Detailed Explanation
Why It Matters:
Useful for aggressive entries without lingering partial fills; avoids "stuck" orders in fast markets.
How It Works:
Tries to fill as much as possible instantly; remainder is canceled (no resting in book).
Common Mistakes:
Using for large sizes (partial fill only); confusing with FOK.
FAQs
IOC vs. FOK?
IOC allows partial; FOK requires full or nothing.
Good for scalping?
Yes — quick, no commitment.

