Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,191,778 shares
Latest Disclosed Value $ 163,396,426
Dimensional Fund Advisors Lp reports 0.23% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,191,778 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $163,396,426 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,189,064 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 0.23% 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)
2026-05-07 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,191,778 2,714 0.23 163,396 -5.13 0.0339
2026-02-12 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,189,064 50,686 4.45 172,224 9.08 0.0361
2025-11-12 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,138,378 16,118 1.44 157,889 22.48 0.0339
2025-08-12 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,122,260 90,578 8.78 128,908 15.00 0.0298
2025-05-13 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,031,682 224,015 27.74 112,090 20.06 0.0279
2025-02-13 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 807,667 22,805 2.91 93,363 -24.32 0.0224
2024-11-07 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 784,862 12,274 1.59 123,363 -0.45 0.0299
2024-08-09 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 772,588 94,019 13.86 123,920 6.03 0.0324
2024-05-10 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 678,569 45,177 7.13 116,877 31.19 0.0316
2024-02-07 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 633,392 15,690 2.54 89,086 26.70 0.0260
2023-11-09 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 617,702 -6,258 -1.00 70,313 -0.96 0.0231
2023-08-09 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 623,960 18,186 3.00 70,995 39.18 0.0226
2023-05-12 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 605,774 7,159 1.20 51,012 104,004.08 0.0172
2023-02-09 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 598,615 6,824 1.15 49 -99.93 0.0145
2022-11-10 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 591,791 -92,105 -13.47 73,599 19.48 0.0283
2022-08-12 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 683,896 -153,787 -18.36 61,599 -38.11 0.0221
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 837,683 -17,546 -2.05 99,531 -14.51 0.0307
2022-02-09 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 855,229 -36,012 -4.04 116,422 20.76 0.0352
2021-11-12 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 891,241 438 0.05 96,406 -7.16 0.0311
2021-08-12 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 890,803 -3,011 -0.34 103,841 12.37 0.0329
2021-05-14 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 893,814 -220,178 -19.76 92,411 -0.75 0.0306
2021-03-08 2020-12-31 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,113,992 34,795 3.22 93,107 38.17 0.0336
2021-02-11 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,113,992 34,795 93,107 33,625.2995
2020-11-12 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,079,197 -63,043 -5.52 67,385 19.42 0.0286
2020-08-13 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,142,240 -70,274 -5.80 56,427 58.09 0.0248
2020-05-14 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,212,514 -37,267 -2.98 35,693 -26.47 0.0186
2020-02-14 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,249,781 -46,175 -3.56 48,542 16.07 0.0177
2019-11-12 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,295,956 -19,692 -1.50 41,821 -3.06 0.0163
2019-08-13 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,315,648 -19,460 -1.46 43,139 25.39 0.0167
2019-08-12 2019-03-31 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,335,108 142,407 11.94 34,405 18.95 0.0137
2019-05-10 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,335,108 142,407 34,405
2019-02-26 2018-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,192,701 103,572 9.51 28,923 -14.06 0.0131
2019-02-13 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,192,701 103,572 28,923
2018-11-13 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,089,129 79,569 7.88 33,656 16.77 0.0128
2018-08-10 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,009,560 184,617 22.38 28,823 34.90 0.0115
2018-05-11 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 824,943 110,262 15.43 21,366 25.35 0.0089
2018-02-12 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 714,681 103,432 16.92 17,045 37.70 0.0071
2017-11-13 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 611,249 119,572 24.32 12,378 25.25 0.0054
2017-08-11 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 491,677 0 0.00 9,883 -8.22 0.0046
2017-05-12 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 491,677 -94 -0.02 10,768 6.30 0.0051
2017-02-09 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 491,771 47,414 10.67 10,130 -5.25 0.0051
2016-11-10 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 444,357 187,347 72.89 10,691 51.99 0.0058
2016-08-09 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 257,010 -182 -0.07 7,034 28.40 0.0040
2016-05-13 2016-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 257,192 27,920 12.18 5,478 -0.56 0.0033
2016-02-10 2015-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 229,272 229,272 -80.41 5,509 -81.86 0.0034
2014-02-12 2013-12-31 13F WMS INDS COM 929297109 0 -1,170,461 -100.00 0 -100.00
2013-11-13 2013-09-30 13F WMS INDS COM 929297109 1,170,461 -9,422 -0.80 30,373 0.91 0.0263
2013-08-15 2013-06-30 13F WMS INDS COM 929297109 1,179,883 1,179,883 30,099 0.0283
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.