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MKSI Insider Trading

Insider Ownership Percentage: 0.51%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $1,863,536.50

MKS Insider Trading History Chart

This chart shows the insider buying and selling history at MKS by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

MKS Share Price & Price History

Current Price: $218.31
Price Change: ▼ Price Decrease of -11.27 (-4.91%)
As of 02/4/2026 04:13 PM ET

This chart shows the closing price history over time for MKSI up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

MKS Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
12/2/2025Elizabeth MoraDirectorSell300$158.81$47,643.0018,963View SEC Filing Icon  
10/1/2025Jacqueline F. MoloneyDirectorSell300$122.14$36,642.0011,562View SEC Filing Icon  
9/18/2025David Philip HenryEVPSell5,000$130.00$650,000.0015,571View SEC Filing Icon  
9/2/2025Elizabeth MoraDirectorSell300$99.85$29,955.0019,263View SEC Filing Icon  
8/1/2025Jacqueline F. MoloneyDirectorSell300$92.10$27,630.0011,862View SEC Filing Icon  
7/3/2025David Philip HenryEVPSell2,000$105.00$210,000.0020,571View SEC Filing Icon  
3/3/2025Elizabeth MoraDirectorSell275$92.46$25,426.5017,384View SEC Filing Icon  
2/18/2025Gerard G. ColellaDirectorSell8,000$104.53$836,240.0060,017View SEC Filing Icon  
12/10/2024Jacqueline F. MoloneyDirectorSell300$114.80$34,440.009,983View SEC Filing Icon  
12/2/2024Elizabeth MoraDirectorSell275$113.41$31,187.7517,659View SEC Filing Icon  
10/1/2024Jacqueline F. MoloneyDirectorSell250$108.90$27,225.0010,283View SEC Filing Icon  
9/3/2024Elizabeth MoraDirectorSell275$115.97$31,891.7517,934View SEC Filing Icon  
8/16/2024John Edward WilliamsEVPSell1,800$118.71$213,678.0013View SEC Filing Icon  
8/1/2024Jacqueline F. MoloneyDirectorSell250$123.46$30,865.0010,533View SEC Filing Icon  
6/3/2024Elizabeth MoraDirectorSell275$129.41$35,587.7518,209View SEC Filing Icon  
4/1/2024Elizabeth MoraDirectorSell250$133.00$33,250.0016,862View SEC Filing Icon  
3/1/2024Jacqueline F. MoloneyDirectorSell250$122.89$30,722.509,161View SEC Filing Icon  
3/1/2024Kathleen Flaherty BurkeEVPSell7,411$122.89$910,737.7942,999View SEC Filing Icon  
2/22/2024Seth H. BagshawCFOSell32,865$123.28$4,051,597.201View SEC Filing Icon  
2/9/2024Gerard G. ColellaDirectorSell10,000$120.00$1,200,000.0068,017View SEC Filing Icon  
1/22/2024Gerard G. ColellaDirectorSell10,000$110.00$1,100,000.0078,017View SEC Filing Icon  
1/2/2024Elizabeth MoraDirectorSell250$100.90$25,225.0017,112View SEC Filing Icon  
12/1/2023Jacqueline F. MoloneyDirectorSell250$82.23$20,557.5011,328View SEC Filing Icon  
11/7/2023David Philip HenryEVPBuy2,500$68.34$170,850.0011,073View SEC Filing Icon  
10/2/2023Elizabeth MoraDirectorSell250$87.15$21,787.5017,362View SEC Filing Icon  
9/6/2023Seth H. BagshawCFOSell25,000$97.30$2,432,500.0020,547View SEC Filing Icon  
8/31/2023Gerard G. ColellaDirectorSell10,000$100.01$1,000,100.0088,017View SEC Filing Icon  
8/28/2023Jacqueline F. MoloneyDirectorSell250$95.25$23,812.5011,578View SEC Filing Icon  
8/7/2023Kathleen Flaherty BurkeEVPSell11,563$101.23$1,170,522.4942,738View SEC Filing Icon  
7/3/2023Elizabeth MoraDirectorSell250$108.49$27,122.5017,612View SEC Filing Icon  
6/1/2023Elizabeth MoraDirectorSell200$97.16$19,432.0017,862View SEC Filing Icon  
5/8/2023Carlyle Partners Vi Cayman HolMajor ShareholderSell2,000,000$86.12$172,240,000.006,482,732View SEC Filing Icon  
3/15/2023Elizabeth MoraDirectorSell200$86.67$17,334.0015,693View SEC Filing Icon  
See Full Table

