The Stock Market Boom Is a Boon for Billionaires

The SpaceX IPO made Elon Musk the world’s first trillionaire — and exposed the hollowness of the claim that the stock market has been democratized. Nearly 90% of stocks are owned by the wealthiest 10%, and that skew is only getting more extreme.

Elon Musk, founder of SpaceX, on screen during the company's initial public offering at the Nasdaq MarketSite in New York City on Friday, June 12, 2026.

SpaceX’s otherworldly valuation, which even some who eagerly purchased shares on its opening day admitted was “outrageous” and “stupid,” reflects the irrational exuberance that has overtaken the stock market since the introduction of AI. (Adam Gray / Bloomberg via Getty Images)


The initial public offering (IPO) of SpaceX earlier this month was historic in several ways. Not only did it instantly make Elon Musk the world’s first trillionaire, but it also shattered the record for the largest IPO in history. Overnight SpaceX became one of the biggest mega-cap companies on the stock exchange, with an initial valuation of $1.77 trillion that soared to over $2 trillion on the first day of trading. On the second day, the company jumped another 20 percent and surpassed Amazon as the fifth most valuable company on the exchange — bringing Musk’s net worth up to a ludicrous $1.4 trillion.

Looking solely at the fundamentals, SpaceX has now easily surpassed Musk’s other public company, Tesla, as the most overvalued major company in the world. The numbers almost defy belief. Because SpaceX lost almost $5 billion last year, it has been widely evaluated by its price-to-sales (P/S) ratio, which compares a company’s stock price to its revenues. This indicator first became common in the 1990s, when many of the new internet companies were operating at significant losses and therefore couldn’t be measured by the traditional price-to-earnings (P/E) ratio. Based on its opening IPO price of $135, the rocket company started trading with a P/S ratio of around 95; by its third day of trading, that number had soared to over 140.

To grasp just how ridiculous this is, it helps to look at the S&P 500’s historical average, which is 1.8 (today, with the market at a historic high, it is still only 3.7). Most stocks with a ratio over 5 are generally considered expensive. By this standard, most mega-cap tech companies are currently overpriced: Nvidia is around 20, Alphabet 10, and Amazon — the cheapest among them — is less than 4. Even the notoriously overvalued Palantir has a P/S ratio only slightly above 60. Compared to SpaceX, these are bargain prices.

Due to its losses, SpaceX technically doesn’t have a price-to-earnings ratio. Yet if we used the company’s last profitable year in 2024 — before it merged with Musk’s cash-incinerating artificial intelligence company — its P/E ratio would come out to well over 2,000. Tesla, by comparison, has an already astronomically high 335 ratio, while the highly profitable yet expensive Nvidia sits at around 30.

SpaceX’s otherworldly valuation, which even some who eagerly purchased shares on its opening day admitted was “outrageous” and “stupid,” reflects the irrational exuberance that has once again overtaken the market since the introduction of AI. It is also indicative of just how top-heavy the stock market has become, with the biggest tech companies making up an ever-growing percentage of the market’s total capitalization. The top ten companies on the S&P 500 currently comprise around 40 percent of the index’s total weight, with just seven tech companies making up nearly a third of its capitalization. The only other time the stock market came close to this level of concentration was in the era leading up to the Great Depression.

These soaring market caps at the top reflect a broader market that is stretched far beyond what historical indicators would deem reasonable. The Shiller ratio, which measures the cyclically adjusted price-to-earnings ratio, historically averages under 20 for the S&P 500; today it is over 40 for the first time since the dot-com bubble peaked at the turn of the century. Another common gauge of whether the market is overvalued is the Buffet indicator, which looks at the stock market’s total market-cap-to-GDP, revealing just how much the stock market has outpaced the real economy. While the long-term historical average for this indicator falls between 85 and 100 percent, it is now at an all-time high of over 230 percent (before the current era, the previous high was over 130 percent — also at the height of the dot-com bubble).

These and other measures all point to the same conclusion: that we are currently in the midst of a historic bubble on par with the dot-com boom and the speculative frenzy of the 1920s. The current valuations of AI tech companies are all based on the wildly optimistic earnings forecasts that read more like fan fiction than serious analysis. This year’s flurry of high-profile mega-cap IPOs — starting with SpaceX, soon to be followed by AI behemoths Anthropic and OpenAI — is a flashing sign that the bubble might be nearing its peak. For now, however, there appears to be little that can hinder the stock market’s historic, AI-fueled ascent.

