Public offering · Climate tech
Deep Fission closes $40 million public offering
The company sold 2.5 million common shares at $16 each.
Deep Fission closed a $40 million public offering on June 22, 2026, before underwriting costs and other expenses. Its shares began trading on Nasdaq under the ticker FISN on June 18.
The Berkeley company plans to use the proceeds for engineering, research, licensing and construction of its first pilot nuclear reactor. Its design places a small pressurized water reactor approximately one mile underground.
Funding history
Public offering · This round$40M