On Friday, SpaceX is expected to begin trading on Nasdaq at a valuation of $1.75tn — the largest initial public offering in history, priced at roughly 95 times sales for a company that lost $4.9bn last year. The rockets will get the headlines. The more consequential story is what the index industry did to get the stock into your pension.
In the months before the listing, Nasdaq rewrote the rules of its flagship Nasdaq-100 index. A new "Fast Entry" provision allows a sufficiently large newcomer to join within 15 trading days of its debut, replacing a three-month seasoning period that existed precisely to allow price discovery to occur before index funds were obliged to participate. The minimum free-float requirement was cut at the same time. FTSE Russell made accommodations of its own. SpaceX, it has been reported, made rapid index inclusion a condition of choosing Nasdaq over the New York Stock Exchange. Only S&P Dow Jones declined to bend, leaving S&P 500 trackers on the sidelines while an estimated $22bn-$27bn of mechanical buying from Nasdaq-100 and Russell trackers collides, within weeks, with a tradable float of perhaps 3 to 5 per cent of the company.
Consider what this means. Funds tracking these indices must sell down Apple, Microsoft and Nvidia — businesses with decades of audited cash flows — to buy a loss-making entrant whose price has been discovered for all of three weeks, in a float deliberately kept scarce. No analyst forms a view. No fiduciary weighs the odds. The purchase is compelled by a rule, and the rule was changed to compel it.
The purchase is compelled by a rule, and the rule was changed to compel it
None of this should surprise anyone who has followed the research programme that Dimitri Vayanos and Paul Woolley have built at the London School of Economics over the past fifteen years. Their central insight is that asset prices are driven not only by news about cash flows but by the flows of funds between investment managers — and that those flows are governed by the contracts and benchmarks through which asset owners delegate to agents they cannot fully observe or trust. Markets are inefficient not because investors are irrational, but because everyone in the delegation chain is behaving rationally within a structure that produces collectively perverse results.
The SpaceX episode activates every mechanism in the framework at once. Vayanos and Woolley's theory of momentum shows that procyclical flows generate price overreaction divorced from fundamentals; here the flow is not merely procyclical but guaranteed in advance, published in an index methodology document. Their later work with Andrea Buffa demonstrates that tracking-error constraints force any manager underweight a large, risky stock to buy as it rises, simply to stay within contractual bounds — amplifying the initial move and leaving the stock both more expensive and more volatile. SpaceX will arrive in the benchmark as one of the largest weights in it. Every benchmarked manager who declines to hold a $1.75tn company at 95 times sales takes career risk to do so; most will not. And the most recent strand, with Hao Jiang and Lu Zheng, shows that the rise of passive investing disproportionately inflates the largest firms upon index addition and degrades the market's capacity to correct the resulting mispricing — because the same constraints that force the buying deter anyone from betting against it.
Vayanos and Woolley called this the curse of the benchmarks: each contract is individually prudent, yet collectively the system manufactures momentum, inverts the relationship between risk and return, and pays one set of managers to distort prices while paying another to exploit the distortion. It is a coordination failure in the strict sense. No asset owner can unilaterally abandon benchmarking without bearing the full cost of deviation while others free-ride on its discipline, so all remain locked into an equilibrium that serves none of them. The faster money has already understood this: front-running the index funds into a known inclusion date, against a thin float, is among the oldest and most reliable trades in markets. The benchmarked investor is, structurally, the late-stage buyer who lets the early money out.
What is new about SpaceX is the brazenness. Flow-driven mispricing used to be an emergent property of the system; here it has been engineered, with index providers competing for listing business by loosening the very safeguards that justified treating their products as neutral measuring sticks. S&P's refusal to follow suit is welcome, but it also gives the game away: if one committee can decline to change the rules, the rules were never laws of nature. Indices are commercial products, governed by discretionary choices, and roughly $30tn of supposedly passive capital now takes its instructions from them.
The remedy does not require predicting whether SpaceX soars or craters on Friday — the framework is agnostic on the first print and damning on the structure. It requires asset owners to recognise that capitalisation-weighted benchmarks with mechanical inclusion rules are not a neutral default but an active, and increasingly gameable, investment strategy. And it requires regulators to treat index providers as what they have become: unaccountable allocators of the world's retirement savings, whose rule changes can move tens of billions of dollars without a single investment decision being made. The theory has been in the journals for a decade. This week, it is on the tape.
The writer works on applications of the Vayanos-Woolley framework of capital market dysfunctionality