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RSP options analytics

RSP · ETF

Data as of 23 September 2026 (end of day)

RSP options are pricing a 30-day at-the-money volatility of 12.3%, a move of about ±3.5% over the next month. Its history here is 4 sessions, short of the 180 a percentile needs, so this reading is not yet ranked against its own past.

Its 25-delta puts carry 3.76 volatility points more than the calls.

Longer-dated options carry more: 90-day volatility is 9% above 30-day.

Current readings

30-day ATM implied volatilityⓘ
12.25%

Prices a move of about ±3.5% over 30 days, or ±0.8% on a typical day.

25-delta risk reversalⓘ
+3.76

Puts carry 3.76 volatility points more than calls the same distance from the money.

25-delta butterflyⓘ
+0.43

The wings carry 0.43 volatility points more than at-the-money.

Term structure slopeⓘ
1.087

90-day volatility is 9% above 30-day.

Where 30-day implied volatility sits

Against 2 prior sessions (one-year window)

Not enough history in this window to place the current reading.

IV percentile, 1 year
—
IV rank, 1 year
—
IV percentile, 2 years
—
IV rank, 2 years
—

Rank is the position between the lowest and highest readings in the window, so a single past extreme pins everything after it near one end. Percentile is the share of sessions below the current reading and is unaffected by how far that extreme reached. Both are withheld when the window holds fewer than 180 sessions.

Session detail

Underlying close
$211.31
30-day implied forward
$212.34
60-day ATM IV
13.10%
90-day ATM IV
13.32%
180-day ATM IV
14.11%
Expirations used
5
Total open interest
163,092
Put / call open interest
2.99

The forward is derived from put-call parity on the strikes nearest the money, not taken from the underlying close. It is what every moneyness and delta on this page is measured against.

30-day at-the-money implied volatility

Last 4 sessions

11%12%12%12%12%12%2026-09-22 — 30-day ATM IV 12%2026-09-23 — 30-day ATM IV 12%22 Sep23 Sep
Show the underlying numbers (most recent 4)
Session30-day ATM IV25-delta RRTerm slopeClose
2026-09-2312.25%+3.761.087$211.31
2026-09-2211.54%+3.27—$212.80
2026-09-21———$212.68
2026-09-18———$212.29

The chart covers every session in the archive, 4 in total. The table lists the most recent 4.

25-delta risk reversal

Last 4 sessions

-2.00.02.04.06.02026-09-22 — 25-delta RR (volatility points) 3.32026-09-23 — 25-delta RR (volatility points) 3.822 Sep23 Sep

The dashed line marks zero, where the 25-delta put and call carry the same implied volatility.

Skew curve

Implied volatility by delta, front expirations

Implied volatility by delta

23d (2026-10-16) · 86d (2026-12-18) · 114d (2027-01-15)

5%10%15%20%25%2026-10-16 (23d) — 10Δ C — IV 10.50%2026-10-16 (23d) — 15Δ C — IV 10.38%2026-10-16 (23d) — 20Δ C — IV 10.34%2026-10-16 (23d) — 25Δ C — IV 10.33%2026-10-16 (23d) — 30Δ C — IV 10.33%2026-10-16 (23d) — 35Δ C — IV 10.46%2026-10-16 (23d) — 40Δ C — IV 10.83%2026-10-16 (23d) — 45Δ C — IV 11.29%2026-10-16 (23d) — ATM — IV 11.71%2026-10-16 (23d) — 45Δ P — IV 12.10%2026-10-16 (23d) — 40Δ P — IV 12.51%2026-10-16 (23d) — 35Δ P — IV 12.94%2026-10-16 (23d) — 30Δ P — IV 13.37%2026-10-16 (23d) — 25Δ P — IV 13.94%2026-10-16 (23d) — 20Δ P — IV 15.08%2026-10-16 (23d) — 15Δ P — IV 17.37%2026-10-16 (23d) — 10Δ P — IV 19.53%23d2026-12-18 (86d) — 20Δ C — IV 11.48%2026-12-18 (86d) — 25Δ C — IV 11.74%2026-12-18 (86d) — 30Δ C — IV 12.01%2026-12-18 (86d) — 35Δ C — IV 12.29%2026-12-18 (86d) — 40Δ C — IV 12.62%2026-12-18 (86d) — 45Δ C — IV 12.97%2026-12-18 (86d) — ATM — IV 13.35%2026-12-18 (86d) — 45Δ P — IV 13.78%2026-12-18 (86d) — 40Δ P — IV 14.24%2026-12-18 (86d) — 35Δ P — IV 14.68%2026-12-18 (86d) — 30Δ P — IV 15.15%2026-12-18 (86d) — 25Δ P — IV 15.81%2026-12-18 (86d) — 20Δ P — IV 16.98%2026-12-18 (86d) — 15Δ P — IV 18.96%2026-12-18 (86d) — 10Δ P — IV 21.51%86d2027-01-15 (114d) — 15Δ C — IV 11.55%2027-01-15 (114d) — 20Δ C — IV 11.56%2027-01-15 (114d) — 25Δ C — IV 11.66%2027-01-15 (114d) — 30Δ C — IV 12.01%2027-01-15 (114d) — 35Δ C — IV 12.35%2027-01-15 (114d) — 40Δ C — IV 12.62%2027-01-15 (114d) — 45Δ C — IV 12.89%2027-01-15 (114d) — ATM — IV 13.17%2027-01-15 (114d) — 45Δ P — IV 13.47%2027-01-15 (114d) — 40Δ P — IV 13.83%2027-01-15 (114d) — 35Δ P — IV 14.38%2027-01-15 (114d) — 30Δ P — IV 15.13%2027-01-15 (114d) — 25Δ P — IV 15.98%2027-01-15 (114d) — 20Δ P — IV 17.51%2027-01-15 (114d) — 15Δ P — IV 18.93%2027-01-15 (114d) — 10Δ P — IV 21.34%114d10Δ C25Δ CATM25Δ P10Δ Pout-of-the-money calls ← delta → out-of-the-money puts

