Trinseo TSEOQ Insider Ownership

OTC TSEOQ

$0.00 +0.00 (+0.00%)

At close: Oct 19, 2026 · 4:00 PM EDT

Insider Holdings by Owner

10.22Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

7.22%

■0% pp QoQ

Shares Held by Insiders

2.64Mn

filed for Sep 2026

■0.00% QoQ

Shares Outstanding

36.60Mn

36,600,000 shares

Direct Holdings

2.47Mn

Indirect: 170.50K

Net Shares Traded (QoQ)

no net change in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 8, 2026

Over the past 12 months, Trinseo insiders made no open-market purchases or sales of the stock.

Beyond open-market trades, insiders at Trinseo gave up 169K shares to cover taxes or exercise prices in the last 12 months.
Business Quant data shows Trinseo insiders holding 2.64Mn shares in total in their latest Form 4 filings, unchanged from 2.64Mn shares at the end of Q2 2026 and down 16.85% from 3.18Mn shares at the end of Q3 2025.
Indirect holdings, through trusts, partnerships, family members and other entities, make up 6.45% (170.5K shares) of Trinseo's insider total, with the other 93.55% (2.47Mn shares) held directly.
Holdings in Trinseo stock are reported by 21 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
TSEOQ's three largest insider shareholders, per their latest Form 4 filings, are Frank A. Bozich (CEO and President, 664.69K shares), Angelo N. Chaclas (SVP, CLO, CCO & Corporate Secretary, 274.8K shares) and David Phillip Stasse (EVP and CFO, 254.79K shares).
The largest insider, Frank A. Bozich, holds 25.16% of TSEOQ's insider total.
Institutions held 1.26% of Trinseo's outstanding shares in their Q2 2026 13F filings.
Over the trailing 12 months, 18 insiders reported transactions in TSEOQ stock across 28 Form 4 filings.
These insider figures for Trinseo are based on Form 4 filings through May 14, 2026.

Form 4 Holdings

Insiders Holding TSEOQ

Insiders 30

Shares held 10.22Mn

Of outstanding 27.91%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Investment Management Ltd Mg	TenPercentOwner	0	7,625,044	7,625,044	74.6%	20 Jul, 2022
2	Frank A Bozich	Ceo And President	664,689	0	664,689	6.5%	03 Mar, 2026
3	Angelo N. Chaclas	Svp, Clo, Cco Corp. Sec.	274,798	0	274,798	2.7%	03 Mar, 2026
4	David Phillip Stasse	Evp And Cfo	254,788	0	254,788	2.5%	03 Mar, 2026
5	Matthew Farrell	Director	207,741	0	207,741	2.0%	14 May, 2026
6	Francesca Reverberi	Svp, Em And Polymer Solutions	161,250	0	161,250	1.6%	03 Mar, 2026
7	Paula M. Cooney	Svp, Chro	118,318	0	118,318	1.2%	03 Mar, 2026
8	Rainer Schewe	Svp, Supply Chain Mfg Svcs	103,415	0	103,415	1.0%	03 Mar, 2026
9	Kessel Bregje Van	Svp, Corporate Finance Ir	98,296	0	98,296	1.0%	03 Mar, 2026
10	Han Hendriks	Svp, Chief Technology Officer	73,362	0	73,362	0.7%	03 Mar, 2026
11	Henri Steinmetz	Director	53,453	0	53,453	0.5%	14 May, 2026
12	Joseph Alvarado	Director	52,187	0	52,187	0.5%	14 May, 2026
13	Arthas Bing Yang	Svp, Latex Binders	49,457	0	49,457	0.5%	03 Mar, 2026
14	Klynne Johnson	Director	48,429	0	48,429	0.5%	14 May, 2026
15	Jeanmarie F. Desmond	Director	46,552	0	46,552	0.5%	14 May, 2026
16	Jeffrey J Cote	Director	45,699	0	45,699	0.4%	14 May, 2026
17	Roger Greene	Vp, Global Controller Pao	45,101	0	45,101	0.4%	03 Mar, 2026
18	Sandra Beach Lin	Director	44,776	0	44,776	0.4%	14 May, 2026
19	Victoria Brifo	Director	40,741	0	40,741	0.4%	14 May, 2026
20	Mark E Tomkins	Director	36,619	0	36,619	0.4%	24 Jun, 2025
21	Leener Pierre-Marie De	Director	36,174	0	36,174	0.4%	24 Jun, 2025
22	Nicolas Joly	Svp, Styrenics	25,984	0	25,984	0.3%	28 Feb, 2023
23	Donald T Misheff	Director	19,654	0	19,654	0.2%	13 Jul, 2023
24	Andre Lanning	Svp Cco	18,145	0	18,145	0.2%	28 Feb, 2023
25	Timothy J Thomas	Svp, Mfctg Oper Excellence	17,737	0	17,737	0.2%	21 Feb, 2024
26	Johanna Frisch	Vp And Treasurer	15,898	0	15,898	0.2%	02 Oct, 2025
27	Bernard M Skeete	Vp, Cao Global Controller	12,822	0	12,822	0.1%	28 Feb, 2023
28	Philip R Martens	Director	9,414	0	9,414	0.1%	13 Jul, 2023
29	Jean-Luc Beal	Svp, Engineered Materials	9,254	0	9,254	0.1%	24 Feb, 2023
30	James Mingyu Ni	Svp, Latex Binders	6,904	0	6,904	0.1%	21 Feb, 2024