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

This chart shows the instiutional buying and selling at MKSI by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

MKS Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
2/4/2026Securian Asset Management Inc.4,889$0.78M0.0%-2.0%0.007%Search for SEC Filing on Google Icon
2/3/2026Crossmark Global Holdings Inc.3,340$0.53M0.0%+12.9%0.005%Search for SEC Filing on Google Icon
2/3/2026Ethic Inc.16,366$2.62M0.0%+19.3%0.024%Search for SEC Filing on Google Icon
2/3/2026Ballentine Partners LLC1,577$0.25M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/3/2026Crestwood Advisors Group LLC1,287$0.21M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/3/2026Sequoia Financial Advisors LLC2,036$0.33M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/3/2026Robeco Schweiz AG52,630$8.41M0.2%N/A0.078%Search for SEC Filing on Google Icon
2/3/2026Equitable Trust Co.11,752$1.88M0.1%+10.3%0.017%Search for SEC Filing on Google Icon
2/2/2026Principal Financial Group Inc.765,595$122.35M0.1%-6.5%1.140%Search for SEC Filing on Google Icon
2/2/2026Strs Ohio80,803$12.91M0.0%+9.8%0.120%Search for SEC Filing on Google Icon
2/2/2026Horizon Investments LLC7,136$1.14M0.0%+25.9%0.011%Search for SEC Filing on Google Icon
2/2/2026Fifth Third Bancorp620$99K0.0%-90.6%0.001%Search for SEC Filing on Google Icon
1/30/2026State of New Jersey Common Pension Fund D23,156$3.70M0.0%-1.3%0.034%Search for SEC Filing on Google Icon
1/30/2026Innealta Capital LLC1,436$0.23M0.1%N/A0.002%Search for SEC Filing on Google Icon
1/30/2026Mitsubishi UFJ Trust & Banking Corp7,086$1.13M0.0%-3.9%0.011%Search for SEC Filing on Google Icon
1/30/2026M&T Bank Corp22,044$3.52M0.0%+5.5%0.033%Search for SEC Filing on Google Icon
1/29/2026Comerica Bank39,852$6.37M0.0%-79.1%0.059%Search for SEC Filing on Google Icon
1/29/2026Washington Capital Management Inc.5,500$0.88M0.7%-14.1%0.008%Search for SEC Filing on Google Icon
1/29/2026Pictet Asset Management Holding SA10,247$1.64M0.0%+7.9%0.015%Search for SEC Filing on Google Icon
1/29/2026State of Michigan Retirement System15,840$2.53M0.0%-1.2%0.024%Search for SEC Filing on Google Icon
1/29/2026Inscription Capital LLC1,638$0.26M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/29/2026Sanctuary Advisors LLC9,073$1.45M0.0%+7.0%0.014%Search for SEC Filing on Google Icon
1/29/2026Teachers Retirement System of The State of Kentucky37,904$6.06M0.0%-2.7%0.056%Search for SEC Filing on Google Icon
1/29/2026Vanguard Group Inc.7,487,305$1.20B0.0%-3.4%11.147%Search for SEC Filing on Google Icon
1/29/2026Polaris Capital Management LLC265,100$42.36M3.5%-33.9%0.395%Search for SEC Filing on Google Icon
1/28/2026Arizona State Retirement System18,809$3.01M0.0%-5.1%0.028%Search for SEC Filing on Google Icon
1/28/2026Legacy Capital Group California Inc.1,565$0.25M0.1%N/A0.002%Search for SEC Filing on Google Icon
1/28/2026Kingswood Wealth Advisors LLC2,779$0.44M0.0%N/A0.004%Search for SEC Filing on Google Icon
1/28/2026M&T Bank Corp83,154$13.29M0.0%+298.0%0.124%Search for SEC Filing on Google Icon
1/28/2026Universal Beteiligungs und Servicegesellschaft mbH17,492$2.80M0.0%+43.0%0.026%Search for SEC Filing on Google Icon
1/28/2026OVERSEA CHINESE BANKING Corp Ltd62,830$10.04M0.3%+168.3%0.094%Search for SEC Filing on Google Icon
