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Finaxion Research · Bounce off the lower Bollinger band · single stocks · Recomputed 2026-09-10

Does Bounce off the lower Bollinger band work on SJM?

Bounce off the lower Bollinger band does not beat buy-and-hold on SJM: -2.8 points a year over 32 years.

Total return
434.0%
Buy and hold
×12
CAGR
5.4%
Sharpe
0.17
Max drawdown
-27.3%
Trades
284
Out of sample
overfit
Years
32
0.7×1×6.8×12.9×19951998200120042007201020132016201920222025
StrategySJM

Findings

  1. Bounce off the lower Bollinger band does not beat buy-and-hold on SJM: -2.8 points a year over 32 years.
  2. Against the S&P 500 over the same window: -5.7 points a year.
  3. Total return +434.0% versus ×12 for buy-and-hold, with 284 trades.
  4. The result does not hold out of sample: it is overfit.
  5. Maximum drawdown -27.3%.
  6. It beats in neither half of the history (split at 2010).
  7. It ranks #33 of 235 markets for this strategy by annual excess over the S&P 500.

Findings derived from the full panel. Each carries its number and its denominator; the computations are reproducible with artifact 30497848a621.

Exactly what was tested

Close crosses back above the lower band (20, 2σ) after piercing it → entry. Close reaches the 20-day mean → exit.

How to read it

The verdict compares the strategy with buying and holding SJM over the same window, with round-trip costs per asset class. “Out of sample” is walk-forward: the rule is fit on one stretch and judged on the next. A result that beats in the full sample but not out of it is overfit. Full methodology in the protocol. How we test.

Open this backtest with its trades   Trades (CSV)

Every strategy on SJM → · Full page for Bounce off the lower Bollinger band →

How to cite

Finaxion Research (2026). Does Bounce off the lower Bollinger band work on SJM?. Daily backtest 1962-01-01–2026-08-31, artifact 30497848a621. https://finaxion.app/en/research/bollinger-bounce/sjm

Not a recommendation. Past performance does not guarantee future results.