MKSI Insider Trading

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Insider Trading History
Frequently Asked Questions
About

Insider Ownership Percentage: 0.57%

Insider Buying (Last 12 Months): $0.00

Insider Selling (Last 12 Months): $1,897,976.50

MKS Insider Trading History Chart

MKS Share Price & Price History

^$163.35

▼ -0.05 (-0.03%)

As of 12/4/2025 05:00 PM ET

Days: 30 | 90 | 365

MKS Insider Trading History

Transaction Date	Insider Name	Title	Buy/Sell	Number of Shares	Average Share Price	Total Transaction	Shares Held After Transaction
12/2/2025	Elizabeth Mora	Director	Sell	300	$158.81	$47,643.00	18,963
10/1/2025	Jacqueline F. Moloney	Director	Sell	300	$122.14	$36,642.00	11,562
9/18/2025	David Philip Henry	EVP	Sell	5,000	$130.00	$650,000.00	15,571
9/2/2025	Elizabeth Mora	Director	Sell	300	$99.85	$29,955.00	19,263
8/1/2025	Jacqueline F. Moloney	Director	Sell	300	$92.10	$27,630.00	11,862
7/3/2025	David Philip Henry	EVP	Sell	2,000	$105.00	$210,000.00	20,571
3/3/2025	Elizabeth Mora	Director	Sell	275	$92.46	$25,426.50	17,384
2/18/2025	Gerard G. Colella	Director	Sell	8,000	$104.53	$836,240.00	60,017
12/10/2024	Jacqueline F. Moloney	Director	Sell	300	$114.80	$34,440.00	9,983
12/2/2024	Elizabeth Mora	Director	Sell	275	$113.41	$31,187.75	17,659
10/1/2024	Jacqueline F. Moloney	Director	Sell	250	$108.90	$27,225.00	10,283
9/3/2024	Elizabeth Mora	Director	Sell	275	$115.97	$31,891.75	17,934
8/16/2024	John Edward Williams	EVP	Sell	1,800	$118.71	$213,678.00	13
8/1/2024	Jacqueline F. Moloney	Director	Sell	250	$123.46	$30,865.00	10,533
6/3/2024	Elizabeth Mora	Director	Sell	275	$129.41	$35,587.75	18,209
4/1/2024	Elizabeth Mora	Director	Sell	250	$133.00	$33,250.00	16,862
3/1/2024	Jacqueline F. Moloney	Director	Sell	250	$122.89	$30,722.50	9,161
3/1/2024	Kathleen Flaherty Burke	EVP	Sell	7,411	$122.89	$910,737.79	42,999
2/22/2024	Seth H. Bagshaw	CFO	Sell	32,865	$123.28	$4,051,597.20	1
2/9/2024	Gerard G. Colella	Director	Sell	10,000	$120.00	$1,200,000.00	68,017
1/22/2024	Gerard G. Colella	Director	Sell	10,000	$110.00	$1,100,000.00	78,017
1/2/2024	Elizabeth Mora	Director	Sell	250	$100.90	$25,225.00	17,112
12/1/2023	Jacqueline F. Moloney	Director	Sell	250	$82.23	$20,557.50	11,328
11/7/2023	David Philip Henry	EVP	Buy	2,500	$68.34	$170,850.00	11,073
10/2/2023	Elizabeth Mora	Director	Sell	250	$87.15	$21,787.50	17,362
9/6/2023	Seth H. Bagshaw	CFO	Sell	25,000	$97.30	$2,432,500.00	20,547
8/31/2023	Gerard G. Colella	Director	Sell	10,000	$100.01	$1,000,100.00	88,017
8/28/2023	Jacqueline F. Moloney	Director	Sell	250	$95.25	$23,812.50	11,578
8/7/2023	Kathleen Flaherty Burke	EVP	Sell	11,563	$101.23	$1,170,522.49	42,738
7/3/2023	Elizabeth Mora	Director	Sell	250	$108.49	$27,122.50	17,612
6/1/2023	Elizabeth Mora	Director	Sell	200	$97.16	$19,432.00	17,862
5/8/2023	Carlyle Partners Vi Cayman Hol	Major Shareholder	Sell	2,000,000	$86.12	$172,240,000.00	6,482,732
3/15/2023	Elizabeth Mora	Director	Sell	200	$86.67	$17,334.00	15,693

SEC Filings (Institutional Ownership Changes) for MKS (NASDAQ:MKSI)

