AVANTOR INC AVTR
COM · Common Stock · CUSIP 05352A100 · ISIN US05352A1007
U.S. chemical company
- SectorTechnology
- IndustryLaboratory Analytical Instruments
- HeadquartersRadnor, PA
- Websiteavantorsciences.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($31.1m this quarter). Holder counts are more reliable. Shares outstanding: 682.1m as of 2026-02-05, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $11.48. Options: 15 managers hold calls ($15.1m notional), 14 hold puts ($52.2m).
Trends to Q4 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 440 |
| Q4 2022 | 445 |
| Q1 2023 | 467 |
| Q2 2023 | 444 |
| Q3 2023 | 441 |
| Q4 2023 | 473 |
| Q1 2024 | 498 |
| Q2 2024 | 517 |
| Q3 2024 | 521 |
| Q4 2024 | 495 |
| Q1 2025 | 487 |
| Q2 2025 | 508 |
| Q3 2025 | 466 |
| Q4 2025 | 421 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2024 | 261 | 198 |
| Q2 2024 | 260 | 225 |
| Q3 2024 | 277 | 242 |
| Q4 2024 | 209 | 289 |
| Q1 2025 | 251 | 230 |
| Q2 2025 | 306 | 209 |
| Q3 2025 | 216 | 314 |
| Q4 2025 | 168 | 294 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2025 | $35.7m | $15.7m | 0.44 |
| Q2 2025 | $43.7m | $28.2m | 0.64 |
| Q3 2025 | $16.8m | $17.4m | 1.03 |
| Q4 2025 | $15.1m | $52.2m | 3.46 |
Biggest buyers
| WELLINGTON MANAGEMENT GROUP LLP | New | +23.4m |
| T. Rowe Price Investment Management, Inc. | Added | +20.4m |
| MORGAN STANLEY | Added | +11.2m |
| D. E. Shaw & Co., Inc. | Added | +4.8m |
| JANE STREET GROUP, LLC | Added | +3.8m |
| Assenagon Asset Management S.A. | New | +3.6m |
| UBS Group AG | Added | +3.6m |
| FULLER & THALER ASSET MANAGEMENT, INC. | New | +3.2m |
| AQR CAPITAL MANAGEMENT LLC | Added | +3.2m |
| Brickwood Asset Management LLP | Added | +3.1m |
Biggest sellers
| Engine Capital Management, LP | Reduced | -7.8m |
| CITADEL ADVISORS LLC | Reduced | -6.7m |
| Holocene Advisors, LP | Sold out | -5.5m |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Reduced | -3.3m |
| ROYAL BANK OF CANADA | Reduced | -2.9m |
| Thrivent Financial for Lutherans | Reduced | -2.6m |
| Point72 Asset Management, L.P. | Sold out | -2.5m |
| JPMORGAN CHASE & CO | Reduced | -2.4m |
| Corient Private Wealth LP | Reduced | -2.3m |
| RENAISSANCE TECHNOLOGIES LLC | Sold out | -1.7m |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $3.6m317.3k shares |
| PEAK6 LLC | New | $3.1m274.0k shares |
| IMC-Chicago, LLC | Added | $1.4m121.5k shares |
| Walleye Capital LLC | Added | $1.2m107.9k shares |
| CAPITAL FUND MANAGEMENT S.A. | Reduced | $1.1m91.7k shares |
| GOLDMAN SACHS GROUP INC | Unchanged | $916.8k80.0k shares |
| Twin Tree Management, LP | New | $774.7k67.6k shares |
| SIMPLEX TRADING, LLC | Reduced | $579.9k50.6k shares |
| GROUP ONE TRADING LLC | Reduced | $504.2k44.0k shares |
| JANE STREET GROUP, LLC | Reduced | $469.9k41.0k shares |
Biggest puts
| TUDOR INVESTMENT CORP ET AL | Added | $20.7m1.8m shares |
| Caption Management, LLC | Added | $13.2m1.1m shares |
| SUMMIT SECURITIES GROUP LLC | New | $5.7m500.0k shares |
| CITADEL ADVISORS LLC | Added | $4.2m367.0k shares |
| Twin Tree Management, LP | Added | $2.0m178.8k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.4m119.8k shares |
| SIMPLEX TRADING, LLC | Reduced | $1.3m110.1k shares |
| GOLDMAN SACHS GROUP INC | Unchanged | $916.8k80.0k shares |
