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The Moat Index Companies A–Z Sectors Berkshire’s Portfolio Moat Movers

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Research As-of Backtest Quality on Sale

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LONGDUODUO COMPANY LIMITEDLDDD Narrow moat

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The Moat Index · Filing-derived evidence, kept in history.

Educational use only

An independent educational research product built around the Moat Index: filing-derived scores, company Track Records, screening, as-of backtests, a rules-only paper portfolio, and portfolio tools. Scores are computed model outputs, not analyst ratings. Nothing here is investment, legal, or tax advice, and we are not affiliated with Warren Buffett or Berkshire Hathaway.

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Data & Tools

The Moat Index All Companies A–Z Sectors Screener Preset Screens Berkshire’s Portfolio Moat Movers Quality on Sale Analyzer Compare Score My Portfolio Paper Moat Portfolio Watchlist

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Research & Learn

Research As-of Backtest Methodology Glossary The Playbook Guides & Archive Resources

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