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Trinseo PLC (TSEOQ) · Insider trading

What Trinseo's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months
$0
0 insiders, 0 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
$0
bought less sold
Latest filing
2026-05-14
filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

2025-01 2025-03: $15,708 bought 2025-07 2025-08: $240,028 bought 2026-01 2026-07
Bought Sold Largest month: $240,028

Who traded, two years

InsiderBoughtSold TradesLast tradeHolds after
Farrell MatthewDirector $240,028 – 3 2025-08-14 250,225
Frisch JohannaVP AND TREASURER $15,708 – 3 2025-03-14 18,092

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

DateInsiderTradeShares PriceValueHolds afterFiling
2025-08-14 Farrell MatthewDirector Buy 48,609 2.43 $118,120 250,225 Form 4
2025-08-13 Farrell MatthewDirector Buy 26,391 2.45 $64,658 201,616 Form 4
2025-08-12 Farrell MatthewDirector Buy 25,000 2.29 $57,250 175,225 Form 4
2025-03-14 Frisch JohannaVP AND TREASURER Buy 1,500 4.10 $6,150 18,092 Form 4
2025-03-13 Frisch JohannaVP AND TREASURER Buy 1,100 4.02 $4,422 16,592 Form 4
2025-03-12 Frisch JohannaVP AND TREASURER Buy 1,200 4.28 $5,136 15,492 Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

