CBT insider ownership: who sold, why, and what they still hold

What stands out

Sean Keohane sold $19.6M of stock with no disclosed trading plan. The filings don't state a reason.Largest such sale, Aug 28, 2026

A share of stake is shown for 0 of the 1 officer or director who sold. 19 are left out

Left out: Sean Keohane, Jeff Zhu, Hobart Kalkstein, Erica McLaughlin, Cabot Enriquez, Karen Kalita, William Kirby, Michael Morrow, Cynthia Arnold, Frank Wilson, Christine Yan, Matthew Wood, Douglas Delgrosso, Lisa Dumont, Raffiq Nathoo, Steven Delahunt, Michelle Williams, William Masterson III and Thierry Vanlancker (share of stake is being verified).

Disclosed company stock is not an insider's whole wealth.

Who sold, and how much of their stake

Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.

Sean Keohane

President and CEO, Director

Not confirmed

Share of stake not shown: share of stake is being verified. Why

$19.6MNo plan disclosed

Amounts, filings and trading plans for each seller

Selling by month

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 plan disclosedOne dollar scale for every month; the tallest bar is labeled

Recent activity

Past 30 days, Sep 17, 2026 to Oct 16, 2026

No officer or director trades were reported for the past 30 days. The most recent before that:

Aug 28, 2026Sean Keohane sold 135K shares ($11.5M) with no plan disclosed. 135K shares came in from vesting or option exercises the same day, so the holding rose by 0 net.

Who	Shares	Price	% of total stake	Total stake after	Trade date	Filed
Sean Keohane President and CEO, Director	134,895	$85.00	n/a	n/a	Aug 28, 2026	Aug 31, 2026

Common questions

Is the Cabot Corp CEO selling stock?

Yes. Sean Keohane sold 230K shares ($19.6M) in the past 12 months, none of it under a trading plan disclosed in the filings.

Why are Cabot Corp insiders selling?

Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 0% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 100% had no disclosed plan. A trading plan schedules sales in advance.

Are any Cabot Corp insiders buying?

No. Officers and directors reported no purchases in the past 12 months.

The evidence

Who sold1 officer or director: amount, % of holdings, trading plan

Who sold	Amount	% of holdings	Trading plan
Sean Keohane President and CEO, Director	$19.6M 230K shares	Not confirmed share of stake is being verified. Why	No plan disclosed

The full ownership picture0 of 19 officers and directors confirmed

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

Sean Keohane

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 Sean Keohane are complete.

President and CEO, Director

n/a

−230K

n/a

Vesting, gifts, unvested awards and holding lines for Sean Keohane

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Sean Keohane are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

−21Kwithheld by the company for taxes

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
79,139	$74.40	Nov 9, 2033	$839K
50,600	$114.99	Nov 7, 2034	$0
122,114	$59.76	Nov 18, 2035	$3.1M

Estimate: options held × ($85.00 − strike price), using the most recent insider trade price on Form 4 (Aug 28, 2026), not a market close.

Jeff Zhu

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 Jeff Zhu are complete.

Executive Vice President

n/a

Vesting, gifts, unvested awards and holding lines for Jeff Zhu

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jeff Zhu 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

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
13,402	$74.40	Nov 9, 2033	$142K
8,563	$114.99	Nov 7, 2034	$0
22,544	$59.76	Nov 18, 2035	$569K

Estimate: options held × ($85.00 − strike price), using the most recent insider trade price on Form 4 (Aug 28, 2026), not a market close.

Hobart Kalkstein

Executive Vice President

n/a

Vesting, gifts, unvested awards and holding lines for Hobart Kalkstein

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Hobart Kalkstein are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
8,119	$58.27	Nov 11, 2031	$217K
5,594	$73.84	Nov 10, 2032	$62K
14,040	$74.40	Nov 9, 2033	$149K
9,341	$114.99	Nov 7, 2034	$0

Estimate: options held × ($85.00 − strike price), using the most recent insider trade price on Form 4 (Aug 28, 2026), not a market close.

Erica McLaughlin

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 Erica McLaughlin are complete.

Executive Vice President, CFO

n/a

Vesting, gifts, unvested awards and holding lines for Erica McLaughlin

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Erica McLaughlin are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

−4.5Kwithheld by the company for taxes

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
17,231	$74.40	Nov 9, 2033	$183K
11,677	$114.99	Nov 7, 2034	$0
30,998	$59.76	Nov 18, 2035	$782K

Estimate: options held × ($85.00 − strike price), using the most recent insider trade price on Form 4 (Aug 28, 2026), not a market close.

