Trinseo PLC — fact timeline

Trinseo PLC entered into Senior Secured Super-Priority Debtor-In-Possession HoldCo Credit Agreement with Alter Domus (US) LLC, as administrative agent and collateral agent, and the lenders party thereto valued at $157.5 million (effective 2026-05-28).

“On May 28, 2026, the Company, as parent, Trinseo NA Finance LLC, as holdings, Trinseo Luxco Finance SPV S.à r.l. and Trinseo NA Finance SPV LLC (together, the “ SHC Borrowers ”), as borrowers, the guarantors party thereto from time to time, the lenders party thereto from time to time (the “ SHC DIP Lenders ”), and Alter Domus (US) LLC, as administrative agent and collateral agent, entered into a Senior Secured Super-Priority Debtor-In-Possession HoldCo Credit Agreement (the “ Super-Holdco DIP Credit Agreement ”), providing for a senior secured super-priority priming term loan debtor-in-possession credit facility in an aggregate principal amount of $157.5 million (the “ Super-Holdco DIP Facility ”).”

Trinseo PLC entered into Senior Secured Super-Priority Debtor-In-Possession Credit Agreement with Deutsche Bank AG New York Branch, as administrative agent and collateral agent, and the lenders party thereto valued at $270.0 million (effective 2026-05-28).

“On May 28, 2026, Trinseo Luxco S.à r.l., as holdings, Trinseo Holding S.à r.l. and Trinseo Materials Finance, Inc. (together, the “ OpCo Borrowers ”), as borrowers, the guarantors party thereto from time to time, the lenders party thereto from time to time (the “ OpCo DIP Lenders ”), and Deutsche Bank AG New York Branch, as administrative agent and collateral agent, entered into a Senior Secured Super-Priority Debtor-In-Possession Credit Agreement (the “ OpCo DIP Credit Agreement ”), providing for a senior secured super-priority priming term loan debtor-in-possession credit facility in an aggregate principal amount of $270.0 million (the “ OpCo DIP Facility ”).”

Trinseo PLC entered chapter 11 in United States Bankruptcy Court for the Southern District of Texas, Houston Division (petition 2026-05-26).

“On May 26, 2026 (the “ Petition Date ”), the Debtors filed voluntary petitions (the “ Chapter 11 Cases ”) under Chapter 11 of the Bankruptcy Code in the United States Bankruptcy Court for the Southern District of Texas, Houston Division (the “ Bankruptcy Court ”)”

Trinseo PLC entered into Restructuring Support Agreement with Supporting Super HoldCo 1L Lenders, Supporting RCF Lenders, Supporting OpCo 2028 Term Lenders (effective 2026-05-13).

“on May 13, 2026, the Company Parties entered into the Restructuring Support Agreement with: · Supporting Super HoldCo 1L Lenders holding approximately 98.0% of the aggregate outstanding principal amount of Super HoldCo 1L Claims under the Credit Agreement dated September 8, 2023 (as amended, the “ Super HoldCo 1L Credit Agreement ”) and 100% of the OpCo Intercompany Term Loans; · Supporting RCF Lenders holding approximately 100% of the aggregate outstanding principal amount of RCF Claims under the Credit Agreement dated January 17, 2025 (as amended, the “ RCF Credit Agreement ”); and · Supporting OpCo 2028 Term Lenders holding approximately 57.2% of the aggregate outstanding principal amount of OpCo 2028 Term Loan Claims under the Credit Agreement dated September 6, 2017 (as amended, the “ OpCo Term Loan Credit Agreement ”).”

Trinseo PLC reported financial results for first quarter and year ended March 31, 2026.

“On April 30, 2026, Trinseo PLC, a public limited company existing under the laws of Ireland (the “Company”), issued a press release announcing its financial results for the first quarter and year ended March 31, 2026.”

Trinseo PLC amended a credit facility (effective 2026-05-14).

“As permitted by the waiver under the Company’s super-priority revolving credit facility dated January 17, 2025, the counterparties confirmed the extension of such waiver’s expiration date until May 13, 2026.”

Trinseo PLC amended Second Amendment with Deutsche Bank AG New York Branch valued at $50,000,000 (effective 2026-04-10).

