Former President Donald Trump threatened Nasdaq and the S.E.C. on Friday afternoon as he floated another baseless conspiracy theory that the two were in cahoots in twice halting trading activity for his Trump Media stock. Shares of the stock rocketed up Friday in the minutes after majority owner Trump insisted he has no plans to sell his stake, CNBC reported. Trump Media shares rose as high as 25 percent and ended the day up more than 11 percent. But trading activity for his stock was briefly halted twice due to volatility, a fact that caught Trump’s ire. Want more breaking political news? Cli…