Mattern Capital Management, LLC has disclosed its latest 13F-HR filing, revealing a total portfolio value of approximately $855.9 million as of September 30, 2026. This update is significant as it provides insight into the firm’s investment strategies and market positioning.

The filing, submitted on November 2, 2026, indicates that Mattern Capital Management continues to actively manage its investments, with a total of 166 reported positions. The firm’s approach reflects a commitment to navigating the complexities of the current financial landscape.

Background

Mattern Capital Management, LLC is a registered investment advisor based in Lakewood, Colorado. The firm operates under the Central Index Key (CIK) number 0001803227. While the specific Standard Industrial Classification (SIC) description is not provided in the filing, the firm is categorized under asset management.

Recent filings from Mattern Capital include the 13F-HR on November 2, 2026, and prior filings such as the N-PX on August 11, 2026, and another 13F-HR on July 24, 2026. These filings demonstrate the firm’s ongoing regulatory compliance and transparency in reporting its investment activities.

What the Filing Says

The 13F-HR filing reveals that Mattern Capital Management holds a diverse portfolio valued at $855,888,499. The report includes detailed information about the firm’s holdings, although specific changes in stock positions were not disclosed in the filing.

Impact

This filing may affect various stakeholders, including investors, analysts, and competitors in the asset management industry. By revealing its portfolio size and composition, Mattern Capital Management provides valuable insights that could influence market perceptions and investment strategies among peers.

What's Next

The filing does not specify what happens next for Mattern Capital Management, but the firm is expected to continue monitoring its investments and may file additional reports in the future.

Source: SEC Accession Number 0001725547-26-000386