MKS Inc.
US ˙ NasdaqGS ˙ US55306N1046

SecurityMKSI / MKS Inc.
InstitutionEllevest, Inc.
Latest Disclosed Ownership4,794 shares
Latest Disclosed Value $ 1,101,709
Ellevest, Inc. reports 7.49% decrease in ownership of MKSI / MKS Inc.

On May 11, 2026 - Ellevest, Inc. filed a 13F-HR form disclosing ownership of 4,794 shares of MKS Inc. (US:MKSI) valued at $1,101,709 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 5,182 shares of MKS Inc.. This represents a change in shares of -7.49% during the quarter. The current value of the position is $1,606,709 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-11 2026-03-31 13F MKS INC. COM COM 55306N104 4,794 -388 -7.49 1,102 32.97 0.1532
2026-02-10 2025-12-31 13F MKS INC. COM COM 55306N104 5,182 404 8.46 828 40.10 0.1145
2025-11-14 2025-09-30 13F MKS COM 55306N104 4,778 -4,715 -49.67 591 -37.33 0.0845
2025-08-05 2025-06-30 13F MKS COM 55306N104 9,493 -68 -0.71 943 23.11 0.1505
2025-05-14 2025-03-31 13F MKS INSTRS COM 55306N104 9,561 928 10.75 766 -14.98 0.0511
2025-02-14 2024-12-31 13F MKS INSTRS COM 55306N104 8,633 585 7.27 901 3.09 0.0520
2024-11-13 2024-09-30 13F MKS INSTRS COM 55306N104 8,048 1,854 29.93 875 8.17 0.0484
2024-08-14 2024-06-30 13F MKS INSTRS COM 55306N104 6,194 473 8.27 809 6.32 0.0485
2024-05-13 2024-03-31 13F MKS INSTRS COM 55306N104 5,721 284 5.22 761 35.96 0.0472
2024-02-06 2023-12-31 13F MKS INSTRS COM 55306N104 5,437 -143 -2.56 559 15.98 0.0381
2023-11-09 2023-09-30 13F MKS INSTRS COM 55306N104 5,580 -63 -1.12 483 -20.98 0.0371
2023-08-09 2023-06-30 13F MKS INSTRS COM 55306N104 5,643 569 11.21 610 35.86 0.0459
2023-05-04 2023-03-31 13F MKS INSTRS INC COM Stock 55306N104 5,074 706 16.16 450 21.35 0.0349
2023-02-03 2022-12-31 13F MKS INSTRS INC COM Stock 55306N104 4,368 1,755 67.16 370 71.30 0.0312
2022-11-02 2022-09-30 13F MKS INSTRS INC COM Stock 55306N104 2,613 519 24.79 216 0.47 0.0205
2022-07-18 2022-06-30 13F MKS INSTRS INC COM Stock 55306N104 2,094 584 38.68 215 -5.29 0.0202
2022-04-19 2022-03-31 13F MKS INSTRS Stock 55306N104 1,510 689 83.92 227 58.74 0.0192
2022-01-24 2021-12-31 13F MKS INSTRS INC COM Stock 55306N104 821 754 1,125.37 143 1,330.00 0.0127
2021-10-19 2021-09-30 13F MKS INSTRS INC COM Stock 55306N104 67 -18 -21.18 10 -33.33 0.0010
2021-07-13 2021-06-30 13F MKS INSTRS INC COM Stock 55306N104 85 0 0.00 15 -6.25 0.0015
2021-05-03 2021-03-31 13F MKS INSTRS INC COM Stock 55306N104 85 -32 -27.35 16 -11.11 0.0019
2021-02-04 2020-12-31 13F MKS INSTRS INC COM Stock 55306N104 117 -1,175 -90.94 18 -87.23 0.0026
2020-10-26 2020-09-30 13F MKS INSTRS INC COM Stock 55306N104 1,292 147 12.84 141 8.46 0.0253
2020-07-06 2020-06-30 13F MKS INSTRUMENT Stock 55306N104 1,145 460 67.15 130 132.14 0.0278
2020-04-13 2020-03-31 13F MKS INSTRS INC COM Stock 55306N104 685 382 126.07 56 69.70 0.0155
2020-02-05 2019-12-31 13F MKS INSTRUMENT INC COM Stock 55306N104 303 303 33 0.0092
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.