Trinseo TSEOQ Insider Ownership

OTC TSEOQ
$0.01 +0.00 (+0.00%)
At close: Sep 8, 2026 · 4:00 PM EDT

Insider Holdings by Owner

10.31Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
—
share count not reported for this filer set
Shares Held by Insiders
94.67K
filed for Sep 2026
■0.00% QoQ
Shares Outstanding
—
not reported
Direct Holdings
94.67K
Indirect: 0
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
31
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

Quarter ending 30 Sep, 2026

Trinseo's top three insider shareholders as of September 09, 2026 are Investment Management Ltd Mg (TenPercentOwner, 7.63Mn shares), Investment Management Ltd Mg (TenPercentOwner, 7.63Mn shares), Frank A Bozich (Ceo And President, 664.69K shares).

Form 4 Holdings

Insiders Holding TSEOQ

Insiders 31
Shares held 10.31Mn
Of outstanding —
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Investment Management Ltd Mg TenPercentOwner 0 7,625,044 7,625,044 73.9% 20 Jul, 2022
2 Frank A Bozich Ceo And President 664,689 0 664,689 6.4% 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 1.1% 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 Joseph Alvarado Director 94,671 0 94,671 0.9% 27 Jun, 2025
11 Jeanmarie F. Desmond Director 89,036 0 89,036 0.9% 27 Jun, 2025
12 Han Hendriks Svp, Chief Technology Officer 73,362 0 73,362 0.7% 03 Mar, 2026
13 Henri Steinmetz Director 53,453 0 53,453 0.5% 14 May, 2026
14 Arthas Bing Yang Svp, Latex Binders 49,457 0 49,457 0.5% 03 Mar, 2026
15 Klynne Johnson Director 48,429 0 48,429 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 Alice Heezen Svp Human Resources 10,081 0 10,081 0.1% 16 Nov, 2021
29 Philip R Martens Director 9,414 0 9,414 0.1% 13 Jul, 2023
30 Jean-Luc Beal Svp, Engineered Materials 9,254 0 9,254 0.1% 24 Feb, 2023
31 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

1,009 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
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 Henri Steinmetz Director Disposed J 42,484 — — 53,453 Direct
12 May, 2026 Klynne Johnson Director Disposed J 42,484 — — 48,429 Direct
12 May, 2026 Matthew Farrell Director Disposed J 42,484 — — 207,741 Direct
12 May, 2026 Victoria Brifo Director Disposed J 42,484 — — 40,741 Direct
12 May, 2026 Jeffrey J Cote Director Disposed J 42,484 — — 45,699 Direct
27 Feb, 2026 Arthas Bing Yang Svp, Latex Binders Disposed F 2,548 $0.23 $586 49,457 Direct
27 Feb, 2026 Francesca Reverberi Svp, Em And Polymer Solutions Disposed F 1,385 $0.23 $319 161,250 Direct
27 Feb, 2026 Arthas Bing Yang Svp, Latex Binders Disposed F 2,548 $0.23 $586 49,457 Direct
27 Feb, 2026 Rainer Schewe Svp, Supply Chain Mfg Svcs Disposed F 4,028 $0.23 $926 103,415 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 Angelo N. Chaclas Svp, Clo, Cco Corp. Sec. Disposed F 7,607 $0.23 $1.75K 274,798 Direct
27 Feb, 2026 Roger Greene Vp, Global Controller Pao Disposed F 2,517 $0.23 $579 45,101 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 Arthas Bing Yang Svp, Latex Binders Disposed F 2,548 $0.23 $586 49,457 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 Kessel Bregje Van Svp, Corporate Finance Ir Disposed F 6,064 $0.23 $1.39K 98,296 Direct
27 Feb, 2026 Arthas Bing Yang Svp, Latex Binders Disposed F 2,548 $0.23 $586 49,457 Direct
27 Feb, 2026 Han Hendriks Svp, Chief Technology Officer Disposed F 7,707 $0.23 $1.77K 73,362 Direct