OMER Short Interest
OMER short interest was 15.94 million shares as of 2026-05-15, a change of +150,501 shares from the prior report date of 2026-04-30.
Based on average trading volume of 1.47 million OMER shares, Omeros’s latest days-to-cover reading was 10.84 days.
OMER short interest summary
- Latest report date: 2026-05-15
- Shares short: 15.94 million
- Change from prior report: +150,501
- Average trading volume: 1.47 million
- Days to cover: 10.84
Omeros Short Interest Chart
The chart below shows OMER short interest over time, with each point representing a reported short-interest measurement date. Hover over a data point to see shares short and days-to-cover details for that report date.
Short interest for Omeros (OMER) is measured twice monthly. The data table below the chart lists each report date, days to cover, average trading volume, shares short, and change from the prior report.
OMER Short Interest Data Table
The table below lists OMER short interest by report date. Days to cover compares total shares short with average trading volume. A positive change means shares short increased from the prior report, while a negative change means shares short decreased.
| Date | Days to cover | Average trading volume | Shares short | Change |
|---|---|---|---|---|
| 2026-05-15 | 10.84 | 1,470,074 | 15,940,028 | +150,501 |
| 2026-04-30 | 13.09 | 1,206,519 | 15,789,527 | -1,110,746 |
| 2026-04-15 | 11.43 | 1,478,463 | 16,900,273 | -169,529 |
| 2026-03-31 | 18.78 | 908,718 | 17,069,802 | -242,326 |
| 2026-03-13 | 22.18 | 780,372 | 17,312,128 | +22,508 |
| 2026-02-27 | 21.18 | 816,280 | 17,289,620 | -669,576 |
| 2026-02-13 | 17.68 | 1,015,590 | 17,959,196 | +297,298 |
| 2026-01-30 | 10.44 | 1,692,353 | 17,661,898 | +1,232,758 |
| 2026-01-15 | 4.67 | 3,516,886 | 16,429,140 | +3,181,955 |
| 2025-12-31 | 2.60 | 5,093,923 | 13,247,185 | -672,449 |
| 2025-12-15 | 9.47 | 1,470,045 | 13,919,634 | +569,613 |
| 2025-11-28 | 7.80 | 1,711,959 | 13,350,021 | -3,477 |
| 2025-11-14 | 7.79 | 1,715,015 | 13,353,498 | +1,198,417 |
| 2025-10-31 | 4.20 | 2,896,541 | 12,155,081 | -736,347 |
| 2025-10-15 | 1.06 | 12,206,313 | 12,891,428 | +231,299 |
| 2025-09-15 | 20.33 | 663,928 | 13,500,482 | +355,934 |
| 2025-08-29 | 13.16 | 998,983 | 13,144,548 | -250,043 |
| 2025-08-15 | 11.40 | 1,175,371 | 13,394,591 | +611,113 |
| 2025-07-31 | 7.50 | 1,704,333 | 12,783,478 | -813,581 |
| 2025-07-15 | 14.33 | 948,779 | 13,597,059 | +76,507 |
| 2025-06-30 | 14.02 | 964,263 | 13,520,552 | +425,230 |
| 2025-06-13 | 15.65 | 836,667 | 13,095,322 | +852,510 |
| 2025-05-30 | 10.48 | 1,168,397 | 12,242,812 | +1,531,075 |
| 2025-05-15 | 6.83 | 1,569,275 | 10,711,737 | +1,543,793 |
| 2025-04-30 | 20.82 | 440,250 | 9,167,944 | -1,538,432 |
| 2025-04-15 | 8.88 | 1,206,319 | 10,706,376 | +1,379,798 |
| 2025-03-31 | 18.71 | 498,567 | 9,326,578 | -174,623 |
| 2025-03-14 | 18.25 | 520,589 | 9,501,201 | +275,425 |
| 2025-02-28 | 16.26 | 567,315 | 9,225,776 | -225,490 |
| 2025-02-14 | 23.27 | 406,084 | 9,451,266 | +88,329 |
| 2025-01-31 | 20.18 | 464,079 | 9,362,937 | +89,086 |
| 2025-01-15 | 14.19 | 653,327 | 9,273,851 | +836,662 |
| 2024-12-31 | 6.00 | 1,407,263 | 8,437,189 | +147,550 |
| 2024-12-13 | 11.01 | 752,971 | 8,289,639 | -628,901 |
| 2024-11-29 | 5.88 | 1,516,889 | 8,918,540 | -1,806,559 |
| 2024-11-15 | 6.26 | 1,712,606 | 10,725,099 | -1,253,723 |
