---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-018205"
form_type: "8-K"
ticker: "TTEK"
cik: "0000831641"
company_name: "TETRA TECH INC"
filed_at: "2026-02-20T23:59:59+00:00"
generated_at: "2026-05-16T01:37:12.730482+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Tetra Tech appoints CEO Roger R. Argus to board; Batrack becomes Executive Chairman

## Summary
- Roger R. Argus appointed to Board of Directors effective Feb 19, 2026, following his promotion to CEO earlier in February.
- Dan L. Batrack signed filing as Executive Chairman, indicating transition from CEO role.
- All six director nominees elected with support from over 88% of votes cast; advisory say-on-pay approved with 92.2% for.
- Amendment to Employee Stock Purchase Plan approved (99.5% for); PricewaterhouseCoopers ratified as auditor for fiscal 2026.
- Board now has seven members; Argus will not serve on any committee.

## SEC filing metadata
- accession: 0001104659-26-018205
- form_type: 8-K
- ticker: TTEK
- cik: 0000831641
- company_name: TETRA TECH INC
- filed_at: 2026-02-20T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 5.07, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/831641/000110465926018205/0001104659-26-018205-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/831641/000110465926018205/tm266903d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-018205
- JSON: https://secwatch.observer/filing/0001104659-26-018205.json
- Plain text: https://secwatch.observer/filing/0001104659-26-018205.txt

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