You can scalp MES all day, take small clean profits, and still fail a futures evaluation — because the trailing drawdown doesn’t care how your day ended, only how far you fell from your peak. The tick math and the floor math are the whole game.
How trailing drawdowns lock at a profit threshold
Both Topstep and Apex run a trailing drawdown: a floor that follows your account’s high-water mark up as you make money and does not come back down when you give profit back. Make a new equity high and the floor ratchets up behind you; the room you have to lose is measured from your peak, not from where you sit now.
The detail that changes everything for a scalper is when the trailing stops. On these firms the floor typically climbs until you’ve banked a set amount of profit, at which point it freezes — often around your starting balance level — and behaves like a static floor from then on. Until that freeze, every new high tightens the geometry against a give-back. Confirm the exact freeze point and whether the trail is measured on closed balance or intraday equity with the firm directly; these terms move and they decide how much unrealized profit drags your floor up. The trailing drawdown explainer walks the mechanics in full.
Tick value math for MES and MNQ
Micros exist so you can size risk in small, precise increments — which is exactly what a trailing floor demands. The two most-scalped contracts:
| Contract | Point value | Tick size | Dollars per tick |
|---|---|---|---|
| MES (Micro E-mini S&P 500) | $5 / point | 0.25 pt | $1.25 |
| MNQ (Micro E-mini Nasdaq 100) | $2 / point | 0.25 pt | $0.50 |
So a 10-tick stop on one MES is $12.50 of risk; the same stop on one MNQ is $5.00. Per-trade dollar risk is simply ticks of stop × dollars per tick × contracts. That number, multiplied across a losing cluster, is what you measure against the day’s room — not the comfortable single-trade figure. Drop your stop distance and contract count into the math before the session so the risk is a known quantity, not a feeling.
Why over-trading micros silently erodes the buffer
Micros feel harmless. One MNQ tick is fifty cents; the psychological brake that stops you sizing up on minis just isn’t there. That’s the trap. Commissions and a steady trickle of small losers on a high trade count erode the trailing buffer without any single trade ever looking scary.
Play it out on a trailing floor. You scalp up to a new high in the morning — the floor snaps up to match. Then you keep trading out of boredom, give back part of the morning’s gain across twenty small round-trips, and because the floor already ratcheted, that ordinary give-back walks you toward a breach while you’re still green on the day overall. You didn’t have a bad session. You had a good hour followed by an over-traded afternoon, and the geometry did the rest.
The defense is a hard trade budget and honest accounting of which trades were your setup versus filler. A scalper takes a lot of trades; the ones that kill the account are usually the ones that weren’t the plan.
Contract sizing tied to your live distance-to-floor
The professional move is to size off your current distance to the floor, recomputed each session, rather than off the account’s headline size. On a trailing account that distance changes every time you print a new high, so the room you’re risking against is a moving number.
Concretely: know your floor before the first trade, subtract it from current equity to get today’s true room, then choose contracts so that a normal losing streak — say your typical worst run of consecutive losers at your stop distance — stays comfortably inside that room. When you’re closer to the floor, you trade smaller; when the floor has frozen and you’ve built a cushion, you have more latitude. Sizing to the floor instead of the balance is the habit that separates traders who survive the trail from traders who get surprised by it.
Where Topstep and Apex differ — and why it changes sizing
The two firms are not interchangeable, and the differences feed straight back into contract size:
- How the trail is measured (closed vs intraday) determines whether an open winner you let run drags the floor up before you’ve banked it — which caps how far you’d let a scalp extend.
- The freeze threshold decides how long you’re trading against a moving floor versus a static one, which changes how conservative early sizing needs to be.
- Consistency and payout conditions differ and can quietly influence how you distribute profit across days.
Every one of these numbers changes over time and by account size, so read the current rulebook and confirm ambiguous points in writing. Compare how the trail is framed at Topstep and Apex Trader Funding side by side before you commit a sizing plan to either.
Piping the floor into an automated broker-side stop
A trailing floor that moves intraday is exactly the number a human loses track of in a fast tape — which is why the durable protection is a hard limit enforced at the broker, set a margin inside the firm’s line, that flattens you before a rising floor catches you. Shibiki tracks the moving floor, holds that line, and auto-journals every fill with live edge health per strategy on a Wilson confidence interval — so a high-frequency micro session tells you whether the edge is real or just a lucky sample. If you run futures through Tradovate, the Tradovate integration reads the fills directly so the floor tracking and journal stay live without manual entry.
Scalp the micros all you like — just size to the floor, not the balance, and let a hard limit hold the line your attention can’t.
Related: Trailing drawdown explained · Apex Trader Funding · Tradovate integration