One tick on the Micro E-mini S&P is worth about $1.25. That single number is the reason a person with a few hundred dollars and a laptop can now trade the same instrument, on the same exchange, at the same prices as a fund, just in a smaller slice.
Ten years ago the smallest S&P futures contract moved $12.50 a tick and a routine stop cost several hundred dollars. Most people were priced out. Then the exchange cut the contract into tenths, and the entire retail futures business we have today grew out of that decision.
What a futures contract actually is
A futures contract is a standardized agreement to buy or sell something at a set price on a set future date. Nothing about the definition is complicated; the useful part is what "standardized" implies.
Index futures are cash-settled. Nobody delivers an index. At expiration the difference between your entry price and the settlement price is credited or debited in dollars, so an S&P contract is a clean way to bet on where the index goes, up or down, without owning 500 stocks.
Between you and whoever took the other side sits the exchange's clearing house, which for these products is the CME. It is the counterparty to both of you, marks every account to market daily, and collects margin so neither side can walk away. That plumbing is why you can trade with a stranger at 3:00 AM and not care who they are.
The one thing to remember
A futures contract is a fixed, published unit of exposure. Tick size, tick value, hours and expiration are all set by the exchange, identical for everyone. That is exactly why a system can be tested on years of history and still mean something today: the instrument didn't quietly change under it.
Why standardization is the whole point
Every contract of a given symbol is identical, which produces three things that matter to an automated system.
- Liquidity. Because every unit is interchangeable, orders concentrate in one book. The front-month E-mini S&P complex is among the most heavily traded instruments on earth, which means tight spreads and fills that behave.
- A fixed price grid. Prices move in ticks (a minimum increment), so "risk 40 ticks" is an exact dollar figure, not an estimate. Position sizing becomes arithmetic.
- Testable history. The contract you backtest is the contract you trade. Compare that to equities, where splits, symbol changes and delistings quietly corrupt long histories.
Why index futures
You can get exposure to the S&P through an ETF, an option, a CFD or a futures contract. For a rules-based intraday system, futures win on four counts: hours (nearly 23 a day, so the reaction to a data release doesn't wait for the stock market to open), leverage that is explicit rather than borrowed from a broker, no short-selling machinery, and fee structure: a flat per-contract commission instead of a spread that widens whenever things get interesting.
There is also a tax point worth knowing about: US futures fall under Section 1256, which taxes gains 60% long-term and 40% short-term regardless of holding period. Whether that helps you is a question for a tax professional, not a blog.
The micros changed who gets in
In 2019 the CME launched Micro E-mini contracts at one tenth the size of the existing E-minis. Same index, same order book behavior, same hours, one tenth the exposure per contract.
The practical effect is that a stop that used to cost $500 now costs $50, and an account that would have been reckless at full size is sensible at micro size. Every retail-facing funded account program in US futures is built on this: the evaluation accounts at Apex Trader Funding, Lucid Trading, My Funded Futures and Tradeify all size their drawdown limits assuming you trade micros or small e-mini lots.
The main micro contracts
| Contract | Symbol | Tracks | Tick size | Tick value |
|---|---|---|---|---|
| Micro E-mini S&P 500 | MES | S&P 500 | 0.25 index points | ≈ $1.25 |
| Micro E-mini Nasdaq-100 | MNQ | Nasdaq-100 | 0.25 index points | ≈ $0.50 |
| Micro E-mini Dow | MYM | Dow Jones Industrial Average | 1 index point | ≈ $0.50 |
| Micro E-mini Russell 2000 | M2K | Russell 2000 | 0.10 index points | ≈ $0.50 |
Those values are approximate and are set by the CME, not by us or by your broker. The exchange publishes the current contract specifications and can change them; check there before you size anything that matters.
Notice that MNQ, MYM and M2K all move roughly $0.50 a tick while their tick sizes differ. The exchange picks an increment that suits the level of each index. It also means "40 ticks" is a different amount of movement on each one, exactly the detail that ruins a position size worked out from memory.
What a stop actually costs
Work it through on the MES with the S&P near 5,900.
- Notional exposure: the multiplier is $5 per index point, so one contract represents 5,900 × $5 = $29,500 of index. The full-size E-mini would be $295,000.
- A 10-point stop: 10 points is 40 ticks, so 40 × $1.25 = $50 at risk. On the full-size contract that same stop is $500.
