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)
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How to Check Form 4 Table I and Table II Before Calling an Insider Exit
A sale to low Class A ownership is not a full exit until Table II and beneficial ownership records are checked.
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How to Build a Next-13F Checklist After Market News
A market-news headline becomes more useful when translated into dated checks for earnings, filings, and share-count changes.
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How to Use Active Holder Depth After Market News
A practical guide for reading institutional filings without overclaiming what the data proves.
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How to Separate 10b5-1 Sales From Discretionary Insider Signals
A practical guide for reading institutional filings without overclaiming what the data proves.
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How to Read Low-Concentration 13F Portfolios
A practical guide for reading institutional filings without overclaiming what the data proves.
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How to Read ETF Sleeves Inside 13F Portfolios
A practical guide for reading institutional filings without overclaiming what the data proves.
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How to Check Index Overlays Before Reading AI Stock Bets
A practical guide for reading institutional filings without overclaiming what the data proves.
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How to Use Holder Depth After Regulatory Stock News
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Separate Price Moves From Share Count Changes
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Read Mega-Filer 13F Portfolios Without Overclaiming
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Read 13F Data After AI Infrastructure Headlines
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Compare Active and Passive Holders on Stock Pages
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Check an Insider Sale Against 10b5-1 Plans and Remaining Ownership
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Build a Quarterly Filing Verification Checklist
A practical 13F Insight guide for reading ownership data with better context and fewer false signals.
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How to Build a 13F Watchlist From AI Infrastructure News
An AI infrastructure watchlist should start with companies that appear repeatedly in capex, cloud, accelerator and model-distribution stories. A practical first screen is <a href="/stocks/MSFT">Microsoft</a>, <a href="/stocks/GOOGL">Alphabe
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How to Read Cross-Stock Sector Concentration Without Overclaiming
Sector concentration is useful only when you describe the data boundary. If you are looking at covered large-cap technology names, say that. Do not call it the entire technology sector. The same caution applies when comparing <a href="/stoc
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How to Separate Index Ownership From Active Whale Signals
Index ownership and active whale signals answer different questions. Index ownership explains why <a href="/stocks/AAPL">Apple</a>, <a href="/stocks/NVDA">Nvidia</a> and <a href="/stocks/MSFT">Microsoft</a> have huge holder bases. Active wh
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How to Use Top-Holder Mix After Mega-Cap Layoffs
Mega-cap layoffs can mean cost discipline, restructuring pressure or a funding shift toward AI. The top-holder mix helps decide which interpretation has institutional support. Start with the stock page for <a href="/stocks/MSFT">Microsoft</
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How to Check a CEO 10b5-1 Sale Against Beneficial Ownership
A CEO stock sale is not complete analysis until you compare the Form 4 transaction table with remaining beneficial ownership. The <a href="/insiders/prince-matthew-0001786925">Matthew Prince</a> and <a href="/stocks/NET">Cloudflare</a> exam
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How to Read AI Capex News Through 13F Holder Depth
AI capex headlines are easier to understand when you first map holder depth. A company like <a href="/stocks/MSFT">Microsoft</a> or <a href="/stocks/GOOGL">Alphabet</a> may announce a huge AI commitment, but the filing question is whether i