21/10/2026
How to backtest a stock screener by asking Claude or ChatGPT a question.
Backtest a stock screener by asking Claude or ChatGPT one question. I tested the Magic Formula with and without momentum over 10 years. See the results.
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21/10/2026
How a subscriber turned an interview into a stock screen with AI
A subscriber turned a book interview into a reusable microcap stock screen with AI. See the prompt, the October 2026 results and how to run it yourself.
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19/10/2026
Zombie Companies List 2026: 4 Debt Ratios
The October 2026 zombie companies list: large firms worldwide whose profits cannot cover their debt, ranked by 4 debt ratios in 4 tables.
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19/08/2026
How I run a weekly portfolio review in one prompt, and have it waiting every Monday
Run a weekly portfolio movers review with Claude and the Quant Investing screener. Copy the exact prompts, see the output, schedule it for Monday 9am.
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09/07/2026
16 years of monthly stock ideas. Why that matters for your investing
192 monthly issues since 19 July 2010. See what 16 years of live small-cap value investing earned, what the rules learned, and how to read a sample issue
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02/07/2026
Beste Aktien mit hoher Free-Cash-Flow-Rendite für 2026: 75+ Anlageideen mit Marktschlag-Potenzial
75+ Aktien mit hoher Free-Cash-Flow-Rendite für 2026 — vier Regionen, mit 40 Jahren Backtest-Evidenz und Momentum-Kombination. Sofort umsetzbare Ideen.
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12/06/2026
Nutzen Sie den Piotroski F-Score zur Steigerung Ihrer Anlagerendite um 210,6 %
Der Piotroski F-Score steigerte die Rendite von 13 getesteten Anlagestrategien um durchschnittlich 210,6 % über 12 Jahre. Vollständige Backtest-Daten und Anleitung.
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11/06/2026
Quant Value vs Shareholder Yield: 3-year comparison
We ran 100,000 euros through each newsletter for 3 years. Shareholder Yield made 47%, Quant Value 38%, and owning both gave the best risk-adjusted return.
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11/06/2026
Piotroski F-Score in globalen Aktienmärkten: 10 % Überrendite pro Jahr in 35 Ländern
Studie 2000–2018: Piotroski F-Score liefert 10 % Überrendite p.a. in 20 Industrieländern und 15 Schwellenmärkten. Funktioniert für alle Unternehmensgrößen.
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09/06/2026
Stop Loss Strategies: The Complete Guide for Long-Term Investors
The 5 main stop loss types, what 3 research papers actually show, and how to set systematic exit rules. A guide for long-term investors.
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09/06/2026
Piotroski F-Score Backtest: 23 % jährliche Überrendite über 20 Jahre
Vollständiger Piotroski-F-Score-Backtest: 13,4 % p.a. Überrendite, 23 % bei Long-Short, +210 % bei Kombination mit anderen Strategien. Daten und Tabellen.
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04/06/2026
Piotroski F-Score erklärt: 9 Buchhaltungs-Tests, die Value-Aktien von Value-Fallen trennen
Der Piotroski F-Score erklärt: 9 Bilanztests, die finanzstarke Value-Aktien identifizieren. Mit Backtest-Ergebnissen und praktischer Anleitung.
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03/06/2026
Quant Value Newsletter Maximum Drawdown: 16-Year Analysis
Quant Value newsletter worst peak-to-trough loss over 11.2 years was -20.2% USD and -15.1% EUR. Compare with S&P 500 -25% and STOXX 600 -23%.
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