Deep Fission Inc. (FISN:NASDAQ) closed at $2.63 on October 21, 2026, down 6.41% on the day. The stock trades 86.2% below its 52-week high of $19.00 and 1.9% above its 52-week low of $2.58. Over the past year, it lost 81.9%. Deep Fission Inc. is part of the Technology sector.
In 86 trading sessions since June 22, 2026, FISN closed higher on 34 days (40%). Its best day was September 17, 2026 (+14.37%) and its worst was October 20, 2026 (-23.22%). The stock moved 10% or more in a single session 11 times. It opened at least 5% above the previous day's high 1 time.
Deep Fission is revolutionizing the energy landscape with innovative technology that places a small modular pressurized water reactor in a borehole approximately one mile underground. The company's Gravity Nuclear Reactor¿ approach combines established pressurized water reactor technology with a novel underground deployment model designed to simplify construction, enhance safety, and support rapid, scalable commercial deployment. Founded and led by a team of experienced scientists, engineers, and entrepreneurs, Deep Fission is focused on delivering reliable, low-carbon baseload power to meet growing electricity demand from utilities, industrial customers, and data centers. The company is currently advancing the development of its first reactor project in Parsons, Kansas and was selected for the Department of Energy's Reactor Pilot Program.
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Based on end-of-day data. For information only, not investment advice.