Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership91,301 shares
Latest Disclosed Value $ 13,223,124
Alliancebernstein L.p. reports 0.46% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 91,301 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $13,223,124 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 90,883 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 0.46% 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)
2026-05-15 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 91,301 418 0.46 13,223 0.46 0.0036
2026-02-17 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 90,883 -35,589 -28.14 13,163 -24.96 0.0042
2025-11-14 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 126,472 38,029 43.00 17,542 72.68 0.0055
2025-08-14 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 88,443 447 0.51 10,159 6.26 0.0033
2025-05-15 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 87,996 -2,317 -2.57 9,561 -8.43 0.0035
2025-02-12 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 90,313 -3,483 -3.71 10,440 -29.17 0.0035
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 93,796 -1,595 -1.67 14,741 -3.65 0.0050
2024-08-14 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 95,391 -4,556 -4.56 15,300 -11.12 0.0053
2024-05-14 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 99,947 5,527 5.85 17,215 29.63 0.0061
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 94,420 5,885 6.65 13,279 31.78 0.0051
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 88,535 3,808 4.49 10,078 4.53 0.0043
2023-08-15 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 84,727 -1,153 -1.34 9,640 33.31 0.0039
2023-05-15 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 85,880 60,350 236.39 7,232 245.65 0.0031
2023-02-15 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 25,530 353 1.40 2,093 -33.18 0.0009
2022-11-15 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 25,177 -26,775 -51.54 3,131 -33.08 0.0015
2022-08-15 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 51,952 -65,658 -55.83 4,679 -66.51 0.0021
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 117,610 -44,761 -27.57 13,973 -36.79 0.0054
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 162,371 -65,966 -28.89 22,104 -10.51 0.0078
2021-11-10 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 228,337 17,566 8.33 24,699 0.53 0.0097
2021-07-30 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 210,771 105,832 100.85 24,570 126.45 0.0099
2021-05-06 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 104,939 382 0.37 10,850 24.16 0.0048
2021-02-08 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 104,557 7,327 7.54 8,739 43.95 0.0041
2020-11-12 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 97,230 6,490 7.15 6,071 35.42 0.0033
2020-08-13 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 90,740 17,453 23.81 4,483 107.74 0.0026
2020-05-14 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 73,287 1,597 2.23 2,158 -22.49 0.0015
2020-02-18 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 71,690 13,599 23.41 2,784 48.48 0.0016
2019-11-14 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 58,091 61 0.11 1,875 -1.47 0.0012
2019-08-14 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 58,030 -181 -0.31 1,903 26.87 0.0012
2019-05-14 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 58,211 51 0.09 1,500 6.38 0.0010
2019-02-13 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 58,160 -3,628 -5.87 1,410 -26.14 0.0010
2018-11-08 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 61,788 4,944 8.70 1,909 17.62 0.0012
2018-08-13 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 56,844 2,847 5.27 1,623 16.01 0.0011
2018-05-14 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 53,997 62 0.11 1,399 8.79 0.0010
2018-02-13 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 53,935 -1,997 -3.57 1,286 13.50 0.0009
2017-11-13 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 55,932 -11,786 -17.40 1,133 -16.75 0.0008
2017-08-10 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 67,718 609 0.91 1,361 -7.41 0.0011
2017-05-11 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 67,109 98 0.15 1,470 6.52 0.0012
2017-02-13 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 67,011 29 0.04 1,380 -14.39 0.0011
2016-11-10 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 66,982 -3,443 -4.89 1,612 -16.39 0.0014
2016-08-11 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 70,425 10,145 16.83 1,928 50.16 0.0017
2016-05-13 2016-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 60,280 1,040 1.76 1,284 -9.83 0.0011
2016-02-16 2015-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 59,240 2,710 4.79 1,424 -12.91 0.0012
2016-02-12 2015-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 59,240 1,714
2015-11-13 2015-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 56,530 -3,230 -5.40 1,635 -6.73 0.0014
2015-08-14 2015-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 59,760 45,700 325.04 1,753 316.39 0.0014
2015-05-13 2015-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 14,060 9,860 234.76 421 334.02 0.0003
2015-02-13 2014-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 4,200 4,200 -96.44 97 -96.83 0.0001
2014-02-13 2013-12-31 13F WMS INDUSTRIES COM 929297109 0 -117,954 -100.00 0 -100.00
2013-11-14 2013-09-30 13F WMS INDUSTRIES COM 929297109 117,954 -2,019 -1.68 3,061 0.00 0.0030
2013-08-13 2013-06-30 13F WMS INDUSTRIES COM 929297109 119,973 119,973 3,061 0.0032
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.