Prop-Firm 2% Price-Limit Rules: CME Circuit Breakers

The practical answer: a 2% price-limit rule means stop trading before the exchange's actual limit, not after the market reaches it. If the applicable CME boundary is 7% above and below its reference price, the common firm buffer begins at 5% in either direction: 7% exchange limit − 2 percentage points = 5% firm stop zone.

That shortcut is useful only after confirming the current contract, month, session, direction, and firm stage. CME does not use one 7% rule for every product or every hour. A firm's 2% buffer is also separate from account drawdown and daily loss limits.

The three controls are different

A market can be far from an account's loss limit but already too close to the exchange price limit. The reverse is also possible. Treat the market boundary and the account boundary as two separate pre-trade checks.

How the 2% formula works

For a symmetric exchange limit of L and a firm buffer of 2 percentage points:

• Upper stop level: reference price × (1 + L − 0.02)
• Lower stop level: reference price × (1 − L + 0.02)

Using the firms' shared educational example, a reference price of 18,556 with a 7% exchange limit produces:

• Upper firm boundary: 18,556 × 1.05 = 19,483.80
• Lower firm boundary: 18,556 × 0.95 = 17,628.20

The published pages round those examples to 19,483 and 17,628. Do not copy those historical prices into a live order plan. The current CME table supplies the actual contract-specific reference and limit values, and the firm pages tell traders to monitor current percentage net change.

“Within 2%” in these policies is used as a two-percentage-point buffer from the exchange limit. It does not mean 2% of the trader's account balance, 2% of the contract's notional value, or a 2% permitted daily loss.

CME limits change by product and session

CME's current education page says U.S. equity-index futures have 7% up-and-down limits overnight and remain open at that boundary. It also describes a 3.5% dynamic circuit breaker during the overnight session, which can create a two-minute pause after a sufficiently fast move.

During the daytime session, CME coordinates U.S. equity futures with the cash-equity market's 7%, 13%, and 20% downside circuit breakers. The first two levels produce timed halts; reaching the 20% level closes the market for the trading day.

Other product families do not necessarily use the equity-index structure. CME lists rolling dynamic circuit breakers for energy, metals, interest rates, and cryptocurrency, with product-specific values. Agricultural contracts can use daily and expanded price limits. That is why a memorized “stop at 5%” control is unsafe outside the exact 7% case.

Firm-by-firm scope

My Funded Futures: Sim Funded and Live Funded

My Funded Futures explicitly says its 2% prohibited-conduct rule applies to Sim Funded and Live Funded accounts. Its page tells traders to stop participating when a product trades within two percentage points of the CME limit and to use the current CME table and platform percentage-net-change field.

The same source does not list evaluation accounts in its enforcement scope. Do not expand a funded-stage rule to evaluation accounts without a current MFFU source or written support confirmation. Traders moving from evaluation to Sim Funded should add the price-limit check to their stage-change checklist.

Alpha Futures: all accounts

Alpha Futures says the price-limit restriction applies to all Alpha Futures accounts, not just evaluations. Its current help page uses the same 7%-to-5% equity example and warns that a position can be trapped when trading halts.

This is the broadest explicit stage statement among the three reviewed firms. Evaluation, Qualified, Direct, and any other active Alpha account should therefore be treated as covered unless Alpha publishes a more specific exception.

Topstep: published method, public scope not stated

Topstep's current “Staying Outside the 2% Price Limit Zone” article teaches the same method: monitor percentage net change or calculate the boundary from settlement, then stop two percentage points before the applicable CME limit.

The public article does not identify which Topstep account stages the rule covers or define the account consequence in the text reviewed August 26. Traders should use the guidance as an operating boundary, then confirm the exact account-stage treatment in the current dashboard or with Topstep support rather than inventing a scope from the general explainer.

Topstep separately publishes temporary product restrictions during extreme volatility. Those position-size changes are another layer, not a replacement for the 2% boundary.

A daily pre-trade checklist

1. Identify the exact symbol and contract month—not only the product family.
2. Open CME's current price-limit table after the session update.
3. Record the reference price, upper and lower boundaries, and which hours they cover.
4. Determine whether the current contract uses traditional limits, dynamic circuit breakers, or another product-specific structure.
5. Open the firm's current rule page and identify the covered account stage.
6. Calculate the firm's inner boundary from the current exchange value; do not reuse a prior session's price without rechecking it.
7. Add percentage net change and the exchange boundaries to the trading platform watchlist.
8. Cancel or move resting orders that could execute inside the prohibited zone.
9. Repeat the calculation after a session change, expanded limit, contract roll, or exchange notice.
10. Preserve a timestamped screenshot or note showing the CME table and the account's rule source used for the session.

What to do when price approaches the boundary

Do not wait for the exchange halt. Stop opening exposure before the firm's inner boundary, review resting entry orders, and verify whether any protective exit could be affected by a limit condition. A stop order is not a guarantee of execution when the market cannot trade through its trigger price or liquidity disappears.

If the market or platform reports a pause, do not assume a reconnect or order rejection gives permission to resume. Confirm that the exchange is open, the product is outside the firm's prohibited zone, and the firm has not imposed a temporary position restriction.

If the account history shows a fill near a boundary, save the order, fill, quote, platform, CME, and firm-rule timestamps before contacting support. The platform-outage documentation guide provides a reusable evidence checklist.

Bottom line

The exchange boundary and the prop-firm boundary are not the same line. CME sets product- and session-specific price limits and circuit breakers. A firm can require traders to stop earlier. In the common 7% example, a two-percentage-point buffer begins at 5%, but that number must not be generalized to every product or session.

MFFU explicitly applies its rule to Sim Funded and Live Funded accounts. Alpha applies it to all accounts. Topstep publishes the calculation and operating guidance without stating a stage boundary on the reviewed page. Confirm the exact stage, recalculate from the current CME table, and treat account loss controls as a separate check.

For related controls, read the NQ and MNQ prop-firm guide, drawdown-rules guide, platform-incident documentation guide, and the full Topstep, My Funded Futures, and Alpha Futures reviews.

Official sources and verification

• CME current price limits — checked August 26, 2026; product-, month-, direction-, and session-specific current boundaries.
• CME understanding price limits and circuit breakers — checked August 26, 2026; traditional and dynamic circuit breakers, overnight equity limits, daytime halt structure, and product differences.
• My Funded Futures 2% Price Limit Rule — checked August 26, 2026; two-percentage-point buffer, calculation, platform check, and explicit Sim Funded/Live Funded scope.
• Alpha Futures Price Limit Trading — checked August 26, 2026; two-percentage-point buffer, calculation, and all-account scope.
• Topstep Staying Outside the 2% Price Limit Zone — checked August 26, 2026; current method, formula, and 7%-to-5% example; the public page does not state account-stage scope.
• Topstep Risk Adjustments — checked August 26, 2026; temporary product-specific position restrictions during extreme volatility.
• TradingView status, Tradovate status, CME system alerts, and CFTC releases — checked August 26, 2026; no active platform, exchange, or directly applicable regulatory event displaced this guide.