What Are Call Options?

A call option is the right to buy 100 shares of a stock at a fixed price on or before a set date. You pay a premium for that right, and you are never obligated to use it. If the stock climbs above your fixed price, the call gains value. If it never does, the most you can lose is the premium you paid.

The clearest way to learn a call is to watch one real contract move. This post pins a single SPY call: the $740 strike expiring June 18, 2026, traced from May 1 through its final week. SPY is the ETF that tracks the S&P 500, so this call is a bet that the index rises above 740 before that date.

The four things that define a call

Every call is described by four terms:

• Strike price: the fixed price you may buy the shares at. Ours is $740.
• Expiration: the last day the right is valid. Ours is June 18, 2026.
• Premium: what the call costs, quoted per share. A $7.22 quote costs $722 for one contract.
• Multiplier: one contract controls 100 shares. Quotes are per share, so multiply by 100 for the real dollar figure.

Here is the whole life of that one call, indexed so both the stock and the option start at 100 on May 1. Watch how little SPY moves against how far the call travels:

WITH d AS (
  SELECT date, avg(underlying_close) AS spy, avg(option_close) AS call
  FROM global_markets.options_greeks
  WHERE ticker = 'O:SPY260618C00740000' AND date BETWEEN '2026-05-01' AND '2026-06-15' AND implied_volatility > 0.02
  GROUP BY date
)
SELECT date,
       round(100 * spy / first_value(spy) OVER (ORDER BY date), 0) AS spy_indexed,
       round(100 * call / first_value(call) OVER (ORDER BY date), 0) AS call_indexed
FROM d
ORDER BY date

That single contract carried 31 trading sessions of history. The stock line stays almost flat; the call line whips from far above its start to well below it and back. Same underlying, wildly different ride.

Intrinsic value vs time value

A call's price splits into two parts. Intrinsic value is what the right is worth if you exercised it this instant: the stock price minus the strike, or zero when the stock sits below the strike. Time value is everything else you pay, the premium for the chance the stock climbs further before expiry.

On May 1, SPY at $720 sat below the $740 strike, so the call's intrinsic value was $0. All $7.22 of its price was time value: pure hope, no floor. By June 2, SPY had run to $759.63, roughly $20 above the strike, and intrinsic value had grown to $19.63 of the $23.5 price. Time value had shrunk to $3.87.

SELECT date,
       round(option_close, 2) AS call_price,
       round(greatest(underlying_close - 740, 0), 2) AS intrinsic_value,
       round(option_close - greatest(underlying_close - 740, 0), 2) AS time_value
FROM global_markets.options_greeks
WHERE ticker = 'O:SPY260618C00740000'
  AND date IN ('2026-05-01', '2026-05-14', '2026-06-02', '2026-06-10', '2026-06-15')
  AND implied_volatility > 0.02
ORDER BY date

As June 18 approached, time value drained toward zero: the closer to expiry, the less runway remains for another move. By June 15, three sessions from the end, the $15.41 call held just $1.5 of time value. That daily bleed is time decay, one of the option greeks, and when an option expires sets how fast it bites.

In, at, and out of the money

Traders label a call by where the stock sits against the strike:

• Out of the money: stock below the strike. Intrinsic value is zero, the price is all time value.
• At the money: stock roughly at the strike.
• In the money: stock above the strike. The call carries real intrinsic value.

Our call started out of the money, with SPY at $720 against a $740 strike. It crossed into the money as SPY rallied through 740, then fell back out on June 10, its $3.17 price once again pure time value with $0 intrinsic. Where a call sits on this scale drives how it behaves: an out-of-the-money call is nearly all bet, an in-the-money call moves closer to the stock itself. That sensitivity to the stock is option delta.

Why calls magnify moves (leverage)

A call controls 100 shares for a fraction of their price, so its percentage swings dwarf the stock's. The pinned contract is a clean demonstration.

WITH m1 AS (SELECT underlying_close AS spy, option_close AS call FROM global_markets.options_greeks WHERE ticker = 'O:SPY260618C00740000' AND date = '2026-05-01'),
     m2 AS (SELECT underlying_close AS spy, option_close AS call FROM global_markets.options_greeks WHERE ticker = 'O:SPY260618C00740000' AND date = '2026-06-02')
SELECT instrument, start_price, end_price, pct_change FROM (
  SELECT 'SPY stock' AS instrument,
         round((SELECT spy FROM m1), 2) AS start_price,
         round((SELECT spy FROM m2), 2) AS end_price,
         round(100 * ((SELECT spy FROM m2) - (SELECT spy FROM m1)) / (SELECT spy FROM m1), 1) AS pct_change,
         1 AS o
  UNION ALL
  SELECT 'SPY 740 call',
         round((SELECT call FROM m1), 2),
         round((SELECT call FROM m2), 2),
         round(100 * ((SELECT call FROM m2) - (SELECT call FROM m1)) / (SELECT call FROM m1), 1),
         2 AS o
) ORDER BY o

Between May 1 and June 2, SPY rose 5.5%, from $720 to $759.63. Over the exact same stretch the call rose 225.5%, from $7.22 to $23.5. A modest move in the stock became a huge one in the option.

That multiplier runs both ways. When SPY dropped through early June, the call gave nearly all of it back, falling to $3.17 by June 10. Leverage amplifies losses at the same rate it amplifies gains, and an out-of-the-money call can expire at zero while the stock is barely lower. The amplification tightens as expiry nears and volatility rises, the territory of 0DTE options and implied volatility.

FAQ

What is a call option in simple terms?

It is the right, not the obligation, to buy 100 shares of a stock at a fixed strike price before a set expiration date. You pay a premium for that right. If the stock rises above the strike, the call gains value; if it does not, your loss is capped at the premium.

What happens to a call option at expiration?

If the stock is above the strike, the call is worth its intrinsic value (stock minus strike) and is typically exercised or sold. If the stock is at or below the strike, the call expires worthless and the premium is gone.

Why did the SPY call move so much more than SPY?

One contract controls 100 shares for a fraction of their cost, so the call's percentage swings far outrun the stock's. The pinned call rose 225.5% while SPY rose 5.5% over the same weeks.

What is the difference between intrinsic value and time value?

Intrinsic value is what a call is worth if exercised now: stock price minus strike, floored at zero. Time value is the rest of the premium, paid for the chance of a further move before expiry. Time value fades to zero by expiration, leaving only intrinsic value.

Run the pinned queries above on the Strasmore terminal to trace any call through its own life.