Kosmos Energy Ltd.
US ˙ NYSE ˙ US5006881065

SecurityKOS / Kosmos Energy Ltd.
InstitutionSei Investments Co
Latest Disclosed Ownership857,578 shares
Latest Disclosed Value $ 778,166
Sei Investments Co reports 204.15% increase in ownership of KOS / Kosmos Energy Ltd.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 857,578 shares of Kosmos Energy Ltd. (US:KOS) valued at $778,166 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 281,960 shares of Kosmos Energy Ltd.. This represents a change in shares of 204.15% during the quarter. The current value of the position is $2,564,158 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)
2026-02-13 2025-12-31 13F KOSMOS ENERGY COM 500688106 857,578 575,618 204.15 778 66.24 0.0008
2025-11-13 2025-09-30 13F KOSMOS ENERGY COM 500688106 281,960 74,666 36.02 468 31.46 0.0005
2025-08-14 2025-06-30 13F KOSMOS ENERGY COM 500688106 207,294 -30,812 -12.94 357 -34.32 0.0004
2025-05-14 2025-03-31 13F/A-1 KOSMOS ENERGY COM 500688106 238,106 92,948 64.03 543 9.27 0.0007
2025-05-13 2025-03-31 13F KOSMOS ENERGY COM 500688106 144,906 -252 493 0.0005
2025-02-11 2024-12-31 13F KOSMOS ENERGY COM 500688106 145,158 17,808 13.98 496 -3.31 0.0006
2024-11-12 2024-09-30 13F KOSMOS ENERGY COM 500688106 127,350 29,912 30.70 513 -4.82 0.0007
2024-08-13 2024-06-30 13F KOSMOS ENERGY COM 500688106 97,438 0 0.00 540 -7.07 0.0008
2024-05-07 2024-03-31 13F KOSMOS ENERGY COM 500688106 97,438 -40,198 -29.21 581 -37.16 0.0009
2024-02-14 2023-12-31 13F KOSMOS ENERGY COM 500688106 137,636 -4,627 -3.25 924 -20.64 0.0015
2023-11-14 2023-09-30 13F KOSMOS ENERGY COM 500688106 142,263 20,810 17.13 1,164 59.97 0.0021
2023-08-11 2023-06-30 13F KOSMOS ENERGY COM 500688106 121,453 -3,635 -2.91 728 -21.83 0.0013
2023-05-12 2023-03-31 13F KOSMOS ENERGY COM 500688106 125,088 18,266 17.10 931 36.97 0.0017
2023-02-10 2022-12-31 13F KOSMOS ENERGY COM 500688106 106,822 18,049 20.33 680 47.93 0.0015
2022-11-14 2022-09-30 13F KOSMOS ENERGY COM 500688106 88,773 23,262 35.51 459 13.05 0.0010
2022-08-15 2022-06-30 13F KOSMOS ENERGY COM 500688106 65,511 0 0.00 406 -13.80 0.0009
2022-05-13 2022-03-31 13F KOSMOS ENERGY COM 500688106 65,511 -93,149 -58.71 471 -14.21 0.0009
2022-02-14 2021-12-31 13F KOSMOS ENERGY COM 500688106 158,660 -75,200 -32.16 549 -20.66 0.0010
2021-11-12 2021-09-30 13F KOSMOS ENERGY COM 500688106 233,860 96,949 70.81 692 45.99 0.0015
2021-08-06 2021-06-30 13F KOSMOS ENERGY COM 500688106 136,911 0 0.00 474 12.86 0.0011
2021-05-12 2021-03-31 13F KOSMOS ENERGY COM 500688106 136,911 0 0.00 420 30.43 0.0011
