奧梅羅斯公司
US ˙ NasdaqGM ˙ US6821431029

SecurityOMER / Omeros Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership317,892 shares
Latest Disclosed Value $ 3,356,940
Morgan Stanley reports 17.68% decrease in ownership of OMER / Omeros Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 317,892 shares of Omeros Corporation (US:OMER) valued at $3,356,940 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 386,152 shares of Omeros Corporation. This represents a change in shares of -17.68% during the quarter. The current value of the position is $3,112,163 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F OMEROS COM 682143102 317,892 -68,260 -17.68 3,357 -49.40 0.0002
2026-05-27 2025-12-31 13F/A-1 OMEROS COM 682143102 386,152 -1,603,582 -80.59 6,632 -18.70 0.0004
2026-02-13 2025-12-31 13F OMEROS COM 682143102 386,152 -1,603,582 6,632 0.0004
2026-05-27 2025-09-30 13F/A-1 OMEROS COM 682143102 1,989,734 634,175 46.78 8,158 100.61 0.0005
2025-11-14 2025-09-30 13F OMEROS COM 682143102 1,989,734 634,175 8,158 0.0005
2025-08-15 2025-06-30 13F OMEROS COM 682143102 1,355,559 595,199 78.28 4,067 -34.94 0.0003
2025-05-15 2025-03-31 13F OMEROS COM 682143102 760,360 426,478 127.73 6,250 89.51 0.0004
2025-05-15 2024-12-31 13F/A-1 OMEROS COM 682143102 333,882 35,956 12.07 3,299 179.02 0.0002
2025-02-14 2024-12-31 13F OMEROS COM 682143102 333,882 35,956 3,299 0.0002
2025-05-14 2024-09-30 13F/A-2 OMEROS COM 682143102 297,926 100,575 50.96 1,183 47.57 0.0001
2025-02-14 2024-09-30 13F/A-1 OMEROS COM 682143102 297,926 100,575 1,183 0.0001
2024-11-14 2024-09-30 13F OMEROS COM 682143102 297,926 100,575 1,183 0.0000
2025-05-14 2024-06-30 13F/A-2 OMEROS COM 682143102 197,351 -18,196 -8.44 801 7.81 0.0001
2024-10-17 2024-06-30 13F/A-1 OMEROS COM 682143102 197,351 -18,196 801 0.0001
2024-08-14 2024-06-30 13F OMEROS COM 682143102 197,351 -18,196 801 0.0001
2024-10-17 2024-03-31 13F/A-2 OMEROS COM 682143102 215,547 -66,858 -23.67 744 -19.50 0.0001
2024-08-16 2024-03-31 13F/A-1 OMEROS COM 682143102 215,547 -66,858 744 0.0000
2024-05-15 2024-03-31 13F OMEROS COM 682143102 215,547 -66,858 744 0.0001
2024-08-16 2023-12-31 13F/A-1 OMEROS COM 682143102 282,405 44,427 18.67 923 33.00 0.0001
2024-02-13 2023-12-31 13F OMEROS COM 682143102 282,405 44,427 923 0.0001
2023-11-15 2023-09-30 13F OMEROS COM 682143102 237,978 15,563 7.00 695 -42.60 0.0001
2023-08-14 2023-06-30 13F OMEROS COM 682143102 222,415 -41,891 -15.85 1,210 -1.63 0.0001
2023-05-15 2023-03-31 13F OMEROS COM 682143102 264,306 66,429 33.57 1,229 174.94 0.0001
2023-02-14 2022-12-31 13F OMEROS COM 682143102 197,877 -172,547 -46.58 447 -61.70 0.0001
2022-11-14 2022-09-30 13F OMEROS COM 682143102 370,424 -455,779 -55.17 1,167 -48.64 0.0002
2022-10-27 2022-06-30 13F/A-1 OMEROS COM 682143102 826,203 141,194 20.61 2,272 -44.80 0.0003
2022-08-15 2022-06-30 13F OMEROS COM 682143102 826,203 141,194 2,272 0.0001
2022-10-27 2022-03-31 13F/A-1 OMEROS COM 682143102 685,009 -379,682 -35.66 4,116 -39.87 0.0006
2022-05-13 2022-03-31 13F OMEROS COM 682143102 685,009 -379,682 4,116 0.0006
2022-02-14 2021-12-31 13F OMEROS COM 682143102 1,064,691 825,961 345.98 6,845 107.87 0.0008
2021-11-15 2021-09-30 13F OMEROS COM 682143102 238,730 -86,424 -26.58 3,293 -31.75 0.0004
2021-08-23 2021-06-30 13F/A-1 OMEROS COM 682143102 325,154 60,823 23.01 4,825 2.55 0.0006
2021-08-16 2021-06-30 13F OMEROS COM 682143102 325,154 60,823 4,825 0.0001
