Kosmos Energy Ltd.
GB ˙ BATS-CHIXE ˙ US5006881065
SecurityGB:KOSL / Kosmos Energy Ltd.
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership168,691 shares
Latest Disclosed Value $ 468,961
Marshall Wace, Llp reports 407.01% increase in ownership of KOSL / Kosmos Energy Ltd.

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 168,691 shares of Kosmos Energy Ltd. (GB:KOSL) valued at $468,961 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 33,272 shares of Kosmos Energy Ltd.. This represents a change in shares of 407.01% during the quarter.

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)
2026-05-14 2026-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 168,691 135,419 407.01 469 1,460.00 0.0002
2026-02-13 2025-12-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 33,272 -12,554 -27.39 30 -60.53 0.0000
2025-11-13 2025-09-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 45,826 22,291 94.71 76 90.00 0.0001
2025-08-13 2025-06-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 23,535 0 0.00 40 -24.53 0.0000
2025-05-15 2025-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 23,535 23,535 54 0.0001
2024-11-14 2024-09-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 0 -250,735 -100.00 0 -100.00
2024-08-14 2024-06-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 250,735 124,058 97.93 1,389 84.22 0.0019
2024-05-15 2024-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 126,677 126,677 755 0.0011
2023-05-15 2023-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 0 -49,342 -100.00 0 -100.00
2023-02-14 2022-12-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 49,342 -9,158 -15.65 314 3.30 0.0007
2022-11-14 2022-09-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 58,500 -473,620 -89.01 303 -90.80 0.0007
2022-08-15 2022-06-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 532,120 -2,235,715 -80.77 3,294 -83.45 0.0068
2022-05-16 2022-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 2,767,835 2,767,835 19,901 0.0377
2020-08-13 2020-06-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 0 -939,285 -100.00 0 -100.00
2020-05-15 2020-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 939,285 -185,526 -16.49 845 -86.82 0.0084
2020-02-14 2019-12-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 1,124,811 -229,244 -16.93 6,412 -24.11 0.0441
2019-11-14 2019-09-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 1,354,055 724,850 115.20 8,449 114.17 0.0664
2019-08-14 2019-06-30 13F KOSMOS ENERGY LT COMMON STOCK 500688106 629,205 305,056 94.11 3,945 95.39 0.0325
2019-05-29 2019-03-31 13F/A-1 KOSMOS ENERGY LT COMMON STOCK 500688106 324,149 324,149 2,019 0.0190
2019-05-14 2019-03-31 13F KOSMOS ENERGY LT COMMON STOCK 500688106 324,149 2,019
2018-11-14 2018-09-30 13F KOSMOS ENERGY LT COMMON STOCK G5315B107 0 -30,275 -100.00 0 -100.00
2018-08-14 2018-06-30 13F KOSMOS ENERGY LT COMMON STOCK G5315B107 30,275 30,275 250 0.0037
2015-08-14 2015-06-30 13F KOSMOS ENERGY LT COMMON STOCK G5315B107 0 -19,417 -100.00 0 -100.00
2015-05-11 2015-03-31 13F KOSMOS ENERGY LT COMMON STOCK G5315B107 19,417 19,417 154 0.0020
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.