Company · Ownership research

MKS INC MKSI

CIK 0001049502

Form 4 transactions dated Nov 1, 2023 to Nov 12, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 92 rows; the complete set is available through the API.

Insider filings on file run through Nov 3, 2026.

Insider purchases & sales

Purchased: $170.86K
Sold: $53.59M

Nov 1, 2023 – Nov 3, 2026
Available records · partial months are marked ·

202410 of 15 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Dec 10, 2024	Moloney Jacqueline F Director	Sale10b5-1 footnote	$34.44K 300 shares sold	2.92% sold Direct holding	▾
Dec 2, 2024	Mora Elizabeth Director	Sale10b5-1 footnote	$31.19K 275 shares sold	1.53% sold Direct holding	▾
Oct 1, 2024	Moloney Jacqueline F Director	Sale10b5-1 footnote	$27.23K 250 shares sold	2.37% sold Direct holding	▾
Sep 3, 2024	Mora Elizabeth Director	Sale10b5-1 footnote	$31.89K 275 shares sold	1.51% sold Direct holding	▾
Aug 16, 2024	Williams John Edward EVP & GM, PSD	Sale	$213.68K 1,800 shares sold	99.28% sold Direct holding	▾
Aug 1, 2024	Moloney Jacqueline F Director	Sale10b5-1 footnote	$30.86K 250 shares sold	2.32% sold Direct holding	▾
Jun 3, 2024	Mora Elizabeth Director	Sale10b5-1 footnote	$35.59K 275 shares sold	1.49% sold Direct holding	▾
Apr 1, 2024	Mora Elizabeth Director	Sale10b5-1 footnote	$33.25K 250 shares sold	1.46% sold Direct holding	▾
Mar 1, 2024	Moloney Jacqueline F Director	Sale10b5-1 footnote	$30.72K 250 shares sold	2.66% sold Direct holding	▾
Mar 1, 2024	Burke Kathleen Flaherty EVP, GC & Secretary	Sale	$910.74K 7,411 shares sold	14.70% sold Direct holding	▾

Showing 15 / 15 record groups in 2024. The complete set is available through the API.

MKS INC · MKSI

Follow the people behind the trades.

Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and reach other datasets through the Akkru API.

Download CSV
Earlier filings
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 15 of 15 purchase / sale groups and 30 of 92 other groups; the totals and the monthly series cover the whole window.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_insider_transactions
{"action":"list","ticker":"MKSI","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.