Deep Fission, Inc.

Pre-IPO issuer · FISN

ipo trading filed Nasdaq CONFIDENTIAL-S1

Deep Fission, Inc. IPO research page with SEC filing history, offering status, deal terms, structured filing extracts, company news, and comparable IPO context. Latest filing: CONFIDENTIAL-S1 on 2026-04-22. Current deal snapshot: exchange Nasdaq.

Filing Timeline

Synthetic IPOGrid ID

CONFIDENTIAL-S1 filed

Confidential registration lead

Renaissance Capital reported on May 20, 2026 that Deep Fission publicly filed for a U.S. IPO and had filed confidentially on April 22, 2026. The report said Deep Fission plans to list on Nasdaq as FISN.

public prospectus 2026-05-20

Range $24.00 to $26.00

Exchange Nasdaq · Ticker FISN · Underwriters William Blair, Stifel, Canaccord Genuity

Deep Fission became a visible IPO filer on May 20, 2026, when Renaissance Capital reported a public filing and specified that the company had confidentially filed on April 22, 2026.

2026-04-22 · CONFIDENTIAL-F7ADF6522DC2987DAA3D

Comparable Deals

Not enough completed IPOs with similar characteristics to show comparables yet.

Recent News

Small modular nuclear reactor developer Deep Fission files for a $150 million IPO

Renaissance Capital · 2026-05-20T00:00:00.000Z