The Thesis
Donchian-breakout is a textbook trend-following system applied to a curated 24-stock large-cap universe spanning tech, financials, healthcare, consumer, and energy. The rules are deliberately simple: buy when a name punches through its 20-day high, exit when it falls to its 20-day low. No fundamental filtering, no sentiment overlay — pure price structure.
The appeal is its clarity. Trend-following has a long academic pedigree, and the Donchian channel is one of its most battle-tested implementations. Applied to liquid blue chips rather than futures, the strategy trades execution ease for the volatility and mean-reversion tendencies that make equities a harder medium for this approach.
Backtest Snapshot
Over 451 days and 108 trades, the strategy returned 6.95% on a starting $10,000 notional (CAGR: 3.83%). That's a survivable number but not a compelling one, and the other metrics add important colour:
| Metric | Value |
|---|---|
| Sharpe ratio | 0.34 |
| Max drawdown | 21.73% |
| Win rate | 38.46% |
| Turnover | 2,083% |
A 0.34 Sharpe with a 21.7% drawdown is a rough ratio — you're accepting significant pain for pedestrian returns. The low win rate (38%) is expected for trend-following, where the model is designed to lose often but win large; whether that payload materialises depends heavily on the market regime.
Cross-Validation: A Tale of Two Regimes
Four-fold walk-forward validation paints a more nuanced picture than the headline numbers suggest:
- Fold 1 (Aug 2024 – Jan 2025): +0.73%, Sharpe 0.21 — essentially flat
- Fold 2 (Jan – Jul 2025): −7.46%, Sharpe −1.07 — the strategy's worst period
- Fold 3 (Jul – Dec 2025): +14.09%, Sharpe 2.72 — a strong trending environment
- Fold 4 (Dec 2025 – May 2026): +11.35%, Sharpe 1.86 — sustained outperformance
Three of four folds were positive, and the most recent out-of-sample (OOS) period returned 11.35% with a Sharpe of 1.86 — a genuinely encouraging signal. The strategy appears to have found its footing once the market entered a more directional phase in the second half of 2025.
The formal validation gate was not passed, however. The Probabilistic Sharpe Ratio sits at 0.674 and the Deflated Sharpe Ratio at just 0.198 — the latter penalising the 6 trials run to tune this version. These metrics flag that the full-period Sharpe is not yet statistically robust enough to rule out luck, and that repeated testing erodes confidence further.
Live Activity: Waiting for Signal
The strategy's last executed trades were in early-to-mid June: buys in KO, UNH, CAT, ABBV, AAPL, and MSFT; a sell in CAT and MSFT. Since then — June 23 through June 30 — every daily run has logged zero executions and between one and three rejections. Cash on hand is $1,760.89 against a total portfolio of roughly $9,500–$9,700.
This is the strategy doing exactly what it's supposed to: holding fire when breakout conditions aren't met. It's not a warning sign in isolation, but a week of no signals in a 24-name universe does suggest range-bound or indecisive price action across the watchlist.
Strengths and Risks
Strengths: Rules-based, auditable, low operational complexity. Strong OOS performance in folds 3 and 4. Regime-sensitive by design — performs well when trends persist.
Risks: High drawdown relative to return. Below-threshold DSR means the edge hasn't been proven at a statistical level yet. Win rate below 40% demands strict discipline to avoid premature exits. The strategy will suffer in whipsaw markets, as fold 2 demonstrated clearly.
Donchian-breakout is a work in progress with real promise in its recent folds, but it hasn't yet earned a production allocation on the numbers alone. More live data — and ideally a continued trending environment — will be the judge.