“On April 10, 2026, Trinseo Luxco S.à r.l. (“Trinseo Luxco”), Trinseo Holding, Trinseo Materials Finance, Inc. (together with Trinseo Holding, the “Borrowers”), Trinseo Ireland Global IHB Limited, and Trinseo Services Ireland Limited, direct and indirect wholly owned subsidiaries of the Company, entered into an amendment (the “Second Amendment”) to the credit agreement governing our super-priority revolving credit facility dated, January 17, 2025 (as amended, the “SuperPriority Revolver”), by and among Trinseo Luxco, the Borrowers, the guarantors party thereto from time to time, the lenders party thereto from time to time, and Deutsche Bank AG New York Branch, as administrative agent and collateral agent, pursuant to which, among other things, (i) the requisite amount of lenders thereunder agreed to, among other things, amend certain definitions, covenants and provisions thereunder, and (ii) certain lenders agreed to provide incremental senior secured revolving credit commitments (the “”

Trinseo PLC amended Securitization Waiver with KKR Credit Advisors (US) LLC, GLAS USA LLC, GLAS Americas LLC (effective 2026-04-10).

“On April 10, 2026 (the “Closing Date”), Trinseo Ireland Global IHB Limited (the “Investment Manager”), Trinseo Holding S.à r.l. (“Trinseo Holding”), and Styron Receivables Funding Designated Activity Company (the “Borrower”), direct and indirect wholly owned subsidiaries of the Company, entered into an amendment and limited waiver (the “Securitization Waiver”) to the Credit and Security Agreement, dated as of July 18, 2024, governing our accounts receivable securitization facility”

Trinseo PLC entered into Securitization Waiver with GLAS USA LLC valued at Amendment and limited waiver to accounts receivable securitization facility temporarily waiving cert (effective 2026-03-19).

“On March 19, 2026, Trinseo Ireland Global IHB Limited, an indirect wholly owned subsidiary of the Company, Trinseo Holding, and Styron Receivables Funding Designated Activity Company, entered into an amendment and limited waiver (the "Securitization Waiver") to the Credit and Security Agreement dated July 18, 2024 governing our accounts receivable securitization facility (the “Accounts Receivable Securitization Facility”) by and among Trinseo Ireland Global IHB Limited, Trinseo Holding, Styron Receivables Funding Designated Activity Company, GLAS USA LLC, as administrative agent, GLAS Americas LLC, as collateral agent, and the lenders party thereto, pursuant to which, among other things, the requisite amount of lenders thereunder agreed to (i) temporarily waive certain acceleration and collateral enforcement rights and remedies under such facility until April 2, 2026, as a result of the nonpayment of interest or principal beyond the applicable grace period under the Senior Credit Agree”

Trinseo PLC entered into Refinance Credit Facility Waiver with Alter Domus (US) LLC valued at Amendment and limited waiver to Refinance Credit Agreement temporarily waiving certain acceleration (effective 2026-03-19).

“On March 19, 2026, Trinseo NA Finance LLC (“NA Finance”), Trinseo LuxCo Finance SPV S.à r.l. (“LuxCo Finance SPV”) and Trinseo NA Finance SPV LLC (“NA Finance SPV”), direct and indirect wholly owned subsidiaries of the Company, entered into an amendment and limited waiver (the “Refinance Credit Facility Waiver”) to that certain Credit Agreement, dated as of September 8, 2023 (as amended, the “Refinance Credit Agreement”), by and among NA Finance, LuxCo Finance SPV and NA Finance SPV, the Company and Alter Domus (US) LLC, as administrative agent and collateral agent, pursuant to which, among other things, the requisite amount of lenders thereunder agreed to (i) temporarily waive certain acceleration and collateral enforcement rights and remedies under such facility until April 30, 2026, as a result of the nonpayment of interest or principal beyond the applicable grace period under the Refinance Credit Agreement, the Senior Credit Agreement, and the 2L Notes Indenture, and other related”

Trinseo PLC entered into Senior Credit Facility Waiver with Deutsche Bank AG New York Branch valued at Amendment and limited waiver to Senior Credit Agreement temporarily waiving certain acceleration and (effective 2026-03-19).

