Will follower fills match the source price exactly?

No — and no honest copier promises that. Each follower's broker fills at its own available price, so a small difference from the source is normal, especially on fast moves. The copier sends the order quickly; it can't set the broker's price.

Why is there slippage when copying?

Spread differences, the milliseconds to dispatch plus the broker's own execution time, requotes, and fast-moving markets all mean the available price can shift a little between the source fill and the follower fill.

Does a faster copier guarantee the same price?

No. A faster copier narrows the time window between the source fill and the follower order, but the follower's broker still sets the actual price, spread and execution. Speed helps; it doesn't promise a matching fill.

What happens if a copied fill doesn't land?

On very fast trades or a brief broker outage a fill may not place. A good copier flags the not-copied order with a reason and reconciles positions when the connection recovers, so a missed fill is visible rather than silent.

Guides

Why Follower Fills Differ from the Source

A copied trade rarely fills at the exact source price — each follower's broker sets its own. Here's why fills differ and what a copier actually controls.

28 Jun 2026 · 4 min read

A copied trade rarely fills at the exact price the source got — and that's normal, not a bug. A trade copier sends the order; each follower's broker decides the price it actually fills at. Knowing why the two differ — and what a copier can and can't control — sets the right expectation before you copy across accounts.

The follower's broker sets the price

When the source opens a position, the copier dispatches a matching order to each follower. From there it's out of the copier's hands: the follower's broker fills it at its available price, against its liquidity, in its book. Two brokers quoting the "same" instrument at the same instant can still print slightly different prices.

What causes the difference

Spread — each broker has its own bid/ask, so the entry and exit differ.
Latency — the milliseconds to dispatch the order plus the broker's own execution time mean the market can move a touch before the fill.
Requotes / rejections — some brokers requote in fast conditions rather than fill at the asked price.
Fast markets & slippage — around news or gaps, the available price can be away from the source's by the time the follower fills.

Partial fills and fast round-trips

On very quick trades a follower may open and close almost back-to-back, or — if the follower's broker is momentarily unreachable — a fill may not land at all. A good copier surfaces any not-copied order with a reason and reconciles positions when the connection recovers, so a missed fill is visible rather than silent.

What a copier controls — and what it can't

A copier controls how fast the order is sent: dispatching over real-time streams the moment the source fills is faster than polling on a timer. It does not control the broker's price, spread or execution. So a faster copier narrows the time window — it doesn't guarantee a matching price. No honest copier promises identical fills, and any tool that claims to is overselling.