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 ($10.7m this quarter). Holder counts are more reliable. Shares outstanding: 682.8m as of 2026-04-24, 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 ≈ $7.85. Options: 10 managers hold calls ($4.8m notional), 10 hold puts ($72.8m).
Trends to Q1 2026
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 |
| Q1 2026 | 433 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| 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 |
| Q1 2026 | 249 | 197 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q2 2025 | $43.7m | $28.2m | 0.64 |
| Q3 2025 | $16.8m | $17.4m | 1.03 |
| Q4 2025 | $15.1m | $52.2m | 3.46 |
| Q1 2026 | $4.8m | $72.8m | 15.28 |
Biggest buyers
| Engine Capital Management, LP | Added | +7.9m |
| FULLER & THALER ASSET MANAGEMENT, INC. | Added | +7.4m |
| D. E. Shaw & Co., Inc. | Added | +6.9m |
| BlackRock, Inc. | Added | +6.1m |
| YACKTMAN ASSET MANAGEMENT LP | New | +4.7m |
| GENDELL JEFFREY L | Added | +4.4m |
| First Pacific Advisors, LP | Added | +4.1m |
| MARSHALL WACE, LLP | New | +3.4m |
| GOLDMAN SACHS GROUP INC | Added | +2.8m |
| Prescott General Partners LLC | New | +2.6m |
Biggest sellers
| T. Rowe Price Investment Management, Inc. | Reduced | -38.6m |
| MORGAN STANLEY | Reduced | -11.4m |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | Reduced | -10.9m |
| Invesco Ltd. | Reduced | -9.1m |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Reduced | -7.6m |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | -7.1m |
| Clarkston Capital Partners, LLC | Reduced | -6.5m |
| UBS Group AG | Reduced | -4.1m |
| Assenagon Asset Management S.A. | Reduced | -3.5m |
| Robeco Schweiz AG | Reduced | -3.1m |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.8m229.8k shares |
| MILLENNIUM MANAGEMENT LLC | New | $784.0k100.0k shares |
| IMC-Chicago, LLC | Reduced | $410.0k52.3k shares |
| SIMPLEX TRADING, LLC | Reduced | $366.9k46.8k shares |
| JANE STREET GROUP, LLC | Added | $326.9k41.7k shares |
| Walleye Capital LLC | Reduced | $303.4k38.7k shares |
| CITADEL ADVISORS LLC | Reduced | $236.0k30.1k shares |
| Loews Corp | Unchanged | $235.2k30.0k shares |
| GROUP ONE TRADING LLC | Reduced | $207.0k26.4k shares |
| Walleye Trading LLC | Reduced | $90.2k11.5k shares |
Biggest puts
| JANE STREET GROUP, LLC | Added | $69.2m8.8m shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.9m243.2k shares |
| CITADEL ADVISORS LLC | Reduced | $497.8k63.5k shares |
| IMC-Chicago, LLC | Reduced | $410.8k52.4k shares |
| GOLDMAN SACHS GROUP INC | Reduced | $313.6k40.0k shares |
| Walleye Capital LLC | Reduced | $174.8k22.3k shares |
| GROUP ONE TRADING LLC | Added | $139.6k17.8k shares |
| SIG BROKERAGE, LP | New | $78.4k10.0k shares |
| SIMPLEX TRADING, LLC | Reduced | $71.3k9.1k shares |
| Walleye Trading LLC | Reduced | $2.4k300 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 Q1 2026
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 |
|---|---|---|---|---|---|
| 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 | — | — |
| Q1 2026 | 3 | $2.4m | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-03-10 | MEHRA SANJEEV K Director · By limited liability company | Bought | $1.0m125.0k shares |
| 2026-02-19 | LUCIER GREGORY T Director · By a Trust | Bought | $458.0k50.0k shares |
| 2026-02-12 | SUMME GREGORY L Director · By a Trust | Bought | $940.0k100.0k 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, Q1 2026
| Manager | Shares | Change |
|---|---|---|
| Dodge & Cox 0.52% of their portfolio | 119.6m $938.0m | Added +2.6m |
| BlackRock, Inc. 0.01% of their portfolio | 65.7m $515.1m | Added +6.1m |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.01% of their portfolio | 31.3m $245.2m | First filing |
| VANGUARD CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 30.6m $240.0m | First filing |
| WELLINGTON MANAGEMENT GROUP LLP 0.04% of their portfolio | 24.2m $189.9m | Added +787.5k |
