William Blair & Company
KOS icon

William Blair & Company’s Kosmos Energy KOS Stock Holding History

William Blair & Company’s Portfolio KOS Stock Details KOS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$231K Buy
109,544
+9,475
+9% +$26.4K ﹤0.01% 1519
2026
Q1 		$278K Buy
100,069
+69
+0.1% +$130 ﹤0.01% 1364
2025
Q4 		$90.7K Hold
100,000
– – ﹤0.01% 1577
2025
Q3 		$166K Hold
100,000
– – ﹤0.01% 1495
2025
Q2 		$172K Buy
100,000
+50,000
+100% +$90.5K ﹤0.01% 1441
2025
Q1 		$114K Buy
+50,000
New +$148K ﹤0.01% 1479
2024
Q4 		– Sell
-69,662
Closed -$281K – 1854
2024
Q3 		$281K Buy
69,662
+5,223
+8% +$25.4K ﹤0.01% 1312
2024
Q2 		$357K Buy
64,439
+7,170
+13% +$41.8K ﹤0.01% 1206
2024
Q1 		$341K Hold
57,269
– – ﹤0.01% 1208
2023
Q4 		$384K Hold
57,269
– – ﹤0.01% 1149
2023
Q3 		$468K Buy
57,269
+12,121
+27% +$85.9K ﹤0.01% 1075
2023
Q2 		$270K Sell
45,148
-12,003
-21% -$78.2K ﹤0.01% 1290
2023
Q1 		$425K Buy
+57,151
New +$419K ﹤0.01% 1105

Other funds holding KOS

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return
EPIM
Equinox Partners Investment Management Stamford, Connecticut $212M AUM 153.42% 1-Year Est. Return
Hotchkis & Wiley Capital Management
Hotchkis & Wiley Capital Management Los Angeles, California $34.3B AUM 22.63% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Charles Schwab
Charles Schwab San Francisco, California $751B AUM 38.74% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Grantham, Mayo, Van Otterloo & Co (GMO)
Grantham, Mayo, Van Otterloo & Co (GMO) Boston, Massachusetts $44.4B AUM 36.05% 1-Year Est. Return

William Blair & Company's KOS Position: Q2 2026 in Review

William Blair & Company increased its Kosmos Energy (KOS) stake by 9.5% in Q2 2026, buying an estimated $26.4K and bringing the position to 109,544 shares worth $231K. The position accounts for ﹤0.01% of the portfolio, ranked #1519.

William Blair & Company first reported a position in KOS in Q1 2023 and has held it in 13 quarters since. The position peaked at $468K in Q3 2023. 267 funds tracked by Wall St. Rank hold KOS as of Q2 2026.

  • William Blair & Company held 109,544 shares of Kosmos Energy worth $231K as of Q2 2026.
  • William Blair & Company bought 9,475 Kosmos Energy shares in Q2 2026, an estimated $26.4K.
  • Kosmos Energy made up ﹤0.01% of William Blair & Company's portfolio in Q2 2026, its #1519 holding.
  • William Blair & Company first reported a position in Kosmos Energy in Q1 2023 and has held it in 13 quarters since.
  • William Blair & Company's Kosmos Energy position peaked at $468K in Q3 2023.
  • 267 funds tracked by Wall St. Rank held Kosmos Energy as of Q2 2026.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.