** Shares of nuclear technology firm Oklo OKLO.N down 1.1% at $21.29 premarket
** Co late on Tuesday said OpenAI CEO Sam Altman will step down as Oklo's chairman
** Oklo CEO & co-founder Jacob DeWitte to take over role of chairman
** OKLO, which went public in 2024 through a merger with Altman's blank-check firm AltC Acquisition Corp, aims to develop its first small modular nuclear reactor by 2027
** 5 brokerages rate stock "buy" or higher, 3 "hold"; their median PT is $45.89 - LSEG
** As of last close, stock gained 1.4% YTD
(Reporting by Mrinalika Roy)
((mrinalika.roy@thomsonreuters.com))