Does anything beat buy & hold on Genuine Parts Company (GPC)?
Every setup we tested on Genuine Parts Company (GPC) — ranked out-of-sample, corrected for multiple testing, and forward-tracked in public from the day this page published. The honest answer is the headline.
No setup beat simply holding once tested honestly. We say so plainly.
Its best setup only beat buy-and-hold in one window — a regime artifact, not a strategy. Buy-and-hold benchmark: +10.8% CAGR over 46.7 years (+8.5% CAGR in the out-of-sample window).
Educational research from historical backtests — not investment advice. Past performance does not predict future results.
GPC: we tested 750 setups and none beat simply holding Genuine Parts Company
For Genuine Parts Company (GPC), we ran 750 indicator configurations against a plain buy-and-hold benchmark, and none of them earned the right to replace it. Individual stocks carry idiosyncratic risk — earnings surprises, guidance changes, sector rotation — that indicators built on price history cannot see coming. The best-looking setup, Demand Index on the weekly timeframe, ranked at the top in-sample but delivered an out-of-sample Sharpe of 0.65, short of our hurdle of 0.97. Buy-and-hold returned +10.8% annualized over the test period; the top strategies mostly captured pieces of that same move while adding trading friction.
How to read this honestly: when you test 750 setups and keep the best one, something will always look impressive by chance alone. That is why we require the survivor to clear 0.97 out of sample. Demand Index managed 0.65, with out-of-sample alpha of +2.7% across 14.0 years and 125 trades, and only 0.1% of everything we tested beat the benchmark on unseen data — roughly what luck would produce. None of this predicts anything: the regime that generated these numbers can shift, and single stocks shift faster than most. Treat this page as a record of what failed under honest testing, not a forecast.
Every figure above is computed from our own backtests — nothing is estimated or invented. Hypothetical results; not investment advice.
The least-bad setups — shown with their failure numbers
Nothing here earned a verdict — these are the best of a losing field, published so you can see exactly how "best" still failed.
Demand Index
What it is: A volume-confirmation rule: it requires participation to confirm a move before taking exposure. Long/flat only — no leverage, no shorting. The parameters we tested are not published.
How it was tested: signals evaluated at weekly-bar close, the position changes on the NEXT bar, 0.08% cost per side. Same engine, same cost model, same out-of-sample split as every other number on this site.
Out-of-sample (last ~30% of the window, never used to pick this setup): Sharpe 0.65 · alpha +2.7% · 40 trades over 14.0 yrs.
Stochastic Momentum Index
What it is: An oscillator rule: it reads a bounded momentum gauge and takes exposure when it turns from an extreme. Long/flat only — no leverage, no shorting. The parameters we tested are not published.
How it was tested: signals evaluated at weekly-bar close, the position changes on the NEXT bar, 0.08% cost per side. Same engine, same cost model, same out-of-sample split as every other number on this site.
Out-of-sample (last ~30% of the window, never used to pick this setup): Sharpe 0.54 · alpha -1.6% · 13 trades over 14.0 yrs.
Holy Grail Confluence
What it is: An oscillator rule: it reads a bounded momentum gauge and takes exposure when it turns from an extreme. Long/flat only — no leverage, no shorting. The parameters we tested are not published.
How it was tested: signals evaluated at daily-bar close, the position changes on the NEXT bar, 0.08% cost per side. Same engine, same cost model, same out-of-sample split as every other number on this site.
Out-of-sample (last ~30% of the window, never used to pick this setup): Sharpe 0.51 · alpha -1.2% · 26 trades over 14.0 yrs.
Since publication — including if it loses
The setup is ahead so far — over a window this short that is mostly noise. Marked to market nightly from real prices, rules frozen at publication, as of 2026-10-26. Currently LONG.
We tested 750 setups (indicator × parameters × timeframe) on Genuine Parts Company (GPC). Only setups with ≥30 trades qualify (706 did). Setups are ranked by out-of-sample Sharpe — the last ~30% of history, which standard-parameter rules never saw during selection. Because picking the best of 750 tries mines even the holdout, the VALIDATED verdict additionally requires the top setup’s OOS Sharpe to clear a selection hurdle of 0.97 (√(2 ln N)/√T) AND positive alpha in both windows. Of the eligible setups, 0.1% had positive out-of-sample alpha (median OOS Sharpe 0.09) — the table below is truncated, but this summary covers all of them. How we test: methodology. The scoring contract is published in full; the parameters of each individual setup are not.
