KOS Institutional Ownership & Shareholders
KOSMOS ENERGY LTD (KOS) is currently held by 258 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $916.49M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of KOS tracked by InsiderSet, reporting ownership valued at approximately $118.21M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $159.67M, representing an estimated gain of +35.07% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 53% of the total disclosed KOS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., State Street Corp, Two Sigma Investments, Lp, and several other long-term asset managers with concentrated positions in KOSMOS ENERGY LTD (KOS).
This page ranks the largest institutional KOS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
258
Total Reported Value
$916.49M
Largest Holder
Blackrock, Inc.
Largest Position
$118.21M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
58
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 56,023,521 | $118,209,630 | $159,667,035 | +$41,457,405 | +35.07% | |
| State Street Corp | 0.00% | 29,453,016 | $62,145,864 | $83,941,096 | +$21,795,232 | +35.07% | |
| Two Sigma Investments, Lp | 0.04% | 25,398,092 | $53,589,974 | $72,384,562 | +$18,794,588 | +35.07% | |
| D. E. Shaw & Co., Inc. | 0.03% | 24,538,308 | $51,775,830 | $69,934,178 | +$18,158,348 | +35.07% | |
| Equinox Partners Investment Management Llc | 20.54% | 20,678,033 | $43,630,650 | $58,932,394 | +$15,301,744 | +35.07% | |
| Hotchkis & Wiley Capital Management Llc | 0.12% | 18,844,781 | $39,762,488 | $53,707,626 | +$13,945,138 | +35.07% | |
| Geode Capital Management, Llc | 0.00% | 17,066,608 | $36,016,959 | $48,639,833 | +$12,622,874 | +35.05% | |
| Charles Schwab Investment Management Inc | 0.00% | 13,769,666 | $29,053,995 | $39,243,548 | +$10,189,553 | +35.07% | |
| Vanguard Portfolio Management Llc | 0.00% | 12,000,418 | $25,320,882 | $34,201,191 | +$8,880,309 | +35.07% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 0.06% | 11,850,124 | $25,003,762 | $33,772,853 | +$8,769,091 | +35.07% | |
| Invesco Ltd. | 0.00% | 10,949,038 | $23,102,470 | $31,204,758 | +$8,102,288 | +35.07% | |
| Dimensional Fund Advisors Lp | 0.00% | 9,582,883 | $20,217,815 | $27,311,217 | +$7,093,402 | +35.08% | |
| Goldman Sachs Group Inc | 0.00% | 8,531,947 | $18,002,409 | $24,316,049 | +$6,313,640 | +35.07% | |
| American Century Companies Inc | 0.01% | 8,036,479 | $16,956,971 | $22,903,965 | +$5,946,994 | +35.07% | |
| Davidson Kempner Capital Management Lp | 0.27% | 8,000,323 | $16,880,682 | $22,800,921 | +$5,920,239 | +35.07% | |
| Millennium Management Llc | 0.01% | 7,429,695 | $15,676,656 | $21,174,631 | +$5,497,975 | +35.07% | |
| Morgan Stanley | 0.00% | 7,360,428 | $15,530,504 | $20,977,220 | +$5,446,716 | +35.07% | |
| Nuveen, Llc | 0.00% | 7,330,487 | $15,467,327 | $20,891,888 | +$5,424,561 | +35.07% | |
| M&G Plc | 0.07% | 7,409,687 | $14,819,374 | $21,117,608 | +$6,298,234 | +42.50% | |
| Renaissance Technologies LLC | Jim Simons | 0.02% | 7,008,668 | $14,788,289 | $19,974,704 | +$5,186,415 | +35.07% |
| Vanguard Capital Management Llc | 0.00% | 6,812,762 | $14,374,928 | $19,416,372 | +$5,041,444 | +35.07% | |
| Ubs Group Ag | 0.00% | 6,079,462 | $12,827,665 | $17,326,467 | +$4,498,802 | +35.07% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 4,153,678 | $11,547,226 | $11,837,982 | +$290,756 | +2.52% | |
| Northern Trust Corp | 0.00% | 5,312,419 | $11,209,204 | $15,140,394 | +$3,931,190 | +35.07% | |
| Bridgewater Associates, Lp | 0.04% | 4,720,550 | $9,960,361 | $13,453,568 | +$3,493,207 | +35.07% | |
| Boston Partners | 0.01% | 4,097,453 | $8,931,635 | $11,677,741 | +$2,746,106 | +30.75% | |
| Aqr Capital Management Llc | 0.00% | 4,087,736 | $8,625,123 | $11,650,048 | +$3,024,925 | +35.07% | |
