Boston Partners
TUSK icon

Boston Partners’s Mammoth Energy Services TUSK Stock Holding History

Boston Partners’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 		$224K Sell
68,935
-85,453
-55% -$250K ﹤0.01% 792
2026
Q1 		$378K Buy
+154,388
New +$351K ﹤0.01% 707
2023
Q4 		– Sell
-35,093
Closed -$163K – 778
2023
Q3 		$163K Sell
35,093
-27,093
-44% -$132K ﹤0.01% 708
2023
Q2 		$300K Buy
62,186
+21,758
+54% +$90.1K ﹤0.01% 671
2023
Q1 		$171K Sell
40,428
-4,645
-10% -$27.7K ﹤0.01% 678
2022
Q4 		$390K Hold
45,073
– – ﹤0.01% 624
2022
Q3 		$154K Sell
45,073
-27,079
-38% -$94.4K ﹤0.01% 683
2022
Q2 		$159K Sell
72,152
-70,110
-49% -$157K ﹤0.01% 679
2022
Q1 		$303K Buy
142,262
+79,561
+127% +$144K ﹤0.01% 653
2021
Q4 		$114K Sell
62,701
-13,677
-18% -$35.7K ﹤0.01% 679
2021
Q3 		$222K Buy
76,378
+28,653
+60% +$102K ﹤0.01% 651
2021
Q2 		$219K Buy
+47,725
New +$197K ﹤0.01% 645
2020
Q1 		– Sell
-252,015
Closed -$555K – 748
2019
Q4 		$555K Sell
252,015
-127,467
-34% -$229K ﹤0.01% 621
2019
Q3 		$941K Sell
379,482
-580,225
-60% -$2.75M ﹤0.01% 588
2019
Q2 		$6.6M Buy
959,707
+495,089
+107% +$6.29M 0.01% 399
2019
Q1 		$7.74M Sell
464,618
-436,202
-48% -$9.31M 0.01% 393
2018
Q4 		$16.2M Buy
900,820
+649,972
+259% +$16M 0.02% 338
2018
Q3 		$7.3M Buy
250,848
+99,783
+66% +$3.29M 0.01% 405
2018
Q2 		$5.13M Buy
151,065
+66,965
+80% +$2.35M 0.01% 456
2018
Q1 		$2.7M Sell
84,100
-66,940
-44% -$1.67M ﹤0.01% 607
2017
Q4 		$2.96M Buy
151,040
+2,771
+2% +$50.5K ﹤0.01% 613
2017
Q3 		$2.5M Buy
148,269
+99,340
+203% +$1.45M ﹤0.01% 638
2017
Q2 		$910K Sell
48,929
-7,071
-13% -$132K ﹤0.01% 703
2017
Q1 		$1.21M Buy
56,000
+8,400
+18% +$160K ﹤0.01% 694
2016
Q4 		$724K Buy
+47,600
New +$704K ﹤0.01% 720

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 40.89% 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

Boston Partners's TUSK Position: Q2 2026 in Review

Boston Partners reduced its Mammoth Energy Services (TUSK) stake by 55% in Q2 2026, selling an estimated $250K and leaving 68,935 shares worth $224K. The position accounts for ﹤0.01% of the portfolio, ranked #792.

Boston Partners first reported a position in TUSK in Q4 2016 and has held it in 25 quarters since. The position peaked at $16.2M in Q4 2018. 94 funds tracked by Wall St. Rank hold TUSK as of Q2 2026.

  • Boston Partners held 68,935 shares of Mammoth Energy Services worth $224K as of Q2 2026.
  • Boston Partners sold 85,453 Mammoth Energy Services shares in Q2 2026, an estimated $250K.
  • Mammoth Energy Services made up ﹤0.01% of Boston Partners's portfolio in Q2 2026, its #792 holding.
  • Boston Partners first reported a position in Mammoth Energy Services in Q4 2016 and has held it in 25 quarters since.
  • Boston Partners's Mammoth Energy Services position peaked at $16.2M in Q4 2018.
  • 94 funds tracked by Wall St. Rank held Mammoth Energy Services as of Q2 2026.

Based on Boston Partners's 13F filing for Q2 2026, filed 4 Aug 2026.