John Overdeck’s Mammoth Energy Services TUSK Stock Holding History

John Overdeck’s Portfolio TUSK Stock Details TUSK Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$190K	Buy	+58,538	New	+$171K	﹤0.01%	4802
2023 Q3	–	Sell	-36,242	Closed	-$175K	–	3226
2023 Q2	$175K	Sell	36,242 -73,164	-67%	-$303K	﹤0.01%	2671
2023 Q1	$462K	Sell	109,406 -49,517	-31%	-$295K	﹤0.01%	2238
2022 Q4	$1.37M	Buy	158,923 +31,806	+25%	+$181K	﹤0.01%	1533
2022 Q3	$433K	Buy	127,117 +68,802	+118%	+$240K	﹤0.01%	1838
2022 Q2	$128K	Sell	58,315 -60,643	-51%	-$136K	﹤0.01%	2238
2022 Q1	$253K	Buy	+118,958	New	+$216K	﹤0.01%	2271
2021 Q3	–	Sell	-45,720	Closed	-$210K	–	4730
2021 Q2	$210K	Sell	45,720 -13,458	-23%	-$55.5K	﹤0.01%	3760
2021 Q1	$315K	Buy	59,178 +8,963	+18%	+$45.3K	﹤0.01%	3292
2020 Q4	$223K	Buy	+50,215	New	+$122K	﹤0.01%	3059
2020 Q3	–	Sell	-26,900	Closed	-$32K	–	3567
2020 Q2	$32K	Sell	26,900 -160,890	-86%	-$187K	﹤0.01%	2854
2020 Q1	$141K	Sell	187,790 -291,461	-61%	-$384K	﹤0.01%	2765
2019 Q4	$1.05M	Buy	479,251 +124,896	+35%	+$224K	﹤0.01%	2134
2019 Q3	$879K	Buy	354,355 +251,934	+246%	+$1.2M	﹤0.01%	2094
2019 Q2	$705K	Buy	+102,421	New	+$1.3M	﹤0.01%	2230
2018 Q2	–	Sell	-10,811	Closed	-$347K	–	3663
2018 Q1	$347K	Buy	+10,811	New	+$270K	﹤0.01%	2703

Other funds holding TUSK

Wexford Capital West Palm Beach, Florida $782M AUM 62.56% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

PLC

Peapod Lane Capital Bedford Hills, New York $148M AUM 89.92% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

Citadel Advisors Miami, Florida $875B AUM 40.91% 1-Year Est. Return

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

Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return

JHU

Johns Hopkins University Baltimore, Maryland $1.5B AUM 13.39% 1-Year Est. Return

John Overdeck's TUSK Position: Q2 2026 in Review

John Overdeck opened a new position in Mammoth Energy Services (TUSK) in Q2 2026: 58,538 shares worth $190K. The stake represents ﹤0.01% of the portfolio and ranks #4802 among its holdings. This is a return to the name: John Overdeck previously reported a position in TUSK as recently as Q2 2023.

John Overdeck first reported a position in TUSK in Q1 2018 and has held it in 16 quarters since. The position peaked at $1.37M in Q4 2022. 94 funds tracked by Wall St. Rank hold TUSK as of Q2 2026.

John Overdeck held 58,538 shares of Mammoth Energy Services worth $190K as of Q2 2026.
Mammoth Energy Services was a new John Overdeck position in Q2 2026.
Mammoth Energy Services made up ﹤0.01% of John Overdeck's portfolio in Q2 2026, its #4802 holding.
John Overdeck first reported a position in Mammoth Energy Services in Q1 2018 and has held it in 16 quarters since.
John Overdeck's Mammoth Energy Services position peaked at $1.37M in Q4 2022.
94 funds tracked by Wall St. Rank held Mammoth Energy Services as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.