SEI Investments Company (SEIC) Seasonality
Recurring seasonal patterns for SEIC — the calendar windows where SEI Investments Company has historically tended to rise or fall, with the win rate (how often it repeated) and average return for each, based on the last 10 years of price history.
SEIC seasonality at a glance
Over the last 10 years, SEIC's strongest seasonal window has been Oct 31 – Nov 10: it ended higher in 10 of 10 years (100% win rate) with an average return of +4.86% across a 10-day hold. On the weak side, SEIC has historically declined between Jul 25 – Aug 4, falling in 9 of 10 years (average -2.36%).
In total, our analysis finds 614 recurring seasonal windows for SEI Investments Company — 393 bullish and 221 bearish. The next high-win-rate window, Oct 11 – Nov 10, opens in 30 days. These figures describe historical behaviour only — not a forecast.
SEIC's upcoming & recent seasonal patterns
Holding period:10-day20-day30-dayOrdered by season — windows opening soon first, plus a couple of recently completed high-performers. Holding-period colors help you compare durations at a glance.
| Status | Seasonal window | Hold | Avg return | Win rate | This year |
|---|---|---|---|---|---|
| Completedended 1d ago | Aug 31 – Sep 10 | 10d | -1.61% | 80% | -3.79% |
| Completedended 2d ago | Aug 30 – Sep 9 | 10d | -1.46% | 80% | -4.00% |
| Upcomingin 30d | Oct 11 – Nov 10 | 30d | +5.61% | 80% | — |
| Upcomingin 32d | Oct 13 – Nov 12 | 30d | +5.69% | 80% | — |
| Upcomingin 35d | Oct 16 – Nov 15 | 30d | +6.01% | 80% | — |
| Upcomingin 36d | Oct 17 – Nov 16 | 30d | +5.94% | 90% | — |
| Upcomingin 37d | Oct 18 – Nov 7 | 20d | +3.31% | 90% | — |
Win rate = how often the pattern repeated in the same direction. Average return = the mean move across all analysed years. Past performance does not guarantee future results.
Explore SEIC seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
SEIC seasonality FAQ
What has historically been the best month to buy SEIC stock?
Based on the last 10 years of price data, SEIC's strongest seasonal window starts in October: Oct 31 to Nov 10, which ended higher in 10 of 10 years (100% win rate) with an average return of +4.86%. Past seasonal patterns do not guarantee future performance.
What is SEIC's strongest seasonal pattern?
SEIC's highest-win-rate pattern in our data is the Oct 31 – Nov 10 window (10-day hold): up in 10 of the last 10 years with an average move of +4.86%.
When has SEIC historically performed worst?
SEIC's weakest recurring window has been Jul 25 to Aug 4, declining in 9 of 10 years with an average return of -2.36%.
How reliable are SEIC's seasonal patterns?
Each SEIC pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. SEIC currently shows 614 recurring windows (393 bullish, 221 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is SEIC stock seasonality?
Seasonality is the tendency of a stock to perform in a similar way during the same period each year. By analysing SEI Investments Company's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where SEIC has repeatedly risen (bullish) or fallen (bearish). Each pattern is scored by its win rate and average return so you can judge how reliable and how strong it has been.
Seasonality is one input among many — it works best alongside your own research and risk management. Learn more in our guide to seasonal analysis and the tutorials.