Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,333,340 shares
Latest Disclosed Value $ 182,841,559
Morgan Stanley reports 22.03% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,333,340 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $182,841,559 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,710,126 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -22.03% 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 1,333,340 -376,786 -22.03 182,842 -26.18 0.0110
2026-05-27 2025-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,710,126 -290,887 -14.54 247,678 -10.76 0.0148
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,710,126 -290,887 247,678 0.0148
2026-05-27 2025-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 2,001,013 326,712 19.51 277,541 44.32 0.0168
2025-11-14 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,001,013 326,712 277,541 0.0168
2025-08-15 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,674,301 128,918 8.34 192,311 14.53 0.0125
2025-05-15 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,545,383 305,606 24.65 167,906 17.16 0.0120
2025-05-15 2024-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,239,777 46,154 3.87 143,318 -23.60 0.0100
2025-02-14 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,239,777 46,154 143,318 0.0100
2025-05-14 2024-09-30 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,193,623 82,775 7.45 187,590 5.29 0.0136
2025-02-14 2024-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,193,623 82,775 187,590 0.0136
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,193,623 82,775 187,590 0.0136
2025-05-14 2024-06-30 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,110,848 -1,876 -0.17 178,169 -7.04 0.0138
2024-10-17 2024-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,110,848 -1,876 178,169 0.0138
2024-08-14 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,110,848 -1,876 178,169 0.0138
2024-10-17 2024-03-31 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,112,724 -64,612 -5.49 191,656 15.75 0.0154
2024-08-16 2024-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,112,724 -64,612 191,656 0.0018
2024-05-15 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,112,724 -64,612 191,656 0.0154
2024-08-16 2023-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,177,336 -392,942 -25.02 165,581 -7.36 0.0146
2024-02-13 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,177,336 -392,942 165,581 0.0146
2023-11-15 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,570,278 204,267 14.95 178,745 15.00 0.0182
2023-08-14 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,366,011 1,950 0.14 155,425 35.31 0.0153
2023-05-15 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,364,061 240,289 21.38 114,868 24.70 0.0123
2023-02-14 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,123,772 761,995 210.63 92,116 104.73 0.0105
2022-11-14 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 361,777 -36,054 -9.06 44,994 25.57 0.0061
2022-10-27 2022-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 397,831 182,588 84.83 35,833 40.11 0.0047
2022-08-15 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 397,831 182,588 35,833 0.0047
2022-10-27 2022-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 215,243 -193,432 -47.33 25,574 -54.03 0.0034
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 215,243 -193,432 25,574 0.0034
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 408,675 175,433 75.22 55,632 120.49 0.0069
2021-11-15 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 233,242 44,462 23.55 25,231 14.66 0.0034
2021-08-23 2021-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 188,780 -80,857 -29.99 22,005 -21.06 0.0029
2021-08-16 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 188,780 -80,857 22,005 0.0006
2021-05-17 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 269,637 -24,540 -8.34 27,877 13.38 0.0041
2021-02-16 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 294,177 250,032 566.39 24,588 792.16 0.0038
2020-11-13 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 44,145 3,268 7.99 2,756 36.44 0.0005
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 40,877 7,570 22.73 2,020 106.12 0.0004
2020-05-26 2020-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 33,307 -245,826 -88.07 980 -90.96 0.0003
2020-05-15 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 33,307 -245,826 980 75.2844
2020-02-14 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 279,133 169,276 154.09 10,841 205.81 0.0025
2019-11-14 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 109,857 53,606 95.30 3,545 92.14 0.0009
2019-08-14 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 56,251 -8,995 -13.79 1,845 9.76 0.0005
2019-05-15 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 65,246 -106,939 -62.11 1,681 -59.75 0.0005
2019-02-14 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 172,185 -229,626 -57.15 4,176 -66.37 0.0012
2019-04-23 2018-09-30 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 401,811 71,056 21.48 12,416 31.48 0.0031
2018-11-20 2018-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 401,811 0 12,416 0.0031
2018-11-14 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 401,811 71,056 12,416
2019-04-23 2018-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 330,755 122,337 58.70 9,443 74.94 0.0026
2018-08-14 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 330,755 122,337 9,443
2019-04-23 2018-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 208,418 105,400 102.31 5,398 119.70 0.0015
2018-05-14 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 208,418 105,400 5,398
2019-04-23 2017-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 103,018 54,817 113.73 2,457 151.74 0.0007
2018-02-14 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 103,018 54,817 2,457
2017-11-14 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 48,201 12,093 33.49 976 34.44 0.0003
2017-08-11 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 36,108 -13,377 -27.03 726 -33.03 0.0002
2017-05-22 2017-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 49,485 -53,305 -51.86 1,084 -48.80 0.0003
2017-05-12 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 49,485 1,084
2017-02-22 2016-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 102,790 89,051 648.16 2,117 539.58 0.0007
2017-02-13 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 102,790 2,117
2016-11-10 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 13,739 5,874 74.69 331 53.95 0.0001
2016-08-12 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,865 -16,218 -67.34 215 -58.09 0.0001
2016-05-12 2016-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 24,083 20,863 647.92 513 566.23 0.0002
2016-02-09 2015-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,220 -1,204 -27.22 77 -39.84 0.0000
2016-02-08 2015-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 4,424 -3,320 -42.87 128 -43.61 0.0000
2015-11-09 2015-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,424 128
2015-08-12 2015-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,744 -158,975 -95.36 227 -95.45 0.0001
2015-05-14 2015-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 166,719 154,724 1,289.90 4,991 1,708.33 0.0018
2015-02-13 2014-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 11,995 9,495 379.80 276 430.77 0.0001
2014-12-16 2014-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 2,500 2,500 -79.16 52 -81.16 0.0000
2014-11-14 2014-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,500 52
2014-02-13 2013-12-31 13F WMS INDUSTRIES INC COM ST COM 929297109 0 -2,255,402 -100.00 0 -100.00
2013-11-13 2013-09-30 13F WMS INDUSTRIES INC COM ST COM 929297109 2,255,402 110,044 5.13 58,528 6.94 0.0277
2013-08-08 2013-06-30 13F WMS INDUSTRIES INC COM ST COM 929297109 2,145,358 2,145,358 54,728 0.0276
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.