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Last engine scanSep 21, 2026, 8:36 AM ET

We publish every trade signal before we know how it ends.

Simple trading rules, tested on ten years of real prices and graded in the open — failures included. Research, not investment advice.

2,388 rules failed our filter — published anyway. Check the ledger →

The Deltalyn engine's flagship strategy buys 55-day breakouts.

One rule, written down: buy when price closes above its highest point of the last 55 trading days, risk a fixed amount, let the trend run. We replayed it on ten years of daily prices across 542 assets — 41 earned an A on their . Every new signal is published before the outcome is known.

  • Best survivorsTradesHit rate
  • AERIE11560.9%+0.483R
  • ADASH8361.5%+0.472R
  • AAPP7360.3%+0.445R
  • AIREN5158.8%+0.355R
  • AGE15057.3%+0.351R

Backtest on daily bars, graded on the pessimistic end of a 95% interval. Past results do not predict future ones — research, not investment advice.

3,252
Rules tested

Simple, written-down trading rules replayed on ten years of daily prices.

864
Survived our filter

Still show an edge when we grade them on their cautious, worst-case number.

2,388
Failed — published anyway

No provable edge. They stay on the board so you can check our work.

The lab: every other strategy under test

Donchian earned the front page; the engine's other strategies keep earning their grades in public. All 3252 rule-and-asset combinations live on the coverage board.

  • Donchian 20 breakout

    Buys when price closes above its highest point of the last 20 trading days — a short-term breakout.

  • Trend Join Long (daily filters)

    The daily part of our stock scanner: a breakout above the prior high, with the daily and weekly trend up and above-average volume.

  • Trend pullback

    Waits for a stock that is already trending up to dip back toward its recent average, then buys the bounce.

  • RSI 60 momentum cross

    Buys when the RSI momentum gauge climbs back above 60 — the move is gaining strength, not just drifting.

  • Stat-arb pairs

    Early research — its own backtest is still negative, and we publish it that way on the evidence page.

Momentum 12-1 · equity curve

Backtest · top quartile vs equal-weight · monthly
+60.1%
benchmark +40.3%
1.14
benchmark 1.13
−52.6%
benchmark −50.0%
Months ahead
53.7%
benchmark of 108 months
Final · Aug 202612-1 momentum 69.03×equal-weight 21.04×
  • 12-1 momentum, top quartile
  • Equal-weight, same universe

Backtest 2017-09 → 2026-08, log scale, month-end drawdown. No costs, no slippage, hindsight-selected universe. Beating the benchmark per unit of risk is the honest test — and the Sharpe gap is small. Not a forecast.

Read all 8 limitations →
Analyst$49/moReal-time alerts from the cloud engines.
  • Real-time alerts: Donchian, Rotation, Stat-Arb, ETH-DCA
  • Risk Gate report on every signal
  • Full access to the public ledger

Cancel anytime · Secure checkout by Stripe · Not investment advice · Research only — no engine places orders.

Deltalyn is a quantitative research terminal for educational and informational purposes. We are not a registered investment adviser, and no signal, backtest, or figure on this site constitutes personalized advice to buy or sell any security. The platform does not execute orders, does not custody funds, and does not manage third-party capital. Historical or simulated ("backtest") performance does not guarantee future results; trade at your own judgment, with your own risk management, and with independent licensed financial advice if you need it.