A Market for the Few

The feverish optimism on Wall Street is only matched by the deep pessimism that persists on Main Street. Indeed, one of the defining features of today’s economy is the gulf in sentiment that exists between those who encounter it primarily as workers and consumers and those who experience it as investors and asset owners. For the vast majority of those who fall into the former category, the current economy is the worst it’s been in years, notwithstanding President Donald Trump’s frequent insistence that we are in the midst of an economic “golden age.”

The astronomical growth of the stock market is one of the few indicators that seems to unambiguously support the “golden age” narrative espoused by the president and his apologists, who regularly point to it as proof of a flourishing economy. According to these stock market boosters, the rising stock market directly benefits most Americans by growing their retirement savings: “Since I took office, the typical 401(k) balance is up by at least $30,000,” boasted the president in his State of the Union last March.

Trump’s market populism dovetails neatly with the GOP’s supply‑side brand, but just as Republican tax cuts have overwhelmingly benefited the wealthy, the gains from a rising stock market accrue mostly to those at the very top. For decades, the stock market has been one of the main drivers of the explosion of billionaire wealth and inequality — a trend that has now been supercharged by the AI-fueled market craze of the last several years. This reality cuts against the common claim that the stock market has been “democratized” since the 1980s, with an expanding number of Americans participating in the market due to the spread of 401(k)s, index funds, and low-commission trading.

That story contains a kernel of truth, but it obscures the fact that most public equities remain overwhelmingly concentrated in the hands of a small slice of Americans. Importantly, the greater participation in the stock market has not translated to a broader distribution of wealth. Today nearly 90 percent of the stock market is owned by just the top 10 percent of American households, while the richest 1 percent own about half of all stocks and mutual funds (roughly $25.6 trillion, half of which is owned by the top 0.1 percent). The bottom half of American households, in contrast, own just 1.1 percent of stocks. Despite claims of democratization, this concentration of ownership is up significantly from a quarter-century ago, when the richest 1 percent owned just 40 percent of the stock market.

Thus, while today over 60 percent of Americans own some shares in public companies — up from 40 percent in 1989 — the market has simultaneously grown even more concentrated. With the replacement of defined benefit retirement plans (i.e., pensions) with defined contribution plans like 401(k)s and individual retirement accounts (IRAs), more Americans directly own stocks than ever before. But this expansion has resulted more in the democratization of risk than in the distribution of wealth.

The arrival of the world’s first trillionaire last week exposed the hollowness of the “democratization” narrative. Every detail of SpaceX’s public offering illustrates how thoroughly the market has been rigged to favor the ultrarich and insiders over ordinary shareholders. From a dual‑class structure that hands Musk 85 percent of all voting power to a mandatory arbitration clause that shields the company from shareholder lawsuits, the bylaws are engineered to guarantee that Musk maintains absolute control.

Besides granting Musk ultimate power, the company’s bylaws were written to favor insiders and early investors. While lockup periods for company insiders and pre-IPO investors are typically six months, SpaceX insiders — like billionaires Peter ThielAntonio Gracias, and Marc Andreessen — will be free to start offloading some of their shares after the company’s first quarterly earnings report in late July or early August. According to an analysis by PitchBook, the SpaceX IPO may ultimately generate “more exit value than all VC-backed IPOs in the last decade, combined.”

This year’s blockbuster IPOs have drawn comparison to the late-cycle IPO frenzy of 1999, when internet start-ups raced to go public and insiders cashed out right at the bubble’s peak. As Katie Martin points out in the Financial Times, most of the IPOs that year had six-month lockup periods that expired “suspiciously close to the point at which markets turned.” Insiders, notes TS Lombard analyst Dario Perkins, “know when public investors are overvaluing the business and decide to get out when the times are good.”

Still, with the rising stock market being one of the few positive economic stories of the Trump era, the current administration is determined to keep the party going. At the Securities and Exchange Commission (SEC), the Trump-appointed chairman, Paul Atkins, has embraced the role of the market cheerleader, vowing to “make IPOs great again” and encourage “capital formation” by relaxing disclosure requirements and other regulatory standards. This has led to sharp criticisms from experts like former SEC Commissioner Caroline Crenshaw, who issued a dire warning last December shortly before her term expired:

We are moving away from financial intermediaries and gatekeepers and the professional standards that keep markets safe. . . .  I certainly wouldn’t be alone in analogizing the trend toward deregulation in this current environment to the period immediately prior to the stock market crash in 1929.

