Avantor, Inc. (AVTR) Institutional Ownership

Ownership Summary

A total of 140 institutions have reported a stake in Avantor, Inc. (NYSE:AVTR) as of December 2025, according to recent 13F filings with the SEC.

• The percentage of Avantor owned by institutions changed from 107.4% in September 2025 to 19.8% in December 2025, marking a slight down trend.
• Institutional share ownership changed by 3.49% QoQ, while the number of institutional owners saw a decrease of 71.13% YoY.
• During the quarter, 50 institutions bought more Avantor shares, 65 sold shares, and 25 of the 140 total investors held their position steady.
• The aggregate institutional position in Avantor now stands at 124.90Mn shares as of December 2025, after investors increased their holdings (up by 4.21Mn shares quarter on quarter which is down 550.53Mn shares year over year).
• As of December 31, 2025, VANGUARD GROUP INC held Avantor's largest shareholding position with over 64.90Mn shares, representing 10.26% of total outstanding shares.
• Among the most significant buyers of Avantor during December 2025 were Assenagon Asset Management S.A. (3.62Mn), UBS Group AG (3.57Mn), GREENHAVEN ASSOCIATES INC (2.19Mn), SG Americas Securities, LLC (272.09K), AMG National Trust Bank (138.31K).
• Leading sellers of Avantor stock in December 2025 included THRIVENT FINANCIAL FOR LUTHERANS (2.59Mn), VANGUARD GROUP INC (1.08Mn), Robeco Schweiz AG (639.22K), Lightrock Netherlands B.V. (287.91K), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (287.68K).
• The top 10 institutional holders of Avantor for the quarter ending December 2025 included VANGUARD GROUP INC (64.90Mn), GREENHAVEN ASSOCIATES INC (20.50Mn), UBS Group AG (7.73Mn), Robeco Schweiz AG (7.28Mn), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (7.21Mn), Assenagon Asset Management S.A. (3.62Mn), Perpetual Ltd (1.83Mn), PRINCIPAL FINANCIAL GROUP INC (1.47Mn), Retirement Systems of Alabama (818.29K), Olstein Capital Management, L.P. (818.00K).