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 ($35.1m this quarter). Holder counts are more reliable. Shares outstanding: 676.4m as of 2026-07-24, 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 ≈ $9.91. Options: 9 managers hold calls ($9.1m notional), 8 hold puts ($5.0m).
Trends to Q2 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 |
| Q2 2026 | 459 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| 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 |
| Q2 2026 | 282 | 175 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $16.8m | $17.4m | 1.03 |
| Q4 2025 | $15.1m | $52.2m | 3.46 |
| Q1 2026 | $4.8m | $72.8m | 15.28 |
| Q2 2026 | $9.1m | $5.0m | 0.54 |
Biggest buyers
| MARSHALL WACE, LLP | Added | +9.7m |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | New | +7.4m |
| AQR CAPITAL MANAGEMENT LLC | Added | +6.8m |
| Invesco Ltd. | Added | +5.8m |
| EARNEST PARTNERS LLC | Added | +4.7m |
| BlackRock, Inc. | Added | +4.6m |
| BANK OF AMERICA CORP /DE/ | Added | +3.9m |
| DIMENSIONAL FUND ADVISORS LP | Added | +3.5m |
| Freestone Grove Partners LP | Added | +2.9m |
| GENDELL JEFFREY L | Added | +2.7m |
Biggest sellers
| WELLINGTON MANAGEMENT GROUP LLP | Sold out | -24.2m |
| T. Rowe Price Investment Management, Inc. | Sold out | -14.8m |
| JANE STREET GROUP, LLC | Sold out | -5.0m |
| D. E. Shaw & Co., Inc. | Reduced | -3.5m |
| Eversept Partners, LP | Sold out | -3.0m |
| Robeco Schweiz AG | Reduced | -2.7m |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | Reduced | -2.6m |
| TUDOR INVESTMENT CORP ET AL | Sold out | -2.3m |
| VOYA INVESTMENT MANAGEMENT LLC | Reduced | -2.3m |
| Clarkston Capital Partners, LLC | Reduced | -1.8m |
Biggest calls
| SIMPLEX TRADING, LLC | Added | $2.8m278.8k shares |
| CastleKnight Management LP | New | $2.0m200.0k shares |
| GROUP ONE TRADING LLC | Added | $1.2m123.7k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.2m120.7k shares |
| IMC-Chicago, LLC | Added | $745.5k75.3k shares |
| CITADEL ADVISORS LLC | Added | $443.5k44.8k shares |
| JANE STREET GROUP, LLC | Reduced | $301.0k30.4k shares |
| Loews Corp | Unchanged | $297.0k30.0k shares |
| Walleye Capital LLC | Reduced | $139.6k14.1k shares |
Biggest puts
| JANE STREET GROUP, LLC | Reduced | $2.2m224.9k shares |
| CITADEL ADVISORS LLC | Added | $683.1k69.0k shares |
| IMC-Chicago, LLC | Added | $638.5k64.5k shares |
| SIMPLEX TRADING, LLC | Added | $400.0k40.4k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $394.0k39.8k shares |
| Walleye Capital LLC | Added | $255.4k25.8k shares |
| GROUP ONE TRADING LLC | Added | $254.4k25.7k shares |
| Walleye Trading LLC | Added | $99.0k10.0k 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 since 1 Apr 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 |
|---|---|---|---|---|---|
| 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 | — | — |
| Q2 2026 | 2 | $286.7k | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-05-08 | LUCIER GREGORY T Director | Bought | $83.2k10.0k shares |
| 2026-05-01 | Dingemans Simon Director · By Spouse | Bought | $203.5k25.0k 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, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| Dodge & Cox 0.62% of their portfolio | 120.0m $1.2bn | Added +372.6k |
| BlackRock, Inc. 0.01% of their portfolio | 70.3m $695.8m | Added +4.6m |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.01% of their portfolio | 31.3m $310.3m | Added +67.4k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 30.8m $304.9m | Added +196.7k |
| GREENHAVEN ASSOCIATES INC 2.82% of their portfolio | 24.6m $243.9m | Added +2.0m |
| STATE STREET CORP 0.01% of their portfolio | 21.6m $213.6m | Added +851.9k |
| DIMENSIONAL FUND ADVISORS LP 0.04% of their portfolio | 20.4m $202.1m | Added +3.5m |
| Engine Capital Management, LP 19.13% of their portfolio | 19.9m $196.6m | Added +80.0k |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC 0.59% of their portfolio | 19.7m $195.4m | Reduced -2.6m |
