Costar Group, Inc. short interest
Short interest in Costar Group, Inc. was 18.9 million shares at the 31 August 2026 settlement, up 13.2% on the previous settlement, with 2.51 days to cover at an average daily volume of 7.5 million shares, as reported to FINRA.
| Settlement | Shares short | Change | Average daily volume | Days to cover |
|---|---|---|---|---|
| 31 August 2026 | 18,901,758 | +13.2% | 7,540,322 | 2.51 |
| 14 August 2026 | 16,691,379 | +2.3% | 5,985,190 | 2.79 |
| 31 July 2026 | 16,312,412 | -0.1% | 8,517,346 | 1.92 |
| 15 July 2026 | 16,321,416 | +6.9% | 6,658,994 | 2.45 |
| 30 June 2026 | 15,266,339 | -10.8% | 8,017,139 | 1.90 |
| 15 June 2026 | 17,109,207 | +13.3% | 7,153,302 | 2.39 |
| 29 May 2026 | 15,095,773 | -19.0% | 6,284,254 | 2.40 |
| 15 May 2026 | 18,639,692 | +6.0% | 9,860,000 | 1.89 |
| 30 April 2026 | 17,590,854 | +5.7% | 6,297,831 | 2.79 |
| 15 April 2026 | 16,639,852 | -24.3% | 6,279,015 | 2.65 |
| 31 March 2026 | 21,977,041 | -8.3% | 6,694,747 | 3.28 |
| 13 March 2026 | 23,958,704 | -8.4% | 5,254,595 | 4.56 |
FINRA publishes consolidated short interest twice a month, about ten days after each settlement. Days to cover is shares short over average daily volume. Short interest as a share of the float is not shown: the float is not in the public record.
Source
FINRA equity short interest data, the public dataset.
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