The market cap formula, plus the free-float, share-count and identifier problems that break it at index and ETF scale.
Fundamentals
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S&P P/E: Trailing, Forward, Weighted
How the S&P 500 P/E ratio is actually constructed, why vendor numbers disagree, and how to rebuild it from a holdings file.
Fundamentals
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Earnings Report Data: 2026 Mechanics
How earnings reports move from filing to calendar to index and ETF holdings data, with timing, revisions, and what calendars miss.
Fundamentals
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S&P 500 PE Ratio: How It’s Computed
Why published S&P 500 P/E values disagree, how each one is built, and how to compute trailing and forward multiples from holdings data.
Fundamentals
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Shares Historical Price: Sources & Gaps
How share price history is built, where adjusted close breaks, and how to rebuild series for renamed, delisted and multi-class shares.
Fundamentals
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Investment Research Platforms: 2026 Rank
The 2026 ranking of investment research platforms, judged by data layer, delivery format, identifiers and history rather than screenshots.
Fundamentals
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Historical Share Values: Sources & Pitfalls
Where historical share values come from, how adjusted closes distort them, and why price history alone cannot rebuild an index or ETF.
Fundamentals
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Earnings EPS: Filings to Index Level
What EPS is, how basic, diluted and adjusted differ, and how to aggregate earnings EPS across an index from holdings data.
Fundamentals
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P/E Multiple S&P 500: 2026 Methods
Why the S&P 500 P/E multiple differs by source, how each aggregation method works, and how to rebuild the number from holdings.
Fundamentals
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ETF Holdings Data Availability 2026
When ETF holdings data is actually published, by whom, at what lag, and how to build against issuer, aggregator and vendor sources.