Updated Apr 25, 2026 · 656 articles
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Educational guides about 13F filings, insider trading, institutional investing, and how to track smart money moves.
How Form 4 Table II Can Change the Insider Ownership Story
Table I can show a small Class A balance while Table II and beneficial ownership filings show much larger control or economic exposure.
Sarah MitchellHow to Separate Planned Insider Sales From Real-Time Bearish Signals
Rule 10b5-1 sales, tax withholding and option exercises need different treatment than discretionary open-market insider selling.
Sarah MitchellWhy a 13F Sector Map Is Not the Same as Total Sector Allocation
Sector maps are useful, but they usually cover selected large-cap names rather than every investable company in the sector.
Sarah MitchellHow to Read Holder Type Labels Before Calling a 13F Position Smart Money
Holder type labels help investors separate active managers from index funds, custodians and market makers before drawing conclusions from 13F data.
Sarah MitchellHow to Compare Funds That Own the Same Stock Without Assuming the Same Thesis
A practical guide to comparing two or more funds that hold the same company, without treating shared ownership as proof that they are making the same bet.
Sarah MitchellHow to Read Turnover in 13F Filings Without Overreacting
A practical guide to interpreting new positions, exits and portfolio churn in 13F data without mistaking every line-item change for a dramatic shift in conviction.
Sarah MitchellHow to Tell Passive Holders From Active Conviction on a Stock Page
A practical framework for classifying benchmark owners, active managers, and trading firms when you read a stock holder table.
Sarah MitchellHow to Compare an AI Holder Base With a Defensive Holder Base
Use 13F Insight to compare how different kinds of institutional ownership change the meaning of a market headline.
Sarah MitchellHow to Read Multi-Class Insider Ownership Without Making False Exit Calls
A practical guide to reading Form 4 Table I, Table II, and 13D/G context so you do not confuse direct-share sales with full exits.
Sarah MitchellHow to Read a Stock Holder Base After an Earnings Beat
A practical framework for using 13F Insight holder tables after a company reports earnings or announces a major corporate event.
Sarah Mitchell13F Filing Season Guide: Key Dates and What to Watch
A practical calendar for 13F season, including when filings land, what changes matter most and how to avoid overreacting to quarter-end snapshots.
Sarah MitchellHow to Track Hedge Fund Portfolios With 13F Data: A Practical Guide
A practical workflow for turning delayed 13F filings into a repeatable research process instead of a pile of stale manager snapshots.
Sarah MitchellWhat Is a 13D Filing? Understanding Activist Investor Positions
A practical guide to what Schedule 13D and 13G filings reveal about large beneficial owners, activist pressure and strategic stakes.
Sarah MitchellWhat Is a 13F Filing? A Practical Guide to Institutional Holdings
A plain-English guide to what 13F filings show, what they miss, and how to use them without over-reading quarter-end positions.
Sarah MitchellHow to Read Whale Scores: Measuring Institutional Investor Quality
Whale Scores are useful only if you understand what they are summarizing: manager quality, persistence, concentration and behavior, not just raw AUM.
Sarah MitchellHow to Read Quant 13F Filings Without Faking Conviction
Quant 13F portfolios can look like high-conviction stock picking when they are really diversified risk books. Here is how to read them without forcing a narrative the filing does not support.
Sarah MitchellHow to Read Cross-Border 13F Books Without Missing the Risk
Cross-border 13F filers often mix U.S. mega-cap tech with home-market banks, commodities, and currency-sensitive names. Here is how to read that blend without flattening it into one theme.
Sarah MitchellWhy Reported 13F AUM and Holdings Sums Can Diverge
A manager’s reported total 13F value does not always line up perfectly with the sum of visible holdings. This guide explains why the mismatch happens and how to read it safely.
Sarah MitchellHow to Use 13D and 13G Filing Clusters With 13F Holder Data
A 13D or 13G filing becomes more useful when you read it next to the institutional holder base. This guide explains how to combine threshold filings with 13F data without overreacting.
Sarah MitchellHow to Read a Diversified 13F Portfolio When the Top 10 Stays Under 30%
Many institutional portfolios look boring because no single position dominates. This guide explains how to read diversified 13F books without mistaking breadth for lack of conviction.
Sarah Mitchell