“On March 19, 2026, Trinseo Luxco, the Borrowers, and the lenders party thereto, entered into an amendment and limited waiver (the “Senior Credit Facility Waiver”) to that certain Credit Agreement, dated as of September 6, 2017 (as amended, the “Senior Credit Agreement”), by and among Trinseo Luxco, the Borrowers, the guarantors party thereto from time to time, the lenders party thereto from time to time, and Deutsche Bank AG New York Branch, as administrative agent and collateral agent, pursuant to which, among other things, the requisite amount of lenders thereunder agreed to (i) temporarily waive certain acceleration and collateral enforcement rights and remedies under such facility until April 30, 2026, as a result of the nonpayment of interest or principal beyond the applicable grace period under the Senior Credit Agreement, the Refinance Credit Agreement, and the 2L Notes Indenture, and other related notice and cross-defaults, (ii) amend certain financial reporting and notice cove”

Trinseo PLC entered into Revolver Waiver with Deutsche Bank AG New York Branch valued at Amendment and limited waiver to SuperPriority Revolver temporarily waiving certain acceleration and (effective 2026-03-19).

“On March 19, 2026, we also entered into an amendment and limited waiver to the SuperPriority Revolver (the “Revolver Waiver”), pursuant to which, among other things, the lenders thereunder agreed to (i) temporarily waive certain acceleration and collateral enforcement rights and remedies under such facility until April 30, 2026, as a result of the nonpayment of interest or principal beyond the applicable grace period under the Senior Credit Agreement (as defined below), the Refinance Credit Agreement (as defined below), and the indenture governing Trinseo LuxCo Finance SPV S.à r.l.’s 7.625% second lien secured notes due 2029 (the “2L Notes” and such indenture, the “2L Notes Indenture”), and other related notice and cross-defaults, and (ii) amend certain other provisions thereunder.”

Trinseo PLC entered into Revolver Amendment with Deutsche Bank AG New York Branch valued at Amendment to super-priority revolving credit facility dated January 17, 2025 (effective 2026-03-19).

“On March 19, 2026, Trinseo Luxco S.à r.l. (“Trinseo Luxco”), Trinseo Holding S.à r.l. (“Trinseo Holding”) and Trinseo Materials Finance, Inc. (together with Trinseo Holding, the “Borrowers”), direct and indirect wholly owned subsidiaries of Trinseo PLC, entered into an amendment (the “Revolver Amendment”) to our super-priority revolving credit facility dated January 17, 2025 (as amended, the “SuperPriority Revolver”) by and among Trinseo Luxco, the Borrowers, the guarantors party thereto from time to time, the lenders party thereto from time to time, and Deutsche Bank AG New York Branch, as administrative agent and collateral agent”

Trinseo PLC reported Year Ended December 31, 2025 results: revenue $ 2,975, net income (546), EPS (15.24).

“Three Months Ended ​ Year Ended ​ ​ December 31, ​ December 31, $millions, except per share data ​ 2025 ​ ​ ​ 2024 ​ ​ ​ 2025 ​ ​ ​ 2024 Net Sales ​ ​ ​ $ 663 ​ ​ ​ $ 821 ​ ​ ​ $ 2,975 ​ ​ ​ $ 3,513 Net Loss ​ (251) ​ (118) ​ ​ (546) ​ ​ (349) Diluted EPS ($) ​ (6.98) ​ (3.33) ​ ​ (15.24) ​ ​ (9.86)”

Trinseo PLC reported Three Months Ended December 31, 2025 results: revenue $ 663, net income (251), EPS (6.98).

“Three Months Ended ​ Year Ended ​ ​ December 31, ​ December 31, $millions, except per share data ​ 2025 ​ ​ ​ 2024 ​ ​ ​ 2025 ​ ​ ​ 2024 Net Sales ​ ​ ​ $ 663 ​ ​ ​ $ 821 ​ ​ ​ $ 2,975 ​ ​ ​ $ 3,513 Net Loss ​ (251) ​ (118) ​ ​ (546) ​ ​ (349) Diluted EPS ($) ​ (6.98) ​ (3.33) ​ ​ (15.24) ​ ​ (9.86)”

Trinseo PLC received a nyse delisting notice notice regarding minimum bid price (rules 802.01C).

