TSEOQ Form DEFA14A: Additional definitive proxy soliciting materials

Trinseo PLC Form DEFA14A: Additional definitive proxy soliciting materials

Filings on SEC EDGAR, newest first; amendments sit with their base form. Values are as filed.

2026-08-07: Form DEFA14A; Description DEFA14A; Document tse-20231231xdefa14a.htm.
2025-04-29: Form DEFA14A; Description DEFA14A; Document tm2510998d9_defa14a.htm.
2024-04-29: Form DEFA14A; Description DEFA14A; Document tse-20231231xdefa14a.htm.
2023-06-09: Form DEFA14A; Description DEFA14A; Document tm2318313d1_defa14a.htm.

Filed	Form	Description	Document
2026-08-07	DEFA14A	DEFA14A	tse-20231231xdefa14a.htm
2025-04-29	DEFA14A	DEFA14A	tm2510998d9_defa14a.htm
2024-04-29	DEFA14A	DEFA14A	tse-20231231xdefa14a.htm
2023-06-09	DEFA14A	DEFA14A	tm2318313d1_defa14a.htm
2023-05-15	DEFA14A	DEFA14A	tm2315832d1_defa14a.htm
2023-05-02	DEFA14A	DEFA14A	tm231982d6_defa14a.htm
2022-04-25	DEFA14A	DEFA14A	tm223624d4_defa14a.htm
2021-04-27	DEFA14A	DEFA14A	tm219665d4_defa14a.htm
2020-05-07	DEFA14A	DEFA14A	tmb-20200507xdefa14a.htm
2020-04-27	DEFA14A	DEFA14A	tmb-20200427xdefa14a.htm
2019-06-07	DEFA14A	DEFA14A	a19-11272_1defa14a.htm
2019-05-10	DEFA14A	DEFA14A	a19-7993_3defa14a.htm
2018-06-12	DEFA14A	DEFA14A	defa14a.htm
2018-05-31	DEFA14A	DEFA14A	a18-14691_1defa14a.htm
2017-06-12	DEFA14A	DEFA 14A	d277941ddefa14a.htm
2017-06-05	DEFA14A	DEFA14A	d291416ddefa14a.htm
2017-05-19	DEFA14A	DEFA14A	d358120ddefa14a.htm
2017-05-19	DEFA14A	8-K	a17-13839_18k.htm
2017-04-28	DEFA14A	DEFA14A	d386542ddefa14a.htm
2016-05-03	DEFA14A	DEFA14A	a16-8244_4defa14a.htm
2015-05-07	DEFA14A	DEFINITIVE ADDITIONAL MATERIALS	d912254ddefa14a.htm
2015-04-27	DEFA14A	DEFINITIVE ADDITIONAL MATERIALS	d912254ddefa14a.htm