Sarah Mitchell
Education Editor
Investment Education Editor at 13F Insight. Breaks down complex institutional data into actionable insights for individual investors.
A note from Sarah
Hi, I'm Sarah. I spent four years at Vanguard's Investor Education team, where my whole job was making 401(k) statements feel less like tax forms and more like something a person could actually understand.
I'm here at 13F Insight to do the same thing for institutional data. If you've ever read a headline like "Berkshire Bought Apple" and thought "okay but what does that actually mean for me," that's the gap I want to close.
I'll never assume you know what a CUSIP is. I'll always tell you why a number matters before I give you the number. And if a guide of mine ever leaves you more confused than you started, that's on me — let me know and I'll rewrite it.
Articles by Sarah Mitchell (326)
- Learn
How to Identify Passive vs Active Managers in 13F Data
Learn the critical difference between index-tracking giants like Vanguard and high-conviction stock pickers like Michael Burry to find real smart money signals.
- Learn
What is AUM? The 13F Insight Guide to Assets Under Management
Learn what Assets Under Management (AUM) means for institutional investors, why 13F reported values differ from total economic AUM, and how to track the 'Smart Money'.
- Learn
What is AUM? The 13F Insight Guide to Assets Under Management
Understanding Assets Under Management (AUM) is critical for institutional tracking. This guide explains the nuances of AUM, why 13F AUM differs from total economic AUM, and how to interpret major shifts.
- Learn
The Power of the Crowd: How to Use Consensus Holdings to Find Institutional Favorites
When multiple 'Whales' pile into the same stock, it's more than a coincidence—it's a consensus. Learn how to use 13F overlap data to identify the most conviction-heavy picks in the institutional market.
- Learn
Smart Money Signals: How to Track Hedge Fund Portfolios Using 13F Data
Learn how to use 13F filings to peek into the portfolios of the world's most successful hedge funds. A step-by-step guide to tracking 'Whale' moves and identifying high-conviction institutional trades.
- News
Martine Rothblatt's $1 Billion Liquidity Event: Decoding the CEO's Systematic Exercise-and-Sell Pattern
United Therapeutics CEO Martine Rothblatt has executed over $1 billion in stock sales through a disciplined option exercise program. We analyze the 13F institutional backdrop and what this means for UTHR shareholders.
- News
Tesla's $158 Billion Question: How Institutional Giants View Musk's Record Pay Package
Tesla has disclosed a staggering $158 billion value for Elon Musk's 2025 pay package. We dive into the 13F data to see how the 'Big Three' indexers and active whales are positioned ahead of a critical governance showdown.
- Learn
How to Spot 'Window Dressing' in Institutional Portfolios
Learn how institutional managers use the end of the quarter to 'clean up' their 13F filings, and how you can spot these deceptive signals.
- Learn
Understanding AUM: What Assets Under Management Really Means
AUM is the headline figure for every major fund, but 13F AUM is often very different from a firm's total assets. Learn what's included, what's missing, and why it matters.
- Learn
How to Tell Passive Managers from Active Stock Pickers in 13F Data
Not all institutional investors are looking for 'alpha.' Learn how to distinguish between passive index trackers and high-conviction active managers using SEC 13F filings.
- Learn
13D vs 13G: Understanding Activist Signals and Passive Holdings
Know the difference between a high-stakes activist stake (13D) and a routine institutional filing (13G). A guide to SEC beneficial ownership filings.
- Learn
Whale Scores Demystified: How to Rank Institutional Investors by Quality
Not all institutional 13F filings are created equal. We explain how our Whale Score ranks managers by conviction and performance.
- Learn
From 13F to Form 4: How to Build a Complete Institutional & Insider Watchlist
Master the art of synthesizing SEC filings. We provide a framework for combining institutional moves with insider signals for high-conviction stock ideas.
- Learn
Inside the Multi-Class Trap: How Form 4 Table I Misleads About Insider Ownership
Why a "zero share" balance on a Form 4 doesn’t always mean an insider has exited. We demystify Table I vs. Table II for smarter investor analysis.
- News
AstraZeneca Stock Falls on FDA Panel Rejection: Why PRIMECAP and 891 Institutions Remain Anchored
AstraZeneca (AZN) faces a clinical setback as an FDA panel votes against camizestrant. We look at the institutional holder base for signs of long-term conviction.
- Learn
Separating 10b5-1 Sales from Discretionary Insider Signals
Not all insider selling is bearish. Learn how to distinguish between scheduled diversification plans and genuine discretionary conviction changes.
- Learn
How to Track Hedge Fund Portfolios: Turning 13F Data into Actionable Intelligence
Learn the professional way to track hedge fund 13F filings. Discover how to identify elite whales, filter for concentration, and spot institutional consensus.
- Learn
What Is a 13D Filing? Understanding Activist Investor Positions
Learn how the SEC Schedule 13D filing helps you identify activist investor entries and potential catalysts for corporate change.
- Learn
Understanding Portfolio Concentration: When Fewer Holdings Mean More
Learn why institutional portfolio concentration is a powerful signal of conviction and how to use Top-10 weighting to find the best investment ideas.
- Learn
What Is a 13F Filing? A Beginner's Guide to Institutional Holdings
Learn the basics of SEC Form 13F, who is required to file, and how you can use this data to track the world's most successful investors.