AI firms have sold $300 billion of stock in 2026, with $100 billion more on tap

The $300 billion figure sits alongside two other capital-markets events from the same week. OpenAI's $11 billion first close came at a $1.25 trillion valuation, below its $1.4 trillion target, while Anthropic placed a $3.4 billion order for OnePWR generators — spending that sits on the capex side of the same balance sheet that share sales are meant to fund. Read together, the week shows AI firms raising equity and committing capital at the same time.

The structure of the $300 billion matters too. Mandatory convertibles force conversion into equity at maturity rather than leaving the choice with the holder, so a portion of the total is stock issuance that will land regardless of how investors feel later. That makes the remaining ~$100 billion pipeline a question of price as much as volume, as Alex Eichenstein noted in The Information.

Anthropic's IPO roadshow, reported for the week ahead, is the next point where that appetite gets tested. Its raise has been reported at up to $100 billion, separate from the $300 billion already priced.