Portolan Capital Management’s Kosmos Energy KOS Stock Holding History

Portolan Capital Management’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	–	Sell	-602,542	Closed	-$1.68M	–	162
2026 Q1	$1.68M	Buy	+602,542	New	+$1.13M	0.09%	128
2025 Q2	–	Sell	-2,011,814	Closed	-$4.59M	–	130
2025 Q1	$4.59M	Buy	2,011,814 +394,308	+24%	+$1.16M	0.35%	78
2024 Q4	$5.53M	Buy	+1,617,506	New	+$6.15M	0.37%	84
2024 Q1	–	Sell	-474,354	Closed	-$3.18M	–	135
2023 Q4	$3.18M	Sell	474,354 -1,577,971	-77%	-$11M	0.28%	94
2023 Q3	$16.8M	Buy	+2,052,325	New	+$14.5M	1.57%	17
2023 Q2	–	Sell	-399,008	Closed	-$2.97M	–	149
2023 Q1	$2.97M	Buy	+399,008	New	+$2.92M	0.28%	103
2022 Q4	–	Sell	-779,637	Closed	-$4.03M	–	146
2022 Q3	$4.03M	Buy	+779,637	New	+$4.72M	0.43%	85

Other funds holding KOS

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

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 Los Angeles, California $34.3B AUM 22.63% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Charles Schwab San Francisco, California $751B AUM 38.74% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Grantham, Mayo, Van Otterloo & Co (GMO) Boston, Massachusetts $44.4B AUM 36.05% 1-Year Est. Return

Portolan Capital Management's KOS Position: Q2 2026 in Review

Portolan Capital Management sold out of Kosmos Energy (KOS) in Q2 2026, closing a stake of 602,542 shares — an estimated $1.68M sold.

Portolan Capital Management first reported a position in KOS in Q3 2022 and held it in 7 quarters. The position peaked at $16.8M in Q3 2023. 267 funds tracked by Wall St. Rank hold KOS as of Q2 2026.

Portolan Capital Management reported no remaining Kosmos Energy position as of Q2 2026 after selling out during the quarter.
Portolan Capital Management sold 602,542 Kosmos Energy shares in Q2 2026, an estimated $1.68M.
Portolan Capital Management first reported a position in Kosmos Energy in Q3 2022 and held it in 7 quarters.
Portolan Capital Management's Kosmos Energy position peaked at $16.8M in Q3 2023.
267 funds tracked by Wall St. Rank held Kosmos Energy as of Q2 2026.

Based on Portolan Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.