Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionVontobel Holding Ltd.
Latest Disclosed Ownership38,949 shares
Latest Disclosed Value $ 5,341,076
Vontobel Holding Ltd. reports 71.93% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 8, 2026 - Vontobel Holding Ltd. filed a 13F-HR form disclosing ownership of 38,949 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $5,341,076 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 22,654 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 71.93% 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)
2026-05-08 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 38,949 16,295 71.93 5,341 62.84 0.0184
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 22,654 772 3.53 3,281 8.07 0.0103
2025-10-15 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,882 186 0.86 3,035 21.79 0.0092
2025-07-23 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,696 -5,716 -20.85 2,492 -16.32 0.0079
2025-04-28 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 27,412 24 0.09 2,978 -5.94 0.0109
2025-01-30 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 27,388 5,909 27.51 3,166 -6.19 0.0108
2024-10-16 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 21,479 565 2.70 3,376 0.63 0.0109
2024-08-13 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 20,914 -3,236 -13.40 3,354 -19.36 0.0109
2024-05-10 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 24,150 -441 -1.79 4,160 20.27 0.0333
2024-06-04 2023-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 24,591 -4,423 -15.24 3,458 4.72 0.0290
2024-01-30 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 35,755 -4,423 5,029 0.0253
2024-06-04 2023-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 29,014 -3,835 -11.67 3,303 -11.64 0.0305
2023-10-11 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 40,178 -9,335 4,573 0.0255
2024-06-04 2023-06-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 32,849 -6,863 -17.28 3,738 11.75 0.0328
2023-07-24 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 49,513 9,801 5,634 0.0299
2024-06-04 2023-03-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 39,712 5,189 15.03 3,344 20.11 0.0311
2023-04-12 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 56,676 22,153 4,773 0.0271
2023-02-14 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 34,523 10,745 45.19 2,784 -5.88 0.0281
2022-11-04 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 23,778 -5,985 -20.11 2,958 10.04 0.0345
2022-07-27 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 29,763 6,164 26.12 2,688 -8.23 0.0291
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 23,599 105 0.45 2,929 -7.31 0.0253
2022-02-14 2021-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 23,494 -7,227 -23.52 3,160 -4.91 0.0263
2022-02-10 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 30,721 0 3,323 0.0126
2021-10-29 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 30,721 5,239 20.56 3,323 11.74 0.0293
2021-08-06 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 25,482 1,200 4.94 2,974 18.44 0.0257
2021-05-11 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 24,282 -4,146 -14.58 2,511 -10.77 0.0186
2021-02-12 2020-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 28,428 28,428 2,814 0.0184
2021-02-12 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 28,428 2,814 0.0184
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.