SHPH SHUTTLE PHARMACEUTICALS HOLDINGS INC Investments/Divestments 8-K Filing 2023 - Entry Into A Material Definitive Agreement Shuttle Pharmaceuticals Holdings, Inc. entered into a securities purchase agreement with Alto Opportunity Master Fund, SPC Segregated Master Portfolio B, selling a $4.3 million convertible note and warrant in exchange for gross proceeds of $4.0 million.Get access to all SEC 8-K filings of the SHUTTLE PHARMACEUTICALS HOLDINGS INC