Source: Katona, Painter, Patatoukas & Zeng (2025) — “On the Capital Market Consequences of Big Data: Evidence from Outer Space”
This is one of those risks that sounds abstract until you imagine explaining it after the fact. Then it suddenly becomes very concrete, very expensive, and very difficult to hide behind a slide deck.
Alternative data — information about company performance derived from sources outside traditional financial reporting — has become one of the defining features of modern quantitative investing. Satellite imagery is one of the most striking examples. Hedge funds have used satellite data to count cars in retailer parking lots, track crude oil tankers, and monitor construction activity, all to gain advance intelligence on company performance before earnings announcements. This paper studies what happens to capital markets when sophisticated investors gain access to this kind of data — and the findings are not entirely reassuring. Using the introduction of satellite coverage of major retailers, the researchers show that sophisticated investors with satellite access developed profitable trading strategies, particularly targeting retailers about to report bad news. Informed short-selling increased around quarterly reports for retailers with satellite coverage. Individual investor buying activity became less informed — these investors traded against the sophisticated players at a disadvantage. And stock liquidity declined for covered retailers. The mechanism is straightforward: satellite data creates a new, legally obtained but privately held information channel. Investors without access trade against it. The result is increased information asymmetry — exactly the opposite of what disclosure regulation aims to achieve.
In plain English, that is why the result matters beyond the chart. It changes where people should look, what they should question, and which comfortable assumption probably needs to be retired.
My takeaway: the danger is rarely the dramatic thing in the headline. It is the quiet gap between knowing a risk exists and assigning someone to do something about it. Very unglamorous. Very important.