Avantor, Inc. (AVTR) Ownership
AVTR ownership summary
as of October 18, 2026- Institutions
- 105.7% of shares outstanding
- Insiders
- 1.53% of shares outstanding
- Shares outstanding
- 676.4M
- Float
- 657.8M shares available to trade
- Short interest
- 7.06% 39.3M shares short
- Days to cover
- 4.47 short interest down 21.6% vs prior month
- Institutions 105.68%
- Insiders 1.53%
AVTR top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Dodge & Cox | 17.75% | 120.0M | $1.97B | +372,645 (+0.3%) | June 30, 2026 |
| 2 | BlackRock Inc | 10.39% | 70.3M | $1.15B | +4.6M (+7.0%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 4.63% | 31.3M | $514.7M | +67,403 (+0.2%) | June 30, 2026 |
| 4 | Vanguard Capital Management, LLC | 4.55% | 30.8M | $505.8M | +196,723 (+0.6%) | June 30, 2026 |
| 5 | Greenhaven Associates Inc | 3.64% | 24.6M | $404.5M | +2.0M (+9.0%) | June 30, 2026 |
| 6 | State Street Corp | 3.19% | 21.6M | $354.2M | +851,895 (+4.1%) | June 30, 2026 |
| 7 | Dimensional Fund Advisors, Inc. | 3.02% | 20.4M | $335.2M | +3.5M (+20.8%) | June 30, 2026 |
| 8 | Engine Capital Management LP | 2.94% | 19.9M | $326.1M | +80,000 (+0.4%) | June 30, 2026 |
| 9 | Barrow Hanley Mewhinney & Strauss LLC | 2.92% | 19.7M | $324.1M | −2.6M (−11.7%) | June 30, 2026 |
| 10 | New Mountain Capital, L.L.C. | 2.07% | 14.0M | $229.9M | — | June 30, 2026 |
| 11 | Amvescap Plc. | 2.05% | 13.9M | $228.0M | +5.8M (+72.0%) | June 30, 2026 |
| 12 | Geode Capital Management, LLC | 1.95% | 13.2M | $216.4M | +289,146 (+2.2%) | June 30, 2026 |
| 13 | Marshall Wace Asset Management Ltd | 1.94% | 13.1M | $215.6M | +9.7M (+281.9%) | June 30, 2026 |
| 14 | AQR Capital Management LLC | 1.72% | 11.6M | $190.9M | +6.8M (+138.9%) | June 30, 2026 |
| 15 | Bank of America Corp | 1.62% | 11.0M | $180.4M | +3.9M (+55.5%) | June 30, 2026 |
| 16 | Earnest Partners LLC | 1.59% | 10.7M | $176.5M | +4.7M (+78.4%) | June 30, 2026 |
| 17 | London Company of Virginia | 1.55% | 10.5M | $172.2M | −366,297 (−3.4%) | June 30, 2026 |
| 18 | Fuller & Thaler Asset Management Inc | 1.52% | 10.3M | $168.4M | −375,767 (−3.5%) | June 30, 2026 |
| 19 | D. E. Shaw & Co LP | 1.42% | 9.6M | $157.2M | −3.5M (−27.0%) | June 30, 2026 |
| 20 | First Pacific Advisors, LP | 1.21% | 8.2M | $134.5M | +101,717 (+1.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 15 holders added 43.0M shares and 4 cut 6.9M.
