Clearsign Technologies Corporation

CLIR·NASDAQ·$4.63Share Price as of 11/2·$25MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/14/26 10-QQ1 ended 03/31/2605/15/26 10-KFY 202503/31/26 10-QQ3 ended 09/30/2511/14/25 10-QQ2 ended 06/30/2508/14/25

Disclosures

8-KCurrent report09/14/26 8-KCurrent report08/20/26 8-KCurrent report08/11/26 8-KCurrent report07/23/26 8-KCurrent report07/06/26

Prospectuses and Registrations

424B5Prospectus supplement07/06/26 S-8Registration of securities for employees07/06/26 424B5Prospectus supplement06/01/26 424B5Prospectus supplement05/28/26 424B4Prospectus08/22/25

Proxies

DEF 14ADefinitive proxy04/28/26 DEFA14AAdditional proxy materials04/28/26 DEF 14ADefinitive proxy02/02/26 PRE 14APreliminary proxy01/23/26 DEFA14AAdditional proxy materials07/11/25

Ownership

Form 4Insider transaction10/02/26 Form 4Insider transaction10/02/26 Form 4Insider transaction10/02/26 Form 4Insider transaction10/02/26 Form 3Initial insider ownership08/11/26

Other

DD07/31/26 ARSAnnual report to shareholders04/28/26 EFFECTRequest for effectiveness08/21/25 CORRESPCorrespondence with the SEC08/20/25 UPLOADLetter from the SEC08/14/25