Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionAllianz Asset Management GmbH
Latest Disclosed Ownership381,401 shares
Latest Disclosed Value $ 52,301,519
Allianz Asset Management GmbH reports 20.19% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 11, 2026 - Allianz Asset Management GmbH filed a 13F-HR form disclosing ownership of 381,401 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $52,301,519 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 477,885 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -20.19% 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)
2026-05-11 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 381,401 -96,484 -20.19 52,302 -24.43 0.0205
2026-02-11 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 477,885 -28,018 -5.54 69,212 -1.36 0.0700
2025-11-04 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 505,903 -82,041 -13.95 70,169 3.90 0.0784
2025-07-28 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 587,944 27,256 4.86 67,531 10.86 0.0808
2025-05-05 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 560,688 14,472 2.65 60,919 -3.52 0.0797
2025-02-03 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 546,216 18,023 3.41 63,143 -23.93 0.0843
2024-11-13 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 528,193 51,238 10.74 83,011 8.51 0.1161
2024-08-13 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 476,955 116,899 32.47 76,499 23.35 0.1133
2024-05-14 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 360,056 205,217 132.54 62,016 184.79 0.0957
2024-02-12 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 154,839 95,370 160.37 21,777 221.70 0.0356
2023-11-13 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 59,469 -30,236 -33.71 6,769 -33.68 0.0114
2023-08-14 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 89,705 84 0.09 10,207 35.25 0.0183
2023-05-11 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 89,621 -144,546 -61.73 7,547 -60.69 0.0134
2023-02-13 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 234,167 146,677 167.65 19,195 76.40 0.0373
2022-11-08 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 87,490 13,318 17.96 10,881 62.86 0.0221
2022-08-12 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 74,172 449 0.61 6,681 -23.72 0.0063
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 73,723 -401 -0.54 8,759 -12.75 0.0065
2022-02-11 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 74,124 8,172 12.39 10,039 40.72 0.0070
2021-11-10 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 65,952 196 0.30 7,134 -6.93 0.0056
2021-08-16 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 65,756 38,468 140.97 7,665 171.62 0.0065
2021-05-13 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 27,288 6,589 31.83 2,822 63.12 0.0027
2021-02-16 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,699 11,699 129.99 1,730 207.83 0.0017
2020-11-13 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 9,000 -2,608 -22.47 562 -1.92 0.0007
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 11,608 -25,441 -68.67 573 -47.48 0.0007
2020-05-14 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 37,049 6,637 21.82 1,091 -7.70 0.0015
2020-02-13 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 30,412 30,412 -67.65 1,182 -51.54 0.0011
2014-02-13 2013-12-31 13F WMS INDS COM 929297109 0 -93,995 -100.00 0 -100.00
2013-11-14 2013-09-30 13F WMS INDS COM 929297109 93,995 10,300 12.31 2,439 14.24 0.0032
2013-08-14 2013-06-30 13F WMS INDS COM 929297109 83,695 83,695 2,135 0.0030
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.