** Shares of Sam Altman-backed nuclear technology firm Oklo OKLO.N fall 6.3% to $104.40 in extended trading
** OKLO unveils up to $1.5 billion "at-the-market" equity offering program
** Goldman Sachs, BofA Securities, Citigroup, Morgan Stanley, Barclays Capital, TD Securities, Guggenheim Securities, B. Riley Securities, and William Blair will handle the program
** OKLO stock closed up 15.6% at $111.65 on Thursday
** With 156.3 million outstanding shares, OKLO has $17.4 billion market cap, per data compiled by LSEG
** 10 of 18 brokerages rate the stock "buy" or higher, 7 "hold" and 1 "sell"; median PT is $108.50
** As of last close, OKLO up 425.9% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com))