Omeros (OMER)
Omeros on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as pharmaceutical preparations.
11.4M
Short interest
settlement 2026-10-15
12.2
Days to cover
+5.2 days vs prior
64.6%
Short share of volume
2026-11-02
18,060
Fails to deliver
settlement 2026-10-14
Thu 12 Nov
Next earnings
estimated date
-$2.2M
Insider flow, 90 days
0 buys, 11 sells
As of 2026-11-02.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in OMER is 11,428,767 shares, down 1,062,809 shares over the last month. Over the last 48 readings it ranged from 8,289,639 shares (13 December 2024) to 18,103,605 shares (15 June 2026). At the reported average volume of 939K shares a day that is 12.2 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/omer" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 11,428,767 | +0.4% | 939,029 | 12.17 |
| 2026-09-30 | 11,382,531 | -8.9% | 1,638,478 | 6.95 |
| 2026-09-15 | 12,491,576 | -2.1% | 1,341,022 | 9.31 |
| 2026-08-31 | 12,758,406 | -12.8% | 1,747,098 | 7.30 |
| 2026-08-14 | 14,639,133 | -5.1% | 2,981,819 | 4.91 |
| 2026-07-31 | 15,420,416 | +2.2% | 1,561,802 | 9.87 |
| 2026-07-15 | 15,092,070 | -0.3% | 1,273,680 | 11.85 |
| 2026-06-30 | 15,136,140 | -16.4% | 2,695,791 | 5.61 |
| 2026-06-15 | 18,103,605 | +11.3% | 2,145,416 | 8.44 |
| 2026-05-29 | 16,271,790 | +2.1% | 1,798,109 | 9.05 |
| 2026-05-15 | 15,940,028 | +0.9% | 1,470,074 | 10.84 |
| 2026-04-30 | 15,789,527 | -6.6% | 1,206,519 | 13.09 |
| 2026-04-15 | 16,900,273 | -1.0% | 1,478,463 | 11.43 |
| 2026-03-31 | 17,069,802 | -1.4% | 908,718 | 18.78 |
| 2026-03-13 | 17,312,128 | +0.1% | 780,372 | 22.18 |
| 2026-02-27 | 17,289,620 | -3.7% | 816,280 | 21.18 |
| 2026-02-13 | 17,959,196 | +1.7% | 1,015,590 | 17.68 |
| 2026-01-30 | 17,661,898 | +7.5% | 1,692,353 | 10.44 |
| 2026-01-15 | 16,429,140 | +24.0% | 3,516,886 | 4.67 |
| 2025-12-31 | 13,247,185 | -4.8% | 5,093,923 | 2.60 |
| 2025-12-15 | 13,919,634 | +4.3% | 1,470,045 | 9.47 |
| 2025-11-28 | 13,350,021 | -0.0% | 1,711,959 | 7.80 |
| 2025-11-14 | 13,353,498 | +9.9% | 1,715,015 | 7.79 |
| 2025-10-31 | 12,155,081 | -5.7% | 2,896,541 | 4.20 |
| 2025-10-15 | 12,891,428 | +1.8% | 12,206,313 | 1.06 |
| 2025-09-30 | 12,660,129 | -6.2% | 1,022,800 | 12.38 |
| 2025-09-15 | 13,500,482 | +2.7% | 663,928 | 20.33 |
| 2025-08-29 | 13,144,548 | -1.9% | 998,983 | 13.16 |
| 2025-08-15 | 13,394,591 | +4.8% | 1,175,371 | 11.40 |
| 2025-07-31 | 12,783,478 | -6.0% | 1,704,333 | 7.50 |
| 2025-07-15 | 13,597,059 | +0.6% | 948,779 | 14.33 |
| 2025-06-30 | 13,520,552 | +3.3% | 964,263 | 14.02 |
| 2025-06-13 | 13,095,322 | +7.0% | 836,667 | 15.65 |
| 2025-05-30 | 12,242,812 | +14.3% | 1,168,397 | 10.48 |
| 2025-05-15 | 10,711,737 | +16.8% | 1,569,275 | 6.83 |
| 2025-04-30 | 9,167,944 | -14.4% | 440,250 | 20.82 |
| 2025-04-15 | 10,706,376 | +14.8% | 1,206,319 | 8.88 |
| 2025-03-31 | 9,326,578 | -1.8% | 498,567 | 18.71 |
| 2025-03-14 | 9,501,201 | +3.0% | 520,589 | 18.25 |
| 2025-02-28 | 9,225,776 | -2.4% | 567,315 | 16.26 |
| 2025-02-14 | 9,451,266 | +0.9% | 406,084 | 23.27 |
| 2025-01-31 | 9,362,937 | +1.0% | 464,079 | 20.18 |
| 2025-01-15 | 9,273,851 | +9.9% | 653,327 | 14.19 |