62 × shares withheld for tax18 × grant or award8 × other
Show them
DateInsiderWhatShares PriceHolds afterFiling
2026-05-12 Alvarado JosephDirector Other J −42,484 – 52,187 Form 4
2026-05-12 Farrell MatthewDirector Other J −42,484 – 207,741 Form 4
2026-05-12 Cote Jeffrey JDirector Other J −42,484 – 45,699 Form 4
2026-05-12 Steinmetz HenriDirector Other J −42,484 – 53,453 Form 4
2026-05-12 Lin Sandra BeachDirector Other J −42,484 – 44,776 Form 4
2026-05-12 Johnson KLynneDirector Other J −42,484 – 48,429 Form 4
2026-05-12 Desmond Jeanmarie F.Director Other J −42,484 – 46,552 Form 4
2026-05-12 Brifo VictoriaDirector Other J −42,484 – 40,741 Form 4
2026-02-27 Stasse David PhillipEVP AND CFO Shares withheld for tax F −10,366 0.23 254,788 Form 4
2026-02-27 Chaclas Angelo N.SVP, CLO, CCO & CORP. SEC. Shares withheld for tax F −7,607 0.23 274,798 Form 4
2026-02-27 Bozich Frank ADirector, CEO AND PRESIDENT Shares withheld for tax F −23,680 0.23 664,689 Form 4
2026-02-27 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Shares withheld for tax F −4,028 0.23 103,415 Form 4
2026-02-27 Cooney Paula M.SVP, CHRO Shares withheld for tax F −7,670 0.23 118,318 Form 4
2026-02-27 Reverberi FrancescaSVP, EM and Polymer Solutions Shares withheld for tax F −1,385 0.23 161,250 Form 4
2026-02-27 Hendriks HanSVP, CHIEF TECHNOLOGY OFFICER Shares withheld for tax F −7,707 0.23 73,362 Form 4
2026-02-27 van Kessel BregjeSVP, Corporate Finance & IR Shares withheld for tax F −6,064 0.23 98,296 Form 4
2026-02-27 Greene RogerVP, GLOBAL CONTROLLER & PAO Shares withheld for tax F −2,517 0.23 45,101 Form 4
2026-02-27 Yang Arthas BingSVP, Latex Binders Shares withheld for tax F −2,548 0.23 49,457 Form 4
2026-02-22 Stasse David PhillipEVP AND CFO Shares withheld for tax F −9,671 0.33 265,154 Form 4
2026-02-22 Chaclas Angelo N.SVP, CLO, CCO & CORP. SEC. Shares withheld for tax F −7,098 0.33 282,405 Form 4
2026-02-22 Bozich Frank ADirector, CEO AND PRESIDENT Shares withheld for tax F −32,602 0.33 688,369 Form 4
2026-02-22 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Shares withheld for tax F −1,206 0.33 107,443 Form 4
2026-02-22 Cooney Paula M.SVP, CHRO Shares withheld for tax F −2,684 0.33 125,988 Form 4
2026-02-22 Reverberi FrancescaSVP, EM and Polymer Solutions Shares withheld for tax F −333 0.33 162,635 Form 4
2026-02-22 Hendriks HanSVP, CHIEF TECHNOLOGY OFFICER Shares withheld for tax F −2,291 0.33 81,069 Form 4
2026-02-22 van Kessel BregjeSVP, Corporate Finance & IR Shares withheld for tax F −1,335 0.33 104,360 Form 4
2026-02-22 Yang Arthas BingSVP, Latex Binders Shares withheld for tax F −547 0.33 52,005 Form 4
2026-02-21 Stasse David PhillipEVP AND CFO Shares withheld for tax F −5,028 0.33 274,825 Form 4
2026-02-21 Chaclas Angelo N.SVP, CLO, CCO & CORP. SEC. Shares withheld for tax F −3,690 0.33 289,503 Form 4
2026-02-21 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Shares withheld for tax F −3,907 0.33 108,649 Form 4
2026-02-21 Cooney Paula M.SVP, CHRO Shares withheld for tax F −7,440 0.33 128,672 Form 4
2026-02-21 Reverberi FrancescaSVP, EM and Polymer Solutions Shares withheld for tax F −1,163 0.33 162,968 Form 4
2026-02-21 Hendriks HanSVP, CHIEF TECHNOLOGY OFFICER Shares withheld for tax F −6,331 0.33 83,360 Form 4
2026-02-21 van Kessel BregjeSVP, Corporate Finance & IR Shares withheld for tax F −5,963 0.33 105,695 Form 4
2026-02-21 Greene RogerVP, GLOBAL CONTROLLER & PAO Shares withheld for tax F −2,238 0.33 47,618 Form 4
2026-02-21 Yang Arthas BingSVP, Latex Binders Shares withheld for tax F −1,898 0.33 52,552 Form 4
2025-10-03 Hendriks HanSVP, CHIEF TECHNOLOGY OFFICER Shares withheld for tax F −2,067 2.33 89,691 Form 4
2025-09-30 Frisch JohannaVP AND TREASURER Shares withheld for tax F −2,194 2.35 15,898 Form 4
2025-09-25 Greene RogerVP, GLOBAL CONTROLLER & PAO Shares withheld for tax F −1,617 2.57 49,856 Form 4
2025-06-25 Steinmetz HenriDirector Grant or award A +42,484 – 95,937 Form 4
2025-06-25 Johnson KLynneDirector Grant or award A +42,484 – 90,913 Form 4
2025-06-25 Farrell MatthewDirector Grant or award A +42,484 – 150,225 Form 4
2025-06-25 Desmond Jeanmarie F.Director Grant or award A +42,484 – 89,036 Form 4
2025-06-25 Cote Jeffrey JDirector Grant or award A +42,484 – 88,183 Form 4
2025-06-25 Brifo VictoriaDirector Grant or award A +42,484 – 83,225 Form 4
2025-06-25 Lin Sandra BeachDirector Grant or award A +42,484 – 87,260 Form 4
