Advanced Drainage Systems, Inc.
US ˙ NYSE ˙ US00790R1041

SecurityWMS / Advanced Drainage Systems, Inc.
InstitutionDynamic Technology Lab Private Ltd
Latest Disclosed Ownership13,425 shares
Latest Disclosed Value $ 1,840,970
Dynamic Technology Lab Private Ltd reports 211.05% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 15, 2026 - Dynamic Technology Lab Private Ltd filed a 13F-HR form disclosing ownership of 13,425 shares of Advanced Drainage Systems, Inc. (US:WMS) valued at $1,840,970 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 4,316 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 211.05% during the quarter. The current value of the position is $1,778,947 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 13,425 9,109 211.05 1,841 194.40 0.2991
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,316 4,316 625 0.1416
2025-11-13 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -1,770 -100.00 0 -100.00
2025-08-12 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,770 1,770 203 0.0276
2024-08-15 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -1,631 -100.00 0 0.0000
2024-05-14 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,631 1,631 0 0.0300
2024-02-09 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -18,694 -100.00 0 -100.00
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 18,694 18,694 2 0.2128
2023-05-12 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -11,064 -100.00 0 -100.00
2023-02-14 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 11,064 284 2.63 907 -32.36 0.0907
2022-11-14 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 10,780 10,780 1,341 0.1323
2022-05-16 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -5,468 -100.00 0 -100.00
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 5,468 5,468 744 0.0824
2021-08-13 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -7,365 -100.00 0 -100.00
2021-05-14 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,365 7,365 761 0.0859
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS COM 00790R104 0 -17,961 -100.00 0 -100.00
2020-05-13 2020-03-31 13F ADVANCED DRAIN SYS COM 00790R104 17,961 17,961 529 0.1032
2020-02-14 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -11,392 -100.00 0 -100.00
2019-11-14 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 11,392 11,392 368 0.0646
2019-05-13 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -13,238 -100.00 0 -100.00
2019-02-13 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 13,238 13,238 321 0.0555
2018-11-14 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -10,950 -100.00 0 -100.00
2018-08-14 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 10,950 -5,638 -33.99 312 -27.44 0.0470
2018-06-14 2018-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 16,588 16,588 430 0.0640
2018-05-14 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 26,540 26,540 688
2017-08-17 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -17,171 -100.00 0 -100.00
2017-05-11 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 17,171 3,634 26.84 376 34.77 0.0883
2017-02-13 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 13,537 13,537 279 0.0749
2016-11-14 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -10,503 -100.00 0 -100.00
2016-08-10 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 10,503 10,503 0.00 287 0.0777
2015-11-16 2015-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -10,238 -100.00 0 -100.00
2015-08-13 2015-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 10,238 10,238 300 0.1739
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.