StockArithm runs sector ETF signals in public so you can see what's actually working — not what backtested well.
For people who do not have time to do quant research themselves, StockArithm tests traditional and alternative-data signals on sector ETFs and keeps the results public.
Each signal is a rule-based idea that tries to decide when a sector or market trade should outperform SPY. Some signals use standard momentum logic. Others use alternative data like TSA checkpoint traffic, freight activity, electricity demand, and search behavior.
The board shows which signals are actually holding up in public paper trading, not just which ones looked good in a backtest.
Need the terms in plain English? Start with the glossary.
StockArithm takes two broad kinds of signal ideas — traditional ETF rotation signals and alternative-data signals — and runs them through the same public test.
Traditional signals use familiar market logic like momentum, relative strength, and rotation. Alternative-data signals use real-world inputs like TSA checkpoint traffic, freight movement, electricity demand, and search behavior to see whether those inputs tell us anything useful about sector performance.
Each signal is paper-traded, ranked against SPY, and kept visible whether it wins or loses. The point is not to publish the prettiest backtest. The point is to show which signals are actually surviving in public, under the same scoreboard, with the losers still on the page.
Most trading signals look good until they have to survive in public. StockArithm exists to show that survival test in real time.
If TSA volume spikes, the lab can turn that into a travel or consumer signal, run it against SPY, and show whether it actually helps.
Recent leaders over the last 30 days.
View the leaderboardPublic counts update nightly. Right now the lab shows 500 total algos, 208 on the watchlist, 5 promoted, and 26 in the graveyard.
Watchlist means worth monitoring but not yet trusted. Promoted means strong enough to feature publicly. Graveyard means the idea failed badly enough that we keep it visible as a dead end.
Read the daily snapshotAll 500 signals in one public list. Names, families, and status only. No rank and no returns.
A lot of the lab is still collecting data, waiting on better history, or sitting in sandbox until the first real trade fires. Families show what each cluster is trying to measure.
A short weekly note on which signals are holding up, which are breaking, and what the lab learned.
Every day we showcase three signals from our lab: two rotating daily picks and one permanent resident. No cherry-picking, no backtested fantasies.
Spotlight 1 & 2 update daily at 6:30pm EST. Never cherry-picked: rotation is deterministic with 14-day anti-repeat.
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This service publishes experimental signals, research outputs, and historical observations. These are not recommendations to buy, sell, or hold any asset.
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