13F and insider trading explainers
Every post includes a publication date and author line. Topic scope is now strictly filings and holdings intelligence.
What Berkshire's latest 13F reveals
Published: 2026-08-18 • Author: IO Innovation
A practical read of concentration, adds, trims, and what changed quarter over quarter.
How to read Form 4 insider trades without overreacting
Published: 2026-08-18 • Author: IO Innovation
Which transaction codes matter, and how to pair them with holdings context.