Shares of Sam Altman-backed nuclear technology firm Oklo OKLO.N fall 7% to $103.55 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.