MKS Inc.
DE ˙ DB ˙ US55306N1046
279,60 € ↓ -5,10 (-1,79%)
2026-06-05
DEL PRIS
SecurityDE:MKT / MKS Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Sei Investments Co closes position in MKT / MKS Inc.

On May 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 0 shares of MKS Inc. (DE:MKT) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 126,058 shares of MKS Inc.. This represents a change in shares of -100.00% during the quarter. 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)
2026-05-13 2026-03-31 13F MKS COM 55306N104 0 -126,058 -100.00 0 -100.00
2026-02-13 2025-12-31 13F MKS COM 55306N104 126,058 13,888 12.38 20,145 45.10 0.0199
2025-11-13 2025-09-30 13F MKS COM 55306N104 112,170 2,820 2.58 13,884 27.78 0.0149
2025-08-14 2025-06-30 13F MKS COM 55306N104 109,350 -35,753 -24.64 10,866 -6.57 0.0126
2025-05-14 2025-03-31 13F/A-1 MKS INSTRS COM 55306N104 145,103 -5,922 -3.92 11,629 -26.24 0.0150
2025-05-13 2025-03-31 13F MKS INSTRS COM 55306N104 148,065 -2,960 13,323 0.0145
2025-02-11 2024-12-31 13F MKS INSTRS COM 55306N104 151,025 36,721 32.13 15,766 26.88 0.0202
2024-11-12 2024-09-30 13F MKS INSTRS COM 55306N104 114,304 68,153 147.67 12,426 106.19 0.0161
2024-08-13 2024-06-30 13F MKS INSTRS COM 55306N104 46,151 877 1.94 6,027 0.08 0.0085
2024-05-07 2024-03-31 13F MKS INSTRS COM 55306N104 45,274 -3,124 -6.45 6,022 20.95 0.0088
2024-02-14 2023-12-31 13F MKS INSTRS COM 55306N104 48,398 -5,422 -10.07 4,979 6.89 0.0080
2023-11-14 2023-09-30 13F MKS INSTRS COM 55306N104 53,820 942 1.78 4,658 -18.53 0.0084
2023-08-11 2023-06-30 13F MKS INSTRS COM 55306N104 52,878 -5,413 -9.29 5,716 10.67 0.0100
2023-05-12 2023-03-31 13F MKS INSTRS COM 55306N104 58,291 -1,555 -2.60 5,166 1.87 0.0096
2023-02-10 2022-12-31 13F MKS INSTRS COM 55306N104 59,846 25,707 75.30 5,071 79.72 0.0113
2022-11-14 2022-09-30 13F MKS INSTRS COM 55306N104 34,139 -37,307 -52.22 2,821 -61.55 0.0063
2022-08-15 2022-06-30 13F MKS INSTRS COM 55306N104 71,446 16,546 30.14 7,337 -10.92 0.0158
2022-05-13 2022-03-31 13F MKS INSTRS COM 55306N104 54,900 -11,463 -17.27 8,236 -28.81 0.0166
2022-02-14 2021-12-31 13F MKS INSTRS COM 55306N104 66,363 3,273 5.19 11,569 21.40 0.0217
2021-11-12 2021-09-30 13F MKS INSTRS COM 55306N104 63,090 5,535 9.62 9,530 -6.96 0.0200
2021-08-06 2021-06-30 13F MKS INSTRS COM 55306N104 57,555 -5,157 -8.22 10,243 -10.00 0.0227
2021-05-12 2021-03-31 13F MKS INSTRS COM 55306N104 62,712 -13,677 -17.90 11,381 -1.06 0.0287
2021-02-08 2020-12-31 13F MKS INSTRS COM 55306N104 76,389 -677 -0.88 11,503 36.66 0.0297
