Weekly Commentary: September 27, 2026
⚠️ Not financial advice. This is auto-generated each week by Anthropic's Claude (an AI model). Brian Beals is not a registered investment advisor, and Anthropic's Claude is not licensed to provide personalized financial advice. The screener is a research and methodology demo, not a recommendation system. Past performance does not predict future results. Do your own research before making any investment decisions.
By Brian Beals. Methodology and code: github.com/brianbeals/sector-rotation-screener. Commentary generated by Anthropic's Claude (claude-opus-4-8).
What the screen said this week
The screen classifies the current environment as mid-cycle. That call comes from industrial production (INDPRO) growing at +1.4% year over year, which sits inside the 0.0% to 4.0% band the rule set treats as steady expansion, combined with a positive yield curve reading of +0.31 (longer-term rates above shorter-term rates). Together the rule set reads these as consistent with an economy that is expanding at a measured pace.
Technology (XLK) topped the composite at 80.1, the only sector clearing the Buy threshold of 65. Its score is driven by a maximum cycle fit of 100 and strong relative strength of 78.5 (relative strength, or RS, measures how a sector is performing against peers), with seasonality contributing a middling 50.6. Communications (XLC) came second at 63.2 and carries a Watch flag: the rule set favors it on cycle fit (100) but its RS of 42.6 sits below the 45 line the screen requires before a Watch can become a Buy. Everything below Energy (Hold, 42.4) landed in Avoid territory at or under 40, including Industrials, Healthcare, Financials, and the more defensive Staples, Utilities, and Real Estate names.
Things worth noticing
Energy stands out as a divergence between price action and composite score. Its three-month relative strength (rs3m) is the strongest in the table at +9.84%, yet its composite is only 42.4 because cycle fit (50) and the RS score (31.7) drag it down. The rs3m figure and the RS composite input capture different windows, so a sector can look strong on recent momentum while still scoring modestly on the blended measure.
The Communications seasonality reading is marked "thin sample" at 33.0, meaning fewer historical observations feed that number, so it deserves less weight than a well-populated figure. Also worth noting: several defensive sectors (Staples, Utilities, Real Estate) show sharply negative rs3m, which lines up with the mid-cycle, cycle-favored tilt toward Technology rather than defensives.
Finally, over the backtest window since May 2011, the strategy returned +646.90% versus SPY at +654.00%, so it did not beat a plain SPY hold net of 1 bps trading cost. Buy-signal excess return was a slim +0.03%.
Methodology reminder
The composite is the weighted sum named above: seasonality 25%, cycle fit 40%, and relative strength 35%. Lookahead bias is controlled by using FRED ALFRED point-in-time data vintages in the backtest, so the screen only "sees" data that was available at each historical date. The backtest result is a property of this specific rule set, not a forecast of anything.