Beta41% was sold under disclosed trading plans, 59% with no plan disclosed. The largest seller, John Lee (President & CEO, Director), sold $13.9M.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
A share of stake is shown for 0 of the 13 officers and directors who sold. 16 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: John Lee, Gerald Colella, Kathleen Burke, James Schreiner, Elizabeth Mora, Eric Taranto, David Henry, Raj Batra, Jacqueline Moloney, Joseph Donahue, Peter Cannone III, Renee Donlan, Wissam Jabre, John Williams, Michelle McCarthy and Ramakumar Mayampurath (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
No officer or director trades were reported for the past 30 days. The most recent before that:
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Elizabeth Mora Director | 300 | $250.96 | n/a | n/a | Sep 1, 2026 | Sep 2, 2026 |
Yes. John Lee sold 50K shares ($13.9M) in the past 12 months, 44% of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 41% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 59% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| John Lee President & CEO, Director | $13.9M 50K shares | Not confirmedshare of stake is being verified. Why | 44% under a disclosed plan 56% no plan disclosed |
| Gerald Colella Director | $11.7M 40K shares | Not confirmedshare of stake is being verified. Why | 57% under a disclosed plan 43% no plan disclosed |
| David Henry EVP, Global Str Mktg & GM, MSD | $3.2M 11K shares | Not confirmedshare of stake is being verified. Why | 26% under a disclosed plan 74% no plan disclosed |
| Ramakumar Mayampurath EVP & CFO | $2.8M 8.8K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| James Schreiner EVP & COO | $2.6M 9.1K shares | Not confirmedshare of stake is being verified. Why | 13% under a disclosed plan 87% no plan disclosed |
| Kathleen Burke EVP, GC & Secretary | $2.5M 8.6K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Eric Taranto EVP & Gm, Vsd | $2.3M 8.9K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Michelle McCarthy SVP & Chief Accounting Officer | $1.1M 3.9K shares | Not confirmedshare of stake is being verified. Why | 68% under a disclosed plan 32% no plan disclosed |
| Jacqueline Moloney Director | $1.0M 3.6K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Peter Cannone III Director | $732K 2.6K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Joseph Donahue Director | $689K 2.1K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| John Williams EVP & Gm, Psd | $656K 2.5K shares | Not confirmedshare of stake is being verified. Why | 20% under a disclosed plan 80% no plan disclosed |
| Elizabeth Mora Director | $290K 1.2K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 16, 2025 | Sold | Held Oct 16, 2026 | Still held |
|---|---|---|---|---|
John Lee!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for John Lee are complete. President & CEO, Director | n/a | −50K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for John LeeHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for John Lee are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −35Kwithheld by the company for taxes | ||||
Gerald Colella!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Gerald Colella are complete. Director | n/a | −40K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Gerald ColellaHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Gerald Colella are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Kathleen Burke!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kathleen Burke are complete. EVP, GC & Secretary | n/a | −8.6K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Kathleen BurkeHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kathleen Burke are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −6.1Kwithheld by the company for taxes | ||||
James Schreiner!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for James Schreiner are complete. EVP & COO | n/a | −9.1K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for James SchreinerHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for James Schreiner are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −4.3Kwithheld by the company for taxes | ||||
Elizabeth Mora!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Elizabeth Mora are complete. Director | n/a | −1.2K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Elizabeth MoraHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Elizabeth Mora are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Eric Taranto!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. See the filing Sales and other transactions for Eric Taranto are complete. EVP & Gm, Vsd | n/a | −8.9K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Eric TarantoHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Eric Taranto are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −2.7Kwithheld by the company for taxes | ||||
David Henry!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. See the filing Sales and other transactions for David Henry are complete. EVP, Global Str Mktg & GM, MSD | n/a | −11K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for David HenryHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for David Henry are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −4.1Kwithheld by the company for taxes | ||||
Raj Batra!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Raj Batra are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Raj BatraHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Raj Batra are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Jacqueline Moloney!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jacqueline Moloney are complete. Director | n/a | −3.6K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jacqueline MoloneyHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jacqueline Moloney are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Joseph Donahue!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Joseph Donahue are complete. Director | n/a | −2.1K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Joseph DonahueHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Joseph Donahue are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Peter Cannone III!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Peter Cannone III are complete. Director | n/a | −2.6K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Peter Cannone IIIHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Peter Cannone III are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Renee Donlan!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Renee Donlan are complete. EVP, GC & Cco | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Renee DonlanHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Renee Donlan are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Wissam Jabre!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Wissam Jabre are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Wissam JabreHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Wissam Jabre are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
John Williams!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for John Williams are complete. EVP & Gm, Psd | n/a | −2.5K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for John WilliamsHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for John Williams are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −2Kwithheld by the company for taxes | ||||
Michelle McCarthy!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Michelle McCarthy are complete. SVP & Chief Accounting Officer | n/a | −3.9K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Michelle McCarthyHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michelle McCarthy are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −1.4Kwithheld by the company for taxes | ||||
Ramakumar Mayampurath!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Ramakumar Mayampurath are complete. EVP & CFO | n/a | −8.8K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Ramakumar MayampurathHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Ramakumar Mayampurath are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −5.1Kwithheld by the company for taxes | ||||
Holdings and share of stake for Mks Inc are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $43.5M across 151,749 shares. Plan status and stated purpose are separate questions, and a sale can have both.