“ive 30 trading-day period was less than $50 million and, at the same time, its stockholders’ equity was less than $50 million. In addition, the Company also received written notice from the NYSE indicating that it was not in compliance with the NYSE’s continued listing standard set forth in Section 802.01C because its average closing share price had fallen below $1.00 per share for 30 consecutive trading days. ​ As stated in the Notice, the NYSE will file a Form 25 with the SEC to delist the Company’s ordinary shares from the NYSE upon completion of applicable procedures. The delisting will be”

Trinseo PLC received a nyse delisting notice notice regarding other (rules 802.01B).

““Company”) received written notice (the “Notice”) from the New York Stock Exchange (the “NYSE”) that the NYSE had determined to commence proceedings to delist the Company’s ordinary shares. As stated in the Notice, the NYSE reached its decision to delist the Company’s securities pursuant to Section 802.01B of the NYSE Listed Company Manual because the Company had fallen below the NYSE continued listing standard requiring listed companies to maintain an average market capitalization over a 30-trading day period of at least $15 million. The Notice also stated that trading in the Company’s ordina”

Trinseo PLC amended Credit Agreement (effective 2026-02-16).

“On February 16, 2026, in connection with ongoing discussions with its financial stakeholders, Trinseo Luxco S.à r.l. (“Trinseo Luxco”), Trinseo Holding S.à r.l. ( “Trinseo Holding”) and Trinseo Materials Finance, Inc. (together with Trinseo Holding, the “Borrowers”), direct and indirect wholly owned subsidiaries of Trinseo PLC (the “Company”), and the lenders party thereto, entered into an amendment (the “Amendment”) to that certain Credit Agreement, dated as of September 6, 2017 (as amended, the “Credit Agreement”), by and among Trinseo Luxco, the Borrowers, the guarantors party thereto from time to time, the lenders party thereto from time to time, and Deutsche Bank AG New York Branch, as administrative agent and collateral agent.”

Trinseo PLC received a nyse deficiency notice notice regarding minimum bid price (rules 802.01C).

“December 12, 2025 Trinseo PLC (the “Company”) received a notice (the “Notice”) from the New York Stock Exchange (the “NYSE”) indicating the Company is not currently in compliance with two of the NYSE’s continued listing standards (the “Listing Standards”). ​ First, the Notice indicated that the Company was not currently in compliance with the Listing Standard set forth in Section 802.01B of the NYSE’s Listed Company Manual (the “Minimum Market Capitalization Standard”) due to the fact that the Company’s average global market capitalization over a consecutive 30 trading-day period was less than”

Trinseo PLC received a nyse deficiency notice notice regarding market value (rules 802.01B).

“December 12, 2025 Trinseo PLC (the “Company”) received a notice (the “Notice”) from the New York Stock Exchange (the “NYSE”) indicating the Company is not currently in compliance with two of the NYSE’s continued listing standards (the “Listing Standards”). ​ First, the Notice indicated that the Company was not currently in compliance with the Listing Standard set forth in Section 802.01B of the NYSE’s Listed Company Manual (the “Minimum Market Capitalization Standard”) due to the fact that the Company’s average global market capitalization over a consecutive 30 trading-day period was less than”

Trinseo PLC announced a restructuring with charges of $30 million to $40 million affecting polystyrene ("PS") production operations in Schkopau, Germany with consolidation of remaining PS operations in Tessenderlo, Belgium.

“Germany with consolidation of remaining PS operations in Tessenderlo, Belgium (the “PS Restructuring Plan”). The Company expects to record total pre-tax restructuring charges of $30 million to $40 million, principally comprised of $3 million to $5 million of employee-related costs, $10 million to $14 million of asset-related charges and $15 million to $21 million”

Trinseo PLC announced a restructuring with charges of $80 million to $100 million affecting MMA production operations in Rho, Italy and ACH production operations in Porto Marghera, Italy.

