The SpaceX IPO Marks "the Top of a Terrific Bubble," According to This Famous Wall Street Veteran

GMO co-founder Jeremy Grantham warns the SpaceX (SPCX) IPO could mark the peak of the bull market, arguing the stock is a speculative “BS story” rather than a value-driven investment. He highlights that SpaceX is unprofitable (net loss of ~$4.3B in 1Q 2026 vs nearly $5B lost in all of 2025) and says a bear market could compress shares from ~$160 to ~$63, cutting the firm’s ability to raise capital. The article implies elevated risk from valuation compression and ongoing large cash needs, with Goldman Sachs projecting negative free cash flow of ~$105B in 2029.

Analysis

This is less a SpaceX-specific call than a read on the cost of capital for high-optionality stories. If investors start demanding cash-flow proof instead of narrative, the first casualty is not the private asset itself but the ecosystem of public “Musk premium” exposure, with TSLA the cleanest liquid proxy because a chunk of its valuation still rests on future optionality rather than current earnings power. GS is a milder read-through: a colder late-stage funding market would trim fee pools and delay exits, but that is a business mix headwind, not a balance-sheet event.

The key timing is 1-3 months for sentiment contagion and 6-18 months for financing dilution. The market’s real test is whether private marks continue clearing at rich levels; if the next raise prices with even a modest discount, the scarcity value of the story drops and future capex becomes more punitive. That would compress the multiple not just on this name but on adjacent frontier-tech duration trades, especially anything priced off a “best-case narrative” rather than near-term free cash flow.

Contrarian view: the bearish case may be overstating public-market dependence. A profitable core can fund a surprising amount of optionality, and strategic capital can be less cyclical than venture money. The signal to watch is not commentary from a value investor; it is whether secondary demand, convertible markets, and crossover books still clear at scale without concessions. If they do, the thesis is mostly noise; if they do not, the repricing can be abrupt and self-reinforcing.

Key Decisions for Investors

• Use TSLA as the liquid expression of any Musk-premium de-rating: initiate a 1-3 month tactical put spread only on strength, with risk/reward favored if the stock starts underperforming QQQ by >3-5% after the next risk-off tape.
• Keep SPCX as a sentiment alert, not a trade. Falsify the bearish thesis if the next private financing/secondary clears near current marks with strong oversubscription; that would confirm capital remains available for speculative capex.
• Trim GS only modestly, or hedge it versus a financials basket, if capital-markets activity rolls over. The setup is a fee-pool headwind over months, not a direct credit risk, so the upside to an aggressive short is limited.