Welcome to our dedicated page for Trinseo Plc SEC filings (Ticker: TSEOF), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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Trinseo PLC: Schedule 13G/A amendment reporting >5% stake
Nut Tree Capital Management, Nut Tree Capital Management GP, LLC and Jared R. Nussbaum report shared beneficial ownership of 3,027,280 ordinary shares of Trinseo PLC as of March 31, 2026, representing approximately 8.3% of the outstanding shares. The filing states shared voting and dispositive power over these shares; the total shares outstanding cited are 36,559,868 as of March 5, 2026.
Trinseo PLC: Schedule 13G/A amendment reporting >5% stake
Nut Tree Capital Management, Nut Tree Capital Management GP, LLC and Jared R. Nussbaum report shared beneficial ownership of 3,027,280 ordinary shares of Trinseo PLC as of March 31, 2026, representing approximately 8.3% of the outstanding shares. The filing states shared voting and dispositive power over these shares; the total shares outstanding cited are 36,559,868 as of March 5, 2026.
Trinseo PLC reports that counterparties under its Credit and Security Agreement for the accounts receivable securitization facility have extended the expiration date of an existing waiver to May 27, 2026. The company emphasizes that no new waiver agreement was signed; only the prior waiver’s term was extended.
The filing also notes that the company’s ordinary shares were delisted from the NYSE following a Form 25 filed on March 23, 2026, with the delisting effective March 30, 2026. Trinseo’s shares now trade over the counter under the symbol TSEOF.
Trinseo PLC reports that counterparties under its Credit and Security Agreement for the accounts receivable securitization facility have extended the expiration date of an existing waiver to May 27, 2026. The company emphasizes that no new waiver agreement was signed; only the prior waiver’s term was extended.
The filing also notes that the company’s ordinary shares were delisted from the NYSE following a Form 25 filed on March 23, 2026, with the delisting effective March 30, 2026. Trinseo’s shares now trade over the counter under the symbol TSEOF.
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 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 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 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 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 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 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 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 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.