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 (810)
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Quality Growth vs Deep Value: Two Kinds of Value Investing
Both deep value and quality growth want to pay less than a business is worth, but they disagree on where worth comes from. Learn how to tell the two camps apart in a 13F, and why the same ticker can be a very different bet depending on who owns it.
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What Is a Margin of Safety? The Core of Value Investing
Benjamin Graham called margin of safety the three most important words in investing. It means buying below a conservative estimate of value so that ordinary errors cost your buffer, not your principal, and it leaves clear fingerprints in how value managers hold.
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Patient Investing: Time Horizon as an Edge
A longer time horizon is one of the few durable edges in markets. Here's why patience pays, how it shows up in a 13F, and why it's so rare.
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Total Shareholder Yield: Beyond the Dividend
Dividend yield is only half the story. Total shareholder yield adds buybacks — here's why it reframes how you read a fund's income and capital-return tilt.
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Mid-Cap Investing: The Overlooked Middle Ground
Between megacaps and small-caps lies the mid-cap sweet spot. Here's what mid-cap investing is, why managers favor it, and how a mid-cap 13F reads.
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Value Traps: When Cheap Stocks Stay Cheap
The biggest risk in value investing isn't overpaying — it's the value trap, a cheap stock that's cheap for a reason. Here's how to spot one in a value 13F.
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Currency Exposure: The Hidden Layer in Foreign Holdings
When a fund owns foreign stocks or ADRs, its dollar returns carry a currency effect a 13F never shows. Here's how FX exposure hides in international holdings.
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Small-Cap Investing: Reading a Small-Cap 13F
Small-cap funds fish in under-covered waters with hundreds of tiny positions. Here's what small-cap investing is and why a small-cap 13F looks so different.
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GARP: Growth at a Reasonable Price, Explained
Many funds refuse to choose between value and growth — they practice GARP, buying growers at sensible prices. Here's what GARP is and how its 13F reads.
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Disruptive-Innovation Investing: Betting on the Future
Some funds buy tomorrow's winners — unprofitable innovators in AI, genomics, and fintech. Here's what disruptive-innovation investing is and how its 13F reads.
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Key-Person Risk: When a Fund Is One Person
Many tracked funds depend on a single star manager. Here's why key-person risk matters when you follow a fund's 13F — and how a leadership change can show up in the data.
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A Fund's First 13F: Why New Filers Are Worth Watching
Every quarter, funds cross the $100M threshold and file a 13F for the first time, revealing a once-private book in full. Here's how to read a debut filing.
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Survivorship Bias: The Trap in Following Famous Funds
Tracking only legendary investors hides the many who used the same strategies and failed. Here's how survivorship bias distorts 13F analysis — and how to avoid it.
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Style Drift: When a 13F Stops Matching the Mandate
A value fund full of growth stocks? A small-cap manager holding megacaps? That's style drift. Here's how to spot it in a 13F and why it matters.
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Crossover Funds: The Public-Private 13F
Crossover funds like Coatue invest before and after IPOs — but their 13F shows only the public half. Here's how to read a crossover fund's filing.
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Founder-Led Companies: Why Investors Seek Them
Many long-term investors favor founder-led companies for their alignment and long-term mindset. Here's why the theme recurs in 13Fs — and the governance risks.
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Insurance Float: Why Insurers Hold Big Stock Portfolios
Insurers like Berkshire run huge equity 13Fs thanks to float — premiums they invest before paying claims. Here's how float works and why it makes insurers great investors.
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Pension Funds as 13F Filers: How to Read Them
CalPERS and state retirement systems file 13Fs too — but their books are largely indexed and externally managed. Here's how to read a pension fund's filing.
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Capital Allocation and Buybacks: Reading How Firms Use Cash
How management spends a company's cash — reinvesting, acquiring, or buying back stock — can make or break an investment. Here's why it shapes quality 13F portfolios.
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Return on Invested Capital: The Quality Metric
ROIC measures how well a company turns capital into profit, and it's the number quality investors care about most. Here's why ROIC drives so many 13F portfolios.