Welcome to our dedicated page for Trinseo Plc SEC filings (Ticker: TSE), 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.
Trinseo PLC filings document material-event disclosures for an Ireland-incorporated specialty materials issuer, including operating results, earnings-release exhibits, investor presentations, capital-structure discussions, credit-facility waivers and listing-status records. Recent Form 8-K reports address financial results and stakeholder discussions involving debt and waiver arrangements, while Form 25 records the removal of the company’s ordinary shares from NYSE listing and the transition of trading to the OTC symbol TSEOF.
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.
Trinseo PLC received an amended ownership report from CastleKnight and related entities. The Schedule 13G/A (Amendment No. 2) shows that CastleKnight Master Fund LP, its affiliated general partners and managers, Weitman Capital LLC, and Aaron Weitman collectively report beneficial ownership of 516,826 ordinary shares, or 1.4% of Trinseo’s ordinary shares.
All reporting persons list zero sole voting and dispositive power and instead report shared voting and shared dispositive power over the same 516,826 shares. They also certify that the securities were not acquired and are not held for the purpose or effect of changing or influencing control of Trinseo, but instead are being reported on a passive basis.
Trinseo PLC amended its Credit Agreement through subsidiaries on February 16, 2026 to extend, until March 19, 2026, the grace period for interest payments due between February 1 and March 1, 2026. This extension is designed to match the grace period available under its second‑lien notes.
Separately, a Trinseo subsidiary elected to use a 30‑day contractual grace period on an approximately $10.0 million interest payment due February 17, 2026 on its 7.625% second lien secured notes due 2029. The company states it has sufficient cash to pay but chose to delay while it continues ongoing discussions with financial stakeholders regarding its capital structure, retaining the right to pay within the grace period before any event of default is triggered.
Trinseo PLC reported a significant institutional shareholder disclosure. Charles Schwab Investment Management Inc., a Delaware-based investment adviser, filed a Schedule 13G stating beneficial ownership of 2,091,125 Ordinary Shares of Trinseo PLC, representing 5.8% of the class as of 12/31/2025.
Schwab reports sole power to vote and dispose of all 2,091,125 shares, with no shared voting or dispositive power. The filing is certified as being made in the ordinary course of business and explicitly notes that the securities were not acquired and are not held for the purpose of changing or influencing control of Trinseo PLC.
Trinseo PLC director reports no share ownership
Trinseo PLC director Carol Flaton filed an initial ownership report stating that no Trinseo securities are beneficially owned. The Form 3 identifies Flaton as a director of Trinseo PLC and confirms there are no non-derivative or derivative securities reported as owned, meaning there are currently no Trinseo shares or related instruments attributed to this insider.
Trinseo PLC director Frizzley Jill Kathleen filed an initial ownership report on Form 3 in connection with an event dated 01/16/2026. The filing identifies her as a director of Trinseo PLC and states that she does not beneficially own any Trinseo securities. Both the non-derivative and derivative tables are effectively empty, and the explanation section explicitly notes that no securities are beneficially owned.