Seasonality
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Monthly Returns Heatmap
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | -1.91% | -17.83% | -18.35% | -8.19% | -16.14% | -11.65% | 9.49% | 10.91% | ||||
| 2025 | 14.60% | 1.40% | -2.80% | 1.97% | 2.32% | 2.04% | -2.32% | 0.55% | -7.46% | 3.17% | 0.85% | -6.13% |
| 2024 | 9.43% | 4.66% | 3.44% | 4.93% | 5.15% | 1.91% | -4.06% | 10.71% | 2.46% | 0.26% | 7.90% | -1.48% |
| 2023 | -0.04% | 1.02% | 7.08% | 4.18% | -1.23% | 5.07% | -4.14% | 4.03% | -2.11% | -3.05% | 9.18% | 3.44% |
| 2022 | 0.99% | 2.96% | 0.27% | -4.92% | -2.61% | -9.12% | 10.14% | -1.80% | -3.92% | 11.31% | 5.01% | 2.21% |
| 2021 | -1.42% | 9.42% | -0.34% | 12.81% | -2.41% | 0.49% | 6.64% | -0.99% | -3.90% | -0.60% | -11.73% | 11.58% |
| 2020 | -10.70% | -12.73% | 14.86% | 1.36% | -7.58% | 9.85% | 6.35% | -6.85% | -10.31% | -3.27% | 8.45% | |
| Avg | 3.61% | -1.30% | -3.35% | 3.66% | -1.94% | -2.69% | 3.66% | 3.14% | -3.63% | 0.13% | 1.32% | 3.01% |
Apr is the seasonally strongest month over 5Y.
Apr averages +3.7% with a 71% win rate across 5 years of history.
Sep shows persistent seasonal weakness.
Sep averages -3.6% with only a 17% win rate across 5 years of history.
Q4 (Oct–Nov–Dec) is the seasonally strongest quarter.
The three months of Q4 combine for a +4.5% average return historically.
Q1 historically shows a slow seasonal start.
Q1 (Jan–Mar) averages -1.0% historically, with January alone posting a 50% win rate.
2026 YTD is tracking below the 5Y seasonal average.
At day 155 of the year, the current YTD return is -59.3% vs the historical average for the same point.
BSX - Average returns for the respective month in the last 5 years
BSX - Average growth of $100 invested at start of year
5 years of data
BSX Distribution of Daily Returns from 2021 to 2026
BSX Distribution of Daily % Changes