Updated Apr 28, 2026 · 644 articles
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Educational guides about 13F filings, insider trading, institutional investing, and how to track smart money moves.
How to Read Covered Sector Pages Without Overclaiming Full-Sector Ownership
Sector pages are snapshots of covered names, not complete industry censuses. This guide explains how to use them correctly without turning partial coverage into total-sector claims.
Sarah MitchellWhen Holder Count Matters and When It Does Not
Institutional holder count can be useful, but only in the right context. This guide explains when a high or low count is genuinely informative and when it is just noise.
Sarah MitchellHow to Tell a Real Position Exit From a Mere Ranking Drop
A stock leaving a top-five table does not always mean a fund sold it. This guide shows how to distinguish a true exit from a lower ranking caused by other positions rising faster.
Sarah MitchellHow to Use Historical Quarter Pages Without Creating False Signals
Historical quarter pages are useful because they freeze old portfolio states. They become dangerous when readers treat them like current holdings pages. This guide explains the right workflow.
Sarah MitchellHow to Read Passive Funds and Market Makers in Holder Tables Without Mistaking Them for Conviction Buyers
Top-holder lists can mislead if readers treat index managers, market makers and custodians like active stock pickers. This guide explains how to separate ownership presence from true conviction.
Sarah MitchellWhat Is a 13F Filing? A Beginner's Guide to Institutional Holdings
A 13F filing is a quarterly SEC report that shows many large investment managers' U.S. equity holdings. The useful part is not the form itself but how to read position size, concentration, and lag.
Sarah MitchellWhat Is a 13D Filing? Understanding Activist Investor Positions
A Schedule 13D usually appears when an investor crosses 5% ownership and may want to influence the company. It matters because it can reveal intent, not just exposure.
Sarah MitchellHow to Filter Passive Overlap Out of Consensus Holdings
Consensus data gets more useful once you strip out passive overlap, custodial noise, and shallow legacy positions.
Sarah MitchellWhen ETF Exposure Hides the Real Stock-Picking Story
An ETF-heavy 13F can look stock-specific on the surface while actually signaling liquidity sleeves, model exposure, or portfolio infrastructure.
Sarah MitchellHow To Read Holder Depth Before a Biotech Catalyst
Before you react to a biotech trial headline, learn how to separate broad holder count, active depth, 13D/G context and insider activity into one repeatable pre-catalyst workflow.
Sarah MitchellHow To Read 13F Turnover Without Chasing Every New Position
A filing can show dozens of new positions and dozens of exits without signaling a full thesis reset. This guide shows how to separate real conviction from routine book maintenance.
Sarah MitchellHow To Tell A Post-Earnings Rerating From A One-Day Pop
Some earnings reactions change the market’s long-term view of a stock. Others are just relief bounces. This guide shows how ownership and guidance help you tell the difference.
Sarah MitchellWhat A Strategic Holder Exit Actually Changes For A Stock
When a strategic or corporate holder sells down a large position, the biggest effect may be market structure rather than sentiment. This guide explains how to read those exits.
Sarah MitchellHow To Read 10b5-1 Sales Without Throwing Away Insider Data
A 10b5-1 label weakens the same-day sentiment signal, but it does not make a Form 4 irrelevant. This guide shows what still matters after you identify a planned sale.
Sarah MitchellHow To Use Holder Depth Before An Earnings Release
An earnings date tells you when a stock might move. Holder depth helps you judge how the move might stick. This guide shows how to use institutional ownership before a catalyst hits.
Sarah MitchellHow To Separate Strategic Stake Sales From Bearish Insider Signals
Not every large Form 4 sale means management is turning negative. This guide shows how to separate strategic stake monetization, 10b5-1 selling, and real discretionary warning signs.
Sarah MitchellHow To Use Holder Depth After Biotech Trial News
Biotech news can move a stock before most investors have time to separate clinical evidence from ownership risk. Holder depth gives a second lens: who already owned the company, whether active specialists were involved, and whether a 13D/G filer or strategic holder changes the interpretation.
Sarah MitchellHow To Audit 13F AUM Spikes Before Copying A Fund
A sudden jump in reported 13F value can look like a manager made a dramatic new market call. Often it is something more ordinary: a reporting-scope change, account transfer, market-price move, options notional exposure, or a filer whose latest quarter should be normalized before investors draw conclusions.
Sarah MitchellHow to Use Top-Ten Concentration Before Copying a 13F
Top-ten concentration is one of the fastest ways to decide whether a 13F filing is a focused investment map or a broad market census. A portfolio with 70% in ten names behaves differently from a portfolio with 30% in ten names, even if both show the same stocks on the first page.
Sarah MitchellHow to Separate an Index Spine From Active 13F Stock Picks
A large 13F portfolio can look exciting because the biggest holdings are famous companies. That does not make every line a fresh stock-picking signal. The largest positions in many institutional filings are the index spine: the holdings a manager owns because those companies dominate the benchmark, client mandate or model portfolio.
Sarah Mitchell