Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionComerica Bank
Latest Disclosed Ownership26,946 shares
Latest Disclosed Value $ 3,902,609
Comerica Bank reports 4.22% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 26,946 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $3,902,609 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 28,134 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -4.22% 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)
2026-01-29 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 26,946 -1,188 -4.22 3,903 0.00 0.0156
2025-11-14 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 28,134 -82 -0.29 3,902 20.43 0.0147
2025-08-14 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 28,216 1,791 6.78 3,241 12.85 0.0126
2025-05-14 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 26,425 5,003 23.35 2,871 15.95 0.0121
2025-02-14 2024-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 21,422 -853 -3.83 2,476 -29.26 0.0100
2025-02-14 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,422 -853 2,476 0.0083
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 22,275 -2,767 -11.05 3,501 -12.85 0.0138
2024-08-15 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COMMON 00790R104 25,042 -2,484 -9.02 4,017 -15.27 0.0167
2024-05-16 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COMMON 00790R104 27,526 -1,251 -4.35 4,741 17.12 0.0204
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COMMON 00790R104 28,777 -125 -0.43 4,047 23.05 0.0186
2023-11-21 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COMMON 00790R104 28,902 -234,209 -89.02 3,290 0.0171
2023-08-22 2023-06-30 13F ADVANCED DRAIN SYS INC DEL EQU 00790R104 263,111 154,316 141.84 0 -100.00
2023-01-26 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 108,795 -2,816 -2.52 10 -99.93 0.0764
2022-10-28 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 111,611 1,759 1.60 13,570 24.32 0.1144
2022-08-02 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 109,852 19,989 22.24 10,915 7.83 0.0896
2022-04-27 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 89,863 1,435 1.62 10,122 6.57 0.0735
2022-02-18 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 88,428 -10,154 -10.30 9,498 -10.43 0.0699
2021-11-22 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 98,582 -15,201 -13.36 10,604 -16.07 0.0639
2021-08-26 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 113,783 10,928 10.62 12,635 6.80 0.0754
2021-04-28 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 102,855 31,235 43.61 11,830 75.62 0.0705
2021-01-28 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 71,620 38,335 115.17 6,736 205.49 0.0427
2020-10-30 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 33,285 8,507 34.33 2,205 78.69 0.0160
2020-07-31 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 24,778 24,778 -25.56 1,234 -44.04 0.0095
2018-11-01 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 0 -53,192 -100.00 0 -100.00
2018-08-01 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 53,192 -37,165 -41.13 1,537 -33.55 0.0107
2018-05-01 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 90,357 -31,036 -25.57 2,313 -22.69 0.0165
2018-02-02 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 121,393 31,759 35.43 2,992 81.44 0.0199
2017-11-06 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 89,634 56,488 170.42 1,649 91.74 0.0119
2013-11-12 2013-09-30 13F WMS INDS COM 929297109 33,146 33,146 860 0.0060
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.