MKS INC. MKSI
COM · Common Stock · CUSIP 55306N104 · ISIN US55306N1046
Company in Andover, United States
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($3.0m this quarter). Holder counts are more reliable. Shares outstanding: 67.1m as of 2025-04-29, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $80.10. Options: 13 managers hold calls ($155.0m notional), 11 hold puts ($16.4m).
Trends to Q1 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 357 |
| Q4 2022 | 316 |
| Q1 2023 | 325 |
| Q2 2023 | 321 |
| Q3 2023 | 324 |
| Q4 2023 | 325 |
| Q1 2024 | 343 |
| Q2 2024 | 397 |
| Q3 2024 | 410 |
| Q4 2024 | 419 |
| Q1 2025 | 399 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q2 2023 | 161 | 156 |
| Q3 2023 | 168 | 135 |
| Q4 2023 | 153 | 164 |
| Q1 2024 | 177 | 142 |
| Q2 2024 | 223 | 148 |
| Q3 2024 | 244 | 163 |
| Q4 2024 | 215 | 181 |
| Q1 2025 | 223 | 197 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q2 2024 | $241.7m | $25.3m | 0.10 |
| Q3 2024 | $208.4m | $21.0m | 0.10 |
| Q4 2024 | $196.5m | $16.0m | 0.08 |
| Q1 2025 | $155.0m | $16.4m | 0.11 |
Biggest buyers
| WELLINGTON MANAGEMENT GROUP LLP | Added | +958.6k |
| Channing Capital Management, LLC | New | +553.0k |
| Madison Asset Management, LLC | Added | +494.2k |
| Kodai Capital Management LP | Added | +410.9k |
| Balyasny Asset Management L.P. | Added | +394.8k |
| MILLENNIUM MANAGEMENT LLC | Added | +310.3k |
| VICTORY CAPITAL MANAGEMENT INC | Added | +300.4k |
| Blue Grotto Capital, LLC | Added | +269.2k |
| DIMENSIONAL FUND ADVISORS LP | Added | +252.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +173.9k |
Biggest sellers
| GOLDMAN SACHS GROUP INC | Reduced | -749.7k |
| Ceredex Value Advisors LLC | Sold out | -453.1k |
| Fisher Asset Management, LLC | Reduced | -354.8k |
| Assenagon Asset Management S.A. | Sold out | -300.7k |
| NORDEA INVESTMENT MANAGEMENT AB | Reduced | -251.8k |
| Amundi | Reduced | -199.5k |
| Invesco Ltd. | Reduced | -181.9k |
| FMR LLC | Reduced | -176.7k |
| BARCLAYS PLC | Reduced | -142.1k |
| GREAT LAKES ADVISORS, LLC | Reduced | -135.3k |
Biggest calls
| UBS Group AG | Unchanged | $72.7m907.2k shares |
| JANE STREET GROUP, LLC | Reduced | $41.9m523.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $12.6m156.8k shares |
| WOLVERINE TRADING, LLC | Added | $10.1m123.7k shares |
| CITADEL ADVISORS LLC | Added | $7.4m92.9k shares |
| Caption Management, LLC | Unchanged | $5.2m65.0k shares |
| PEAK6 LLC | Reduced | $3.0m37.4k shares |
| Walleye Trading LLC | Reduced | $488.9k6.1k shares |
| SIMPLEX TRADING, LLC | Added | $432.0k5.4k shares |
| TUDOR INVESTMENT CORP ET AL | New | $376.7k4.7k shares |
Biggest puts
| WOLVERINE TRADING, LLC | Added | $5.2m63.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $4.4m55.5k shares |
| CITADEL ADVISORS LLC | Added | $2.3m29.3k shares |
| PEAK6 LLC | Added | $2.3m28.6k shares |
| SIMPLEX TRADING, LLC | Added | $937.0k11.7k shares |
| Walleye Trading LLC | Added | $649.2k8.1k shares |
| JANE STREET GROUP, LLC | Added | $288.5k3.6k shares |
| Walleye Capital LLC | New | $144.3k1.8k shares |
| GROUP ONE TRADING LLC | New | $80.2k1.0k shares |
| Quaker Wealth Management, LLC | First filing | $811 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2025-10-17 | 8.8% |
