Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionArizona State Retirement System
Latest Disclosed Ownership20,297 shares
Latest Disclosed Value $ 2,783,328
Arizona State Retirement System reports 1.52% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 1, 2026 - Arizona State Retirement System filed a 13F-HR form disclosing ownership of 20,297 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $2,783,328 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 20,610 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -1.52% 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)
2026-05-01 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,297 -313 -1.52 2,783 -6.74 0.0163
2026-01-28 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,610 -1,216 -5.57 2,985 -1.42 0.0162
2025-11-03 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,826 319 1.48 3,027 22.55 0.0161
2025-08-13 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,507 378 1.79 2,470 7.63 0.0142
2025-05-01 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,129 -244 -1.14 2,296 -7.09 0.0146
2025-02-06 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,373 1,286 6.40 2,471 -21.74 0.0151
2024-11-12 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,087 531 2.72 3,157 0.64 0.0199
2024-08-05 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 19,556 286 1.48 3,137 -5.51 0.0209
2024-05-07 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 19,270 -528 -2.67 3,319 19.22 0.0230
2024-01-24 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 19,798 -529 -2.60 2,784 20.36 0.0211
2023-11-07 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,327 -208 -1.01 2,314 -0.98 0.0197
2023-08-01 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,535 1,329 6.92 2,336 44.47 0.0190
2023-04-27 2023-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 19,206 341 1.81 1,617 4.59 0.0145
2023-02-08 2022-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 18,865 527 2.87 1,546 -32.22 0.0149
2022-11-07 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 18,338 797 4.54 2,281 44.37 0.0236
2022-07-28 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 17,541 3,098 21.45 1,580 -7.93 0.0153
2022-05-04 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 14,443 199 1.40 1,716 -11.50 0.0138
2022-02-04 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 14,244 -382 -2.61 1,939 22.57 0.0148
2021-11-12 2021-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 14,626 176 1.22 1,582 -6.06 0.0129
2021-08-02 2021-06-30 13F ADVANCED DRAINAGE SYSTEMS IN COM 00790R104 14,450 -937 -6.09 1,684 5.85 0.0137
2021-05-06 2021-03-31 13F ADVANCED DRAINAGE SYSTEMS IN COM 00790R104 15,387 220 1.45 1,591 25.47 0.0139
2021-01-28 2020-12-31 13F ADVANCED DRAINAGE SYSTEMS IN COM 00790R104 15,167 -398 -2.56 1,268 30.45 0.0115
2020-11-05 2020-09-30 13F ADVANCED DRAINAGE SYSTEMS IN COM 00790R104 15,565 3,921 33.67 972 69.04 0.0097
2020-08-04 2020-06-30 13F ADVANCED DRAINAGE SYSTEMS IN COM 00790R104 11,644 -377 -3.14 575 62.43 0.0081
2020-05-05 2020-03-31 13F ADVANCED DRAINAGE SYSTEMS IN COM 00790R104 12,021 12,021 354 0.0061
2014-02-05 2013-12-31 13F WMS INDUSTRIES COM 929297109 0 -42,600 -100.00 0 -100.00
2013-11-01 2013-09-30 13F WMS INDUSTRIES COM 929297109 42,600 -500 -1.16 1,105 0.55 0.0142
2013-09-17 2013-06-30 13F WMS INDUSTRIES COM 929297109 43,100 -700 -1.60 1,099 -0.45 0.0150
2013-09-17 2013-03-31 13F WMS INDUSTRIES COM 929297109 43,800 43,800 1,104 0.0158
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.