99.79% of MKS stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

MKS Institutional Trading History

Reporting Date	Hedge Fund	Shares Held	Market Value	% of Portfolio	Quarterly Change in Shares	Ownership in Company
12/2/2025	Allworth Financial LP	471	$58K	0.0%	+34.2%	0.001%
12/2/2025	Swiss Life Asset Management Ltd	3,107	$0.39M	0.0%	N/A	0.005%
11/19/2025	Coldstream Capital Management Inc.	4,836	$0.60M	0.0%	-3.8%	0.007%
11/19/2025	Danske Bank A S	300	$37K	0.0%	N/A	0.000%
11/17/2025	Hancock Whitney Corp	5,317	$0.66M	0.0%	N/A	0.008%
11/17/2025	CANADA LIFE ASSURANCE Co	55,242	$6.75M	0.0%	-0.6%	0.082%
11/17/2025	Woodline Partners LP	4,713	$0.58M	0.0%	+15.9%	0.007%
11/17/2025	Utah Retirement Systems	3,600	$0.45M	0.0%	-67.4%	0.005%
11/17/2025	Verition Fund Management LLC	5,903	$0.73M	0.0%	-6.5%	0.009%
11/17/2025	Tidal Investments LLC	24,279	$3.01M	0.0%	+1.2%	0.036%
11/17/2025	Shapiro Capital Management LLC	309,050	$38.25M	1.7%	-21.0%	0.460%
11/17/2025	Sig Brokerage LP	2,785	$0.35M	0.0%	+18.6%	0.004%
11/17/2025	Sora Investors LLC	33,956	$4.20M	0.4%	-41.1%	0.051%
11/17/2025	Polar Capital Holdings Plc	144,626	$17.90M	0.1%	+31.3%	0.215%
11/17/2025	Prelude Capital Management LLC	7,403	$0.92M	0.1%	N/A	0.011%
11/17/2025	Public Employees Retirement System of Ohio	62,288	$7.71M	0.0%	-12.4%	0.093%
11/17/2025	Park West Asset Management LLC	60,000	$7.43M	0.6%	N/A	0.089%
11/17/2025	Nomura Holdings Inc.	426,509	$52.79M	0.1%	+316.9%	0.635%
11/17/2025	Northwestern Mutual Wealth Management Co.	422	$52K	0.0%	+1,734.8%	0.001%
11/17/2025	Northern Trust Corp	591,899	$73.26M	0.0%	-2.5%	0.881%
11/17/2025	Mercer Global Advisors Inc. ADV	7,413	$0.92M	0.0%	+25.7%	0.011%
11/17/2025	National Bank of Canada FI	5,582	$0.69M	0.0%	-94.7%	0.008%
11/17/2025	Millennium Management LLC	446,248	$55.23M	0.0%	+9,165.9%	0.664%
11/17/2025	Larson Financial Group LLC	533	$66K	0.0%	+26.6%	0.001%
11/17/2025	Lido Advisors LLC	5,994	$0.74M	0.0%	+69.9%	0.009%
11/17/2025	Jain Global LLC	133,197	$16.49M	0.1%	+132.4%	0.198%
11/17/2025	Harvey Partners LLC	289,000	$35.77M	3.2%	+7.2%	0.430%
11/17/2025	Gotham Asset Management LLC	199,160	$24.65M	0.1%	+6.0%	0.297%
11/17/2025	Dean Capital Management	11,713	$1.45M	0.6%	+65.9%	0.017%
11/17/2025	Delta Global Management LP	151,535	$18.76M	1.4%	N/A	0.226%
11/17/2025	Divisar Capital Management LLC	62,000	$7.67M	2.1%	+19.2%	0.092%
11/17/2025	Brevan Howard Capital Management LP	36,334	$4.50M	0.0%	+1,550.0%	0.054%
11/17/2025	California Public Employees Retirement System	114,431	$14.16M	0.0%	+5.4%	0.170%
11/17/2025	Alliancebernstein L.P.	84,712	$10.49M	0.0%	-1.4%	0.126%
11/14/2025	Schonfeld Strategic Advisors LLC	3,692	$0.46M	0.0%	N/A	0.005%
11/14/2025	Creative Planning	43,100	$5.33M	0.0%	-3.6%	0.064%
11/14/2025	SummitTX Capital L.P.	196,734	$24.35M	1.0%	+30.3%	0.293%
11/14/2025	Raymond James Financial Inc.	177,255	$21.94M	0.0%	+4.3%	0.264%
11/14/2025	Amundi	102,191	$12.65M	0.0%	+62.1%	0.152%
11/14/2025	Horizon Investments LLC	5,666	$0.70M	0.0%	-7.9%	0.008%
11/14/2025	Harber Asset Management LLC	68,289	$8.45M	3.0%	-28.9%	0.102%
11/14/2025	Balyasny Asset Management L.P.	850,245	$105.24M	0.1%	+16.0%	1.266%
11/14/2025	Brooklyn Investment Group	5,078	$0.63M	0.0%	+108.5%	0.008%
11/14/2025	UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC	206,435	$25.55M	0.0%	-35.8%	0.307%
11/14/2025	Tower Research Capital LLC TRC	12,446	$1.54M	0.0%	+169.4%	0.019%
11/14/2025	Two Sigma Investments LP	6,200	$0.77M	0.0%	+29.2%	0.009%
11/14/2025	Vident Advisory LLC	2,407	$0.30M	0.0%	N/A	0.004%
11/14/2025	Concentric Capital Strategies LP	74,913	$9.27M	0.4%	-19.1%	0.112%
