$纳斯达克OMX交易所(NDAQ)$ 8-K - Current report Filed: 2013-04-03 AccNo: 0001193125-13-140391 Size: 56 KBItem 1.01: Entry into a Material Definitive AgreementItem 8.01: Other EventsItem 9.01: Financial Statements and Exhibits 网页链接