PositionOpened

PositionOpened represents a position having been opened. The ExecutionEngine emits it when a fill creates a new position (see From fill to position). Handler: on_position_opened.

Fields

PositionOpened shares the position event field set. See Position event fields for the full matrix across the three events. The fields that distinguish PositionOpened:

At open, closing_order_id is None, and avg_px_close and realized_return are zero.

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} "
        f"@ {event.avg_px_open}",
    )

Related guides

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