Binance’s SOXL Weekend Rule Allows Mark to Fall More Than 3%

Binance’s SOXLUSDT perpetual can fall more than 3% from an earlier mark during a weekend while staying within the exchange’s stated mark-to-index band, because the index itself can move while U.S. shares are closed.

The rule sets a 3% deviation constraint in either direction between the mark and index for equity-based perpetuals during weekends and holidays. It compares two prices at the same time. It does not cap a move from an earlier mark or a trader’s loss, and Binance can revise the constraint during extreme market conditions.

Binance switched these contracts from a fixed weekend index to Orderbook EWMA mode on May 16, 2026. Under that method, order-book prices feed an impact midpoint, which is smoothed over time. The index can therefore move when the ETF shares underlying the contract are not trading.

For SOXLUSDT, a falling index can pull the mark lower without breaching the stated band. A decline measured from the beginning of an hour and a mark-to-index gap measured later answer different questions. Checking the band alone cannot establish how much a position gained or lost.

Binance uses the mark to calculate unrealized profit and loss and as part of its liquidation checks. Liquidation occurs when a position’s collateral falls below the required maintenance margin. The mark-to-index gap alone does not determine whether that condition has been met.

SOXL, the Direxion Daily Semiconductor Bull 3X ETF, aims for 300% of the NYSE Semiconductor Index’s daily performance before fees and expenses. Binance’s separate SOXLUSDT perpetual trades around the clock and launched with leverage of up to 20x. The contract does not give its holder ETF shares; the ETF’s daily leverage and the perpetual’s available leverage are features of different products.

The weekend band measures the gap between the contract’s mark and its current index, not the mark’s decline from an earlier price.