13F

The quarterly filing revealing what large institutions bought and sold, a lagging window into smart money.

Also known as: Form 13F, Institutional Holdings

What it is

A 13F is a quarterly report that institutional managers overseeing at least the SEC threshold in assets must file, disclosing their U.S. equity long positions. It is due within 45 days of quarter end. It reveals holdings, not shorts or timing.

What it does

13Fs let investors track what prominent funds accumulated or dumped, informing conviction and crowding assessments. New positions can spark momentum when disclosed. It is a research input, not a real-time signal.

The evidence

Disclosure of a marquee fund initiating a large stake has repeatedly triggered follow-on buying in the named stock.

Best for

Any liquid U.S. equity followed by institutions.

Pairs well with

form-4, 8-k, thematic-etf

Use cautiously with

The data is up to 45 days stale and omits shorts and options context, so blindly copying it can be dangerous.

Cautions

Positions may already be exited by the time you read the filing.