OBERWEIS ASSET MANAGEMENT INC/

Position in MTDR — Matador Resources Co

CIK 937886 LISLE, IL

Position in MTDR

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$15,640,876

-$4,115,510 QoQ

Shares Held

314,200

+0.5% QoQ

Ownership

0.254%

of shares outstanding

% of Portfolio

0.33%

of 13F equity value

Holder Rank

#65

of 489 holders

Holding Since

Sep 2022

16 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Energy · as of Jun 30, 2026

OBERWEIS ASSET MANAGEMENT INC/ holds $27,317,276 across 2 Oil & Gas E&P names. MTDR ranks #1 (57.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	MTDR	Matador Resources Co This page	314,200	$15,640,876
2	MGY	Magnolia Oil & Gas Corp	456,466	$11,676,400

16 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$15,640,876	314,200	+0.5%	Shares	Sole	2026-08-14
2026-03-31	$19,756,386	312,700	+23.2%	Shares	Sole	2026-05-15
2025-12-31	$10,775,516	253,900	0.0%	Shares	Sole	2026-02-17
2025-09-30	$11,407,727	253,900	0.0%	Shares	Sole	2025-11-17
2025-06-30	$12,116,108	253,900	+44.8%	Shares	Sole	2025-08-14
2025-03-31	$8,956,077	175,300	+21.1%	Shares	Sole	2025-05-15
2024-12-31	$8,146,448	144,800	+5.8%	Shares	Sole	2025-02-14
2024-09-30	$6,765,598	136,900	+23.2%	Shares	Sole	2024-11-14
2024-06-30	$6,621,560	111,100	+34.8%	Shares	Sole	2024-08-14
2024-03-31	$5,501,848	82,400	+56.1%	Shares	Sole	2024-05-15
2023-12-31	$3,002,208	52,800	+8.6%	Shares	Sole	2024-02-14
2023-09-30	$2,890,728	48,600	+26.9%	Shares	Sole	2023-11-14
2023-06-30	$2,003,856	38,300	+2.4%	Shares	Sole	2023-08-14
2023-03-31	$1,782,110	37,400	+23.4%	Shares	Sole	2023-05-15
2022-12-31	$1,734,372	30,300	+142.4%	Shares	Sole	2023-02-14
2022-09-30	$611,500	12,500	—	Shares	Sole	2022-11-14
No filing history on record for this holder in this stock.