Updated Apr 12, 2026 · 794 articles
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Educational guides about 13F filings, insider trading, institutional investing, and how to track smart money moves.
Why Position Sizing Matters More Than Just 'New Buys' in 13Fs
A hedge fund buying a new stock makes headlines, but true conviction is revealed in how a fund sizes its positions over multiple quarters.
Sarah MitchellDecoding 13F Options: How to Read Call vs. Put Ratios Like a Pro
Don't just look at the stock holdings. Discover how hedge funds use massive options books to signal leverage, hedging, or downside expectations.
Sarah MitchellUnderstanding Institutional Cash-to-Equity Shifts Through the 13F Lens
When a fund’s reported 13F value falls during a rising market, something important may be happening outside the visible equity book. Here is how to read that signal.
Marcus ChenHow to Use 13D/G Filing Dates as Trading Signals: A Practical Framework
13D and 13G filings can matter as much for timing as they do for ownership. Learn why the filing date itself often changes the signal — especially when activist intent is involved.
Sarah MitchellReading Between the Lines of 13F Amendments: What Revised Filings Reveal
An amended 13F is more than paperwork. It can reveal corrected positions, newly visible holdings, or a very different picture than the original filing suggested.
Marcus ChenThe Hidden Risks of Following Institutional Trades: Lag, Liquidity, and Position Sizing
A famous fund name on a 13F can be useful, but copying the trade blindly is where retail investors get into trouble. Here is how delay, liquidity, and sizing distort the signal.
Sarah MitchellHow Window Dressing Distorts 13F Data — And How to Spot It
Quarter-end portfolio cleanup can make a 13F look smarter than the manager really was. Learn how to spot window dressing before you mistake cosmetic buying for conviction.
Marcus ChenMastering the Insider Cluster Signal: How to Spot Multiple Executives Buying at the Same Time
A single insider buy is interesting, but an 'insider cluster' is powerful. Learn how to identify when multiple executives are buying at once.
Sarah MitchellWhy Institutional Selling Doesn't Always Mean a Bearish Thesis: Rebalancing vs. Conviction Shifts
Don't panic when you see a fund trimming its top holdings. Learn how to distinguish between tactical rebalancing and a real shift in investment thesis.
Sarah MitchellDecoding 13F vs. 13D Filings: Why One Is a Quarterly Snapshot and the Other is a Red Alert
Learn the critical differences between delayed 13F reports and the rapid-fire 13D filings that signal active institutional moves.
Sarah MitchellHow to Read Position Rank Changes Without Overreacting to Market Moves
A stocks rank in a portfolio can jump even when the manager barely touched the shares. Here is how to read rank changes without turning market movement into a false signal.
Sarah MitchellHow to Use Stock Holder Pages to See If a Trade Is Crowded
Before you chase a popular idea, check the stock holder page. It is the fastest way to see whether a trade is truly crowded or just widely known.
Sarah MitchellHow to Read Mega-Cap Overlap Without Assuming Funds Are Copying Each Other
Lots of filers own the same mega-cap names. That does not mean they share the same thesis. Here is how to tell real consensus from shallow overlap.
Sarah MitchellHow to Use Insider Profiles With 13F Data to Build Event-Driven Watchlists
The best watchlists combine institutional ownership with insider behavior. Here is a practical workflow using insider profiles, stock pages, and filer pages together.
Sarah MitchellWhen 13F AUM and Holdings Value Do Not Match: A Simple Sanity Check
Sometimes the headline 13F AUM and the visible holdings sum tell different stories. Here is how to sanity-check the numbers before you repeat the wrong one.
Sarah MitchellHow to Read ETF Positions in a 13F Without Mistaking Them for Stock Picks
ETF-heavy filings can look active when they are really just broad exposure sleeves. Here is how to spot the difference before you copy the wrong signal.
Sarah MitchellHow to Use Historical Quarter Pages to Find Real Position Changes
Historical quarter pages are the easiest way to stop comparing the wrong snapshots. Here is how to use them to isolate real change instead of filing-noise.
Sarah MitchellHow to Compare Two 13F Filers Without Letting AUM Fool You
A bigger 13F portfolio does not automatically mean a better idea source. Here is a cleaner way to compare managers using concentration, turnover, and stock-level context.
Sarah Mitchell