11/14/2025	Ossiam	41,215	$5.10M	0.1%	N/A	0.061%
11/14/2025	iSAM Funds UK Ltd	3,942	$0.49M	0.1%	N/A	0.006%
11/14/2025	NorthRock Partners LLC	2,649	$0.33M	0.0%	N/A	0.004%
11/14/2025	Comerica Bank	191,131	$23.66M	0.1%	+170.2%	0.285%
11/13/2025	Pathstone Holdings LLC	21,067	$2.61M	0.0%	-2.3%	0.031%
11/13/2025	Blue Grotto Capital LLC	211,848	$26.22M	3.0%	+13.2%	0.315%
11/13/2025	Kennedy Capital Management LLC	171,557	$21.23M	0.5%	-7.6%	0.255%
11/13/2025	Arrowstreet Capital Limited Partnership	39,154	$4.85M	0.0%	N/A	0.058%
11/13/2025	FourThought Financial Partners LLC	1,864	$0.23M	0.0%	N/A	0.003%
11/13/2025	Ceredex Value Advisors LLC	200,125	$24.77M	0.6%	N/A	0.298%
11/13/2025	Capital International Investors	3,254,663	$402.83M	0.1%	+0.1%	4.846%
11/13/2025	Legal & General Group Plc	103,421	$12.80M	0.0%	-4.5%	0.154%
11/13/2025	Fieldview Capital Management LLC	24,360	$3.02M	0.5%	N/A	0.036%
11/13/2025	Swiss National Bank	130,000	$16.09M	0.0%	+0.9%	0.194%
11/13/2025	Inceptionr LLC	2,609	$0.32M	0.1%	N/A	0.004%
11/13/2025	Dynamic Technology Lab Private Ltd	3,270	$0.41M	0.1%	N/A	0.005%
11/13/2025	Natixis Advisors LLC	481,168	$59.55M	0.1%	-16.2%	0.716%
11/13/2025	First Trust Advisors LP	116,332	$14.40M	0.0%	-17.7%	0.173%
11/13/2025	Neo Ivy Capital Management	3,758	$0.47M	0.1%	N/A	0.006%
11/13/2025	Neuberger Berman Group LLC	1,634,796	$202.34M	0.1%	-13.4%	2.434%
11/12/2025	Gabelli Funds LLC	46,326	$5.73M	0.0%	+2.2%	0.069%
11/12/2025	Gamco Investors INC. ET AL	7,885	$0.98M	0.0%	-7.1%	0.012%
11/12/2025	Barclays PLC	367,148	$45.44M	0.0%	-71.9%	0.547%
11/12/2025	Crossmark Global Holdings Inc.	2,959	$0.37M	0.0%	-28.3%	0.004%
11/12/2025	Orion Porfolio Solutions LLC	17,372	$2.15M	0.0%	-3.3%	0.026%
11/12/2025	Dimensional Fund Advisors LP	1,265,365	$156.60M	0.0%	+30.8%	1.884%
11/12/2025	Teachers Retirement System of The State of Kentucky	38,963	$4.82M	0.0%	+1.9%	0.058%
11/12/2025	Victory Capital Management Inc.	3,582,216	$443.37M	0.3%	-7.3%	5.334%
11/12/2025	CI Investments Inc.	1,967	$0.24M	0.0%	-5.8%	0.003%
11/12/2025	Roubaix Capital LLC	33,588	$4.16M	1.9%	-37.2%	0.050%
11/12/2025	Journey Strategic Wealth LLC	6,450	$0.80M	0.0%	+2.8%	0.010%
11/12/2025	Royce & Associates LP	827,127	$102.37M	1.0%	-9.6%	1.232%
11/12/2025	Aster Capital Management DIFC Ltd	776	$96K	0.0%	N/A	0.001%
11/12/2025	Handelsbanken Fonder AB	109,600	$13.57M	0.0%	+522.7%	0.163%
11/12/2025	Andra AP fonden	14,595	$1.81M	0.0%	+212.7%	0.022%
11/12/2025	Banco Santander S.A.	11,499	$1.42M	0.0%	-24.5%	0.017%
11/12/2025	Xponance Inc.	8,143	$1.01M	0.0%	+2.7%	0.012%
11/12/2025	Westfield Capital Management Co. LP	323,364	$40.02M	0.2%	N/A	0.481%
11/12/2025	Intech Investment Management LLC	4,477	$0.55M	0.0%	N/A	0.007%
11/12/2025	US Bancorp DE	6,370	$0.79M	0.0%	-5.8%	0.009%
11/10/2025	MAI Capital Management	1,057	$0.13M	0.0%	+10.6%	0.002%
11/10/2025	EverSource Wealth Advisors LLC	737	$91K	0.0%	-12.1%	0.001%
11/10/2025	Clearstead Advisors LLC	2,142	$0.27M	0.0%	-26.2%	0.003%
11/10/2025	Ameritas Investment Partners Inc.	12,589	$1.56M	0.0%	-3.3%	0.019%
11/10/2025	Channing Capital Management LLC	744,162	$92.11M	2.4%	-24.9%	1.108%
11/10/2025	OneDigital Investment Advisors LLC	2,060	$0.26M	0.0%	N/A	0.003%
11/10/2025	Citigroup Inc.	65,787	$8.14M	0.0%	-85.3%	0.098%
11/7/2025	Syon Capital LLC	2,467	$0.31M	0.0%	N/A	0.004%
11/7/2025	Readystate Asset Management LP	55,079	$6.82M	0.3%	-14.1%	0.082%
11/7/2025	First National Bank of Omaha	13,474	$1.67M	0.1%	N/A	0.020%
11/7/2025	Vanguard Group Inc.	7,752,097	$959.48M	0.0%	+4.0%	11.543%
11/7/2025	Phillips Wealth Planners LLC	1,808	$0.22M	0.2%	N/A	0.003%

