There is a long list of 242 institutional holders of KOS within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of KOS by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-KOS table below, the initial column indicates the name of each top institutional holder of KOS, with a link to that fund's top holdings. The next columns indicate the amount of KOS stock held by each of the institutional holders of KOS, followed by the KOS position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
FMR LLC	59,523,638	$399,404	12/31/2023
KOS	59,523,638	$399,404	12/31/2023
BlackRock Inc.	45,633,208	$306,199	12/31/2023
KOS	45,633,208	$306,199	12/31/2023
Grantham Mayo Van Otterloo & Co. LLC	23,134,180	$155,230	12/31/2023
KOS	23,134,180	$155,230	12/31/2023
Price T Rowe Associates Inc. MD	22,894,352	$153,623	12/31/2023
KOS	22,894,352	$153,623	12/31/2023
Vaughan Nelson Investment Management L.P.	25,145,473	$149,867	03/31/2024
KOS	25,145,473	$149,867	03/31/2024
State Street Corp	18,009,440	$120,843	12/31/2023
KOS	18,009,440	$120,843	12/31/2023
Hotchkis & Wiley Capital Management LLC	17,574,855	$117,927	12/31/2023
KOS	17,574,855	$117,927	12/31/2023
Vanguard Group Inc.	12,715,994	$85,324	12/31/2023
KOS	12,715,994	$85,324	12/31/2023
William Blair Investment Management LLC	12,194,346	$81,824	12/31/2023
KOS	12,194,346	$81,824	12/31/2023
Dimensional Fund Advisors LP	9,687,431	$65,005	12/31/2023
KOS	9,687,431	$65,005	12/31/2023
Geode Capital Management LLC	9,607,426	$64,473	12/31/2023
KOS	9,607,426	$64,473	12/31/2023
Maple Rock Capital Partners Inc.	8,970,519	$60,192	12/31/2023
KOS	8,970,519	$60,192	12/31/2023
Invesco Ltd.	8,220,200	$55,158	12/31/2023
KOS	8,220,200	$55,158	12/31/2023
RWC Asset Advisors US LLC	7,599,325	$50,991	12/31/2023
KOS	7,599,325	$50,991	12/31/2023
Encompass Capital Advisors LLC	7,454,218	$50,018	12/31/2023
KOS	7,454,218	$50,018	12/31/2023
American Century Companies Inc.	6,542,971	$43,903	12/31/2023
KOS	6,542,971	$43,903	12/31/2023
Patient Capital Management LLC	6,363,423	$42,699	12/31/2023
KOS	6,363,423	$42,699	12/31/2023
Natixis Advisors L.P.	6,831,202	$40,714	03/31/2024
KOS	6,831,202	$40,714	03/31/2024
JPMorgan Chase & Co.	6,025,841	$40,433	12/31/2023
KOS	6,025,841	$40,433	12/31/2023
Jennison Associates LLC	5,736,668	$38,493	12/31/2023
KOS	5,736,668	$38,493	12/31/2023
Russell Investments Group Ltd.	5,015,102	$33,651	12/31/2023
KOS	5,015,102	$33,651	12/31/2023
Charles Schwab Investment Management Inc.	4,968,781	$33,341	12/31/2023
KOS	4,968,781	$33,341	12/31/2023
Northern Trust Corp	4,706,022	$31,577	12/31/2023
KOS	4,706,022	$31,577	12/31/2023
Equinox Partners Investment Management LLC	5,230,829	$31,176	03/31/2024
KOS	5,230,829	$31,176	03/31/2024
Adage Capital Partners GP L.L.C.	4,600,000	$30,866	12/31/2023
KOS	4,600,000	$30,866	12/31/2023
Balyasny Asset Management LLC	4,556,840	$30,576	12/31/2023
KOS	4,556,840	$30,576	12/31/2023
Boston Partners	4,405,659	$29,315	12/31/2023
KOS	4,405,659	$29,315	12/31/2023
Natixis Investment Managers International	4,008,525	$26,897	12/31/2023
KOS	4,008,525	$26,897	12/31/2023
Morgan Stanley	3,913,315	$26,258	12/31/2023
KOS	3,913,315	$26,258	12/31/2023
Goldman Sachs Group Inc.	3,201,036	$21,479	12/31/2023
KOS	3,201,036	$21,479	12/31/2023
Loomis Sayles & Co. L P	3,093,237	$20,756	12/31/2023
KOS	3,093,237	$20,756	12/31/2023
Van ECK Associates Corp	2,926,866	$19,639	12/31/2023
KOS	2,926,866	$19,639	12/31/2023
Nuveen Asset Management LLC	2,872,205	$19,272	12/31/2023
KOS	2,872,205	$19,272	12/31/2023
RWC Asset Management LLP	2,819,433	$18,918	12/31/2023
KOS	2,819,433	$18,918	12/31/2023
Key Group Holdings Cayman LTD.	2,810,000	$18,855	12/31/2023
KOS	2,810,000	$18,855	12/31/2023
BNP PARIBAS ASSET MANAGEMENT Holding S.A.	2,601,983	$17,459	12/31/2023
KOS	2,601,983	$17,459	12/31/2023
M&G Investment Management Ltd.	2,434,842	$17,044	12/31/2023
KOS	2,434,842	$17,044	12/31/2023
Weiss Asset Management LP	2,200,000	$14,762	12/31/2023
KOS	2,200,000	$14,762	12/31/2023
Aventail Capital Group LP	2,087,461	$14,007	12/31/2023
KOS	2,087,461	$14,007	12/31/2023
Ameriprise Financial Inc.	1,951,001	$13,091	12/31/2023
KOS	1,951,001	$13,091	12/31/2023
Bank of New York Mellon Corp	2,192,555	$13,068	03/31/2024
KOS	2,192,555	$13,068	03/31/2024
ExodusPoint Capital Management LP	1,755,769	$11,781	12/31/2023
KOS	1,755,769	$11,781	12/31/2023
Oslo Asset Management AS	1,700,000	$11,407	12/31/2023
KOS	1,700,000	$11,407	12/31/2023
Mackay Shields LLC	1,503,656	$10,090	12/31/2023
KOS	1,503,656	$10,090	12/31/2023
First Trust Advisors LP	1,327,478	$8,907	12/31/2023
KOS	1,327,478	$8,907	12/31/2023
Millennium Management LLC	1,290,628	$8,660	12/31/2023
KOS	1,290,628	$8,660	12/31/2023
Mesirow Institutional Investment Management Inc.	1,226,476	$8,230	12/31/2023
KOS	1,226,476	$8,230	12/31/2023
Lazard Asset Management LLC	1,162,521	$7,800	12/31/2023
KOS	1,162,521	$7,800	12/31/2023
Bridgewater Associates LP	1,116,939	$7,495	12/31/2023
KOS	1,116,939	$7,495	12/31/2023
BNP Paribas Arbitrage SA		$7,386	12/31/2023
KOS	1,085,668	$7,285	12/31/2023
Call	150	$101	12/31/2023