Updated Mar 7, 2026 · 798 articles
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Educational guides about 13F filings, insider trading, institutional investing, and how to track smart money moves.
Why Mega-Cap Overlap Does Not Mean Two Funds Are Clones
Many institutional portfolios share the same famous names. That does not make them copies. Weight, breadth, and supporting sleeves still matter.
Sarah MitchellHow to Tell Whether a Stock Is a Real Thesis or Just a Benchmark Artifact
Many large funds own the same stocks. The key is figuring out whether a name is a deliberate conviction call or just inherited from the benchmark.
Sarah MitchellWhat Top-Ten Breadth Tells You That Top-Five Concentration Misses
Top-five concentration is useful, but top-ten breadth often gives a better sense of how much room is left outside the headline names.
Sarah MitchellHow to Use 1%, 3%, 5%, and 10% Position Weights in 13F Analysis
Position-weight thresholds help you separate noise from genuine conviction. Here is a practical way to use 1%, 3%, 5%, and 10% in 13F reading.
Sarah MitchellHow to Read Sector ETF Signals Without Overstating the Bet
A sector ETF line like XLK can matter, but only in proportion to the full portfolio. Here is how to read those signals without exaggerating them.
Sarah MitchellHow to Compare Mega-Filers With Boutique Managers Without Getting Misled by Scale
Raw dollars make giant filers look more decisive than they really are. Percentage weight, concentration, and portfolio role are better comparison tools.
Sarah MitchellHow to Read Options-Heavy 13Fs Without Confusing Exposure and Conviction
Options-heavy 13Fs can look extremely bullish or bearish on the surface. The right reading is usually subtler: they often express payoff design, not pure stock conviction.
Sarah MitchellWhat a New QQQ or XLK Position Really Signals in a 13F
A new QQQ or XLK line often means more than simple tech optimism. It can mark a deliberate factor, sector, or timing overlay on top of a broader portfolio.
Sarah MitchellHow to Tell If a Fund Is Benchmarking or Actually Tilting
Some 13F portfolios mostly mirror the market. Others add real style or thematic tilts on top. Here is how to tell the difference quickly.
Sarah MitchellHow to Read Bond and Cash ETF Sleeves Inside a 13F
Bond and short-duration ETF positions often reveal how cautious or balanced a manager really is. Here is how to read those sleeves instead of skipping past them.
Sarah MitchellHow to Use 13F and Form 4 Together to Build a Better Investment Thesis
13F filings tell you what institutions are doing. Form 4 filings tell you what insiders are doing. The real edge comes from reading both together without forcing them to mean the same thing.
Sarah MitchellWhat Top-Five Concentration Really Tells You About a Fund
Top-five concentration is one of the fastest ways to see whether a 13F belongs to an allocator, a concentrated stock picker, or something in between.
Sarah MitchellHow to Read ETF-Heavy 13F Filings When the Signal Is Allocation, Not Stock Picking
Some 13F filings are not trying to tell you which stock will win. They are telling you how a manager is allocating risk across broad markets, factors, income, and growth.
Sarah MitchellHow to Compare Two 13F Filers Without Getting Fooled by AUM
The biggest portfolio is not always the most useful one to study. To compare two 13F filers well, you need to normalize for size, concentration, turnover, and what each filing is actually built to do.
Sarah MitchellWhy Put Options Show Up in 13F Filings and What They Don't Mean
A put option in a 13F is not the same thing as a simple bearish bet. Without context, many investors overstate what an options line really says about risk and direction.
Sarah MitchellHow to Read 13F Position Changes: New, Added, Trimmed, and Exited
Most investors jump straight to the holdings table. The better habit is to read what changed: which positions are new, which got bigger, which were cut, and which disappeared entirely.
Sarah Mitchell13F Filing Season Guide: What to Watch and When
13F filing season happens four times a year, 45 days after each quarter ends. Learn the exact deadlines, what to watch for, and how to use 13F Insight to track institutional portfolio changes as they're filed.
Sarah MitchellHow to Read Whale Scores: Measuring Institutional Investor Quality
Whale Scores rank institutional investors on a 0-100 scale using three factors: AUM size, portfolio concentration, and filing activity. Learn how to interpret them and find high-conviction money managers.
Sarah Mitchell