CANADA - 2025/05/13: In this photo illustration, the Oklo logo is seen displayed on a smartphone ... More screen. (Photo Illustration by Thomas Fuller/SOPA Images/LightRocket via Getty Images)SOPA Images/LightRocket via Getty Images Oklo stock (NYSE:OKLO), the nuclear energy startup supported by OpenAI’s Sam Altman, has performed remarkably well, rising over 140% year-to-date in 2025. There is ample justification for the enthusiasm. Oklo is constructing compact, fast-spectrum microreactors that strive to pr ...