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Volume

出来高。その日に取引されたオプションの枚数で、ある権利行使価格が今どれだけ活発かを示す。

Volume is the number of option contracts that have actually changed hands during a given trading session. It resets to zero at the start of every day, which makes it a snapshot of how much attention a particular strike and expiration is getting right now, not a running total like open interest.

In practice, traders lean on volume to judge whether a contract can be entered and exited cleanly. Say you want to buy a call on a stock and you notice the strike you like has traded 3,000 contracts today while the strike above it has traded only 4. The busier strike will almost always give you tighter bid-ask spreads and a fair fill, while the quiet one might cost you a chunk just to get in and out.

A common mistake is reading high volume as a bullish signal on its own. Volume tells you something is active, not which direction the smart money is leaning. A single large block can inflate the number, and heavy put volume can just as easily be a hedge as a bet. Treat it as a liquidity gauge first, and confirm any directional story with other evidence.

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