Cabot Enriquez

Director

n/a

Vesting, gifts, unvested awards and holding lines for Cabot Enriquez

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Cabot Enriquez are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Karen Kalita

SVP and General Counsel

n/a

Vesting, gifts, unvested awards and holding lines for Karen Kalita

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Karen Kalita are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

−1.8Kwithheld by the company for taxes

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
10,211	$74.40	Nov 9, 2033	$108K
6,616	$114.99	Nov 7, 2034	$0
16,908	$59.76	Nov 18, 2035	$427K

Estimate: options held × ($85.00 − strike price), using the most recent insider trade price on Form 4 (Aug 28, 2026), not a market close.

William Kirby

Director

n/a

Vesting, gifts, unvested awards and holding lines for William Kirby

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for William Kirby are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Michael Morrow

Director

n/a

Vesting, gifts, unvested awards and holding lines for Michael Morrow

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michael Morrow are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Cynthia Arnold

Director

n/a

Vesting, gifts, unvested awards and holding lines for Cynthia Arnold

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Cynthia Arnold are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Frank Wilson

Director

n/a

Vesting, gifts, unvested awards and holding lines for Frank Wilson

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Frank Wilson are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Christine Yan

Director

n/a

Vesting, gifts, unvested awards and holding lines for Christine Yan

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Christine Yan are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Matthew Wood

Senior Vice President

n/a

Vesting, gifts, unvested awards and holding lines for Matthew Wood

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Matthew Wood are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

−613withheld by the company for taxes

Douglas Delgrosso

Director

n/a

Vesting, gifts, unvested awards and holding lines for Douglas Delgrosso

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Douglas Delgrosso are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Lisa Dumont

VP, Controller & CAO

n/a

Vesting, gifts, unvested awards and holding lines for Lisa Dumont

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Lisa Dumont are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

−558withheld by the company for taxes

Raffiq Nathoo

Director

n/a

Vesting, gifts, unvested awards and holding lines for Raffiq Nathoo

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Raffiq Nathoo are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Steven Delahunt

Interim CFO

n/a

Vesting, gifts, unvested awards and holding lines for Steven Delahunt

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Steven Delahunt are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Michelle Williams

Director

n/a

Vesting, gifts, unvested awards and holding lines for Michelle Williams

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michelle Williams are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

William Masterson III

Senior Vice President

n/a

Vesting, gifts, unvested awards and holding lines for William Masterson III

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for William Masterson III are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Stock options (not counted as shares):

Options held	Strike price	Expires	Intrinsic value (estimate)
12,767	$64.54	Dec 2, 2035	$261K

Estimate: options held × ($85.00 − strike price), using the most recent insider trade price on Form 4 (Aug 28, 2026), not a market close.

Thierry Vanlancker

Director

n/a

Vesting, gifts, unvested awards and holding lines for Thierry Vanlancker

Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Thierry Vanlancker are complete; balances and unit counts will be added when the check is finished.

0gifted (net of own trusts)

Holdings and share of stake for Cabot Corp 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.

What explains the selling$19.6M of sales by plan status, purpose, seller and month

Officer and director open-market sales: $19.6M across 229,597 shares. Plan status and stated purpose are separate questions, and a sale can have both.

By plan status

No plan disclosed · $19.6M

Sales with no 10b5-1 plan and no tax reference in the filing. $19.6M of it is Sean Keohane. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Sean Keohane, Aug 28, 2026

Taxes

30,418 shares ($1.8M) 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
Sean Keohane President and CEO, Director	230K	$19.6M	0%	100%	Aug 7, 2026 to Aug 28, 2026

Sales by month

Month	Sale proceeds	Disclosed plan	To cover taxes	No plan disclosed
Oct 2025	$0	$0	$0	$0
Nov 2025	$0	$0	$0	$0
Dec 2025	$0	$0	$0	$0
Jan 2026	$0	$0	$0	$0
Feb 2026	$0	$0	$0	$0
Mar 2026	$0	$0	$0	$0
Apr 2026	$0	$0	$0	$0
May 2026	$0	$0	$0	$0
Jun 2026	$0	$0	$0	$0
Jul 2026	$0	$0	$0	$0
Aug 2026	$19.6M	$0	$0	$19.6M
Sep 2026	$0	$0	$0	$0
Oct 2026	$0	$0	$0	$0

Is this normal? Selling year by year5 earlier years to compare with

More than usual: about 1.9x the 5-year average. 1 insider sold; the average is 4 a year.

12 months ending	Shares sold	Insiders who sold	Proceeds
Oct 16, 2026 Latest 12 months	230K	1	$19.6M
Oct 16, 2025 1 year earlier	165K	4	$14.8M
Oct 16, 2024 2 years earlier	328K	5	$29.0M
Oct 17, 2023 3 years earlier	10K	1	$833K
Oct 17, 2022 4 years earlier	75K	5	$5.5M
Oct 17, 2021 5 years earlier	26K	3	$1.6M

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.

