---
schema_version: "secwatch.filing_event.v1"
accession: "0001140361-26-036349"
form_type: "8-K"
ticker: "AMRZ"
cik: "0002035989"
company_name: "Amrize Ltd"
filed_at: "2026-09-11T20:15:50+00:00"
generated_at: "2026-09-11T20:17:04.213977+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Amrize names Mario Gross President of Building Envelope; Gosa resigns

## Summary
- Jake Gosa resigns as President, Building Envelope; 12-month notice period runs to Sept 6, 2027.
- Mario Gross appointed President, Building Envelope effective Sept 11, 2026, succeeding Gosa.
- Gross had been Chief Supply Chain Officer since NYSE listing in June 2025; earlier COO of Building Envelope 2024–2025.
- Gosa remains employed during transition; company cites smooth handover and thanks his contributions.

## SEC filing metadata
- accession: 0001140361-26-036349
- form_type: 8-K
- ticker: AMRZ
- cik: 0002035989
- company_name: Amrize Ltd
- filed_at: 2026-09-11T20:15:50+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2035989/000114036126036349/0001140361-26-036349-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2035989/000114036126036349/ef20081881_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001140361-26-036349
- JSON: https://secwatch.observer/filing/0001140361-26-036349.json
- Plain text: https://secwatch.observer/filing/0001140361-26-036349.txt

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