| Invesco Ltd. 13G · institution new · filed 2026-02-12 | 6.5% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.5% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 | 5.2% |
Fell to 5% or below in the last year: JPMORGAN CHASE & CO (2.9%, 2026-09-03), VICTORY CAPITAL MANAGEMENT INC (90.0%, 2026-07-24), FMR LLC (3.3%, 2026-05-06), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC), PRICE T ROWE ASSOCIATES INC /MD/ (4.1%, 2026-02-17)
Insider purchases and sales in Q1 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q2 2023 | 0 | — | 2 | $41.3k | $41.3k |
| Q3 2023 | 0 | — | 5 | $4.7m | $1.0m |
| Q4 2023 | 1 | $170.8k | 2 | $42.3k | $42.3k |
| Q1 2024 | 0 | — | 5 | $7.6m | $2.4m |
| Q2 2024 | 0 | — | 1 | $68.8k | $68.8k |
| Q3 2024 | 0 | — | 3 | $276.4k | $62.8k |
| Q4 2024 | 0 | — | 2 | $92.9k | $92.9k |
| Q1 2025 | 0 | — | 3 | $889.4k | $53.2k |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-03-03 | Moloney Jacqueline F Director | Sold plan | $27.7k300 shares |
| 2025-03-03 | Mora Elizabeth Director | Sold plan | $25.4k275 shares |
| 2025-02-18 | COLELLA GERARD G Director · By The Gerald G. Colella 2019 Trust | Sold | $836.2k8.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q1 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.01% of their portfolio | 7.5m $597.2m | Added +4.7k |
| BlackRock, Inc. 0.01% of their portfolio | 7.1m $566.4m | Reduced -53.2k |
| FMR LLC 0.02% of their portfolio | 4.0m $324.2m | Reduced -176.7k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.03% of their portfolio | 3.5m $281.8m | Added +173.9k |
| VICTORY CAPITAL MANAGEMENT INC 0.28% of their portfolio | 3.4m $271.6m | Added +300.4k |
| WELLINGTON MANAGEMENT GROUP LLP 0.05% of their portfolio | 3.3m $260.5m | Added +958.6k |
| Capital International Investors 0.05% of their portfolio | 3.1m $248.4m | Added +1.3k |
| NORDEA INVESTMENT MANAGEMENT AB 0.19% of their portfolio | 2.3m $178.6m | Reduced -251.8k |
| STATE STREET CORP 0.01% of their portfolio | 2.1m $166.9m | Added +13.1k |
| Invesco Ltd. 0.03% of their portfolio | 2.0m $164.3m | Reduced -181.9k |
| NEUBERGER BERMAN GROUP LLC 0.13% of their portfolio | 1.9m $155.8m | Added +159.8k |
| Madison Asset Management, LLC 1.28% of their portfolio | 1.4m $114.5m | Added +494.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 1.2m $98.1m | Added +48.8k |
| COOKE & BIELER LP 0.83% of their portfolio | 1.0m $83.3m | Added +161.9k |
| NORGES BANK 0.01% of their portfolio | 904.5k $72.5m | Added +85.9k |
| DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio | 878.7k $70.4m | Added +252.5k |
| PRINCIPAL FINANCIAL GROUP INC 0.04% of their portfolio | 835.2k $66.9m | Reduced -1.2k |
| UBS Group AG 0.01% of their portfolio | 807.9k $64.7m | Added +134.9k |
| ROYCE & ASSOCIATES LP 0.69% of their portfolio | 793.2k $63.6m | Added +53.8k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 718.2k $57.6m | Added +51.8k |
| BARCLAYS PLC 0.03% of their portfolio | 710.9k $57.0m | Reduced -142.1k |
| Kodai Capital Management LP 2.25% of their portfolio | 708.0k $56.7m | Added +410.9k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 681.4k $54.6m | Reduced -25.6k |
