科斯莫斯能源有限公司
MX ˙ BMV ˙ US5006881065
SecurityMX:KOS / Kosmos Energy Ltd.
InstitutionRhumbline Advisers
Latest Disclosed Ownership590,100 shares
Latest Disclosed Value $ 1,640,469
Rhumbline Advisers reports 3.73% decrease in ownership of KOS / Kosmos Energy Ltd.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 590,100 shares of Kosmos Energy Ltd. (MX:KOS) valued at $1,640,469 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 612,964 shares of Kosmos Energy Ltd.. This represents a change in shares of -3.73% 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)
2026-05-12 2026-03-31 13F KOSMOS ENERGY COM 500688106 590,100 -22,864 -3.73 1,640 195.50 0.0014
2026-02-13 2025-12-31 13F KOSMOS ENERGY COM 500688106 612,964 -95,212 -13.44 556 -52.77 0.0004
2025-11-06 2025-09-30 13F KOSMOS ENERGY COM 500688106 708,176 -10,778 -1.50 1,176 -4.94 0.0009
2025-08-12 2025-06-30 13F KOSMOS ENERGY COM 500688106 718,954 52,750 7.92 1,237 -18.58 0.0011
2025-05-29 2025-03-31 13F/A-1 KOSMOS ENERGY COM 500688106 666,204 85,431 14.71 1,519 -23.56 0.0014
2025-04-08 2025-03-31 13F KOSMOS ENERGY COM 500688106 666,204 85,431 1,519 0.0014
2025-05-29 2024-12-31 13F/A-1 KOSMOS ENERGY COM 500688106 580,773 -24,695 -4.08 1,986 -18.61 0.0018
2025-01-30 2024-12-31 13F KOSMOS ENERGY COM 500688106 580,773 -24,695 1,986 0.0018
2024-11-12 2024-09-30 13F KOSMOS ENERGY COM 500688106 605,468 -66,744 -9.93 2,440 -34.48 0.0022
2024-08-01 2024-06-30 13F KOSMOS ENERGY COM 500688106 672,212 19,739 3.03 3,724 -4.22 0.0035
2024-05-09 2024-03-31 13F KOSMOS ENERGY COM 500688106 652,473 10,984 1.71 3,889 -9.67 0.0037
2024-02-08 2023-12-31 13F KOSMOS ENERGY COM 500688106 641,489 -167 -0.03 4,304 -17.99 0.0045
2023-11-09 2023-09-30 13F KOSMOS ENERGY COM 500688106 641,656 15,428 2.46 5,249 39.91 0.0061
2023-08-08 2023-06-30 13F KOSMOS ENERGY COM 500688106 626,228 13,010 2.12 3,751 93,675.00 0.0042
2023-05-11 2023-03-31 13F KOSMOS ENERGY COM 500688106 613,218 12,503 2.08 5 -99.90 0.0056
2023-02-14 2022-12-31 13F KOSMOS ENERGY COM 500688106 600,715 29,750 5.21 3,821 29.44 0.0051
2022-11-10 2022-09-30 13F KOSMOS ENERGY COM 500688106 570,965 46,157 8.80 2,952 -9.14 0.0044
2022-08-11 2022-06-30 13F KOSMOS ENERGY COM 500688106 524,808 21,250 4.22 3,249 -10.27 0.0047
2022-05-12 2022-03-31 13F KOSMOS ENERGY COM 500688106 503,558 37,023 7.94 3,621 124.35 0.0047
2022-02-10 2021-12-31 13F KOSMOS ENERGY COM 500688106 466,535 -93,619 -16.71 1,614 -2.65 0.0020
2021-11-12 2021-09-30 13F KOSMOS ENERGY COM 500688106 560,154 148,023 35.92 1,658 16.27 0.0022
2021-08-05 2021-06-30 13F KOSMOS ENERGY COM 500688106 412,131 -221,692 -34.98 1,426 -26.72 0.0019
2021-05-06 2021-03-31 13F KOSMOS ENERGY COM 500688106 633,823 -38,305 -5.70 1,946 23.16 0.0026
2021-02-10 2020-12-31 13F KOSMOS ENERGY COM 500688106 672,128 89,717 15.40 1,580 178.17 0.0022