| Walleye Capital LLC | Added | $883.6k77.1k shares |
| JANE STREET GROUP, LLC | Reduced | $806.8k70.4k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| DODGE & COX 13G · institution +2.6 pts · filed 2025-08-13 | 17.2% |
| BlackRock, Inc. 13G · institution filed 2025-10-17 | 8.7% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.3% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD CAPITAL MANAGEMENT LLC), BARROW HANLEY MEWHINNEY & STRAUSS LLC (4.9%, 2026-02-11), T. Rowe Price Investment Management, Inc. (4.8%, 2025-11-14)
Insider purchases and sales in Q4 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q1 2024 | 0 | — | 3 | $687.5k | $94.4k |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 0 | — | 2 | $361.1k | $272.8k |
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 2 | $182.6k | $182.6k |
| Q2 2025 | 4 | $1.5m | 0 | — | — |
| Q3 2025 | 1 | $1.3m | 1 | $39.6k | $39.6k |
| Q4 2025 | 3 | $6.0m | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-12-05 | MEHRA SANJEEV K Director | Bought | $3.9m350.0k shares |
| 2025-11-17 | Ligner Emmanuel President and CEO, director | Bought | $993.1k87.5k shares |
| 2025-10-30 | SUMME GREGORY L Director · By a Trust | Bought | $1.1m100.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q4 2025
| Manager | Shares | Change |
|---|---|---|
| Dodge & Cox 0.72% of their portfolio | 117.1m $1.3bn | Reduced -681.7k |
| VANGUARD GROUP INC 0.01% of their portfolio | 64.9m $743.8m | Reduced -1.1m |
| BlackRock, Inc. 0.01% of their portfolio | 59.6m $683.0m | Reduced -1.1m |
| T. Rowe Price Investment Management, Inc. 0.24% of their portfolio | 53.4m $611.6m | Added +20.4m |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC 1.27% of their portfolio | 33.3m $381.5m | Reduced -1.3m |
| WELLINGTON MANAGEMENT GROUP LLP 0.05% of their portfolio | 23.4m $268.6m | New |
| GREENHAVEN ASSOCIATES INC 3.81% of their portfolio | 20.5m $234.9m | Added +2.2m |
| STATE STREET CORP 0.01% of their portfolio | 20.2m $231.6m | Reduced -156.4k |
| MORGAN STANLEY 0.01% of their portfolio | 17.5m $200.2m | Added +11.2m |
| Invesco Ltd. 0.02% of their portfolio | 17.2m $196.9m | Added +1.1m |
| Clarkston Capital Partners, LLC 4.01% of their portfolio | 15.1m $173.1m | Added +84.7k |
| DIMENSIONAL FUND ADVISORS LP 0.04% of their portfolio | 14.6m $167.4m | Added +1.2m |
| New Mountain Capital, L.L.C. 100.00% of their portfolio | 14.0m $160.4m | Unchanged |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 12.0m $137.3m | Reduced -317.1k |
| LONDON CO OF VIRGINIA 0.79% of their portfolio | 11.9m $136.8m | Reduced -857.4k |
| Engine Capital Management, LP 18.87% of their portfolio | 11.9m $136.7m | Reduced -7.8m |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.08% of their portfolio | 8.7m $100.1m | Reduced -3.3m |
| UBS Group AG 0.02% of their portfolio | 7.7m $88.6m | Added +3.6m |
| FMR LLC 0.00% of their portfolio | 7.7m $87.9m | Added +48.9k |
| Robeco Schweiz AG 1.87% of their portfolio | 7.3m $83.4m | Reduced -639.2k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.03% of their portfolio | 7.2m $82.7m | Reduced -287.7k |
| NORGES BANK 0.01% of their portfolio | 6.4m $73.3m | Not comparable |
| D. E. Shaw & Co., Inc. 0.05% of their portfolio | 6.2m $71.2m | Added +4.8m |