“assets. Moving forward, the company will source all MMA feedstock from third-party producers. ​ The Company expects to record total pre-tax restructuring charges of $80 million to $100 million, principally comprised of $3 million to $6 million of employee-related costs, $40 million to $46 million of asset-related charges and $37 million to $48 million”

Mark Tomkins departed as Director at Trinseo PLC.

“Pierre-Marie De Leener and Mark Tomkins, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2025 annual general meeting of shareholders.”

Pierre-Marie De Leener departed as Director at Trinseo PLC.

“Pierre-Marie De Leener and Mark Tomkins, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2025 annual general meeting of shareholders.”

Trinseo PLC announced a restructuring with charges of $76 million to $97 million affecting Engineered Materials, Plastics Solutions and Polystyrene businesses; Stade, Germany polycarbonate plant (a reduction in workforce of supporting functions).

“In connection with the Stade Shutdown and the 2024 Restructuring Plan, the Company expects to record total pre-tax restructuring charges of $76 million to $97 million, principally comprised of approximately $21 million to $26 million related to decommissioning and demolition costs, approximately $27 million to $31 million of contract terminations and other costs, and approximately $25 million to $26 million related to severance and related benefit costs. Additionally, asset-related charges of approximately $3 million to $14 million will also be incurred as determined by the outcome of the Deepak transaction.”

Trinseo PLC announced a restructuring with charges of $23 million to $28 million affecting Engineered Materials, Plastics Solutions and Polystyrene businesses and Stade, Germany production facility.

“functions and (iii) exit of virgin polycarbonate production at its Stade, Germany production facility. The Company expects to record total pre-tax restructuring charges of $23 million to $28 million, principally comprised of $22 million to $26 million of severance and related benefit costs and $1 million to $2 million of asset-related and contract termination”

Trinseo PLC reported financial results for the first quarter ended March 31, 2024.

“On May 8, 2024, Trinseo PLC, a public limited company existing under the laws of Ireland (the "Company"), issued a press release announcing its financial results for the first quarter ended March 31, 2024.”

Trinseo PLC amended debt of $150.0 million with HSBC Bank plc at 1.65% on outstanding borrowings plus variable commercial paper or other benchmar maturing November 18, 2025.

“reland Global IHB Limited, an indirect wholly owned subsidiary of Trinseo PLC (the “Company”) entered into an Deed of Amendment, Restatement and Accession with Styron Receivables Funding Designated Activity Company, Regency Assets Designated Activity Company, HSBC Bank plc, TMF Administration Services Limited and The Law Debenture Trust Corporation P.L.C.”

Trinseo PLC amended Deed of Amendment, Restatement and Accession with Styron Receivables Funding Designated Activity Company, Regency Assets Designated Activity Company, HSBC Bank plc, TMF Administration Services Limited, The Law Debenture Trust Corporation P.L.C. valued at $150,000,000 borrowing limit, fixed interest charges 1.65% then 3.5% (effective 2024-03-28).

“On March 28, 2024, Trinseo Ireland Global IHB Limited, an indirect wholly owned subsidiary of Trinseo PLC (the “Company”) entered into an Deed of Amendment, Restatement and Accession with Styron Receivables Funding Designated Activity Company, Regency Assets Designated Activity Company, HSBC Bank plc, TMF Administration Services Limited and The Law Debenture Trust Corporation P.L.C. and other indirect wholly owned subsidiaries of the Company named therein (the “Deed of Amendment”).”

Trinseo PLC reported year ended December 31, 2023 results: revenue 3675, net income -701, EPS -19.88.

“​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Year Ended ​ ​ December 31, ​ December 31, $millions, except per share data ​ 2023 2022 2023 2022 Net Sales $ 837 $ 975 $ 3,675 $ 4,966 Net Loss from continuing operations ​ (265) ​ (364) ​ ​ (701) ​ ​ (428) Diluted EPS from continuing operations ($) ​ (7.53) ​ (10.42) ​ ​ (19.88) ​ ​ (11.91) Adjusted Net”

Trinseo PLC reported fourth quarter ended December 31, 2023 results: revenue 837, net income -265, EPS -7.53.

