Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Share classes (cover page of the 10-Q filed 2026-08-03, as of 2026-07-30)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | KOS · NYSE | 595,487,651 | 431,000,546 | 72.4% | 268 | 500688106 |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (22 of 22 · 500688AH9)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | LMR Partners LLP | 58,970,000 | — | $43.4M | — |
| 2 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 54,600,000 | — | $40.8M | NEW |
| 3 | D. E. Shaw & Co., Inc. | 49,434,000 | — | $36.0M | +19,449,000 (+64.9%) |
| 4 | FMR LLC | 47,488,000 | — | $35.4M | +1,343,000 (+2.9%) |
| 5 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 41,392,000 | — | $30.1M | — |
| 6 | Converium Capital Inc. | 28,300,000 | — | $21.4M | — |
| 7 | BTG Pactual Asset Management US LLC | 15,705,000 | — | $11.5M | — |
| 8 | TWO SIGMA INVESTMENTS, LP | 15,171,000 | — | $11.3M | +10,171,000 (+203.4%) |
| 9 | Lombard Odier Asset Management (USA) Corp | 14,000,000 | — | $10.3M | — |
| 10 | Walleye Capital LLC | 13,688,000 | — | $10.4M | +2,130,000 (+18.4%) |
| 11 | Capula Management Ltd | 8,500,000 | — | $6.2M | +8,494,000 (+141566.7%) |
| 12 | STATE STREET CORP | 7,350,000 | — | $5.4M | -200,000 (-2.6%) |
| 13 | BlackRock, Inc. | 7,250,000 | — | $5.4M | +2,900,000 (+66.7%) |
| 14 | SSI INVESTMENT MANAGEMENT LLC | 5,824,000 | — | $4.2M | — |
| 15 | DEUTSCHE BANK AG\ | 4,990,000 | — | $3.7M | -3,722,000 (-42.7%) |
| 16 | MILLENNIUM MANAGEMENT LLC | 1,742,000 | — | $1.3M | NEW |
| 17 | UBS Group AG | 1,705,000 | — | $1.3M | — |
| 18 | ADVENT CAPITAL MANAGEMENT /DE/ | 1,240,000 | — | $949K | NEW |
| 19 | ZAZOVE ASSOCIATES LLC | 1,230,000 | — | $903K | -6,795,000 (-84.7%) |
| 20 | AMERIPRISE FINANCIAL INC | 690,000 | — | $521K | NEW |
| 21 | BARCLAYS PLC | 56,000 | — | $42K | — |
| 22 | SG Americas Securities, LLC | 7,600 | — | $548K | NEW |
Exited since 2026-03-31 (4 filers; largest 4 shown)
| ROYAL BANK OF CANADA | −17,210,000 |
| Weiss Asset Management LP | −10,391,000 |
| WHITEBOX ADVISORS LLC | −6,500,000 |
| Balyasny Asset Management L.P. | −3,052,000 |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| BlackRock, Inc. | SCHEDULE 13G/A | 2026-07-29 | 2026-06-30 | 47,915,849 | 8.1% |
| Grantham, Mayo, Van Otterloo & Co. LLC | SCHEDULE 13G/A | 2026-05-01 | 2026-03-31 | 18,307,718 | 3.16% |
| American Century Companies, Inc. | SCHEDULE 13G/A | 2026-02-13 | 2025-12-31 | 11,300,711 | 2.4% |
| American Century Investment Management, Inc. | SCHEDULE 13G/A | 2026-02-13 | 2025-12-31 | 11,300,711 | 2.4% |
| Stowers Institute for Medical Research | SCHEDULE 13G/A | 2026-02-13 | 2025-12-31 | 11,300,711 | 2.4% |
| BlackRock Portfolio Management LLC | SCHEDULE 13G/A | 2026-01-21 | 2025-12-31 | 8,291,480 | 1.7% |
| Hotchkis and Wiley Capital Management, LLC | SCHEDULE 13G/A | 2025-08-13 | 2025-06-30 | 21,210,674 | 4.44% |
| cobas asset management, sgiic, s.a. | SCHEDULE 13G | 2025-04-23 | 2025-04-10 | 24,779,551 | 5.2% |
| Vaughan Nelson Investment Management, Inc. | SCHEDULE 13G/A | 2025-04-17 | 2025-03-31 | 4,031,165 | 0.84% |
| Vaughan Nelson Investment Management, L.P. | SCHEDULE 13G/A | 2025-04-17 | 2025-03-31 | 4,031,165 | 0.84% |
| Abigail P. Johnson | SCHEDULE 13G/A | 2024-12-06 | 2024-11-29 | 9,829,850.81 | 2.1% |
| FMR LLC | SCHEDULE 13G/A | 2024-12-06 | 2024-11-29 | 9,829,850.81 | 2.1% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.