Ananke AlphaResearch Note No. 006 — The Index Absorption Rate
The Palantir buying that happens by mandate, not conviction.
Since it joined the S&P 500, Palantir has had a second, silent shareholder that never reads an earnings call: the index machine. Every dollar into a broad-market fund is split across its holdings by a rule, and a fixed slice of that rule belongs to PLTR — bought or sold on a schedule, at whatever price the tape prints. This note calculates that mechanical slice: the dollars passive vehicles are obligated to route into Palantir's limited float, and the quarterly dates on which the obligation resets.
- The absorption rate— roughly half a cent of every S&P 500 dollar routed to PLTR by rule, and what that becomes across the ~$13T that tracks the index
- The mandated holders— S&P and Nasdaq-100 trackers, momentum funds, and the float-true-up flow, with the block each is obligated to hold
- Why a thin, multi-class float makes a half-percent weight bite — and why the rebalance date is the crowded part, not the edge
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Written by a former institutional derivatives trader turned technologist — 11+ years of it, most recently in AI, now building research like software. Every figure is drawn from public index methodology and fund disclosures — arithmetic, not opinion.