MKS Instruments

MKSI • NASDAQ

MKS Instruments is a hardware, equipment & parts company in the technology sector on NASDAQ, led by John T.C. Lee, with a market cap of $10.5B. As of Q3 2025, 107% of shares are held by 423 institutional investors, with VANGUARD GROUP INC as the largest holder at 11.54%.

Chief Executive OfficerJohn T.C. Lee

Market Cap$10.5B

Hardware, Equipment & Parts

Technology

Employees10.2K

Websitemksinst.com

Country

United States of America

Overview

Overview of institutional ownership in MKSI as of Q3 2025 with a market cap of $8.3B

All Institutions

Institutions: 423
Value Held: $8.9B
Shares Held: 72.0M
Avg Position: $21.1M
Median Position: $846.6K

Hedge Funds

Hedge Funds: 49
Value Held: $693.4M
Shares Held: 5.6M
Avg Position: $14.2M
Median Position: $4.2M

Ownership Breakdown

Institutional (non-HF)

98.79%

$8.2B

Hedge Funds

8.34%

$693.4M

Retail & Other

Based on market cap of $8.3B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in MKSI as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$959.5M 0.01% of portfolio	11.54% 7.8M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
B BlackRock, Inc. Institution	-	$757.9M 0.01% of portfolio	9.12% 6.1M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	Robert W Sharps President	$449.7M 0.05% of portfolio	5.41% 3.6M shares	≤ Q2 2013 Held for 12y 5m+	$912.31B
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	David Craig Brown CEO	$443.4M 0.28% of portfolio	5.33% 3.6M shares	Q3 2013 Held for 12y 2m	$158.22B
FMR LLC Institution	-	$426.2M 0.02% of portfolio	5.13% 3.4M shares	Q1 2018 Held for 7y 8m	$1.92T
C Capital International Investors Institution	-	$402.8M 0.07% of portfolio	4.85% 3.3M shares	Q1 2019 Held for 6y 8m	$615.90B
WELLINGTON MANAGEMENT CO LLP Long Only Manager	Jean Marie Hynes CEO	$373.0M 0.07% of portfolio	4.49% 3.0M shares	Q2 2014 Held for 11y 5m	$571.21B
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	$295.0M 0.05% of portfolio	3.55% 2.4M shares	≤ Q2 2013 Held for 12y 5m+	$633.08B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$253.0M 0.01% of portfolio	3.04% 2.0M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
N Neuberger Berman Group LLC Institution	-	$202.3M 0.15% of portfolio	2.43% 1.6M shares	Q3 2015 Held for 10y 2m	$136.94B

Net Capital Flow

Institutional buying and selling activity for MKSI in Q3 2025

Traded: −$174.2M
Buyers: 224
Sellers: 174
Total Bought: +$977.9M
Total Sold: −$1.2B
Avg Position: $19.4M

Biggest Buyers

Institution	Net Bought	Current Position
FRANKLIN RESOURCES INC Institution	+$139.9M +1.1M shares	$174.4M 1.4M shares
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy	+$125.4M +1.0M shares	$125.4M 1.0M shares
Invesco Ltd. ETF Provider	+$55.3M +446.8K shares	$295.0M 2.4M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$54.6M +441.4K shares	$55.2M 446.2K shares
N NOMURA HOLDINGS INC Institution	+$40.1M +324.2K shares	$52.8M 426.5K shares
WESTFIELD CAPITAL MANAGEMENT CO LP Long Only Manager	+$40.0M +323.4K shares	$40.0M 323.4K shares
M MANUFACTURERES LIFE INSURANCE CO Institution	+$37.2M +300.7K shares	$101.9M 823.2K shares
DIMENSIONAL FUND ADVISORS LP Long Only Manager	+$36.9M +297.9K shares	$156.6M 1.3M shares
VANGUARD GROUP INC Institution	+$36.6M +295.5K shares	$959.5M 7.8M shares
H HRT FINANCIAL LLC Institution	+$32.3M +260.6K shares	$33.0M 266.6K shares

Biggest Sellers

Institution	Net Sold	Current Position
B BlackRock, Inc. Institution	−$147.7M −1.2M shares	$757.9M 6.1M shares
R Rafferty Asset Management, LLC Institution	−$87.2M −878.1K shares	Sold Off 0 shares
BARCLAYS PLC Institution	−$86.6M −700.0K shares	$45.4M 367.1K shares
BANK OF AMERICA CORP /DE/ Institution	−$68.6M −554.6K shares	$53.0M 428.0K shares
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	−$61.4M −496.1K shares	$449.7M 3.6M shares
Madison Asset Management, LLC Long Only Manager	−$60.3M −487.6K shares	$120.8M 976.1K shares
UBS Group AG Institution	−$60.3M −487.3K shares	$80.9M 653.8K shares
FMR LLC Institution	−$47.8M −386.1K shares	$426.2M 3.4M shares
CITIGROUP INC Institution	−$47.1M −380.7K shares	$8.1M 65.8K shares
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	−$41.1M −413.8K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited MKSI in Q3 2025