Top 20 of 706 eligible setups
Ranked by out-of-sample Sharpe. Full + out-of-sample columns, costs included. Hypothetical.
| # | Setup | TF | Total ret | Sharpe | Max DD | Win | Trades | α vs B&H | OOS Sharpe | OOS α | OOS trades |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Demand Index | Weekly | >+999% | 0.63 | -45.7% | 71.2% | 125 | -1.5% | 0.65 | +2.7% | 40 |
| 2 | Stochastic Momentum Index | Weekly | +577.4% | 0.42 | -22.3% | 75.0% | 32 | -6.6% | 0.54 | -1.6% | 13 |
| 3 | Holy Grail Confluence | Daily | >+999% | 0.55 | -44.5% | 82.2% | 73 | -4.0% | 0.51 | -1.2% | 26 |
| 4 | Coppock (fast) | Daily | +603.0% | 0.33 | -43.9% | 41.3% | 409 | -6.6% | 0.49 | -1.1% | 115 |
| 5 | Money Flow Index | Daily | >+999% | 0.42 | -56.4% | 81.0% | 42 | -5.2% | 0.48 | -1.1% | 13 |
| 6 | Ehlers Reflex | Daily | >+999% | 0.52 | -47.6% | 51.4% | 399 | -3.4% | 0.48 | -1.4% | 114 |
| 7 | Connors RSI | Weekly | >+999% | 0.53 | -45.7% | 71.8% | 110 | -4.0% | 0.45 | -2.0% | 36 |
| 8 | Volatility Stop (ATR) | Daily | +152.7% | 0.2 | -66.2% | 42.9% | 340 | -8.9% | 0.44 | -1.8% | 92 |
| 9 | Relative Vigor Index | Weekly | +436.7% | 0.3 | -51.3% | 49.3% | 205 | -7.1% | 0.44 | -1.8% | 62 |
| 10 | Zero-Lag LSMA | Weekly | +282.6% | 0.26 | -40.5% | 48.7% | 193 | -7.8% | 0.44 | -2.1% | 54 |
| 11 | Connors RSI-2 | Weekly | >+999% | 0.6 | -45.7% | 73.5% | 113 | -3.1% | 0.44 | -2.4% | 33 |
| 12 | Ehlers Roofing Filter | Weekly | +708.1% | 0.36 | -50.1% | 60.9% | 46 | -6.2% | 0.44 | -2.6% | 13 |
| 13 | FRAMA 10/30 Cross | Weekly | +163.9% | 0.21 | -62.2% | 50.0% | 168 | -8.7% | 0.43 | -2.1% | 47 |
| 14 | Hull MA 15/60 Cross | Daily | +570.6% | 0.33 | -47.1% | 43.5% | 379 | -6.7% | 0.43 | -2.2% | 108 |
| 15 | Ichimoku (fast) | Daily | +150.4% | 0.2 | -56.3% | 44.9% | 561 | -8.9% | 0.43 | -2.3% | 154 |
| 16 | SMC: Liquidity Sweep | Weekly | >+999% | 0.46 | -47.4% | 88.2% | 34 | -4.4% | 0.42 | -1.8% | 12 |
| 17 | Ultimate Oscillator | Daily | +249.2% | 0.25 | -44.1% | 74.2% | 31 | -8.1% | 0.42 | -2.0% | 14 |
| 18 | SMC: Liquidity Sweep | Daily | >+999% | 0.53 | -50.9% | 76.0% | 179 | -2.7% | 0.42 | -2.1% | 52 |
| 19 | Williams %R | Weekly | >+999% | 0.56 | -44.1% | 83.3% | 66 | -3.2% | 0.42 | -2.4% | 19 |
| 20 | MA Envelope | Weekly | >+999% | 0.48 | -43.1% | 70.0% | 90 | -4.7% | 0.42 | -2.5% | 31 |
Hypothetical backtests with 0.08%/side costs. Not investment advice — see the full disclaimer.
These are historical backtests of mechanical rules. They are educational research, not investment advice, not a recommendation, and not tailored to you. Educational information only — not investment advice. Hypothetical backtested results; past performance does not guarantee future results. Trading involves risk of loss.