Data spanning the past 90 days through January 13, 2026 reveals that Trinseo's three principal insider shareholders consist of TenPercentOwner Investment Management Ltd M&G (7.63Mn shares), Ceo And President Frank A Bozich (720.97K shares), Svp And Clo And Cco & Corp. Sec. Angelo N. Chaclas (293.19K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Investment Management Ltd M&G | 7,625,044 | 20 Jul, 2022 | |
| Frank A Bozich | Ceo And President | 720,971 | 03 Mar, 2025 |
| Angelo N. Chaclas | Svp And Clo And Cco & Corp. Sec. | 293,193 | 03 Mar, 2025 |
| David Phillip Stasse | Evp And Cfo | 279,853 | 03 Mar, 2025 |
| Matthew Farrell | 250,225 | 14 Aug, 2025 | |
| Jeffrey J Cote | 238,783 | 27 Jun, 2025 | |
| Francesca Reverberi | Svp And Em And Polymer Solutions | 164,131 | 03 Mar, 2025 |
| Paula M. Cooney | Svp And Chro | 136,112 | 03 Mar, 2025 |
| Rainer Schewe | Svp And Supply Chain & Mfg Svcs | 112,556 | 03 Mar, 2025 |
| Kessel Bregje Van | Svp And Corporate Finance & Ir | 111,658 | 03 Mar, 2025 |
| Henri Steinmetz | 95,937 | 27 Jun, 2025 | |
| Joseph Alvarado | 94,671 | 27 Jun, 2025 | |
| Klynne Johnson | 90,913 | 27 Jun, 2025 | |
| Han Hendriks | Svp And Chief Technology Officer | 89,691 | 07 Oct, 2025 |
| Jeanmarie F. Desmond | 89,036 | 27 Jun, 2025 | |
| Sandra Beach Lin | 87,260 | 27 Jun, 2025 | |
| Victoria Brifo | 83,225 | 27 Jun, 2025 | |
| Arthas Bing Yang | Svp And Latex Binders | 54,450 | 03 Mar, 2025 |
| Roger Greene | Vp And Global Controller & Pao | 49,856 | 29 Sep, 2025 |
| Mark E Tomkins | 36,619 | 24 Jun, 2025 | |
| Leener Pierre-Marie De | 36,174 | 24 Jun, 2025 | |
| Donald T Misheff | 19,654 | 13 Jul, 2023 | |
| Andre Lanning | Svp & Cco | 18,145 | 28 Feb, 2023 |
| Timothy J Thomas | Svp And Mfctg & Oper Excellence | 17,737 | 21 Feb, 2024 |
| Johanna Frisch | Vp And Treasurer | 15,898 | 02 Oct, 2025 |
| Nicolas Joly | Svp And Styrenics | 14,928 | 28 Feb, 2023 |
| Bernard M Skeete | Vp And Cao & Global Controller | 12,822 | 28 Feb, 2023 |
| Alice Heezen | Svp Human Resources | 10,081 | 16 Nov, 2021 |
| Philip R Martens | 9,414 | 13 Jul, 2023 | |
| Jean-Luc Beal | Svp And Engineered Materials | 9,254 | 24 Feb, 2023 |
| James Mingyu Ni | Svp And Latex Binders | 6,904 | 21 Feb, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 03 Oct, 2025 | Han Hendriks | Ordinary Shares | D | 2,067 | $2.33 | 89,691 | D | F |
| 30 Sep, 2025 | Johanna Frisch | Ordinary Shares | D | 2,194 | $2.35 | 15,898 | D | F |
| 30 Sep, 2025 | Johanna Frisch | - | - | 15,898 | D | |||
| 25 Sep, 2025 | Roger Greene | - | - | 49,856 | D | |||
| 25 Sep, 2025 | Roger Greene | Ordinary Shares | D | 1,617 | $2.57 | 49,856 | D | F |
| 14 Aug, 2025 | Matthew Farrell | - | - | 250,225 | D | |||
| 14 Aug, 2025 | Matthew Farrell | Ordinary Shares | A | 48,609 | $2.43 | 250,225 | D | P |
| 13 Aug, 2025 | Matthew Farrell | - | - | 201,616 | D | |||
| 13 Aug, 2025 | Matthew Farrell | Ordinary Shares | A | 26,391 | $2.45 | 201,616 | D | P |
| 12 Aug, 2025 | Matthew Farrell | - | - | 175,225 | D | |||
| 12 Aug, 2025 | Matthew Farrell | Ordinary Shares | A | 25,000 | $2.29 | 175,225 | D | P |
| 25 Jun, 2025 | Joseph Alvarado | Ordinary Shares | A | 42,484 | $0.00 | 94,671 | D | A |
| 25 Jun, 2025 | Matthew Farrell | Ordinary Shares | A | 42,484 | $0.00 | 150,225 | D | A |
| 25 Jun, 2025 | Jeffrey J Cote | Ordinary Shares | A | 42,484 | $0.00 | 88,183 | D | A |
| 25 Jun, 2025 | Henri Steinmetz | Ordinary Shares | A | 42,484 | $0.00 | 95,937 | D | A |
| 25 Jun, 2025 | Sandra Beach Lin | Ordinary Shares | A | 42,484 | $0.00 | 87,260 | D | A |
| 25 Jun, 2025 | Klynne Johnson | Ordinary Shares | A | 42,484 | $0.00 | 90,913 | D | A |
| 25 Jun, 2025 | Jeanmarie F. Desmond | Ordinary Shares | A | 42,484 | $0.00 | 89,036 | D | A |
| 25 Jun, 2025 | Victoria Brifo | Ordinary Shares | A | 42,484 | $0.00 | 83,225 | D | A |
| 21 Jun, 2025 | Joseph Alvarado | Ordinary Shares | D | 10,327 | $3.73 | 52,187 | D | F |