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MKSI Insider Trading

Insider Ownership Percentage: 0.57%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $18,289,968.89

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: $227.13
Price Change: ▼ Price Decrease of -9.72 (-4.10%)
As of 03/20/2026 05:00 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
3/12/2026Jacqueline F. MoloneyDirectorSell340$213.77$72,681.8010,393View SEC Filing Icon  
3/6/2026Eric Robert TarantoEVPSell4,568$220.52$1,007,335.3615,445View SEC Filing Icon  
3/2/2026Elizabeth MoraDirectorSell300$239.44$71,832.0018,663View SEC Filing Icon  
2/24/2026Gerald G ColellaDirectorSell10,000$253.97$2,539,700.0040,017View SEC Filing Icon  
2/20/2026David Philip HenryEVPSell2,000$261.56$523,120.0018,841View SEC Filing Icon  
2/20/2026Eric Robert TarantoEVPSell1,453$247.55$359,690.1520,013View SEC Filing Icon  
2/20/2026Gerald G ColellaDirectorSell10,000$252.90$2,529,000.0050,017View SEC Filing Icon  
2/20/2026Jacqueline F. MoloneyDirectorSell829$247.55$205,218.9510,733View SEC Filing Icon  
2/20/2026John Edward WilliamsEVPSell2,043$256.41$523,845.633,640View SEC Filing Icon  
2/20/2026John Tseng-Chung LeeCEOSell30,000$256.77$7,703,100.00154,696View SEC Filing Icon  
2/20/2026Kathleen Flaherty BurkeEVPSell4,254$250.00$1,063,500.0053,794View SEC Filing Icon  
2/20/2026Michelle M MccarthyCAOSell1,466$250.00$366,500.00View SEC Filing Icon  
2/20/2026Peter J. Cannone, IIIDirectorSell1,250$258.06$322,575.008,362View SEC Filing Icon  
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  
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
3/20/2026Hsbc Holdings PLC9,390$1.51M0.0%-50.0%0.014%Search for SEC Filing on Google Icon
3/17/2026Rockefeller Capital Management L.P.557$89K0.0%+34.2%0.001%Search for SEC Filing on Google Icon
3/13/2026World Investment Advisors1,319$0.21M0.0%-18.5%0.002%Search for SEC Filing on Google Icon
3/9/2026Corient Private Wealth LLC11,855$1.90M0.0%+102.3%0.018%Search for SEC Filing on Google Icon
3/6/2026Hsbc Holdings PLC9,390$1.51M0.0%-50.0%0.014%Search for SEC Filing on Google Icon
2/26/2026Alpine Global Management LLC4,000$0.64M0.1%N/A0.006%Search for SEC Filing on Google Icon
2/24/2026Pacer Advisors Inc.10,691$1.71M0.0%-11.0%0.016%Search for SEC Filing on Google Icon
2/23/2026Kera Capital Partners Inc.2,292$0.37M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/23/2026Virtu Financial LLC7,295$1.17M0.0%N/A0.011%Search for SEC Filing on Google Icon
2/20/2026Dean Capital Management12,090$1.93M0.8%+3.2%0.018%Search for SEC Filing on Google Icon
2/19/2026Corient Private Wealth LLC133,036$21.26M0.0%+2,170.2%0.198%Search for SEC Filing on Google Icon
2/18/2026Mercer Global Advisors Inc. ADV10,968$1.75M0.0%+48.0%0.016%Search for SEC Filing on Google Icon
2/18/2026Vident Advisory LLC2,190$0.35M0.0%-9.0%0.003%Search for SEC Filing on Google Icon
2/18/2026State of Tennessee Department of Treasury29,270$4.68M0.0%-12.6%0.044%Search for SEC Filing on Google Icon
2/18/2026EP Wealth Advisors LLC4,384$0.70M0.0%N/A0.007%Search for SEC Filing on Google Icon
2/18/2026Mackenzie Financial Corp4,175$0.67M0.0%N/A0.006%Search for SEC Filing on Google Icon
2/18/2026NewEdge Advisors LLC2,659$0.43M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/18/2026Empowered Funds LLC3,699$0.59M0.0%-10.3%0.006%Search for SEC Filing on Google Icon
2/18/2026XTX Topco Ltd19,944$3.19M0.1%N/A0.030%Search for SEC Filing on Google Icon
2/18/2026SummitTX Capital L.P.205,750$32.88M1.0%+4.6%0.306%Search for SEC Filing on Google Icon
2/18/2026Polymer Capital Management US LLC2,425$0.39M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/18/2026Old West Investment Management LLC16,350$2.61M0.5%+3.2%0.024%Search for SEC Filing on Google Icon
2/18/2026Millennium Management LLC817,251$130.60M0.1%+83.1%1.217%Search for SEC Filing on Google Icon
