Method and sources
Methodology: Noble Growth interpretation of Mark Spitznagel's two-factor “Siegfried” screen. Filing inputs: SEC company facts, latest fiscal year available. Universe: top 50 unique S&P 500 issuers by SPY weight on September 1 2026; Alphabet share classes consolidated. Banks and financial conglomerates are retained but unscored because the book excludes them. Educational analysis, not investment advice.
Values are published in /index/data.js. Curated series are updated by hand when the source publishes.
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