Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionLegal & General Group Plc
Latest Disclosed Ownership234,949 shares
Latest Disclosed Value $ 32,218,555
Legal & General Group Plc reports 0.28% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 8, 2026 - Legal & General Group Plc filed a 13F-HR form disclosing ownership of 234,949 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $32,218,555 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 235,604 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -0.28% 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)
2026-05-08 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 234,949 -655 -0.28 32,219 -5.58 0.0075
2026-02-09 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 235,604 -2,114 -0.89 34,123 3.49 0.0076
2025-11-13 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 237,718 -16,214 -6.39 32,971 13.05 0.0074
2025-08-12 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 253,932 18,610 7.91 29,167 14.08 0.0072
2025-05-15 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 235,322 52,323 28.59 25,568 20.86 0.0070
2025-02-13 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 182,999 -265 -0.14 21,155 -26.55 0.0056
2025-02-28 2024-09-30 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 183,264 18,358 11.13 28,802 8.89 0.0076
2024-11-14 2024-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 190,514 18,358 29,941 0.0062
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 190,514 18,358 29,941 0.0032
2025-05-29 2024-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 164,906 3,671 2.28 26,449 -4.76 0.0075
2024-08-14 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 172,156 10,921 27,612 0.0062
2025-05-29 2024-03-31 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 161,235 -11,059 -6.42 27,771 14.61 0.0080
2024-07-01 2024-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 161,235 -11,059 27,771 0.0065
2024-05-14 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 161,235 -11,059 27,771 0.0033
2025-05-29 2023-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 172,294 -8,844 -4.88 24,231 17.52 0.0075
2024-02-15 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 172,294 -8,844 24,231 0.0062
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 181,138 -35,162 -16.26 20,619 -16.22 0.0072
2023-08-14 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 216,300 115,246 114.04 24,611 189.22 0.0080
2023-05-15 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 101,054 -14,651 -12.66 8,510 -10.28 0.0030
2023-02-14 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 115,705 -29,594 -20.37 9,484 -47.52 0.0036
2022-11-14 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 145,299 33,604 30.09 18,071 79.61 0.0071
2022-08-22 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 111,695 5,349 5.03 10,061 -20.37 0.0036
2022-05-16 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 106,346 -2,562 -2.35 12,634 -14.78 0.0038
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 108,908 8,804 8.79 14,825 36.91 0.0045
2021-11-15 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 100,104 24,213 31.90 10,828 22.39 0.0035
2021-08-12 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 75,891 18,744 32.80 8,847 49.75 0.0030
2021-05-17 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 57,147 15,905 38.57 5,908 71.40 0.0022
2021-02-12 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 41,242 7,017 20.50 3,447 61.30 0.0013
2020-11-13 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 34,225 -1,168 -3.30 2,137 22.25 0.0010
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 35,393 6,969 24.52 1,748 97.51 0.0008
2020-05-14 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 28,424 1,498 5.56 885 -15.39 0.0005
2020-02-13 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 26,926 3,241 13.68 1,046 36.91 0.0005
2019-11-13 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 23,685 4,428 22.99 764 20.89 0.0016
2019-08-14 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 19,257 2,510 14.99 632 46.30 0.0003
2019-05-15 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 16,747 316 1.92 432 8.54 0.0002
2019-02-15 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 16,431 779 4.98 398 -17.60 0.0003
2018-11-20 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 15,652 3,426 28.02 483 38.40 0.0003
2018-08-10 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 12,226 181 1.50 349 11.86 0.0003
2018-05-17 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 12,045 -2,094 -14.81 312 -7.69 0.0002
2018-02-13 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 14,139 694 5.16 338 23.36 0.0002
2017-11-09 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 13,445 -447 -3.22 274 -2.14 0.0002
2017-08-03 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 13,892 0 0.00 280 -7.59 0.0002
2017-05-12 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 13,892 -151 -1.08 303 4.84 0.0003
2017-02-13 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 14,043 3,918 38.70 289 18.93 0.0003
2016-10-12 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 10,125 1,026 11.28 243 0.00 0.0002
2016-08-16 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 9,099 0 0.00 243 29.95 0.0003
2016-05-16 2016-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 9,099 23 0.25 187 -13.02 0.0002
2016-02-16 2015-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 9,076 2,022 28.66 215 5.91 0.0002
2015-11-13 2015-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,054 1,582 28.91 203 24.54 0.0002
2015-07-31 2015-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 5,472 3,188 139.58 163 139.71 0.0002
2015-05-14 2015-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,284 2,284 68 0.0001
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.