Method and sources
Methodology: Noble Growth interpretation of Mark Spitznagel's two-factor “Siegfried” screen. Filing inputs: SEC company facts, latest fiscal year available, with Yahoo Finance filling untagged debt and filers not yet in SEC company facts. Market caps as of September 23 2026. Universe: all 500 unique S&P 500 issuers held by SPY on September 22 2026; multiple share classes consolidated. Banks, insurers and other financials 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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