2/18/2026Infrastructure Capital Advisors LLC3,572$0.57M0.1%-22.2%0.005%Search for SEC Filing on Google Icon
2/18/2026Inspire Investing LLC10,946$1.75M0.2%+197.4%0.016%Search for SEC Filing on Google Icon
2/18/2026Gotham Asset Management LLC225,215$35.99M0.1%+13.1%0.335%Search for SEC Filing on Google Icon
2/18/2026Engineers Gate Manager LP12,231$1.96M0.0%+212.5%0.018%Search for SEC Filing on Google Icon
2/18/2026Expect Equity LLC24,015$3.84M3.7%-23.7%0.036%Search for SEC Filing on Google Icon
2/18/2026Cinctive Capital Management LP31,897$5.10M0.3%N/A0.047%Search for SEC Filing on Google Icon
2/18/2026Concentric Capital Strategies LP102,590$16.39M0.8%+36.9%0.153%Search for SEC Filing on Google Icon
2/18/2026Balyasny Asset Management L.P.511,620$81.76M0.1%-39.8%0.762%Search for SEC Filing on Google Icon
2/17/2026Guggenheim Capital LLC9,812$1.57M0.0%+1.7%0.015%Search for SEC Filing on Google Icon
2/17/2026AQR Arbitrage LLC40,090$6.41M0.1%-65.8%0.060%Search for SEC Filing on Google Icon
2/17/2026Integrated Advisors Network LLC1,779$0.28M0.0%N/A0.003%Search for SEC Filing on Google Icon
2/17/2026AQR Capital Management LLC196,662$31.43M0.0%+15.7%0.293%Search for SEC Filing on Google Icon
2/17/2026Aequim Alternative Investments LP28,189$4.51M0.1%N/A0.042%Search for SEC Filing on Google Icon
2/17/2026Cetera Investment Advisers27,051$4.32M0.0%+2.1%0.040%Search for SEC Filing on Google Icon
2/17/2026Defiance ETFs LLC237,906$38.50M1.3%N/A0.354%Search for SEC Filing on Google Icon
2/17/2026Southpoint Capital Advisors LP600,000$95.88M2.2%N/A0.893%Search for SEC Filing on Google Icon
2/17/2026Jain Global LLC127,003$20.30M0.1%-4.7%0.189%Search for SEC Filing on Google Icon
2/17/2026Park West Asset Management LLC278,614$44.52M3.7%+364.4%0.415%Search for SEC Filing on Google Icon
2/17/2026Quantedge Capital Pte Ltd4,000$0.64M0.3%N/A0.006%Search for SEC Filing on Google Icon
2/17/2026Trexquant Investment LP9,159$1.46M0.0%+27.1%0.014%Search for SEC Filing on Google Icon
2/17/2026Price T Rowe Associates Inc. MD2,753,850$440.07M0.0%-24.2%4.100%Search for SEC Filing on Google Icon
2/17/2026Watershed Asset Management L.L.C.2,902$0.46M0.4%N/A0.004%Search for SEC Filing on Google Icon
2/17/2026Dean Investment Associates LLC23,480$3.75M0.5%+2.7%0.035%Search for SEC Filing on Google Icon
2/17/2026Osaic Holdings Inc.5,196$0.83M0.0%+2.2%0.008%Search for SEC Filing on Google Icon
2/17/2026Public Employees Retirement System of Ohio55,319$8.84M0.0%-11.2%0.082%Search for SEC Filing on Google Icon
2/17/2026Candelo Capital Management LP35,107$5.61M5.0%N/A0.052%Search for SEC Filing on Google Icon
2/17/2026California State Teachers Retirement System63,854$10.20M0.0%+2.6%0.095%Search for SEC Filing on Google Icon
2/17/2026Captrust Financial Advisors3,432$0.55M0.0%+26.8%0.005%Search for SEC Filing on Google Icon
2/17/2026Polar Capital Holdings Plc143,498$22.93M0.1%-0.8%0.214%Search for SEC Filing on Google Icon
2/17/2026Aster Capital Management DIFC Ltd561$90K0.0%-27.7%0.001%Search for SEC Filing on Google Icon
2/17/2026Delta Global Management LP327,390$52.32M2.4%+116.0%0.487%Search for SEC Filing on Google Icon
2/17/2026Blue Grotto Capital LLC415,500$66.40M6.8%+96.1%0.619%Search for SEC Filing on Google Icon
2/17/2026Needham Investment Management LLC130,500$20.85M1.3%-0.2%0.194%Search for SEC Filing on Google Icon
2/16/2026Squarepoint Ops LLC26,648$4.26M0.0%N/A0.040%Search for SEC Filing on Google Icon
2/16/2026Vanguard Personalized Indexing Management LLC18,476$2.95M0.0%+4.2%0.028%Search for SEC Filing on Google Icon
2/16/2026Verition Fund Management LLC3,590$0.57M0.0%-39.2%0.005%Search for SEC Filing on Google Icon
2/16/2026Panagora Asset Management Inc.1,450$0.23M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/16/2026Mariner LLC9,488$1.52M0.0%-1.2%0.014%Search for SEC Filing on Google Icon
2/16/2026NFJ Investment Group LLC85,590$13.68M0.5%-15.9%0.127%Search for SEC Filing on Google Icon
