Avantor, Inc.
US ˙ NYSE ˙ US05352A1007

SecurityAVTR / Avantor, Inc.
InstitutionWalleye Capital LLC
Latest Disclosed Ownership14,820 shares
Latest Disclosed Value $ 116,189
Walleye Capital LLC ownership in AVTR / Avantor, Inc.

On May 13, 2026 - Walleye Capital LLC filed a 13F-HR/A form disclosing ownership of 14,820 shares of Avantor, Inc. (US:AVTR) valued at $116,189 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 991,436 shares of Avantor, Inc.. This represents a change in shares of -98.51% during the quarter. The current value of the position is $134,417 USD.

Walleye Capital 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 38,700 of underlying shares valued at $303,408 USD and put options representing 22,300 of underlying shares valued at $174,832 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)
2026-05-13 2026-03-31 13F/A-1 AVANTOR COM 05352A100 14,820 -976,616 -98.51 116 -98.98 0.0005
2026-05-08 2026-03-31 13F AVANTOR COM 05352A100 14,820 -976,616 116 0.0005
2026-02-13 2025-12-31 13F AVANTOR COM 05352A100 991,436 -37,792 -3.67 11,362 -11.55 0.0349
2025-11-14 2025-09-30 13F AVANTOR COM 05352A100 1,029,228 -867,701 -45.74 12,845 -49.69 0.0482
2025-08-13 2025-06-30 13F AVANTOR COM 05352A100 1,896,929 1,138,250 150.03 25,533 107.61 0.0992
2025-05-14 2025-03-31 13F AVANTOR COM 05352A100 758,679 16,304 2.20 12,298 -21.37 0.0555
2025-02-13 2024-12-31 13F AVANTOR COM 05352A100 742,375 -79,137 -9.63 15,642 -26.40 0.0382
2024-11-14 2024-09-30 13F AVANTOR COM 05352A100 821,512 193,323 30.77 21,253 59.59 0.0442
2024-08-14 2024-06-30 13F AVANTOR COM 05352A100 628,189 162,341 34.85 13,318 11.80 0.0238
2024-05-15 2024-03-31 13F AVANTOR COM 05352A100 465,848 -183,644 -28.28 11,912 -19.67 0.0212
2024-02-14 2023-12-31 13F AVANTOR COM 05352A100 649,492 -31,483 -4.62 14,828 3.30 0.0314
2023-11-21 2023-09-30 13F/A-1 AVANTOR COM 05352A100 680,975 320,663 89.00 14,355 93.97 0.0367
2023-11-14 2023-09-30 13F AVANTOR COM 05352A100 680,975 320,663 14,355 0.0369
2023-08-14 2023-06-30 13F AVANTOR COM 05352A100 360,312 -123,538 -25.53 7,401 -27.65 0.0268
2023-05-15 2023-03-31 13F AVANTOR COM 05352A100 483,850 478,964 9,802.78 10,229 9,830.10 0.1532
2023-02-14 2022-12-31 13F AVANTOR COM 05352A100 4,886 -371,200 -98.70 103 -98.60 0.0019
2022-11-14 2022-09-30 13F AVANTOR COM 05352A100 376,086 54,123 16.81 7,371 -26.39 0.1407
2022-08-19 2022-06-30 13F/A-1 AVANTOR COM 05352A100 321,963 202,575 169.68 10,013 147.97 0.2759
2022-08-08 2022-06-30 13F AVANTOR COM 05352A100 321,963 202,575 10,013 0.2759
2022-05-27 2022-03-31 13F/A-01 AVANTOR COM 05352A100 119,388 119,388 4,038 0.1079
2022-05-16 2022-03-31 13F AVANTOR COM 05352A100 119,388 119,388 4,038 0.0822
2021-02-16 2020-12-31 13F AVANTOR COM 05352A100 0 -10,388 -100.00 0 -100.00
