Berkshire Hathaway

13F filings reveal what big funds owned 45 days ago — long-only. Here's how to read them without getting fooled by stale data, missing shorts, or copycat traps.

A practical framework for judging buyback programs: funding source, price discipline, dilution offset, and the signals that separate value-accretive repurchases from financial engineering.

How to read short interest, days-to-cover, and borrow costs as signal — not as a squeeze setup. A framework for what each metric tells you, and what it doesn't.