The Short Answer: No single open trade may risk more than 1.5% of your account size on Thunderbolt Classic and Vanguard, or 2% on Thunderbolt Legacy. This is the Max Trade Loss rule, and it applies to all three products.
On a $50,000 account that is a $750 cap per trade ($1,000 on Legacy). On a $100,000 account it is $1,500 ($2,000 on Legacy). It is measured on one position at a time, not on your whole day.
What the rule means
Max Trade Loss caps how much any single open position can lose. It is the potential loss on that one trade if it moves against you, measured from your entry to where your stop sits.
The formula: Max Trade Loss = 1.5% x account size (2% x account size on Thunderbolt Legacy).
This is separate from your daily drawdown and your trailing drawdown. Those limits watch your account equity over a day or over your whole run. Max Trade Loss watches one position and asks a single question: if this trade goes wrong, does it risk more than 1.5% of the account (2% on Thunderbolt Legacy)?
Your dollar cap by account size
Account size | Classic & Vanguard (1.5%) | Legacy (2%) |
$50,000 | $750 | $1,000 |
$100,000 | $1,500 | $2,000 |
Whatever your account size, take 1.5% of it (2% on Thunderbolt Legacy) and that is the most any one open trade is allowed to put at risk.
Turning 1.5% into ticks and contracts (ES and MES)
The dollar cap is only useful once you turn it into stop distance for the contract you trade. You need two numbers: the tick value of your instrument, and how many contracts you plan to hold.
ES (E-mini S&P 500): tick value $12.50, and 4 ticks make 1 point ($50 per point).
MES (Micro E-mini S&P 500): tick value $1.25, and 4 ticks make 1 point ($5 per point). MES is one tenth the size of ES, so it gives you ten times the stop room for the same dollar risk.
The math for a single contract: Max ticks = dollar cap / tick value / number of contracts.
Worked example: $50,000 account, 1.5% cap ($750)
Position | Widest allowed stop |
1 ES contract | 60 ticks (15 points) |
2 ES contracts | 30 ticks (7.5 points) |
3 ES contracts | 20 ticks (5 points) |
1 MES contract | 600 ticks (150 points) |
Check the top row: 1 ES contract with a 60 tick stop is 60 x $12.50 = $750, exactly the cap. Add a second contract and the same $750 has to be split across both, so the stop must tighten to 30 ticks. The more contracts you hold, the closer your stop has to sit. On a Thunderbolt Legacy $50,000 account the cap is 2% ($1,000), so every stop above can sit a little wider.
Worked example: $100,000 account, 1.5% cap ($1,500)
Position | Widest allowed stop |
1 ES contract | 120 ticks (30 points) |
2 ES contracts | 60 ticks (15 points) |
3 ES contracts | 40 ticks (10 points) |
1 MES contract | 1,200 ticks (300 points) |
Same logic, double the room, because the cap doubled to $1,500. One ES contract with a 120 tick stop is 120 x $12.50 = $1,500. Trading MES instead of ES on the same account gives you far more distance to work with, which is why micros are the easier way to keep any single trade inside the limit. On a Thunderbolt Legacy $100,000 account the cap is 2% ($2,000), giving you proportionally more room again.
Why this rule exists
Max Trade Loss is blowup protection. One oversized position with no stop, or a stop parked far away, can wipe out an account in a single move. A rule that no trade may risk more than 1.5% (2% on Thunderbolt Legacy) keeps any one mistake survivable.
It also builds the habit that funded trading rewards: size your position to your stop, not the other way around. Decide where you are wrong, measure that distance in ticks, then choose a contract count that keeps the dollar risk at or under 1.5% (2% on Thunderbolt Legacy). Traders who work in that order rarely trip the daily or trailing drawdown either, because their losses stay small and controlled.
Splitting a trade does not get around it
You cannot dodge the cap by breaking one big position into several smaller orders. Multiple positions on the same instrument in the same direction are treated as one trade, so their combined risk still has to stay inside 1.5% (2% on Thunderbolt Legacy). This is the same way the rule works across Upcomers: splitting a trade to sidestep a limit does not work, and the combined position is counted as one.
What happens if you breach it
Max Trade Loss is a hard rule, not a soft one like the Best Day Rule. If a single trade exceeds the 1.5% limit (2% on Thunderbolt Legacy) it triggers an automatic breach and the account is terminated, even if your overall account is still in profit at the time. There is no warning and no grace on it.
It applies in both phases: during the challenge and once you are funded. Treat it as a limit that is always live, on every order, from your first trade to your last.
Quick checklist before you enter
1. Know your cap: 1.5% x account size ($750 on $50K, $1,500 on $100K), or 2% on Thunderbolt Legacy ($1,000 on $50K, $2,000 on $100K).
2. Set your stop distance in ticks.
3. Multiply ticks x tick value x contracts. Keep the result at or below your cap.
4. If it is over, reduce contracts or tighten the stop before you place the order.
Need help?
If you are not sure whether a position fits inside your cap, work the math out before you enter, not after. Our support team is one click away in the chat if you want a second set of eyes on it.