MKS Inc.
US ˙ NasdaqGS ˙ US55306N1046

SecurityMKSI / MKS Inc.
InstitutionWhittier Trust Co
Latest Disclosed Ownership977 shares
Latest Disclosed Value $ 231,529
Whittier Trust Co ownership in MKSI / MKS Inc.

On April 28, 2026 - Whittier Trust Co filed a 13F-HR form disclosing ownership of 977 shares of MKS Inc. (US:MKSI) valued at $224,524 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 977 shares of MKS Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $327,442 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)
2026-04-28 2026-03-31 13F MKS INSTRUMENT common 55306N104 977 0 0.00 232 29.05 0.0026
2026-01-26 2025-12-31 13F MKS INSTRUMENT common 55306N104 977 0 0.00 179 33.58 0.0019
2025-10-31 2025-09-30 13F MKS common 55306N104 977 0 0.00 135 38.14 0.0015
2025-07-30 2025-06-30 13F MKS INC. COM US LARGE-CAP EQUITIES 55306N104 977 0 0.00 97 24.36 0.0012
2025-05-02 2025-03-31 13F MKS INSTRS INC COM US LARGE-CAP EQUITIES 55306N104 977 0 0.00 78 -22.77 0.0011
2025-02-11 2024-12-31 13F MKS INSTRS INC COM US LARGE-CAP EQUITIES 55306N104 977 977 102 0.0013
2022-07-28 2022-06-30 13F MKS INSTRS INC COM US LARGE-CAP EQUITIES 55306N104 0 -22 -100.00 0 -100.00
2022-04-29 2022-03-31 13F MKS INSTRS INC COM US LARGE-CAP EQUITIES 55306N104 22 22 3 0.0001
2020-07-10 2020-06-30 13F MKS INSTRS INC COM US LARGE-CAP EQUITIES 55306N104 0 -2,000 -100.00 0 -100.00
2020-04-27 2020-03-31 13F MKS INSTRS INC COM US LARGE-CAP EQUITIES 55306N104 2,000 0 0.00 163 -25.91 0.0053
2020-01-31 2019-12-31 13F MKS INSTRUMENT INC COM US LARGE-CAP EQUITIES 55306N104 2,000 2,000 220 0.0058
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.