Kosmos Energy Ltd.
MX ˙ BMV ˙ US5006881065
SecurityMX:KOS / Kosmos Energy Ltd.
InstitutionNomura Holdings Inc
Latest Disclosed Ownership2,354,135 shares
Latest Disclosed Value $ 6,544,495
Nomura Holdings Inc ownership in KOS / Kosmos Energy Ltd.

On May 15, 2026 - Nomura Holdings Inc filed a 13F-HR form disclosing ownership of 2,354,135 shares of Kosmos Energy Ltd. (MX:KOS) valued at $6,544,495 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,026,002 shares of Kosmos Energy Ltd.. This represents a change in shares of 129.45% during the quarter.

Nomura Holdings Inc has a history of taking positions in derivatives of the underlying security (KOS) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:KOS / Kosmos Energy Ltd. Historical Put/Call Ratio
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 KOSMOS ENERGY COM 500688106 2,354,135 1,328,133 129.45 6,544 603.66 0.0133
2026-02-17 2025-12-31 13F KOSMOS ENERGY COM 500688106 1,026,002 -848,671 -45.27 931 -70.11 0.0012
2025-11-14 2025-09-30 13F KOSMOS ENERGY COM 500688106 1,874,673 -94,664 -4.81 3,112 -8.15 0.0048
2025-08-14 2025-06-30 13F KOSMOS ENERGY COM 500688106 1,969,337 -208,348 -9.57 3,387 -31.78 0.0056
2025-05-15 2025-03-31 13F KOSMOS ENERGY COM 500688106 2,177,685 -176,547 -7.50 4,965 -38.33 0.0093
2025-02-14 2024-12-31 13F KOSMOS ENERGY COM 500688106 2,354,232 30,540 1.31 8,051 -14.02 0.0109
2025-01-13 2024-09-30 13F/A-1 KOSMOS ENERGY COM 500688106 2,323,692 171,316 7.96 9,364 -21.47 0.0215
2024-11-14 2024-09-30 13F KOSMOS ENERGY COM 500688106 2,323,692 171,316 9,364 0.0156
2024-08-14 2024-06-30 13F KOSMOS ENERGY COM 500688106 2,152,376 2,114,035 5,513.77 11,924 5,129.82 0.0229
2024-05-15 2024-03-31 13F KOSMOS ENERGY COM 500688106 38,341 -828,911 -95.58 229 -96.08 0.0006
2024-03-27 2023-12-31 13F/A-1 KOSMOS ENERGY COM 500688106 867,252 867,252 5,819 0.0158
2024-02-14 2023-12-31 13F KOSMOS ENERGY COM 500688106 867,252 867,252 5,819 0.0120
2023-11-14 2023-09-30 13F KOSMOS ENERGY COM 500688106 0 -100,000 -100.00 0 -100.00
2023-08-14 2023-06-30 13F KOSMOS ENERGY COM 500688106 100,000 100,000 599 0.0016
2020-05-15 2020-03-31 13F/A-1 KOSMOS ENERGY CMN 500688106 0 -21,466 -100.00 0 -100.00
2020-02-14 2019-12-31 13F KOSMOS ENERGY CMN 500688106 21,466 21,466 122 0.0005
2019-02-14 2018-12-31 13F KOSMOS ENERGY CMN G5315B107 0 -729,857 -100.00 0 -100.00
2018-11-14 2018-09-30 13F KOSMOS ENERGY CMN G5315B107 729,857 168,899 30.11 7,009 51.09 0.0246
2018-08-17 2018-06-30 13F/A-1 KOSMOS ENERGY CMN G5315B107 560,958 171,658 44.09 4,639 73.94 0.0148
2018-08-14 2018-06-30 13F KOSMOS ENERGY CMN G5315B107 560,958 171,658 4,311
2018-05-14 2018-03-31 13F KOSMOS ENERGY CMN G5315B107 389,300 0 0.00 2,667 0.00 0.0023
2018-02-14 2017-12-31 13F KOSMOS ENERGY CMN G5315B107 389,300 389,300 2,667 0.0047
2016-09-02 2016-06-30 13F/A-1 KOSMOS ENERGY CMN G5315B107 0 -58,259 -100.00 0 -100.00
2016-05-16 2016-03-31 13F KOSMOS ENERGY CMN G5315B107 58,259 28,931 98.65 337 121.71 0.0011
2016-02-12 2015-12-31 13F KOSMOS ENERGY CMN G5315B107 29,328 29,328 0.00 152 0.0004
2015-08-14 2015-06-30 13F KOSMOS ENERGY CMN G5315B107 0 -35,139 -100.00 0 -100.00
2015-05-15 2015-03-31 13F KOSMOS ENERGY CMN G5315B107 35,139 -75,478 -68.23 285 -69.90 0.0009
2015-02-17 2014-12-31 13F KOSMOS ENERGY CMN G5315B107 110,617 -90,212 -44.92 947 -52.79 0.0025
2014-11-14 2014-09-30 13F KOSMOS ENERGY CMN G5315B107 200,829 94,220 88.38 2,006 68.71 0.0054
2014-08-13 2014-06-30 13F KOSMOS ENERGY CMN G5315B107 106,609 72,825 215.56 1,189 220.49 0.0003
2014-05-14 2014-03-31 13F KOSMOS ENERGY CMN G5315B107 33,784 -81,328 -70.65 371 -71.17 0.0001
2014-02-14 2013-12-31 13F KOSMOS ENERGY CMN G5315B107 115,112 76,003 194.34 1,287 219.35 0.0059
2013-11-14 2013-09-30 13F KOSMOS ENERGY CMN G5315B107 39,109 -54,417 -58.18 403 -57.62 0.0024
2013-08-15 2013-06-30 13F KOSMOS ENERGY CMN G5315B107 93,526 80,221 602.94 951 534.00 0.0077
2013-08-16 2013-03-31 13F/A-2 KOSMOS ENERGY CMN G5315B107 13,305 13,305 150 0.0016
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2019-02-14 2018-12-31 13F KOSMOS ENERGY CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-11-14 2018-09-30 13F KOSMOS ENERGY CMN Call 200,000 1,921 n/a n/a n/a
2018-08-17 2018-06-30 13F/A KOSMOS ENERGY CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2018-05-14 2018-03-31 13F KOSMOS ENERGY CMN Call 300,000 0.00 2,055 0.00 n/a n/a n/a
2018-02-14 2017-12-31 13F KOSMOS ENERGY CMN Call 300,000 2,055 n/a n/a n/a
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.