Every Form 4 that Trinseo PLC (TSE) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow TSE and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full TSE filings page.
Trinseo PLC director Sandra Beach Lin reported an “other” transaction involving 42,484 Ordinary Shares tied to restricted stock units. A footnote explains this reflects a voluntary forfeiture of RSUs granted on June 25, 2025 that had not yet vested or settled. After the adjustment, she directly holds 44,776 Ordinary Shares, so the filing reflects a compensation change rather than a market trade.
Trinseo PLC director Jeanmarie F. Desmond reported a voluntary forfeiture of equity awards on May 12, 2026. The Form 4 shows an "other" transaction involving 42,484 ordinary shares at a stated price of $0.0000 per share, tied to restricted stock units.
According to the footnote, this reflects a voluntary forfeiture of restricted stock units (RSUs) that were previously granted on June 25, 2025. At the time of forfeiture, the RSU award was not vested or settled, in full or in part, so this is a compensation-related adjustment rather than an open‑market trade. Following the transaction, Desmond directly holds 46,552 ordinary shares.
Trinseo PLC director Jeffrey J. Cote reported non-market updates to his holdings. A code J transaction reclassified 42,484 Ordinary Shares at a reported price of $0.00, categorized as an “other acquisition or disposition,” reflecting entity restructuring rather than an open-market trade. Following this, he directly holds 45,699 Ordinary Shares. A separate entry shows 170,503 Ordinary Shares held indirectly through the Cote 2019 Irrevocable Indenture Trust, which has a disinterested trustee for the benefit of Cote and his children. A footnote also describes a voluntary forfeiture of previously granted restricted stock units that had not vested or settled, so no shares were issued and no sale or purchase occurred.
Trinseo PLC director Joseph Alvarado reported a voluntary forfeiture of equity awards. The Form 4 shows an "other" transaction involving 42,484 Ordinary Shares at a stated price of $0.00 per share, tied to restricted stock units (RSUs) previously granted on June 25, 2025.
The footnote explains this reflects a voluntary forfeiture of RSUs that had not yet vested or settled, rather than an open-market trade. Following this restructuring-type adjustment, Alvarado is reported as directly holding 52,187 Ordinary Shares.
Trinseo PLC director Johnson KLynne reported an “other” restructuring transaction involving 42,484 Ordinary Shares at a stated price of $0.00 per share. A footnote explains this reflects a voluntary forfeiture of restricted stock units that had been previously granted and were not yet vested or settled. Following this transaction, Johnson is reported as directly holding 48,429 Ordinary Shares.
Trinseo PLC director Victoria Brifo reported a compensation-related change in equity awards. The filing shows a voluntary forfeiture of 42,484 restricted stock units that had been granted on June 25, 2025 and had not yet vested or been settled. These units were given up without any share price involved. After this adjustment, Brifo directly holds 40,741 Ordinary Shares, indicating she retains a meaningful equity stake in the company despite the forfeiture.
Trinseo PLC director Matthew Farrell reported a voluntary forfeiture of 42,484 restricted stock units (RSUs). The RSUs had been granted on June 25, 2025 and were not vested or settled at the time they were forfeited, so no cash changed hands and no market trade occurred.
Following this non-cash compensation adjustment, Farrell’s direct holdings stand at 207,741 ordinary shares. The transaction is coded as an “Other acquisition or disposition” and reflects a restructuring-type change in equity compensation rather than a buy or sell of Trinseo stock.
Trinseo PLC director Henri Steinmetz reported an administrative equity change involving 42,484 shares. The Form 4 shows an "other" transaction in which 42,484 units linked to Ordinary Shares were adjusted at a price of $0.00 per share.
A footnote explains this reflects a voluntary forfeiture of restricted stock units that had been granted earlier and were not yet vested or settled. After this change, Steinmetz is shown as directly holding 53,453 Ordinary Shares, so the filing records a restructuring of unvested awards rather than a market purchase or sale.
Trinseo PLC senior vice president Arthas Bing reported a routine tax-related share disposition. On the vesting of previously granted restricted stock units, the company withheld 2,548 Ordinary Shares to cover taxes, coded as a tax-withholding disposition. After this non‑open‑market event, Bing directly holds 49,457 Ordinary Shares.
