---
schema_version: "secwatch.filing_event.v1"
accession: "0001289308-25-000008"
form_type: "8-K"
ticker: "ENS"
cik: "0001289308"
company_name: "EnerSys"
filed_at: "2025-03-28T23:59:59+00:00"
generated_at: "2026-05-24T02:55:47.342109+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# EnerSys separates with CTO Joern Tinnemeyer; appoints Mark Matthews as Acting CTO

## Summary
- March 26, 2025: EnerSys separated employment with Joern Tinnemeyer, SVP and Chief Technology Officer.
- Mark Matthews, President Specialty Global, appointed Acting Chief Technology Officer effective March 26, 2025.
- Matthews will retain his President, Specialty Global role while serving as Acting CTO.

## SEC filing metadata
- accession: 0001289308-25-000008
- form_type: 8-K
- ticker: ENS
- cik: 0001289308
- company_name: EnerSys
- filed_at: 2025-03-28T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 7.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1289308/000128930825000008/0001289308-25-000008-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1289308/000128930825000008/ens-20250326.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001289308-25-000008
- JSON: https://secwatch.observer/filing/0001289308-25-000008.json
- Plain text: https://secwatch.observer/filing/0001289308-25-000008.txt

## Key facts
- Executive change
  Joern Tinnemeyer departed as Senior Vice President and Chief Technology Officer at EnerSys.
  - Action: separated employment
  - Role: Senior Vice President and Chief Technology Officer
  source text: On March 26, 2025, EnerSys separated employment with Joern Tinnemeyer, EnerSys’ Senior Vice President and Chief Technology Officer.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1289308/000128930825000008/0001289308-25-000008-index.htm

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