Binance’s SOXL mark fell 5.9% despite a 3% price band. Here’s why

Binance’s perpetual tied to SOXL, a leveraged semiconductor ETF, recorded a 5.9% opening-to-low fall in the mark price used for margin risk during the 21:00–22:00 UTC hour on Saturday, Oct. 17. All 60 sampled minute-close gaps between that mark and its reference index stayed below 3%. The two observations measure different risks. Binance’s published weekend band constrains the mark’s distance from the index at a particular moment. The index can move away from the trader’s entry price, leaving cumulative price exposure open. In the sampled hour, the index itself fell almost 4%. For a leveraged trader, that distinction leaves room for losses and liquidation despite a narrow mark/index gap. A reference-price safeguard and the amount of collateral keeping a position open answer different questions.

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