Updated May 23, 2026 · 2187 articles
Insights
Research, news and field guides on institutional positioning. Powered by real SEC filings — 13F, 13D/G, Form 4.
Why Most Large 13Fs Own the Same Megacaps
Nvidia, Microsoft, Apple, Alphabet anchor book after book across very different managers. Here's why large 13Fs cluster in megacaps — and what the exceptions reveal.
Marcus ChenHow to Read an ESG Fund's 13F Holdings
ESG and responsible funds screen stocks on values as well as returns. Here's how that screening shapes a 13F — and what the filing can and can't tell you.
Sarah MitchellWhat Is Quality Investing? How to Read a Quality 13F
Quality investors own durable, profitable businesses and hold them for years. Here's what quality investing means and how to recognize a quality 13F.
Sarah MitchellFirst Manhattan Q1 2026: 30% in Berkshire Hathaway
First Manhattan, the value firm tied to Buffett associate Sandy Gottesman, holds ~30% of its $36B book in Berkshire Hathaway and added 53% to Amazon in Q1 2026.
Marcus ChenParnassus Q1 2026: A Broad Trim Across a Quality Book
Parnassus, the ESG-investing pioneer, trimmed nearly every top holding 6-8% (Deere -29%) in Q1 2026 — a broad de-risking as its book fell to $34B.
Marcus ChenGMO Q1 2026: Grantham's Quality Megacap Book
GMO added Microsoft to its top spot and trimmed Lam Research in Q1 2026 — a quality book of profitable megacaps and healthcare defensives despite cautious commentary.
Marcus ChenKayne Anderson Rudnick Q1 2026: A Non-Megacap Book
Kayne Anderson Rudnick's $34B book holds quality small- and mid-caps — Jack Henry, Toro, Teledyne — and no megacaps. Its value has slid as small-caps lag.
Marcus ChenViking Global Q1 2026: Big Adds to Visa and Tesla
Viking Global raised Visa 59% to its top holding, lifted Tesla 47%, and opened a new Apple stake in Q1 2026 — a Tiger cub leaning into payments and megacap tech.
Marcus ChenTCI Q1 2026: Chris Hohn's 10-Stock, GE-Anchored Book
TCI Fund Management holds just ten stocks, with GE Aerospace at 30%. In Q1 2026 it added to its quality compounders and slashed Microsoft 84%.
Marcus ChenBeyond Chips: Spotting the AI-Power Trade in 13Fs
Institutions are broadening the AI trade from chips into power and infrastructure. Here's how to spot the AI-power chain in 13F filings, with real examples.
Marcus ChenNew, Add, Trim, Exit: Reading 13F Position Changes
A 13F's 'bought' and 'sold' hide four very different moves. Here's how to read new positions, adds, trims, and exits — and which carry the most signal.
Sarah MitchellLow Turnover: What a Mostly-Flat 13F Is Telling You
When a fund holds its positions flat and the value still drops, that's market beta, not selling. Here's how to read low turnover and 'held roughly flat' 13Fs.
Sarah MitchellQuant vs Discretionary Funds: How to Tell Them Apart in a 13F
A quant fund and a discretionary fund can own the same stocks but mean very different things by it. Here's how to tell them apart from a 13F — and why it matters.
Marcus ChenMan Group Q1 2026: Rotating Within the Megacaps
The world's largest listed hedge fund added Microsoft and Eli Lilly while trimming Amazon and Nvidia in Q1 2026 — a measured rotation within its megacap book.
Marcus ChenFederated Hermes Q1 2026: Buying AI and the Power Grid
Federated Hermes added to AI chips (Nvidia, Broadcom) and the power behind them (GE Vernova +22%, Chevron) in Q1 2026 — buying the full AI-infrastructure chain.
Marcus ChenRenaissance Technologies Q1 2026: A Quant Book's Breadth
Renaissance's 13F holds just 14% in its top 10 and 86% in a long tail — a model-driven quant book. Q1 2026 moves like Nvidia +190% are signal rebalancing.
Marcus ChenLazard Q1 2026: Adding Across Tech and Infrastructure
Lazard broadly added in Q1 2026 — Nvidia +23%, American Tower +20%, Crown Castle +16% — barbelling AI growth with rate-sensitive infrastructure REITs.
Marcus ChenLoomis Sayles Q1 2026: A Concentrated Megacap-Growth Book
Loomis Sayles held nearly 10% of its $74.33B book in Nvidia and 38% in six megacap-growth leaders through a down quarter — growth conviction held flat.
Marcus ChenHarris Associates Q1 2026: Oakmark's Big Salesforce Add
Oakmark's Harris Associates lifted Salesforce 52% to its top holding in Q1 2026 while trimming energy — a value manager underwriting large-cap software.
Marcus ChenHow to Read a Fund's Sector Tilt From Its 13F
A fund's sector tilt — where it overweights the market — is a compact summary of its style and bets. Here's how to spot one from the holdings, with real examples.
Marcus Chen