2025-06-25 Alvarado JosephDirector Grant or award A +42,484 – 94,671 Form 4
2025-06-21 Cote Jeffrey JDirector Shares withheld for tax F −10,310 3.73 45,699 Form 4/A
2025-06-21 Alvarado JosephDirector Shares withheld for tax F −10,327 3.73 52,187 Form 4
2025-06-21 Desmond Jeanmarie F.Director Shares withheld for tax F −10,343 3.73 46,552 Form 4
2025-06-21 Johnson KLynneDirector Shares withheld for tax F −10,474 3.73 48,429 Form 4
2025-06-21 Brifo VictoriaDirector Shares withheld for tax F −9,576 3.73 40,741 Form 4
2025-06-21 De Leener Pierre-MarieDirector Shares withheld for tax F −20,001 3.73 36,174 Form 4
2025-06-21 Farrell MatthewDirector Shares withheld for tax F −9,576 3.73 107,741 Form 4
2025-06-21 Lin Sandra BeachDirector Shares withheld for tax F −10,310 3.73 44,776 Form 4
2025-06-21 Steinmetz HenriDirector Shares withheld for tax F −20,001 3.73 53,453 Form 4
2025-06-21 Tomkins Mark eDirector Shares withheld for tax F −10,105 3.73 36,619 Form 4
2025-02-27 Yang Arthas BingSVP, Latex Binders Grant or award A +31,542 – 54,450 Form 4
2025-02-27 van Kessel BregjeSVP, Corporate Finance & IR Grant or award A +51,973 – 111,658 Form 4
2025-02-27 Stasse David PhillipEVP AND CFO Grant or award A +123,745 – 279,853 Form 4
2025-02-27 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Grant or award A +48,077 – 112,556 Form 4
2025-02-27 Reverberi FrancescaSVP, EM and Polymer Solutions Grant or award A +78,389 – 164,131 Form 4
2025-02-27 Hendriks HanSVP, CHIEF TECHNOLOGY OFFICER Grant or award A +46,707 – 91,758 Form 4
2025-02-27 Greene RogerVP, GLOBAL CONTROLLER & PAO Grant or award A +23,077 – 51,473 Form 4
2025-02-27 Cooney Paula M.SVP, CHRO Grant or award A +65,833 – 136,112 Form 4
2025-02-27 Chaclas Angelo N.SVP, CLO, CCO & CORP. SEC. Grant or award A +90,812 – 293,193 Form 4
2025-02-27 Bozich Frank ADirector, CEO AND PRESIDENT Grant or award A +282,692 – 720,971 Form 4
2025-02-22 Bozich Frank ADirector, CEO AND PRESIDENT Shares withheld for tax F −18,795 5.52 438,279 Form 4
2025-02-22 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Shares withheld for tax F −1,566 5.52 64,479 Form 4
2025-02-21 Chaclas Angelo N.SVP, CLO, CCO & CORP. SEC. Shares withheld for tax F −3,690 5.52 202,381 Form 4
2025-02-21 Cooney Paula M.SVP, CHRO Shares withheld for tax F −7,440 5.52 70,279 Form 4
2025-02-21 Frisch JohannaVP AND TREASURER Shares withheld for tax F −767 5.52 14,292 Form 4
2025-02-21 Greene RogerVP, GLOBAL CONTROLLER & PAO Shares withheld for tax F −2,238 5.52 28,396 Form 4
2025-02-21 Hendriks HanSVP, CHIEF TECHNOLOGY OFFICER Shares withheld for tax F −6,331 5.52 45,051 Form 4
2025-02-21 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Shares withheld for tax F −5,096 5.52 66,045 Form 4
2025-02-21 Stasse David PhillipEVP AND CFO Shares withheld for tax F −6,558 5.52 156,108 Form 4
2025-02-21 Reverberi FrancescaSVP, EM and Polymer Solutions Shares withheld for tax F −1,163 5.52 85,742 Form 4
2025-02-21 van Kessel BregjeSVP, Corporate Finance & IR Shares withheld for tax F −903 5.52 59,685 Form 4
2025-02-21 Yang Arthas BingSVP, Latex Binders Shares withheld for tax F −2,844 5.52 22,908 Form 4
2025-02-16 Bozich Frank ADirector, CEO AND PRESIDENT Shares withheld for tax F −5,130 5.14 457,074 Form 4
2025-02-16 Chaclas Angelo N.SVP, CLO, CCO & CORP. SEC. Shares withheld for tax F −936 5.14 206,071 Form 4
2025-02-16 Cooney Paula M.SVP, CHRO Shares withheld for tax F −1,073 5.14 77,719 Form 4
2025-02-16 Frisch JohannaVP AND TREASURER Shares withheld for tax F −197 5.14 15,059 Form 4
2025-02-16 Reverberi FrancescaSVP, EM and Polymer Solutions Shares withheld for tax F −134 5.14 86,905 Form 4
2025-02-16 Schewe RainerSVP, SUPPLY CHAIN & MFG SVCS Shares withheld for tax F −613 5.14 71,141 Form 4
2025-02-16 Stasse David PhillipEVP AND CFO Shares withheld for tax F −1,845 5.14 162,666 Form 4
2025-02-16 van Kessel BregjeSVP, Corporate Finance & IR Shares withheld for tax F −70 5.14 60,588 Form 4
2024-11-29 Cooney Paula M.SVP, CHRO Shares withheld for tax F −599 4.33 78,792 Form 4

How to read it

Buy, sale
Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan
A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after
The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value
Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

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