Avantor, Inc.
US ˙ NYSE ˙ US05352A1007

SecurityAVTR / Avantor, Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership2,541,675 shares
Latest Disclosed Value $ 19,927
Natixis Advisors, L.p. reports 19.79% increase in ownership of AVTR / Avantor, Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 2,541,675 shares of Avantor, Inc. (US:AVTR) valued at $19,926,732 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 2,121,823 shares of Avantor, Inc.. This represents a change in shares of 19.79% during the quarter. The current value of the position is $23,052,992 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F AVANTOR COM 05352A100 2,541,675 419,852 19.79 20 -20.83 0.0277
2026-02-10 2025-12-31 13F AVANTOR COM 05352A100 2,121,823 214,746 11.26 24 4.35 0.0345
2025-11-13 2025-09-30 13F AVANTOR COM 05352A100 1,907,077 1,058,617 124.77 24 109.09 0.0347
2025-08-13 2025-06-30 13F AVANTOR COM 05352A100 848,460 612,996 260.34 11 266.67 0.0181
2025-05-08 2025-03-31 13F AVANTOR COM 05352A100 235,464 -167,646 -41.59 4 -62.50 0.0071
2025-02-10 2024-12-31 13F AVANTOR COM 05352A100 403,110 -94,413 -18.98 8 -33.33 0.0159
2024-11-06 2024-09-30 13F AVANTOR COM 05352A100 497,523 43,099 9.48 13 33.33 0.0251
2024-08-01 2024-06-30 13F AVANTOR COM 05352A100 454,424 -790,540 -63.50 10 -70.97 0.0209
2024-04-25 2024-03-31 13F AVANTOR COM 05352A100 1,244,964 -499,215 -28.62 32 -20.51 0.0732
2024-02-06 2023-12-31 13F AVANTOR COM 05352A100 1,744,179 400,592 29.82 40 39.29 0.1048
2023-11-13 2023-09-30 13F AVANTOR COM 05352A100 1,343,587 267,930 24.91 28 27.27 0.0866
2023-08-15 2023-06-30 13F AVANTOR COM 05352A100 1,075,657 -32,030 -2.89 22 -4.35 0.0682
2023-05-11 2023-03-31 13F AVANTOR COM 05352A100 1,107,687 63,232 6.05 23 4.55 0.0806
2023-01-27 2022-12-31 13F AVANTOR COM 05352A100 1,044,455 389,534 59.48 22 -99.83 0.0833
2022-11-14 2022-09-30 13F AVANTOR COM 05352A100 654,921 -33,692 -4.89 12,837 -40.06 0.0543
2022-08-12 2022-06-30 13F AVANTOR COM 05352A100 688,613 50,036 7.84 21,416 -0.84 0.0942
2022-05-12 2022-03-31 13F AVANTOR COM 05352A100 638,577 174,517 37.61 21,597 10.44 0.0824
2022-02-08 2021-12-31 13F AVANTOR COM 05352A100 464,060 17,408 3.90 19,555 7.04 0.0747
2021-11-15 2021-09-30 13F AVANTOR COM 05352A100 446,652 -89,803 -16.74 18,269 -4.10 0.0751
2021-08-12 2021-06-30 13F AVANTOR COM 05352A100 536,455 177,972 49.65 19,050 83.72 0.0889
2021-05-05 2021-03-31 13F AVANTOR COM 05352A100 358,483 -70,594 -16.45 10,369 -14.16 0.0541
2021-02-12 2020-12-31 13F AVANTOR COM 05352A100 429,077 78,174 22.28 12,079 53.05 0.0696
2020-11-12 2020-09-30 13F AVANTOR COM 05352A100 350,903 111,284 46.44 7,892 93.76 0.0497
2020-08-11 2020-06-30 13F AVANTOR COM 05352A100 239,619 123,939 107.14 4,073 181.87 0.0270
2020-04-27 2020-03-31 13F AVANTOR COM 05352A100 115,680 -31,358 -21.33 1,445 -45.86 0.0118
2020-02-10 2019-12-31 13F AVANTOR COM 05352A100 147,038 147,038 2,669 0.0188
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.