Penbrook Management’s Mammoth Energy Services TUSK Stock Holding History

Penbrook Management’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
2025 Q3	–	Sell	-27,000	Closed	-$65K	–	119
2025 Q2	$65K	Buy	27,000 +13,000	+93%	+$33.3K	0.02%	107
2025 Q1	$28.6K	Sell	14,000 -8,200	-37%	-$21.9K	0.02%	106
2024 Q4	$66.6K	Sell	22,200 -10,500	-32%	-$38.7K	0.05%	106
2024 Q3	$134K	Sell	32,700 -29,200	-47%	-$107K	0.09%	99
2024 Q2	$203K	Sell	61,900 -3,000	-5%	-$10.3K	0.12%	91
2024 Q1	$236K	Sell	64,900 -12,000	-16%	-$45.2K	0.15%	93
2023 Q4	$343K	Sell	76,900 -4,000	-5%	-$17.7K	0.23%	78
2023 Q3	$375K	Sell	80,900 -400	-0.5%	-$1.95K	0.28%	74
2023 Q2	$393K	Hold	81,300	–	–	0.28%	74
2023 Q1	$343K	Buy	+81,300	New	+$484K	0.26%	73

Other funds holding TUSK

Wexford Capital West Palm Beach, Florida $690M AUM 57.92% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $64.8B AUM 42.7% 1-Year Est. Return

ValueWorks New York $367M AUM 59.38% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

BCM

Bridgeway Capital Management Houston, Texas $4.97B AUM 44.96% 1-Year Est. Return

Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Penbrook Management's TUSK Position: Q3 2025 in Review

Penbrook Management sold out of Mammoth Energy Services (TUSK) in Q3 2025, closing a stake of 27,000 shares — an estimated $65K sold.

Penbrook Management first reported a position in TUSK in Q1 2023 and held it in 10 quarters. The position peaked at $393K in Q2 2023. 77 funds tracked by Wall St. Rank hold TUSK as of Q3 2025.

Penbrook Management reported no remaining Mammoth Energy Services position as of Q3 2025 after selling out during the quarter.
Penbrook Management sold 27,000 Mammoth Energy Services shares in Q3 2025, an estimated $65K.
Penbrook Management first reported a position in Mammoth Energy Services in Q1 2023 and held it in 10 quarters.
Penbrook Management's Mammoth Energy Services position peaked at $393K in Q2 2023.
77 funds tracked by Wall St. Rank held Mammoth Energy Services as of Q3 2025.

Based on Penbrook Management's 13F filing for Q3 2025, filed 22 Oct 2025.