Understanding · Education

Call Options

A call option is a contract that gives the buyer the right to buy 100 shares of a stock at a fixed price, on or before a fixed date. The buyer is never obliged to go through with it. If the stock does not do what the buyer hoped, the contract can simply be left to expire.

Calls are one of the two classes of stock option. The other is the put, which works the other way round and gives the right to sell. This page covers calls.

THE FOUR THINGS EVERY CALL OPTION HAS

The underlying stock. The company whose shares the contract is written on. One contract normally covers 100 shares.

The strike price. The fixed price the holder may buy those shares at.

The expiration date. The last day the contract is worth anything. A weekly option expires within days. A monthly expires on the third Friday of its month.

The premium. What the contract costs. Quoted per share, so a premium of 3.50 on a contract covering 100 shares costs 350 dollars.

Read those four together and a contract description stops looking cryptic. "NVDA Sep 11 2026 240 CALLS at 3.50" is a call on Nvidia, strike 240, expiring on 11 September 2026, costing 350 dollars a contract.

WHY A CALL GAINS WHEN THE STOCK RISES

The right to buy at a fixed price is worth more as the market price climbs above it. A call struck at 240 while the stock trades at 250 carries 10 dollars a share of real value, because the holder could buy at 240 what everyone else pays 250 for. That is called intrinsic value.

Below the strike there is no intrinsic value at all. The contract still has a price, because there is time left for the stock to move, and that part is called time value. Every option premium is those two things added together.

IN, AT AND OUT OF THE MONEY

A call is in the money when the stock is trading above the strike. It is at the money when the two are level, and out of the money when the stock is below the strike.

An out of the money call is cheaper because it is made entirely of time value and the stock has further to travel. The lower premium comes with a lower chance that the stock reaches the strike before expiration.

WHAT THE BUYER CAN LOSE

A buyer of a call cannot lose more than the premium paid. If the stock falls, stays flat, or rises too late, the worst case is that the contract expires worthless and the premium is gone. The maximum loss is known before the trade is placed.

Selling calls you do not own is a different activity with a different risk profile, and it is not what our published research does.

WHAT TIME DOES TO A WEEKLY CALL

Time value drains away as expiration approaches, and it drains fastest in the final days. This is called time decay. On a monthly contract it is a slow leak. On a weekly option it is the dominant force, because there are only days of time value to lose.

Timing matters more on weeklies than on a longer contract. A call can rise as expected and still lose money if the move comes too late. Our exit strategy page covers what that means for holding and closing a position.

WHAT MOVES THE PREMIUM

A call's price is affected by the stock price, time remaining, implied volatility and, to a lesser extent for contracts measured in days, interest rates. Time always works against the buyer.

Volatility is the one that surprises people. A call can lose value on a day the stock rose, if the market decided the stock had become calmer. Around an earnings report the reverse happens first: premiums inflate before the announcement and deflate the moment the result is known, whichever way the stock goes.

CALLS AND PUTS SIDE BY SIDE

A call buyer wants the stock to rise. A put buyer wants it to fall. Both are buying a right rather than an obligation, both pay a premium for it, and for both the premium is the most that can be lost.

Our published record contains both. Every trade we have alerted since 2020, calls and puts, wins and losses, is on the track record, with the contract, the dates and the result on each one.

WHICH STOCKS HAVE WEEKLY CALLS

Weekly options exist on a few hundred of the most heavily traded names rather than on every listed company. The list changes, and liquidity matters as much as availability, because a contract nobody is trading is hard to get out of at a fair price.

Our stock directory shows every stock we have published a trade on, with our documented record on each. The which stocks have weekly options page covers how the list is set and where to check it.

COMMON QUESTIONS

Do I have to buy the shares? No. Most traders never exercise a call. They sell the contract itself, at whatever it is worth at the time, to close the position.

What happens if I do nothing? An out of the money call expires worthless. An in the money call is normally exercised automatically at expiration by the broker, which means buying the shares, so a position worth something needs a decision before the day ends.

Why is the premium so high before earnings? Because the market is pricing in a large expected move. That inflated premium is paid by the buyer and is usually lost in the first minutes after the result.

How many shares is one contract? Normally 100. So the quoted premium is multiplied by 100 to get what a single contract costs.

WHERE THIS FITS

Understanding calls is the foundation for everything else on this site. From here, buying weekly options covers placing the trade, and weekly options strategy covers choosing which one.

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