US equity markets are displaying characteristics associated with late-cycle mania, from SpaceX trading at over 90 times revenue four days after listing to call option volumes on the Nasdaq rivalling protective put demand. With S&P 500 valuations near dotcom-era peaks, the structural question for investors is whether the manic phase has arrived and how long it can persist.

Key Highlights

  • SpaceX listed at a valuation exceeding $1.8 trillion, over 90 times annual revenue, and surged to $2.5 trillion within four trading days despite reporting a $5 billion net loss in the prior year.
  • S&P 500 valuations relative to long-run earnings are approaching levels last seen at the peak of the dotcom bubble in 2000.
  • Options trading volumes in 2025 were nearly double those recorded in 2020, with same-day expiry contracts on the S&P 500 rising 3.7 times between 2021 and 2025.
  • Call option pricing on the Nasdaq has converged toward parity with protective put pricing, a historically anomalous signal of speculative dominance over institutional hedging demand.
  • The AI-driven earnings growth thesis has become near-universally accepted, removing the element of surprise that has historically supported unexpected equity returns.

The Anatomy of a Potential Bubble

For most of the past several years, a credible case could be made that American equities, while expensive, had not entered genuine bubble territory. Valuations were elevated and forward return expectations were compressing, but the defining characteristic of a true speculative bubble, an irrational, momentum-driven mania in which price and fundamental value become entirely detached, had not clearly materialised.

That assessment is becoming harder to sustain. Several data points, taken individually, might be dismissed as anomalies. Assessed together, they describe a market moving into a phase that experienced investors and financial historians recognise as the precursor to significant downside risk.

SpaceX: Revenue Multiples and the Absence of Profits

The most visible recent data point is the market reception of SpaceX (NASDAQ: SPCX) following its listing. The company priced at a valuation exceeding $1.8 trillion, a figure representing more than 90 times its annual revenue. Within four trading sessions, that valuation had expanded to $2.5 trillion, a gain of over 40% in less than a week.

The revenue multiple framing is itself revealing. Conventional equity valuation anchors around earnings, cash flow, or at minimum a credible path to profitability. SpaceX reported a net loss of approximately $5 billion in its most recent fiscal year. The investor case rests on projections that its AI-related revenue segment could expand by a factor of 100 by 2030, reaching $322 billion. That projection is not inherently impossible, but it requires a rate of business scaling that has no reliable historical precedent in any established industry.

Simultaneously, SpaceX moved to acquire an AI coding company in an all-stock transaction valued at $60 billion. Paying for acquisitions in appreciated equity during periods of elevated valuations is a pattern with a well-documented historical record across prior speculative cycles.

S&P 500: Valuations Near Dotcom-Era Extremes

The SpaceX situation would be easier to contain analytically if it represented an isolated case of single-stock excess. It does not. The S&P 500 index, measured against long-run earnings using cyclically adjusted valuation metrics, is trading at levels only marginally below those recorded at the peak of the technology bubble in 2000. That comparison is not made lightly. The dotcom peak represented the most extreme broad equity overvaluation in modern US market history, followed by a drawdown that erased roughly half of the index's value over the subsequent two years.

The consensus belief underpinning current valuations is that artificial intelligence will drive a sustained acceleration in corporate earnings across a wide range of industries. That belief may prove correct. However, the point at which a thesis becomes universally accepted is also the point at which it is fully priced, removing the capacity for positive surprise while leaving the market exposed to downside if outcomes fall short of embedded expectations.

The Options Market: From Insurance to Speculation

Perhaps the most technically precise signal of shifting market psychology comes from the derivatives market. Options serve two structurally distinct functions. In their conventional role, they operate as insurance instruments. Investors holding long equity positions purchase put options, which provide the right to sell at a predetermined price, as protection against drawdowns. This hedging demand has historically kept put option pricing above equivalent call option pricing, reflecting the asymmetric nature of market moves and the larger balance sheet size of institutional hedgers relative to speculative participants.

That structural relationship is breaking down. Options trading volumes in 2025 reached nearly double the levels recorded in 2020, itself an exceptionally active year. Within that expansion, ultra-short-duration contracts, instruments that expire within a single trading day and serve no practical hedging function, have grown at a faster pace still. Transactions in same-day expiry contracts on the S&P 500 were 3.7 times higher in 2025 than in 2021, according to CME Group data.

The consequence of this speculative volume surge is measurable in relative pricing. Call option costs on the Nasdaq have approached parity with put option costs. In structural terms, this means that the volume of directional upside bets being placed by speculative participants has grown large enough to effectively neutralise the pricing signal from institutional hedging demand, which is many times larger in aggregate balance sheet terms. When retail and momentum-driven speculation outweighs the collective hedging activity of university endowments, pension funds, and sovereign wealth vehicles in a pricing context, the market has entered an unusual and historically significant phase.

Duration Risk: The Longer the Cycle Extends, the Greater the Eventual Cost

None of this analysis implies that a correction is imminent or that the current cycle cannot extend further. Markets in their manic phases have historically demonstrated a capacity to remain detached from fundamental valuation anchors for longer than analytical frameworks suggest is plausible. The Iran ceasefire extension and associated risk-on sentiment are providing near-term support. The AI investment thesis, while fully priced, is not falsified.

The relevant investment consideration is not whether the current environment constitutes a bubble in a definitional sense, but what the risk-adjusted return expectation looks like from current valuation levels. When call-put parity converges on the Nasdaq, when a loss-making company lists at 90 times revenue and immediately gains 40%, and when broad index valuations approach the most extreme historical precedents, the distribution of forward returns shifts unfavourably.

Speculative cycles tend not to end through gradual repricing. They end through rapid sentiment shifts triggered by a catalyst that the consensus had not adequately priced. The longer the current momentum phase persists, the more leveraged and concentrated speculative positioning becomes, and the more severe the eventual repricing is likely to be.

Risk Considerations

The primary counter-argument to the bubble thesis is that AI-driven productivity gains may justify valuation levels that appear extreme against historical earnings multiples calibrated to a lower-growth environment. If the earnings growth projections embedded in current prices are realised, current valuations could prove retrospectively reasonable. The secondary risk is that tightening financial conditions, a policy error by the Federal Reserve, or a geopolitical reversal could accelerate a sentiment shift before the earnings thesis is validated or invalidated by actual results.