Trinseo PLC reported that SVP of Corporate Finance & IR, Bregje van Kessel, had 6,064 Ordinary Shares withheld on February 27, 2026 to cover taxes due on vesting of previously granted restricted stock units. After this tax-withholding disposition, she directly owned 98,296 Ordinary Shares.
Trinseo PLC senior vice president of supply chain and manufacturing services Rainer Schewe reported a tax-related share disposition. On February 27, 4,028 ordinary shares were withheld by the company at a price of $0.23 per share to cover taxes on vesting restricted stock units. After this withholding, Schewe directly owned 103,415 ordinary shares.
Trinseo PLC senior executive reports tax-related share disposition
Trinseo PLC executive Francesca Reverberi, SVP for EM and Polymer Solutions, reported a tax-withholding disposition of 1,385 ordinary shares on February 27, 2026. The shares were withheld by the company to cover taxes due upon vesting of previously granted restricted stock units.
After this withholding, Reverberi held 161,250 ordinary shares directly. The transaction used code “F,” indicating payment of tax liability by delivering securities rather than an open-market sale.
Trinseo PLC senior executive Hendriks Han, the company’s SVP and Chief Technology Officer, reported a tax-withholding share disposition related to vesting restricted stock units. On this Form 4, 7,707 Ordinary Shares were withheld at $0.23 per share to cover taxes. After this withholding, Han directly holds 73,362 Ordinary Shares.
Trinseo PLC executive Roger Greene reported an automatic tax-related share disposition linked to equity compensation. On this Form 4, the company withheld 2,517 Ordinary Shares at $0.23 per share to cover taxes due after restricted stock units vested. Following this withholding transaction, Greene directly held 45,101 Ordinary Shares. This reflects routine tax-settlement activity rather than an open-market buy or sell decision.
Trinseo PLC executive reports routine tax-related share disposition. SVP and CHRO Paula M. Cooney had 7,670 Ordinary Shares withheld by the company at a price of $0.23 per share to cover taxes due on vested restricted stock units. After this tax-withholding event, she directly owned 118,318 Ordinary Shares.
Trinseo PLC senior executive reports tax-related share withholding
Trinseo PLC executive Angelo N. Chaclas reported a disposition of 7,607 ordinary shares on February 27, 2026. The transaction was a tax-withholding disposition, where shares were withheld by the company to cover taxes due upon vesting of restricted stock units, rather than an open-market sale. After this transaction, Chaclas held 274,798 ordinary shares directly.
Trinseo PLC executive David Phillip Stasse reported a tax-related share disposition. On the tax-withholding date of vesting for previously granted restricted stock units, 10,366 Ordinary Shares were withheld by the company at a price of $0.23 per share to cover taxes. After this tax-withholding disposition, Stasse directly owned 254,788 Ordinary Shares.
Trinseo PLC reported that CEO and President Frank A. Bozich had 23,680 Ordinary Shares withheld by the company at a price of $0.23 per share to cover taxes due upon the vesting of restricted stock units. Following this tax-withholding disposition, he directly holds 664,689 Ordinary Shares.
Trinseo PLC senior vice president Francesca Reverberi reported two small share dispositions related to tax withholding, not open-market trading. On February 21 and 22, she transferred 1,163 and 333 ordinary shares, respectively, at $0.3276 per share to cover tax liabilities on vesting restricted stock units.
After these tax-withholding dispositions, Reverberi directly owned 162,635 Trinseo ordinary shares. The filing clarifies the shares were withheld by the company to pay taxes due upon the vesting of previously granted restricted stock units, rather than discretionary sales in the market.
Trinseo PLC senior executive reports tax-related share dispositions. SVP and Chief Technology Officer Han Hendriks reported two Form 4 transactions where Ordinary Shares were withheld by the company to cover taxes owed on vested restricted stock units. On February 21, 2026, 6,331 Ordinary Shares were withheld at $0.3276 per share. On February 22, 2026, a further 2,291 Ordinary Shares were withheld at $0.3276 per share. These code F transactions reflect tax-withholding dispositions rather than open-market purchases or sales.
Trinseo PLC senior vice president Yang Arthas Bing reported routine share dispositions related to taxes on equity awards. On two dates in February 2026, a total of 2,445 ordinary shares were withheld by the company at a price of $0.3276 per share to cover tax liabilities when previously granted restricted stock units vested. These tax-withholding transactions were not open-market sales. After these entries, Bing directly owned 52,005 ordinary shares.