2020-12-04 2020-09-30 13F/A-1 MKS INSTRS COM 55306N104 77,066 -14,508 -15.84 8,417 -18.63 0.0244
2020-11-06 2020-09-30 13F MKS INSTRS COM 55306N104 82,454 -9,120 9,006 21,684.4456
2020-08-17 2020-06-30 13F/A-1 MKS INSTRS COM 55306N104 91,574 7,112 8.42 10,344 50.37 0.0321
2020-08-11 2020-06-30 13F MKS INSTRS COM 55306N104 95,828 11,366 10,550 28,617.4366
2020-05-14 2020-03-31 13F MKS INSTRS COM 55306N104 84,462 -6,065 -6.70 6,879 -30.93 0.0253
2020-02-06 2019-12-31 13F MKS INSTRUMENT COM 55306N104 90,527 14,812 19.56 9,959 42.54 0.0297
2019-11-12 2019-09-30 13F MKS INSTRUMENT COM 55306N104 75,715 -15,237 -16.75 6,987 -1.37 0.0179
2019-08-14 2019-06-30 13F MKS INSTRUMENT COM 55306N104 90,952 -3,132 -3.33 7,084 -19.08 0.0231
2019-05-15 2019-03-31 13F MKS INSTRUMENT COM 55306N104 94,084 5,240 5.90 8,754 22.93 0.0294
2019-02-13 2018-12-31 13F MKS INSTRUMENT COM 55306N104 88,844 -1,309 -1.45 7,121 -1.23 0.0254
2018-11-08 2018-09-30 13F MKS INSTRUMENT COM 55306N104 90,153 -1,788 -1.94 7,210 -18.05 0.0261
2018-08-03 2018-06-30 13F MKS INSTRUMENT COM 55306N104 91,941 40,783 79.72 8,798 48.69 0.0299
2018-05-11 2018-03-31 13F MKS INSTRUMENT COM 55306N104 51,158 -512 -0.99 5,917 21.18 0.0227
2018-02-08 2017-12-31 13F MKS INSTRUMENT COM 55306N104 51,670 -1,388 -2.62 4,883 -2.55 0.0170
2017-11-06 2017-09-30 13F MKS INSTRUMENT COM 55306N104 53,058 49,055 1,225.46 5,011 1,762.83 0.0178
2017-07-31 2017-06-30 13F MKS INSTRUMENT COM 55306N104 4,003 313 8.48 269 5.91 0.0011
2017-05-05 2017-03-31 13F MKS INSTRUMENT COM 55306N104 3,690 9 0.24 254 15.98 0.0011
2017-02-02 2016-12-31 13F MKS INSTRUMENT COM 55306N104 3,681 6 0.16 219 20.33 0.0011
2016-11-04 2016-09-30 13F MKS INSTRUMENT COM 55306N104 3,675 2,137 138.95 182 171.64 0.0009
2016-08-11 2016-06-30 13F MKS INSTRUMENT COM 55306N104 1,538 940 157.19 67 191.30 0.0004
2016-05-10 2016-03-31 13F/A-1 MKS INSTRUMENT COM 55306N104 598 125 26.43 23 35.29 0.0001
2016-02-03 2015-12-31 13F MKS INSTRUMENT COM 55306N104 473 75 18.84 17 21.43 0.0001
2015-11-02 2015-09-30 13F/A-1 MKS INSTRUMENT COM 55306N104 398 0 0.00 14 -6.67 0.0001
2015-10-30 2015-09-30 13F DIREXION SHS ETF TR COM 55306N104 398 14
2015-08-07 2015-06-30 13F/A-1 MKS INSTRUMENT COM 55306N104 398 -6,485 -94.22 15 -93.56 0.0001
2015-08-04 2015-06-30 13F MKS INSTRUMENT COM 55306N104 398 -6,485 15 0.0001
2015-05-14 2015-03-31 13F/A-1 MKS INSTRUMENT COM 55306N104 6,883 -4,542 -39.75 233 -44.26 0.0020
2015-05-01 2015-03-31 13F MKS INSTRUMENT COM 55306N104 6,883 233
2015-02-10 2014-12-31 13F MKS INSTRUMENT COM 55306N104 11,425 11,425 418 0.0037
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.