Required reading for the insider desk.
The quarter in review
Top Insider Purchases: Q1 2026
The quarter's highest-conviction buys, scored and annotated. Where C-suites put their own capital when the tape said otherwise.
Core field guides
What Is SEC Form 4? A Complete Guide for Investors
Who files it, when it's required, and why every filing lands at InsiderBrief within fifteen minutes of hitting EDGAR.
How to Read Insider Trading Data
A practitioner's guide to the Form 4 table — what matters, what to skip, and the three columns that move first.
Insider Buying vs. Selling: What Each Signal Means
Why purchases carry more signal than sales, and how to read each transaction code in context.
Research & evidence
Does Insider Buying Predict Stock Performance?
Forty years of peer-reviewed evidence — from Seyhun (1986) to Cohen, Malloy & Pomorski — on when the alpha is real.
What Is a Cluster Buy? The Strongest Insider Signal
When two or more insiders buy the same ticker within days, the forward-return distribution shifts. Here's why.
This week on the desk
Rocket Lab Into Q1 Earnings: The $45 Billion Question Behind the $600 Million Business
A $45B market cap on $602M of revenue. A $1.85B backlog and a Neutron debut riding on a single tank. What the May 7 print actually has to prove — and the three things to listen for on the call.
Reference tables
Methodology
Tools & comparisons
Read the live tape
The guides above teach the instrument. The pages below play it — every Form 4 and every PTR, scored within fifteen minutes of filing.