2/16/2026Focus Partners Wealth19,926$3.18M0.0%N/A0.030%Search for SEC Filing on Google Icon
2/16/2026Fieldview Capital Management LLC25,208$4.03M0.7%+3.5%0.038%Search for SEC Filing on Google Icon
2/16/2026Harber Asset Management LLC52,539$8.40M3.5%-23.1%0.078%Search for SEC Filing on Google Icon
2/16/2026Kennedy Capital Management LLC144,139$23.03M0.5%-16.0%0.215%Search for SEC Filing on Google Icon
2/16/2026Entropy Technologies LP6,991$1.12M0.1%N/A0.010%Search for SEC Filing on Google Icon
2/16/2026Arax Advisory Partners217$35K0.0%-88.1%0.000%Search for SEC Filing on Google Icon
2/16/2026Barclays PLC340,318$54.38M0.0%-7.3%0.507%Search for SEC Filing on Google Icon
2/16/2026Atlas Capital Advisors Inc.5,971$0.95M0.1%N/A0.009%Search for SEC Filing on Google Icon
2/13/2026Kestra Advisory Services LLC254$41K0.0%N/A0.000%Search for SEC Filing on Google Icon
2/13/2026The Manufacturers Life Insurance Company 606,214$96.88M0.1%-26.4%0.903%Search for SEC Filing on Google Icon
2/13/2026CANADA LIFE ASSURANCE Co38,169$6.10M0.0%-30.9%0.057%Search for SEC Filing on Google Icon
2/13/2026UMB Bank n.a.1,459$0.23M0.0%+53.4%0.002%Search for SEC Filing on Google Icon
2/13/2026Stifel Financial Corp58,696$9.38M0.0%+0.5%0.087%Search for SEC Filing on Google Icon
2/13/2026Neuberger Berman Group LLC1,461,189$233.50M0.2%-10.6%2.175%Search for SEC Filing on Google Icon
2/13/2026Smartleaf Asset Management LLC876$0.14M0.0%+236.9%0.001%Search for SEC Filing on Google Icon
2/13/2026Bank of Nova Scotia72,250$11.55M0.0%N/A0.108%Search for SEC Filing on Google Icon
2/13/2026First Trust Advisors LP52,976$8.47M0.0%-54.5%0.079%Search for SEC Filing on Google Icon
2/13/2026Channing Capital Management LLC531,179$84.88M2.2%-28.6%0.791%Search for SEC Filing on Google Icon
2/13/2026Headlands Technologies LLC2,676$0.43M0.0%N/A0.004%Search for SEC Filing on Google Icon
2/13/2026FirstWave Capital Management LLC8,021$1.28M0.8%N/A0.012%Search for SEC Filing on Google Icon
2/13/2026Charles Schwab Investment Management Inc.870,654$139.13M0.0%+2.9%1.296%Search for SEC Filing on Google Icon
2/13/2026Police & Firemen s Retirement System of New Jersey28,116$4.49M0.0%-5.5%0.042%Search for SEC Filing on Google Icon
2/13/2026Victory Capital Management Inc.2,562,399$409.47M0.2%-28.5%3.815%Search for SEC Filing on Google Icon
2/13/2026Ieq Capital LLC11,907$1.90M0.0%-38.2%0.018%Search for SEC Filing on Google Icon
2/13/2026First National Bank of Omaha12,475$1.99M0.1%-7.4%0.019%Search for SEC Filing on Google Icon
2/13/2026Dynamic Technology Lab Private Ltd6,338$1.01M0.2%+93.8%0.009%Search for SEC Filing on Google Icon
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC200,179$31.99M0.0%-3.0%0.298%Search for SEC Filing on Google Icon
2/13/2026Banco Santander S.A.11,748$1.88M0.0%+2.2%0.017%Search for SEC Filing on Google Icon
2/13/2026Quadrant Capital Group LLC4,335$0.69M0.0%+1.3%0.006%Search for SEC Filing on Google Icon
2/12/2026Hollencrest Capital Management1,426$0.23M0.0%N/A0.002%Search for SEC Filing on Google Icon
2/12/2026Front Row Advisors LLC7,910$1.26M0.4%+1.6%0.012%Search for SEC Filing on Google Icon
2/12/2026Federation des caisses Desjardins du Quebec4,882$0.78M0.0%+17.2%0.007%Search for SEC Filing on Google Icon
2/12/2026Leith Wheeler Investment Counsel Ltd.48,469$7.75M0.6%-27.8%0.072%Search for SEC Filing on Google Icon
2/12/2026HRT Financial LP4,169$0.67M0.0%-98.4%0.006%Search for SEC Filing on Google Icon
2/12/2026Brooklyn Investment Group7,399$1.20M0.1%+45.7%0.011%Search for SEC Filing on Google Icon
2/12/2026Orion Porfolio Solutions LLC16,358$2.61M0.0%-5.8%0.024%Search for SEC Filing on Google Icon
2/12/2026MetLife Investment Management LLC32,820$5.25M0.0%-4.9%0.049%Search for SEC Filing on Google Icon
2/12/2026Index Technologies Group LLC1,748$0.28M0.3%N/A0.003%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: $227.13
Low: $222.10
High: $237.95

