Omeros Corporation
US ˙ NasdaqGM ˙ US6821431029

SecurityOMER / Omeros Corporation
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership96,518 shares
Latest Disclosed Value $ 289,554
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series ownership in OMER / Omeros Corporation

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 96,518 shares of Omeros Corporation (US:OMER) valued at $289,554 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 96,518 shares of Omeros Corporation. This represents a change in shares of 0.00% during the quarter. The current value of the position is $944,911 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.

Upgrade to unlock premium data and export to Excel .

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)
2025-08-26 2025-06-30 NP Omeros EC US6821431029 96,518 0 0.00 290 -63.56 0.0065
2025-05-28 2025-03-31 NP Omeros EC US6821431029 96,518 0 0.00 793 -16.79 0.0190
2025-02-25 2024-12-31 NP Omeros EC US6821431029 96,518 -11,733 -10.84 954 122.14 0.0208
2024-11-26 2024-09-30 NP Omeros EC US6821431029 108,251 -10,172 -8.59 430 -10.62 0.0081
2024-08-26 2024-06-30 NP Omeros EC US6821431029 118,423 14,474 13.92 481 34.08 0.0098
2024-05-28 2024-03-31 NP Omeros EC US6821431029 103,949 0 0.00 359 5.60 0.0075
2024-02-26 2023-12-31 NP Omeros EC US6821431029 103,949 0 0.00 340 11.88 0.0073
2023-11-28 2023-09-30 NP Omeros EC US6821431029 103,949 0 0.00 304 -46.37 0.0079
2023-08-25 2023-06-30 NP Omeros EC US6821431029 103,949 8,852 9.31 565 -1.05 0.0134
2022-05-26 2022-03-31 NP Omeros EC US6821431029 95,097 4,294 4.73 572 -2.06 0.0133
2022-02-25 2021-12-31 NP Omeros EC US6821431029 90,803 0 0.00 584 -53.43 0.0127
2021-11-24 2021-09-30 NP Omeros EC US6821431029 90,803 0 0.00 1,252 -7.05 0.0276
2021-08-26 2021-06-30 NP Omeros EC US6821431029 90,803 0 0.00 1,348 -16.65 0.0289
2021-05-27 2021-03-31 NP Omeros EC US6821431029 90,803 -5,329 -5.54 1,616 17.70 0.0367
2021-02-25 2020-12-31 NP Omeros EC US6821431029 96,132 0 0.00 1,373 41.40 0.0352
2020-11-25 2020-09-30 NP Omeros EC US6821431029 96,132 6,280 6.99 971 -26.55 0.0312
2020-08-27 2020-06-30 NP Omeros EC US6821431029 89,852 6,586 7.91 1,323 18.78 0.0432
2020-06-01 2020-03-31 NP Omeros EC US6821431029 83,266 11,240 15.61 1,113 9.76 0.0455
2020-02-27 2019-12-31 NP Omeros EC 682143102 72,026 1,037 1.46 1,015 -12.51 0.0305
2019-11-27 2019-09-30 NP Omeros EC US6821431029 70,989 70,989 1,159 0.0383
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.