“gas hedging ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended ​ Year Ended ​ ​ December 31, ​ December 31, $millions, except per share data ​ 2023 2022 2023 2022 Net Sales $ 837 $ 975 $ 3,675 $ 4,966 Net Loss from continuing operations ​ (265) ​ (364) ​ ​ (701) ​ ​ (428) Diluted EPS from continuing operations ($) ​ (7.53) ​ (10.42) ​ ​ (19.88) ​ ​ (11.91)”

Trinseo PLC reported Full-year 2023 results: net income $509 million to $499 million. Guidance lowered.

“Full-year 2023 net loss from continuing operations of $509 million to $499 million and Adjusted EBITDA of $175 million to $185 million (prior outlook of net loss from continuing operations of approximately $460 million and Adjusted EBITDA of approximately $215 million†).”

Trinseo PLC announced a restructuring with charges of $58 million to $68 million affecting Terneuzen, the Netherlands styrene plant.

“plant, decommission the styrene plant assets, as well as related workforce reductions. These additional actions are expected to result in estimated restructuring charges of $58 million to $68 million, consisting of approximately $19 million to $21 million of asset-related charges, primarily for accelerated depreciation; approximately $20 million to $23 million”

David Stasse changed role as Executive Vice President and Chief Financial Officer at Trinseo PLC.

“David Stasse, the Company’s Executive Vice President and Chief Financial Officer, will no longer serve as interim principal accounting officer following Mr. Greene’s appointment.”

Roger Greene was appointed as Vice President, Controller and Principal Accounting Officer at Trinseo PLC.

“On September 21, 2023, Trinseo PLC (the “Company”) appointed Roger Greene, age 47, as Vice President, Controller and Principal Accounting Officer of the Company, effective September 25, 2023.”

Trinseo PLC entered into Credit Agreement with Alter Domus (US) LLC valued at senior secured term loan facility of $1,077 million (effective 2023-09-08).

“On September 8, 2023 (the "Closing Date"), Trinseo Luxco Finance SPV S.á r.l., (the "Lux Borrower"), an indirect wholly owned subsidiary of Trinseo PLC (the "Company"), and Trinseo NA Finance SPV LLC, an indirect wholly owned subsidiary of the Company (the "Co-Borrower" and, together with the Lux Borrower, the "Borrowers") entered into a Credit Agreement (the "Credit Agreement") as co-borrowers, with Trinseo Luxco S.á r.l. ("Parent") and Trinseo NA Finance LLC (together with Parent, the "Guarantors"), the lenders party thereto from time to time, and Alter Domus (US) LLC, as administrative agent and collateral agent.”

Trinseo PLC announced a restructuring with charges of approximately $22 million to $27 million affecting PMMA sheet network, primarily in Europe, Bronderslev (Denmark) plant, Belen (New Mexico) plant, Rho (Italy) plant, and general & administrative network (approximately $10 million to $12 million of severance benefits to affected employees).

“is expected to be substantially completed by the end of 2024. The Company expects to incur total restructuring charges in connection with the Plan ranging from approximately $22 million to $27 million. The total charges will consist of approximately $10 million to $12 million of severance benefits to affected employees; approximately $8 million to $9 million of”

David Stasse changed role as Chief Financial Officer (interim principal accounting officer) at Trinseo PLC.

“David Stasse, the Company’s Chief Financial Officer, will serve as the Company’s interim principal accounting officer until Mr. Skeete’s successor is appointed.”

Bernard Skeete resigned as Vice President and Chief Accounting Officer at Trinseo PLC.

“On July 20, 2023, Bernard Skeete informed Trinseo PLC (the “Company”) of his decision to resign from his position as Vice President and Chief Accounting Officer of the Company to pursue a new opportunity, effective August 4, 2023.”

Andre Lanning was terminated as Senior Vice President and Chief Operating Officer at Trinseo PLC.

“On July 18, 2023, Trinseo PLC (the “Company”) announced that Andre Lanning, the Company’s Senior Vice President and Chief Operating Officer would be terminated in connection with a reorganization of the Company’s executive leadership team.”

Trinseo PLC shareholders approved Approval of Amendment to Omnibus Incentive Plan at the 2023-06-14 meeting.

