WESTFIELD CAPITAL MANAGEMENT CO LP

Position in FANG — Diamondback Energy, Inc.

CIK 1177719 BOSTON, MA

Position in FANG

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$37,389,988

-$62,192,134 QoQ

Shares Held

212,709

-57.8% QoQ

Ownership

0.076%

of shares outstanding

% of Portfolio

0.12%

of 13F equity value

Holder Rank

#92

of 1,183 holders

Holding Since

Jun 2021

21 quarters on record

Voting authority Sole 90% Shared 0% None 10%

Energy · as of Jun 30, 2026

WESTFIELD CAPITAL MANAGEMENT CO LP holds $143,940,024 across 3 Oil & Gas E&P names. FANG ranks #2 (26.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PR	Permian Resources Corp	5,756,888	$105,984,308
2	FANG	Diamondback Energy, Inc. This page	212,709	$37,389,988
3	EQT	EQT Corp	10,640	$565,728

21 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$37,389,988	212,709	-57.8%	Shares	Sole	2026-08-12
2026-03-31	$99,582,122	503,474	+42.0%	Shares	Sole	2026-05-11
2025-12-31	$53,315,286	354,655	+10.9%	Shares	Sole	2026-02-11
2025-09-30	$45,743,918	319,664	-5.1%	Shares	Sole	2025-11-12
2025-06-30	$46,261,618	336,693	-2.3%	Shares	Sole	2025-08-12
2025-03-31	$55,094,008	344,596	+16.5%	Shares	Sole	2025-05-09
2024-12-31	$48,475,003	295,886	-2.2%	Shares	Sole	2025-02-11
2024-09-30	$52,141,345	302,444	-13.2%	Shares	Sole	2024-11-12
2024-06-30	$69,787,835	348,608	+0.9%	Shares	Sole	2024-08-14
2024-03-31	$68,494,487	345,635	-1.8%	Shares	Sole	2024-05-10
2023-12-31	$54,574,823	351,914	+32.9%	Shares	Sole	2024-02-09
2023-09-30	$41,010,830	264,791	-53.7%	Shares	Sole	2023-11-13
2023-06-30	$75,101,270	571,721	-12.1%	Shares	Sole	2023-08-11
2023-03-31	$87,952,415	650,680	-1.3%	Shares	Sole	2023-05-12
2022-12-31	$90,181,379	659,317	+0.3%	Shares	Sole	2023-02-13
2022-09-30	$79,217,025	657,621	+1.3%	Shares	Sole	2022-11-14
2022-06-30	$78,613,023	648,890	+35.4%	Shares	Sole	2022-08-12
2022-03-31	$65,685,720	479,178	+2.3%	Shares	Sole	2022-05-16
2021-12-31	$50,517,694	468,407	-10.3%	Shares	Sole	2022-02-10
2021-09-30	$49,422,757	522,053	+8.7%	Shares	Sole	2021-11-12
2021-06-30	$45,104,662	480,399	—	Shares	Sole	2021-08-10
No filing history on record for this holder in this stock.