New Positions: 27
New Value: $32.2M
Exited Positions: 37
Exited Value: $183.4M

New Positions

Institution	Position Value
D Delta Global Management LP Hedge Fund•Market Neutral	$18.8M 151.5K shares
Park West Asset Management LLC Hedge Fund•Multi-Strategy	$7.4M 60.0K shares
Optimize Financial Inc RIA/Wealth	$1.6M 13.2K shares
Aaron Wealth Advisors LLC RIA/Wealth	$554.5K 4.5K shares
V Vise Technologies, Inc. Institution	$517.7K 4.2K shares
T TECTONIC ADVISORS LLC RIA/Wealth	$374.9K 3.0K shares
Dynasty Wealth Management, LLC Fund of Funds	$334.1K 2.7K shares
NorthRock Partners, LLC RIA/Wealth	$327.9K 2.6K shares
SYON CAPITAL LLC RIA/Wealth	$305.3K 2.5K shares
Diametric Capital, LP Hedge Fund•Long/Short	$305.0K 2.5K shares

Exited Positions

Institution	Previous Position
R Rafferty Asset Management, LLC Institution	$87.2M 878.1K shares
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	$41.1M 413.8K shares
S Shellback Capital, LP Hedge Fund•Long/Short	$17.7M 178.6K shares
D D. E. Shaw & Co., Inc. Institution	$9.6M 96.3K shares
OZ MANAGEMENT LP Hedge Fund•Multi-Strategy	$6.0M 60.0K shares
T TEXAS PERMANENT SCHOOL FUND Institution	$3.4M 34.6K shares
A AXA Institution	$2.9M 29.3K shares
Hilton Capital Management, LLC Long Only Manager	$2.2M 22.3K shares
X XTX Topco Ltd Institution	$1.9M 19.5K shares
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$1.7M 16.9K shares

Options Activity

Institutions with the largest Call and Put options positions in MKSI as of Q3 2025

Call Positions: 13
Call Value: $248.8M
Put Positions: 11
Put Value: $43.4M

Call Positions

Institution	Position Value
UBS Group AG Institution	$112.3M 9.1K contracts
J JANE STREET GROUP, LLC Institution	$67.0M 5.4K contracts
W WOLVERINE TRADING, LLC Institution	$23.4M 1.9K contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$17.8M 1.4K contracts
Caption Management, LLC Hedge Fund•Long/Short	$8.0M 650.0 contracts
P PEAK6 LLC Institution	$7.6M 615.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$6.9M 558.0 contracts
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	$3.1M 250.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$1.3M 105.0 contracts
DeepCurrents Investment Group LLC Hedge Fund•Multi-Strategy	$594.1K 0.5 contracts

Put Positions

Institution	Position Value
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	$26.6M 2.2K contracts
W WOLVERINE TRADING, LLC Institution	$6.6M 544.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$3.5M 285.0 contracts
AMERIPRISE FINANCIAL INC Institution	$2.5M 198.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$977.8K 79.0 contracts
J JANE STREET GROUP, LLC Institution	$965.4K 78.0 contracts
Walleye Trading LLC RIA/Wealth	$804.5K 65.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$779.8K 63.0 contracts
C Cubist Systematic Strategies, LLC Institution	$532.2K 43.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$86.6K 7.0 contracts

Most Committed Institutions

Institutions with MKSI as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
V VALUE HOLDINGS MANAGEMENT CO. LLC Hedge Fund•Value	Timothy Joseph Curro Managing Partner	5.91% $36.8M	0.44% 297.7K shares	Q4 2016 Held for 8y 11m	$623.8M
E Expect Equity LLC Institution	-	3.81% $3.9M	0.05% 31.5K shares	Q4 2024 Held for 11 months	$102.4M
Polaris Capital Management, Inc. Long Only Manager	Bernard Robert Horn President	3.25% $49.7M	0.60% 401.3K shares	Q1 2020 Held for 5y 8m	$1.5B
H Harvey Partners, LLC Institution	-	3.25% $35.8M	0.43% 289.0K shares	Q2 2023 Held for 2y 5m	$1.1B
H HARBER ASSET MANAGEMENT LLC Institution	-	3.07% $8.5M	0.10% 68.3K shares	Q1 2025 Held for 8 months	$275.3M
Blue Grotto Capital, LLC Hedge Fund•Long/Short	Phillip Greg Deese CFO	3.04% $26.2M	0.32% 211.8K shares	Q1 2024 Held for 1y 8m	$862.3M
Channing Capital Management, LLC Long Only Manager	Rodney Bernard Herenton CEO	2.43% $92.1M	1.11% 744.2K shares	Q1 2025 Held for 8 months	$3.8B
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	Peter Y Chung CEO	2.34% $73.8M	0.89% 596.1K shares	Q2 2025 Held for 5 months	$3.2B
D Divisar Capital Management LLC Hedge Fund•Long/Short	Steven Richard Baughman CEO	2.09% $7.7M	0.09% 62.0K shares	Q2 2025 Held for 5 months	$367.6M
R Roubaix Capital, LLC Hedge Fund•Long/Short	Christopher Edmund Hillary CEO	1.89% $4.2M	0.05% 33.6K shares	Q2 2023 Held for 2y 5m	$220.3M

Hedge Fund Spotlight

Discover hedge funds investing in MKSI

Quent Capital, LLC

Hedge Fund • Long/Short

Portfolio ManagerWilliam Albert Jollie

Portfolio Value: $1.2B
Positions: 1,433
Last Reported: Q3 2025

Sector Allocation

Position in MKS Instruments

Market Value: $8.2K
Shares Held: 66.0
Portfolio Weight: 0.00%
Owned Since: 2022-Q4

Top Holding	Sector	Market Value	Weight
1 Vanguard Russell 1000 Growth VONG	ETF ETF	$129.0M	10.81%
2 SPDR Nuveen Bloomberg Short Term Municipal Bond SHM	ETF ETF	$79.3M	6.64%
3 iShares MSCI EAFE Growth EFG	ETF ETF	$59.0M	4.94%