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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 DXCM?

“Sell in May and go away” does not beat buy-and-hold on DXCM: -4.3 points a year over 21 years.

Total return
×14
Buy and hold
×31
CAGR
13.2%
Sharpe
0.51
Max drawdown
-82.8%
Trades
43
Out of sample
—
Years
21
1×10×55×20062008201020122014201620182020202220242026
StrategyDXCM

Findings

  1. “Sell in May and go away” does not beat buy-and-hold on DXCM: -4.3 points a year over 21 years.
  2. Against the S&P 500 over the same window: +1.9 points a year.
  3. Total return ×14 versus ×31 for buy-and-hold, with 43 trades.
  4. Maximum drawdown -82.8%.
  5. It beats in neither half of the history (split at 2015).
  6. It ranks #46 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 DXCM 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 DXCM → · Full page for “Sell in May and go away” →

How to cite

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

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