1/27/2026Optas LLC1,319$0.21M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/27/2026Evergreen Capital Management LLC3,435$0.55M0.0%-3.2%0.005%Search for SEC Filing on Google Icon
1/27/2026Hudson Edge Investment Partners Inc.6,310$1.01M0.1%-39.3%0.009%Search for SEC Filing on Google Icon
1/27/2026Earned Wealth Advisors LLC1,275$0.20M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/27/2026Deroy & Devereaux Private Investment Counsel Inc.23,555$3.76M0.2%N/A0.035%Search for SEC Filing on Google Icon
1/27/2026GHP Investment Advisors Inc.47,561$7.60M0.3%+3.0%0.071%Search for SEC Filing on Google Icon
1/26/2026Merit Financial Group LLC3,411$0.55M0.0%+16.2%0.005%Search for SEC Filing on Google Icon
1/26/2026CWM LLC7,693$1.23M0.0%+15.0%0.011%Search for SEC Filing on Google Icon
1/26/2026KBC Group NV2,039$0.33M0.0%+14.0%0.003%Search for SEC Filing on Google Icon
1/23/2026Farther Finance Advisors LLC348$56K0.0%+118.9%0.001%Search for SEC Filing on Google Icon
1/23/2026Steph & Co.1,162$0.19M0.1%+110.1%0.002%Search for SEC Filing on Google Icon
1/23/2026State of Alaska Department of Revenue6,666$1.07M0.0%-9.2%0.010%Search for SEC Filing on Google Icon
1/23/2026Tectonic Advisors LLC3,112$0.50M0.0%+2.7%0.005%Search for SEC Filing on Google Icon
1/23/2026Burney Co.1,270$0.20M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/23/2026Choreo LLC1,448$0.23M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/21/2026Yousif Capital Management LLC20,815$3.33M0.0%-1.4%0.031%Search for SEC Filing on Google Icon
1/21/2026Greenleaf Trust2,634$0.42M0.0%+30.5%0.004%Search for SEC Filing on Google Icon
1/21/2026Aaron Wealth Advisors LLC5,372$0.86M0.0%+19.9%0.008%Search for SEC Filing on Google Icon
1/21/2026Phocas Financial Corp.73,365$11.72M1.5%-0.2%0.109%Search for SEC Filing on Google Icon
1/20/2026eCIO Inc.394$63K0.0%N/A0.001%Search for SEC Filing on Google Icon
1/20/2026Harbor Capital Advisors Inc.18,221$2.91M0.2%-23.2%0.027%Search for SEC Filing on Google Icon
1/16/2026Earned Wealth Advisors LLC1,275$0.20M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/16/2026Blue Trust Inc.4,227$0.68M0.0%+4.5%0.006%Search for SEC Filing on Google Icon
1/15/2026Retirement Systems of Alabama156,714$25.04M0.1%-0.4%0.233%Search for SEC Filing on Google Icon
1/14/2026USA Financial Formulas164$26K0.0%N/A0.000%Search for SEC Filing on Google Icon
1/14/2026Exchange Traded Concepts LLC1,442$0.23M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/13/2026Norden Group LLC1,361$0.22M0.0%N/A0.002%Search for SEC Filing on Google Icon
1/9/2026SG Americas Securities LLC19,124$3.06M0.0%+265.2%0.028%Search for SEC Filing on Google Icon
1/9/2026Assenagon Asset Management S.A.92,856$14.84M0.0%N/A0.138%Search for SEC Filing on Google Icon
1/8/2026Fulton Bank N.A.3,918$0.63M0.0%-6.1%0.006%Search for SEC Filing on Google Icon
1/8/2026Wealth Enhancement Advisory Services LLC11,412$1.82M0.0%+24.5%0.017%Search for SEC Filing on Google Icon
1/8/2026Oliver Luxxe Assets LLC22,641$3.62M0.6%N/A0.034%Search for SEC Filing on Google Icon
1/8/2026Wedmont Private Capital3,064$0.49M0.0%+7.4%0.005%Search for SEC Filing on Google Icon
1/8/2026Nordea Investment Management AB599,842$96.61M0.1%-62.4%0.893%Search for SEC Filing on Google Icon
1/7/2026MassMutual Private Wealth & Trust FSB898$0.14M0.0%+6.9%0.001%Search for SEC Filing on Google Icon
1/6/2026Avior Wealth Management LLC2,695$0.43M0.0%+23.9%0.004%Search for SEC Filing on Google Icon
