twitter inc said friday the window has closed for federal antitrust regulators to block elon musks proposed 44 billion acquisition of the social media company the company said the 30day waiting period established under the hartscottrodino antitrust improvements act of 1976 which gives the federal trade commission and justice department time to review a transaction for potential antitrust violations expired for the deal thursday night musks proposed 5420 a share acquisition is still far from final after the tesla inc ceo said the deal was on hold last month until he could get a handle on the number of fake accounts operating on the platform he added later that he remained committed to the acquisition though analysts believe he may be looking to renegotiate or scrap the deal in light of recent turbulence in teslas stock price and a broader selloff of tech stocks