Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionStandard Life Aberdeen plc
Latest Disclosed Ownership205,725 shares
Latest Disclosed Value $ 28,211,069
Standard Life Aberdeen plc reports 27.89% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On April 29, 2026 - Standard Life Aberdeen plc filed a 13F-HR form disclosing ownership of 205,725 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $28,211,069 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 285,306 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -27.89% 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)
2026-04-29 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 205,725 -79,581 -27.89 28,211 -31.73 0.0247
2026-01-16 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 285,306 -2,607 -0.91 41,321 4.00 0.0357
2025-11-07 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 287,913 -51,208 -15.10 39,732 2.91 0.0628
2025-07-24 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 339,121 -196,035 -36.63 38,607 -32.70 0.0657
2025-05-13 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 535,156 -8,895 -1.63 57,363 -8.66 0.1119
2025-01-24 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 544,051 -35,434 -6.11 62,805 -31.50 0.1179
2024-10-25 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 579,485 128,539 28.50 91,683 26.76 0.1681
2024-08-09 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 450,946 46,735 11.56 72,327 3.89 0.1386
2024-05-09 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 404,211 26,624 7.05 69,621 31.11 0.1365
2024-01-31 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 377,587 234,883 164.59 53,104 226.93 0.1151
2023-11-07 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 142,704 -581 -0.41 16,244 -0.36 0.0415
2024-06-20 2023-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 143,285 48,869 51.76 16,303 105.06 0.0379
2023-08-04 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 143,285 48,869 16,303 0.0379
2024-06-20 2023-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 94,416 10,903 13.06 7,951 16.14 0.0199
2023-04-28 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 94,416 10,903 7,951 0.0199
2024-06-20 2022-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 83,513 385 0.46 6,846 -33.79 0.0186
2023-02-10 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 83,513 385 6,846 0.0186
2022-11-10 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 83,128 22,552 37.23 10,338 87.96 0.0308
2022-08-05 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 60,576 100 0.17 5,500 -24.89 0.0173
2022-05-04 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 60,476 1,257 2.12 7,323 -9.16 0.0187
2022-02-10 2021-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 59,219 59,219 8,061 0.0177
2022-02-08 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 59,219 59,219 8,061 0.0058
2021-08-10 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -156,038 -100.00 0 -100.00
2021-05-06 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 156,038 59,841 62.21 16,151 100.83 0.0367
2021-02-10 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 96,197 96,197 8,042 0.0196
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.