Birchtech Corporation.

BCHT·AMEX·$1.54Share Price as of 11/2·$41MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/13/26 10-QQ1 ended 03/31/2605/13/26 10-KFY 202503/31/26 10-QQ3 ended 09/30/2511/13/25 10-QQ2 ended 06/30/2508/14/25

Disclosures

8-KCurrent report07/28/26 8-K/ACurrent report (amended)05/12/26 8-KCurrent report05/06/26 8-KCurrent report04/13/26 8-KCurrent report03/17/26

Prospectuses and Registrations

424B4Prospectus02/27/26 S-1/ARegistration statement (amended)02/12/26 S-1/ARegistration statement (amended)02/03/26 S-1Registration statement (IPO)01/13/26 S-1Registration statement (IPO)11/10/21

Proxies

DEF 14ADefinitive proxy06/24/26 PRE 14APreliminary proxy06/08/26 DEF 14ADefinitive proxy11/27/24 PRE 14APreliminary proxy11/13/24 DEF 14ADefinitive proxy11/03/23

Ownership

SC 13GBeneficial ownership10/05/26 Form 3Initial insider ownership05/06/26 Form 4Insider transaction03/02/26 Form 4Insider transaction12/15/25 Form 4Insider transaction12/15/25

Other

ARSAnnual report to shareholders06/24/26 CERTCEO/CFO certification02/25/26 EFFECTRequest for effectiveness02/17/26 CORRESPCorrespondence with the SEC02/12/26 CORRESPCorrespondence with the SEC02/12/26