VRTX · Vertex Pharmaceuticals Inc / Ma
Total shares sold short and not yet covered, reported to FINRA by broker-dealers twice a month. Each reading settles on the 15th and the last business day of the month and is published seven business days later — the next scheduled dates are listed at the top of the table. Days to cover divides the short position by average daily volume; a high value (above 5) can signal short-squeeze potential.
Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-07-15). Weighted mean of the available factors (short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, fails-to-deliver 10%) plus catalyst boosts (price spike, volume surge, earnings within days), capped at +20 and clamped to 100.
Short Interest History
| Settlement Date | Current Position | Previous Position | Change | Days to Cover |
|---|---|---|---|---|
|
2026-08-14
Scheduled
FINRA publishes Aug 25
|
— | — | — | — |
|
2026-07-31
Scheduled
FINRA publishes Aug 11
|
— | — | — | — |
| 2026-07-15 | 4,986,691 | 4,938,472 | +48,219 | 3.10 |
| 2026-06-30 | 4,938,472 | 4,616,968 | +321,504 | 2.01 |
| 2026-06-15 | 4,616,968 | 4,491,490 | +125,478 | 3.82 |
| 2026-05-29 | 4,491,490 | 4,461,773 | +29,717 | 3.19 |
| 2026-05-15 | 4,461,773 | 4,172,829 | +288,944 | 3.64 |
| 2026-04-30 | 4,172,829 | 4,336,502 | -163,673 | 4.31 |
| 2026-04-15 | 4,336,502 | 4,021,854 | +314,648 | 3.78 |
| 2026-03-31 | 4,021,854 | 4,127,429 | -105,575 | 2.69 |
| 2026-03-13 | 4,127,429 | 4,433,365 | -305,936 | 2.85 |
| 2026-02-27 | 4,433,365 | 4,466,182 | -32,817 | 3.51 |
| 2026-02-13 | 4,466,182 | 4,422,490 | +43,692 | 2.66 |
| 2026-01-30 | 4,422,490 | 4,423,965 | -1,475 | 2.79 |
| 2026-01-15 | 4,423,965 | 5,022,282 | -598,317 | 3.08 |
| 2025-12-31 | 5,022,282 | 4,287,121 | +735,161 | 4.09 |
| 2025-12-15 | 4,287,121 | 4,455,217 | -168,096 | 3.15 |
| 2025-11-28 | 4,455,217 | 4,006,159 | +449,058 | 3.20 |
| 2025-11-14 | 4,006,159 | 4,131,677 | -125,518 | 2.68 |
| 2025-10-31 | 4,131,677 | 3,555,766 | +575,911 | 3.22 |
| 2025-10-15 | 3,555,766 | 3,557,058 | -1,292 | 2.65 |
| 2025-09-30 | 3,557,058 | 4,053,668 | -496,610 | 1.75 |
| 2025-09-15 | 4,053,668 | 3,639,292 | +414,376 | 3.17 |
| 2025-08-29 | 3,639,292 | 3,700,693 | -61,401 | 2.32 |
| 2025-08-15 | 3,700,693 | 4,362,540 | -661,847 | 1.11 |
| 2025-07-31 | 4,362,540 | 4,188,160 | +174,380 | 3.90 |