MARTINGALE ASSET MANAGEMENT L P

Position in GPOR — Gulfport Energy Corp

CIK 936944 BOSTON, MA

Position in GPOR

as of Jun 30, 2026 · filed Aug 13, 2026 Compact

Position Value

$3,582,536

+$2,248,588 QoQ

Shares Held

21,111

+234.8% QoQ

Ownership

0.119%

of shares outstanding

% of Portfolio

0.09%

of 13F equity value

Holder Rank

#98

of 291 holders

Holding Since

Jun 2023

13 quarters on record

Voting authority Sole 67% Shared 0% None 33%

Energy · as of Jun 30, 2026

MARTINGALE ASSET MANAGEMENT L P holds $24,771,484 across 12 Oil & Gas E&P names. GPOR ranks #3 (14.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	EXE	EXPAND ENERGY Corp	65,801	$6,000,393
2	COP	Conocophillips	53,357	$5,546,993
3	GPOR	Gulfport Energy Corp This page	21,111	$3,582,536
4	TALO	Talos Energy Inc.	207,800	$2,682,698
5	REPX	Riley Exploration Permian, Inc.	55,466	$1,828,159
6	SM	SM Energy Co	58,300	$1,521,630
7	EQT	EQT Corp	25,697	$1,366,309
8	APA	APA Corp	22,534	$733,932

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$3,582,536	21,111	+234.8%	Shares	Sole	2026-08-13
2026-03-31	$1,333,948	6,305	-5.8%	Shares	Sole	2026-05-13
2025-12-31	$1,392,492	6,695	-1.2%	Shares	Sole	2026-02-13
2025-09-30	$1,226,138	6,775	-5.2%	Shares	Sole	2025-11-13
2025-06-30	$1,437,358	7,145	-0.1%	Shares	Sole	2025-08-11
2025-03-31	$1,316,416	7,149	+53.1%	Shares	Sole	2025-05-14
2024-12-31	$860,029	4,669	-37.5%	Shares	Sole	2025-02-13
2024-09-30	$1,130,130	7,467	-44.9%	Shares	Sole	2024-11-14
2024-06-30	$2,045,144	13,544	-30.8%	Shares	Sole	2024-08-12
2024-03-31	$3,132,747	19,565	+2.6%	Shares	Sole	2024-05-14
2023-12-31	$2,539,857	19,068	+29.2%	Shares	Sole	2024-02-12
2023-09-30	$1,751,658	14,762	+81.2%	Shares	Sole	2023-11-14
2023-06-30	$856,005	8,147	—	Shares	Sole	2023-08-11
No filing history on record for this holder in this stock.