What is the current SPGI expected move?

As of Sep 30, 2026, S&P Global Inc. (SPGI) has an expected move of 8.72% over the next 30 days, implying a one-standard-deviation price range of $362.09 to $431.23 from the current $396.66. The expected move is derived from at-the-money straddle pricing and represents the market consensus for a ±1σ price move.

What does the SPGI expected move mean for traders?

Roughly 68% of outcomes should fall within ±1 expected move and 95% within ±2 under lognormal assumptions, though equity returns have empirically fatter tails than log-normal predicts. Strategies sized to the expected move (iron condors at ±1σ, strangles at ±1.5σ) target the typical outcome distribution; strategies that profit from tail moves (long-vol structures, ratio backspreads) target the tails the lognormal model under-prices.

How is SPGI expected move calculated?

The expected move displayed here is derived from at-the-money implied volatility scaled to the chosen tenor: expected move % is approximately ATM IV times sqrt(T / 365), where T is days to expiration. An equivalent straddle-based form: the ATM straddle (call + put at the same strike) is roughly sqrt(2/pi) times spot times IV times sqrt(T/365), so the implied one-standard-deviation move is approximately 1.25 times ATM straddle divided by spot. The two formulations agree once the sqrt(2/pi) constant is reconciled.

S&P Global Inc. (SPGI) Expected Move

Expected move estimates the probable price range for a given period based on at-the-money options pricing. It reflects the market consensus for volatility over the selected timeframe.

S&P Global Inc. (SPGI) operates in the Financial Services sector, specifically the Financial - Data & Stock Exchanges industry, with a market capitalization near $116.29B, listed on NYSE, employing roughly 44,500 people, carrying a beta of 1.08 to the broader market. S&P Global Inc. Led by Martina L. Cheung, public since 1973-02-21.

Snapshot as of Sep 30, 2026.

Spot Price: $396.66
Expected Move: 8.7%
Implied High: $431.23
Implied Low: $362.09
Front DTE: 30 days

As of Sep 30, 2026, S&P Global Inc. (SPGI) has an expected move of 8.72%, a one-standard-deviation implied price range of roughly $362.09 to $431.23 from the current $396.66. Expected move is derived from at-the-money straddle pricing and represents the market's pricing of a ±1σ move. Roughly 68% of outcomes should fall within this range under lognormal assumptions, though empirical markets have fatter tails.

SPGI Strategy Sizing to the Expected Move

With S&P Global Inc. pricing an expected move of 8.72% from $396.66, risk-defined strategies sized to the implied range structurally target the modal outcome distribution. Iron condors with wings at the ±1σ expected move boundaries collect premium against the ~68% probability that spot stays inside the range under lognormal assumptions; strangles set wider at ±1.5σ or ±2σ target the tails but pay smaller per-trade premium. Long-vol structures (long straddles, ratio backspreads) profit when realized move exceeds the implied move, the inverse trade: they bet against the lognormal assumption itself, capitalizing on the empirically fatter equity-return tails.

How to read the SPGI implied-range chart

The shaded range above shows the one-standard-deviation implied price band at each listed expiration, derived from ATM implied volatility scaled to days-to-expiration. The front-tenor expected move is 8.72%, anchoring an implied range of approximately $362.09 to $431.23. Under lognormal assumptions, roughly 68% of outcomes fall inside that band; 95% fall inside ±2σ; 99.7% inside ±3σ. The empirical equity-return distribution has fatter tails than lognormal, so true tail-outcome frequency is moderately higher than these closed-form numbers suggest.

SPGI expected move and event pricing

Expected move widens with √time: a 5% 30-day move corresponds to roughly a 2.5% 7.5-day move and a 10% 120-day move. SPGI term-structure is in backwardation (slope -0.001), so near-dated tenors price in disproportionate vol - usually because of a known event in the front-month window.

Sizing SPGI structures to the expected move

Iron condors with wings at ±1σ collect the modal-outcome premium; ±1.5σ widens probability of inside-range to ~87% but cuts collected premium roughly in half. Strangles do the inverse trade - they pay against the same lognormal distribution, profiting when realized exceeds implied. Calendar spreads bet on the slope of the term structure rather than the level. SPGI put/call volume ratio currently at 2.23 indicates protective put flow dominates - look for hedged-money positioning into the move. The expected move is the inputs the chain is pricing, not a forecast - realized moves above or below are normal under any distribution.

Learn how expected move is reported and how to read the data →

Shaded band shows the ±1σ implied price range (~68% probability under lognormal assumptions) at each expiration; the center line marks current spot. Bands widen with longer DTE since volatility scales with √time.

Per-expiration expected move for SPGI derived from ATM implied volatility at each listed expiration. Implied high/low bounds are computed as $396.66 × (1 ± expected move %). One standard-deviation range under lognormal assumptions, roughly 68% of outcomes fall inside.

Expiration	DTE	ATM IV	Expected Move	Implied High	Implied Low
Oct 2, 2026	2	30.0%	2.2%	$405.47	$387.85
Oct 9, 2026	9	28.6%	4.5%	$414.47	$378.85
Oct 16, 2026	16	24.8%	5.2%	$417.26	$376.06
Oct 23, 2026	23	25.9%	6.5%	$422.45	$370.87
Oct 30, 2026	30	30.4%	8.7%	$431.23	$362.09
Nov 6, 2026	37	30.3%	9.6%	$434.93	$358.39
Nov 20, 2026	51	28.4%	10.6%	$438.77	$354.55
Dec 18, 2026	79	28.1%	13.1%	$448.51	$344.81
Jan 15, 2027	107	27.4%	14.8%	$455.51	$337.81
Feb 19, 2027	142	28.8%	18.0%	$467.91	$325.41
Mar 19, 2027	170	28.9%	19.7%	$474.89	$318.43
May 21, 2027	233	29.8%	23.8%	$491.10	$302.22
Jun 17, 2027	260	29.7%	25.1%	$496.09	$297.23
Sep 17, 2027	352	29.9%	29.4%	$513.13	$280.19
Dec 17, 2027	443	30.1%	33.2%	$528.19	$265.13
Jan 21, 2028	478	30.2%	34.6%	$533.75	$259.57
Jan 19, 2029	842	31.0%	47.1%	$583.42	$209.90

Frequently asked SPGI expected move questions

What is the current SPGI expected move?: As of Sep 30, 2026, S&P Global Inc. (SPGI) has an expected move of 8.72% over the next 30 days, implying a one-standard-deviation price range of $362.09 to $431.23 from the current $396.66. The expected move is derived from at-the-money straddle pricing and represents the market consensus for a ±1σ price move.
What does the SPGI expected move mean for traders?: Roughly 68% of outcomes should fall within ±1 expected move and 95% within ±2 under lognormal assumptions, though equity returns have empirically fatter tails than log-normal predicts. Strategies sized to the expected move (iron condors at ±1σ, strangles at ±1.5σ) target the typical outcome distribution; strategies that profit from tail moves (long-vol structures, ratio backspreads) target the tails the lognormal model under-prices.
How is SPGI expected move calculated?: The expected move displayed here is derived from at-the-money implied volatility scaled to the chosen tenor: expected move % is approximately ATM IV times sqrt(T / 365), where T is days to expiration. An equivalent straddle-based form: the ATM straddle (call + put at the same strike) is roughly sqrt(2/pi) times spot times IV times sqrt(T/365), so the implied one-standard-deviation move is approximately 1.25 times ATM straddle divided by spot. The two formulations agree once the sqrt(2/pi) constant is reconciled.