| EARNEST PARTNERS LLC 0.30% of their portfolio | 6.0m $69.1m | Reduced -164.9k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 5.7m $65.2m | Reduced -1.3m |
| NORTHERN TRUST CORP 0.01% of their portfolio | 5.3m $60.8m | Reduced -251.6k |
| SEI INVESTMENTS CO 0.06% of their portfolio | 5.2m $60.1m | Added +677.7k |
| VOYA INVESTMENT MANAGEMENT LLC 0.06% of their portfolio | 5.0m $56.9m | Reduced -6.1k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 4.9m $55.9m | Added +151.1k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 4.4m $50.6m | Added +93.2k |
| AQR CAPITAL MANAGEMENT LLC 0.03% of their portfolio | 4.4m $50.3m | Added +3.2m |
| Voss Capital, LP 2.50% of their portfolio | 4.1m $47.0m | Reduced -422.2k |
| First Pacific Advisors, LP 0.60% of their portfolio | 4.0m $45.5m | Reduced -102.4k |
| JANE STREET GROUP, LLC 0.05% of their portfolio | 3.8m $43.9m | Added +3.8m |
| MILLENNIUM MANAGEMENT LLC 0.03% of their portfolio | 3.7m $42.0m | Added +966.5k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 3.6m $41.6m | Added +2.1m |
| Assenagon Asset Management S.A. 0.06% of their portfolio | 3.6m $41.5m | New |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 1.81% of their portfolio | 3.5m $40.7m | Reduced -1.6m |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.06% of their portfolio | 3.2m $37.2m | New |
| Brickwood Asset Management LLP 25.39% of their portfolio | 3.2m $36.5m | Added +3.1m |
| Eversept Partners, LP 2.04% of their portfolio | 3.2m $36.4m | Added +2.3m |
| Freestone Grove Partners LP 0.21% of their portfolio | 2.6m $29.6m | New |
| PRIVATE MANAGEMENT GROUP INC 0.82% of their portfolio | 2.5m $28.2m | Added +823.6k |
| TD Asset Management Inc 0.02% of their portfolio | 2.3m $26.3m | Reduced -171.0k |
| NATIXIS ADVISORS, LLC 0.03% of their portfolio | 2.1m $24.3m | Added +214.7k |
| FIRST TRUST ADVISORS LP 0.02% of their portfolio | 2.1m $24.2m | Reduced -579.9k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 2.1m $24.0m | Reduced -288.4k |
| CITIGROUP INC 0.02% of their portfolio | 2.0m $22.9m | Reduced -1.1m |
| Perpetual Ltd 0.30% of their portfolio | 1.8m $21.0m | Added +28.3k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.22% of their portfolio | 1.8m $20.8m | Reduced -732.1k |
| NEW SOUTH CAPITAL MANAGEMENT INC 0.96% of their portfolio | 1.8m $20.8m | Reduced -18.2k |
| Zuckerman Investment Group, LLC 1.79% of their portfolio | 1.7m $20.1m | Added +26.0k |
| RHUMBLINE ADVISERS 0.02% of their portfolio | 1.7m $19.0m | Reduced -77.9k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.12% of their portfolio | 1.6m $18.0m | Reduced -1.5m |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 1.5m $16.8m | Reduced -47.2k |
| Nuveen, LLC 0.00% of their portfolio | 1.4m $16.5m | Added +518.4k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 1.4m $15.5m | Reduced -390.5k |
| Swiss National Bank 0.01% of their portfolio | 1.3m $15.4m | Added +23.5k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 1.3m $14.9m | Reduced -520.8k |
| Corient Private Wealth LP 0.01% of their portfolio | 1.3m $14.3m | Reduced -2.3m |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 1.2m $14.3m | Reduced -6.7m |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 1.2m $13.7m | Reduced -2.4m |