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

921 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
12 May, 2026	Sandra Beach Lin	Director	Disposed J	42,484	—	—	44,776	Direct
12 May, 2026	Klynne Johnson	Director	Disposed J	42,484	—	—	48,429	Direct
12 May, 2026	Jeffrey J Cote	Director	Disposed J	42,484	—	—	45,699	Direct
12 May, 2026	Jeanmarie F. Desmond	Director	Disposed J	42,484	—	—	46,552	Direct
12 May, 2026	Victoria Brifo	Director	Disposed J	42,484	—	—	40,741	Direct
12 May, 2026	Matthew Farrell	Director	Disposed J	42,484	—	—	207,741	Direct
12 May, 2026	Joseph Alvarado	Director	Disposed J	42,484	—	—	52,187	Direct
12 May, 2026	Henri Steinmetz	Director	Disposed J	42,484	—	—	53,453	Direct
27 Feb, 2026	Rainer Schewe	Svp, Supply Chain Mfg Svcs	Disposed F	4,028	$0.23	$926	103,415	Direct
27 Feb, 2026	Frank A Bozich	Ceo And President	Disposed F	23,680	$0.23	$5.45K	664,689	Direct
27 Feb, 2026	Angelo N. Chaclas	Svp, Clo, Cco Corp. Sec.	Disposed F	7,607	$0.23	$1.75K	274,798	Direct
27 Feb, 2026	Kessel Bregje Van	Svp, Corporate Finance Ir	Disposed F	6,064	$0.23	$1.39K	98,296	Direct
27 Feb, 2026	David Phillip Stasse	Evp And Cfo	Disposed F	10,366	$0.23	$2.38K	254,788	Direct
27 Feb, 2026	Paula M. Cooney	Svp, Chro	Disposed F	7,670	$0.23	$1.76K	118,318	Direct
27 Feb, 2026	Francesca Reverberi	Svp, Em And Polymer Solutions	Disposed F	1,385	$0.23	$319	161,250	Direct
27 Feb, 2026	Han Hendriks	Svp, Chief Technology Officer	Disposed F	7,707	$0.23	$1.77K	73,362	Direct
27 Feb, 2026	Arthas Bing Yang	Svp, Latex Binders	Disposed F	2,548	$0.23	$586	49,457	Direct
27 Feb, 2026	Roger Greene	Vp, Global Controller Pao	Disposed F	2,517	$0.23	$579	45,101	Direct
21 Feb, 2026	Kessel Bregje Van	Svp, Corporate Finance Ir	Disposed F	5,963	$0.33	$1.95K	105,695	Direct
21 Feb, 2026	David Phillip Stasse	Evp And Cfo	Disposed F	5,028	$0.33	$1.65K	274,825	Direct

Showing 1 to 20 of 921 transactions