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Finaxion Research · “Sell in May and go away” · single stocks · Recomputed 2026-09-10

Does “Sell in May and go away” work on PSKY?

“Sell in May and go away” beats buy-and-hold on PSKY by +5.1 points a year over 21 years.

Total return
85.3%
Buy and hold
-34.8%
CAGR
3.0%
Sharpe
0.26
Max drawdown
-76.6%
Trades
41
Out of sample
—
Years
21
1×4×20062008201020122014201620182020202220242026
StrategyPSKY

Findings

  1. “Sell in May and go away” beats buy-and-hold on PSKY by +5.1 points a year over 21 years.
  2. Against the S&P 500 over the same window: -8.1 points a year.
  3. Total return +85.3% versus -34.8% for buy-and-hold, with 41 trades.
  4. Maximum drawdown -76.6%.
  5. It beats in both halves of the history (split at 2016).
  6. It ranks #193 of 232 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 0b534dd04389.

Exactly what was tested

Long from the first trading day of November to the last of April; cash from May to October. Calendar rules: simulated with our seasonal engine, same costs as everything else.

How to read it

The verdict compares the strategy with buying and holding PSKY 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 PSKY → · Full page for “Sell in May and go away” →

How to cite

Finaxion Research (2026). Does “Sell in May and go away” work on PSKY?. Daily backtest 1962-01-01–2026-08-31, artifact 0b534dd04389. https://finaxion.app/en/research/sell-in-may/psky

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