Kosmos Energy Ltd.
Kosmos Energy Ltd. (KOS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · KOS · as of Mar 31, 2025
Ownership Breakdown
268
Institutional Holders
▼ 13 vs Q4
$991.01M
Total Inst. Value
▼ $492.22M vs Q4
485.27M
Shares Outstanding
freeFloat 100.56%
435.47M
13F Shares Held
▲ 997,447 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
KOS largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. crude petroleum & natural gas | 62.80M | 13.20% | 13.20% | $143.19B | May 2, 2025 | ▲ 6.14M |
GRANTHAM, MAYO, VAN OTTERLOO & CO. LLC crude petroleum & natural gas | 39.89M | 8.39% | 8.39% | $90.94B | May 14, 2025 | ▲ 7.26M |
AMERICAN CENTURY COMPANIES INC crude petroleum & natural gas | 29.24M | 6.15% | 6.15% | $66.66B | May 13, 2025 | ▼ 320.9K |
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC crude petroleum & natural gas | 25.53M | 5.37% | 5.37% | $58.20B | May 14, 2025 | ▲ 2.11M |
STATE STREET CORP crude petroleum & natural gas | 19.59M | 4.12% | 4.12% | $44.67B | May 15, 2025 | ▲ 523.7K |
EQUINOX PARTNERS INVESTMENT MANAGEMENT LLC crude petroleum & natural gas | 18.39M | 3.87% | 3.87% | $41.93B | May 15, 2025 | ▲ 6.97M |
PATIENT CAPITAL MANAGEMENT, LLC crude petroleum & natural gas | 18.00M | 3.79% | 3.79% | $41.05B | May 14, 2025 | ▲ 857.1K |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC crude petroleum & natural gas | 17.17M | 3.61% | 3.61% | $39.15B | May 9, 2025 | ▼ 1.57M |
VANGUARD GROUP INC crude petroleum & natural gas | 14.10M | 2.96% | 2.96% | $32.15B | May 9, 2025 | ▼ 799.2K |
DIMENSIONAL FUND ADVISORS LP crude petroleum & natural gas | 12.39M | 2.60% | 2.60% | $28.25B | May 13, 2025 | ▲ 722.7K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
34
Increased
+56.43M shares4
New Positions
first time holders12
Decreased
−27.38M shares0
Sold Out
fully exitedNet shares change (top 50)
+29.05M
+56.43M / −27.38M
Net new holders
+26
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
KOS insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
7
Buy transactions
5
Sell transactions
1.40
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Grant John Douglas Kelso director | May 28, 2026 | Award | 62,044 | $2.74 | $170.0K | 144.4K | Form 4 ↗ |
Grant John Douglas Kelso director | May 27, 2026 | Tax Withhold | 735 | $2.85 | $2.1K | 125.8K | Form 4 ↗ |
Grant John Douglas Kelso director | May 27, 2026 | Sale | 43,466 | $2.73 | $118.7K | 82.3K | Form 4 ↗ |
Sterin Steven director | May 28, 2026 | Award | 62,044 | $2.74 | $170.0K | 393.3K | Form 4 ↗ |
Sterin Steven director | May 27, 2026 | Sale | 38,636 | $2.73 | $105.5K | 331.3K | Form 4 ↗ |
Franklin Roy A. director | May 28, 2026 | Award | 62,044 | $2.74 | $170.0K | 212.8K | Form 4 ↗ |
Franklin Roy A. director | May 27, 2026 | Tax Withhold | 976 | $2.85 | $2.8K | 194.2K | Form 4 ↗ |
Franklin Roy A. director | May 28, 2026 | Sale | 43,466 | $2.73 | $118.7K | 150.7K | Form 4 ↗ |
STICE J MICHAEL director | May 28, 2026 | Award | 62,044 | $2.74 | $170.0K | 269.7K | Form 4 ↗ |
GOODWIN DEANNA L director | May 28, 2026 | Award | 62,044 | $2.74 | $170.0K | 288.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Kosmos Energy Ltd. (KOS) is primarily owned by institutional investors, who hold approximately 89.7% of total shares outstanding. Company insiders own approximately 0.00%, while retail and public investors account for the remaining 10.82%.
The largest institutional shareholder of Kosmos Energy Ltd. is BLACKROCK, INC., holding approximately 62.80 million shares — equal to 13.20% of outstanding shares — as of March 31, 2025.
A total of 268 institutional investors currently hold KOS stock, with a combined institutional value of approximately $991,007,713 as of the most recent 13F filing period.
Frequently asked questions
KOS ownershipKosmos Energy Ltd. (KOS) is primarily owned by institutional investors, who hold approximately 89.7% of shares. The largest shareholder is BLACKROCK, INC. with a 13.20% stake. Company insiders hold 0.00%. Data sourced from SEC Form 13F as of March 31, 2025.