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This paper studies hedge funds’ arbitrage positions in the Treasury cash-futures basis trade, which profits from the disconnect between cash and futures prices. At times, the trade has surpassed $1 trillion in gross exposures. Basis traders consistently account for more than 60% of all hedge fund Treasury positions and 70% of all hedge fund repo. We show how frictions can introduce a positive association between arbitrage quantities and spreads, and how these frictions may propagate stress in the Treasury market during periods of instability such as in March 2020.