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Seasonality Analysis

20.26 0.03 (0.15%) 09/04/2026
State Street Corporation (STT-PG)
Showing 2 years of seasonality data. To view all years, Upgrade to PRO plan!
Historical Prices Year-by-Year


Historical Returns (%) By Years/Months
YearJanFebMarAprMayJunJulAugSepOctNovDecMinMaxavg
20264.39-1.88-4.562.96-1.58-0.33-1.32-2.73-0.15   -4.564.39-0.58
2025 0.33-4.33-1.850.69-1.033.782.062.63-1.56-2.231.76-4.333.780.02
Summary
Avg Returns (%)4.39-0.78-4.450.56-0.45-0.681.23-0.341.24-1.56-2.231.76-4.454.39-0.11
Max Pos Return (%)4.390.33-4.332.960.69-0.333.782.062.63-1.56-2.231.76-4.334.390.85
Max Neg Return (%)4.39-1.88-4.56-1.85-1.58-1.03-1.32-2.73-0.15-1.56-2.231.76-4.564.39-1.06
Pos Occurances (%)1005005050050505000100010042
Neg Occurance (%)05010050501005050501001000010058
Advanced Seasonality
STT-PG · 7 seasons · Jan 2020 – Sep 2026 · 1,678 sessions · split-adjusted closes
Next 1 month · Oct-0.64%50% positive · 6 seasons
Next 3 months · Oct–Dec-1.48%33% positive · 6 seasons
Next 6 months · Oct–Mar+0.53%50% positive · 6 seasons
Strongest monthJulmedian +1.38% · 86% hit
Weakest monthFebmedian -1.88% · 29% hit
Split-half stability0.04mixed · 6/12 months agree
Sep month-to-date-0.15%seasonal median +0.43%
Key takeaways
  • Seasonality here is suggestive, not decisive: split-half rank correlation of 0.04 across the twelve months, with 6 of 12 months keeping the same sign in both halves.
  • Jul is the strongest month (edge 58/100, Moderate): median +1.38%, mean +2.89%, higher in 6 of 7 years (86%), t = 2.18, p = 0.072.
  • Feb is the weakest month (edge 56/100, Moderate): median -1.88%, mean -1.66%, lower in 5 of 7 years, t = -2.48, p = 0.048.
  • Best stretch of the year is Jul–Nov: median +4.79% compounded, positive in 5 of 6 seasons (83%), p = 0.174.
  • Worst stretch is Feb–Jun: median -5.86% compounded, positive in only 2 of 7 seasons (29%).
  • We are in Sep, historically a +0.43% median month with a 50% hit rate. Month-to-date STT-PG is -0.15% — behind the seasonal norm.
  • Seasonal path from here: Oct -0.64% (50% hit), Oct–Dec -1.48% (33%), Oct–Mar +0.53% (50%) — medians of the compounded window return.
  • The median seasonal year peaks around Sep at +5.78%, troughs around Jun at -1.06% and finishes the year at +3.32% (5 complete years).
  • Best weekday is Tuesday at +0.054% a session (not significant); weakest is Monday at -0.062%.
  • Turn-of-month (last 3 sessions plus first 3) averages -0.007% a session against +0.012% for the rest of the month — a -0.019% daily spread across 483 sessions.
  • By quarter, Q3 is the best (median +3.31%, 67% positive) and Q4 the worst (median -1.48%).
  • Risk is seasonal too: Mar is the most volatile month (22.7% annualised) and Jul the calmest (8.1%); participation peaks in Mar at +44% of the average month's volume.
  • Twelve months were tested at once, so the 5% bar is really 0.0042 after a Bonferroni correction — no month clears it. With 7 seasons of data, seasonality is context, not a trade on its own.
Seasonal compositethe shape of a typical year, trading day by trading day
Each complete year is re-based to the prior year’s closing price and stacked on a common trading-day axis. The line is the median year across 5 seasons (2021–2025); the shaded band is the inter-quartile range, so half of all seasons lived inside it. The mean path is available in the legend but is the wrong statistic for a single stock — one outlier year owns it.
Monthly significance tests, seasonal windows, calendar effects, cycle and volatility seasonality are part of the paid plan. Upgrade to PRO plan!

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