An order to buy or sell immediately at the best available price. Guarantees execution but not price. Dangerous for options with wide bid-ask spreads.
⚡ KEY TAKEAWAY: Never use market orders on options. Wide spreads mean you could fill $0.30+ worse than mid. Always use limit orders.
Why It Matters
Market orders guarantee execution but not price. In options, where bid-ask spreads can be $0.30-$1.00+, a market order can cost you 10-20% of the option's value in slippage instantly.
How It Works
A market buy hits the ask; a market sell hits the bid. In liquid names (SPY), the damage is small ($0.01-0.03). In illiquid names, the spread is wide and a market order fills at the worst side.
Example
Option shows bid $2.50, ask $3.00. Market buy fills at $3.00. Limit buy at $2.75 might fill in 30 seconds. That $0.25 difference is $25 per contract — real money on 10 contracts.
Common Mistakes
Using market orders to close positions in a panic. Fast-moving markets + wide spreads = terrible fills. Even in urgent situations, a limit order $0.05-0.10 past mid will fill fast without giving away the spread.
An order to buy or sell immediately at the best available price. Guarantees execution but not price. Dangerous for options with wide bid-ask spreads.
Why does Market Order matter for premium sellers?
Never use market orders on options. Wide spreads mean you could fill $0.30+ worse than mid. Always use limit orders.
How does Market Order work?
A market buy hits the ask; a market sell hits the bid. In liquid names (SPY), the damage is small ($0.01-0.03). In illiquid names, the spread is wide and a market order fills at the worst side.
What are common mistakes with Market Order?
Using market orders to close positions in a panic. Fast-moving markets + wide spreads = terrible fills. Even in urgent situations, a limit order $0.05-0.10 past mid will fill fast without giving away the spread.
