Side-by-side IPO readiness, funding history, and valuation comparison. Data sourced by TechStackIPO.
Scores, valuations, and signals for SpaceX, X-Energy, and 370+ companies. 5-min read every Tuesday.
Aerospace and defense company. Active S-1 filed April 1, 2026 targeting $75B Nasdaq IPO in June 2026 at $1.75T–$2T valuation — largest IPO in history. $15B combined revenue (SpaceX + xAI merger). Starlink: $10B revenue, 10M subscribers. Government contracts with NASA and DoD. 30% retail allocation.
| Industry | Aerospace & Defense |
| Stage | IPO Filed |
| IPO Status | Private |
| Valuation | $1.75T – $2T |
| Total Funding | $11.9B |
| Headquarters | Hawthorne, CA |
X-Energy is a nuclear energy company developing small modular reactors (SMRs) and TRISO-X fuel. Amazon-backed and DOE-funded, filed S-1 with SEC on March 20 2026 targeting $1B raise on Nasdaq under ticker XE. Partners include Talen Energy, Dow Chemical, and Centrica.
| Industry | Nuclear Energy |
| Stage | Public |
| IPO Status | Public |
| Valuation | $3.5B |
| Total Funding | $1B+ |
| Headquarters | Rockville, MD |
SpaceX is valued at $1.75T – $2T. X-Energy is valued at $3.5B. Both valuations are based on the most recent private funding rounds tracked by TechStackIPO.
SpaceX has raised $11.9B. X-Energy has raised $1B+.
SpaceX is currently private. X-Energy is currently already public. Track both on TechStackIPO for S-1 filings and IPO announcements.
SpaceX operates in Aerospace & Defense, while X-Energy operates in Nuclear Energy.
SpaceX is a Aerospace & Defense company valued at $1.75T – $2T with $11.9B raised. X-Energy is a Nuclear Energy company valued at $3.5B with $1B+ raised. See TechStackIPO's full side-by-side comparison for IPO readiness scores, funding timelines, and investor data.
Accredited investors can access pre-IPO shares in SpaceX and X-Energy through secondary market platforms, pre-IPO funds, and broker-dealer platforms that facilitate private company transactions. TechStackIPO's marketplace section tracks available access options for both companies. Pre-IPO investments carry higher risk and limited liquidity.