Why winners get slipped more than losers
Posted: Sat Oct 31, 2026 7:38 am
Last look is the quiet reason some accounts see slippage that only runs one way. The idea is simple: after the order arrives, the liquidity provider gets a short window, often somewhere in the tens of milliseconds, to accept or reject it. During that window the market can tick. If it ticked in the provider's favour, the order fills. If it ticked against them, it may get rejected or filled at a worse price.
For a scalper this matters more than for a swing trader, because the edge lives in those same milliseconds. A scalp entered just ahead of a micro move is exactly the type of trade that gets declined, while a trade entered into a fading move gets through cleanly. Over a few hundred trades the damage shows up as winners that fill 0.2 to 0.4 pips worse than clicked, and losers that fill at or better than clicked.
Test it. Export the fills, compute slippage per trade as a signed value (positive means better for you), and split by trades that ended profitable versus not. A symmetric distribution around zero is healthy. A clear skew is worth raising with support, politely, with the numbers attached.
Has anyone actually got a broker to change anything after showing a skew like that?
For a scalper this matters more than for a swing trader, because the edge lives in those same milliseconds. A scalp entered just ahead of a micro move is exactly the type of trade that gets declined, while a trade entered into a fading move gets through cleanly. Over a few hundred trades the damage shows up as winners that fill 0.2 to 0.4 pips worse than clicked, and losers that fill at or better than clicked.
Test it. Export the fills, compute slippage per trade as a signed value (positive means better for you), and split by trades that ended profitable versus not. A symmetric distribution around zero is healthy. A clear skew is worth raising with support, politely, with the numbers attached.
Has anyone actually got a broker to change anything after showing a skew like that?