Micro E-mini vs E-mini Futures: Specs & Cost

Micro E-mini vs E-mini futures comes down to one number: the micro is exactly one tenth the size of the standard E-mini on the same index. MES tracks the same S&P 500 as ES, MNQ the same Nasdaq-100 as NQ, and each micro carries one tenth the multiplier and one tenth the dollar value per tick. Trading hours and the quarterly expiry cycle are identical. The two sizes match on separate order books, and that is where the practical differences begin.

What are the Micro E-mini and E-mini contract specs?

Four US equity index families list a full-size E-mini next to a micro at one tenth the size. The multiplier is the dollars of position value carried by one index point. From CME's contract specifications, verified per product rather than assumed uniform:

• S&P 500: ES is $50 per index point, MES is $5. The minimum price increment on both is 0.25 index points, worth $12.50 on ES and $1.25 on MES.
• Nasdaq-100: NQ is $20 per index point, MNQ is $2. The minimum increment on both is 0.25 points, worth $5.00 on NQ and $0.50 on MNQ.
• Dow Jones Industrial Average: YM is $5 per index point, MYM is $0.50. The minimum increment is one full index point, worth $5.00 on YM and $0.50 on MYM.
• Russell 2000: RTY is $50 per index point, M2K is $5. The minimum increment is 0.10 points, worth $5.00 on RTY and $0.50 on M2K.

The 10:1 ratio holds for every pair. The tick does not travel with it. Tick size is set per product at the exchange: a quarter point on the S&P and Nasdaq contracts, a tenth of a point on the Russell. The Dow contracts move in whole index points. One full-size tick is $12.50 on ES and $5.00 on each of the other three big contracts, so a "one tick" rule of thumb carried from ES to YM overstates the cost by a factor of 2.5. The conversion itself is laid out in futures tick size and tick value.

Notional is the multiplier times the index level. Take a round 6,000 on the S&P 500 purely as arithmetic: one ES holds $300,000 of index exposure, one MES holds $30,000. At a round 20,000 on the Nasdaq-100, NQ holds $400,000 and MNQ holds $40,000. The index level changes every session. The multiplier is fixed in the contract.

Do ten Micro E-minis cost more than one E-mini?

Ten MES carry the exposure of one ES. Crossing the spread costs the same either way: one tick on ES is $12.50, and one tick on ten MES is 10 times $1.25, also $12.50. Spread cost per unit of exposure is a wash whenever both books quote one tick wide.

Commission is not a wash. At an illustrative $0.75 per contract per side, a round trip on one ES is $1.50. The same exposure in ten MES is 10 contracts times 2 sides times $0.75, or $15.00. Identical index exposure, ten times the fee. The same point lands from the other direction at one contract each: $1.50 of commission against $300,000 of ES notional, against $1.50 on $30,000 of MES notional. Fee per dollar of exposure runs ten times higher on the micro. That is the whole micro premium, and it sits in the commission line rather than in the tick.

What the micro adds has nothing to do with cost. A 10 point move on the S&P 500 is $500 on one ES and $50 on one MES, and there is no fractional ES. Any position size below one full-size contract exists only at the micro.

Why Micro E-mini quotes drift from the E-mini

Each size is a separately listed contract with its own order book: its own bids and offers, matched independently of the other. Participants trade size between the two, which holds them close. They remain two books, and when depth thins at the open or during the week volume migrates to the next quarter, the top of one can sit a tick from the other.

What does not differ is the width of a tick. It shrinks in exact proportion to the multiplier, 0.25 index points on both ES and MES, so one tick of width costs the same per unit of exposure in either contract. What differs between the two books is the level at any given instant and the depth resting at the best price, not the width of a tick.

Same notional, different daily swing

Equal notional in ES and RTY is not equal dollar movement per day. The four indexes carry different typical ranges, and a position sized by notional inherits the range of whichever family it sits in. The panel measures the four exchange-traded funds tracking those indexes over the trailing six months through late September 2026, as a percentage of each day's opening price.

