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 Sep 30, 2025
Ownership Breakdown
248
Institutional Holders
▲ 7 vs Q2
$662.70M
Total Inst. Value
▼ $54.99M vs Q2
485.27M
Shares Outstanding
freeFloat 100.56%
397.57M
13F Shares Held
▼ 18.64M vs Q2
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
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. crude petroleum & natural gas | 68.91M | 14.41% | 14.41% | $114.39B | Nov 12, 2025 | ▲ 683.6K |
GRANTHAM, MAYO, VAN OTTERLOO & CO. LLC crude petroleum & natural gas | 34.78M | 7.28% | 7.28% | $57.74B | Nov 13, 2025 | ▼ 2.04M |
AMERICAN CENTURY COMPANIES INC crude petroleum & natural gas | 30.38M | 6.35% | 6.35% | $50.42B | Nov 12, 2025 | ▼ 3.04M |
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC crude petroleum & natural gas | 21.00M | 4.39% | 4.39% | $34.85B | Nov 14, 2025 | ▼ 215.2K |
STATE STREET CORP crude petroleum & natural gas | 19.41M | 4.06% | 4.06% | $32.21B | Nov 14, 2025 | ▲ 3.16M |
EQUINOX PARTNERS INVESTMENT MANAGEMENT LLC crude petroleum & natural gas | 17.78M | 3.72% | 3.72% | $29.52B | Nov 13, 2025 | ▼ 891.0K |
MILLENNIUM MANAGEMENT LLC crude petroleum & natural gas | 16.18M | 3.38% | 3.38% | $26.86B | Nov 14, 2025 | ▲ 8.52M |
VANGUARD GROUP INC crude petroleum & natural gas | 14.32M | 3.00% | 3.00% | $23.77B | Nov 7, 2025 | ▲ 286.6K |
BANK OF AMERICA CORP /DE/ crude petroleum & natural gas | 11.33M | 2.37% | 2.37% | $18.81B | Feb 3, 2026 | ▲ 3.22M |
GEODE CAPITAL MANAGEMENT, LLC crude petroleum & natural gas | 10.44M | 2.18% | 2.18% | $17.33B | Nov 12, 2025 | ▼ 823.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
27
Increased
+25.48M shares0
New Positions
first time holders18
Decreased
−33.72M shares0
Sold Out
fully exitedNet shares change (top 50)
8.24M
+25.48M / −33.72M
Net new holders
+9
0 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 81.9% of total shares outstanding. Company insiders own approximately 0.00%, while retail and public investors account for the remaining 18.63%.
The largest institutional shareholder of Kosmos Energy Ltd. is BLACKROCK, INC., holding approximately 68.91 million shares — equal to 14.41% of outstanding shares — as of September 30, 2025.
A total of 248 institutional investors currently hold KOS stock, with a combined institutional value of approximately $662,703,670 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 81.9% of shares. The largest shareholder is BLACKROCK, INC. with a 14.41% stake. Company insiders hold 0.00%. Data sourced from SEC Form 13F as of September 30, 2025.