The axis is call delta. Readings to the right of the dashed centre line are taken from the out-of-the-money put at that strike, which is the contract whose quote the volatility was solved from. Points are only plotted where surviving quotes bracket the delta on both sides; nothing is extrapolated past the last traded strike.

Show the underlying numbers
Delta23d86d114d
10Δ call10.50%——
15Δ call10.38%—11.55%
20Δ call10.34%11.48%11.56%
25Δ call10.33%11.74%11.66%
30Δ call10.33%12.01%12.01%
35Δ call10.46%12.29%12.35%
40Δ call10.83%12.62%12.62%
45Δ call11.29%12.97%12.89%
ATM11.71%13.35%13.17%
45Δ put12.10%13.78%13.47%
40Δ put12.51%14.24%13.83%
35Δ put12.94%14.68%14.38%
30Δ put13.37%15.15%15.13%
25Δ put13.94%15.81%15.98%
20Δ put15.08%16.98%17.51%
15Δ put17.37%18.96%18.93%
10Δ put19.53%21.51%21.34%

Wing readings by expiration

ExpirationDaysForwardATM IV25Δ put25Δ callRRButterflyQuotes
2026-10-1623$212.1711.71%13.94%10.33%+3.61+0.439
2026-12-1886$213.6413.35%15.81%11.74%+4.07+0.4318
2027-01-15114$213.5313.17%15.98%11.66%+4.31+0.6427
2027-03-19177$215.3614.06%16.84%12.19%+4.65+0.4520
2027-06-17267$217.1714.87%17.70%13.10%+4.59+0.5313

Each curve above is one expiration. The vertical position is implied volatility; the horizontal position is the delta of the contract it was read from. For US equities the curve normally slopes upward to the right, meaning out-of-the-money puts carry higher implied volatility than equidistant calls.

The 25-delta risk reversal summarises that slope as a single number: the 25-delta put volatility minus the 25-delta call volatility. The butterfly summarises the curvature: the average of the two wings minus the at-the-money reading.

Term structure

At-the-money implied volatility by expiration

At-the-money implied volatility by expiration

5 listed expirations produced a usable reading

11%12%13%14%15%16%2026-10-16 — 23 days — at-the-money IV 11.71%2026-12-18 — 86 days — at-the-money IV 13.35%2027-01-15 — 114 days — at-the-money IV 13.17%2027-03-19 — 177 days — at-the-money IV 14.06%2027-06-17 — 267 days — at-the-money IV 14.87%306090180days to expiration

The horizontal axis is the square root of days to expiration, which is the scale volatility lives on. A curve that is flat in variance terms plots as a straight line here rather than bending sharply through the front week.

Show the underlying numbers
ExpirationDaysForwardATM IVATM strikeQuotes used
2026-10-1623 days$212.1711.71%$212.279
2026-12-1886 days$213.6413.35%$214.0918
2027-01-15114 days$213.5313.17%$214.1127
2027-03-19177 days$215.3614.06%$216.3920
2027-06-17267 days$217.1714.87%$218.9313

Constant maturities

Interpolated between the bracketing listed expirations, in total variance

30 days
12.25%
60 days
13.10%
90 days
13.32%
180 days
14.11%

Interpolation is linear in total variance, not in volatility. Interpolating volatility directly implies a forward variance that can be negative between two expirations. A tenor beyond the longest listed expiration is reported as unavailable rather than extrapolated.

Term structure slope

Last 4 sessions

Not enough history to plot.

The dashed line marks 1.00, where the 90-day and 30-day at-the-money volatilities are equal. Above it the longer tenor carries the higher volatility.

The term structure is the at-the-money implied volatility of each listed expiration, plotted against how far away that expiration is. Its usual shape for a calm underlying slopes gently upward, because a longer horizon admits more uncertainty.

It inverts when the market prices a dated event: an expiration that captures a scheduled announcement carries the variance of that event on top of ordinary trading, so a shorter contract can print a higher volatility than a longer one.