| 2024-10-31 | 63.89 | 187,490 | 11,978,822 | -139,210 |
| 2024-10-15 | 56.90 | 212,972 | 12,118,032 | +188,612 |
| 2024-09-30 | 47.64 | 250,394 | 11,929,420 | +87,188 |
| 2024-09-13 | 43.78 | 270,509 | 11,842,232 | +264,842 |
| 2024-08-30 | 49.70 | 232,956 | 11,577,390 | -110,312 |
| 2024-08-15 | 24.30 | 481,061 | 11,687,702 | -628,481 |
| 2024-07-31 | 28.77 | 428,128 | 12,316,183 | -567,825 |
| 2024-07-15 | 54.63 | 235,839 | 12,884,008 | +50,919 |
| 2024-06-28 | 37.67 | 340,668 | 12,833,089 | -403,312 |
| 2024-06-14 | 26.40 | 501,406 | 13,236,401 | +188,503 |
| 2024-05-31 | 40.38 | 323,115 | 13,047,898 | -493,734 |
| 2024-05-15 | 57.34 | 236,157 | 13,541,632 | -28,591 |
| 2024-04-30 | 52.51 | 258,429 | 13,570,223 | +437,670 |
| 2024-04-15 | 26.62 | 493,315 | 13,132,553 | -154,039 |
| 2024-03-28 | 41.03 | 323,791 | 13,286,592 | -314,262 |
| 2024-03-15 | 28.41 | 478,707 | 13,600,854 | -220,410 |
| 2024-02-29 | 25.90 | 533,632 | 13,821,264 | -10,098 |
| 2024-02-15 | 19.03 | 726,902 | 13,831,362 | +145,248 |
| 2024-01-31 | 20.15 | 679,375 | 13,686,114 | -131,094 |
| 2024-01-12 | 19.54 | 706,998 | 13,817,208 | +856,316 |
| 2023-12-29 | 16.20 | 800,217 | 12,960,892 | +93,041 |
| 2023-12-15 | 15.11 | 851,684 | 12,867,851 | -13,799 |
| 2023-11-30 | 18.42 | 699,339 | 12,881,650 | +154,636 |
| 2023-11-15 | 20.74 | 613,754 | 12,727,014 | -131,269 |
| 2023-10-31 | 9.13 | 1,407,953 | 12,858,283 | -285,574 |
| 2023-10-13 | 23.27 | 564,864 | 13,143,857 | +177,539 |
| 2023-09-29 | 27.94 | 464,137 | 12,966,318 | +864,208 |
| 2023-09-15 | 32.87 | 368,131 | 12,102,110 | -2,895 |
| 2023-08-31 | 32.54 | 371,951 | 12,105,005 | +512,359 |
| 2023-08-15 | 26.88 | 431,261 | 11,592,646 | +222,836 |
| 2023-07-31 | 21.95 | 518,014 | 11,369,810 | -200,472 |
| 2023-07-14 | 37.78 | 306,245 | 11,570,282 | +50,361 |
| 2023-06-30 | 7.94 | 1,450,676 | 11,519,921 | +1,737,713 |
| 2023-06-15 | 15.10 | 647,886 | 9,782,208 | +593,953 |
| 2023-05-31 | 15.36 | 598,312 | 9,188,255 | +108,118 |
| 2023-05-15 | 19.40 | 467,990 | 9,080,137 | -326,341 |
| 2023-04-28 | 15.55 | 605,014 | 9,406,478 | +391,457 |
| 2023-04-14 | 17.53 | 514,208 | 9,015,021 | +95,174 |
| 2023-03-31 | 27.91 | 319,583 | 8,919,847 | +480,000 |
| 2023-03-15 | 23.85 | 353,900 | 8,439,847 | +682,894 |
| 2023-02-28 | 18.99 | 408,369 | 7,756,953 | +295,559 |
| 2023-02-15 | 2.15 | 3,464,612 | 7,461,394 | -1,104,711 |
| 2023-01-31 | 24.35 | 351,725 | 8,566,105 | +44,195 |
| 2023-01-13 | 22.24 | 383,209 | 8,521,910 | -223,169 |
| 2022-12-30 | 8.08 | 1,081,702 | 8,745,079 | +134,893 |
| 2022-12-15 | 17.61 | 489,063 | 8,610,186 | -589,582 |
| 2022-11-30 | 16.90 | 544,513 | 9,199,768 | +361,746 |
| 2022-11-15 | 20.02 | 441,430 | 8,838,022 | -183,287 |
| 2022-10-31 | 33.26 | 271,261 | 9,021,309 | -255,706 |
| 2022-10-14 | 25.39 | 365,416 | 9,277,015 | -143,075 |
| 2022-09-30 | 19.33 | 487,357 | 9,420,090 | -59,510 |
| 2022-09-15 | 16.44 | 576,462 | 9,479,600 | -475,832 |
| 2022-08-31 | 15.42 | 645,464 | 9,955,432 | -399,099 |
| 2022-08-15 | 13.73 | 754,428 | 10,354,531 | -1,265,761 |
| 2022-07-29 | 15.94 | 728,793 | 11,620,292 | -512,112 |
| 2022-07-15 | 4.02 | 3,019,054 | 12,132,404 | -267,112 |
| 2022-06-30 | 5.94 | 2,087,200 | 12,399,516 | -891,474 |
| 2022-06-15 | 11.31 | 1,175,614 | 13,290,990 | +202,870 |
| 2022-05-31 | 11.59 | 1,129,110 | 13,088,120 | +863,089 |
