Shares of Oklo Inc. (OKLO) tumbled 5.09% in after-hours trading on Tuesday, despite the company reporting a narrower-than-expected loss for the first quarter of 2025. The advanced nuclear technology firm, which has been making strides in its efforts to build its first commercial nuclear powerhouse, saw its stock price drop following the release of its quarterly financial results.

Oklo reported a Q1 net loss of $0.07 per diluted share, significantly narrowing from the loss of $0.34 per share in the same period last year. The result also beat analysts' expectations, as a FactSet poll had predicted a loss of $0.11 per share. Despite this improvement, investors seemed to react negatively to the report, possibly due to concerns about the company's ongoing capital expenditures as it works towards commissioning its first nuclear plant.

The after-hours decline comes on the heels of positive developments for Oklo. Earlier in the day, the company announced the completion of site characterization borehole drilling for its first powerhouse, a crucial step in its plans to construct an Aurora facility on the grounds of Idaho National Laboratory. Additionally, Oklo appointed Pat Schweiger as its new Chief Technology Officer, potentially bolstering its technical leadership. However, these positive news items were overshadowed by the market's reaction to the earnings report, highlighting the challenges Oklo faces as it continues to invest heavily in its innovative nuclear technology while working towards profitability.