- S&P 500 Top 10 Concentration: Has It Passed 40% Again?The S&P 500’s top 10 have exceeded 40% of index value. See how concentration has changed, what drives it, and how to check the live figure yourself.Read · 8 min
- FX Impact on Market Cap: How Investors Measure a 10–20% HitSee how currency translation, operating cash flows, and foreign currency debt affect market cap, and how investors can measure FX shocks with practical...Read · 6 min
- Backtest Sector Allocation With Point in Time Data and Real CostsBuild a reproducible sector allocation backtest with point in time data, walk forward testing, and realistic trading costs to judge whether results hold up.Read · 13 min
- Sector Performance Metrics: 5 Checks, From Z Scores to Equal WeightBuild a repeatable sector scorecard with valuation and momentum z scores, then compare market cap and equal weighted returns to spot concentrated rallies.Read · 12 min
- Closing Prices vs. Intraday Prices: Why 4 PM Sets the BenchmarkSee how closing auctions and last sale rules establish the official price, when intraday ticks matter, and how delayed quotes can shape trade decisions.Read · 8 min
- S&P 500 Tech Sector Weight: Nearly 40%, Verify It LiveThe S&P 500’s tech sector now accounts for nearly 40% of the index. See how concentration grew and verify the live weight with MarketCapLens.Read · 11 min
- Delayed Quotes: When Individual Investors Should Pay for Live DataLearn when individual investors need quotes as they update, how to verify feed freshness, and what SEC and FINRA rules mean before paying for live data.Read · 14 min
- Size Factor Investing: Check SMB Before Buying Small CapsSee why size returns cluster in microcaps, and use MarketCapLens to check decile composition, liquidity, and quality filters before investing in small caps.Read · 7 min
- Daily Market Performance: 2,500+ Company Data to Spot Narrow RalliesA concise daily snapshot pairing index closes with breadth, volume, and sector checks. Use MarketCapLens' 2,500+ company data and a practical checklist to...Read · 16 min
- Five Step Portfolio Audit for Market Cap Concentration With Live DataSpot and manage market cap concentration using live index metrics and a five-step portfolio audit. See when top-10 weight reflects earnings and when to act.Read · 7 min