$Clear Channel Outdoor Holdings, Inc. Clear Channel Outdoor Holdings, Inc. Class A(CCO)$ 8-K - Current report Filed: 2018-04-03 AccNo: 0001193125-18-106362 Size: 26 KBItem 3.01: Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of ListingItem 8.01: Other EventsItem 9.01: Financial Statements and Exhibits 网页链接