| 2024-12-31 | 8,437,189 | +1.8% | 1,407,263 | 6.00 |
| 2024-12-13 | 8,289,639 | -7.0% | 752,971 | 11.01 |
| 2024-11-29 | 8,918,540 | -16.8% | 1,516,889 | 5.88 |
| 2024-11-15 | 10,725,099 | -10.5% | 1,712,606 | 6.26 |
| 2024-10-31 | 11,978,822 | -1.1% | 187,490 | 63.89 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of OMER volume is 64.6%, down 3.5 points over the last five sessions. Over the last 30 readings it ranged from 43.9% (22 September 2026) to 69.0% (14 October 2026). The latest reading is 4.5 points above the 30-session average of 60.1%, on 307K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 198K | 307K | 64.6% | 0 |
| 2026-10-30 | 171K | 294K | 58.2% | 0 |
| 2026-10-29 | 389K | 580K | 67.1% | 100 |
| 2026-10-28 | 137K | 207K | 66.0% | 12 |
| 2026-10-27 | 183K | 301K | 60.8% | 1 |
| 2026-10-26 | 118K | 173K | 68.1% | 6 |
| 2026-10-23 | 131K | 209K | 62.7% | 1,774 |
| 2026-10-22 | 144K | 237K | 60.6% | 0 |
| 2026-10-21 | 170K | 263K | 64.8% | 0 |
| 2026-10-20 | 135K | 211K | 64.3% | 0 |
| 2026-10-19 | 361K | 524K | 69.0% | 5,618 |
| 2026-10-16 | 997K | 1.7M | 60.1% | 77,304 |
| 2026-10-15 | 219K | 370K | 59.2% | 304 |
| 2026-10-14 | 237K | 344K | 69.0% | 300 |
| 2026-10-13 | 176K | 340K | 51.6% | 1,218 |
| 2026-10-12 | 245K | 442K | 55.4% | 2,166 |
| 2026-10-09 | 172K | 299K | 57.4% | 321 |
| 2026-10-08 | 190K | 324K | 58.6% | 632 |
| 2026-10-07 | 130K | 220K | 59.0% | 400 |
| 2026-10-06 | 229K | 377K | 60.9% | 0 |
| 2026-10-05 | 146K | 234K | 62.5% | 400 |
| 2026-10-02 | 195K | 344K | 56.6% | 0 |
| 2026-10-01 | 176K | 375K | 46.9% | 0 |
| 2026-09-30 | 225K | 373K | 60.4% | 0 |
| 2026-09-29 | 177K | 281K | 63.0% | 1,316 |
| 2026-09-28 | 169K | 360K | 46.8% | 307 |
| 2026-09-25 | 219K | 419K | 52.3% | 1,800 |
| 2026-09-24 | 220K | 337K | 65.3% | 1,166 |
| 2026-09-23 | 324K | 482K | 67.4% | 1,785 |
| 2026-09-22 | 698K | 1.6M | 43.9% | 21,347 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 14 October 2026, the fails-to-deliver balance in OMER is 18,060 shares, up 10,772 shares over the last settlement date. Over the last 30 readings it ranged from 5 shares (1 September 2026) to 129,082 shares (14 August 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-14 | 18,060 | $18.88 | $341K |
| 2026-10-13 | 7,288 | $19.63 | $143K |
| 2026-10-09 | 20 | $19.12 | $382 |
| 2026-10-08 | 9 | $18.75 | $169 |
| 2026-10-05 | 8 | $18.61 | $149 |
| 2026-10-02 | 8 | $18.47 | $148 |
| 2026-09-24 | 49,710 | $20.74 | $1.0M |
| 2026-09-21 | 39,795 | $17.87 | $711K |
| 2026-09-17 | 21 | $17.34 | $364 |
| 2026-09-15 | 19 | $17.46 | $332 |
| 2026-09-04 | 62 | $19.11 | $1K |
| 2026-09-01 | 5 | $18.79 | $94 |
| 2026-08-31 | 481 | $18.61 | $9K |
| 2026-08-26 | 19,900 | $19.28 | $384K |
| 2026-08-24 | 11,566 | $19.27 | $223K |
| 2026-08-19 | 42,091 | $17.19 | $724K |
| 2026-08-17 | 17,443 | $17.19 | $300K |
| 2026-08-14 | 129,082 | $17.35 | $2.2M |
| 2026-08-13 | 21,705 | $13.71 | $298K |
| 2026-08-10 | 5,531 | $13.25 | $73K |
| 2026-08-06 | 7,874 | $12.65 | $100K |
| 2026-08-03 | 16,574 | $11.84 | $196K |
| 2026-07-30 | 27,774 | $11.67 | $324K |
