Shares of Oklo Inc. (OKLO) and X-energy Inc. (XE) edged higher in the premarket session on Tuesday even as Cathie Wood’s ARK Investment Management increased its stake in the nuclear energy companies.

OKLO stock was up more than 1% at the time of writing, while XE stock gained more than 2%.

Wood Dips Back Into Nuclear Plays

The asset management firm’s  bought 100,854 shares of OKLO, valued at about $4.7 million, according to the company’s trade notification and website.

As per TheFly, Truist analyst Christopher Souther initiated coverage of Oklo with a ‘Hold’ rating and a $55 price target, implying an upside of about 20% from its last close.

The firm put ‘Hold’ ratings on Oklo, , and , noting that the companies' "first-of-a-kind projects" are moving toward execution. While customer demand and policy support continue to improve, proof of execution will be the key catalyst for sector leadership, the analyst added.

Meanwhile, ARK Invest also bought about 545,453 shares of XE across its ARK Innovation ETF (ARKK), ARK Space Exploration & Innovation ETF (ARKX) and ARKQ, worth about $8.7 million in total.

Wood’s fund has been rapidly accumulating XE stock since the start of the month, even as the company’s shares have plunged more than 47% below the IPO price.

The buying spree comes amid renewed spotlight on nuclear energy stocks, driven by growing electricity needs from AI infrastructure and policy measures aimed at accelerating reactor development and strengthening U.S. nuclear power production.

OKLO, XE Stocks: How Does Retail Feel?

On Stocktwits, retail sentiment around OKLO stock was ‘neutral,’ while it was ‘bullish’ for XE stock.

Retail chatter around both tickers jumped over 24 hours, with messages soaring more than 179% for OKLO and 500% for XE.

One user said on Oklo, “auntie Cathie woods coming to save us :)”

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Another user noted that XE stock was “getting close to a fifty two week low.”

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OKLO stock has lost about 41% of its value since the start of the year, compared to XE’s 47% decline.