AVANTOR INC (AVTR) Institutional Buying Activity
Institutional investors tracked by InsiderSet increased exposure to AVANTOR INC (AVTR) during the quarter ended March 31, 2026 through a combination of new purchases and expanded existing positions disclosed in SEC Form 13F filings.
The largest institutional buyer of AVTR during the latest reporting period was Dodge & Cox Stock Fund, which increased its reported AVTR position by approximately $1.09B based on quarter-end filing values. Several additional hedge funds and long-term asset managers also reported meaningful increases in AVTR exposure during the quarter.
Institutional buying activity can provide insight into investor conviction, sector allocation trends, and smart money positioning toward AVANTOR INC (AVTR). InsiderSet tracks quarterly accumulation trends, new institutional positions, ownership increases, and estimated performance of newly disclosed holdings using SEC filing data and recent market prices.
The investors highlighted on this page collectively added approximately $3.29B in reported AVTR exposure during the latest filing period, reflecting continued institutional interest in AVANTOR INC's growth initiatives and strategic positioning.
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q1 2026 | Yacktman Asset Management | Buy | 4,745,000 | 4,745,000 | $37,200,800 |
| Q1 2026 | Dodge & Cox Stock Fund | Buy | 2,583,186 | 119,648,329 | $938,042,899 |
| Q1 2026 | Greenhaven Associates | Buy | 2,093,185 | 22,593,838 | $177,135,690 |
| Q1 2026 | Olstein Capital Management | Buy | 392,000 | 1,210,000 | $9,486 |
| Q4 2025 | Greenhaven Associates | Buy | 2,189,083 | 20,500,653 | $234,937,483 |
| Q4 2025 | Olstein Capital Management | Buy | 24,000 | 818,000 | $9,374 |
| Q3 2025 | Greenhaven Associates | Buy | 18,311,570 | 18,311,570 | $228,528,394 |
| Q3 2025 | Longleaf Partners | Buy | 5,149,420 | 5,149,420 | $64,264,762 |
| Q3 2025 | Renaissance Technologies LLC | Buy | 416,200 | 1,651,100 | $20,605,728 |
| Q3 2025 | Dodge & Cox Stock Fund | Buy | 313,404 | 117,746,888 | $1,469,481,162 |
| Q3 2025 | Olstein Capital Management | Buy | 115,000 | 794,000 | $9,909 |
| Q3 2025 | Sequoia Financial Advisors | Buy | 267 | 15,981 | $199,447 |
| Q2 2025 | Dodge & Cox Stock Fund | Buy | 17,170,761 | 117,433,484 | $1,580,654,695 |
| Q2 2025 | Renaissance Technologies LLC | Buy | 909,400 | 1,234,900 | $16,621,754 |
| Q2 2025 | Olstein Capital Management | Buy | 111,000 | 679,000 | $9,139 |
| Q2 2025 | Sequoia Financial Advisors | Buy | 5,850 | 15,714 | $211,513 |
| Q1 2025 | Dodge & Cox Stock Fund | Buy | 1,116,953 | 100,262,723 | $1,625,258,740 |
| Q1 2025 | Olstein Capital Management | Buy | 212,000 | 568,000 | $9,207 |
| Q4 2024 | Dodge & Cox Stock Fund | Buy | 30,727,673 | 99,145,770 | $2,089,001,374 |
| Q4 2024 | Sound Shore Management | Buy | 1,159,426 | 4,681,535 | $98,639,943 |
| Q4 2024 | Olstein Capital Management | Buy | 121,000 | 356,000 | $7,501 |
| Q3 2024 | Dodge & Cox Stock Fund | Buy | 3,053,907 | 68,418,097 | $1,769,976,169 |
| Q3 2024 | Durable Capital Partners | Buy | 1,954,253 | 7,992,098 | $206,755,575 |
| Q3 2024 | Sequoia Financial Advisors | Buy | 9,864 | 9,864 | $255,182 |
| Q3 2024 | First Eagle U.S. Value | Buy | 2,100 | 20,582 | $532,456 |
| Q2 2024 | Dodge & Cox Stock Fund | Buy | 1,683,884 | 65,364,190 | $1,385,720,828 |
| Q2 2024 | First Eagle U.S. Value | Buy | 2,600 | 18,482 | $391,819 |
| Q1 2024 | Durable Capital Partners | Buy | 8,499,352 | 8,499,352 | $217,328,431 |
| Q1 2024 | Dodge & Cox Stock Fund | Buy | 2,483,975 | 63,680,306 | $1,628,305,424 |
| Q4 2023 | Dodge & Cox Stock Fund | Buy | 47,904,427 | 61,196,331 | $1,397,112,237 |
Frequently asked questions about AVTR activity
Which institutional owners are buying AVTR?
Institutional owners buying AVTR include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in AVTR activity?
"Buy" means an investor increased their reported position in AVTR compared to the prior reporting period. This reflects growing exposure to AVANTOR INC (AVTR) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in AVTR increasing?
Institutional interest in AVTR can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.