---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-001352"
form_type: "8-K"
ticker: "TTEK"
cik: "0000831641"
company_name: "TETRA TECH INC"
filed_at: "2026-01-06T23:59:59+00:00"
generated_at: "2026-05-16T11:36:12.091959+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Tetra Tech appoints Roger Argus CEO, Dan Batrack becomes Executive Chairman effective Feb 19, 2026

## Summary
- Roger Argus, currently President, will succeed Dan Batrack as CEO and join the Board on Feb 19, 2026.
- Dan Batrack transitions to Executive Chairman for a minimum of two years, ensuring strategic continuity.
- Argus has over 30 years at Tetra Tech, most recently as President and previously leading major divisions.
- Batrack served as CEO for 20+ years, growing Tetra Tech to ~$5B revenue and 25,000 employees globally.

## SEC filing metadata
- accession: 0001104659-26-001352
- form_type: 8-K
- ticker: TTEK
- cik: 0000831641
- company_name: TETRA TECH INC
- filed_at: 2026-01-06T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/831641/000110465926001352/0001104659-26-001352-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/831641/000110465926001352/tm262000d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-001352
- JSON: https://secwatch.observer/filing/0001104659-26-001352.json
- Plain text: https://secwatch.observer/filing/0001104659-26-001352.txt

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