| New Mountain Capital, L.L.C. 100.00% of their portfolio | 14.0m $138.6m | Unchanged |
| Invesco Ltd. 0.01% of their portfolio | 13.9m $137.5m | Added +5.8m |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 13.2m $130.5m | Added +289.1k |
| MARSHALL WACE, LLP 0.11% of their portfolio | 13.1m $130.0m | Added +9.7m |
| AQR CAPITAL MANAGEMENT LLC 0.04% of their portfolio | 11.6m $115.1m | Added +6.8m |
| BANK OF AMERICA CORP /DE/ 0.01% of their portfolio | 11.0m $108.8m | Added +3.9m |
| EARNEST PARTNERS LLC 0.38% of their portfolio | 10.7m $106.4m | Added +4.7m |
| LONDON CO OF VIRGINIA 0.59% of their portfolio | 10.5m $103.8m | Reduced -366.3k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.28% of their portfolio | 10.3m $101.5m | Reduced -375.8k |
| D. E. Shaw & Co., Inc. 0.06% of their portfolio | 9.6m $94.8m | Reduced -3.5m |
| First Pacific Advisors, LP 1.00% of their portfolio | 8.2m $81.1m | Added +101.7k |
| SEI INVESTMENTS CO 0.07% of their portfolio | 7.9m $78.7m | Added +2.7m |
| FMR LLC 0.00% of their portfolio | 7.8m $77.7m | Added +235.1k |
| GENDELL JEFFREY L 0.68% of their portfolio | 7.6m $75.3m | Added +2.7m |
| VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. 0.65% of their portfolio | 7.4m $73.2m | New |
| Clarkston Capital Partners, LLC 5.68% of their portfolio | 6.8m $67.2m | Reduced -1.8m |
| MORGAN STANLEY 0.00% of their portfolio | 6.8m $66.9m | Added +659.9k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 6.2m $61.4m | Added +2.5m |
| NORGES BANK 0.01% of their portfolio | 6.1m $60.3m | Not comparable |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 5.8m $57.6m | Added +410.3k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 5.7m $56.8m | Added +274.0k |
| Freestone Grove Partners LP 0.37% of their portfolio | 5.7m $56.6m | Added +2.9m |
| UBS Group AG 0.01% of their portfolio | 5.7m $56.2m | Added +2.0m |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 5.5m $54.7m | Added +1.4m |
| NATIXIS ADVISORS, LLC 0.06% of their portfolio | 4.9m $49.0m | Added +2.4m |
| YACKTMAN ASSET MANAGEMENT LP 0.58% of their portfolio | 4.8m $47.2m | Added +25.0k |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 2.44% of their portfolio | 4.7m $46.8m | Added +1.2m |
| Brickwood Asset Management LLP 32.70% of their portfolio | 4.6m $45.5m | Added +260.5k |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 4.3m $42.8m | Added +94.5k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 4.1m $40.8m | Reduced -297.8k |
| JONES FINANCIAL COMPANIES LLLP 0.02% of their portfolio | 4.1m $42.4m | Added +1.8m |
| ROYCE & ASSOCIATES LP 0.29% of their portfolio | 3.7m $36.4m | Added +2.2m |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.32% of their portfolio | 3.5m $34.7m | Added +1.5m |
| PRIVATE MANAGEMENT GROUP INC 0.81% of their portfolio | 3.1m $30.7m | Added +364.2k |
| Voss Capital, LP 1.31% of their portfolio | 2.6m $26.2m | Reduced -1.8m |
| Prescott General Partners LLC 1.32% of their portfolio | 2.6m $25.7m | Unchanged |
| Gotham Asset Management, LLC 0.06% of their portfolio | 2.5m $24.9m | Added +1.2m |
| Quantinno Capital Management LP 0.03% of their portfolio | 2.4m $24.2m | Added +1.3m |
| Loews Corp 0.17% of their portfolio | 2.2m $21.8m | Added +200.0k |
| Western Standard LLC 7.07% of their portfolio | 2.1m $20.9m | New |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 2.0m $20.1m | Reduced -119.0k |
| KETTLE HILL CAPITAL MANAGEMENT, LLC 4.53% of their portfolio | 1.9m $18.4m | Added +732.4k |
| Corient Private Wealth LP 0.02% of their portfolio | 1.8m $17.4m | Added +1.1m |
| SHAPIRO CAPITAL MANAGEMENT LLC 1.00% of their portfolio | 1.7m $16.6m | Added +1.1m |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 1.7m $16.5m | Added +9.7k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 1.5m $15.3m | Added +27.3k |