The administration has framed its deregulatory push much like the market populists of the Reagan years, leaning on the well‑worn rhetoric of “economic freedom” and “market democracy.” In one notable move, the president signed an executive order to further “democratize” investing by allowing 401(k)s to invest in risky and often illiquid “alternative assets” like private equity and cryptocurrencies. While framed as a move to empower ordinary investors and retirees, the rule change is more about granting the private equity industry access to some of the trillions of dollars in retirement savings, providing PE firms with a lifeline as wealthy investors increasingly withdraw their funds.

Once again, what is billed as the “democratization” of investing has far more to do with offloading risk than with sharing prosperity in any meaningful way.

The Right’s case for economic optimism largely rests on two assumptions: that the stock market’s gains reflect the health of the real economy, and that those gains are widely shared. Neither assumption holds up under the slightest scrutiny. The stock market’s irrational exuberance, set against a deep malaise in the real economy, points to an economic system increasingly geared toward enriching a narrow elite at the expense of everyone else. Far from democratizing the economy, the stock market has fueled the rise of an unaccountable and corrupt oligarchy.

The Buyback Era and Billionaire Wealth

The proliferation of the billionaire class over the last forty years tracks almost perfectly with the relentless rise of the stock market. In 1982, when Forbes published its first list documenting the “400 richest,” the wealthiest Americans were worth a combined $92 billion — roughly $300 billion in today’s dollars, with an average net worth of around $725 million. That same year, the SEC moved to legalize the practice of stock buybacks, which before then had been generally considered a form of market manipulation. In the years and decades that followed, public companies began issuing less dividends to shareholders — which are taxed as income — and instead used earnings to purchase their own shares, driving up stock prices.

This trend, coupled with the shareholder revolution and the tech explosion of the 1990s, helped fuel the historic growth of the stock market, enriching the biggest shareholders who conveniently no longer had to pay income taxes on their quarterly dividends. Forty years later, the practice is alive and well: in 2025, US companies purchased a record $1 trillion in their own shares, with the mega-cap tech companies like Apple, Alphabet, and Nvidia leading the way.

In Forbes’s most recent list, published last September, the 400 wealthiest Americans had a combined wealth of $6.6 trillion with an average net worth of $16.5 billion — up $1.2 trillion from the previous year. Adjusted for inflation, this represents a growth of more than 2,000 percent since the list began. In 1982, the world’s richest man was worth $2 billion; this year the world’s richest man is worth well over a trillion dollars. To put this in perspective, America’s richest man is now more than 18,000 percent richer in constant dollars than the wealthiest man was in 1982. Had the wealthiest person’s wealth simply kept pace with inflation and the GDP, he would be worth around $20 billion today.

Amid this historic inequality, any genuine effort to “democratize” the economy must start by confronting the dangerous accumulation of wealth at the top. Fortunately, the public’s growing aversion toward the billionaire class signals that Americans are increasingly ready to embrace populist proposals that would actually broaden wealth distribution and empower working people over billionaires (and trillionaires).

About a week before SpaceX made its long-awaited debut on the stock market, Sen. Bernie Sanders put forward a proposal in the New York Times that would specifically address the risk posed by mega-cap AI companies that now make up an outsize share of the American economy. The senator’s proposal would partially nationalize the big AI companies by imposing a onetime 50 percent levy to be paid for in stock, giving the public a “direct ownership stake in the largest A.I. companies in our country.” These shares would then be placed in a sovereign wealth fund, which would provide direct payments to Americans in the form of annual dividends. According to Sanders, this legislation would “guarantee that the trillions of dollars potentially generated by A.I. are used to improve the lives of all of us — not simply to make the richest people in the world even richer.”

Such a fund need not be limited to AI companies like OpenAI, Anthropic, and xAI. A broader social wealth fund — capitalized through a combination of taxes on the wealthy, corporate equity transfers, existing public assets, and other means — could provide every American with an ownership stake in the economy’s productive capital, with returns distributed as a public dividend. Matt Bruenig’s social wealth fund proposal offers the clearest blueprint for such a fund.

The approach isn’t without serious pitfalls, including the ever‑present danger of a corrupt bargain being struck between AI giants and the federal government (as would no doubt be the case in any potential deal worked out between President Trump and Sam Altman). Still, the idea of a sovereign or social wealth fund does offer a path toward a more genuine democratization of the economy, unlike the pseudo-democratization of the last four decades. At a moment when billionaire wealth is growing at historic, exponential rates while most Americans struggle with rising prices and stagnating or declining wages, every policy option should be on the table.