| 2026-07-29 | 18,735 | $11.28 | $211K |
| 2026-07-28 | 48,776 | $11.34 | $553K |
| 2026-07-24 | 106,506 | $10.28 | $1.1M |
| 2026-07-23 | 6,110 | $9.84 | $60K |
| 2026-07-22 | 28,203 | $9.53 | $269K |
| 2026-07-20 | 417 | $9.69 | $4K |
| 2026-07-17 | 1,379 | $9.22 | $13K |
Insider trades
SEC Form 4, newest first. JSONInsiders at OMER reported 11 open-market sells worth $2.2M in the last 90 days and no open-market buys. Latest filing: Borges David J. (VP, Finance & CAO) on 2026-09-23.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-23 | Borges David J. | VP, Finance & CAO | Sell | 10K | $20.95 | $210K | 0 |
| 2026-09-23 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 10K | $15.58 | $156K | 10K |
| 2026-09-22 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 5K | $2.94 | $15K | 10K |
| 2026-09-22 | Borges David J. | VP, Finance & CAO | Sell | 10K | $20.95 | $210K | 0 |
| 2026-09-22 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 5K | $3.93 | $20K | 5K |
| 2026-08-31 | Cancelmo Peter B | VP, General Counsel | Sell | 25K | $18.54 | $464K | 200 |
| 2026-08-31 | Cancelmo Peter B | VP, General Counsel | Exercise or conversion | 25K | $2.94 | $74K | 25K |
| 2026-08-28 | Cancelmo Peter B | VP, General Counsel | Sell | 25K | $18.65 | $466K | 200 |
| 2026-08-28 | Cancelmo Peter B | VP, General Counsel | Exercise or conversion | 25K | $2.94 | $74K | 25K |
| 2026-08-27 | HANISH ARNOLD C | Director | Sell | 5K | $19.02 | $95K | 0 |
| 2026-08-27 | HANISH ARNOLD C | Director | Sell | 5K | $18.88 | $94K | 5K |
| 2026-08-27 | HANISH ARNOLD C | Director | Exercise or conversion | 8K | $14.66 | $110K | 10K |
| 2026-08-27 | HANISH ARNOLD C | Director | Exercise or conversion | 3K | $15.81 | $40K | 3K |
| 2026-08-26 | HANISH ARNOLD C | Director | Sell | 5K | $18.53 | $93K | 0 |
| 2026-08-26 | HANISH ARNOLD C | Director | Exercise or conversion | 5K | $15.81 | $79K | 5K |
| 2026-08-24 | Borges David J. | VP, Finance & CAO | Sell | 906 | $19.10 | $17K | 0 |
| 2026-08-24 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 906 | $2.94 | $3K | 906 |
| 2026-08-21 | Borges David J. | VP, Finance & CAO | Sell | 10K | $18.95 | $190K | 0 |
| 2026-08-21 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 4K | $2.94 | $12K | 10K |
| 2026-08-21 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 6K | $3.93 | $23K | 6K |
| 2026-08-20 | Cable Thomas J. | Director | Exercise or conversion | 8K | $3.93 | $29K | 50K |
| 2026-08-20 | Cable Thomas J. | Director | Sell | 15K | $18.45 | $277K | 35K |
| 2026-08-20 | Cable Thomas J. | Director | Exercise or conversion | 8K | $2.00 | $15K | 43K |
| 2026-08-13 | Borges David J. | VP, Finance & CAO | Sell | 5K | $16.95 | $85K | 0 |
| 2026-08-13 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 5K | $3.93 | $20K | 5K |
| 2026-05-22 | Cable Thomas J. | Director | Sell | 8K | $11.61 | $87K | 35K |
| 2026-05-22 | Cable Thomas J. | Director | Exercise or conversion | 8K | $10.84 | $81K | 43K |
| 2026-02-18 | Demopulos Gregory A MD | Chairman, CEO & President | Tax withholding | 358K | $11.93 | $4.3M | 1.5M |
