Comparable stake leader
Nut Tree Capital Management, LP
SEC ownership of Trinseo PLC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001519061.
Disclosed value leader
M&G INVESTMENT MANAGEMENT LTD
Comparable rows
39/49
Latest evidence
12 May 2026
- Public ticker
- TSEOQ on OTC
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Nut Tree Capital Management, LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
39 of 49
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Nut Tree Capital Management, LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
12 May 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001519061
- Issuer location
- Wayne, PA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Trinseo PLC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Nut Tree Capital Manageme...
Disclosed value leader
M&G INVESTMENT MANAGEMENT...
Comparable rows
39/49
Latest evidence
12 May 2026
13D/G
3/4/5
13F
Lead comparable stake: 8.3%
10 rows are not safely comparable across share classes.
13D/G row: Nut Tree Capital Management, LP
Showing 1-8 of 49 holder rows.
Quick read
Nut Tree Capital Management, LP leads the comparable SEC ownership view at 8.3%.
39 of 49 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Nut Tree Capital Management, LP's linked filing trail.
Comparable ownership
Top 5
Nut Tree Capital Management, LP
8.3%
BlackRock, Inc.
6.3%
CHARLES SCHWAB INVESTMENT MANAGEM...
5.8%
CastleKnight Master Fund LP
1.4%
Frank A. Bozich
1.8%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 49 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Nut Tree Capital Management, LP |
13D/G
|
8.3%
|
—
3,027,280 shares
|
$0 | 31 Mar 2026 |
| BlackRock, Inc. |
13D/G
|
6.3%
|
$8,456,719
2,255,125 shares
|
$0 | 30 Jun 2025 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13D/G
|
5.8%
|
$1,693,811
2,091,125 shares
|
$0 | 31 Dec 2025 |
| CastleKnight Master Fund LP |
13D/G
|
1.4%
|
$418,629
516,826 shares
|
-$1,822,014 | 31 Dec 2025 |
| Frank A. Bozich |
3/4/5
CEO AND PRESIDENT, Director
|
1.8%
|
$152,878
664,689 shares
|
— | 27 Feb 2026 |
| Angelo N. Chaclas |
3/4/5
SVP, CLO, CCO & CORP. SEC.
|
0.74%
|
$63,203
274,798 shares
|
— | 27 Feb 2026 |
| David Phillip Stasse |
3/4/5
EVP AND CFO
|
0.69%
|
$58,601
254,788 shares
|
— | 27 Feb 2026 |
| Jeffrey J. Cote |
3/4/5
Director
|
0.59%
|
$721,733
216,202 shares
|
— | 12 May 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$240,028.
Buys
$240,028
Insiders: 1
Sells
$0
Insiders: 0
Net
+$240,028
Shares: +100,000
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 100,000
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 100,000 | 0 | $240,028 | $0 | +$240,028 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 33 reporting-owner rows connected to Trinseo PLC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
33
Largest Forms 3/4/5 holder
M&G INVESTMENT MANAGEMENT LTD
Net 12M change
+$240,028
Latest report
12 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| M&G INVESTMENT MANAGEMENT LTD | 10%+ Owner | $54,976,567 | Mixed | 19 Jul 2022 | ||
| Jeffrey J. Cote | Director | $721,733 | Mixed | 12 May 2026 | ||
