PositionOpened

PositionOpened records the opening snapshot of a new position. The ExecutionEngine emits it when a fill creates the position (see From fill to position). Handler: on_position_opened.

Fields

See Position event fields for the complete field matrix. PositionOpened contains the opening snapshot; later events expose additional aggregate and lifecycle fields. At opening, realized PnL subtracts the opening fill's commission when that commission is denominated in the instrument's cost currency. Otherwise, it is zero. A reopened NETTING position starts a new cycle; realized PnL from the prior cycle remains in the closed position snapshot.

Its main state fields are:

Field	Python type	Description
`entry`	`OrderSide`	The entry order side that opened the position.
`side`	`PositionSide`	The current position side (`LONG` or `SHORT`).
`signed_qty`	`float`	The signed position quantity.
`quantity`	`Quantity`	The current open quantity.
`last_qty`	`Quantity`	The quantity of the fill that opened the position.
`last_px`	`Price`	The price of the fill that opened the position.
`currency`	`Currency`	The position quote currency.
`avg_px_open`	`float`	The average open price.
`realized_pnl`	`Money` or `None`	The current cycle's realized PnL in cost currency.

Example

Reading the event in a strategy handler:

def on_position_opened(self, event: PositionOpened) -> None:
    self.log.info(
        f"Opened {event.side} {event.quantity} {event.instrument_id} @ {event.avg_px_open}",
    )

Events - Event categories, dispatch, and the fill‑to‑position chain.
Positions - Position lifecycle, aggregation, and PnL.
Orders - Orders whose fills open and close positions.

PositionOpened

Fields

Example

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