50 Day Range

MA: $231.43
Low: $185.92
High: $262.94

52 Week Range

Now: $227.13
Low: $54.84
High: $269.91

Volume

1,882,516 shs

Average Volume

1,399,826 shs

Market Capitalization

$15.27 billion

P/E Ratio

51.97

Dividend Yield

0.42%

Beta

1.94

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

MKS's top insider investors include:
  1. John Tseng-Chung Lee (CEO)
  2. Gerard G Colella (Director)
  3. Kathleen Flaherty Burke (EVP)
  4. Gerald G Colella (Director)
  5. David Philip Henry (EVP)
  6. Eric Robert Taranto (EVP)
  7. Elizabeth Mora (Director)
  8. Jacqueline F Moloney (Director)
  9. Peter Cannone III (Director)
  10. John Edward Williams (EVP)
  11. Michelle M Mccarthy (CAO)
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. Capital International Investors — 4.82%
  3. Price T Rowe Associates Inc. MD — 4.10%
  4. Victory Capital Management Inc. — 3.81%
  5. Neuberger Berman Group LLC — 2.18%
  6. Geode Capital Management LLC — 1.87%
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. Victory Capital Management Inc.
  2. Nordea Investment Management AB
  3. Price T Rowe Associates Inc. MD
  4. Cooke & Bieler LP
  5. Balyasny Asset Management L.P.
  6. Vanguard Group Inc.
  7. HRT Financial LP
  8. Mizuho Markets Americas LLC
Within the previous year, company insiders that have sold MKS company stock include:
  1. John Tseng-Chung Lee (CEO)
  2. Gerard G Colella (Director)
  3. Kathleen Flaherty Burke (EVP)
  4. Gerald G Colella (Director)
  5. David Philip Henry (EVP)
  6. Eric Robert Taranto (EVP)
  7. Elizabeth Mora (Director)
  8. Jacqueline F Moloney (Director)
  9. Peter Cannone III (Director)
  10. John Edward Williams (EVP)
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. Norges Bank
  2. Southpoint Capital Advisors LP
  3. Westfield Capital Management Co. LP
  4. Millennium Management LLC
  5. Defiance ETFs LLC
  6. Park West Asset Management LLC
  7. Blue Grotto Capital LLC
  8. Delta Global Management LP