| 2022-05-13 | 10.83 | 1,128,808 | 12,225,031 | +952,095 |
| 2022-04-29 | 16.08 | 701,130 | 11,272,936 | +118,003 |
| 2022-04-14 | 22.10 | 504,742 | 11,154,933 | -42,932 |
| 2022-03-31 | 25.02 | 447,533 | 11,197,865 | -275,726 |
| 2022-03-15 | 17.73 | 646,999 | 11,473,591 | +54,153 |
| 2022-02-28 | 26.37 | 433,047 | 11,419,438 | -356,742 |
| 2022-02-15 | 20.43 | 576,519 | 11,776,180 | +451,846 |
| 2022-01-31 | 13.36 | 847,934 | 11,324,334 | +373,175 |
| 2022-01-14 | 18.53 | 591,047 | 10,951,159 | +22,569 |
| 2021-12-31 | 13.02 | 839,552 | 10,928,590 | -83,488 |
| 2021-12-15 | 4.27 | 2,578,978 | 11,012,078 | -744,913 |
| 2021-11-30 | 20.07 | 585,688 | 11,756,991 | +273,439 |
| 2021-11-15 | 12.68 | 905,744 | 11,483,552 | -268,481 |
| 2021-10-29 | 5.11 | 2,298,206 | 11,752,033 | +420,287 |
| 2021-10-15 | 4.24 | 2,671,432 | 11,331,746 | +1,454,165 |
| 2021-09-30 | 17.78 | 555,607 | 9,877,581 | -506,697 |
| 2021-09-15 | 26.42 | 393,074 | 10,384,278 | -352,970 |
| 2021-08-31 | 28.89 | 371,616 | 10,737,248 | -481,746 |
| 2021-08-13 | 24.25 | 462,545 | 11,218,994 | +197,548 |
| 2021-07-30 | 37.69 | 292,436 | 11,021,446 | -306,334 |
| 2021-07-15 | 25.50 | 444,268 | 11,327,780 | -582,959 |
| 2021-06-30 | 23.90 | 498,322 | 11,910,739 | -310,023 |
| 2021-06-15 | 25.77 | 474,248 | 12,220,762 | +51,173 |
OMER Short Interest FAQ
What is the OMER short interest?
I am following Omeros Corporation Common Stoc..., under stock symbol OMER, and I would like to know what their short interest looks like?
I am following Omeros Corporation Common Stoc..., under stock symbol OMER, and I would like to know what their short interest looks like?
✓Accepted answer:
In our historical short interest database, the most recent data for OMER as of 2026-05-15 shows total short interest of 15,940,028 shares. That represents a change of +150,501 from the prior data on 2026-04-30. Based on OMER's average trading volume of 1,470,074 shares, this level of short interest works out to a days-to-cover value of 10.84 days.
Suggested answer:
If you are referring to OMER traded on NNM (company name Omeros Corporation Common Stoc...), you are probably looking for either the number of shares short (15,940,028) or the "days to cover" information (approximately how many trading days it would take to cover all outstanding short interest if current average trading volumes are sustained) which is 10.84, with this OMER short interest information being as of 2026-05-15.
Suggested answer:
The most recent OMER short interest data was reported for 2026-05-15 and showed a change of +150,501 shares short for Omeros Corporation Common Stoc....
What is the OMER historical short interest level?
Going back in time for OMER, what has the short interest been for Omeros Corporation Common Stoc...?
Going back in time for OMER, what has the short interest been for Omeros Corporation Common Stoc...?
✓Accepted answer:
The best way to represent the historical short interest for Omeros Corporation Common Stoc... is by presenting a full chart and table of the data, which you will find on this page. Hover your mouse over any of the points on the chart to see more information, or refer to the full data table below the chart, showing the date, days to cover ratio, average trading volume, total short interest, and change in total short interest period over period.