The lighter segment is sales with no plan disclosed in the filing ($25.5M), including tax-related sales outside a plan.
Sales with no 10b5-1 plan and no tax reference in the filing. $7.7M of it is John Lee. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: John Lee, Feb 20, 2026
60,340 shares ($15.1M) were withheld by the company for taxes, which isn't a market sale.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| John Lee President & CEO, Director | 50K | $13.9M | 44% | 32% | Feb 20, 2026 to Aug 14, 2026 |
| Gerald Colella Director | 40K | $11.7M | 57% | 27% | Feb 20, 2026 to May 27, 2026 |
| David Henry EVP, Global Str Mktg & GM, MSD | 11K | $3.2M | 26% | 7% | Feb 20, 2026 to Jun 1, 2026 |
| Ramakumar Mayampurath EVP & CFO | 8.8K | $2.8M | 100% | 6% | May 22, 2026 to May 22, 2026 |
| James Schreiner EVP & COO | 9.1K | $2.6M | 13% | 6% | Oct 22, 2025 to Jun 12, 2026 |
| Kathleen Burke EVP, GC & Secretary | 8.6K | $2.5M | 0% | 6% | Feb 20, 2026 to May 11, 2026 |
| Eric Taranto EVP & Gm, Vsd | 8.9K | $2.3M | 0% | 5% | Feb 20, 2026 to May 11, 2026 |
| Michelle McCarthy SVP & Chief Accounting Officer | 3.9K | $1.1M | 68% | 3% | Feb 20, 2026 to Jun 5, 2026 |
| Jacqueline Moloney Director | 3.6K | $1.0M | 0% | 2% | Feb 20, 2026 to May 14, 2026 |
| Peter Cannone III Director | 2.6K | $732K | 0% | 2% | Feb 20, 2026 to May 18, 2026 |
| Joseph Donahue Director | 2.1K | $689K | 0% | 2% | May 27, 2026 to May 27, 2026 |
| John Williams EVP & Gm, Psd | 2.5K | $656K | 20% | 2% | Feb 20, 2026 to Aug 3, 2026 |
| Elizabeth Mora Director | 1.2K | $290K | 100% | 0.7% | Dec 2, 2025 to Sep 1, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $99K | $99K | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 | $0 |
| Dec 2025 | $48K | $48K | $0 | $0 |
| Jan 2026 | $0 | $0 | $0 | $0 |
| Feb 2026 | $17.2M | $0 | $0 | $17.2M |
| Mar 2026 | $1.2M | $72K | $0 | $1.1M |
| Apr 2026 | $0 | $0 | $0 | $0 |
| May 2026 | $17.6M | $13.4M | $0 | $4.2M |
| Jun 2026 | $4.2M | $1.1M | $0 | $3.1M |
| Jul 2026 | $0 | $0 | $0 | $0 |
| Aug 2026 | $3.2M | $3.2M | $0 | $0 |
| Sep 2026 | $75K | $75K | $0 | $0 |
| Oct 2026 | $0 | $0 | $0 | $0 |
More than usual: $43.5M sold, after almost none in the past 5 years. 13 insiders sold; the average is 5 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 16, 2026 Latest 12 months | 152K | 13 | $43.5M |
| Oct 16, 2025 1 year earlier | 19K | 5 | $2.1M |
| Oct 16, 2024 2 years earlier | 66K | 6 | $7.9M |
| Oct 17, 2023 3 years earlier | 49K | 5 | $4.8M |
| Oct 17, 2022 4 years earlier | 4K | 3 | $596K |
| Oct 17, 2021 5 years earlier | 14K | 5 | $2.5M |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Mks Inc are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 1,703 Forms 3, 4 and 5 on record for Mks Inc (SEC CIK 1049502), filed from Feb 8, 2002 to Sep 2, 2026; 61 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 16, 2026. Prices are the ones reported in each filing, often weighted averages. 1 older filing exists only on paper and could not be read.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
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