SHPH SHUTTLE PHARMACEUTICALS HOLDINGS INC Investments/Divestments 8-K Filing 2023 - Amendment Agreement with Alto Opportunity Master Fund Shuttle Pharmaceuticals Holdings, Inc. entered into an amendment agreement with Alto Opportunity Master Fund, amending the Transaction Documents and obtaining majority shareholder approval for potential issuance of additional convertible notes and warrants.Get access to all SEC 8-K filings of the SHUTTLE PHARMACEUTICALS HOLDINGS INC