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Public ownership evidence

MKS Inc. Common Stock (MKSI) Ownership Disclosures

Read MKSI insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-14T23:32:50.005Z

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2026-09-032026-09-01Mora ElizabethS300Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-01 and its public availability date is 2026-09-03. Subtracting those calendar dates gives 2 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001049502-26-000119 ↗SEC 0001049502-26-000115 ↗SEC 0001049502-26-000113 ↗

Recent Form 4 activity

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2026-09-032026-09-01Mora ElizabethS300Not reported
2026-08-192026-08-17Donlan Renee MartelA954.04Not reported
2026-08-182026-08-14Lee John Tseng-ChungS10,000Not reported
2026-08-052026-08-03Williams John EdwardS457Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 50 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Cornerstone Financial Management LLC2026-06-302026-08-2946$20,461None
Cornerstone Financial Management LLC2026-03-312026-08-2929$6,664None
Cornerstone Financial Management LLC2025-12-312026-08-2929$4,634None
Advisors Asset Management, Inc.2021-12-312026-08-2817,427$3,035,261None
Advisors Asset Management, Inc.2022-12-312026-08-281,939$164,291None
Advisors Asset Management, Inc.2020-06-302026-08-285,864$664,039None
Advisors Asset Management, Inc.2022-06-302026-08-284,951$508,000None
Advisors Asset Management, Inc.2021-09-302026-08-2817,101$2,581,000None
Corient Private Wealth LP2026-06-302026-08-2834,400$15,301,178None
Corient Private Wealth LP2026-06-302026-08-281,760$782,848None
Principia Wealth Advisory, LLC2026-06-302026-08-2710$4,448None
Principia Wealth Advisory, LLC2026-03-312026-08-2710$2,298None
Advisors Asset Management, Inc.2022-09-302026-08-274,723$390,000None
Advisors Asset Management, Inc.2020-12-312026-08-2712,121$1,824,000None
Advisors Asset Management, Inc.2022-03-312026-08-279,120$1,368,000None
Advisors Asset Management, Inc.2023-03-312026-08-271,876$166,251None
Advisors Asset Management, Inc.2021-03-312026-08-2714,829$2,749,593None
Advisors Asset Management, Inc.2021-06-302026-08-2715,974$2,843,000None
Advisors Asset Management, Inc.2020-09-302026-08-275,041$550,628None
Advisors Asset Management, Inc.2019-12-312026-08-2610,418$1,146,084None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-03-312026-08-2615,100$3,470,131None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-2622,900$10,185,920None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2578,086$34,732,653None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2534,732,653$78,086,000None
Advisors Asset Management, Inc.2020-03-312026-08-229,291$756,752None
WEST MICHIGAN ADVISORS, LLC2026-06-302026-08-223,561$1,583,933None
Assenagon Asset Management S.A.2026-06-302026-08-2224,009$10,679,203None
Harvest Fund Management Co., Ltd2026-06-302026-08-211,817$807,000None
BOUSSARD & GAVAUDAN GESTION SAS2026-06-302026-08-2016,154$47,141,619None
Archer Investment Corp2026-06-302026-08-204,545$2,021,616None
Expect Equity LLC2026-03-312026-08-2018,485$4,248,038None
Expect Equity LLC2025-12-312026-08-2024,015$3,837,597None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2020,067$8,925,836None
Advisors Asset Management, Inc.2019-03-312026-08-1920,713$1,927,345None
Advisors Asset Management, Inc.2019-09-302026-08-1911,702$1,079,861None
Advisors Asset Management, Inc.2019-06-302026-08-1914,266$1,111,179None
JDM Financial Group LLC2026-06-302026-08-1952$23,130None
Ensign Peak Advisors, Inc2026-03-312026-08-194,047$930,041None
Ensign Peak Advisors, Inc2025-12-312026-08-193,747$598,771None
Ensign Peak Advisors, Inc2025-09-302026-08-1910,997$1,361,099None
Fulcrum Asset Management LLP2026-06-302026-08-191,177$489,632None
Strive Financial Group ,LLC2026-06-302026-08-1844$19,577None
Caitlin John, LLC2026-06-302026-08-1814$6,227None
Corient Private Wealth LP2026-06-302026-08-1834,868$15,508,898None
Empowered Funds, LLC2026-06-302026-08-183,062$1,361,978None
Empowered Funds, LLC2026-06-302026-08-18369$164,131None
Empowered Funds, LLC2026-06-302026-08-18260$115,648None
Empowered Funds, LLC2026-06-302026-08-1823$10,230None
Pure Financial Advisors, LLC2026-06-302026-08-18754$335,530None
Transamerica Financial Advisors, LLC2026-06-302026-08-1889$39,587None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Corient Private Wealth LP ↗Corient Private Wealth LP ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.