Deep Fission, a nuclear startup based in Berkeley, has filed for a Nasdaq IPO aiming to raise up to $156 million. The company plans to offer 6 million shares priced between $24 and $26, valuing it at approximately $1.66 billion. This move comes less than a year after Deep Fission went public via a SPAC merger, which raised $30 million at $3 per share. The company, known for its Gravity Nuclear Reactor technology, seeks to transition from the OTCQB marketplace to Nasdaq, enhancing its appeal to institutional investors. Founded in 2023 by Richard A. Muller and Elizabeth Muller, Deep Fission focuses on underground nuclear reactors designed to power AI data centers. The company recently secured $80 million in financing and aims for pilot criticality by mid-2026 under a U.S. Department of Energy initiative.