Short Interest: Measuring the Bears

A short seller borrows shares, sells them today, and hopes to buy them back cheaper later — profiting from a decline. It's a legitimate position with a brutal property: losses are uncapped, because a stock can rise without limit. Every short position is therefore a conviction statement with real skin attached.

Short interest as a percent of float tells you what share of the tradable stock is sold short — mid-single digits is unremarkable; north of 15–20% is a heavily bet-against name. Days-to-cover divides the short position by daily volume: how many days of normal trading the bears would need to exit. High on both means a crowded bear camp with a narrow door.

Sometimes the bears are simply right — heavily shorted companies include plenty of genuinely sick businesses. Sometimes they're wrong and trapped. The number alone doesn't tell you which movie you're in; it tells you the stakes and the crowd size. Pair it with the fundamentals and the rest of this course's signals before reading it as bullish or bearish.

When a heavily shorted stock rises hard, shorts losing money must buy shares to exit — and their buying fuels the rise that's hurting them, forcing more exits. That feedback loop is a short squeeze: spectacular, occasionally famous, and impossible to time reliably. Understand the mechanics so you recognize one; treat 'squeeze hunting' as the lottery ticket it is.

The freshest information is the trend: shorts building into a rising stock means smart, motivated money sees something the price doesn't. Shorts quietly covering after a long decline means the bear thesis is ending. The level describes the camp; the CHANGE describes what the camp just decided. Our engine reads it the same way — as one dated, decaying input.