| 2026-02-18 | Demopulos Gregory A MD | Chairman, CEO & President | Exercise or conversion | 400K | $10.27 | $4.1M | 1.8M |
| 2026-01-13 | Borges David J. | VP, Finance & CAO | Sell | 30K | $12.31 | $369K | 0 |
| 2026-01-13 | Borges David J. | VP, Finance & CAO | Exercise or conversion | 30K | $3.06 | $92K | 30K |
| 2026-01-12 | Borges David J. | VP, Finance & CAO | Sell | 30K | $12.72 | $382K | 0 |
| 2025-10-13 | Demopulos Gregory A MD | Chairman, CEO & President | Gift | 300K | $0.00 | $0 | 300K |
| 2025-10-13 | Demopulos Gregory A MD | Chairman, CEO & President | Gift | 300K | $0.00 | $0 | 300K |
| 2025-10-13 | Demopulos Gregory A MD | Chairman, CEO & President | Gift | 600K | $0.00 | $0 | 1.4M |
| 2023-11-17 | Demopulos Gregory A MD | Chairman, CEO & President | Buy | 15K | $1.68 | $25K | 124K |
| 2023-11-15 | Demopulos Peter A MD | Director | Buy | 10K | $1.53 | $15K | 209K |
| 2023-11-14 | Demopulos Gregory A MD | Chairman, CEO & President | Grant | 25K | $1.44 | $36K | 109K |
| 2023-11-13 | Demopulos Gregory A MD | Chairman, CEO & President | Grant | 38K | $1.29 | $48K | 84K |
| 2023-09-12 | Bumol Thomas F. | Director | Grant | 10K | $3.31 | $33K | 10K |
| 2023-05-22 | Cable Thomas J. | Director | Exercise or conversion | 5K | $5.30 | $27K | 40K |
| 2023-05-22 | Cable Thomas J. | Director | Sell | 5K | $6.53 | $33K | 35K |
| 2023-05-22 | HANISH ARNOLD C | Director | Sell | 5K | $6.46 | $32K | 0 |
| 2023-05-22 | HANISH ARNOLD C | Director | Exercise or conversion | 5K | $5.30 | $27K | 5K |
| 2021-09-08 | HANISH ARNOLD C | Director | Exercise or conversion | 10K | $9.44 | $94K | 10K |
| 2021-06-17 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Exercise or conversion | 37K | $4.10 | $151K | 2.1M |
| 2021-06-17 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Sell | 37K | $14.90 | $549K | 2.0M |
| 2021-06-15 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Sell | 37K | $15.02 | $554K | 2.0M |
| 2021-06-15 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Exercise or conversion | 37K | $4.10 | $151K | 2.1M |
| 2021-05-20 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Sell | 37K | $14.96 | $551K | 2.0M |
| 2021-05-20 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Exercise or conversion | 37K | $4.10 | $151K | 2.1M |
| 2021-05-19 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Exercise or conversion | 37K | $4.10 | $151K | 2.1M |
| 2021-05-19 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Sell | 37K | $17.07 | $629K | 2.0M |
| 2021-04-08 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Sell | 35K | $17.76 | $625K | 2.0M |
| 2021-04-08 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Exercise or conversion | 35K | $4.10 | $144K | 2.1M |
| 2021-04-07 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Sell | 37K | $17.91 | $670K | 2.0M |
| 2021-04-07 | Demopulos Gregory A MD | CHAIRMAN, CEO & PRESIDENT | Exercise or conversion | 37K | $4.10 | $153K | 2.1M |
| 2021-02-22 | Demopulos Peter A MD | Director | Exercise or conversion | 5K | $5.30 | $27K | 194K |
| 2021-02-22 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Exercise or conversion | 8K | $10.27 | $83K | 22K |
