2016issue C0555
Filter listed futures by relative liquidity and open interest
A liquidity filter keeps only listed futures whose open interest and volume can absorb the intended size. That screen then becomes an equal-dollar contract count and an effective percent margin read, so the selected market is one that can be entered and exited.
- A liquidity filter keeps a listed future only when its activity, volume, and open interest can support the intended order without inflating implementation cost.
- Open interest analysis reads outstanding contract inventory as a capacity input that scales how much size a market can reasonably absorb.
- An equal-dollar contract count and effective percent margin turn the screen into a comparable choice, so futures contract selection favors the market that can be entered and exited.
- Relative contract liquidity ranks names by required contract count, open interest, and a volume factor. Markets with the most activity marks are treated as easiest to buy and sell.
What a liquidity filter keeps
A liquidity filter is a pre-trade screen that keeps a listed future only when its activity, volume, and open interest can support the intended order without inflating implementation cost. Open interest analysis reads outstanding contract inventory as a capacity input that scales how much size a market can reasonably absorb.
Scale contracts to one dollar range
An equal-dollar contract count multiplies tick dollar value by the three-year maximum price excursion so each listed future is scaled to the same dollar range. That count is how many contracts of one future are needed to match another future's three-year dollar price range.
Effective percent margin is the dollar margin divided by the three-year dollar range of the contract, then multiplied by one hundred. It expresses margin dollars as a percentage of that three-year dollar range. Futures contract selection then chooses which listed market will carry a planned exposure after comparing executable size, equal-dollar contract counts, and margin consumed per unit of three-year dollar range.
How relative contract liquidity is built
Relative contract liquidity is a cross-market rank of how readily a future can be bought and sold, built from required contract count, open interest, and a volume adjustment. Relative futures liquidity can be ranked by multiplying contract point value, a three-year maximum price motion, open interest, and a low-activity factor that usually runs from 1 to 4. Relative contract liquidity is the equal-dollar contract count times total open interest times a volume factor.
The volume factor is a multiplier, typically from one to four, that reduces the rank of thinly traded contracts. It is the greater of 1 and the exponential of the natural log of volume divided by the natural log of 5000, minus 2.
How to read the ranking columns
Figures in each ranking column are proportional and are meaningful only when compared with other figures in the same column. Markets with the most activity marks are treated as easiest to buy and sell. Markets with one mark or none are treated as least executable.
The 2016 ranking snapshot
In the 2016 ranking snapshot, the E-mini S&P 500 occupies the top liquidity slot and the two-year Treasury note occupies the bottom slot with no activity marks.
Equity trading liquidity is framed as period volume expressed as a percentage of shares outstanding, which functions as a share-turnover rate.
Equal-dollar contract counts, May 2016 liquidity ranking

Contract count equals tick dollar value times the three-year maximum price excursion, so every name is scaled to the same dollar range. Row order is the source liquidity ranking, not a sort of this column.
All readings on this track · 51 readings
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- 2018Ranking futures by liquidity, open interest, and equal-dollar cost
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- 2020Filter futures by range-scaled liquidity and open interest