| GREENHAVEN ASSOCIATES INC 2.92% of their portfolio | 22.6m $177.1m | Added +2.1m |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC 0.57% of their portfolio | 22.4m $175.3m | Reduced -10.9m |
| STATE STREET CORP 0.01% of their portfolio | 20.7m $162.5m | Added +511.7k |
| Engine Capital Management, LP 18.72% of their portfolio | 19.8m $155.1m | Added +7.9m |
| DIMENSIONAL FUND ADVISORS LP 0.03% of their portfolio | 16.9m $132.4m | Added +2.3m |
| T. Rowe Price Investment Management, Inc. 0.08% of their portfolio | 14.8m $115.9m | Reduced -38.6m |
| New Mountain Capital, L.L.C. 100.00% of their portfolio | 14.0m $109.8m | Unchanged |
| D. E. Shaw & Co., Inc. 0.08% of their portfolio | 13.1m $102.8m | Added +6.9m |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 12.9m $101.1m | Added +912.9k |
| LONDON CO OF VIRGINIA 0.52% of their portfolio | 10.9m $85.1m | Reduced -1.1m |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.28% of their portfolio | 10.6m $83.4m | Added +7.4m |
| Clarkston Capital Partners, LLC 5.16% of their portfolio | 8.6m $67.7m | Reduced -6.5m |
| First Pacific Advisors, LP 0.89% of their portfolio | 8.1m $63.4m | Added +4.1m |
| Invesco Ltd. 0.01% of their portfolio | 8.1m $63.3m | Reduced -9.1m |
| FMR LLC 0.00% of their portfolio | 7.6m $59.7m | Reduced -60.4k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 7.1m $55.4m | Added +1.4m |
| MORGAN STANLEY 0.00% of their portfolio | 6.1m $47.8m | Reduced -11.4m |
| EARNEST PARTNERS LLC 0.19% of their portfolio | 6.0m $47.2m | Reduced -7.1k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 5.5m $42.8m | Added +149.2k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 5.4m $42.4m | Added +531.3k |
| SEI INVESTMENTS CO 0.04% of their portfolio | 5.3m $41.5m | Added +46.7k |
| JANE STREET GROUP, LLC 0.04% of their portfolio | 5.0m $38.9m | Added +1.1m |
| GENDELL JEFFREY L 0.53% of their portfolio | 4.9m $38.6m | Added +4.4m |
| AQR CAPITAL MANAGEMENT LLC 0.02% of their portfolio | 4.9m $37.7m | Added +475.6k |
| YACKTMAN ASSET MANAGEMENT LP 0.50% of their portfolio | 4.7m $37.2m | New |
| Voss Capital, LP 1.99% of their portfolio | 4.4m $34.9m | Added +344.3k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 4.4m $34.6m | Added +1.1k |
| Brickwood Asset Management LLP 25.52% of their portfolio | 4.3m $34.0m | Added +1.2m |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 4.2m $33.1m | First filing |
| Robeco Schweiz AG 0.69% of their portfolio | 4.2m $32.8m | Reduced -3.1m |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 4.1m $32.3m | Added +490.0k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 3.7m $29.3m | Reduced -1.2m |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 3.7m $29.1m | Added +2.8m |
| UBS Group AG 0.01% of their portfolio | 3.7m $28.7m | Reduced -4.1m |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 1.36% of their portfolio | 3.5m $27.6m | Reduced -28.3k |
| MARSHALL WACE, LLP 0.03% of their portfolio | 3.4m $27.0m | New |
| Eversept Partners, LP 1.54% of their portfolio | 3.0m $23.3m | Reduced -202.4k |
| Freestone Grove Partners LP 0.16% of their portfolio | 2.8m $21.9m | Added +207.2k |
| PRIVATE MANAGEMENT GROUP INC 0.62% of their portfolio | 2.7m $21.4m | Added +276.1k |
| Prescott General Partners LLC 1.49% of their portfolio | 2.6m $20.4m | New |
| NATIXIS ADVISORS, LLC 0.03% of their portfolio | 2.5m $19.9m | Added +419.9k |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 2.4m $19.1m | Reduced -1.2m |
| TUDOR INVESTMENT CORP ET AL 0.10% of their portfolio | 2.3m $18.4m | Added +2.0m |
| JONES FINANCIAL COMPANIES LLLP 0.01% of their portfolio | 2.3m $17.3m | Added +2.3m |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 2.1m $16.8m | Added +54.1k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.16% of their portfolio | 2.0m $15.9m | Added +212.0k |
| Loews Corp 0.13% of their portfolio | 2.0m $15.7m | Added +1.0m |
