Market maker
マーケットメイカー。常に買値と売値を提示し続ける業者で、いつでもオプションを売買できる流動性を供給する。
A market maker is a firm (or trading desk) that continuously quotes both a bid and an ask on an option, standing ready to buy from you or sell to you at any moment. Without them, most option strikes would have no one on the other side of your order, so they are the reason you can click buy or sell and get filled almost instantly. They earn the spread between those two prices and hedge the risk they take on, usually in the underlying stock.
In practice this matters most when you look at liquidity. A tight bid-ask spread, say 1.20 by 1.22, tells you a market maker is actively competing and you can enter and exit cheaply. A wide spread like 1.10 by 1.60 warns you the strike is thinly traded and every round trip will cost you.
A common mistake is placing market orders on illiquid options. You are effectively letting the market maker pick the price, and you may pay far above the true mid. Use limit orders near the mid and let the quote come to you instead.
すべてのオプション用語
教育目的のみ。気配値は約15分遅延しており、本サイトの内容は投資助言ではありません。オプション取引には多大な損失リスクが伴います。