Strike Price: Chosen From a List
The strike price is the price at which an option lets you buy or sell the underlying asset. It is selected from a fixed list set by the exchange, and how far it sits from the current price decides both what the contract costs and how likely it is to finish with any value.
How it works
The strike is the price written into the contract. A call lets you buy at it; a put lets you sell at it, regardless of where the market has gone.
The available strikes are set by the exchange. A fixed ladder at regular intervals, tighter near the current price and wider further out — you pick from the list rather than naming a number.
Where it sits relative to the market decides everything. A call with a strike below the current price already has value; one above it has none yet, and the whole premium is a bet that it will.
What distance costs
Distance is the price. A strike far from the market costs very little, which reads as good value and is the market’s estimate that it will probably not be reached.
Cheap means unlikely, not underpriced. The premium falls with distance because the probability falls with distance, and both fall together in a way that leaves very little free.
Delta is a usable shortcut for that probability. A contract with a delta near 0.30 is roughly the market’s view that there is about a thirty percent chance of finishing past the strike. It is an approximation and it is close enough to reframe every strike choice as a probability question.
Where strikes cluster
The ladder sits on round numbers. Which is one honest mechanism behind round-number levels mattering on a chart — a great deal of open interest genuinely sits at those prices.
Hedging activity pulls price toward heavily traded strikes at expiry. Market makers adjusting positions as expiry approaches buy and sell in a way that tends to hold price near a large strike, which is the mechanism behind what traders call pinning.
In practice
Volume is not spread evenly across the ladder. A handful of strikes carry almost all of it, and the rest have wide spreads and poor fills.
Time and distance both cost premium. A further expiry raises the price of every strike, because there is more time for price to reach it.
A gap can clear several strikes at once, which is the case where a distant strike pays and the reason the cheap contracts occasionally work.
A stop on the contract behaves differently from one on the share. The option price moves at a fraction of the share’s move and decays independently, so a level chosen on the share chart does not translate.
Costs apply per contract. Beginners price the premium and forget the gap between bid and ask on it. Say a contract is quoted at $1.00 bid and $1.10 ask: buying and selling straight away loses $0.10, about 9% of the price paid, before any commission — and thin strikes carry wider quotes than that.
Choosing a strike is really choosing between two things you cannot have at once: probability and payoff. A strike close to the current price is likely to be reached and pays little when it is; a distant one is unlikely and pays a great deal. The premium is set so that neither is obviously better.
Which means the choice should follow from the view rather than from the price. A view that price will drift slightly higher wants a near strike; a view that something specific will cause a large move wants a far one. Buying a distant strike because it is affordable is choosing the payoff without having the view that justifies it, and it is the most common way money leaves an options account.
There is a third dimension people leave out: what the position does if you are right but slow. A near strike with a short expiry can be correct in direction and still expire worthless, because the move arrived a week late. Match the expiry to how long you think the move needs, then pick the strike from the probability — in that order, because reversing it produces a position nobody chose deliberately.
What a strike price is not
It is not negotiated. It is picked from a fixed ladder.
It is not a target. It is a threshold with a price attached.
It is not cheap because it is underpriced. It is cheap because it is unlikely.
And it is not where the option becomes profitable. Breakeven is further.
How this connects
Theta falls hardest on strikes near the current price. Those contracts carry the most time value, so they lose the most in points each day, while distant strikes lose less in points but a larger share of their small premium.
Gamma is also highest near the money, which is why a close strike’s delta changes fastest as expiry approaches.
The volatility smile gives each strike its own implied volatility. Distant puts on shares usually price richer than equally distant calls, so the premium ladder is not a simple function of distance.
The options chain lays the whole ladder out, with quotes and open interest for each strike, which is where the liquidity check above gets done.
Spreads are built by choosing two strikes. A vertical spread buys one and sells another, and the gap between them sets both the maximum gain and the maximum loss.
Gamma exposure maps dealer hedging strike by strike, which is the pinning mechanism described above turned into a measurement.
Sellers choose differently. In a covered call or a cash-secured put the strike is the price you agree to trade at if assignment happens, so it has to be a price you would genuinely accept.
And rolling options changes the strike after the fact, which is a new decision rather than an adjustment.
When it fails as a choice
A range is where distant strikes go to die. Price moves constantly, arrives nowhere, and the contract expires worthless while the underlying finished where it started.
The second failure is confusing the strike with breakeven. Reaching the strike is not profit — the premium paid has to be recovered on top.
A third is buying the cheapest strike. Low cost and low probability are the same fact stated twice, and the market prices far strikes cheaply for a reason.
A fourth is trading an illiquid strike. The spread on a thinly traded one can exceed the edge in the idea.
And a fifth is ignoring the expiry when choosing. Strike and time are two dimensions of one decision, and choosing them separately produces contradictions.
The original data
Of the 24,971 trading and investing videos in this site’s corpus, 5 have “strike price” in the title at a median of 12,476 views across 5 channels, with a maximum of 224,460. “Option” or “options” more broadly returns 1,061 at a median of 9,476 across 594 channels, and “in the money” returns 8 at a median of 22,557. These are distinct-video counts, and overlap between the searches was stripped out before counting.
The question: Two strikes, half the price. Which one?
1,061 options videos at a median of 9,476 views against five on the strike itself at 12,476 is the pattern across this whole subject. The topic is saturated and the specific mechanics that decide outcomes are not. Before choosing a strike, read its delta and say the probability out loud — “the market thinks there is roughly a one-in-five chance of this finishing past the strike” is a far more useful sentence than “this one is cheaper”.
Related
Options is the wider introduction to the instrument. In the money covers what happens once the strike is passed. And call option is the contract type most people meet first.
I read delta as a rough probability, which is the most useful thing to know about options. A contract with a delta of 0.20 is the market saying roughly one chance in five. That reframes a cheap option from a bargain into a long shot priced as one.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.