SELECT
    multiIf(ticker = 'SPY', 'S&P 500 (SPY)',
            ticker = 'QQQ', 'Nasdaq-100 (QQQ)',
            ticker = 'DIA', 'Dow 30 (DIA)',
                            'Russell 2000 (IWM)')                   AS index_family,
    round(avg(100 * toFloat64(high - low) / toFloat64(open)), 2)     AS avg_daily_range_pct,
    round(max(100 * toFloat64(high - low) / toFloat64(open)), 2)     AS widest_day_range_pct
FROM global_markets.stocks_daily_aggs
WHERE ticker IN ('SPY', 'QQQ', 'DIA', 'IWM')
  AND date >= '2026-03-30'
  AND date <= '2026-09-25'
GROUP BY index_family
ORDER BY avg_daily_range_pct DESC

Nasdaq-100 (QQQ) carried the widest average daily range in that window at 1.45% of the open, against 0.91% for S&P 500 (SPY). Carried onto futures, $30,000 of exposure in the wider family travels more dollars on an average day than $30,000 in the narrower one, at either contract size.

Margin, the quarterly roll, and settlement

Margin scales with the contract. The exchange publishes initial and maintenance requirements per contract and revises them as volatility moves, and the micro requirement tracks near one tenth of its full-size counterpart. Brokers layer house requirements on top, and many set a separate intraday rate for positions closed before the session ends. The full mechanism is in how futures margin works.

The calendar is shared exactly. Both sizes list the March, June, September and December quarterly cycle with the same month codes (how to read a futures symbol), expire on the third Friday of the contract month, and cash settle to a Special Opening Quotation of the index, calculated from that morning's opening prices in the component stocks. Nothing is delivered. The position becomes a cash mark against that single reference.

Volume migrates from the expiring contract into the next quarter across the sessions ahead of that Friday. A price series that runs unbroken across expiries is stitched together from those separate contracts (continuous futures contracts). Those settlement mornings are also among the busiest sessions of the quarter in the underlying market.

WITH daily AS
(
    SELECT
        date,
        toFloat64(volume) AS day_volume,
        avg(toFloat64(volume)) OVER (ORDER BY date ROWS BETWEEN 20 PRECEDING AND 1 PRECEDING) AS avg_prior_20
    FROM global_markets.stocks_daily_aggs
    WHERE ticker = 'SPY'
      AND date >= '2023-06-01'
      AND date <= '2026-09-25'
)
SELECT
    toString(date)                      AS settlement_date,
    round(day_volume / 1e6, 1)          AS volume_millions,
    round(day_volume / avg_prior_20, 2) AS volume_vs_20day_avg
FROM daily
WHERE toMonth(date) IN (3, 6, 9, 12)
  AND toDayOfWeek(date) = 5
  AND toDayOfMonth(date) BETWEEN 15 AND 21
  AND avg_prior_20 > 0
ORDER BY date

Across the 13 quarterly expiry Fridays in view, the most recent, 2026-09-18, printed 65.4 million SPY shares, 1.64 times the prior 20 session average. Index futures of both sizes settle on that same morning, alongside index option and single stock option expiries.

Which Micro E-minis have options?

CME lists options on the Micro E-mini S&P 500 and the Micro E-mini Nasdaq-100 futures. The Micro Dow and Micro Russell contracts carry no listed options as of September 2026. Exercising an MES option delivers one MES future, one tenth the notional of the same strike on ES, which brings a defined-risk position on the S&P 500 within reach at micro size. For the full-size version of the same choice, see SPX options vs ES futures options.

FAQ

Is a Micro E-mini exactly one tenth of an E-mini?

Yes, across all four index pairs. The multiplier and the dollar value per tick are exactly one tenth. Tick size in index points is identical on both sizes, so ten micros and one full-size contract follow the same index move to the cent.

Do ten Micro E-minis cost the same as one E-mini?

In spread cost, yes: one tick of width is $12.50 either way on the S&P 500 contracts. In commission, no. Ten micros pay ten per-contract charges on each side of the trade for the exposure of a single full-size contract.

Why is the Micro E-mini price sometimes different from the E-mini?

Each contract matches on its own order book with its own resting bids and offers. Most size trades in the full-size contract, and the micro's best price can sit a tick away when depth thins, most visibly at the open and during the roll week.

Is Micro E-mini margin one tenth of E-mini margin?

Close to it. The exchange sets the requirement per contract and revises it as volatility moves, and the micro requirement tracks near a tenth of the full-size contract. A broker can require more than the exchange minimum.

Do Micro E-minis and E-minis expire on the same day?

Yes. Both list the quarterly March, June, September and December cycle, expire on the third Friday of the contract month, and cash settle to the same Special Opening Quotation of the index.

Every panel above carries the exact SQL that produced it, so expand one to see how the number was counted. The same range and volume questions can be asked in plain English on the Strasmore terminal.