2021-05-17 2021-03-31 13F OMEROS COM 682143102 264,331 33,553 14.54 4,705 42.71 0.0007
2021-02-16 2020-12-31 13F OMEROS COM 682143102 230,778 -211,939 -47.87 3,297 -26.29 0.0005
2020-11-13 2020-09-30 13F OMEROS COM 682143102 442,717 306,684 225.45 4,473 123.43 0.0009
2020-08-14 2020-06-30 13F OMEROS COM 682143102 136,033 -26,343 -16.22 2,002 -7.78 0.0004
2020-05-26 2020-03-31 13F/A-1 OMEROS COM 682143102 162,376 -24,972 -13.33 2,171 -17.73 0.0006
2020-05-15 2020-03-31 13F OMEROS COM 682143102 162,376 -24,972 2,171 166.7781
2020-02-14 2019-12-31 13F OMEROS COM 682143102 187,348 62,208 49.71 2,639 29.05 0.0006
2019-11-14 2019-09-30 13F OMEROS COM 682143102 125,140 17,596 16.36 2,045 21.15 0.0005
2019-08-14 2019-06-30 13F OMEROS COM 682143102 107,544 13,752 14.66 1,688 3.69 0.0004
2019-05-15 2019-03-31 13F OMEROS COM 682143102 93,792 -49,583 -34.58 1,628 1.94 0.0005
2019-02-14 2018-12-31 13F OMEROS COM 682143102 143,375 -140,132 -49.43 1,597 -76.92 0.0005
2019-04-23 2018-09-30 13F/A-2 OMEROS COM 682143102 283,507 5,967 2.15 6,920 37.47 0.0017
2018-11-20 2018-09-30 13F/A-1 OMEROS COM 682143102 283,507 0 6,920 0.0017
2018-11-14 2018-09-30 13F OMEROS COM 682143102 283,507 5,967 6,920
2019-04-23 2018-06-30 13F/A-1 OMEROS COM 682143102 277,540 98,493 55.01 5,034 151.70 0.0014
2018-08-14 2018-06-30 13F OMEROS COM 682143102 277,540 98,493 5,034
2019-04-23 2018-03-31 13F/A-1 OMEROS COM 682143102 179,047 21,544 13.68 2,000 -34.66 0.0006
2018-05-14 2018-03-31 13F OMEROS COM 682143102 179,047 21,544 2,000
2019-04-23 2017-12-31 13F/A-1 OMEROS COM 682143102 157,503 63,741 67.98 3,061 51.01 0.0008
2018-02-14 2017-12-31 13F OMEROS COM 682143102 157,503 63,741 3,061
2017-11-14 2017-09-30 13F OMEROS COM 682143102 93,762 15,201 19.35 2,027 29.69 0.0006
2017-08-11 2017-06-30 13F OMEROS COM 682143102 78,561 -120,526 -60.54 1,563 -48.07 0.0005
2017-05-22 2017-03-31 13F/A-1 OMEROS COM 682143102 199,087 33,285 20.08 3,010 82.98 0.0009
2017-05-12 2017-03-31 13F OMEROS COM 682143102 199,087 3,010
2017-02-22 2016-12-31 13F/A-1 OMEROS COM 682143102 165,802 116,015 233.02 1,645 196.40 0.0005
2017-02-13 2016-12-31 13F OMEROS COM 682143102 165,802 1,645
2016-11-10 2016-09-30 13F OMEROS COM 682143102 49,787 6,054 13.84 555 20.65 0.0002
2016-08-12 2016-06-30 13F OMEROS COM 682143102 43,733 5,476 14.31 460 -21.64 0.0002
2016-05-12 2016-03-31 13F OMEROS COM 682143102 38,257 -9,871 -20.51 587 -22.46 0.0002
2016-02-09 2015-12-31 13F OMEROS COM 682143102 48,128 -48,232 -50.05 757 -28.31 0.0003
2016-02-08 2015-09-30 13F/A-1 OMEROS COM 682143102 96,360 44,751 86.71 1,056 13.79 0.0004
2015-11-09 2015-09-30 13F OMEROS COM 682143102 96,360 1,056
2015-08-12 2015-06-30 13F OMEROS COM 682143102 51,609 7,253 16.35 928 -5.11 0.0003
2015-05-14 2015-03-31 13F OMEROS COM 682143102 44,356 -13,157 -22.88 978 -31.37 0.0004
2015-02-13 2014-12-31 13F OMEROS COM 682143102 57,513 9,315 19.33 1,425 132.46 0.0005
2014-12-16 2014-09-30 13F/A-1 OMEROS COM 682143102 48,198 3,330 7.42 613 13.10 0.0002
2014-11-14 2014-09-30 13F OMEROS COM 682143102 48,198 613
2014-05-13 2014-03-31 13F OMEROS COM 682143102 44,868 14,589 48.18 542 58.48 0.0002
2014-02-13 2013-12-31 13F OMEROS COM 682143102 30,279 -33,854 -52.79 342 -45.28 0.0001
2013-11-13 2013-09-30 13F OMEROS COM 682143102 64,133 35,092 120.84 625 328.08 0.0003
2013-08-08 2013-06-30 13F OMEROS COM 682143102 29,041 29,041 146 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.