| 2021-02-22 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Sell | 8K | $23.28 | $189K | 14K |
| 2021-02-22 | Demopulos Peter A MD | Director | Exercise or conversion | 5K | $4.53 | $23K | 199K |
| 2021-02-19 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Sell | 10K | $22.64 | $226K | 14K |
| 2021-02-19 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Exercise or conversion | 10K | $10.27 | $103K | 24K |
| 2021-02-12 | Hood Leroy E. MD PhD | Director | Exercise or conversion | 5K | $4.53 | $23K | 74K |
| 2021-02-10 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Sell | 2K | $22.49 | $43K | 14K |
| 2021-02-10 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Exercise or conversion | 2K | $10.27 | $20K | 16K |
| 2021-01-20 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Exercise or conversion | 10K | $9.37 | $94K | 14K |
| 2021-01-19 | JACOBSEN MICHAEL A | VP FINANCE AND CAO | Sell | 10K | $19.95 | $190K | 4K |
| 2021-01-13 | Cable Thomas J. | Director | Exercise or conversion | 5K | $4.53 | $23K | 40K |
| 2021-01-13 | Cable Thomas J. | Director | Sell | 5K | $16.97 | $85K | 35K |
| 2020-05-13 | Cable Thomas J. | Director | Exercise or conversion | 5K | $5.92 | $30K | 40K |
| 2020-05-13 | Cable Thomas J. | Director | Sell | 5K | $14.40 | $72K | 35K |
| 2020-03-13 | Hood Leroy E. MD PhD | Director | Exercise or conversion | 5K | $5.92 | $30K | 69K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON12 Form 144 notices on file for OMER worth $3.1M at the prices reported; 9 in the last 90 days worth $2.3M. Latest: DAVID BORGES filed on 2026-09-23 to sell 14,927 shares ($314K) from 2026-09-23.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-09-23 | DAVID BORGESOfficer | 15K | $314K | 0.021% | 2026-09-23 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-09-22 | DAVID BORGESOfficer | 10K | $185K | 0.014% | 2026-09-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-31 | PETER CANCELMOOfficer | 25K | $464K | 0.035% | 2026-08-31 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-28 | PETER CANCELMOOfficer | 25K | $466K | 0.035% | 2026-08-28 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-27 | ARNOLD HANISHDirector | 10K | $189K | 0.014% | 2026-08-27 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-26 | ARNOLD HANISHDirector | 5K | $94K | 0.007% | 2026-08-26 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-21 | DAVID BORGESOfficer | 11K | $203K | 0.015% | 2026-08-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-20 | THOMAS CABLEDirector | 15K | $277K | 0.021% | 2026-08-20 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-08-13 | DAVID BORGESOfficer | 5K | $69K | 0.007% | 2026-08-13 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-22 | Thomas CableDirector | 8K | $90K | 0.010% | 2026-05-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-13 | DAVID J BORGESOfficer | 30K | $369K | 0.042% | 2026-01-13 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-01-12 | DAVID J BORGESOfficer | 30K | $382K | 0.042% | 2026-01-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON1 holder reports 5% or more of OMER in its latest filing, on Schedule 13G (passive). The holder is BlackRock, Inc. at 8.2% of the class (5,961,792 shares), filed 2026-07-29 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-07-29 | 13G/Ano. 1 | BlackRock, Inc.parent holding company | 6.0M | 8.2% | 2026-06-30 |
