ShortInterestHistory.com

Learn About Short Interest

Start here for the basics behind the numbers on the site. These pages explain short interest, days to cover, report timing, and how to read the data without turning every move into a story.

What Is Short Interest?

A plain-English definition of short interest and how investors usually read it.

What Is Days to Cover?

How days to cover is calculated and where the ratio can mislead.

How Often Short Interest Updates

Why short interest is useful as a reported series, not a real-time indicator.

Short Interest vs. Short Volume

The difference between open short positioning and short-marked trading flow.

What Rising Short Interest Can Mean

What a rising reported short position may suggest and what it does not prove.

What Falling Short Interest Can Mean

How to think about lower reported short interest without overreading it.

How to Read Short Interest Data

A simple framework for reading the latest figure, the change, and days to cover together.

Why Days to Cover Can Spike

Why the ratio can jump when short interest rises, volume falls, or both happen at once.