ADTRAN Holdings, Inc. (ADTN) Institutional Ownership

Ownership Summary

ADTRAN Holdings, Inc. (NASDAQ:ADTN) showed up in the 13F filings of 223 institutional investors as of March 2026.

• Collectively, these holders controlled 9872.9% of ADTRAN Holdings's outstanding shares in March 2026, up from 8804.5% in December 2025.
• Their total shares held in ADTN increased 34.88% from the prior quarter, while the number of investors in ADTRAN Holdings increased 9.31% year over year.
• Activity in ADTN broke down as 131 buyers, 65 sellers, and 27 unchanged among 223 total holders.
• Altogether, these fund groups held 79.77Mn shares in ADTN by March 2026, up by 20.63Mn shares quarter on quarter, and up 19.27Mn shares year over year.
• As of March 31, 2026, the biggest holder of ADTRAN Holdings is BlackRock, Inc. at 7.84Mn shares, representing 970.33% of shares outstanding.
• Leading buyers of ADTRAN Holdings shares for the quarter ending March 2026 were VANGUARD PORTFOLIO MANAGEMENT LLC (4.77Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.43Mn), First Eagle Investment Management, LLC (1.5Mn), Shannon River Fund Management LLC (1.22Mn), Boston Partners (1.18Mn).
• Leading sellers of ADTRAN Holdings shares for the quarter ending March 2026 were Divisar Capital Management LLC (1.22Mn), MILLENNIUM MANAGEMENT LLC (798.39K), Kovack Advisors, Inc. (771.1K), Assenagon Asset Management S.A. (671.1K), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (489.09K).
• Per Business Quant data, the top 10 holders of ADTRAN Holdings for the quarter ending March 2026 are BlackRock, Inc. (7.84Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (4.77Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.43Mn), ROYCE & ASSOCIATES LP (3.13Mn), DnB Asset Management AS (3.12Mn), First Eagle Investment Management, LLC (2.74Mn), State Street Corp (2.35Mn), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (1.99Mn), MILLENNIUM MANAGEMENT LLC (1.9Mn), Morgan Stanley (1.83Mn).