Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionCandriam Luxembourg S.C.A.
Latest Disclosed Ownership81,455 shares
Latest Disclosed Value $ 11,169,924
Candriam Luxembourg S.C.A. reports 13.31% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On April 30, 2026 - Candriam Luxembourg S.C.A. filed a 13F-HR form disclosing ownership of 81,455 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $11,169,924 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on April 30, 2026 disclosing 93,956 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -13.31% 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)
2026-04-30 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 81,455 -12,501 -13.31 11,170 -17.92 0.0580
2026-04-30 2025-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 93,956 -26,223 -21.82 13,608 -18.36 0.0679
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 93,956 -26,223 13,608
2025-11-06 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 120,179 25,909 27.48 16,669 53.93 0.0873
2025-08-08 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 94,270 56 0.06 10,828 5.78 0.0624
2025-05-14 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 94,214 7,913 9.17 10,236 2.61 0.0641
2025-02-07 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 86,301 -55,319 -39.06 9,976 -55.18 0.0575
2024-11-13 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 141,620 -37,856 -21.09 22,256 -22.68 0.1279
2024-08-05 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 179,476 17,055 10.50 28,785 2.89 0.1745
2024-05-06 2024-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 162,421 -8,045 -4.72 27,975 16.68 0.1789
2024-02-14 2023-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 170,466 -134,216 -44.05 23,975 -30.87 0.1655
2023-11-13 2023-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 304,682 -83,338 -21.48 34,682 -21.44 0.2458
2023-08-08 2023-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 388,020 -44,365 -10.26 44,149 31.73 0.3191
2023-05-12 2023-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 432,385 14,123 3.38 33,514 -2.24 0.2325
2023-02-13 2022-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 418,262 107,488 34.59 34,283 -11.31 0.2313
2022-11-10 2022-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 310,774 4,241 1.38 38,653 40.01 0.2723
2022-08-03 2022-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 306,533 -50,794 -14.21 27,608 -34.97 0.2273
2022-05-13 2022-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 357,327 -65,851 -15.56 42,452 -26.31 0.2889
2022-02-10 2021-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 423,178 19,056 4.72 57,607 31.79 0.3677
2021-11-09 2021-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 404,122 40,234 11.06 43,712 3.05 0.2972
2021-07-20 2021-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 363,888 30,503 9.15 42,418 58.47 0.2903
2021-04-29 2021-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 333,385 -10 -0.00 26,767 -3.95 0.2228
2021-01-22 2020-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 333,395 51,046 18.08 27,867 58.07 0.2205
2020-10-19 2020-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 282,349 35,334 14.30 17,629 44.46 0.1656
2020-07-23 2020-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 247,015 117,262 90.37 12,203 147.73 0.1288
2020-05-26 2020-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 129,753 48 0.04 4,926 -2.22 0.0546
2020-02-05 2019-12-31 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 129,705 94,135 264.65 5,038 338.85 0.0540
2020-01-21 2019-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 129,705 94,135 5 53,625.0536
2020-02-05 2019-09-30 13F/A-1 ADVANCED DRAIN SYS INC DEL COM 00790R104 35,570 8,918 33.46 1,148 31.95 0.0152
2019-10-21 2019-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 35,570 8,918 1 12,567.5506
2019-08-01 2019-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 26,652 26,652 870 0.0109
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.