“The Company’s shareholders approved the amendment to the Company’s Omnibus Incentive Plan, by the votes set forth in the table below. The amended Omnibus Incentive Plan is attached hereto as Exhibit 10.1 . ​ For Against Abstain Broker Non-Votes 21,308,657 6,809,553 30,403 2,614,559”

Trinseo PLC shareholders approved Approval of Price Range for Re-issuance of Treasury Shares at the 2023-06-14 meeting.

“The Company’s shareholders approved the price range for the Company’s re-issuance of treasury shares, as described in the proxy statement, by the votes set forth in the table below: ​ For Against Abstain 30,577,734 156,343 29,095”

Trinseo PLC shareholders approved Approval of Authority to Opt Out of Statutory Pre-emption Rights at the 2023-06-14 meeting.

“The Company’s shareholders approved the authority of the Company’s Board of Directors to opt out of statutory pre-emption rights, with respect to up to 10% of issued share capital, by the votes set forth in the table below: ​ ​ For Against Abstain 30,532,641 201,204 29,327”

Trinseo PLC shareholders approved Approval of Authority to Issue Shares at the 2023-06-14 meeting.

“The Company’s shareholders approved the grant of authority of the Company’s Board of Directors to issue shares, by the votes set forth in the table below: For Against Abstain 30,137,502 612,864 12,806”

Trinseo PLC shareholders approved Ratification of the Appointment of the Company's Independent Registered Public Accounting Firm at the 2023-06-14 meeting.

“The Company’s shareholders ratified the audit committee’s appointment of PricewaterhouseCoopers LLP to be the Company’s independent registered public accounting firm for the year ending December 31, 2023, and to authorize, by binding vote, the Audit Committee of the Board to set its auditors’ remuneration by the votes set forth in the table below: ​ For Against Abstain 30,514,060 245,323 3,789”

Trinseo PLC shareholders approved Approval, on an Advisory Basis, of the Company's Named Executive Officers Compensation at the 2023-06-14 meeting.

“The Company’s shareholders approved, on an advisory basis, the compensation paid to the Company’s named executive officers by the votes set forth in the table below: ​ For Against Abstain Broker Non-Votes 26,802,766 1,310,850 34,997 2,614,559”

Trinseo PLC shareholders approved Election of Eleven Directors at the 2023-06-14 meeting.

“The Company’s shareholders approved the election of eleven director nominees to serve a term expiring at the end of the 2024 annual general meeting of shareholders by the votes set forth in the table below: ​ ​ ​ ​ ​ Name For Against Abstain Broker Non-Votes K’Lynne Johnson 27,542,299 583,967 22,347 2,614,559 Joseph Alvarado 27,422,118 713,440 13,055 2,614,559 Frank Bozich 27,892,015 216,875 39,723 2,614,559 Victoria Brifo 27,881,430 254,747 12,436 2,614,559 Jeffrey Cote 27,922,531 213,542 12,540 2,614,559 Pierre-Marie De Leener 27,884,431 251,636 12,546 2,614,559 Jeanmarie Desmond 27,910,976 225,189 12,448 2,614,559 Matthew Farrell 27,889,955 246,091 12,567 2,614,559 Sandra Beach Lin 27,638,185 497,878 12,550 2,614,559 Henri Steinmetz 27,911,470 216,675 20,468 2,614,559 Mark Tomkins 27,641,973 494,076 12,564 2,614,559”

Trinseo PLC reported first quarter ended March 31, 2023 results: revenue $996, net income $(49), EPS $(1.40).

“Three Months Ended ​ ​ March 31, $millions, except per share data ​ 2023 2022 Net Sales $ 996 $ 1,387 Net Income (Loss) from continuing operations ​ (49) ​ 17 Diluted EPS from continuing operations ($) ​ (1.40) ​ 0.45”

Philip Martens departed as Director at Trinseo PLC.

“On April 13, 2023, Donald Misheff and Philip Martens, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2023 annual general meeting of shareholders.”

Donald Misheff departed as Director at Trinseo PLC.

“On April 13, 2023, Donald Misheff and Philip Martens, two members of the Board of Directors (the “Board”) of Trinseo PLC (the “Company”), notified the Company of their decision to retire from the Board and not stand for reelection at the Company’s 2023 annual general meeting of shareholders.”