2021-02-08 2020-12-31 13F KOSMOS ENERGY COM 500688106 136,911 -110,935 -44.76 322 33.06 0.0008
2020-12-04 2020-09-30 13F/A-1 KOSMOS ENERGY COM 500688106 247,846 -264,515 -51.63 242 -71.53 0.0007
2020-11-06 2020-09-30 13F KOSMOS ENERGY COM 500688106 247,846 -264,515 242 582.6822
2020-08-17 2020-06-30 13F/A-1 KOSMOS ENERGY COM 500688106 512,361 411,050 405.73 850 834.07 0.0026
2020-08-11 2020-06-30 13F KOSMOS ENERGY COM 500688106 500,002 398,691 1,189 3,225.2258
2020-05-14 2020-03-31 13F KOSMOS ENERGY COM 500688106 101,311 12,359 13.89 91 -82.05 0.0003
2020-02-06 2019-12-31 13F KOSMOS ENERGY COM 500688106 88,952 5,555 6.66 507 -2.50 0.0015
2019-11-12 2019-09-30 13F KOSMOS ENERGY COM 500688106 83,397 14,935 21.82 520 21.21 0.0013
2019-08-14 2019-06-30 13F KOSMOS ENERGY COM 500688106 68,462 -21,885 -24.22 429 -23.80 0.0014
2019-05-15 2019-03-31 13F KOSMOS ENERGY COM 500688106 90,347 85,117 1,627.48 563 1,048.98 0.0019
2019-02-13 2018-12-31 13F KOSMOS ENERGY SHS G5315B107 5,230 0 0.00 49 0.00 0.0002
2018-11-08 2018-09-30 13F KOSMOS ENERGY SHS G5315B107 5,230 -1,613 -23.57 49 -12.50 0.0002
2018-08-03 2018-06-30 13F KOSMOS ENERGY SHS G5315B107 6,843 -2 -0.03 56 27.27 0.0002
2018-05-11 2018-03-31 13F KOSMOS ENERGY SHS G5315B107 6,845 76 1.12 44 -6.38 0.0002
2018-02-08 2017-12-31 13F KOSMOS ENERGY SHS G5315B107 6,769 710 11.72 47 -2.08 0.0002
2017-11-06 2017-09-30 13F KOSMOS ENERGY SHS G5315B107 6,059 -146 -2.35 48 20.00 0.0002
2017-07-31 2017-06-30 13F KOSMOS ENERGY SHS G5315B107 6,205 -102 -1.62 40 -4.76 0.0002
2017-05-05 2017-03-31 13F KOSMOS ENERGY SHS G5315B107 6,307 -3,315 -34.45 42 -37.31 0.0002
2017-02-02 2016-12-31 13F KOSMOS ENERGY SHS G5315B107 9,622 -568 -5.57 67 3.08 0.0003
2016-11-04 2016-09-30 13F KOSMOS ENERGY SHS G5315B107 10,190 -783 -7.14 65 10.17 0.0003
2016-08-11 2016-06-30 13F KOSMOS ENERGY SHS G5315B107 10,973 420 3.98 59 -4.84 0.0004
2016-05-10 2016-03-31 13F/A-1 KOSMOS ENERGY SHS G5315B107 10,553 365 3.58 62 16.98 0.0004
2016-02-03 2015-12-31 13F KOSMOS ENERGY SHS G5315B107 10,188 9,874 3,144.59 53 2,550.00 0.0003
2015-11-02 2015-09-30 13F/A-1 KOSMOS ENERGY SHS G5315B107 314 293 1,395.24 2 0.0000
2015-10-30 2015-09-30 13F KOSMOS ENERGY SHS G5315B107 314 2
2015-08-07 2015-06-30 13F/A-1 KOSMOS ENERGY SHS G5315B107 21 0 0.00 0 0.0000
2015-08-04 2015-06-30 13F KOSMOS ENERGY SHS G5315B107 21 0 0 0.0000
2015-05-14 2015-03-31 13F/A-1 KOSMOS ENERGY SHS G5315B107 21 -163 -88.59 0 -100.00
2015-05-01 2015-03-31 13F KOSMOS ENERGY SHS G5315B107 21 0
2015-02-10 2014-12-31 13F KOSMOS ENERGY SHS G5315B107 184 184 2 0.0000
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.