---
schema_version: "secwatch.filing_event.v1"
accession: "0001437749-25-016134"
form_type: "8-K"
ticker: "FTEK"
cik: "0000846913"
company_name: "FUEL TECH, INC."
filed_at: "2025-05-12T23:59:59+00:00"
generated_at: "2026-05-22T01:03:09.926017+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Fuel Tech Q1 revenue rises 29% to $6.4M; backlog up 66%; net loss narrows

## Summary
- Revenue rose 29% to $6.4M; gross margin expanded to 46.4% from 40.9%.
- Net loss $(739K) ($0.02/sh); Q1 2024 had $1.7M one-time ERC credit; ex-ERC pro forma net loss $(1.4M).
- FUEL CHEM revenue up 92% to $5.1M; APC revenue down 44% to $1.3M.
- Backlog rose 66% to $10.3M; cash and investments $31.2M, no long-term debt.

## SEC filing metadata
- accession: 0001437749-25-016134
- form_type: 8-K
- ticker: FTEK
- cik: 0000846913
- company_name: FUEL TECH, INC.
- filed_at: 2025-05-12T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/846913/000143774925016134/0001437749-25-016134-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/846913/000143774925016134/ftek20250429_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001437749-25-016134
- JSON: https://secwatch.observer/filing/0001437749-25-016134.json
- Plain text: https://secwatch.observer/filing/0001437749-25-016134.txt

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