Trinseo adjourns 2026 shareholder meetings to Sept. 30

Q: Who can vote at Trinseo's adjourned annual meeting?

Shareholders of record as of the close of business on July 30, 2026, are entitled to attend or vote at the adjourned annual meeting.

Q: When is Trinseo's adjourned extraordinary general meeting (TSEOQ)?

The meeting is scheduled for September 30, 2026, at 8:45 a.m. EST. Shareholders of record as of August 12, 2026, are entitled to attend.

The annual meeting's proposals remain unchanged, while the extraordinary meeting has no resolutions or substantive matter for action.

Available on EDGAR 09/23/2026 - 01:31 PM EDT Accepted by SEC EDGAR 09/23/2026 - 01:30 PM EDT

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Form Type

8-K

Rhea-AI Filing Summary

Trinseo PLC adjourned its 2026 annual general meeting and extraordinary general meeting on September 23, 2026, after a quorum was not present in person or by proxy. The adjourned annual meeting is scheduled for September 30, 2026, at 8:30 a.m. EST. Shareholders of record as of July 30, 2026, may attend or vote, and the proposals are unchanged.

The adjourned extraordinary general meeting is scheduled for September 30, 2026, at 8:45 a.m. EST. Shareholders of record as of August 12, 2026, may attend. No resolutions are being proposed, and no substantive matter will be presented for a vote or otherwise acted upon.

8-K Event Classification

2 items: 5.07, 8.01

2 items

Item 5.07 Submission of Matters to a Vote of Security Holders Governance

Results of a shareholder vote on proposals at an annual or special meeting.

Item 8.01 Other Events Other

Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

Key Figures

Adjourned annual meeting date: September 30, 2026 Adjourned annual meeting time: 8:30 a.m. EST Annual meeting record date: July 30, 2026 +3 more

6 metrics

Adjourned annual meeting date September 30, 2026 2026 annual general meeting

Adjourned annual meeting time 8:30 a.m. EST September 30, 2026

Annual meeting record date July 30, 2026 Shareholders of record as of the close of business may attend or vote

Adjourned extraordinary meeting date September 30, 2026 2026 extraordinary general meeting

Adjourned extraordinary meeting time 8:45 a.m. EST September 30, 2026

Extraordinary meeting record date August 12, 2026 Shareholders of record as of this date are entitled to attend

Key Terms

quorum, shareholders of record, Adjourned Extraordinary General Meeting

3 terms

quorum regulatory

"failure of a quorum to be present in person or by proxy"

A quorum is the minimum number of members needed to officially hold a meeting or make decisions. It ensures that decisions are made with enough participation to represent the group’s interests, much like a majority must be present for a vote to be valid. For investors, understanding quorum is important because it affects when and how important company or organization decisions can be legally made.

shareholders of record regulatory

"Only shareholders of record as of the close of business"

Shareholders of record are the people officially listed as owners of a company's stock on a specific date. This matters because only these shareholders are entitled to receive dividends or vote at company meetings. It's like being on the official guest list for a party—you get to enjoy the perks and have a say.

Adjourned Extraordinary General Meeting regulatory

"The Adjourned Extraordinary General Meeting will be held"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What happened to Trinseo's 2026 annual general meeting (TSEOQ)?

Trinseo adjourned the meeting after a quorum was not present in person or by proxy. It is scheduled to reconvene on September 30, 2026, at 8:30 a.m. EST, with the proposals unchanged.

Who can vote at Trinseo's adjourned annual meeting?

Shareholders of record as of the close of business on July 30, 2026, are entitled to attend or vote at the adjourned annual meeting.

When is Trinseo's adjourned extraordinary general meeting (TSEOQ)?

The meeting is scheduled for September 30, 2026, at 8:45 a.m. EST. Shareholders of record as of August 12, 2026, are entitled to attend.

Will Trinseo shareholders vote on any matter at the adjourned extraordinary meeting?

No resolutions are being proposed, and no substantive matter will be presented for a vote or otherwise acted upon.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 23, 2026

Trinseo PLC

(Exact name of registrant as specified in its charter)


Ireland	001-36473	N/A
(State or other jurisdiction of incorporation or organization)	(Commission File Number)	(I.R.S. Employer Identification Number)

440 East Swedesford Road, Suite 301,

Wayne, Pennsylvania 19087

(Address of principal executive offices, including zip code)

(610) 240-3200

(Telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of Each Class	Trading symbol(s)	Name of Each Exchange on which registered
Ordinary Shares, par value $0.01 per share	TSEOF	N/A

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐


ITEM 5.07	Submission of Matters to a Vote of Security Holders.

Adjournment of Annual General Meeting

On September 23, 2026, Trinseo PLC (the “Company”) convened its 2026 annual general meeting (the “Annual Meeting”). The Chair of the Annual Meeting adjourned the Annual Meeting to September 30, 2026 at 8:30 a.m. EST (the “Adjourned Annual Meeting”) in accordance with the Company’s constitution due to the failure of a quorum to be present in person or by proxy.

The Adjourned Annual Meeting is currently scheduled to be held at 440 E. Swedesford Rd., Suite 301, Wayne, Pennsylvania 19380, United States (with an audio and video link available for shareholders in Ireland at McCann FitzGerald LLP, Riverside One, Sir John Rogerson’s Quay, Grand Canal Dock, Dublin 2, D02 X576, Ireland at 1:30 p.m. IST). Only shareholders of record as of the close of business on July 30, 2026 are entitled to vote at or attend the Adjourned Annual Meeting. No changes have been made to the proposals that shareholders will vote on at the Adjourned Annual Meeting.

Item 8.01 Other Events.

Adjournment of Extraordinary General Meeting

The Company convened an Extraordinary General Meeting of Shareholders (the “Extraordinary General Meeting”) on September 23, 2026 at 8:45 a.m. EST. The Chair of the Extraordinary General Meeting adjourned the meeting to September 30, 2026, at 8:45 a.m. EST (the “Adjourned Extraordinary General Meeting”) in accordance with the Company’s constitution due to the failure of a quorum to be present in person or by proxy.

The Adjourned Extraordinary General Meeting will be held at 440 E. Swedesford Rd., Suite 301, Wayne, Pennsylvania 19380, United States (with an audio and video link available for shareholders in Ireland at McCann FitzGerald LLP, Riverside One, Sir John Rogerson’s Quay, Grand Canal Dock, Dublin 2, D02 X576, Ireland at 1:45 p.m. IST). Only shareholders of record as of the close of business on August 12, 2026 are entitled to attend the Adjourned Extraordinary General Meeting. As previously disclosed, no resolutions are being proposed at the Adjourned Extraordinary General Meeting, and no substantive matter will be presented for a vote or otherwise acted upon.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	TRINSEO PLC


	By:	/s/ Angelo Chaclas
	Name:	Angelo Chaclas
	Title:	Senior Vice President and Chief Legal Officer

Date: September 23, 2026

Source: View Original Filing on SEC EDGAR

Filing Exhibits & Attachments

3 documents