Advanced Drainage Systems, Inc.
US ˙ NYSE ˙ US00790R1041

SecurityWMS / Advanced Drainage Systems, Inc.
InstitutionMan Group plc
Latest Disclosed Ownership95,764 shares
Latest Disclosed Value $ 13,132,117
Man Group plc reports 28.38% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 15, 2026 - Man Group plc filed a 13F-HR form disclosing ownership of 95,764 shares of Advanced Drainage Systems, Inc. (US:WMS) valued at $13,132,117 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 74,595 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 28.38% during the quarter. The current value of the position is $12,689,688 USD.

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 95,764 21,169 28.38 13,132 21.56 0.0238
2026-02-17 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 74,595 -46,218 -38.26 10,804 -35.53 0.0184
2025-11-14 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 120,813 -35,121 -22.52 16,757 -6.44 0.0291
2025-08-14 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 155,934 83,220 114.45 17,911 126.71 0.0341
2025-05-15 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 72,714 854 1.19 7,900 -4.90 0.0200
2025-02-14 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 71,860 2,700 3.90 8,307 -23.57 0.0219
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 69,160 -141,898 -67.23 10,869 -67.89 0.0283
2024-08-14 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 211,058 71,646 51.39 33,852 40.98 0.0855
2024-05-15 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 139,412 62,358 80.93 24,012 121.59 0.0605
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 77,054 10,837 -53.44 0.0302
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 23,272 60.63 0.0721
2023-08-14 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 127,326 14,487 146.08 0.0447
2023-05-15 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 5,887 -55.21 0.0209
2023-02-14 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 160,367 -15,198 -8.66 13,145 -39.80 0.0471
2022-11-14 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 175,565 21,836 321.54 0.1013
2022-08-15 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 5,180 -32.02 0.0220
2022-05-16 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 64,133 8,190 14.64 7,620 0.05 0.0265
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 55,943 4,381 8.50 7,616 36.54 0.0245
2021-11-15 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 51,562 681 1.34 5,578 -5.95 0.0196
2021-08-16 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 50,881 -15,823 -23.72 5,931 -14.01 0.0209
2021-05-17 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 66,704 19,896 42.51 6,897 76.30 0.0303
2021-02-16 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 46,808 -58,572 -55.58 3,912 -40.55 0.0172
2020-11-16 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 105,380 -47,873 -31.24 6,580 -13.09 0.0259
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 153,253 33,540 28.02 7,571 114.84 0.0382
2020-05-15 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 119,713 -103,442 -46.35 3,524 -59.34 0.0228
2020-02-18 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 223,155 72,870 48.49 8,667 78.70 0.0285
2019-11-14 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 150,285 150,285 4,850 0.0180
2018-08-14 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -14,040 -100.00 0 -100.00
2018-05-15 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 14,040 14,040 364 0.0017
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.