Vestmark Advisory Reduces Diamondback Energy Stake

Investment firm cuts position in oil and gas company by over 80%

Published on Mar. 2, 2026

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Vestmark Advisory Solutions Inc. has lowered its position in Diamondback Energy, Inc. (NASDAQ:FANG) by 80.6% during the third quarter, according to a recent SEC filing. The investment firm now owns 1,569 shares of the oil and natural gas company's stock, down from 8,103 shares previously.

Why it matters

Diamondback Energy is a major independent oil and gas producer focused on the Permian Basin. Changes in institutional ownership of the company's stock can signal shifts in investor sentiment and outlook for the industry.

The details

Vestmark Advisory Solutions sold 6,534 shares of Diamondback Energy during the third quarter, reducing its total position to 1,569 shares worth approximately $225,000 as of the latest filing. The firm cited unspecified portfolio management decisions as the reason for the significant reduction in its Diamondback Energy holdings.

  • Vestmark Advisory Solutions filed its latest 13F report covering the third quarter of 2026.

The players

Vestmark Advisory Solutions Inc.

An investment advisory firm that manages portfolios for individual and institutional clients.

Diamondback Energy, Inc.

An independent oil and natural gas company focused on the Permian Basin in West Texas and southeastern New Mexico.

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The takeaway

The sizable reduction in Vestmark Advisory's Diamondback Energy position suggests the firm sees near-term challenges or risks for the oil and gas producer, though the specific reasons are not disclosed. Investors will be watching to see if other major institutional holders make similar moves in the coming quarters.