Why Some Options Dey Cost Pass Each Other

Two options fit look almost the same. Same expiration, same distance from the money, the same 100 shares of stock wey dey under. One still fit cost several times pass the other one. The difference na implied volatility: the market own priced-in estimate of how far the stock go likely move before the option expire. Calm index fund and jumpy single-name stock carry very different expected moves, and option price carry that gap directly.

How implied volatility be the market expected move

Every listed option get implied volatility wey dey attached to am. The exchange no dey quote am. Dem dey back am out from the option own market price with pricing model, and e read as annualized percentage: rough measure of how much the market expect the stock go swing over the coming year. Higher number mean say the market dey pay up for bigger expected move. To see the range for one picture, here be six familiar names for July 6, 2026, each one dem measure across im near-the-money contracts wey go expire July 17, dem arrange from calmest to wildest:

SELECT underlying_symbol AS instrument,
       round(avg(implied_volatility) * 100, 1) AS atm_iv_pct,
       round(avg(underlying_close), 0) AS spot
FROM global_markets.options_greeks
WHERE date = '2026-07-06'
  AND implied_volatility > 0.02
  AND abs(strike_price / underlying_close - 1) < 0.05
  AND (ticker LIKE 'O:SPY260717%' OR ticker LIKE 'O:QQQ260717%'
       OR ticker LIKE 'O:KO260717%' OR ticker LIKE 'O:AAPL260717%'
       OR ticker LIKE 'O:NVDA260717%' OR ticker LIKE 'O:TSLA260717%')
GROUP BY instrument
ORDER BY atm_iv_pct

The ladder run from SPY for bottom, 13%, reach TSLA for top, 47.6%. That one close to fourfold spread for same calendar week, for options wey share expiration date and moneyness. SPY, broad index fund, hold hundreds of stocks wey moves partly cancel, and e dey for the calm end. TSLA, single stock wey routinely travel on im own headlines, dey for the wild end. For inside, KO at 20.2% and NVDA at 39.7% fill the rungs. Read the number as forecast wey the market dey willing to back with real premium, not as description of where the stock don already reach.

Implied volatility no be fixed trait of name. E dey climb ahead of known events like earnings report and e settle once the news komot. E dey rise across the whole market during selloff, when every option dey cost more at once, and e dey drift lower through quiet stretches. The snapshot wey dey above freeze one ordinary Monday, well away from any of the six names earnings dates. The ranking read as market regular view of each name, not event spike.

Same option, very different price

Option premium dey move with im implied volatility once other inputs dem hold roughly equal. Take one near-the-money call option for each of the two extremes wey dey above, both dey expire July 17, both dem price for July 6. Each call dey control the same 100 shares. If you express am as share of the stock wey e dey on, the two premiums no be the same at all:

SELECT underlying_symbol AS instrument,
       round(avg(underlying_close), 0) AS spot,
       round(avg(option_close), 2) AS call_premium,
       round(avg(option_close) / avg(underlying_close) * 100, 2) AS premium_pct_of_spot
FROM global_markets.options_greeks
WHERE date = '2026-07-06'
  AND implied_volatility > 0.02
  AND ticker IN ('O:SPY260717C00750000', 'O:TSLA260717C00415000')
GROUP BY instrument
ORDER BY premium_pct_of_spot

The SPY call cost $7.35 against $751 share, about 0.98% of the stock. The TSLA call cost $16 against $417 share, about 3.84%. Same structure, same eleven days to expiry, and several times the cost wey dem measure as fraction of the underlying. The premium gap dey track the implied-volatility gap, not the ticker identity. Buyer of TSLA call need far larger move just to break even, and the seller collect far larger cushion for same eleven days of risk.

Why share price no be the answer

Natural guess be say pricier stocks dey make pricier options. The data cut the other way. For the spectrum wey dey above, SPY dey trade near $751 per share and e carry the lowest implied volatility of the six, while NVDA dey trade near $195 and e carry one of the highest. The share price set the strike spacing and the dollar size of one contract. E no talk anything about the expected move. Wetin option dey charge for na uncertainty over the life of the contract, and implied volatility na how dem take turn that uncertainty into dollar premium.

The practical takeaway dey for the ranking itself. When one option look expensive next to another one, compare their implied volatilities before anything else. High number tell you say the market expect big move and e dey charge accordingly. E mark option wey dem price for turbulence, not mistake for the quote. Low number tell you say the market expect calm. The option greeks all flow from the same input, and how the greeks dey change with time show the premium dey re-price session by session as that expected move dey shift.

FAQ

Why two similar options dey get price wey different so?

The answer na implied volatility, market own priced-in estimate of the stock expected move. Two options with same expiration and moneyness for different stocks dey carry different premiums anytime the market expect say one stock go move pass the other one. The one wey dey for the more volatile name go cost more.

Wetin be implied volatility for one sentence?

Na the annualized move wey the market dey currently price into option, dem back am out from that option market price with pricing model. Higher reading mean bigger expected swing and larger premium.

Higher stock price dey make option cost more?

No. Share price set the dollar size of contract and the spacing between strikes, not the premium as share of the stock. For the snapshot wey dey above, highest-priced name carry lowest implied volatility, and lower-priced name carry one of the highest.

High-implied-volatility option na bad buy?

Not on im own. High reading mean say the market expect large move and e dey charge for am. The buyer then need bigger move to profit, and the seller collect bigger premium. E describe the price of the expected move, never whether the trade go work out.

How dem dey calculate implied volatility?

Pricing model dey take the option market price, the stock price, the strike, the time to expiry, and the interest rate, then e dey solve for the one volatility figure wey go reproduce the price wey dem observe. Our tape dey recompute am for every listed contract each session.

Run this same spectrum for any set of tickers for the Strasmore terminal and watch where each name go land.