Vertex Pharmaceuticals Inc. / MA short interest
Short interest in Vertex Pharmaceuticals Inc. / MA was 4.7 million shares at the 31 August 2026 settlement, up 12.4% on the previous settlement, with 4.51 days to cover at an average daily volume of 1.0 million shares, as reported to FINRA.
| Settlement | Shares short | Change | Average daily volume | Days to cover |
|---|---|---|---|---|
| 31 August 2026 | 4,659,749 | +12.4% | 1,032,621 | 4.51 |
| 14 August 2026 | 4,146,973 | +5.2% | 1,343,908 | 3.09 |
| 31 July 2026 | 3,942,936 | -20.9% | 1,318,061 | 2.99 |
| 15 July 2026 | 4,986,691 | +1.0% | 1,607,817 | 3.10 |
| 30 June 2026 | 4,938,472 | +7.0% | 2,454,849 | 2.01 |
| 15 June 2026 | 4,616,968 | +2.8% | 1,209,855 | 3.82 |
| 29 May 2026 | 4,491,490 | +0.7% | 1,406,784 | 3.19 |
| 15 May 2026 | 4,461,773 | +6.9% | 1,224,873 | 3.64 |
| 30 April 2026 | 4,172,829 | -3.8% | 967,590 | 4.31 |
| 15 April 2026 | 4,336,502 | +7.8% | 1,147,800 | 3.78 |
| 31 March 2026 | 4,021,854 | -2.6% | 1,493,484 | 2.69 |
| 13 March 2026 | 4,127,429 | -6.9% | 1,448,625 | 2.85 |
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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