Boston Partners

Position in TUSK — Mammoth Energy Services, Inc.

CIK 1386060 BOSTON, MA

Position in TUSK

as of Mar 31, 2026 · filed May 11, 2026 Compact

Position Value

$378,250

+$215,419 QoQ

Shares Held

154,388

+339.9% QoQ

Ownership

0.321%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2021

11 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Industrials · as of Mar 31, 2026

Boston Partners holds $940,041,552 across 7 Conglomerates names. TUSK ranks #6 (0.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	HON	Honeywell International Inc	3,177,157	$753,154,597
2	MMM	3M Co	1,271,384	$184,643,096
3	RCMT	Rcm Technologies, Inc.	30,003	$574,257
4	CODI	Compass Diversified Holdings	59,717	$469,375
5	TTI	Tetra Technologies Inc	52,546	$447,691
6	TUSK	Mammoth Energy Services, Inc. This page	154,388	$378,250
7	MATW	Matthews International Corp	14,496	$374,286

11 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$378,250	154,388	+339.9%	Shares	Defined	2026-05-11
2023-09-30	$162,831	35,093	-43.6%	Shares	Defined	2023-11-08
2023-06-30	$300,358	62,186	+53.8%	Shares	Defined	2023-08-10
2023-03-31	$170,606	40,428	-10.3%	Shares	Defined	2023-05-09
2022-12-31	$389,881	45,073	0.0%	Shares	Defined	2023-02-08
2022-09-30	$153,698	45,073	-37.5%	Shares	Defined	2022-11-09
2022-06-30	$158,734	72,152	-49.3%	Shares	Defined	2022-08-10
2022-03-31	$303,018	142,262	+126.9%	Shares	Defined	2022-05-10
2021-12-31	$114,115	62,701	-17.9%	Shares	Defined	2022-02-04
2021-09-30	$222,259	76,378	+60.0%	Shares	Defined	2021-11-05
2021-06-30	$219,057	47,725	—	Shares	Defined	2021-08-12
No filing history on record for this holder in this stock.