Premium
プレミアム（オプション料）。オプション自体の価格で、買い手が支払い売り手が受け取る。1株あたりで表示されるため1枚では×100となる。
The premium is the price you pay to buy an option, or the amount you collect when you sell one. It is quoted per share, so a premium of 2.50 on a standard equity option actually costs 250 dollars, because one contract covers 100 shares. That single number bundles together intrinsic value (how far in the money the option already is) and time value (what the market charges for the remaining chance of a favourable move).
In practice, buyers want the premium to be cheap relative to the move they expect, while sellers treat it as income they keep if the option expires worthless. If you buy a call for 3.00, the stock has to rise enough to cover that 3.00 before you break even, not just past the strike. Sellers, on the other hand, watch theta slowly erode the premium in their favour day after day.
A common mistake is treating a low premium as automatically cheap. A far out of the money option can cost very little and still be a poor bet, because the probability of it ever paying off is tiny. Always weigh the premium against the odds and the size of the move it needs, not against the raw dollar figure alone.
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。