Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership183,319 shares
Latest Disclosed Value $ 25,138,489
Rhumbline Advisers reports 1.67% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 183,319 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $25,138,489 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 180,310 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 1.67% 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)
2026-05-12 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 183,319 3,009 1.67 25,138 -3.74 0.0215
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 180,310 -5,842 -3.14 26,114 1.14 0.0211
2025-11-06 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 186,152 -851 -0.46 25,819 20.21 0.0207
2025-08-12 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 187,003 -6,134 -3.18 21,479 2.36 0.0184
2025-05-29 2025-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM COM 00790R104 193,137 -1,702 -0.87 20,984 -6.83 0.0196
2025-04-08 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 193,137 -1,702 20,984 0.0196
2025-05-29 2024-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM COM 00790R104 194,839 -12,767 -6.15 22,523 -30.97 0.0201
2025-01-30 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 194,839 -12,767 22,523 0.0201
2024-11-12 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 207,606 6,139 3.05 32,627 0.97 0.0294
2024-08-01 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 201,467 -12,420 -5.81 32,313 -12.29 0.0304
2024-05-09 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 213,887 -4,267 -1.96 36,840 20.07 0.0354
2024-02-08 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 218,154 -11,863 -5.16 30,681 17.18 0.0322
2023-11-09 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 230,017 16,508 7.73 26,183 7.78 0.0304
2023-08-08 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 213,509 22,348 11.69 24,293 151,731.25 0.0272
2023-05-11 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 191,161 117,614 159.92 16 -99.73 0.0199
2023-02-14 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 73,547 3,761 5.39 6,029 -30.53 0.0081
2022-11-10 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 69,786 5,676 8.85 8,679 50.31 0.0129
2022-08-11 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 64,110 8,425 15.13 5,774 -12.73 0.0084
2022-05-12 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 55,685 -2,520 -4.33 6,616 -16.50 0.0085
2022-02-10 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 58,205 3,563 6.52 7,923 34.04 0.0097
2021-11-12 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 54,642 1,680 3.17 5,911 -4.26 0.0080
2021-08-05 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 52,962 -8,199 -13.41 6,174 -2.36 0.0081
2021-05-06 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 61,161 -8,670 -12.42 6,323 8.34 0.0086
2021-02-10 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 69,831 6,967 11.08 5,836 48.69 0.0081
2020-11-12 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 62,864 -11,425 -15.38 3,925 6.95 0.0062
2020-08-13 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 74,289 14,203 23.64 3,670 107.46 0.0061
2020-05-06 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 60,086 3,721 6.60 1,769 -19.19 0.0037
2020-02-05 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 56,365 7,789 16.03 2,189 39.60 0.0037
2019-10-23 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 48,576 -626 -1.27 1,568 -2.79 0.0029
2019-08-14 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 49,202 1,153 2.40 1,613 30.29 0.0030
2019-05-01 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 48,049 -1,083 -2.20 1,238 3.95 0.0024
2019-01-31 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 49,132 16,225 49.31 1,191 17.11 0.0026
2018-11-07 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 32,907 -8,520 -20.57 1,017 -14.03 0.0020
2018-08-06 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 41,427 8,979 27.67 1,183 40.83 0.0024
2018-05-02 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 32,448 -850 -2.55 840 5.79 0.0018
2018-02-09 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 33,298 -6,048 -15.37 794 -0.38 0.0016
2017-11-06 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 39,346 495 1.27 797 2.05 0.0017
2017-08-02 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 38,851 178 0.46 781 -7.79 0.0018
2017-05-02 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 38,673 665 1.75 847 8.17 0.0020
2017-01-27 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 38,008 2,622 7.41 783 -7.99 0.0020
2016-11-08 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 35,386 950 2.76 851 -9.76 0.0023
2016-08-11 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM COM 00790R104 34,436 2,279 7.09 943 37.66 0.0028
2016-05-02 2016-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 32,157 540 1.71 685 -9.87 0.0021
2016-02-03 2015-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 31,617 2,075 7.02 760 -11.11 0.0024
2015-11-04 2015-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 29,542 982 3.44 855 2.03 0.0029
2015-08-04 2015-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 28,560 16,235 131.72 838 127.10 0.0027
2015-05-12 2015-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 12,325 2,490 25.32 369 63.27 0.0011
2015-02-06 2014-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 9,835 9,835 -91.95 226 -92.87 0.0007
2014-02-03 2013-12-31 13F WMS INDUSTRIES INC COMMON STOC COM 929297109 0 -122,199 -100.00 0 -100.00
2013-11-05 2013-09-30 13F WMS INDUSTRIES INC COMMON STOC COM 929297109 122,199 130 0.11 3,171 1.83 0.0098
2013-08-07 2013-06-30 13F WMS INDUSTRIES INC COMMON STOC COM 929297109 122,069 122,069 3,114 0.0100
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.