| VOYA INVESTMENT MANAGEMENT LLC 0.01% of their portfolio | 1.5m $14.6m | Reduced -2.3m |
| LOOMIS SAYLES & CO L P 0.02% of their portfolio | 1.5m $14.6m | Added +232.1k |
| NEW SOUTH CAPITAL MANAGEMENT INC 0.64% of their portfolio | 1.5m $14.6m | Reduced -90.7k |
| Robeco Schweiz AG 0.23% of their portfolio | 1.5m $14.5m | Reduced -2.7m |
| MACKENZIE FINANCIAL CORP 0.01% of their portfolio | 1.4m $13.7m | Added +1.2m |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 1.4m $14.0m | Reduced -16.8k |
| Swiss National Bank 0.01% of their portfolio | 1.3m $13.1m | Reduced -26.6k |
| Nuveen, LLC 0.00% of their portfolio | 1.2m $12.1m | Reduced -211.3k |
| Clearline Capital LP 0.72% of their portfolio | 1.1m $11.1m | Unchanged |
| Assenagon Asset Management S.A. 0.01% of their portfolio | 1.1m $11.0m | Added +1.0m |
| Cerity Partners LLC 0.01% of their portfolio | 1.1m $10.5m | Added +232.8k |
| Diamond Hill Capital Management, LLC (Investment Advisor) 0.08% of their portfolio | 1.0m $10.4m | Reduced -720.6k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 1.0m $10.1m | Added +613.9k |
| Squarepoint Ops LLC 0.02% of their portfolio | 1.0m $10.0m | Added +812.2k |
| Man Group plc 0.02% of their portfolio | 990.5k $9.8m | Added +379.4k |
| California Public Employees Retirement System 0.01% of their portfolio | 954.4k $9.4m | Reduced -201.1k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.01% of their portfolio | 954.0k $9.4m | Reduced -147.5k |
| SECTOR GAMMA AS 1.95% of their portfolio | 906.1k $9.0m | Added +210.7k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 893.1k $8.8m | Added +78.1k |
| Legal & General Group Plc 0.00% of their portfolio | 888.5k $8.8m | Reduced -18.1k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 853.0k $8.4m | Reduced -97.5k |
| BARCLAYS PLC 0.00% of their portfolio | 852.5k $8.4m | Reduced -144.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 841.6k $6.6m | Reduced -6.0k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.00% of their portfolio | 813.5k $8.1m | New |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.01% of their portfolio | 764.7k $7.6m | Added +462.5k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 763.4k $7.6m | Reduced -22.4k |
| KING LUTHER CAPITAL MANAGEMENT CORP 0.03% of their portfolio | 757.4k $7.5m | Added +252.7k |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 753.6k $7.5m | Reduced -1.7m |
| CastleKnight Management LP 0.27% of their portfolio | 751.7k $7.4m | New |
| Retirement Systems of Alabama 0.02% of their portfolio | 706.2k $7.0m | Reduced -130.0k |
| EASTERLY INVESTMENT PARTNERS LLC 0.35% of their portfolio | 690.8k $6.8m | New |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 689.9k $6.8m | Added +54.9k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 673.3k $6.7m | Added +561.8k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 640.5k $6.3m | Added +239.7k |
| Melqart Asset Management (UK) Ltd 0.60% of their portfolio | 635.8k $6.3m | New |
| DekaBank Deutsche Girozentrale 0.01% of their portfolio | 628.1k $4.8m | Unchanged |
| VANGUARD ASSET MANAGEMENT, Ltd 0.00% of their portfolio | 611.9k $6.1m | Added +10.3k |
| Taikang Asset Management (Hong Kong) Co Ltd 0.53% of their portfolio | 585.0k $5.8m | Reduced -433.9k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.01% of their portfolio | 584.9k $5.8m | Added +120.3k |
| ALGERT GLOBAL LLC 0.07% of their portfolio | 576.4k $5.7m | Reduced -54.0k |
| FIFTH THIRD BANCORP 0.01% of their portfolio | 564.1k $5.6m | Added +139.3k |
| CITIGROUP INC 0.00% of their portfolio | 551.9k $5.5m | Added +138.4k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 547.4k $5.4m | Reduced -16.5k |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 541.7k $5.4m | Reduced -26.4k |
| Amundi 0.00% of their portfolio | 515.5k $5.1m | Reduced -16.1k |