| MORGAN STANLEY 0.00% of their portfolio | 642.8k $51.5m | Added +18.8k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 634.2k $50.8m | Added +25.8k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 603.7k $48.4m | Reduced -8.0k |
| SHAPIRO CAPITAL MANAGEMENT LLC 1.83% of their portfolio | 553.4k $44.4m | Added +91.4k |
| Channing Capital Management, LLC 1.34% of their portfolio | 553.0k $44.3m | New |
| MILLENNIUM MANAGEMENT LLC 0.04% of their portfolio | 545.1k $43.7m | Added +310.3k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.04% of their portfolio | 543.4k $43.6m | Added +51.9k |
| Rafferty Asset Management, LLC 0.18% of their portfolio | 537.5k $43.1m | Reduced -39.1k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 524.8k $42.1m | Added +115.5k |
| Balyasny Asset Management L.P. 0.10% of their portfolio | 494.6k $39.6m | Added +394.8k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 454.1k $36.4m | Added +1.9k |
| NOMURA HOLDINGS INC 0.17% of their portfolio | 400.2k $32.1m | Reduced -19.1k |
| WELLS FARGO & COMPANY/MN 0.01% of their portfolio | 399.1k $32.0m | Added +24.3k |
| D. E. Shaw & Co., Inc. 0.04% of their portfolio | 392.4k $31.4m | Added +24.9k |
| Capital Research Global Investors 0.01% of their portfolio | 387.2k $31.0m | Unchanged |
| CITIGROUP INC 0.02% of their portfolio | 385.5k $30.9m | Reduced -97.6k |
| Polaris Capital Management, LLC 1.71% of their portfolio | 373.6k $29.9m | Added +21.2k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.32% of their portfolio | 370.3k $29.7m | Added +6.9k |
| Point72 Asset Management, L.P. 0.08% of their portfolio | 359.9k $28.8m | Added +38.3k |
| Blue Grotto Capital, LLC 5.44% of their portfolio | 355.2k $28.5m | Added +269.2k |
| VALUE HOLDINGS MANAGEMENT CO. LLC 4.47% of their portfolio | 297.7k $23.9m | Unchanged |
| MIZUHO MARKETS AMERICAS LLC 0.49% of their portfolio | 283.7k $22.7m | Reduced -1.1k |
| LOOMIS SAYLES & CO L P 0.03% of their portfolio | 282.6k $22.6m | Reduced -5.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 267.4k $21.4m | Added +9.2k |
| NATIXIS ADVISORS, LLC 0.04% of their portfolio | 264.1k $21.2m | Reduced -19.1k |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 262.6k $21.0m | Reduced -8.7k |
| Harvey Partners, LLC 2.48% of their portfolio | 261.0k $20.9m | Added +71.5k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.15% of their portfolio | 259.3k $20.8m | Reduced -506 |
| California Public Employees Retirement System 0.01% of their portfolio | 259.0k $20.8m | Added +153.7k |
| Artemis Investment Management LLP 0.31% of their portfolio | 251.8k $20.2m | Added +5.4k |
| BANK OF MONTREAL /CAN/ 0.01% of their portfolio | 233.7k $18.7m | Added +53.9k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 233.0k $18.7m | Reduced -749.7k |
| Thrivent Financial for Lutherans 0.04% of their portfolio | 224.9k $18.0m | Added +20.7k |
| SYSTEMATIC FINANCIAL MANAGEMENT LP 0.51% of their portfolio | 222.2k $17.8m | Added +2.6k |
| Aperture Investors, LLC 2.50% of their portfolio | 205.2k $16.4m | Reduced -25.8k |
| KENNEDY CAPITAL MANAGEMENT LLC 0.36% of their portfolio | 188.8k $15.1m | Added +114.2k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 187.8k $15.1m | Added +1.5k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 166.4k $13.3m | Added +108.7k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 164.6k $13.2m | First filing |
