The 2026 IPO crown: SpaceX or Anthropic?
🏦 Market picks Anthropic — 59% chance of the highest first-day-close market cap this year
VS
☘️ Yarrow picks SpaceX — 65.7%
We only give Anthropic 32.3%.
A 25-point gap.
Same question, completely opposite answer. 👀
Here's Yarrow's case:
As of today, Anthropic has not filed a public S-1 on EDGAR. If Anthropic wants the 2026 IPO crown, it needs to file, roadshow, price, and list — all before December 31. That's weeks, not months. Meanwhile, SpaceX's private valuation already sits above Anthropic's, backed by Starlink revenue, launch contracts, and Starshield defense work.
One detail the market may be overlooking: xAI merged into SpaceX in February 2026 and can no longer list independently. But the venue still shows a 25.5% quote on xAI — that's a midpoint on an empty order book, not a real contender. Remove that, and SpaceX's effective odds look even stronger.
We started out the same way the market did — running the two legs as separate predictions. The probabilities added up to over 100%, which is impossible for a "who wins" race. So we rebuilt it as a single joint forecast: SpaceX, Anthropic, OpenAI, xAI, and everyone else. Probabilities sum to 100% by design.
After the correction, Anthropic moved down. SpaceX moved up.
The market is pricing the AI hype cycle. We froze the evidence chain and priced the filing calendar and the balance sheet.
When we'd adjust: Anthropic files an S-1 with a price range implying more than $2.1 trillion, or SpaceX still hasn't filed by end of October.
📅 December 31 settles it 👋
Will SpaceX have the highest first-day-close market cap among 2026 IPOs?
🏦 Market: 39% VS Yarrow: 64% ☘️
😺 What this market is really trading: if SpaceX goes public in Q4 as expected, can its first-day close beat every other IPO this year? The main rival is Anthropic, targeting an October listing.
SpaceX's private valuation already sits above $350 billion. To win, its first-day close needs to top Anthropic's debut. We see three advantages SpaceX has that Anthropic doesn't:
First, diversified revenue. Starlink, launch contracts, Starshield defense work. Anthropic is growing fast but relies mostly on API services. Wall Street tends to give a higher multiple to companies that aren't built on a single revenue line.
Second, retail demand. SpaceX is one of the most anticipated IPOs in a decade. Musk's retail following will drive first-day volume in a way that Anthropic — known mainly within the tech community — probably can't match.
Third, defense premium. Government contracts and national security relevance give SpaceX a valuation floor that pure AI plays don't have.
The market prices this at 39% — below a coin flip. We think SpaceX is the clear favorite. That said, our own analysts are split on this one, but we're sharing our reasoning for others to evaluate.
What could flip this: Anthropic lists first and its first-day close blows past $350B. Or SpaceX pushes its listing to 2027. Either event could reshape the odds entirely.