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 (822)
- Learn
How 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.
- Learn
What 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.
- Learn
How 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.
- Learn
How 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.
- Learn
How 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.
- Learn
How 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.
- Learn
What 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.
- Learn
How 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.
- Learn
How 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.
- Learn
How 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.
- Learn
What 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.
- Learn
How 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.
- Learn
How 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.
- Learn
Why 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.
- Learn
How 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.
- Research
Franklin Templeton's $408B Q4 Portfolio: Microsoft Over NVIDIA, Citigroup at $4B, and Cisco Built 18% — The Global Active Manager That Bets Differently
Franklin Resources — the parent of Franklin Templeton, one of the world's oldest fund families — files $408B with 14,263 positions. Its Q4 2025 13F has Microsoft over NVIDIA at #1, a massive $4B Citigroup bet, Cisco built 18%, and Exxon in the top 10. This is active management that refuses to follow the momentum crowd.
- Research
BNY Mellon Files 33,186 Positions in Its Q4 13F — More Than Any Other Filer in Our Database. Here's What the Oldest U.S. Bank Reveals About the Market.
Bank of New York Mellon's $568B Q4 2025 13F has more positions than any other institutional filer we track — 33,186. Founded by Alexander Hamilton in 1784, the custody bank's portfolio is less an investment thesis and more a census of American equity ownership.
- News
The Man Who Invented Your Cell Phone Signal Sold $712 Million in Qualcomm Stock Over 9 Years. Then He Gave Away Billions More.
Irwin Jacobs co-founded Qualcomm, pioneered CDMA technology that powers every 3G/4G/5G phone on Earth, and filed 5,491 insider transactions — nearly all sells and gifts. His methodical exit from the company he built is a masterclass in founder wealth management.
- Research
UBS Group’s $616.68B Q4 2025 13F Looks Rebuilt: Every Top Holding Shows Up as New
UBS Group AG’s Q4 2025 13F reported $616.68B, but the bigger signal is structural: the top of the U.S. portfolio reads like a rebuilt book, suggesting Credit Suisse integration and account migration effects still matter.
- Research
Capital World Investors' $735.30B 13F Put Broadcom Ahead of NVIDIA
Capital World Investors ended Q4 2025 with $735.30B across 574 positions, led by Broadcom instead of NVIDIA — a revealing look at how one of the world's largest active stock pickers is positioning for a broader market.