2020-11-16 2020-09-30 13F AVANTOR COM 05352A100 10,388 10,388 234 0.0261
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
(%)
2026-05-13 2026-03-31 13F/A AVANTOR COM Call 38,700 -64.13 303 -75.49 n/a n/a n/a
2026-05-08 2026-03-31 13F AVANTOR COM Call 38,700 303 n/a n/a n/a
2026-02-13 2025-12-31 13F AVANTOR COM Call 107,900 30.47 1,237 19.77 n/a n/a n/a
2025-11-14 2025-09-30 13F AVANTOR COM Call 82,700 109.90 1,032 94.72 n/a n/a n/a
2025-08-13 2025-06-30 13F AVANTOR COM Call 39,400 530 n/a n/a n/a
2025-05-14 2025-03-31 13F AVANTOR COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-13 2024-12-31 13F AVANTOR COM Call 30,200 -54.38 636 -62.85 n/a n/a n/a
2024-11-14 2024-09-30 13F AVANTOR COM Call 66,200 549.02 1,713 692.59 n/a n/a n/a
2024-08-14 2024-06-30 13F AVANTOR COM Call 10,200 -20.93 216 -34.35 n/a n/a n/a
2024-05-15 2024-03-31 13F AVANTOR COM Call 12,900 290.91 330 338.67 n/a n/a n/a
2024-02-14 2023-12-31 13F AVANTOR COM Call 3,300 -88.04 75 -87.09 n/a n/a n/a
2023-11-21 2023-09-30 13F/A AVANTOR COM Call 27,600 -59.88 582 -58.88 n/a n/a n/a
2023-11-14 2023-09-30 13F AVANTOR COM Call 27,600 582 n/a n/a n/a
2023-08-14 2023-06-30 13F AVANTOR COM Call 68,800 214.16 1,413 205.84 n/a n/a n/a
2023-05-15 2023-03-31 13F AVANTOR COM Call 21,900 184.42 463 185.19 n/a n/a n/a
2023-02-14 2022-12-31 13F AVANTOR COM Call 7,700 -64.02 162 -61.34 n/a n/a n/a
2022-11-14 2022-09-30 13F AVANTOR COM Call 21,400 419 n/a n/a n/a
Disclosed Put 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
(%)
2026-05-13 2026-03-31 13F/A AVANTOR COM Put 22,300 -71.08 175 -80.29 n/a n/a n/a
2026-05-08 2026-03-31 13F AVANTOR COM Put 22,300 175 n/a n/a n/a
2026-02-13 2025-12-31 13F AVANTOR COM Put 77,100 19.35 884 9.55 n/a n/a n/a
2025-11-14 2025-09-30 13F AVANTOR COM Put 64,600 78.95 806 66.19 n/a n/a n/a
2025-08-13 2025-06-30 13F AVANTOR COM Put 36,100 486 n/a n/a n/a
2025-05-14 2025-03-31 13F AVANTOR COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-13 2024-12-31 13F AVANTOR COM Put 5,200 -49.02 110 -58.56 n/a n/a n/a
2024-11-14 2024-09-30 13F AVANTOR COM Put 10,200 385.71 264 497.73 n/a n/a n/a
2024-08-14 2024-06-30 13F AVANTOR COM Put 2,100 50.00 45 25.71 n/a n/a n/a
2024-05-15 2024-03-31 13F AVANTOR COM Put 1,400 -96.83 36 -96.53 n/a n/a n/a
2024-02-14 2023-12-31 13F AVANTOR COM Put 44,200 64.31 1,009 77.95 n/a n/a n/a
2023-11-21 2023-09-30 13F/A AVANTOR COM Put 26,900 -16.72 567 -14.48 n/a n/a n/a
2023-11-14 2023-09-30 13F AVANTOR COM Put 26,900 567 n/a n/a n/a
2023-08-14 2023-06-30 13F AVANTOR COM Put 32,300 336.49 663 325.00 n/a n/a n/a
2023-05-15 2023-03-31 13F AVANTOR COM Put 7,400 7,300.00 156 7,700.00 n/a n/a n/a
2023-02-14 2022-12-31 13F AVANTOR COM Put 100 -99.61 2 -99.60 n/a n/a n/a
2022-11-14 2022-09-30 13F AVANTOR COM Put 25,600 502 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.