| Matthew Farrell | Director | $608,046 | +$240,028 | +65% | Mixed | 12 May 2026 |
| Henri Steinmetz | Director | $267,664 | Mixed | 12 May 2026 | ||
| Joseph Alvarado | Director | $264,132 | Mixed | 12 May 2026 | ||
| Klynne Johnson | Director | $253,647 | Mixed | 12 May 2026 | ||
| Jeanmarie F. Desmond | Director | $248,410 | Mixed | 12 May 2026 | ||
| Sandra Beach Lin | Director | $243,455 | Mixed | 12 May 2026 | ||
| Victoria Brifo | Director | $232,197 | Mixed | 12 May 2026 | ||
| Frank A. Bozich | CEO AND PRESIDENT, Director | $152,878 | Mixed | 27 Feb 2026 | ||
| Misheff Donald T. | Director | $141,705 | Mixed | 14 Jun 2023 | ||
| Mark E. Tomkins | Director | $136,588 | Mixed | 21 Jun 2025 | ||
| Pierre-Marie de Leener | Director | $134,929 | Mixed | 21 Jun 2025 | ||
| Andre Lanning | Svp & Cco | $130,825 | Mixed | 25 Feb 2023 | ||
| Nicolas Joly | SVP, Styrenics | $107,631 | Mixed | 25 Feb 2023 | ||
| Bernard M. Skeete | VP, CAO & Global Controller | $92,447 | Mixed | 25 Feb 2023 | ||
| Timothy J. Thomas | Svp, Mfctg & Oper Excellence | $84,783 | Mixed | 17 Feb 2024 | ||
| Alice Heezen | SVP - Human Resources | $72,684 | Mixed | 12 Nov 2021 | ||
| Philip R. Martens | Director | $67,875 | Mixed | 14 Jun 2023 | ||
| Jean-Luc Beal | SVP, Engineered Materials | $66,721 | Mixed | 22 Feb 2023 |
Recent insider transactions for Trinseo PLC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Sandra Beach Lin | TSEOF | Ordinary Shares | Other | -48.7% | -42,484 | 44,776 | 12 May 2026 | Direct | ||
| Jeanmarie F. Desmond | TSEOF | Ordinary Shares | Other | -47.7% | -42,484 | 46,552 | 12 May 2026 | Direct | ||
| Jeffrey J. Cote | TSEOF | Ordinary Shares | Other | -48.2% | -42,484 | 45,699 | 12 May 2026 | Direct | ||
| Joseph Alvarado | TSEOF | Ordinary Shares | Other | -44.9% | -42,484 | 52,187 | 12 May 2026 | Direct | ||
| Klynne Johnson | TSEOF | Ordinary Shares | Other | -46.7% | -42,484 | 48,429 | 12 May 2026 | Direct | ||
| Victoria Brifo | TSEOF | Ordinary Shares | Other | -51% | -42,484 | 40,741 | 12 May 2026 | Direct | ||
| Matthew Farrell | TSEOF | Ordinary Shares | Other | -17% | -42,484 | 207,741 | 12 May 2026 | Direct | ||
| Henri Steinmetz | TSEOF | Ordinary Shares | Other | -44.3% | -42,484 | 53,453 | 12 May 2026 | Direct | ||
| Arthas Bing Yang | TSE | Ordinary Shares | Tax liability | -4.9% | -2,548 | 49,457 | 27 Feb 2026 | Direct | ||
| Bregje van Kessel | TSE | Ordinary Shares | Tax liability | -5.81% | -6,064 | 98,296 | 27 Feb 2026 | Direct | ||
| Rainer Schewe | TSE | Ordinary Shares | Tax liability | -3.75% | -4,028 | 103,415 | 27 Feb 2026 | Direct | ||
| Francesca Reverberi | TSE | Ordinary Shares | Tax liability | -0.85% | -1,385 | 161,250 | 27 Feb 2026 | Direct | ||
| Han Hendriks | TSE | Ordinary Shares | Tax liability | -9.51% | -7,707 | 73,362 | 27 Feb 2026 | Direct | ||
| Roger Greene | TSE | Ordinary Shares | Tax liability | -5.29% | -2,517 | 45,101 | 27 Feb 2026 | Direct | ||
| Paula M. Cooney | TSE | Ordinary Shares | Tax liability | -6.09% | -7,670 | 118,318 | 27 Feb 2026 | Direct | ||
