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Kosmos Energy Ltd.

KOS
Exchange
NYSE
Industry
Crude Petroleum & Natural Gas
SEC CIK
0001509991

In the last 90 days, Kosmos Energy Ltd. insiders filed 0 open-market purchases and 4 sales; 268 institutions reported holding it in 13F filings for Q2 2026, worth $909.1M in total; no superinvestor holds it.

Holders of 5% or more of KOS

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Kosmos Energy Ltd., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of KOS
HolderLatest formStakeChangeFirst filedLatest filingFiling
BlackRock, Inc.13G/A8.10%47.9M shares+1.40 ppfrom 6.70%Feb 5, 20254 filingsJul 29, 2026SEC
cobas asset management, sgiic, s.a.13G5.20%24.8M shares–Aug 20, 20213 filingsApr 23, 2025SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

49 Schedule 13D and 13G filings on Kosmos Energy Ltd., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on KOS
Filed (ET)FilerFormStakeChangeEvent dateFiling
Jul 29, 20263:19 PM ETBlackRock, Inc.13G/A8.10%47.9M shares+1.40 ppfrom 6.70%Jun 30, 2026SEC
May 1, 20261:25 PM ETGrantham, Mayo, Van Otterloo & Co. LLC13G/A3.16%18.3M shares−4.11 ppfrom 7.27%Below 5%Mar 31, 2026SEC
Apr 24, 20264:11 PM ETBlackRock, Inc.13G/A6.70%39.8M shares−1.20 ppfrom 7.90%Mar 31, 2026SEC
Feb 13, 20269:58 AM ETAmerican Century Investment Management Incand 2 others13G/A2.40%11.3M shares−4.60 ppfrom 7.00%Below 5%Dec 31, 2025SEC
Jan 21, 202612:26 PM ETBlackRock Portfolio Management LLC13G/A1.70%8.29M shares−4.60 ppfrom 6.30%Below 5%Dec 31, 2025SEC
Nov 5, 20251:42 PM ETGrantham, Mayo, Van Otterloo & Co. LLC13G/A7.27%34.8M shares−1.07 ppfrom 8.34%Sep 30, 2025SEC
Aug 14, 20259:07 AM ETAmerican Century Investment Management Incand 2 others13G/A7.00%33.4M shares–Jun 30, 2025SEC
Aug 13, 20258:52 PM ETHotchkis & Wiley Capital Management LLC13G/A4.44%21.2M shares−0.90 ppfrom 5.34%Below 5%Jun 30, 2025SEC
Jul 15, 20255:12 PM ETBlackRock Portfolio Management LLC13G/A6.30%30.3M shares+1.10 ppfrom 5.20%Jun 30, 2025SEC
May 14, 20254:07 PM ETHotchkis & Wiley Capital Management LLC13G5.34%25.5M shares–Mar 31, 2025SEC
May 1, 20258:17 AM ETGrantham, Mayo, Van Otterloo & Co. LLC13G/A8.34%39.9M shares0.00 ppfrom 8.34%Mar 31, 2025SEC
May 1, 20258:17 AM ETGrantham, Mayo, Van Otterloo & Co. LLC13G/A8.34%39.9M shares+1.43 ppfrom 6.91%Mar 31, 2025SEC
Apr 23, 202511:25 AM ETcobas asset management, sgiic, s.a.13G5.20%24.8M shares–Apr 10, 2025SEC
Apr 17, 20253:30 PM ETVaughan Nelson Investment Management, L.P.and 1 other13G/A0.84%4.03M shares−4.48 ppfrom 5.32%Below 5%Mar 31, 2025SEC
Apr 16, 20256:22 PM ETBlackRock, Inc.13G/A7.90%37.8M shares−4.10 ppfrom 12.00%Mar 31, 2025SEC
Apr 15, 20255:04 PM ETBlackRock Portfolio Management LLC13G5.20%25.0M sharesNewMar 31, 2025SEC
Feb 12, 20259:03 AM ETGrantham, Mayo, Van Otterloo & Co. LLC13G/A6.91%32.6M shares–Dec 31, 2024SEC
Feb 5, 20251:23 PM ETBlackRock, Inc.13G/A12.00%56.7M shares–Dec 31, 2024SEC
Jan 30, 20259:35 AM ETVaughan Nelson Investment Management, L.P.and 1 other13G/A5.32%25.1M shares–Dec 31, 2024SEC
Dec 6, 202411:45 AM ETFMR LLCand 1 other13G/A2.10%9.83M shares–Below 5%Nov 29, 2024SEC
Nov 8, 2024American Century Investment Management Inc13GOld format–New–SEC
Aug 12, 2024FMR LLC13G/AOld format–––SEC
Mar 7, 202412:29 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 13, 2024Grantham, Mayo, Van Otterloo & Co. LLC13GOld format–––SEC
Feb 9, 2024FMR LLC13G/AOld format–––SEC
Jan 26, 2024Vaughan Nelson Investment Management, L.P.13G/AOld format–––SEC
Jan 24, 20242:27 PM ETBlackRock Inc.13G/AOld format–––SEC
Jan 22, 2024State Street Corp13G/AOld format–––SEC
Sep 7, 20239:38 AM ETBlackRock Inc.13G/AOld format–––SEC
Feb 14, 2023Hotchkis & Wiley Capital Management LLC13G/AOld format–––SEC
Feb 13, 2023Grantham, Mayo, Van Otterloo & Co. LLC13GOld format–––SEC
Feb 9, 2023FMR LLC13G/AOld format–––SEC
Feb 3, 20234:27 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 3, 2023Vaughan Nelson Investment Management, L.P.13G/AOld format–––SEC
Feb 3, 2023State Street Corp13GOld format–New–SEC
Feb 11, 2022Hotchkis & Wiley Capital Management LLC13GOld format–––SEC
Feb 11, 2022Grantham, Mayo, Van Otterloo & Co. LLC13GOld format–––SEC
Feb 9, 2022Vaughan Nelson Investment Management, L.P.13G/AOld format–––SEC
Feb 3, 20224:41 PM ETBlackRock Inc.13G/AOld format–––SEC
Jan 10, 2022FMR LLC13G/AOld format–––SEC
Nov 18, 2021cobas asset management, sgiic, s.a.13G/AOld format–––SEC
Sep 10, 2021FMR LLC13G/AOld format–––SEC
Aug 20, 2021cobas asset management, sgiic, s.a.13G/AOld format–––SEC
Feb 12, 2021Grantham, Mayo, Van Otterloo & Co. LLC13GOld format–New–SEC
Feb 11, 2021Vaughan Nelson Investment Management, L.P.13G/AOld format–––SEC
Feb 10, 2021Hotchkis & Wiley Capital Management LLC13G/AOld format–––SEC
Feb 8, 2021FMR LLC13G/AOld format–––SEC
Feb 4, 2021Wellington Management Group LLP13G/AOld format–––SEC
Jan 26, 20216:52 PM ETBlackRock Inc.13G/AOld format–––SEC

Form 144: proposed insider sales

2 notices from officers, directors and other affiliates planning to sell Kosmos Energy Ltd. shares, newest first.

Form 144 notices for KOS
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Jun 9, 20232:38 PM ETFranklin Roy A.Director8.00K$54.4KJun 9, 2023Fidelity Brokerage Services LLCSEC
Jun 9, 20231:33 PM ETGoodwin Deanna LDirector112.0K$748.6KJun 9, 2023Fidelity Brokerage Services LLCSEC