Beta0% was sold under disclosed trading plans, 100% with no plan disclosed. The largest seller, William Thorndike Jr. (Director), sold $15.4M. 44% of these sales were shares from exercising options.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 5 officers and directors who sold. 13 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: William Thorndike Jr., Haitham Khouri, Nicholas Howley, Vivek Raj, Robert Henderson, Tracy Cool, Jorge Valladares III, Bernt Iversen II, Sean Hennessy, Noriko Yokozuka, Jeffrey Emery, Kyle Sable and Grant Bowman (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 |
|---|---|---|---|---|---|---|
| Haitham Khouri Chief Executive Officer, Director | 117,511 | $31.19 | n/a | n/a | May 22, 2026 | May 22, 2026 |
WindAcre Partnership Master Fund, LP sold $196M in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.
Yes. Haitham Khouri sold 230K shares ($7.3M) in the past 12 months, none 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: 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.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| William Thorndike Jr. Director | $15.4M 650K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Kyle Sable Chief Financial Officer | $10.8M 350K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Haitham Khouri Chief Executive Officer, Director | $7.3M 230K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Jeffrey Emery President - Global Fire Safety | $6.6M 200K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Noriko Yokozuka General Counsel | $3.9M 138K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
Outside holder, reported separately: WindAcre Partnership Master Fund, LP (a 10% owner, not part of management). Sold $196M (5.71M shares) from Jun 26, 2026 to Jun 30, 2026. Latest filing
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 | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
William Thorndike Jr.!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 William Thorndike Jr. are complete. Director | n/a | −650K | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for William Thorndike Jr.Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for William Thorndike Jr. are complete; balances and unit counts will be added when the check is finished. −674Kgifted (net of own trusts) | ||||||||||||||||||||||||||||||||||||
Haitham Khouri!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 Haitham Khouri are complete. Chief Executive Officer, Director | n/a | −230K | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Haitham KhouriHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Haitham Khouri 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Nicholas Howley!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 Nicholas Howley are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Nicholas HowleyHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Nicholas Howley are complete; balances and unit counts will be added when the check is finished. −6.33Mgifted (net of own trusts) | ||||||||||||||||||||||||||||||||||||
Vivek Raj!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 Vivek Raj are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Vivek RajHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Vivek Raj 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Robert Henderson!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 Robert Henderson are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Robert HendersonHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Robert Henderson 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Tracy Cool!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 Tracy Cool are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Tracy CoolHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Tracy Cool 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Jorge Valladares 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 Jorge Valladares III are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Jorge Valladares IIIHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jorge Valladares 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Bernt Iversen II!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 Bernt Iversen II are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Bernt Iversen IIHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Bernt Iversen II 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Sean Hennessy!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 Hennessy are complete. Director | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Sean HennessyHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Sean Hennessy 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Noriko Yokozuka!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 Noriko Yokozuka are complete. General Counsel | n/a | −138K | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Noriko YokozukaHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Noriko Yokozuka 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Jeffrey Emery!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 Jeffrey Emery are complete. President - Global Fire Safety | n/a | −200K | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Jeffrey EmeryHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jeffrey Emery 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Kyle Sable!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 Kyle Sable are complete. Chief Financial Officer | n/a | −350K | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Kyle SableHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kyle Sable 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Grant Bowman!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 Grant Bowman are complete. President, Specialty Products | n/a | 0 | n/a | n/a | ||||||||||||||||||||||||||||||||
Vesting, gifts, unvested awards and holding lines for Grant BowmanHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Grant Bowman 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):
Estimate: options held × ($33.90 − strike price), using the most recent insider trade price on Form 4 (Jun 30, 2026), not a market close. | ||||||||||||||||||||||||||||||||||||
Holdings and share of stake for Perimeter Solutions, 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: $44.0M across 1,567,035 shares. Plan status and stated purpose are separate questions, and a sale can have both.
Sales with no 10b5-1 plan and no tax reference in the filing. $15.4M of it is William Thorndike Jr.. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Kyle Sable, May 8, 2026
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| William Thorndike Jr. Director | 650K | $15.4M | 0% | 35% | Mar 4, 2026 to Mar 11, 2026 |
| Kyle Sable Chief Financial Officer | 350K | $10.8M | 0% | 25% | Dec 12, 2025 to May 13, 2026 |
| Haitham Khouri Chief Executive Officer, Director | 230K | $7.3M | 0% | 17% | May 20, 2026 to May 22, 2026 |
| Jeffrey Emery President - Global Fire Safety | 200K | $6.6M | 0% | 15% | May 8, 2026 to May 13, 2026 |
| Noriko Yokozuka General Counsel | 138K | $3.9M | 0% | 9% | Dec 12, 2025 to Dec 12, 2025 |
| 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 | $6.8M | $0 | $0 | $6.8M |
| Jan 2026 | $0 | $0 | $0 | $0 |
| Feb 2026 | $0 | $0 | $0 | $0 |
| Mar 2026 | $15.4M | $0 | $0 | $15.4M |
| Apr 2026 | $0 | $0 | $0 | $0 |
| May 2026 | $21.8M | $0 | $0 | $21.8M |
| Jun 2026 | $0 | $0 | $0 | $0 |
| Jul 2026 | $0 | $0 | $0 | $0 |
| Aug 2026 | $0 | $0 | $0 | $0 |
| Sep 2026 | $0 | $0 | $0 | $0 |
| Oct 2026 | $0 | $0 | $0 | $0 |
More than usual: about 3x the 3-year average. 5 insiders sold; the average is 2 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 16, 2026 Latest 12 months | 1.57M | 5 | $44.0M |
| Oct 16, 2025 1 year earlier | 1.33M | 5 | $19.0M |
| Oct 16, 2024 2 years earlier | 0 | 0 | $0 |
| Oct 17, 2023 3 years earlier | 188K | 1 | $2.0M |
| Oct 17, 2022 4 years earlier · filings don't cover the whole year | n/a | n/a | n/a |
| Oct 17, 2021 5 years earlier · filings don't cover the whole year | n/a | n/a | n/a |
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 Perimeter Solutions, 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 134 Forms 3, 4 and 5 on record for Perimeter Solutions, Inc. (SEC CIK 1880319), filed from Nov 5, 2021 to Jul 13, 2026; 31 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".
| Name | Last filed | Last reported balance |
|---|---|---|
| Edward Goldberg | Feb 21, 2025 | 445,914 shares, last reported balance as of Feb 20, 2025 |
| Charles Kropp | May 6, 2022 | No balance on record |
| Stephen Cornwall | Apr 1, 2022 | 42,087 shares, last reported balance as of Mar 30, 2022 |
| Shannon Horn | Apr 1, 2022 | 445,695 shares, last reported balance as of Mar 30, 2022 |
| Ernest Kremling II | Apr 1, 2022 | 150,498 shares, last reported balance as of Mar 30, 2022 |
| Barry Lederman | Apr 1, 2022 | 196,416 shares, last reported balance as of Mar 30, 2022 |
| Kevin Stein | Nov 10, 2021 | 115,000 shares, last reported balance as of Nov 9, 2021 |
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