Mattern Capital Management, LLC has filed a Form 13F-HR report disclosing equity securities held as of September 30, 2026. The filing lists 166 separate positions held by the firm, with a total value of approximately $8,558,884,499.
The report indicates that all positions are held as sole voting power, with no shared voting or dispositive power reported for any of the securities listed.
The largest holding disclosed in the filing is Aflac Inc., for which the firm holds 10,774,400 shares. Other significant positions include Abbott Laboratories (10,515,900 shares), Advanced Micro Devices Inc. (491,000 shares), Alphabet Inc. Class C (7,936,000 shares), and Alphabet Inc. Class A (1,595,000 shares). The filing also lists substantial positions in Amazon.com Inc. (15,164,000 shares), American Express Co. (5,063,000 shares), and American Water Works Co. Inc. (81,644,000 shares).
Among the technology sector holdings, Mattern Capital lists Microsoft Corporation (19,697,230 shares), NVIDIA Corporation (1,925,488 shares), Meta Platforms Inc. (2,551,000 shares), and Apple Inc. (71,134,000 shares). The firm also holds stakes in Prologis Inc. (9,186,467 shares), Eli Lilly & Co. (11,038,543 shares), and UnitedHealth Group Inc. (12,451,115 shares).
The portfolio includes a mix of individual stocks and exchange-traded funds. Notable ETF holdings include the Vanguard S&P 500 ETF (7,338,004 shares), the Invesco QQQ Trust (4,017,691 shares), and the iShares Core S&P 500 ETF (788,826 shares). The filing also lists positions in various other companies, including Walmart Inc., Costco Wholesale Corporation, Johnson & Johnson, and Visa Inc.
