---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-029450"
form_type: "8-K"
ticker: "BCHT"
cik: "0000728385"
company_name: "Birchtech Corp."
filed_at: "2026-03-17T23:59:59+00:00"
generated_at: "2026-05-15T11:12:17.523020+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Birchtech raises additional $1.4M via partial exercise of over-allotment option

## Summary
- On Mar 17, 2026, sold 600,000 shares at $2.40 to Lake Street Capital Markets.
- Total offering now 6.85M shares with gross proceeds of approximately $16.4M.
- Over-allotment option still allows up to 337,500 additional shares unexercised.
- Previously reported February 27, 2026 public offering of 6.25M shares at $2.40.

## SEC filing metadata
- accession: 0001104659-26-029450
- form_type: 8-K
- ticker: BCHT
- cik: 0000728385
- company_name: Birchtech Corp.
- filed_at: 2026-03-17T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/728385/000110465926029450/0001104659-26-029450-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/728385/000110465926029450/tm268923d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-029450
- JSON: https://secwatch.observer/filing/0001104659-26-029450.json
- Plain text: https://secwatch.observer/filing/0001104659-26-029450.txt

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