How the lock works#
Fullport's floor follows one formula at every 00:00 UTC close: floor = the higher of the old floor and (the lower of the starting balance and high-water mark − D), where D is 4% of the starting balance. The high-water mark is the highest balance recorded at a day close.
The middle part is the lock. Because the new floor can never be set above the starting balance, the floor rises with your highs until it touches breakeven and then stays there.
| Account | Lock triggers at a day close of | Floor after the lock |
|---|---|---|
| $25,000 | $26,000 or more | $25,000 |
| $50,000 | $52,000 or more | $50,000 |
| $125,000 | $130,000 or more | $125,000 |
Swipe or scroll to compare all columns.
Does an intraday high count?
No. Equity touching $26,400 at noon and the day closing at $25,700 moves the floor to $24,700, not to breakeven. The close is what matters.
What the lock changes#
Before the lock, every new closing high pulls the floor up and your room stays at D; after it, your room grows with every dollar of profit. On a $25,000 account at $27,200, the floor is still $25,000, so there is $2,200 of room rather than $1,000.
It is also why payouts work cleanly. Profit above the withdrawal buffer, start + D, can be withdrawn, and after a payout the balance resets to the buffer while the floor stays at breakeven.
So the account keeps exactly D of room after every payout. Without a lock, a trailing drawdown would keep following the top and every payout would shrink the room.
For prop traders comparing firms, ask whether the floor locks and at what level. Fullport's locks at breakeven, with no daily drawdown on top; the rules page shows the full table and the drawdown calculator runs your own numbers.
Quick answers
- Can the floor unlock after it locks at breakeven?
- No. Once a Fullport floor reaches the starting balance it never moves again, up or down, for the life of the account. From then on, every dollar of profit adds room above the floor.
- Does an intraday high lock the drawdown?
- No. The high-water mark is taken from the realized balance at the 00:00 UTC close, so the lock needs a day to close at least 4% above the starting balance. Touching that level intraday and giving it back does not count.
- Does a trailing drawdown stop at breakeven?
- Only if the firm's rules say so, so check before you buy. Fullport's does: once a day closes 4% above the starting balance, the floor reaches breakeven and stays there for the rest of the account's life.