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 (815)
- Learn
Whale Scores: Measuring Investor Quality
A practical guide to 13F Insight's whale_score: what it ranks, what it does not prove, and how retail investors can use it to discover institutional filers worth studying.
- Research
Brookfield Q1 2026: BAM Is 71.44% of 13F
Brookfield Corp /ON/ reported a $74.23B Q1 2026 13F, but the real story is concentration: BAM alone is 71.44% of the public-equity book.
- Learn
CUSIP vs Ticker in 13F Filings
Learn why 13F filings identify securities by CUSIP first, how those IDs map to familiar tickers, and what investors should check before comparing holdings.
- Learn
13F-HR/A Amendments: Restatements vs New Holdings
A practical guide to amended 13F filings, why restatements replace a report, why new-holdings amendments add to it, and how 13F Insight consolidates the view.
- Research
CalSTRS Q1 2026: $94.49B Pension Book
CalSTRS’ Q1 2026 13F shows a $94.49B public-pension equity sleeve led by NVDA, AAPL and MSFT after a -5.5% quarterly pullback.
- Learn
Reading Indirect Ownership on a Form 4: By LLC, Trust, Foundation
Form 4 filings split insider holdings into direct and indirect shares held by LLCs, trusts and foundations. Misreading the indirect lines is a common ownership error.
- Learn
The G Code on Form 4: When Insiders Give Stock Away
The G code on a Form 4 marks a bona fide gift, not a sale. Learn how to read charitable and family stock transfers without mistaking them for insider selling.
- Learn
GRATs on Form 4: Estate Planning That Looks Like Selling
Grantor retained annuity trusts (GRATs) show up on insider Form 4 filings as share transfers that look like disposals but are estate-planning moves, not sales.
- Learn
Soft Dollars: How Funds Pay for Research
Soft dollars are an old, quietly controversial way institutional managers pay for research with their clients' trading commissions instead of their own cash. Here is how the arrangement works and why it shapes the funds behind every 13F.
- Learn
Preferred Stock in 13F Filings: How to Read It
Preferred stock sits between bonds and common shares, and some of it shows up in 13F filings while some does not. Here is how preferred appears in institutional holdings and why it can change what a fund's filing really means.
- Learn
Round-Trip Trades: The 13F Blind Spot Explained
A 13F is a 45-day-old snapshot taken once a quarter, so any position a fund opens and closes within those three months is invisible. Here is what institutional filings miss, and how to read around it.
- Learn
Master-Feeder Funds: The Structure Behind a 13F Filer
Most hedge funds pool money from several feeder funds into one master fund that does all the trading. That master is usually what files the 13F, which is why one filing can represent onshore, offshore, and tax-exempt capital at once.
- Learn
Tender Offers and Going Private, Explained
A tender offer is a direct bid to buy shares from investors at a premium, often the first step in taking a company private and erasing it from the 13F data you track.
- Learn
Wolf Packs: How Activists Swarm a Stock Together
A wolf pack is a loose swarm of activist investors who build stakes in the same target at the same time, concentrating pressure on a board without formally acting as a group that SEC rules would force to file jointly.
- Learn
2-and-20 and High-Water Marks: Hedge Fund Fees
The classic 2-and-20 fee, the carried interest that makes managers rich, the high-water mark that protects investors, and the hurdle rate few funds use — explained for anyone reading 13F data.
- Learn
Poison Pills: How Boards Block Hostile Takeovers
A poison pill, or shareholder rights plan, lets a board make a hostile takeover prohibitively expensive by flooding the market with discounted shares the moment a buyer crosses a set ownership threshold.
- Learn
Why Some Stocks Cost $1,000+: Splits and 13F Reading
A $1,500 share price doesn't make a stock expensive, and a stock split doesn't make you richer. Learn what per-share price means and how splits can distort 13F share counts.
- Learn
Measuring 13F Concentration: Top-Heavy vs Diversified
Two funds can hold the same number of stocks yet run completely different risk profiles. Learn how to measure portfolio concentration from a 13F and why it matters.
- Learn
Why a Fund's 13F AUM Drops: Price Moves vs. Selling
A fund's reported 13F value can fall sharply without the manager selling a single share. Learn how to tell mark-to-market price moves apart from real selling.
- Learn
Turnaround Investing: Betting on the Comeback
Turnaround investing buys a struggling company betting it will recover, offering big rewards if the comeback works and steep losses if it doesn't. Learn what a genuine turnaround requires, why it overlaps deep value and contrarianism, and how to tell a comeback from a falling knife in a 13F.