Data available starting January 2016

MKS Instruments, Inc. provides foundational technology solutions to semiconductor manufacturing, electronics and packaging, and specialty industrial applications in the United States, Germany, China, South Korea, and internationally. It operates through Vacuum Solutions Division (VSD), Photonics Solutions Division (PSD), and Material Solutions Division (MSD) segments. The VSD segment provides foundational technology solutions, including pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, electronic control technology, reactive gas generation and delivery, power generation and delivery, and vacuum technology. The PSD segment offers range of solutions, which include lasers, beam measurement and profiling, precision motion control, vibration isolation systems, photonics instruments, temperature sensing, opto-mechanical components, optical elements, systems for flexible PCB laser processing, and laser-based systems, as well as high density interconnect PCB and package manufacturing. The MSD segment develops, process, and manufactures technologies comprising advanced surface modification, electroless and electrolytic plating, and surface finishing for chemistry, equipment, software, and services markets, as well as high-technology applications. In addition, the company sells its products and services through direct sales, network of independent distributors, and sales representatives, as well as websites, including product catalogs. The company was incorporated in 1961 and is headquartered in Andover, Massachusetts.

Today's Range

Now: $163.35

$160.56

$164.06

50 Day Range

MA: $142.30

$121.26

$163.40

52 Week Range

Now: $163.35

$54.84

$164.79

Volume

843,624 shs

Average Volume

921,881 shs

Market Capitalization

$10.97 billion

P/E Ratio

39.65

Dividend Yield

0.54%

Beta

1.93

Who are the company insiders with the largest holdings of MKS?: MKS's top insider investors include:
Gerard G Colella (Director)
Kathleen Flaherty Burke (EVP)
David Philip Henry (EVP)
Elizabeth Mora (Director)
Jacqueline F Moloney (Director)
John Edward Williams (EVP)
Seth H Bagshaw (CFO)
Learn More about top insider investors at MKS.
Who are the major institutional investors of MKS?: MKS's top institutional shareholders include:
Vanguard Group Inc. — 11.54%
Victory Capital Management Inc. — 5.33%
Capital International Investors — 4.85%
Neuberger Berman Group LLC — 2.43%
Nordea Investment Management AB — 2.38%
Cooke & Bieler LP — 1.97%
Learn More about top institutional investors of MKS stock.
Which major investors are selling MKS stock?: During the last quarter, MKSI stock was sold by these institutional investors:
New York State Common Retirement Fund
Barclays PLC
Madison Asset Management LLC
Citigroup Inc.
Victory Capital Management Inc.
Neuberger Berman Group LLC
Channing Capital Management LLC
UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC
Within the previous year, company insiders that have sold MKS company stock include:
Gerard G Colella (Director)
Kathleen Flaherty Burke (EVP)
David Philip Henry (EVP)
Elizabeth Mora (Director)
Learn More investors selling MKS stock.
Which major investors are buying MKS stock?: In the previous quarter, MKSI stock was bought by institutional investors including:
Millennium Management LLC
Nomura Holdings Inc.
Westfield Capital Management Co. LP
Dimensional Fund Advisors LP
Vanguard Group Inc.
Summit Partners Public Asset Management LLC
Ceredex Value Advisors LLC
Delta Global Management LP