES & L P#83 · 158,927 sh	158,927	$70.7M	0.09%	-7.7%
84	FIRST ADVISORS#84 · 157,249 sh	157,249	$69.9M	0.04%	+202.1%
85	LPL Financial#85 · 156,987 sh	156,987	$69.8M	0.02%	-10.3%
86	FEDERATED HERMES#86 · 149,659 sh	149,659	$66.6M	0.10%	+49.5%
87	Blue Grotto Capital#87 · 149,422 sh	149,422	$66.5M	5.55%	-60.2%
88	TENOR CAPITAL MANAGEMENT , L.P.#88 · 22,500,000 sh	22,500,000	$66.3M	0.93%	-27.3%
89	BANK OF NOVA SCOTIA#89 · 12,358,834 sh	12,358,834	$65.4M	0.10%	+33.1%
90	Retirement Systems of Alabama#90 · 145,960 sh	145,960	$64.9M	0.20%	-7.9%
91	TWO SIGMA INVESTMENTS#91 · 143,365 sh	143,365	$63.8M	0.05%	-48.6%
92	ALLIANCEBERNSTEIN L.P.#92 · 275,713 sh	275,713	$63.4M	0.02%	-13.8%
93	Artemis Investment Management LLP#93 · 141,986 sh	141,986	$63.2M	—	New
94	Harvey Partners#94 · 141,066 sh	141,066	$62.7M	4.30%	-42.0%
95	Park West Asset Management#95 · 138,740 sh	138,740	$61.7M	4.20%	-44.3%
96	Swiss National Bank#96 · 136,400 sh	136,400	$60.7M	0.03%	+2.6%
97	Rockefeller Capital Management L.P.#97 · 135,386 sh	135,386	$60.2M	0.09%	New
98	TORONTO DOMINION BANK#98 · 134,904 sh	134,904	$60.0M	0.07%	+248.7%
99	SummitTX Capital, L.P.#99 · 132,009 sh	132,009	$58.7M	1.51%	-18.0%
100	CRAMER ROSENTHAL MCGLYNN#100 · 131,194 sh	131,194	$58.4M	2.95%	-11.6%

Funds that sold out of MKSI in Q2 2026 (56)

Held MKSI at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held MKSI in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
Contour Asset Management374,868 sh	374,868	$86.1M
ZAZOVE ASSOCIATES41,180,000 sh	41,180,000	$52.7M
Polaris Capital Management134,700 sh	134,700	$31.0M
Rivermont Capital Management87,537 sh	87,537	$20.1M
TUDOR INVESTMENT ET AL81,280 sh	81,280	$18.7M
HEALTHCARE OF ONTARIO PENSION PLAN FUND10,500,000 sh	10,500,000	$17.4M
Ovata Capital Management Ltd10,000,000 sh	10,000,000	$16.6M
Tairen Capital Ltd68,500 sh	68,500	$15.7M
SEB Asset Management AB52,000 sh	52,000	$12.0M
Shellback Capital41,216 sh	41,216	$9.5M
Tyro Capital Management36,855 sh	36,855	$8.5M
GLAZER CAPITAL2,000,000 sh	2,000,000	$3.3M
FORA Capital10,039 sh	10,039	$2.3M
MOORE CAPITAL MANAGEMENT10,000 sh	10,000	$2.3M
Headlands Technologies9,325 sh	9,325	$2.1M
Timothy G. Youngquist 2020 Irrevocable8,752 sh	8,752	$2.0M
Havemeyer Place8,220 sh	8,220	$1.9M
Aquatic Capital Management8,014 sh	8,014	$1.8M
EQUITABLE7,224 sh	7,224	$1.7M
Dorsey Wright & Associates5,784 sh	5,784	$1.3M
SIERRA SUMMIT ADVISORS4,879 sh	4,879	$1.1M
Quinn Opportunity Partners4,410 sh	4,410	$1.0M
Verition Fund Management3,670 sh	3,670	$843.4K
AIGEN INVESTMENT MANAGEMENT3,479 sh	3,479	$799.5K
EntryPoint Capital3,289 sh	3,289	$755.8K
Quantitative Investment Management3,015 sh	3,015	$692.0K
Shay Capital2,625 sh	2,625	$603.3K
FIDEURAM - INTESA SANPAOLO PRIVATE BANKING S.P.A.2,624 sh	2,624	$603.0K
GABELLI & INVESTMENT ADVISERS2,220 sh	2,220	$510.2K
Centiva Capital1,939 sh	1,939	$445.6K
Virtu Financial1,865 sh	1,865	$428.0K
Watershed Asset Management, L.L.C.1,827 sh	1,827	$419.9K
EARNED WEALTH ADVISORS1,385 sh	1,385	$318.3K
Farringdon Capital, Ltd.1,280 sh	1,280	$294.2K
EVOLVE PRIVATE WEALTH931 sh	931	$214.0K
Absolute Gestao de Investimentos Ltda.890 sh	890	$204.5K
CHILDRESS CAPITAL ADVISORS872 sh	872	$200.4K
ABN AMRO INVESTMENT SOLUTIONS100,000 sh	100,000	$165.9K
Bayforest Capital Ltd501 sh	501	$115.1K
Root Financial Partners273 sh	273	$62.7K
TWIN PEAKS WEALTH ADVISORS238 sh	238	$54.7K
Balboa Wealth Partners16,000 sh	16,000	$25.8K
Wall Street Financial Group73 sh	73	$16.8K
Advisory Services Network63 sh	63	$14.5K
Matrix61 sh	61	$14.0K
Bravera Wealth50 sh	50	$11.5K
Joseph Group Capital Management41 sh	41	$9.4K
Wealth Preservation Advisors39 sh	39	$9.0K
IFM Investors Pty Ltd10 sh	10	$2.3K
Sound Income Strategies9 sh	9	$2.1K
MCF Advisors6 sh	6	$1.4K
Vermillion Wealth Management6 sh	6	$1.4K
ATWOOD & PALMER5 sh	5	$1.1K
CURIO WEALTH2 sh	2	$460.00
TopTier Wealth Management1 sh	1	$230.00
Elequin Securities78 sh	78	—

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.