2020-11-12 2020-09-30 13F KOSMOS ENERGY COM 500688106 582,411 -87,245 -13.03 568 -48.92 0.0009
2020-08-13 2020-06-30 13F KOSMOS ENERGY COM 500688106 669,656 323,038 93.20 1,112 257.56 0.0019
2020-05-06 2020-03-31 13F KOSMOS ENERGY COM 500688106 346,618 86,401 33.20 311 -79.03 0.0007
2020-02-05 2019-12-31 13F KOSMOS ENERGY COM 500688106 260,217 -782 -0.30 1,483 -8.96 0.0025
2019-10-23 2019-09-30 13F KOSMOS ENERGY COM 500688106 260,999 1,165 0.45 1,629 0.00 0.0030
2019-08-14 2019-06-30 13F KOSMOS ENERGY COM 500688106 259,834 73,324 39.31 1,629 40.19 0.0031
2019-05-01 2019-03-31 13F KOSMOS ENERGY COM 500688106 186,510 -25,932 -12.21 1,162 34.34 0.0023
2019-01-31 2018-12-31 13F KOSMOS ENERGY COM 500688106 212,442 9,813 4.84 865 -54.35 0.0019
2018-11-07 2018-09-30 13F KOSMOS ENERGY LTD F COM G5315B107 202,629 -1,893 -0.93 1,895 12.06 0.0037
2018-08-06 2018-06-30 13F KOSMOS ENERGY LTD F COM G5315B107 204,522 12,022 6.25 1,691 39.41 0.0034
2018-05-02 2018-03-31 13F KOSMOS ENERGY LTD F COM G5315B107 192,500 15,910 9.01 1,213 0.25 0.0025
2018-02-09 2017-12-31 13F KOSMOS ENERGY LTD F COM G5315B107 176,590 1,475 0.84 1,210 -13.20 0.0025
2017-11-06 2017-09-30 13F KOSMOS ENERGY LTD F COM G5315B107 175,115 11,717 7.17 1,394 33.14 0.0030
2017-08-02 2017-06-30 13F KOSMOS ENERGY LTD F COM G5315B107 163,398 18,920 13.10 1,047 8.84 0.0024
2017-05-02 2017-03-31 13F KOSMOS ENERGY LTD F COM G5315B107 144,478 10,555 7.88 962 2.45 0.0022
2017-01-27 2016-12-31 13F KOSMOS ENERGY LTD F COM G5315B107 133,923 18,288 15.82 939 26.72 0.0024
2016-11-08 2016-09-30 13F KOSMOS ENERGY LTD F COM G5315B107 115,635 9,166 8.61 741 27.76 0.0020
2016-08-11 2016-06-30 13F KOSMOS ENERGY LTD F COM G5315B107 106,469 13,593 14.64 580 7.21 0.0017
2016-05-02 2016-03-31 13F KOSMOS ENERGY LTD COM G5315B107 92,876 2,100 2.31 541 14.62 0.0017
2016-02-03 2015-12-31 13F KOSMOS ENERGY LTD COM G5315B107 90,776 1,280 1.43 472 -5.41 0.0015
2015-11-04 2015-09-30 13F KOSMOS ENERGY LTD COM G5315B107 89,496 6,037 7.23 499 -29.12 0.0017
2015-08-04 2015-06-30 13F KOSMOS ENERGY LTD COM G5315B107 83,459 4,250 5.37 704 12.28 0.0022
2015-05-12 2015-03-31 13F KOSMOS ENERGY LTD COM G5315B107 79,209 3,190 4.20 627 -1.72 0.0018
2015-02-06 2014-12-31 13F KOSMOS ENERGY LTD COM G5315B107 76,019 1,650 2.22 638 -13.90 0.0019
2014-11-12 2014-09-30 13F KOSMOS ENERGY LTD COM G5315B107 74,369 -593 -0.79 741 -12.00 0.0022
2014-08-06 2014-06-30 13F KOSMOS ENERGY LTD COM G5315B107 74,962 4,386 6.21 842 8.51 0.0025
2014-05-06 2014-03-31 13F KOSMOS ENERGY LTD COM G5315B107 70,576 -5,533 -7.27 776 -8.81 0.0023
2014-02-03 2013-12-31 13F KOSMOS ENERGY LTD COM G5315B107 76,109 -10,041 -11.66 851 -3.95 0.0025
2013-11-05 2013-09-30 13F KOSMOS ENERGY LTD COM G5315B107 86,150 -1,060 -1.22 886 0.00 0.0027
2013-08-07 2013-06-30 13F KOSMOS ENERGY LTD COM G5315B107 87,210 87,210 886 0.0028
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.