| Alberta Investment Management Corp 0.08% of their portfolio | 1.1m $12.7m | New |
| Loews Corp 0.09% of their portfolio | 1.0m $11.5m | Reduced -400.0k |
| Legal & General Group Plc 0.00% of their portfolio | 999.3k $11.5m | Reduced -138.2k |
| Walleye Capital LLC 0.06% of their portfolio | 991.4k $11.4m | Reduced -37.8k |
| BARCLAYS PLC 0.00% of their portfolio | 967.6k $11.1m | Reduced -149.6k |
| WESTWOOD HOLDINGS GROUP INC 0.09% of their portfolio | 949.0k $10.9m | New |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 933.9k $10.7m | Reduced -911.4k |
| California Public Employees Retirement System 0.01% of their portfolio | 925.3k $10.6m | Reduced -9.2k |
| Stanley Capital Management, LLC 1.76% of their portfolio | 918.5k $10.5m | Reduced -400.0k |
| Prosight Management, LP 2.13% of their portfolio | 898.5k $10.3m | New |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 857.5k $9.8m | Reduced -1.0k |
| Retirement Systems of Alabama 0.03% of their portfolio | 818.3k $9.4m | Reduced -6.0k |
| Olstein Capital Management, L.P. 1.92% of their portfolio | 818.0k $9.4m | Added +24.0k |
| READYSTATE ASSET MANAGEMENT LP 0.41% of their portfolio | 813.1k $9.3m | Added +738.9k |
| Weiss Asset Management LP 0.12% of their portfolio | 755.4k $8.7m | Added +204.8k |
| SECTOR GAMMA AS 1.82% of their portfolio | 695.4k $8.0m | Added +218.3k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 658.0k $7.5m | Reduced -231.4k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 640.8k $7.3m | Reduced -584 |
| DekaBank Deutsche Girozentrale 0.03% of their portfolio | 628.1k $16.6m | Unchanged |
| Verition Fund Management LLC 0.04% of their portfolio | 581.3k $6.7m | Added +218.9k |
| THORNBURG INVESTMENT MANAGEMENT INC 0.08% of their portfolio | 577.0k $6.6m | Added +131.2k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 568.1k $6.5m | Reduced -37.0k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 563.5k $6.5m | Added +26.0k |
| GENDELL JEFFREY L 0.11% of their portfolio | 545.0k $6.2m | New |
| Capitolis Liquid Global Markets LLC 0.03% of their portfolio | 505.0k $5.8m | New |
| Clearline Capital LP 0.43% of their portfolio | 502.7k $5.8m | New |
| MOORE CAPITAL MANAGEMENT, LP 0.12% of their portfolio | 499.1k $5.7m | Added +205.5k |
| Taikang Asset Management (Hong Kong) Co Ltd 0.55% of their portfolio | 486.6k $5.6m | Added +171.7k |
| REINHART PARTNERS, LLC. 0.17% of their portfolio | 485.0k $5.6m | Reduced -202.8k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 461.9k $5.3m | Added +3.8k |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 436.6k $5.0m | Added +406.9k |
| Boston Partners 0.01% of their portfolio | 433.4k $5.0m | New |
| Aquatic Capital Management LLC 0.14% of their portfolio | 425.8k $4.9m | New |
| Pacific Capital Partners Ltd 5.17% of their portfolio | 424.5k $4.9m | Reduced -80.6k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 412.7k $4.7m | Added +129.8k |
| MACKENZIE FINANCIAL CORP 0.01% of their portfolio | 412.5k $4.7m | Added +380.2k |
| Quantinno Capital Management LP 0.01% of their portfolio | 406.9k $4.7m | Reduced -126.7k |
| SG Americas Securities, LLC 0.01% of their portfolio | 402.0k $4.6m | Added +272.1k |