---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-100533"
form_type: "8-K"
ticker: "AVA"
cik: "0000104918"
company_name: "AVISTA CORP"
filed_at: "2024-08-26T23:59:59+00:00"
generated_at: "2026-05-31T07:34:01.498623+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Avista CEO Dennis Vermillion to retire Dec 31, 2024; Heather Rosentrater named CEO effective Jan 1, 2025

## Summary
- Dennis Vermillion steps down as CEO and board member Dec 31, 2024; will stay as EVP and advisor until Q1 2025.
- Heather Rosentrater, current President and COO, named CEO and board member effective Jan 1, 2025; first female CEO.
- Rosentrater joined Avista in 1996; held roles in transmission, distribution, gas supply; became COO in 2022.
- Vermillion directed Avista through pandemic, supply chain issues, regulatory changes, grid modernization, wildfire risk.
- Rosentrater's CEO compensation package to be determined later by board.

## SEC filing metadata
- accession: 0000950170-24-100533
- form_type: 8-K
- ticker: AVA
- cik: 0000104918
- company_name: AVISTA CORP
- filed_at: 2024-08-26T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/104918/000095017024100533/0000950170-24-100533-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/104918/000095017024100533/ava-20240822.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-100533
- JSON: https://secwatch.observer/filing/0000950170-24-100533.json
- Plain text: https://secwatch.observer/filing/0000950170-24-100533.txt

## Key facts
- Executive change
  Heather L. Rosentrater was appointed as President and Chief Executive Officer at AVISTA CORP.
  - Action: appointed
  - Role: President and Chief Executive Officer
  source text: the Company’s board of directors appointed Heather L. Rosentrater President and Chief Executive Officer and an Avista Corp. board member, effective January 1, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/104918/000095017024100533/0000950170-24-100533-index.htm
- Executive change
  Dennis P. Vermillion changed role as Executive Vice President and strategic advisor at AVISTA CORP.
  - Action: announced
  - Role: Executive Vice President and strategic advisor
  source text: On August 22, 2024, Dennis P. Vermillion, Chief Executive Officer of Avista Corporation (Avista Corp. or the Company), announced to the Company’s board of directors that he will step down as Chief Executive Officer and as an Avista Corp. board member, effective December 31, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/104918/000095017024100533/0000950170-24-100533-index.htm

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