--- title: What WhaleScore Means and How to Use It on 13F Insight type: learn slug: what-whalescore-means-how-to-use-it canonical_url: https://13finsight.com/learn/what-whalescore-means-how-to-use-it published_at: 2026-04-14T20:50:47.162Z updated_at: 2026-04-14T20:50:47.163Z author: Marcus Chen author_title: Senior Market Analyst author_url: https://13finsight.com/authors/marcus-chen word_count: 233 locale: en source: 13F Insight --- # What WhaleScore Means and How to Use It on 13F Insight > WhaleScore is a portfolio quality heuristic on 13F Insight that ranges from 0 to 100. Here is what it measures, how to interpret it, and how to use it for smarter institutional research. When browsing institutional filers on 13F Insight, you will notice a WhaleScore next to each filer. This metric ranges from 0 to 100 and serves as a portfolio quality heuristic — a quick way to gauge whether a filer's holdings data carries genuine investment signal.TL;DRWhaleScore is a composite metric that reflects how signal-rich a filer's 13F appears.It considers scale, concentration, consistency, and filing patterns.Berkshire Hathaway scores 85.75 — the highest among major filers.Options market makers and custodian banks tend to score lower because their holdings reflect trading/custody, not investment conviction.What WhaleScore MeasuresWhaleScore synthesizes multiple dimensions of portfolio quality:Scale: Larger portfolios from established managers score higher.Concentration: Portfolios with meaningful position sizes (not thousands of tiny positions) score higher.Consistency: Filers with stable, predictable filing patterns score higher than those with erratic reporting.Signal density: Holdings that reflect genuine investment decisions rather than hedging, market-making, or custody activities score higher.WhaleScore RangesRangeInterpretationExamples80+Exceptional signal qualityBerkshire (85.75), CTC LLC (84.50)70-80High quality, active convictionCapital World (73.00), Capital Intl (73.50)60-70Solid institutional signalGoldman Sachs (67.75), Wells Fargo (65.25)Below 60Weaker signal (broad/trading-heavy)Some wealth platforms, market makersPractical UsesFilter your research: Focus on high-WhaleScore filers when looking for investment ideas.Weight position signals: Changes from a 85+ WhaleScore filer carry more weight than from a 60.Identify hidden gems: Lesser-known filers with high WhaleScores (like CTC LLC at 84.50) may be worth following.Contextualize holdings: Low WhaleScore warns you that holdings may reflect trading activity rather than investment conviction.FAQ ## FAQ ### What is a good WhaleScore? Above 70 indicates high-quality signal. Above 80 is exceptional. The highest score among major filers is Berkshire Hathaway at 85.75. ### Does a low WhaleScore mean the filer is bad? No. It means their 13F data carries less investment signal. Options market makers may have low WhaleScores because their holdings reflect hedging, not directional bets. ### Can WhaleScore change over time? Yes. WhaleScore is recalculated as filing patterns and portfolio characteristics evolve. A filer that becomes more concentrated or consistent may see their score increase. ### Should I ignore low-WhaleScore filers entirely? Not necessarily. Some low-WhaleScore filers like custodian banks reveal broad market trends. But for individual stock ideas, focus on higher scores. --- Source: 13F Insight — https://13finsight.com/learn/what-whalescore-means-how-to-use-it Author: Marcus Chen — https://13finsight.com/authors/marcus-chen Last updated: 2026-04-14T20:50:47.163Z