Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionSwedbank AB
Latest Disclosed Ownership164,961 shares
Latest Disclosed Value $ 22,621,102
Swedbank AB reports 21.75% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On April 29, 2026 - Swedbank AB filed a 13F-HR form disclosing ownership of 164,961 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $22,621,102 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 9, 2026 disclosing 210,800 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -21.75% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-29 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 164,961 -45,839 -21.75 22,621 -25.91 0.0134
2026-02-09 2025-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 210,800 -150,430 -41.64 30,530 -39.06 0.0166
2026-02-03 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 210,800 -150,430 30,530 0.0166
2025-10-15 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 361,230 -94,469 -20.73 50,103 -4.28 0.0508
2025-07-10 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 455,699 -428,090 -48.44 52,342 -45.49 0.0588
2025-04-14 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 883,789 -496,111 -35.95 96,024 -39.80 0.1278
2025-01-22 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,379,900 -4,376 -0.32 159,516 -26.68 0.1961
2024-10-11 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,384,276 75,455 5.77 217,553 3.64 0.2778
2024-07-11 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,308,821 26,581 2.07 209,922 95,318.64 0.2806
2024-05-13 2024-03-31 13F ADVANCED DRAINAG COM 00790R104 1,282,240 -57,041 -4.26 221 -99.88 0.3719
2024-12-06 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,339,281 21,277 1.61 188,356 25.55 0.3033
2024-12-06 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,318,004 -262,119 -16.59 150,028 -16.55 0.2599
2024-12-06 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,580,123 -105,900 -6.28 179,786 26.63 0.3048
2024-12-06 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,686,023 394,500 30.55 141,980 34.11 0.2800
2024-12-06 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,291,523 755,177 140.80 105,866 58.71 0.2328
2024-12-06 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 536,346 12,857 2.46 66,705 41.47 0.1583
2024-12-06 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 523,489 167,143 46.90 47,151 11.37 0.1064
2024-12-06 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 356,346 -30,178 -7.81 42,337 -18.56 0.0785
2024-12-06 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 386,524 -18,815 -4.64 51,987 18.57 0.0869
2024-12-06 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 405,339 76,086 23.11 43,846 14.24 0.0819
2024-12-06 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 329,253 -13,521 -3.94 38,381 8.30 0.0720
2024-12-06 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 342,774 342,774 35,439 0.0736
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.