| Retirement Systems of Alabama 0.05% of their portfolio | 158.0k $12.7m | Added +81 |
| Polar Capital Holdings Plc 0.08% of their portfolio | 156.5k $12.5m | Unchanged |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 155.1k $12.4m | Reduced -35.0k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 145.1k $11.6m | Reduced -5.9k |
| Penserra Capital Management LLC 0.21% of their portfolio | 144.0k $11.5m | Added +41.9k |
| Nuveen, LLC 0.00% of their portfolio | 137.1k $11.0m | First filing |
| BESSEMER GROUP INC 0.02% of their portfolio | 134.1k $10.7m | Reduced -12.7k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 132.6k $10.6m | Added +1.6k |
| SummitTX Capital, L.P. 0.47% of their portfolio | 132.3k $10.6m | First filing |
| Swiss National Bank 0.01% of their portfolio | 130.4k $10.5m | Reduced -1.9k |
| NEEDHAM INVESTMENT MANAGEMENT LLC 0.97% of their portfolio | 128.8k $10.3m | Reduced -250 |
| Freestone Grove Partners LP 0.10% of their portfolio | 123.4k $9.9m | New |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 110.8k $8.9m | Added +15.5k |
| HARBOR CAPITAL ADVISORS, INC. 0.40% of their portfolio | 109.8k $8.8m | Reduced -5.8k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 105.3k $8.4m | Added +86.4k |
| Legal & General Group Plc 0.00% of their portfolio | 105.2k $8.4m | Added +538 |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 103.1k $8.3m | Reduced -78.5k |
| SEGALL BRYANT & HAMILL, LLC 0.11% of their portfolio | 92.8k $7.4m | Added +2.7k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 87.2k $7.0m | Reduced -1.3k |
| First Eagle Investment Management, LLC 0.01% of their portfolio | 86.6k $6.9m | Reduced -47.6k |
| FEDERATED HERMES, INC. 0.01% of their portfolio | 83.8k $6.7m | Added +53.5k |
| STIFEL FINANCIAL CORP 0.01% of their portfolio | 83.2k $6.7m | Added +21.2k |
| Harber Asset Management LLC 2.34% of their portfolio | 82.1k $6.6m | New |
| LAZARD ASSET MANAGEMENT LLC 0.01% of their portfolio | 81.6k $6.5m | Added +20.1k |
| Jain Global LLC 0.13% of their portfolio | 80.6k $6.5m | Added +60.6k |
| Amundi 0.00% of their portfolio | 79.5k $5.1m | Reduced -199.5k |
| MACQUARIE GROUP LTD 0.01% of their portfolio | 76.7k $6.2m | Added +15.4k |
| Corebridge Financial, Inc. 0.03% of their portfolio | 74.4k $6.0m | Reduced -1.8k |
| Leith Wheeler Investment Counsel Ltd. 0.41% of their portfolio | 73.2k $5.9m | Added +891 |
| FIRST NATIONAL BANK OF OMAHA 0.39% of their portfolio | 71.0k $5.7m | Reduced -2.6k |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 70.2k $5.5m | Added +11.4k |
| Trexquant Investment LP 0.06% of their portfolio | 66.0k $5.3m | Added +51.5k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 65.4k $5.2m | Added +100 |
| Walleye Capital LLC 0.06% of their portfolio | 63.6k $5.1m | Reduced -49.0k |
| Sculptor Capital LP 0.11% of their portfolio | 63.3k $5.1m | New |
| READYSTATE ASSET MANAGEMENT LP 0.25% of their portfolio | 63.2k $5.1m | Added +22.5k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 62.2k $5.0m | Reduced -711 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO 0.02% of their portfolio | 61.3k $4.9m | Added +21.9k |