Three Tech Giants Top 45 Years of IPO Values Combined

Three companies account for more than $5 trillion on paper, a figure that exceeds the combined first-day valuations of 3,365 U.S. technology companies that went public from 1980 through 2025. But the comparison joins unlike measures: SpaceX’s public-market value, a reported fundraising valuation for OpenAI, and a possible IPO valuation for Anthropic.

The figures are roughly $2 trillion for SpaceX, more than $1.2 trillion for OpenAI in a funding round under discussion, and a potential $2 trillion for Anthropic. Together, they come to about $5.2 trillion, against $4.1 trillion for the historic group, based on data compiled by University of Florida professor Jay Ritter. That $4.1 trillion represents companies’ market values at the close of their first trading days, not the amount they raised in IPOs.

The distinction matters. A company’s valuation measures the implied value of all its shares; an IPO raises cash only by selling newly issued shares, existing shares, or both. The total valuation attached to a listing can therefore vastly exceed the proceeds available to the company or selling shareholders. SpaceX, which went public in June, already has a traded share price. Anthropic’s $2 trillion figure remains an expectation, while OpenAI’s $1.2 trillion figure is tied to private financing talks, not a public offering.

The timetable is uneven, too. OpenAI chief executive Sam Altman has said the company does not plan to go public in 2026, pushing a possible IPO into 2027. Anthropic has been moving toward a listing, though reports have put its timing in flux. That leaves investors weighing very different kinds of price signals: a live market quote for SpaceX, a proposed private-round valuation for OpenAI and an anticipated IPO price for Anthropic.

The bigger test is whether public markets will validate those expectations once investors can scrutinize the companies’ financials and trade their shares. A high valuation is not the same as a huge public float, and early IPO lockups can limit how much stock is available to trade. Cambridge Associates has warned that offerings of this scale may also divert attention and capital from smaller companies seeking to list. For venture investors, the prospect is double-edged: blockbuster listings could create a path to liquidity, but they also underline how much capital and investor appetite are clustering around a tiny number of companies.