JY
TUSK icon

Jeff Yass’s Mammoth Energy Services TUSK Stock Holding History

Jeff Yass’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 		$162K Buy
49,920
+13,621
+38% +$39.8K ﹤0.01% 12141
2026
Q1 		$88.9K Buy
36,299
+26,035
+254% +$59.3K ﹤0.01% 12410
2025
Q4 		$19K Sell
10,264
-62,614
-86% -$126K ﹤0.01% 11974
2025
Q3 		$167K Sell
72,878
-49,674
-41% -$122K ﹤0.01% 11175
2025
Q2 		$343K Buy
122,552
+29,063
+31% +$74.4K ﹤0.01% 10041
2025
Q1 		$191K Buy
93,489
+33,937
+57% +$90.5K ﹤0.01% 10983
2024
Q4 		$179K Sell
59,552
-20,084
-25% -$74K ﹤0.01% 10846
2024
Q3 		$326K Buy
79,636
+48,730
+158% +$178K ﹤0.01% 9426
2024
Q2 		$101K Sell
30,906
-7,695
-20% -$26.4K ﹤0.01% 11024
2024
Q1 		$141K Buy
+38,601
New +$145K ﹤0.01% 10959
2023
Q4 		– Sell
-48,121
Closed -$213K – 13321
2023
Q3 		$223K Sell
48,121
-2,280
-5% -$11.1K ﹤0.01% 9996
2023
Q2 		$243K Sell
50,401
-28,982
-37% -$120K ﹤0.01% 9863
2023
Q1 		$335K Buy
79,383
+2,351
+3% +$14K ﹤0.01% 9481
2022
Q4 		$666K Buy
77,032
+18,526
+32% +$105K ﹤0.01% 7141
2022
Q3 		$199K Buy
58,506
+13,716
+31% +$47.8K ﹤0.01% 10853
2022
Q2 		$99K Sell
44,790
-45,213
-50% -$101K ﹤0.01% 11491
2022
Q1 		$192K Sell
90,003
-15,922
-15% -$28.9K ﹤0.01% 11289
2021
Q4 		$193K Buy
105,925
+76,263
+257% +$199K ﹤0.01% 11486
2021
Q3 		$86K Buy
29,662
+16,657
+128% +$59.4K ﹤0.01% 12151
2021
Q2 		$60K Sell
13,005
-96,953
-88% -$399K ﹤0.01% 12256
2021
Q1 		$585K Buy
109,958
+70,281
+177% +$356K ﹤0.01% 9121
2020
Q4 		$177K Buy
+39,677
New +$96.6K ﹤0.01% 10135
2020
Q3 		– Sell
-33,931
Closed -$40K – 11169
2020
Q2 		$40K Buy
+33,931
New +$39.4K ﹤0.01% 9808
2020
Q1 		– Sell
-32,176
Closed -$71K – 10905
2019
Q4 		$71K Sell
32,176
-12,516
-28% -$22.4K ﹤0.01% 9252
2019
Q3 		$111K Sell
44,692
-26,616
-37% -$126K ﹤0.01% 9509
2019
Q2 		$491K Buy
71,308
+46,284
+185% +$588K ﹤0.01% 7303
2019
Q1 		$417K Buy
+25,024
New +$534K ﹤0.01% 6620

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
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.91% 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

Jeff Yass's TUSK Position: Q2 2026 in Review

Jeff Yass increased its Mammoth Energy Services (TUSK) stake by 38% in Q2 2026, buying an estimated $39.8K and bringing the position to 49,920 shares worth $162K. The position accounts for ﹤0.01% of the portfolio, ranked #12141.

Jeff Yass first reported a position in TUSK in Q1 2019 and has held it in 27 quarters since. The position peaked at $666K in Q4 2022. 94 funds tracked by Wall St. Rank hold TUSK as of Q2 2026.

  • Jeff Yass held 49,920 shares of Mammoth Energy Services worth $162K as of Q2 2026.
  • Jeff Yass bought 13,621 Mammoth Energy Services shares in Q2 2026, an estimated $39.8K.
  • Mammoth Energy Services made up ﹤0.01% of Jeff Yass's portfolio in Q2 2026, its #12141 holding.
  • Jeff Yass first reported a position in Mammoth Energy Services in Q1 2019 and has held it in 27 quarters since.
  • Jeff Yass's Mammoth Energy Services position peaked at $666K in Q4 2022.
  • 94 funds tracked by Wall St. Rank held Mammoth Energy Services as of Q2 2026.

Based on Susquehanna International Group's 13F filing for Q2 2026, filed 14 Aug 2026.