UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Title of Each Class Trading Symbol(s) Name of Each Exchange on which Registered Class A Common Stock, 0.0001parvaluepershareACMRNasdaqGlobalMarketLargeacceleratedfiler☐Acceleratedfiler☐Non−acceleratedfiler☐Smallerreportingcompany☑Emerginggrowthcompany☑ClassNumberofSharesOutstandingClassACommonStock,0.0001 par value 14,259,479 shares outstanding as of August 5, 2019 Class B Common Stock, $0.0001 par ...