Known gaps and uncertainty19 officers and directors not confirmed

Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Cabot Corp 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.

Sources and methodology1,697 filings on record, 73 filed in the 12-month period, and how we read them

All 1,697 Forms 3, 4 and 5 on record for Cabot Corp (SEC CIK 16040), filed from Jun 20, 2003 to Oct 7, 2026; 73 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.

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".

Full methodology

Former or inactive filers (34)No filing in 18 months; last reported balances, not in any total

Name	Last filed	Last reported balance
Matthais Wolfgruber	Mar 18, 2025	22,099 shares, last reported balance as of Jan 10, 2025
Sue Rataj	Jan 12, 2024	27,460 shares, last reported balance as of Jan 11, 2024
Mark Wrighton	Jan 11, 2021	47,690 shares, last reported balance as of Jan 7, 2021
John Obrien	Jan 13, 2020	53,992 shares, last reported balance as of Jan 9, 2020
Patrick Prevost	Jan 13, 2020	227,984 shares, last reported balance as of Jan 9, 2020
James Kelly	Jan 3, 2020	35,685 shares, last reported balance as of Nov 20, 2019
John Doubman	Oct 2, 2019	28,207 shares, last reported balance as of Mar 14, 2019
Brian Berube	Mar 12, 2019	64,131 shares, last reported balance as of Mar 11, 2019
John McGillicuddy	Jan 14, 2019	20,273 shares, last reported balance as of Jan 10, 2019
Friedrich von Gottberg	Nov 21, 2018	39,696 shares, last reported balance as of Nov 20, 2018
Nicholas Cross	Aug 22, 2018	48,597 shares, last reported balance as of Aug 21, 2018
Eduardo Cordeiro	Mar 12, 2018	80,060 shares, last reported balance as of Mar 11, 2018
Roderick Macleod	Jan 17, 2018	51,293 shares, last reported balance as of Jan 12, 2018
Lydia Thomas	Jan 17, 2017	32,849 shares, last reported balance as of Jan 13, 2017
Ronaldo Schmitz	Jan 12, 2016	27,942 shares, last reported balance as of Jan 8, 2016
Henry McCance	Jan 12, 2016	21,942 shares, last reported balance as of Jan 8, 2016
John Clarkeson	Jan 13, 2015	33,142 shares, last reported balance as of Jan 9, 2015
David Miller	Nov 13, 2014	29,862 shares, last reported balance as of Nov 13, 2014
Gautam Kaji	Jan 14, 2014	23,619 shares, last reported balance as of Jan 10, 2014
Arthur Goldstein	Jan 19, 2011	27,949 shares, last reported balance as of Jan 14, 2011
Shengman Zhang	Jan 11, 2010	9,375 shares, last reported balance as of Jan 8, 2010
SPO ADVISORY CORP	Jun 1, 2009	52,983,750 shares, last reported balance as of May 28, 2009
William Brady	May 19, 2009	119,959 shares, last reported balance as of May 18, 2009
Jonathan Mason	Feb 17, 2009	6,254 shares, last reported balance as of Feb 13, 2009
Ravijit Paintal	Aug 8, 2007	59,716 shares, last reported balance as of Aug 6, 2007
Kennett Burnes	Aug 7, 2007	845,570 shares, last reported balance as of Aug 3, 2007
Dirk Blevi	Jul 17, 2007	65,417 shares, last reported balance as of Jul 16, 2007
John McArthur	Jan 17, 2007	4,935 shares, last reported balance as of Jan 12, 2007
John Shaw	Dec 29, 2005	92,409 shares, last reported balance as of Dec 22, 2005
Paul Gormisky	Dec 20, 2005	90,109 shares, last reported balance as of Dec 16, 2005
David Elliott	Aug 3, 2005	29,201 shares, last reported balance as of Aug 2, 2005
John Cabot	Jan 18, 2005	2,419,137 shares, last reported balance as of Jan 14, 2005
Carol Flack	Aug 4, 2004	22,004 shares, last reported balance as of Aug 2, 2004
Thomas Odle	Aug 7, 2003	110,623 shares, last reported balance as of Aug 5, 2003

Spotted something wrong on this page? Report an error. We check every report against the SEC filing and list what we fix in the corrections log.

Cabot Corp insiders sold $19.6M in the past 12 months. How much of their stake is that?

What stands out

Who sold, and how much of their stake

Selling by month

Recent activity

Common questions

Is the Cabot Corp CEO selling stock?

Why are Cabot Corp insiders selling?

Are any Cabot Corp insiders buying?

The evidence

No plan disclosed · $19.6M

Taxes

Sales by month