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Spire Inc SR 79.23 -1.11 -1.38%

Previous-day view · Fri Sep 18 close. You are previewing the previous trading day. Subscribe to see today live and every other date — plans start at Delta, $39/mo. Sign up Sign in
Group
Window
Scale
Plotted 3/8
Metric library

Volatility

Interactive timeline

SR / Comparative study

3 signals / 503 sessions
Window statistics

Signal snapshot

Current value vs. selected history
IV Rank z 0.17
24.34
Mean
21.48
Window
+120.3%
ATM IV z -0.50
0.27
Mean
0.37
Window
-0.4%
IV Percentile z 0.54
62.15
Mean
46.37
Window
+117.5%
Relationship matrix

Correlation

Pearson r
Signal IV Rank ATM IV IV Percent...
IV Rank 1.00 0.95 0.87
ATM IV 0.95 1.00 0.84
IV Percent... 0.87 0.84 1.00
Source observations

Data inspector

1-50 of 503
  • 1 / 11
Date Close IV Rank ATM IV IV Percentile
2026-09-18 79.23 24.34 0.27 62.15
2026-09-17 80.34 19.7 0.23 45.02
2026-09-16 79.9 20.9 0.24 49.8
2026-09-15 80.22 18.75 0.22 39.44
2026-09-14 81.36 12.09 0.17 8.4
2026-09-11 80.2 47.18 0.45 91.63
2026-09-10 81.47 40.27 0.39 84.46
2026-09-09 81.62 39.96 0.39 84.06
2026-09-08 83.44 26.23 0.28 64.94
2026-09-07 82.68 31.94 0.33 80
2026-09-04 82.68 30.47 0.32 77.29
2026-09-03 83.33 9.37 0.15 2.39
2026-09-02 82.77 29.13 0.31 72.51
2026-09-01 82.78 28.65 0.3 71.2
2026-08-31 81.84 22.16 0.25 53.82
2026-08-28 82.56 21.3 0.24 50.4
2026-08-27 82.54 20.07 0.24 46.8
2026-08-26 83.66 12.71 0.18 11.6
2026-08-25 83.21 18.77 0.23 40.8
2026-08-24 82.37 19.04 0.23 41.77
2026-08-21 80.92 24.42 0.27 61.2
2026-08-20 83.3 26.75 0.29 66.4
2026-08-19 83.52 17.85 0.22 37.2
2026-08-18 83.13 20.16 0.24 48.4
2026-08-17 82.29 26.35 0.28 65.86
2026-08-14 82.84 25.18 0.28 63.6
2026-08-13 82.93 15.74 0.2 27.2
2026-08-12 82.71 22.75 0.26 57.2
2026-08-11 82.45 14.06 0.19 19.6
2026-08-10 81.04 17.52 0.22 34.94
2026-08-07 81.97 14.98 0.2 22.4
2026-08-06 80.84 19.85 0.23 48
2026-08-05 80.78 13.27 0.18 14.4
2026-08-04 79.56 22.87 0.26 57.2
2026-08-03 80.09 22.18 0.25 55.42
2026-07-31 79.86 21.43 0.25 53.2
2026-07-30 80.53 17.56 0.22 36.8
2026-07-29 81.01 31.85 0.33 78
2026-07-28 82.55 19.43 0.23 46
2026-07-27 82.44 18.31 0.22 40.56
2026-07-24 83.28 20.67 0.24 49.6
2026-07-23 82.5 25.42 0.28 61.6
2026-07-22 82.08 19.24 0.23 44.4
2026-07-21 80.59 18.41 0.22 40.4
2026-07-20 81.19 11.61 0.17 6.43
2026-07-17 81.41 15.86 0.2 27.2
2026-07-16 81.95 9.73 0.22 37.2
2026-07-15 80.14 7 0.18 12
2026-07-14 81.39 8.89 0.21 30.4
2026-07-13 82.42 38.69 0.63 95.18