Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionVanguard Group Inc
Latest Disclosed Ownership0 shares
Ownership 0.00%
Vanguard Group Inc ownership in WMS / Advanced Drainage Systems, Inc.

2026-03-26 - Vanguard Group Inc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 0 shares of Advanced Drainage Systems, Inc. (MX:WMS). This represents 0.0 percent ownership of the company. In their previous filing dated 2024-02-13 , Vanguard Group Inc had reported owning 6,870,070 shares, indicating a decrease of -100.00 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-03-26 2026-03-26 13G/A 6,870,070 0 -100.00 0.00 -100.00
2024-02-13 2024-02-13 13G/A 6,666,198 6,870,070 3.06 8.82 9.57
2023-02-09 2023-02-09 13G/A 4,761,043 6,666,198 40.02 8.05 20.51
2022-02-09 2022-02-09 13G/A 4,243,602 4,761,043 12.19 6.68 10.96
2021-02-10 2021-02-10 13G/A 4,120,823 4,243,602 2.98 6.02 -0.17
2020-02-12 2020-02-12 13G/A 3,629,159 4,120,823 13.55 6.03 -5.04
2019-02-11 2019-02-11 13G/A 2,897,478 3,629,159 25.25 6.35 22.59
2018-02-12 2018-02-12 13G 2,897,478 5.18
2013-02-13 2013-02-13 13G 2,864,828 5.24

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 7,410,388 -70,393 -0.94 1,073,246 3.44 0.0156
2025-11-07 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,480,781 -28,194 -0.38 1,037,584 20.30 0.0155
2025-08-11 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,508,975 -28,119 -0.37 862,481 5.32 0.0140
2025-05-09 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,537,094 204,826 2.79 818,905 -3.39 0.0148
2025-02-11 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,332,268 52,799 0.73 847,610 -25.91 0.0148
2024-11-13 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,279,469 -6,923 -0.10 1,144,041 -2.11 0.0205
2024-08-13 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,286,392 21,223 0.29 1,168,664 -6.61 0.0225
2024-05-10 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 7,265,169 395,099 5.75 1,251,353 29.51 0.0248
2024-03-11 2023-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 6,870,070 -8,656 -0.13 966,207 23.40 0.0211
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,870,070 -8,656 966,207 0.0183
2023-12-18 2023-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 6,878,726 65,038 0.95 783,005 1.00 0.0192
2023-11-14 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,878,726 65,038 783,005 0.0035
2023-08-14 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,813,688 39,797 0.59 775,261 35.91 0.0184
2023-07-14 2023-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 6,773,891 107,693 1.62 570,429 4.39 0.0145
2023-05-15 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,773,891 107,693 570,429 0.0145
2023-02-10 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,666,198 278,893 4.37 546,428 -31.21 0.0149
2022-11-14 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,387,305 278,780 4.56 794,389 44.38 0.0234
2022-08-12 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 6,108,525 821,307 15.53 550,195 -12.41 0.0155
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 5,287,218 526,175 11.05 628,174 -3.08 0.0149
2022-02-14 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,761,043 300,194 6.73 648,121 34.32 0.0147
2021-11-12 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,460,849 -252,395 -5.36 482,529 -12.18 0.0120
2021-08-13 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,713,244 86,203 1.86 549,422 14.85 0.0137
2021-05-14 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,627,041 383,439 9.04 478,389 34.88 0.0129
2021-02-12 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,243,602 146,635 3.58 354,680 38.65 0.0103
2020-11-16 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,096,967 -430,652 -9.51 255,815 14.37 0.0085
2020-08-14 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,527,619 269,088 6.32 223,665 78.40 0.0079
2020-05-15 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,258,531 137,708 3.34 125,370 -21.67 0.0053
2020-02-14 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,120,823 -394,007 -8.73 160,053 9.86 0.0055
2019-11-14 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 4,514,830 780,994 20.92 145,694 19.00 0.0054
2019-08-14 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,733,836 28,682 0.77 122,432 28.22 0.0046
2019-05-15 2019-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,705,154 75,995 2.09 95,483 8.50 0.0037
2019-02-14 2018-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,629,159 135,334 3.87 88,006 -18.48 0.0040
2018-12-13 2018-09-30 13F/A-2 ADVANCED DRAIN SYS INC DEL COM 00790R104 3,493,825 206,839 6.29 107,959 15.04 0.0042
2018-11-23 2018-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 3,493,825 0 107,959 0.0042
2018-11-14 2018-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,493,825 206,839 107,959
2018-08-14 2018-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,286,986 374,885 12.87 93,844 24.42 0.0039
2018-05-15 2018-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,912,101 14,623 0.50 75,424 9.14 0.0033
2018-02-14 2017-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,897,478 140,733 5.11 69,106 23.79 0.0030
2017-11-14 2017-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,756,745 -289,931 -9.52 55,825 -8.84 0.0026
2017-08-24 2017-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 3,046,676 95,375 3.23 61,238 -5.25 0.0030
2017-08-11 2017-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,046,676 95,375 61,238
2017-05-12 2017-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,951,301 273,698 10.22 64,632 17.17 0.0033
2017-02-14 2016-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,677,603 110,410 4.30 55,159 -10.70 0.0031
2016-11-14 2016-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,567,193 52,973 2.11 61,766 -10.24 0.0036
2016-08-10 2016-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,514,220 120,802 5.05 68,815 34.98 0.0043
2016-05-13 2016-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,393,418 78,065 3.37 50,980 -8.37 0.0033
2016-02-08 2015-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,315,353 2,309,653 40,520.23 55,638 33,620.00 0.0037
2015-11-12 2015-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 5,700 -1,989,850 -99.71 165 -99.72 0.0000
2015-11-12 2015-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 4,303,844 2,308,294 124,511 0.0053
2015-11-12 2015-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 11,498,077 436,988
2015-08-13 2015-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,995,550 268,904 15.57 58,530 13.22 0.0040
2015-05-15 2015-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 1,726,646 366,325 26.93 51,696 65.37 0.0035
2015-05-14 2015-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,726,646 51,696
2015-02-12 2014-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,360,321 858,122 170.87 31,260 197.12 0.0023
2014-11-12 2014-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 502,199 502,199 -82.20 10,521 -85.63 0.0008
2014-02-12 2013-12-31 13F WMS INDS COM 929297109 0 -2,821,594 -100.00 0 -100.00
2013-11-07 2013-09-30 13F WMS INDS COM 929297109 2,821,594 50,367 1.82 73,220 3.57 0.0072
2013-08-13 2013-06-30 13F WMS INDS COM 929297109 2,771,227 2,771,227 70,694 0.0074
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.