| 2026-04-23 | 13G/Ano. 14 | INGALLS & SNYDER LLCbroker-dealer, investment adviser | 3.5M | 4.8% | 2025-12-31 |
| 2026-03-27 | 13G/Ano. 1 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding OMER at their latest 13F. JSON4 of the 30 tracked managers held OMER at their latest 13F, $8.2M in total at quarter-end prices. Two Sigma Investments is the largest at $3.8M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Two Sigma Investments | 2026-06-30 | 403K | $3.8M | 0.00% | +116K |
| Millennium Management | 2026-06-30 | 344K | $3.3M | 0.00% | -67K |
| Citadel Advisors | 2026-06-30 | 86K | $814K | 0.00% | -174K |
| AQR Capital Management | 2026-06-30 | 30K | $283K | 0.00% | -452 |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
Omeros in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Omeros (OMER), SEC CIK 1285819, listed on Nasdaq, classified by the SEC as pharmaceutical preparations. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-09-23.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-07-29.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-12.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-09-23.JSON and CSV
- Company record
- EDGAR filing index for CIK 1285819Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of OMER is sold short?
11,428,767 shares were held short at the 2026-10-15 settlement, 12.2 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is OMER's daily short volume?
On 2026-11-02, 198,255 of the 307,043 OMER shares reported to FINRA were sold short, 64.6% of the day's reported volume. Short volume is a flow for one day, not a position.
Does OMER have fails to deliver?
The SEC's latest file shows 18,060 OMER shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are OMER insiders buying or selling?
Insiders at OMER reported 11 open-market sells worth $2.2M in the last 90 days and no open-market buys. Latest filing: Borges David J. (VP, Finance & CAO) on 2026-09-23.
Have OMER insiders filed to sell?
12 Form 144 notices on file for OMER worth $3.1M at the prices reported; 9 in the last 90 days worth $2.3M. Latest: DAVID BORGES filed on 2026-09-23 to sell 14,927 shares ($314K) from 2026-09-23.
Who owns 5% or more of OMER?
1 holder reports 5% or more of OMER in its latest filing, on Schedule 13G (passive). The holder is BlackRock, Inc. at 8.2% of the class (5,961,792 shares), filed 2026-07-29 for an event on 2026-06-30.
Which tracked 13F managers own OMER?
4 of the 30 tracked 13F managers held OMER shares at their latest filing, $8.2M in all. The largest: Two Sigma Investments (403K shares, $3.8M), Izzy Englander's Millennium Management (344K shares, $3.3M), Ken Griffin's Citadel Advisors (86K shares, $814K), Cliff Asness's AQR Capital Management (30K shares, $283K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.