On June 4, 2025, Clean Energy Technologies, Inc. sold a convertible promissory note worth $335,000 and 50,000 shares for $301,500 to Mast Hill Fund, receiving net funding of $296,500 for business development. The transaction includes a shareholder meeting requirement if stock falls below $0.50 and caps share issuance to Mast Hill at 12.37 million until approval.