Updated Apr 24, 2026 · 794 articles
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Educational guides about 13F filings, insider trading, institutional investing, and how to track smart money moves.
Understanding AUM in 13F Filings: What the Big Number Really Means
AUM is useful context, but it is not the same thing as conviction. Here is how to read 13F AUM without overstating what a portfolio really says.
Sarah MitchellHow to Read 13D and 13G Amendments Without Overstating Activism
Not every 13D or 13G amendment is a new campaign. Here is how to tell a real control signal from routine ownership maintenance.
Sarah MitchellHow to Read 13F Sector Research Without Overstating Coverage
Sector articles are useful only if you remember they describe a covered stock set, not an entire market. Here is how to read them without overstating what the data proves.
Sarah MitchellHow to Separate 13F Price Effects From Real Position Changes
The Most Common 13F Mistake A 13F position can look bigger because the manager bought more shares, because the stock price rose, or because both happened. It can also look smaller even when the share count increased if
Sarah MitchellHow to Read Mega-Filer 13Fs Without Blindly Cloning Them
Why Mega-Filer 13Fs Need a Different Lens A 13F from a hedge fund, a family office, a bank, and an index manager can all show the same stock table, but the meaning is not the same. A concentrated hedge fund position ma
Sarah MitchellWhy Form 4 Table I and Table II Can Tell Two Different Ownership Stories
A Form 4 can show direct Class A sales in Table I while Table II still reveals millions of derivative or indirect shares. Here is how to read both tables without making a false “owns zero shares” claim.
Sarah MitchellIndex Allocator or Stock Picker? How to Tell What a 13F Manager Really Is
Some 13F filers are better read as asset allocators, while others are better read as concentrated stock pickers. Here is how to tell the difference quickly and why the distinction matters.
Sarah MitchellHow to Build a 13F Watchlist Before the Next Filing Deadline
The best 13F research starts before the filing arrives. Here is how to use the last quarter’s holdings, concentration, new positions and ETF sleeves to build a smarter watchlist ahead of the next deadline.
Sarah MitchellHow ETF and Bond Sleeves Change the Way You Read 13F Conviction Signals
A portfolio packed with ETFs and bond funds should not be read the same way as a concentrated stock-picking book. Here is how ETF sleeves change position-level meaning inside a 13F.
Sarah MitchellThe Family Office Blind Spot in 13F Data: What You Cannot See
Family offices managing trillions globally are largely invisible in 13F filings. Here is why they are exempt, how big the blind spot is, and how to partially fill the gap using other SEC filings.
Marcus ChenUnderstanding 13F Amendment Filings: HR vs HR/A Explained
Not every 13F is the final word. Amendments (13F-HR/A) can restate holdings, reveal hidden positions, and change portfolio data retroactively. Here is how to handle them.
Sarah MitchellWhat 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.
Marcus ChenHow to Compare Institutional Portfolios Using Concentration Metrics
Not all 13F portfolios carry equal signal. Here is how Top-5 concentration and position count help distinguish conviction stock pickers from index trackers.
Marcus ChenWhy 13F Data Is Always 45 Days Old: The Filing Delay Explained
Every 13F filing describes positions from at least 45 days ago. Here is why the delay exists and how to use institutional holdings data correctly.
Sarah MitchellHow to Read 13D/G Filings for Activist Investor Signals
13D filings reveal activist intent while 13G filings signal passive accumulation. Here is how to tell the difference and what each means for stocks you follow.
Sarah MitchellHow Sovereign Wealth Funds Invest Differently Through 13F Filings
Norges Bank holds $935 billion in US equities across 1,577 positions. Here is how sovereign wealth fund 13Fs differ from hedge funds, and why GIC and ADIA should be read through a broader long-term lens.
Sarah MitchellWhat Quarterly AUM Jumps Really Mean: Normal Market Moves vs. New Money vs. Filing Changes
A 10% quarterly AUM move is usually market drift. A 50% move may be new money, a filing-entity reset, or a reporting-basis change. Here is the decision tree investors should use before overreacting to a 13F jump.
Marcus ChenHow Options Market Makers Distort 13F Holdings Data
Susquehanna reports $868 billion in 13F value, but it is an options market maker, not a traditional asset manager. Here is why reported 13F values for firms like SIG, Citadel, and Jane Street do not mean what most investors think.
Sarah Mitchell