Side-by-side IPO readiness, funding history, and valuation comparison. Data sourced by TechStackIPO.
Scores, valuations, and signals for OpenAI, Rebellion Defense, and 370+ companies. 5-min read every Tuesday.
OpenAI is valued at $852B — the world's most valuable AI company, backed by $27B in funding. Track IPO readiness score, funding rounds, and timeline.
| Industry | Artificial Intelligence |
| Stage | Pre-IPO |
| IPO Status | Pre-IPO |
| Valuation | $920.0B |
| Total Funding | $65.4B |
| Headquarters | San Francisco, CA |
Rebellion Defense builds AI-powered defense intelligence products for national security missions — enabling analysts and operators to process satellite imagery, signals data, and open-source intelligence at unprecedented speed. Valued at $1.2B with $300M raised, Rebellion was acquired by Palantir in 2025. The acquisition validates the defense AI market opportunity and reinforces Palantir's position as the dominant player in AI-powered defense intelligence.
| Industry | Aerospace & Defense |
| Stage | Acquired |
| IPO Status | Private |
| Valuation | $1.2B (est.) |
| Total Funding | $150M |
| Headquarters | Washington, DC |
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OpenAI is valued at $920.0B. Rebellion Defense is valued at $1.2B (est.). Both valuations are based on the most recent private funding rounds tracked by TechStackIPO.
OpenAI has raised $65.4B. Rebellion Defense has raised $150M.
OpenAI is currently pre-IPO. Rebellion Defense is currently private. Track both on TechStackIPO for S-1 filings and IPO announcements.
OpenAI operates in Artificial Intelligence, while Rebellion Defense operates in Aerospace & Defense.
OpenAI is a Artificial Intelligence company valued at $920.0B with $65.4B raised. Rebellion Defense is a Aerospace & Defense company valued at $1.2B (est.) with $150M 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 OpenAI and Rebellion Defense 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.