UBS will cover Oklo stock -- but it wouldn't buy Oklo stock.Shares of Oklo (OKLO -1.05%), the nuclear start-up that wants to make small nuclear reactors a "thing," fell nearly 7% in morning trading Wednesday before clawing back some of its losses in the afternoon.As of 12:55 p.m. ET, Oklo stock remains down -- but only 1.4%. What spooked Oklo investors today?Blame UBS for the early sell-off.In a note on TheFly.com this morning, the Swiss megabanker initiated coverage of Oklo stock, but only with a neutral ( ...