Positions & P&L

Once an order fills, it becomes a position. The positions view shows what you hold, what it's worth, and how it will pay off across the range of SPX prices.

What a position tracks

Each position aggregates your fills for one instrument and direction, and reports:

• Direction — long or short — and quantity.
• Cost basis — the price you opened at.
• Current price — the live mark from the option chain.
• Delta — recomputed on every time change.
• P&L — unrealized, realized, and total (see below).

Positions are computed live from your trades and the market data at the current simulation time — advance or rewind the clock and they update.

Position delta and sign

In the option chain, delta is shown unsigned. On a position, your direction supplies the sign:

• Delta — long calls positive, short calls negative; long puts positive, short puts negative.

Summing delta across all your positions gives your net delta — a quick read on your directional exposure.

P&L

Metric	Meaning
Unrealized P&L	Mark-to-market gain or loss on positions still open
Realized P&L	Locked-in gain or loss from positions you've closed and from settlement
Total P&L	Unrealized + realized − fees

When you close a position, its result moves from unrealized into your realized total. P&L is also broken out by equities vs equity options.

The payoff chart

The positions screen plots a payoff diagram — your profit or loss as a function of the SPX price, for your current set of positions. It makes the shape of a strategy obvious at a glance: the flat profit zone and capped wings of an iron condor, the breakevens of a vertical, the unlimited slope of a naked option. As the clock advances, the curve reflects the decaying time value of your 0DTE options.

Closing a position

To exit, submit the opposite actions to the ones that opened the position (sell to close a long, buy to close a short). You can close part of a position by using a smaller quantity. After the closing order fills, the position disappears from the list and its result lands in your realized P&L.

At the 4:00 PM ET close, any positions you're still holding settle automatically — see End-of-day settlement.