Call Writer

A call writer is someone who sells a call option instead of buying one. A call option normally gives its buyer the right, but not the obligation, to buy a stock at a fixed price (called the strike price) before a certain date. The writer is the person on the other side of that trade — they are the one who takes on the obligation.

When you write a call, you collect a payment upfront called the premium, from the buyer. In exchange, you promise that if the buyer decides to exercise their option before it expires, you will deliver the stock to them at the agreed strike price, no matter how high the stock has actually risen. If the stock never rises above the strike, the option typically expires worthless, the buyer walks away, and the writer simply keeps the premium as profit.

The nuance that trips people up is the difference between "covered" and "naked" call writing. If you already own the underlying shares and write a call against them, you are covered — worst case, you just have to sell shares you already hold, at a price you agreed to. If you write a call without owning the shares, you are naked, and your potential loss is theoretically unlimited, because you may have to buy the stock at whatever price it has risen to, just to hand it over at the lower strike price. Brokers treat these very differently in terms of required collateral, known as margin.

Writing a call is a bet, implicitly, that the stock will stay flat or fall, or at least not rise past the strike before expiration. It is a common way to generate income from shares you already hold, but it caps how much upside you can capture if the stock takes off.