---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-034691"
form_type: "8-K"
ticker: "DINO"
cik: "0001915657"
company_name: "HF Sinclair Corp"
filed_at: "2026-05-13T21:18:13+00:00"
generated_at: "2026-05-13T21:20:27.755311+00:00"
event_type: "leadership"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# HF Sinclair terminates CFO Atanas Atanasov effective May 13, 2026

## Summary
- Atanas Atanasov's employment as EVP and CFO terminated immediately; he had been on leave since Feb 24, 2026.
- Vivek Garg, VP and CAO, continues as acting CFO, a role he assumed on Feb 24, 2026.
- If conditions of the Severance Pay Plan are met, Atanasov will receive severance benefits.
- No successor CFO has been announced; further leadership changes may follow.

## SEC filing metadata
- accession: 0001628280-26-034691
- form_type: 8-K
- ticker: DINO
- cik: 0001915657
- company_name: HF Sinclair Corp
- filed_at: 2026-05-13T21:18:13+00:00
- event_type: leadership
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1915657/000162828026034691/0001628280-26-034691-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1915657/000162828026034691/dino-20260513.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-034691
- JSON: https://secwatch.observer/filing/0001628280-26-034691.json
- Plain text: https://secwatch.observer/filing/0001628280-26-034691.txt

## Key facts
- Executive change
  Vivek Garg changed role as acting Chief Financial Officer at HF Sinclair Corp.
  - Action: continues as acting CFO
  - Role: acting Chief Financial Officer
  source text: As previously reported, effective February 24, 2026, the Board of Directors of the Company appointed Mr. Vivek Garg, the Company’s Vice President, Chief Accounting Officer and Controller, to serve as the Company’s acting Chief Financial Officer.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1915657/000162828026034691/0001628280-26-034691-index.htm
- Executive change
  Atanas Atanasov was terminated as Executive Vice President and Chief Financial Officer at HF Sinclair Corp.
  - Action: terminated
  - Role: Executive Vice President and Chief Financial Officer
  source text: On May 13, 2026, HF Sinclair Corporation (the “ Company ”) terminated the employment of Mr. Atanas Atanasov as Executive Vice President and Chief Financial Officer of the Company, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1915657/000162828026034691/0001628280-26-034691-index.htm

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