Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionSchroder Investment Management Group
Latest Disclosed Ownership525,787 shares
Latest Disclosed Value $ 69,119,959
Schroder Investment Management Group reports 14.82% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 14, 2026 - Schroder Investment Management Group filed a 13F-HR form disclosing ownership of 525,787 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $69,119,959 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 617,285 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -14.82% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-14 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 525,787 -91,498 -14.82 69,120 -23.80 0.0112
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 617,285 -13,114 -2.08 90,710 4.27 0.0688
2025-11-13 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 630,399 89,905 16.63 86,995 40.13 0.0681
2025-08-13 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 540,494 -36,457 -6.32 62,081 -0.56 0.0525
2025-05-13 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 576,951 175,939 43.87 62,432 35.58 0.0630
2025-02-12 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 401,012 86,141 27.36 46,048 -8.76 0.0441
2024-11-13 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 314,871 268,270 575.67 50,471 575.27 0.0517
2024-08-12 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 46,601 12,444 36.43 7,474 27.04 0.0082
2024-05-14 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 34,157 -469 -1.35 5,883 20.83 0.0069
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 34,626 11,264 48.22 4,870 83.11 0.0063
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 23,362 -7,086 -23.27 2,659 -23.24 0.0040
2023-08-11 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 30,448 -968 -3.08 3,464 30.96 0.0050
2023-05-11 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 31,416 0 0.00 2,646 2.72 0.0039
2023-02-10 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 31,416 0 0.00 2,575 -34.09 0.0041
2022-11-14 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 31,416 31,416 3,907 0.0065
2022-05-16 2022-03-31 13F Advanced Drainage Systems COM 00790R104 0 -3,085 -100.00 0 -100.00
2022-02-14 2021-12-31 13F Advanced Drainage Systems COM 00790R104 3,085 -13,457 -81.35 420 -76.52 0.0005
2021-11-12 2021-09-30 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 16,542 3,085 22.92 1,789 14.02 0.0028
2021-08-13 2021-06-30 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 13,457 -774 -5.44 1,569 6.66 0.0020
2021-05-28 2021-03-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 14,231 0 0.00 1,471 147,000.00 0.0019
2021-05-17 2021-03-31 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 14,231 0 1,471 0.0019
2021-02-24 2020-12-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 14,231 14,231 1 0.0017
2021-02-16 2020-12-31 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 14,231 14,231 1 0.0017
2017-05-10 2017-03-31 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 0 -46,889 -100.00 0 -100.00
2017-02-10 2016-12-31 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 46,889 -783,611 -94.35 966 -95.17 0.0018
2016-11-09 2016-09-30 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 830,500 414,500 99.64 19,982 75.50 0.0373
2016-08-08 2016-06-30 13F ADVANCED DRAINAGE SYSTEMS INCORPORATED USD0.01 COM 00790R104 416,000 416,000 11,386 0.0229
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.