Trinseo PLC senior vice president of corporate finance and investor relations Bregje van Kessel reported two tax-related share dispositions connected to restricted stock unit vesting. On February 21, 5,963 ordinary shares at $0.3276 per share were withheld to cover taxes, followed by 1,335 shares at the same price on February 22. These were company-withheld shares for tax liabilities, not open-market sales, and she continued to hold over 100,000 ordinary shares after each transaction.
Trinseo PLC senior vice president Rainer Schewe reported routine tax-related share dispositions. On February 21 and 22, he had 3,907 and 1,206 Ordinary Shares, respectively, withheld by the company at $0.3276 per share to cover taxes due on vesting restricted stock units. These transactions were coded as tax-withholding dispositions rather than open-market sales. After the most recent transaction, Schewe directly owned 107,443 Ordinary Shares.
Trinseo PLC senior vice president and chief human resources officer Paula M. Cooney reported two tax-related share dispositions tied to vesting restricted stock units. On February 21, 2026, 7,440 ordinary shares were withheld at $0.3276 per share to satisfy tax obligations. On February 22, 2026, a further 2,684 shares were similarly withheld at $0.3276 per share. After these transactions, Cooney directly owned 125,988 ordinary shares.
Trinseo PLC executive Roger Greene reported a routine tax-related share disposition. On February 21, 2026, 2,238 ordinary shares were withheld by the company at a price of $0.3276 per share to cover taxes due upon vesting of restricted stock units.
After this tax-withholding disposition, Greene directly owned 47,618 Trinseo ordinary shares. This was not an open-market buy or sell transaction but an administrative step tied to equity compensation.
Trinseo PLC EVP and CFO David Phillip Stasse reported routine tax-related share withholdings, not open-market trades. On February 22, 2026, the company withheld 9,671 Ordinary Shares at $0.3276 per share to cover taxes, leaving him with 265,154 shares. On February 21, 2026, a similar tax-withholding disposition of 5,028 shares at $0.3276 per share left him with 274,825 shares. A footnote clarifies these shares were withheld by the company to pay taxes following the vesting of previously granted restricted stock units.
Trinseo PLC CEO and president Frank A. Bozich reported a tax-related share disposition tied to equity compensation. On this Form 4, the company withheld 32,602 Ordinary Shares at $0.3276 per share to cover taxes due upon vesting of restricted stock units. After this withholding, Bozich’s directly held stake is shown as 688,369 Ordinary Shares, and the filing characterizes the event as a tax-withholding disposition rather than an open-market trade.
Trinseo PLC senior vice president and chief legal officer Angelo N. Chaclas reported two share dispositions that were automatic tax withholdings rather than open-market sales. On February 21, 2026, 3,690 Ordinary Shares were withheld at $0.3276 per share, and on February 22, 2026, a further 7,098 Ordinary Shares were withheld at the same price. According to the disclosure, these shares were withheld by the company to pay taxes due upon the vesting of restricted stock units, and Chaclas held 282,405 Ordinary Shares directly following the February 22 transaction.
Insider transaction summary: An officer of Trinseo PLC reported a share disposition on 10/03/2025 when 2,067 ordinary shares were withheld by the company to satisfy tax withholding obligations following the vesting of restricted stock units. The shares were reported at a withholding price of $2.33 per share. After the withholding, the reporting person beneficially owned 89,691 ordinary shares directly. The Form 4 was filed by a single reporting person and signed by an attorney-in-fact on 10/07/2025.
Johanna Frisch, VP and Treasurer of Trinseo PLC (TSE), reported a transaction on 09/30/2025 in which 2,194 ordinary shares were disposed of at a price of $2.35 per share. The filing states these shares were withheld by the company to pay taxes following the vesting of previously granted restricted stock units. After the withholding, the reporting person beneficially owned 15,898 ordinary shares. The Form 4 was signed by an attorney-in-fact on 10/02/2025.
Roger Greene, VP, Global Controller & PAO of Trinseo PLC (TSE), reported a transaction on 09/25/2025 in which 1,617 ordinary shares were disposed at $2.57 per share. The Form 4 indicates the shares were withheld by the company to pay taxes following the vesting of restricted stock units, and the reporting person now directly beneficially owns 49,856 shares. The filing was signed by an attorney-in-fact on behalf of the reporting person on 09/29/2025. The disclosure is a routine insider tax-withholding event rather than an open-market sale.