| Diamond Hill Capital Management, LLC (Investment Advisor) 0.09% of their portfolio | 1.8m $13.9m | New |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 1.7m $13.0m | Added +1.7k |
| NEW SOUTH CAPITAL MANAGEMENT INC 0.59% of their portfolio | 1.6m $12.3m | Reduced -248.6k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 1.5m $11.9m | Added +56.4k |
| ROYCE & ASSOCIATES LP 0.11% of their portfolio | 1.5m $11.5m | Added +1.4m |
| Nuveen, LLC 0.00% of their portfolio | 1.4m $11.2m | Reduced -12.4k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 1.4m $10.5m | Added +190.7k |
| Swiss National Bank 0.01% of their portfolio | 1.3m $10.6m | Added +5.3k |
| Gotham Asset Management, LLC 0.03% of their portfolio | 1.3m $10.4m | Added +965.8k |
| LOOMIS SAYLES & CO L P 0.01% of their portfolio | 1.2m $9.7m | New |
| Olstein Capital Management, L.P. 2.07% of their portfolio | 1.2m $9.5m | Added +392.0k |
| Quantinno Capital Management LP 0.02% of their portfolio | 1.2m $9.2m | Added +762.3k |
| California Public Employees Retirement System 0.01% of their portfolio | 1.2m $9.1m | Added +230.2k |
| KETTLE HILL CAPITAL MANAGEMENT, LLC 2.22% of their portfolio | 1.1m $8.8m | New |
| Clearline Capital LP 0.69% of their portfolio | 1.1m $8.8m | Added +621.1k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.01% of their portfolio | 1.1m $8.6m | Reduced -7.6m |
| Taikang Asset Management (Hong Kong) Co Ltd 0.79% of their portfolio | 1.0m $8.0m | Added +532.3k |
| BARCLAYS PLC 0.00% of their portfolio | 996.6k $7.8m | Added +29.0k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 950.4k $7.5m | Reduced -346.8k |
| TD Asset Management Inc 0.01% of their portfolio | 930.6k $7.3m | Reduced -1.4m |
| Stanley Capital Management, LLC 1.20% of their portfolio | 918.5k $7.2m | Unchanged |
| Legal & General Group Plc 0.00% of their portfolio | 906.6k $7.1m | Reduced -92.6k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 847.6k $9.7m | Reduced -9.9k |
| Retirement Systems of Alabama 0.02% of their portfolio | 836.2k $6.6m | Added +17.9k |
| Cerity Partners LLC 0.01% of their portfolio | 825.9k $6.5m | Added +815.9k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 815.0k $6.4m | Reduced -541.2k |
| READYSTATE ASSET MANAGEMENT LP 0.36% of their portfolio | 788.2k $6.2m | Reduced -24.8k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 785.8k $6.2m | Added +145.0k |
| Woodline Partners LP 0.02% of their portfolio | 755.7k $5.9m | New |
| SECTOR GAMMA AS 1.29% of their portfolio | 695.4k $5.5m | Unchanged |
| Corient Private Wealth LP 0.01% of their portfolio | 637.5k $5.0m | Reduced -614.7k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 635.0k $5.0m | Added +71.5k |
| ALGERT GLOBAL LLC 0.07% of their portfolio | 630.4k $4.9m | Added +555.0k |
| DekaBank Deutsche Girozentrale 0.01% of their portfolio | 628.1k $4.9m | Unchanged |
| Man Group plc 0.01% of their portfolio | 611.1k $4.8m | New |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 608.3k $4.8m | New |
| VANGUARD ASSET MANAGEMENT, Ltd 0.00% of their portfolio | 601.6k $4.7m | First filing |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 569.5k $4.5m | Reduced -674.4k |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 568.1k $4.5m | First filing |
| TWINBEECH CAPITAL LP 0.46% of their portfolio | 567.4k $4.4m | New |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 563.9k $4.4m | Reduced -4.3k |
| Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio | 548.8k $4.3m | Added +413.9k |
| SHAPIRO CAPITAL MANAGEMENT LLC 0.26% of their portfolio | 536.3k $4.2m | New |
| Amundi 0.00% of their portfolio | 531.6k $4.2m | Added +415.3k |
| Weiss Asset Management LP 0.08% of their portfolio | 527.9k $4.1m | Reduced -227.5k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 520.8k $4.1m | Added +58.9k |
| KING LUTHER CAPITAL MANAGEMENT CORP 0.02% of their portfolio | 504.7k $4.0m | Added +472.7k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.01% of their portfolio | 464.7k $3.6m | Added +225.4k |