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Seasonality Analysis

3.80 -0.06 (-1.55%) 09/04/2026
NIO Inc. (NIO)
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
2026-7.843.6223.825.97-12.36-9.64-3.56-13.32-10.17   -13.3223.82-2.61
2025 7.18-17.716.30-12.59-3.1141.9831.0119.44-4.86-24.14-7.27-24.1441.983.29
Summary
Avg Returns (%)-7.845.403.066.14-12.48-6.3819.218.854.64-4.86-24.14-7.27-24.1419.21-1.31
Max Pos Return (%)-7.847.1823.826.30-12.36-3.1141.9831.0119.44-4.86-24.14-7.27-24.1441.985.85
Max Neg Return (%)-7.843.62-17.715.97-12.59-9.64-3.56-13.32-10.17-4.86-24.14-7.27-24.145.97-8.46
Pos Occurances (%)01005010000505050000010033
Neg Occurance (%)1000500100100505050100100100010067
Advanced Seasonality
NIO · 7 seasons · Jan 2020 – Sep 2026 · 1,678 sessions · split-adjusted closes
Next 1 month · Oct-12.05%33% positive · 6 seasons
Next 3 months · Oct–Dec-22.08%33% positive · 6 seasons
Next 6 months · Oct–Mar-37.14%17% positive · 6 seasons
Strongest monthAprmedian +4.89% · 71% hit
Weakest monthMarmedian -14.85% · 29% hit
Split-half stability-0.66unstable · 4/12 months agree
Sep month-to-date-10.17%seasonal median +1.07%
Key takeaways
  • Treat this calendar as weak evidence. The first half of the sample and the second half rank-correlate -0.66 across the twelve months — the pattern that held early did not hold late, which is what noise looks like.
  • Apr is the strongest month (edge 40/100, Weak): median +4.89%, mean -0.54%, higher in 5 of 7 years (71%), t = -0.09, p = 0.935.
  • Mar is the weakest month (edge 40/100, Weak): median -14.85%, mean -8.44%, lower in 5 of 7 years, t = -1.13, p = 0.302.
  • Best stretch of the year is May–Sep: median +28.20% compounded, positive in 4 of 6 seasons (67%), p = 0.254.
  • Worst stretch is Oct–Mar: median -37.14% compounded, positive in only 1 of 6 seasons (17%).
  • We are in Sep, historically a +1.07% median month with a 50% hit rate. Month-to-date NIO is -10.17% — behind the seasonal norm.
  • Seasonal path from here: Oct -12.05% (33% hit), Oct–Dec -22.08% (33%), Oct–Mar -37.14% (17%) — medians of the compounded window return.
  • The median seasonal year peaks around Jan at +6.19%, troughs around Dec at -51.71% and finishes the year at -51.71% (5 complete years).
  • Best weekday is Monday at +0.848% a session (significant, p = 0.003); weakest is Friday at -0.430%.
  • Turn-of-month (last 3 sessions plus first 3) averages +0.356% a session against +0.019% for the rest of the month — a +0.337% daily spread across 483 sessions.
  • By quarter, Q3 is the best (median +26.93%, 50% positive) and Q4 the worst (median -22.08%).
  • Risk is seasonal too: Mar is the most volatile month (90.4% annualised) and Aug the calmest (63.6%); participation peaks in Mar at +16% 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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