---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-23-057146"
form_type: "8-K"
ticker: "TTEK"
cik: "0000831641"
company_name: "TETRA TECH INC"
filed_at: "2023-05-08T23:59:59+00:00"
generated_at: "2026-06-15T15:05:23.307544+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Tetra Tech SVP Derek Amidon resigns effective May 12, 2023

## Summary
- Derek Amidon, SVP and President of Commercial/International Services Group and Energy Engineering Division, resigns.
- Resignation effective May 12, 2023; no successor named in the filing.
- No reason for departure disclosed; the filing is a standard 8-K Item 5.02 disclosure.

## SEC filing metadata
- accession: 0001104659-23-057146
- form_type: 8-K
- ticker: TTEK
- cik: 0000831641
- company_name: TETRA TECH INC
- filed_at: 2023-05-08T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/831641/000110465923057146/0001104659-23-057146-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/831641/000110465923057146/tm2314793d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-23-057146
- JSON: https://secwatch.observer/filing/0001104659-23-057146.json
- Plain text: https://secwatch.observer/filing/0001104659-23-057146.txt

## Key facts
- Executive change
  Derek Amidon resigned as Senior Vice President, President, Commercial/International Services Group and President, Energy Engineering Division at TETRA TECH INC.
  - Action: resigned
  - Role: Senior Vice President, President, Commercial/International Services Group and President, Energy Engineering Division
  source text: On May 2, 2023, Derek Amidon, Senior Vice President, President, Commercial/International Services Group and President, Energy Engineering Division, notified Tetra Tech, Inc. of his resignation, effective May 12, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/831641/000110465923057146/0001104659-23-057146-index.htm

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