Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership2,489,531 shares
Latest Disclosed Value $ 341,389,386
State Street Corp reports 0.81% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 2,489,531 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $341,389,386 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,469,430 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 0.81% 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)
2026-05-15 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,489,531 20,101 0.81 341,389 -4.55 0.0118
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,469,430 -82,471 -3.23 357,648 1.05 0.0120
2025-11-14 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,551,901 75,777 3.06 353,949 24.45 0.0123
2025-08-14 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,476,124 -111,184 -4.30 284,408 1.17 0.0107
2025-05-15 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,587,308 -77,076 -2.89 281,111 -8.73 0.0116
2025-02-14 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,664,384 122,696 4.83 308,003 -22.89 0.0122
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,541,688 206,105 8.82 399,452 6.63 0.0163
2024-08-14 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,335,583 1,260 0.05 374,604 -6.83 0.0164
2024-05-15 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,334,323 41,273 1.80 402,064 24.67 0.0180
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,293,050 73,719 3.32 322,495 27.66 0.0157
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,219,331 192,085 9.48 252,626 9.52 0.0140
2023-08-14 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,027,246 -27,140 -1.32 230,660 33.33 0.0121
2023-05-15 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,054,386 735,476 55.76 173,000 60.02 0.0098
2023-05-15 2022-12-31 13F/A-99 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,318,910 137,180 11.61 108,111 -26.44 0.0064
2023-05-15 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,318,910 137,180 108,111 0.0064
2022-11-15 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,181,730 37,860 3.31 146,972 42.65 0.0093
2022-08-15 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,143,870 263,308 29.90 103,028 -1.52 0.0062
2022-05-16 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 880,562 36,660 4.34 104,620 -8.93 0.0052
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 843,902 45,708 5.73 114,880 33.05 0.0054
2021-11-15 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 798,194 21,792 2.81 86,341 -4.60 0.0046
2021-08-16 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 776,402 -283,504 -26.75 90,505 -17.41 0.0048
2021-07-09 2021-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,059,906 -31,704 -2.90 109,584 20.11 0.0063
2021-05-17 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,059,906 -31,704 109,584 0.0063
2021-02-16 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,091,610 34,888 3.30 91,237 38.28 0.0056
2020-11-10 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,056,722 47,639 4.72 65,982 32.36 0.0045
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,009,083 87,798 9.53 49,849 83.79 0.0036
2020-06-19 2020-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 921,285 46,407 5.30 27,123 -20.18 0.0024
2020-05-11 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 921,285 46,407 27,123 2,381.9455
2020-02-06 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 874,878 95,110 12.20 33,980 35.04 0.0023
2019-11-14 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 779,768 9,030 1.17 25,163 -0.43 0.0019
2019-08-14 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 770,738 21,874 2.92 25,272 30.96 0.0019
2019-05-15 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 748,864 -21,399 -2.78 19,298 3.31 0.0015
2019-02-12 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 770,263 -21,393 -2.70 18,679 -23.63 0.0017
2018-11-09 2018-09-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 791,656 -26,977 -3.30 24,459 4.66 0.0019
2018-08-14 2018-06-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 818,633 120,018 17.18 23,371 29.16 0.0020
2018-05-15 2018-03-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 698,615 7,302 1.06 18,095 9.74 0.0015
2018-02-14 2017-12-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 691,313 28,552 4.31 16,489 22.86 0.0013
2017-11-14 2017-09-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 662,761 2,672 0.40 13,421 1.18 0.0012
2017-08-14 2017-06-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 660,089 36,049 5.78 13,265 -2.96 0.0012
2017-05-15 2017-03-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 624,040 29,000 4.87 13,669 11.57 0.0012
2017-02-09 2016-12-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 595,040 26,576 4.68 12,252 -10.39 0.0012
2017-01-13 2016-09-30 13F/A-1 ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 568,464 23,327 4.28 13,672 -8.38 0.0014
2016-11-14 2016-09-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 568,464 13,672
2016-08-12 2016-06-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 545,137 17,060 3.23 14,922 32.66 0.0016
2016-05-20 2016-03-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 528,077 11,476 2.22 11,248 -9.37 0.0012
2016-05-12 2016-03-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 528,077 11,248
2016-02-16 2015-12-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 516,601 14,684 2.93 12,411 -14.51 0.0014
2015-11-16 2015-09-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 501,917 68,109 15.70 14,517 14.09 0.0017
2015-08-13 2015-06-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 433,808 206,225 90.62 12,724 86.68 0.0014
2015-05-15 2015-03-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 227,583 29,168 14.70 6,816 49.60 0.0007
2015-02-11 2014-12-31 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 198,415 61,915 45.36 4,556 59.30 0.0005
2014-11-12 2014-09-30 13F/A-1 ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 136,500 -1,786,060 -92.90 2,860 -94.27 0.0003
2014-11-10 2014-09-30 13F ADVANCED DRAINAGE SYSTEMS Common equity shares 00790R104 136,500 2,860
2013-11-12 2013-09-30 13F WMS INDUSTRIES Common equity shares 929297109 1,922,560 -10,678 -0.55 49,885 1.15 0.0061
2013-08-08 2013-06-30 13F WMS INDUSTRIES Common equity shares 929297109 1,933,238 1,933,238 49,317 0.0064
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.