---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-23-012026"
form_type: "8-K"
ticker: "TSEOF"
cik: "0001519061"
company_name: "Trinseo PLC"
filed_at: "2023-07-20T23:59:59+00:00"
generated_at: "2026-06-13T05:34:50.656092+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Trinseo restructures ELT; three depart, three assume expanded roles

## Summary
- Three ELT members leaving: Andre Lanning (COO), Nicolas Joly, Jean-Luc Béal; effective Aug 1, 2023.
- ELT reduced from 12 to 9 members; Francesca Reverberi adds Engineered Materials leadership.
- Bregje Roseboom-Van Kessel to lead combined Plastics Solutions & Polystyrene/Feedstocks.
- James Ni assumes ownership of marketing and commercial excellence across Trinseo.
- Lanning's severance: 1.5x (base salary + target bonus) paid over 18 months; continued benefits.

## SEC filing metadata
- accession: 0001558370-23-012026
- form_type: 8-K
- ticker: TSEOF
- cik: 0001519061
- company_name: Trinseo PLC
- filed_at: 2023-07-20T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1519061/000155837023012026/0001558370-23-012026-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1519061/000155837023012026/tse-20230720x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-23-012026
- JSON: https://secwatch.observer/filing/0001558370-23-012026.json
- Plain text: https://secwatch.observer/filing/0001558370-23-012026.txt

## Key facts
- Executive change
  Andre Lanning was terminated as Senior Vice President and Chief Operating Officer at Trinseo PLC.
  - Action: terminated
  - Role: Senior Vice President and Chief Operating Officer
  source text: On July 18, 2023, Trinseo PLC (the “Company”) announced that Andre Lanning, the Company’s Senior Vice President and Chief Operating Officer would be terminated in connection with a reorganization of the Company’s executive leadership team.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1519061/000155837023012026/0001558370-23-012026-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.