1/5/2026GAMMA Investing LLC2,862$0.46M0.0%+15.1%0.004%Search for SEC Filing on Google Icon
12/15/2025Mirabella Financial Services LLP2,775$0.34M0.0%N/A0.004%Search for SEC Filing on Google Icon
12/2/2025Allworth Financial LP471$58K0.0%+34.2%0.001%Search for SEC Filing on Google Icon
12/2/2025Swiss Life Asset Management Ltd3,107$0.39M0.0%N/A0.005%Search for SEC Filing on Google Icon
11/19/2025Coldstream Capital Management Inc.4,836$0.60M0.0%-3.8%0.007%Search for SEC Filing on Google Icon
11/19/2025Danske Bank A S300$37K0.0%N/A0.000%Search for SEC Filing on Google Icon
11/17/2025Hancock Whitney Corp5,317$0.66M0.0%N/A0.008%Search for SEC Filing on Google Icon
11/17/2025CANADA LIFE ASSURANCE Co55,242$6.75M0.0%-0.6%0.082%Search for SEC Filing on Google Icon
11/17/2025Woodline Partners LP4,713$0.58M0.0%+15.9%0.007%Search for SEC Filing on Google Icon
11/17/2025Utah Retirement Systems3,600$0.45M0.0%-67.4%0.005%Search for SEC Filing on Google Icon
11/17/2025Verition Fund Management LLC5,903$0.73M0.0%-6.5%0.009%Search for SEC Filing on Google Icon
11/17/2025Tidal Investments LLC24,279$3.01M0.0%+1.2%0.036%Search for SEC Filing on Google Icon
11/17/2025Shapiro Capital Management LLC309,050$38.25M1.7%-21.0%0.460%Search for SEC Filing on Google Icon
11/17/2025Sig Brokerage LP2,785$0.35M0.0%+18.6%0.004%Search for SEC Filing on Google Icon
11/17/2025Sora Investors LLC33,956$4.20M0.4%-41.1%0.051%Search for SEC Filing on Google Icon
11/17/2025Polar Capital Holdings Plc144,626$17.90M0.1%+31.3%0.215%Search for SEC Filing on Google Icon
11/17/2025Prelude Capital Management LLC7,403$0.92M0.1%N/A0.011%Search for SEC Filing on Google Icon
11/17/2025Public Employees Retirement System of Ohio62,288$7.71M0.0%-12.4%0.093%Search for SEC Filing on Google Icon
11/17/2025Park West Asset Management LLC60,000$7.43M0.6%N/A0.089%Search for SEC Filing on Google Icon
11/17/2025Nomura Holdings Inc.426,509$52.79M0.1%+316.9%0.635%Search for SEC Filing on Google Icon
11/17/2025Northwestern Mutual Wealth Management Co.422$52K0.0%+1,734.8%0.001%Search for SEC Filing on Google Icon
11/17/2025Northern Trust Corp591,899$73.26M0.0%-2.5%0.881%Search for SEC Filing on Google Icon
11/17/2025Mercer Global Advisors Inc. ADV7,413$0.92M0.0%+25.7%0.011%Search for SEC Filing on Google Icon
11/17/2025National Bank of Canada FI5,582$0.69M0.0%-94.7%0.008%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC446,248$55.23M0.0%+9,165.9%0.664%Search for SEC Filing on Google Icon
11/17/2025Larson Financial Group LLC533$66K0.0%+26.6%0.001%Search for SEC Filing on Google Icon
11/17/2025Lido Advisors LLC5,994$0.74M0.0%+69.9%0.009%Search for SEC Filing on Google Icon
11/17/2025Jain Global LLC133,197$16.49M0.1%+132.4%0.198%Search for SEC Filing on Google Icon
11/17/2025Harvey Partners LLC289,000$35.77M3.2%+7.2%0.430%Search for SEC Filing on Google Icon
11/17/2025Gotham Asset Management LLC199,160$24.65M0.1%+6.0%0.297%Search for SEC Filing on Google Icon
11/17/2025Dean Capital Management11,713$1.45M0.6%+65.9%0.017%Search for SEC Filing on Google Icon
11/17/2025Delta Global Management LP151,535$18.76M1.4%N/A0.226%Search for SEC Filing on Google Icon
11/17/2025Divisar Capital Management LLC62,000$7.67M2.1%+19.2%0.092%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
MKS logo
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.
Read More on MKS