| First Trust Advisors Lp | 0.00% | 4,013,283 | $8,468,027 | $11,437,857 | +$2,969,830 | +35.07% | |
| Ostrum Asset Management | 0.41% | 4,008,525 | $8,457,988 | $11,424,296 | +$2,966,308 | +35.07% | |
| Vaughan Nelson Investment Management, L.P. | 0.07% | 4,008,525 | $8,457,988 | $11,424,296 | +$2,966,308 | +35.07% | |
| Vanguard Fiduciary Trust Co | 0.00% | 3,481,976 | $7,346,969 | $9,923,632 | +$2,576,663 | +35.07% | |
| Susquehanna International Group, Llp | 0.01% | 3,356,675 | $7,082,584 | $9,566,524 | +$2,483,940 | +35.07% | |
| Bank Of America Corp | 0.00% | 2,932,515 | $6,187,606 | $8,357,668 | +$2,170,062 | +35.07% | |
| Geosphere Capital Management, Llc | 3.08% | 2,813,788 | $5,937,093 | $8,019,296 | +$2,082,203 | +35.07% | |
| Russell Investments Group, Ltd. | 0.00% | 2,643,845 | $5,578,512 | $7,534,958 | +$1,956,446 | +35.07% | |
| Algert Global Llc | 0.06% | 2,490,698 | $5,255,373 | $7,098,489 | +$1,843,116 | +35.07% | |
| Wells Fargo & Company/Mn | 0.00% | 2,057,790 | $4,341,937 | $5,864,702 | +$1,522,765 | +35.07% | |
| Nomura Holdings Inc | 0.02% | 2,029,307 | $4,281,838 | $5,783,525 | +$1,501,687 | +35.07% | |
| Ballast Asset Management, Lp | 1.69% | 2,008,153 | $4,237,203 | $5,723,236 | +$1,486,033 | +35.07% | |
| Point72 Asset Management, L.P. | 0.01% | 1,977,722 | $4,172,993 | $5,636,508 | +$1,463,515 | +35.07% | |
| Bank Of New York Mellon Corp | 0.00% | 1,854,622 | $3,913,253 | $5,285,673 | +$1,372,420 | +35.07% | |
| Barclays Plc | 0.00% | 1,733,808 | $3,658,335 | $4,941,353 | +$1,283,018 | +35.07% | |
| Gotham Asset Management, Llc | 0.01% | 1,590,570 | $3,356,103 | $4,533,125 | +$1,177,022 | +35.07% | |
| Lmr Partners Llp | 0.02% | 1,505,351 | $3,176,291 | $4,290,250 | +$1,113,959 | +35.07% | |
| Lpl Financial Llc | 0.00% | 1,377,423 | $2,906,363 | $3,925,656 | +$1,019,293 | +35.07% | |
| Creative Planning | 0.00% | 1,144,152 | $2,906,147 | $3,260,833 | +$354,686 | +12.20% | |
| Squarepoint Ops Llc | 0.01% | 1,376,536 | $2,904,491 | $3,923,128 | +$1,018,637 | +35.07% | |
| Centerbook Partners Lp | 0.11% | 982,829 | $2,496,386 | $2,801,063 | +$304,677 | +12.20% | |
| Swiss National Bank | 0.00% | 1,160,400 | $2,448,444 | $3,307,140 | +$858,696 | +35.07% | |
| Man Group Plc | 0.00% | 1,142,835 | $2,411,382 | $3,257,080 | +$845,698 | +35.07% |
Frequently asked questions about KOS
Who are the largest institutional holders of KOS?
The largest institutional holders of KOS reported in the latest SEC Form 13F filings include Blackrock, Inc., State Street Corp, Two Sigma Investments, Lp, D. E. Shaw & Co., Inc., and Equinox Partners Investment Management Llc. InsiderSet ranks institutional holders by their latest reported KOS position.
What is KOS institutional ownership?
This page tracks KOS positions reported by institutional investment managers through SEC Form 13F. KOSMOS ENERGY LTD (KOS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own KOS?
InsiderSet currently tracks 258 institutional managers reporting KOS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of KOS shareholders.
How much KOS stock do institutions own?
Institutional investment managers disclosed approximately $916.49M in KOS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was KOS institutional ownership last updated?
The latest KOS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional KOS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its KOS position after the reporting date.
Are institutions buying or selling KOS?
Institutional buying and selling can be analyzed by comparing KOS positions across consecutive 13F reporting periods. InsiderSet's KOS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View KOS ownership changes.
How has KOS institutional ownership changed over time?
InsiderSet tracks KOS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.