AdvanSix Inc.
MX ˙ BMV ˙ US00773T1016
SecurityMX:ASIX / AdvanSix Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership36,644 shares
Latest Disclosed Value $ 894,104
Rhumbline Advisers reports 3.68% decrease in ownership of ASIX / AdvanSix Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 36,644 shares of AdvanSix Inc. (MX:ASIX) valued at $894,104 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 38,043 shares of AdvanSix Inc.. This represents a change in shares of -3.68% during the quarter.

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)
2026-05-12 2026-03-31 13F ADVANSIX COM 00773T101 36,644 -1,399 -3.68 894 35.87 0.0008
2026-02-13 2025-12-31 13F ADVANSIX COM 00773T101 38,043 -43,909 -53.58 658 -58.56 0.0005
2025-11-06 2025-09-30 13F ADVANSIX COM 00773T101 81,952 154 0.19 1,588 -18.23 0.0013
2025-08-12 2025-06-30 13F ADVANSIX COM 00773T101 81,798 1,675 2.09 1,943 7.06 0.0017
2025-05-29 2025-03-31 13F/A-1 ADVANSIX COM 00773T101 80,123 -4,861 -5.72 1,815 -25.07 0.0017
2025-04-08 2025-03-31 13F ADVANSIX COM 00773T101 80,123 -4,861 1,815 0.0017
2025-05-29 2024-12-31 13F/A-1 ADVANSIX COM 00773T101 84,984 1,198 1.43 2,421 -4.87 0.0022
2025-01-30 2024-12-31 13F ADVANSIX COM 00773T101 84,984 1,198 2,421 0.0022
2024-11-12 2024-09-30 13F ADVANSIX COM 00773T101 83,786 -3,352 -3.85 2,545 27.44 0.0023
2024-08-01 2024-06-30 13F ADVANSIX COM 00773T101 87,138 -2,097 -2.35 1,997 -21.75 0.0019
2024-05-09 2024-03-31 13F ADVANSIX COM 00773T101 89,235 1,501 1.71 2,552 -2.89 0.0025
2024-02-08 2023-12-31 13F ADVANSIX COM 00773T101 87,734 -1,239 -1.39 2,628 -4.95 0.0028
2023-11-09 2023-09-30 13F ADVANSIX COM 00773T101 88,973 -10,939 -10.95 2,765 -20.86 0.0032
2023-08-08 2023-06-30 13F ADVANSIX COM 00773T101 99,912 9,914 11.02 3,495 116,366.67 0.0039
2023-05-11 2023-03-31 13F ADVANSIX COM 00773T101 89,998 3,404 3.93 3 -99.91 0.0042
2023-02-14 2022-12-31 13F ADVANSIX COM 00773T101 86,594 3,634 4.38 3,292 23.62 0.0044
2022-11-10 2022-09-30 13F ADVANSIX COM 00773T101 82,960 1,289 1.58 2,663 -2.49 0.0040
2022-08-11 2022-06-30 13F ADVANSIX COM 00773T101 81,671 780 0.96 2,731 -33.92 0.0040
2022-05-12 2022-03-31 13F ADVANSIX COM 00773T101 80,891 -1,825 -2.21 4,133 5.76 0.0053
2022-02-10 2021-12-31 13F ADVANSIX COM 00773T101 82,716 -2,976 -3.47 3,908 14.74 0.0048
2021-11-12 2021-09-30 13F ADVANSIX COM 00773T101 85,692 -11,166 -11.53 3,406 17.77 0.0046
2021-08-05 2021-06-30 13F ADVANSIX COM 00773T101 96,858 -5,334 -5.22 2,892 5.51 0.0038
2021-05-06 2021-03-31 13F ADVANSIX COM 00773T101 102,192 921 0.91 2,741 35.42 0.0037
2021-02-10 2020-12-31 13F ADVANSIX COM 00773T101 101,271 11,161 12.39 2,024 74.33 0.0028
2020-11-12 2020-09-30 13F ADVANSIX COM 00773T101 90,110 -5,955 -6.20 1,161 2.93 0.0018
2020-08-13 2020-06-30 13F ADVANSIX COM 00773T101 96,065 -9,682 -9.16 1,128 11.79 0.0019
2020-05-06 2020-03-31 13F ADVANSIX COM 00773T101 105,747 5,092 5.06 1,009 -49.78 0.0021
2020-02-05 2019-12-31 13F ADVANSIX COM 00773T101 100,655 4,320 4.48 2,009 -18.93 0.0034
2019-10-23 2019-09-30 13F ADVANSIX COM 00773T101 96,335 3,958 4.28 2,478 9.79 0.0045
2019-08-14 2019-06-30 13F ADVANSIX COM 00773T101 92,377 1,839 2.03 2,257 -12.76 0.0042
2019-05-01 2019-03-31 13F ADVANSIX COM 00773T101 90,538 339 0.38 2,587 17.86 0.0050
2019-01-31 2018-12-31 13F ADVANSIX COM 00773T101 90,199 14,201 18.69 2,195 -14.92 0.0048
2018-11-07 2018-09-30 13F ADVANSIX COM 00773T101 75,998 -1,336 -1.73 2,580 -8.93 0.0050
2018-08-06 2018-06-30 13F ADVANSIX COM 00773T101 77,334 3,630 4.93 2,833 10.53 0.0057
2018-05-02 2018-03-31 13F ADVANSIX COM 00773T101 73,704 1,751 2.43 2,563 -15.33 0.0054
2018-02-09 2017-12-31 13F ADVANSIX COM 00773T101 71,953 9,858 15.88 3,027 22.65 0.0061
2017-11-06 2017-09-30 13F ADVANSIX COM 00773T101 62,095 -14,343 -18.76 2,468 3.35 0.0054
2017-08-02 2017-06-30 13F ADVANSIX COM 00773T101 76,438 23,167 43.49 2,388 64.12 0.0055
2017-05-02 2017-03-31 13F ADVANSIX COM 00773T101 53,271 16,621 45.35 1,455 79.41 0.0034
2017-01-27 2016-12-31 13F ADVANSIX COM 00773T101 36,650 36,650 811 0.0021
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.