Avantor, Inc.
US ˙ NYSE ˙ US05352A1007

SecurityAVTR / Avantor, Inc.
InstitutionParallel Advisors, LLC
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Parallel Advisors, LLC ownership in AVTR / Avantor, Inc.

On June 2, 2026 - Parallel Advisors, LLC filed a 13F-HR/A form disclosing ownership of 0 shares of Avantor, Inc. (US:AVTR) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 6,961 shares of Avantor, Inc.. This represents a change in shares of -100.00% during the quarter. The current value of the position is $0 USD.

Parallel Advisors, LLC has a history of taking positions in derivatives of the underlying security (AVTR) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

AVTR / Avantor, Inc. Historical Put/Call Ratio
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)
2026-06-02 2026-03-31 13F/A-1 AVANTOR INC COM Stock 05352A100 0 -6,961 -100.00 0 -100.00
2026-02-11 2025-12-31 13F AVANTOR INC COM Stock 05352A100 6,961 -6,461 -48.14 80 -52.69 0.0015
2025-11-13 2025-09-30 13F AVANTOR INC COM Stock 05352A100 13,422 329 2.51 168 -5.11 0.0031
2025-07-08 2025-06-30 13F AVANTOR INC COM Stock 05352A100 13,093 1,691 14.83 176 -4.35 0.0035
2025-04-08 2025-03-31 13F AVANTOR INC COM Stock 05352A100 11,402 -295 -2.52 185 -25.20 0.0042
2025-02-10 2024-12-31 13F AVANTOR INC COM Stock 05352A100 11,697 262 2.29 246 -16.61 0.0055
2024-11-13 2024-09-30 13F AVANTOR INC COM Stock 05352A100 11,435 1,034 9.94 296 34.09 0.0070
2024-08-08 2024-06-30 13F AVANTOR INC COM Stock 05352A100 10,401 -161 -1.52 221 -18.52 0.0056
2024-05-06 2024-03-31 13F AVANTOR INC COM Stock 05352A100 10,562 21 0.20 270 12.50 0.0073
2024-02-12 2023-12-31 13F AVANTOR INC COM Stock 05352A100 10,541 1,382 15.09 241 24.35 0.0071
2024-05-20 2023-09-30 13F/A-1 AVANTOR INC COM Stock 05352A100 9,159 -205 -2.19 193 0.52 0.0064
2023-11-14 2023-09-30 13F AVANTOR INC COM Stock 05352A100 9,159 -205 193 0.0064
2024-05-20 2023-06-30 13F/A-1 AVANTOR INC COM Stock 05352A100 9,364 -212 -2.21 192 -4.95 0.0062
2023-08-04 2023-06-30 13F AVANTOR INC COM Stock 05352A100 9,364 -212 192 0.0062
2024-05-20 2023-03-31 13F/A-1 AVANTOR INC COM Stock 05352A100 9,576 -98 -1.01 202 -0.98 0.0068
2023-04-25 2023-03-31 13F AVANTOR INC COM Stock 05352A100 9,576 -98 202 0.0068
2023-02-06 2022-12-31 13F AVANTOR INC COM Stock 05352A100 9,674 563 6.18 204 13.97 0.0088
2022-11-10 2022-09-30 13F AVANTOR INC COM Stock 05352A100 9,111 -57 -0.62 179 -37.19 0.0082
2022-08-01 2022-06-30 13F AVANTOR INC COM Stock 05352A100 9,168 220 2.46 285 -7.47 0.0131
2022-04-28 2022-03-31 13F AVANTOR INC COM Stock 05352A100 8,948 -879 -8.94 308 -25.60 0.0122
2022-01-20 2021-12-31 13F AVANTOR INC COM Stock 05352A100 9,827 590 6.39 414 9.52 0.0154
2021-11-02 2021-09-30 13F/A-1 AVANTOR INC COM Stock 05352A100 9,237 422 4.79 378 20.77 0.0152
2021-08-06 2021-06-30 13F AVANTOR INC COM Stock 05352A100 8,815 -46 -0.52 313 22.27 0.0133
2021-04-23 2021-03-31 13F AVANTOR INC COM Stock 05352A100 8,861 108 1.23 256 4.07 0.0121
2021-02-02 2020-12-31 13F AVANTOR INC COM Stock 05352A100 8,753 53 0.61 246 25.51 0.0134
2020-10-27 2020-09-30 13F AVANTOR INC COM Stock 05352A100 8,700 0 0.00 196 33.33 0.0121
2020-07-16 2020-06-30 13F AVANTOR INC COM Stock 05352A100 8,700 -8 -0.09 147 36.11 0.0096
2020-04-27 2020-03-31 13F AVANTOR INC COM Stock 05352A100 8,708 8,708 108 0.0087
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-01-19 2021-12-31 13F AVANTOR INC COM Stock Call 0 -100.00 0 -100.00 n/a n/a n/a
2021-10-22 2021-09-30 13F AVANTOR INC COM Stock Call 8,815 313 n/a n/a n/a
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.