How to Read Warren Buffett’s 13F

AntsUp Editor2026.07.038 min

A 13F is a quarterly filing in which large U.S. institutional investors disclose their stock holdings. It’s popular because you can glimpse what greats like Buffett bought and sold.

What a 13F tells you

Holdings, share counts, and market values as of quarter-end, plus new buys, increases/decreases, and full exits versus the prior quarter. Useful for reading where a great investor’s attention is heading.

Three limits to watch

Lag — Filed up to 45 days after quarter-end, so they may have already sold.
U.S.-listed stocks mostly — short positions, bonds, and foreign stocks are largely excluded.
No context — it doesn’t say why they bought. It could be one leg of a hedge or a pair trade.

Key — A 13F is a “starting point for ideas,” not an “answer key to copy.” Rather than buying blindly, use it as material to verify for yourself why they might have bought.

How to use it

Take stocks that several greats hold in common, or ones newly increased in size, as candidates — then re-analyze them by your own criteria. Check the quarterly changes in AntsUp’s Guru Portfolios.

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