2011issue C0177
Liquidity filter for futures contract selection
Listed futures can be ranked by a liquidity score that multiplies contract point value, a three-year extreme price move, open interest, and a volume factor. Contracts are then ordered from easiest to hardest to trade before equal-dollar scale and margin intensity are compared.
- A liquidity filter ranks listed futures by combining dollar sensitivity, a multi-year price excursion, activity, and a volume adjustment so thin names can be excluded before an order is placed.
- Open interest is a size-capacity input in the relative-liquidity score, so a market with little outstanding interest is treated as harder to enter and exit over the life of an order.
- Equal-dollar contract counts put every name on one dollar scale, and effective percent margin compares how much capital a name consumes relative to its historical swing.
- Each ranking column is a proportional measure and is meaningful only when compared with other contracts in the same column.
How listed futures are ranked for execution
A liquidity filter is a pre-trade screen that ranks listed futures by how readily size can be executed. It combines a contract's dollar sensitivity, a multi-year price excursion, activity, and a volume adjustment so thin names are excluded before an order is placed.
A listed-futures liquidity score can be formed by multiplying contract point value, a three-year extreme price move, open interest, and a volume factor.
Relative liquidity and open interest
Relative contract liquidity is a descending ranking formed from the equal-dollar contract count times total open interest times a volume factor. Names at the top are scored as easier to buy and sell than names at the bottom, and contracts are ordered from easiest to hardest to trade on that score.
Open interest analysis uses outstanding contract interest as a size-capacity input in that score. A market with little open interest is treated as harder to enter and exit over the life of an order.
The volume factor is an activity adjustment, typically between 1 and 4, taken as the greater of 1 and the exponential of the natural log of volume divided by the natural log of 5000, minus 2, so unusually low or high volume is not treated as equivalent.
A market with the densest liquidity marks is treated as highly active. A market with one mark or none is treated as thinly traded and harder to execute.
Equal-dollar scale and margin intensity
Futures contract selection chooses which listed futures name to trade by comparing relative liquidity, equal-dollar contract counts, and margin intensity across markets rather than treating every listing as interchangeable.
The equal-dollar contract count equals tick dollar value times the three-year maximum price excursion, so every entry in that column shares the same dollar scale. That count is the contracts to trade for equal-dollar profit: how many contracts of one futures name are needed to match another name's three-year dollar price range.
Effective percent margin equals posted margin dollars divided by the three-year dollar price range of the contract, then multiplied by one hundred. It is used to compare capital intensity across names and to show how much capital a name consumes relative to its historical swing.
Equal-dollar scale of listed futures contracts

The source defines contracts to trade as tick dollar value times the three-year maximum price excursion, so every bar is an equal-profit scale rather than a liquidity score. Relative liquidity is the separate dot ranking that sets this row order.
A share-market liquidity proxy
For shares, period volume as a percentage of shares outstanding is presented as a turnover-rate proxy for trading liquidity.
All readings on this track · 51 readings
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