MKS Inc.
US ˙ NasdaqGS ˙ US55306N1046

SecurityMKSI / MKS Inc.
InstitutionAxa S.a.
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Axa S.a. closes position in MKSI / MKS Inc.

On November 14, 2025 - Axa S.a. filed a 13F-HR form disclosing ownership of 0 shares of MKS Inc. (US:MKSI) valued at $0 USD as of September 30, 2025. The entity filed a previous 13F-HR on August 14, 2025 disclosing 29,253 shares of MKS Inc.. The current value of the position is $0 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2025-11-14 2025-09-30 13F MKS COM 55306N104 0 -100.00 0
2025-08-14 2025-06-30 13F MKS COM 55306N104 29,253 5,430 22.79 2,907 52.23 0.0083
2025-05-15 2025-03-31 13F MKS INSTRS COM 55306N104 23,823 -9,456 -28.41 1,909 -45.03 0.0063
2025-02-14 2024-12-31 13F MKS INSTRS COM 55306N104 33,279 19,521 141.89 3,474 132.31 0.0106
2024-11-14 2024-09-30 13F MKS INSTRS COM 55306N104 13,758 4,259 44.84 1,496 20.56 0.0044
2025-02-25 2024-06-30 13F/A-1 MKS INSTRS COM 55306N104 9,499 0 0.00 1,240 -1.82 0.0037
2024-08-14 2024-06-30 13F MKS INSTRS COM 55306N104 9,499 0 1,240 0.0037
2024-05-15 2024-03-31 13F MKS INSTRS COM 55306N104 9,499 -7,974 -45.64 1,263 -29.72 0.0038
2024-07-16 2023-12-31 13F/A-1 MKS INSTRS COM 55306N104 17,473 17,473 1,797 0.0058
2024-02-14 2023-12-31 13F MKS INSTRS COM 55306N104 17,473 17,473 1,797 0.0035
2021-11-13 2021-09-30 13F MKS Instruments COM 55306N104 0 -31,500 -100.00 0 -100.00
2021-08-13 2021-06-30 13F/A-1 MKS Instruments COM 55306N104 31,500 -22,900 -42.10 5,605 -44.43 0.0158
2021-08-13 2021-06-30 13F MKS Instruments COM 55306N104 31,500 -22,900 5,605 0.0095
2021-05-14 2021-03-31 13F MKS Instruments COM 55306N104 54,400 -55,300 -50.41 10,087 -38.88 0.0307
2021-02-12 2020-12-31 13F MKS Instruments COM 55306N104 109,700 -10,100 -8.43 16,504 26.12 0.0518
2021-02-11 2020-09-30 13F/A-1 MKS Instruments COM 55306N104 119,800 119,800 13,086 0.0473
2020-11-13 2020-09-30 13F MKS Instruments COM 55306N104 119,800 119,800 13,086 26,121.7329
2019-05-14 2019-03-31 13F MKS INSTRUMENT COM 55306N104 0 -14,000 -100.00 0 -100.00
2019-02-13 2018-12-31 13F MKS INSTRUMENT COM 55306N104 14,000 -136,023 -90.67 905 -92.47 0.0039
2018-11-08 2018-09-30 13F MKS INSTRUMENT COM 55306N104 150,023 -24,134 -13.86 12,024 -27.85 0.0441
2018-08-13 2018-06-30 13F MKS INSTRUMENT COM 55306N104 174,157 -17,966 -9.35 16,666 -24.99 0.0639
2018-05-14 2018-03-31 13F MKS INSTRUMENT COM 55306N104 192,123 -30,977 -13.88 22,219 5.39 0.0887
2018-02-13 2017-12-31 13F MKS INSTRUMENT COM 55306N104 223,100 44,500 24.92 21,083 24.98 0.0828
2017-12-01 2017-09-30 13F/A-1 MKS INSTRUMENT COM 55306N104 178,600 38,900 27.85 16,869 79.42 0.0727
2017-11-13 2017-09-30 13F MKS INSTRUMENT COM 55306N104 178,600 38,900 16,869
2017-08-10 2017-06-30 13F MKS INSTRUMENT COM 55306N104 139,700 139,700 9,402 0.0427
2015-02-13 2014-12-31 13F MKS INSTRUMENTS COM 55306N104 0 -29,300 -100.00 0 -100.00
2014-11-13 2014-09-30 13F MKS INSTRUMENTS COM 55306N104 29,300 29,300 978 0.0042
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.