AVTR top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Dodge & Cox Stock I | 11.07% | 74.9M | $1.23B | — | June 30, 2026 |
| 2 | iShares Core S&P Mid-Cap ETF | 3.56% | 24.1M | $395.6M | −8,604 (−0.0%) | September 30, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 3.21% | 21.7M | $356.8M | −25,655 (−0.1%) | August 31, 2026 |
| 4 | Vanguard Small Cap Index | 2.32% | 15.7M | $258.0M | +17,023 (+0.1%) | August 31, 2026 |
| 5 | Bridge Builder Large Cap Value | 1.83% | 12.4M | $202.9M | — | September 30, 2026 |
| 6 | Invesco Small Cap Value A | 1.51% | 10.2M | $167.8M | +605,780 (+6.3%) | August 31, 2026 |
| 7 | Vanguard MStar Small Cap Value Index | 1.48% | 10.0M | $163.8M | +7,754 (+0.1%) | August 31, 2026 |
| 8 | Touchstone Mid Cap Y | 1.41% | 9.5M | $156.3M | −586,543 (−5.8%) | June 30, 2026 |
| 9 | Undiscovered Managers Behavioral Val L | 1.19% | 8.0M | $131.9M | −179,500 (−2.2%) | August 31, 2026 |
| 10 | Dodge & Cox Global Stock I | 1.15% | 7.8M | $127.4M | — | June 30, 2026 |
| 11 | DFA US Small Cap Value I | 1.03% | 7.0M | $114.2M | +13,424 (+0.2%) | August 31, 2026 |
| 12 | Dodge & Cox Balanced I | 0.93% | 6.3M | $103.7M | — | June 30, 2026 |
| 13 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.74% | 5.0M | $82.0M | −56,260 (−1.1%) | August 31, 2026 |
| 14 | FPA Crescent | 0.72% | 4.9M | $79.8M | +1,862 (+0.0%) | June 30, 2026 |
| 15 | AMG Yacktman I | 0.67% | 4.5M | $73.9M | — | June 30, 2026 |
| 16 | Longleaf Partners | 0.65% | 4.4M | $72.4M | +1.3M (+42.9%) | June 30, 2026 |
| 17 | Dodge & Cox Worldwide Global Stk USD Acc | 0.58% | 3.9M | $64.5M | — | June 30, 2026 |
| 18 | State Street SPDR Port S&P 400 Md CpETF | 0.53% | 3.6M | $58.7M | −5,032 (−0.1%) | September 30, 2026 |
| 19 | iShares S&P Mid-Cap 400 Value ETF | 0.52% | 3.5M | $57.4M | — | September 30, 2026 |
| 20 | Fidelity Extended Market Index | 0.49% | 3.3M | $54.8M | +157,865 (+5.0%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AVTR insider transactions
latest 15| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-10 | Sanjeev K Mehra | Buy | $8.01 | 125,000 | $1.0M |
| 2026-02-19 | Gregory T Lucier | Buy | $9.16 | 50,000 | $458,000 |
| 2026-02-12 | Gregory L Summe | Buy | $9.40 | 100,000 | $940,000 |
| 2025-12-05 | Sanjeev K Mehra | Buy | $11.09 | 350,000 | $3.9M |
| 2025-10-30 | Gregory L Summe | Buy | $11.25 | 100,000 | $1.1M |
| 2025-08-13 | Gilbert Ray Cisneros, Jr. | Sell | $13.08 | — | — |
| 2025-08-12 | Gilbert Ray Cisneros, Jr. | Sell | $12.65 | — | — |
| 2025-08-05 | Steven W Eck | Sell | $11.39 | 3,476 | $39,592 |
| 2025-07-23 | Gilbert Ray Cisneros, Jr. | Sell | $13.60 | — | — |
| 2025-06-17 | Lisa C. McClain | Sell | $13.16 | — | — |
| 2025-06-11 | Lisa C. McClain | Buy | $13.55 | — | — |
| 2025-05-23 | Gregory L Summe | Buy | $12.50 | 30,000 | $375,000 |
| 2025-05-22 | Gregory L Summe | Buy | $12.65 | 20,000 | $253,000 |
| 2025-05-07 | Gregory L Summe | Buy | $12.00 | 25,000 | $300,000 |
| 2025-04-29 | Joseph R Massaro | Buy | $12.30 | 8,100 | $99,630 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
AVTR shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns AVTR
Institutional investors own 105.7% of Avantor's shares and insiders 1.53%. The largest holder is Dodge & Cox with 17.75% of the shares (120.0M), as of June 30, 2026. Among the top 20 institutions, 15 added shares and 4 reduced their stake in the latest filings. Short interest is 7.06% of the float, or 4.47 days of average trading volume. The share count rose 69.9% since 2017.
Related: AVTR analyst forecast, AVTR key metrics. See the AVTR stock overview for the latest quote and news.
AVTR ownership FAQ
Who owns the most Avantor stock?
The largest shareholders of Avantor are Dodge & Cox (17.75%), BlackRock Inc (10.39%), Vanguard Portfolio Management, LLC (4.63%), Vanguard Capital Management, LLC (4.55%), Greenhaven Associates Inc (3.64%).
What percentage of Avantor is owned by institutions?
Institutions hold 105.7% of Avantor's shares outstanding; insiders hold 1.53%.
Which funds own Avantor?
The largest fund holders of Avantor are Dodge & Cox Stock I (11.07%), iShares Core S&P Mid-Cap ETF (3.56%), Vanguard MStar Total Stk Mkt Idx Invest (3.21%), Vanguard Small Cap Index (2.32%), Bridge Builder Large Cap Value (1.83%).
What is Avantor's short interest?
39.3M shares of Avantor were sold short, 7.06% of the float; at the average daily volume it would take 4.47 days to cover.
Are insiders buying or selling Avantor?
Of the latest 15 reported insider transactions in Avantor (since April 29, 2025), 10 were purchases and 5 were sales.
How many shares of Avantor are outstanding?
Avantor has 676.4M shares outstanding, of which 657.8M are in the public float.