GLOSSARY // Market Structure
Days to Cover
Days to cover is short interest divided by average daily trading volume — the number of typical trading days it would take every short seller to buy back their position. Ten million shares short in a stock that trades two million shares a day is 5 days to cover.
The ratio measures how crowded the exit is. Short interest alone says how big the short bet is; days to cover says how hard it is to unwind. A stock can carry 25% short interest but trade so actively that shorts can cover in a single session, while a sleepy name with 8 days to cover can squeeze violently on modest buying.
Readings above 5 are commonly treated as elevated, and above 10 as squeeze-prone. The number shifts fast when volume expands: the same short position over triple the volume cuts days to cover to a third.
TUV has 12,000,000 shares short and averages 1,500,000 shares of daily volume: 12,000,000 / 1,500,000 = 8 days to cover. A catalyst triples volume to 4,500,000 shares a day, dropping the ratio to 2.7 — but the first two of those days were shorts covering, which is exactly what drove the stock up 40%.
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Educational only — not financial advice. Definitions simplified for clarity; markets are messier than definitions.