The Moat Index

The Moat Index Reports.

The Index isn't just a page — it's a publishing beat. Each report below is built from primary SEC filings and refreshes as companies file. They're free to cite, quote, and link. If you write about business quality or value investing, this is your raw material.

Standing report

America's Widest Moats

The full ranking of large U.S. companies by moat durability, scored from SEC filings.

Currently led by FORTINET, INC..

Read the report →Quarterly screen

Quality on Sale

Wide- and narrow-moat businesses trading below a conservative estimate of intrinsic value.

40 names clear the screen right now.

Read the report →Quarterly report

Moat Movers

The businesses whose moat widened or eroded most — visible only because the history is kept.

Comes alive as scoring runs accumulate.

Read the report →

Methodology is public and every score is stamped with the version that produced it, so the numbers stay comparable over time. Educational only — not investment advice. See the methodology.