Jane Street
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Jane Street’s Mammoth Energy Services TUSK Stock Holding History

Jane Street’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
2019
Q1 		– Sell
-45,000
Closed -$809K – 5653
2018
Q4 		$809K Hold
45,000
– – ﹤0.01% 2863
2018
Q3 		$1.31M Buy
+45,000
New +$1.48M ﹤0.01% 2417

Other funds holding TUSK

WC
Wexford Capital West Palm Beach, Florida $782M AUM 62.56% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return
Vanguard Capital Management
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
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Marshall Wace
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
BCM
Bridgeway Capital Management Houston, Texas $5.69B AUM 60.64% 1-Year Est. Return

Jane Street's TUSK Position: Q2 2026 in Review

Jane Street increased its Mammoth Energy Services (TUSK) stake by 2,117% in Q2 2026, buying an estimated $1.42M and bringing the position to 506,662 shares worth $1.65M. The position accounts for ﹤0.01% of the portfolio, ranked #5527.

Jane Street first reported a position in TUSK in Q1 2018 and has held it in 22 quarters since. 93 funds tracked by Wall St. Rank hold TUSK as of Q2 2026.

  • Jane Street held 506,662 shares of Mammoth Energy Services worth $1.65M as of Q2 2026.
  • Jane Street bought 483,808 Mammoth Energy Services shares in Q2 2026, an estimated $1.42M.
  • Mammoth Energy Services made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #5527 holding.
  • Jane Street first reported a position in Mammoth Energy Services in Q1 2018 and has held it in 22 quarters since.
  • 93 funds tracked by Wall St. Rank held Mammoth Energy Services as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.