Quick definition
An options Greek measuring how much an option's price changes for a $1 move in the underlying stock. Delta also approximates the probability of the option expiring in-the-money.
Range and intuition
Calls run 0 to +1.00, puts run −1.00 to 0. Deep in-the-money options approach |1.00| because they move nearly dollar-for-dollar with the underlying. Far out-of-the-money options approach 0 because they have little chance of expiring in-the-money. A 0.30-delta call implies roughly a 30% probability of finishing ITM — a market-implied approximation traders use for fast strike selection.
Delta is not static
It shifts as the stock price moves, as time passes, and as implied volatility changes. The rate at which delta changes is measured by gamma. A position that looks delta-neutral at entry can develop meaningful directional exposure by the next session, which is exactly why active management matters more than entry pricing.
How Treeova uses it
Arch-AGI tracks net position delta across all open legs in an agent's portfolio, not just individual contracts. For a multi-leg structure like an iron condor, the combined delta of all four legs determines overall directional bias. Conviction Scoring weights delta-neutral structures differently from directional plays, and the Workspace displays real-time position delta per symbol so traders can monitor drift without manual math.
Risk note
Options trading involves substantial risk and is not suitable for every investor. Delta and other Greeks are analytical tools, not guarantees of outcome.