| Angelo N. Chaclas | TSE | Ordinary Shares | Tax liability | -2.69% | -7,607 | 274,798 | 27 Feb 2026 | Direct | ||
| David Phillip Stasse | TSE | Ordinary Shares | Tax liability | -3.91% | -10,366 | 254,788 | 27 Feb 2026 | Direct | ||
| Frank A. Bozich | TSE | Ordinary Shares | Tax liability | -3.44% | -23,680 | 664,689 | 27 Feb 2026 | Direct | ||
| Francesca Reverberi | TSE | Ordinary Shares | Tax liability | -0.2% | -333 | 162,635 | 22 Feb 2026 | Direct | ||
| Han Hendriks | TSE | Ordinary Shares | Tax liability | -2.75% | -2,291 | 81,069 | 22 Feb 2026 | Direct | ||
| Arthas Bing Yang | TSE | Ordinary Shares | Tax liability | -1.04% | -547 | 52,005 | 22 Feb 2026 | Direct | ||
| Bregje van Kessel | TSE | Ordinary Shares | Tax liability | -1.26% | -1,335 | 104,360 | 22 Feb 2026 | Direct | ||
| Rainer Schewe | TSE | Ordinary Shares | Tax liability | -1.11% | -1,206 | 107,443 | 22 Feb 2026 | Direct | ||
| Paula M. Cooney | TSE | Ordinary Shares | Tax liability | -2.09% | -2,684 | 125,988 | 22 Feb 2026 | Direct | ||
| David Phillip Stasse | TSE | Ordinary Shares | Tax liability | -3.52% | -9,671 | 265,154 | 22 Feb 2026 | Direct | ||
| Frank A. Bozich | TSE | Ordinary Shares | Tax liability | -4.52% | -32,602 | 688,369 | 22 Feb 2026 | Direct | ||
| Angelo N. Chaclas | TSE | Ordinary Shares | Tax liability | -2.45% | -7,098 | 282,405 | 22 Feb 2026 | Direct | ||
| Francesca Reverberi | TSE | Ordinary Shares | Tax liability | -0.71% | -1,163 | 162,968 | 21 Feb 2026 | Direct | ||
| Han Hendriks | TSE | Ordinary Shares | Tax liability | -7.06% | -6,331 | 83,360 | 21 Feb 2026 | Direct | ||
| Arthas Bing Yang | TSE | Ordinary Shares | Tax liability | -3.49% | -1,898 | 52,552 | 21 Feb 2026 | Direct | ||
| Bregje van Kessel | TSE | Ordinary Shares | Tax liability | -5.34% | -5,963 | 105,695 | 21 Feb 2026 | Direct | ||
| Rainer Schewe | TSE | Ordinary Shares | Tax liability | -3.47% | -3,907 | 108,649 | 21 Feb 2026 | Direct | ||
| Paula M. Cooney | TSE | Ordinary Shares | Tax liability | -5.47% | -7,440 | 128,672 | 21 Feb 2026 | Direct | ||
| Roger Greene | TSE | Ordinary Shares | Tax liability | -4.49% | -2,238 | 47,618 | 21 Feb 2026 | Direct | ||
| David Phillip Stasse | TSE | Ordinary Shares | Tax liability | -1.8% | -5,028 | 274,825 | 21 Feb 2026 | Direct | ||
| Angelo N. Chaclas | TSE | Ordinary Shares | Tax liability | -1.26% | -3,690 | 289,503 | 21 Feb 2026 | Direct | ||
| Han Hendriks | TSE | Ordinary Shares | Tax liability | -2.25% | -2,067 | 89,691 | 03 Oct 2025 | Direct | ||
| Johanna Frisch | TSE | Ordinary Shares | Tax liability | -12.1% | -2,194 | 15,898 | 30 Sep 2025 | Direct | ||
| Roger Greene | TSE | Ordinary Shares | Tax liability | -3.14% | -1,617 | 49,856 | 25 Sep 2025 | Direct | ||
| Matthew Farrell | TSE | Ordinary Shares | Purchase | 24.1% | $118,120 | $2.43 | 48,609 | 250,225 | 14 Aug 2025 | Direct |
| Matthew Farrell | TSE | Ordinary Shares | Purchase | 15.1% | $64,658 | $2.45 | 26,391 | 201,616 | 13 Aug 2025 | Direct |
| Matthew Farrell | TSE | Ordinary Shares | Purchase | 16.6% | $57,250 | $2.29 | 25,000 | 175,225 | 12 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.