- A 2-to-1 target: 20 points, 80 ticks, $100. That is the shape Rentabilio uses: stop and target placed in the market in the same instant as the entry, target at twice the risk.
- Commissions: roughly $1 per micro contract round turn, all-in. The published backtest deducts about 5% of gross for exactly this, which is how $274,406 gross becomes about $260,700 net.
Run those numbers against a 50k funded account with a drawdown floor around $2,500 below the starting balance and the picture gets concrete fast: at $50 of risk per trade you have room for a genuinely bad run. At $500 you have room for five. That is the entire argument for micros in one line.
Micros didn't make futures safer. They made position size a choice instead of a dare.
Long and short are the same trade
In futures there is no borrow, no locate, no uptick rule and no extra fee for going short. Selling a contract you don't own is the ordinary, symmetrical opposite of buying one, because the contract is an agreement rather than an asset that must be sourced.
For an automated system this matters more than it sounds. A rule set that can only trade in one direction sits out half the market and has half the sample size. Being able to short with a single order, on identical terms, is what lets a system take whatever the 8:30 release hands it.
Same instrument, tested day by day
More than seven years of history on micro index futures, 4,557 trades, one window a day, with the max drawdown published next to the profit. Hypothetical results from a simulation, and reproducible on your own machine.
Margin, and where people get hurt
Margin in futures is not a loan. It's a good-faith deposit (a few hundred dollars for a micro contract, sometimes far less intraday) that the exchange and your broker hold against the position. There is no interest, because nothing was borrowed.
That's also the trap. Low margin makes it feel cheap to hold ten contracts, and ten contracts on the MES is roughly $295,000 of index exposure moving against a few thousand dollars of deposit. The margin requirement is not your risk. Your stop is your risk, and if you don't have one in the market, your risk is whatever the market decides to do while you are away from the screen.
Expiration and the roll
Index futures expire quarterly: March, June, September and December. Volume migrates to the next contract about a week before expiration, and if you're still on the old one you're trading a thinning book. Automated systems handle this by trading the front month and rolling with the volume, which is a detail worth confirming on any system you buy, because a strategy that trades an illiquid back month will produce fills nothing like its backtest.
Why the 8:30 AM ET window suits them
US index futures trade nearly around the clock, roughly Sunday evening through Friday afternoon with a short daily break. The stock market opens at 9:30 AM ET, but the major economic releases land at 8:30 AM ET, and futures are already open and liquid when they do.
That hour is when a fresh number meets a market that has been drifting sideways overnight, which is why Rentabilio works one window a day and stays flat the rest of the time. The reasoning is in why 8:30 AM ET is the moment the market shows its hand, and the mechanism is on how it works.
Frequently asked questions
How much money do I need to trade a micro contract?
Brokers commonly ask for a few hundred dollars of margin per micro contract, and less for intraday positions, but margin is not the number that matters. What matters is having enough capital to absorb a realistic string of losses at your chosen stop size without being forced out. If a $50 stop feels large relative to your account, the account is too small, not the stop.
What is the difference between a micro and an E-mini?
Size, and only size. The Micro E-mini S&P is one tenth of the E-mini S&P: same index, same trading hours, same price grid, one tenth the dollars per point. Ten micros equal one E-mini in exposure, though ten micros cost more in commissions than one E-mini, which is the trade-off for the finer control.
Can I lose more than I put in on futures?
In principle yes, because futures are leveraged and a gap can move price past your stop before it fills. In practice, using resting stop orders, trading micro size, and holding nothing overnight keeps the realistic worst case close to your intended risk. On a funded account the firm's rules close the account before your losses become your problem.
Which micro contract should an automated system trade?
Whichever one it was designed and tested on, and no other. Contracts differ in volatility, tick size and behavior around news, so a system tuned on the S&P is not automatically valid on the Nasdaq. Moving a strategy to a different instrument means testing it there from scratch.
Do I need a special broker for futures?
You need a broker with a futures account and a platform your system runs on: for Rentabilio that means NinjaTrader 8. If you go the funded route, the prop firm chooses the data and execution setup for you, which removes most of the decision. The setup path is on get started, and the broader background is in our guide to how to trade futures.
In short: a futures contract is a standardized, exchange-cleared unit of exposure with a published tick value. Index futures give you long and short on equal terms, nearly 24-hour access, and a price history a system can actually be tested against. Micros cut the unit to a tenth, which turned position sizing from a dare into a decision. That is what made everything else on this site possible.