Today's Range

Now: $218.31
Low: $212.91
High: $237.93

50 Day Range

MA: $181.75
Low: $148.70
High: $243.88

52 Week Range

Now: $218.31
Low: $54.84
High: $246.35

Volume

1,724,193 shs

Average Volume

1,531,969 shs

Market Capitalization

$14.66 billion

P/E Ratio

53.12

Dividend Yield

0.38%

Beta

1.95

Who are the company insiders with the largest holdings of MKS?

MKS's top insider investors include:
  1. Gerard G Colella (Director)
  2. Kathleen Flaherty Burke (EVP)
  3. David Philip Henry (EVP)
  4. Elizabeth Mora (Director)
  5. Jacqueline F Moloney (Director)
  6. John Edward Williams (EVP)
  7. 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:
  1. Vanguard Group Inc. — 11.15%
  2. Principal Financial Group Inc. — 1.14%
  3. Nordea Investment Management AB — 0.89%
  4. Polaris Capital Management LLC — 0.39%
  5. Retirement Systems of Alabama — 0.23%
  6. Assenagon Asset Management S.A. — 0.14%
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:
  1. Nordea Investment Management AB
  2. Vanguard Group Inc.
  3. Comerica Bank
  4. Polaris Capital Management LLC
  5. Principal Financial Group Inc.
  6. Fifth Third Bancorp
  7. Harbor Capital Advisors Inc.
  8. Hudson Edge Investment Partners Inc.
Within the previous year, company insiders that have sold MKS company stock include:
  1. Gerard G Colella (Director)
  2. Kathleen Flaherty Burke (EVP)
  3. David Philip Henry (EVP)
  4. 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:
  1. Assenagon Asset Management S.A.
  2. M&T Bank Corp
  3. Robeco Schweiz AG
  4. OVERSEA CHINESE BANKING Corp Ltd
  5. Deroy & Devereaux Private Investment Counsel Inc.
  6. Oliver Luxxe Assets LLC
  7. SG Americas Securities LLC
  8. Strs Ohio