---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-057420"
form_type: "8-K"
ticker: "NEU"
cik: "0001282637"
company_name: "NEWMARKET CORP"
filed_at: "2026-02-18T23:59:59+00:00"
generated_at: "2026-05-16T01:57:57.180054+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# NewMarket appoints Susan M. Ridlehoover as Principal Accounting Officer

## Summary
- Susan M. Ridlehoover, 45, appointed Principal Accounting Officer effective Feb 18, 2026.
- She joined NewMarket as Controller in January 2026 after serving as Senior Director, Corporate Controller at Sonoco.
- Base salary of $235,000; eligible for cash bonuses, restricted stock awards, and company benefit programs.
- Ridlehoover is a licensed CPA in Virginia with over 20 years of accounting and finance experience.

## SEC filing metadata
- accession: 0001193125-26-057420
- form_type: 8-K
- ticker: NEU
- cik: 0001282637
- company_name: NEWMARKET CORP
- filed_at: 2026-02-18T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1282637/000119312526057420/0001193125-26-057420-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1282637/000119312526057420/d22589d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-057420
- JSON: https://secwatch.observer/filing/0001193125-26-057420.json
- Plain text: https://secwatch.observer/filing/0001193125-26-057420.txt

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