Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership15,224 shares
Latest Disclosed Value $ 2,087,667
Bnp Paribas Arbitrage, Sa reports 14.01% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 15,224 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $2,087,667 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 17,704 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -14.01% 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)
2026-05-12 2026-03-31 13F Advanced Drainage Systems Equity 00790R104 15,224 -2,480 -14.01 2,088 -18.60 0.0001
2026-02-10 2025-12-31 13F Advanced Drainage Systems Equity 00790R104 17,704 -113,829 -86.54 2,564 -85.95 0.0012
2025-11-13 2025-09-30 13F Advanced Drainage Systems Equity 00790R104 131,533 72,733 123.70 18,244 170.15 0.0097
2025-08-14 2025-06-30 13F Advanced Drainage Systems Equity 00790R104 58,800 12,592 27.25 6,754 34.52 0.0039
2025-05-14 2025-03-31 13F Advanced Drainage Systems Equity 00790R104 46,208 5,678 14.01 5,020 7.15 0.0030
2025-02-14 2024-12-31 13F Advanced Drainage Systems Equity 00790R104 40,530 -6,484 -13.79 4,685 -36.59 0.0026
2024-11-13 2024-09-30 13F Advanced Drainage Systems Equity 00790R104 47,014 -26,814 -36.32 7,389 -37.61 0.0050
2024-08-13 2024-06-30 13F Advanced Drainage Systems Equity 00790R104 73,828 -1,023 -1.37 11,841 -8.15 0.0096
2024-05-01 2024-03-31 13F Advanced Drainage Systems Equity 00790R104 74,851 29,025 63.34 12,892 100.06 0.0113
2024-02-14 2023-12-31 13F/A-2 Advanced Drainage Systems Equity 00790R104 45,826 -25,243 -35.52 6,445 -20.34 0.0073
2024-02-07 2023-12-31 13F/A-1 Advanced Drainage Systems Equity 00790R104 45,826 -25,243 6,445 0.0009
2024-02-07 2023-12-31 13F Advanced Drainage Systems Equity 00790R104 45,826 6,445
2023-11-14 2023-09-30 13F Advanced Drainage Systems Equity 00790R104 71,069 -4,427 -5.86 8,090 -5.82 0.0104
2023-08-09 2023-06-30 13F Advanced Drainage Systems Equity 00790R104 75,496 -24,336 -24.38 8,590 2.18 0.0107
2023-05-12 2023-03-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 99,832 641 0.65 8,407 3.39 0.0118
2023-02-14 2022-12-31 13F Advanced Drainage Systems Equity 00790R104 99,191 6,204 6.67 8,131 -29.70 0.0125
2022-11-16 2022-09-30 13F/A-1 Advanced Drainage Systems Equity 00790R104 92,987 70,433 312.29 11,565 469.37 0.0185
2022-11-15 2022-09-30 13F Advanced Drainage Systems Equity 00790R104 92,987 70,433 11,565 0.0028
2022-08-12 2022-06-30 13F Advanced Drainage Systems Equity 00790R104 22,554 7,368 48.52 2,031 12.58 0.0032
2022-05-18 2022-03-31 13F/A-1 Advanced Drainage Systems Equity 00790R104 15,186 9,373 161.24 1,804 128.07 0.0024
2022-02-09 2021-12-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 5,813 -25,120 -81.21 791 -76.36 0.0011
2021-11-16 2021-09-30 13F/A-1 ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 30,933 22,773 279.08 3,346 251.84 0.0047
2021-11-12 2021-09-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 15,915 7,755 994 0.0000
2021-08-10 2021-06-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 8,160 -13,636 -62.56 951 -57.79 0.0013
2021-05-07 2021-03-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 21,796 8,369 62.33 2,253 100.80 0.0033
2021-02-10 2020-12-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 13,427 -2,488 -15.63 1,122 12.99 0.0021
2020-10-30 2020-09-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 15,915 9,602 152.10 994 219.29 0.0014
2020-08-06 2020-06-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 6,313 -9,219 -59.35 312 -31.95 0.0006
2020-05-13 2020-03-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 15,532 -130,867 -89.39 457 -91.96 0.0009
2020-02-12 2019-12-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 146,399 138,211 1,687.97 5,686 2,053.79 0.0104
2019-11-07 2019-09-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 8,188 1,554 23.42 264 21.66 0.0005
2019-07-30 2019-06-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 6,634 -3,126 -32.03 218 -13.55 0.0004
2019-04-25 2019-03-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 9,760 8,264 552.41 252 597.22 0.0005
2019-02-12 2018-12-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 1,496 -2,078 -58.14 36 -67.27 0.0001
2018-11-07 2018-09-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 3,574 602 20.26 110 30.95 0.0002
2018-07-25 2018-06-30 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 2,972 -6,044 -67.04 85 -63.95 0.0001
2018-05-11 2018-03-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 9,016 -218 -2.36 234 5.91 0.0004
2018-03-05 2017-12-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 9,234 4,584 98.58 220 134.04 0.0004
2018-02-01 2017-12-31 13F ADVANCED DRAINAGE SYSTEMS EQUITY 00790R104 9,234 4,584 220
2017-11-03 2017-09-30 13F ADVANCED DRAIN SYS INC DEL STOCK 00790R104 4,650 -609 -11.58 94 -10.48 0.0002
2017-08-03 2017-06-30 13F ADVANCED DRAIN SYS INC DEL STOCK 00790R104 5,259 3,006 133.42 106 114.29 0.0003
2017-05-03 2017-03-31 13F ADVANCED DRAIN SYS INC DEL STOCK 00790R104 2,253 -1,577 -41.17 49 -37.18 0.0001
2017-02-14 2016-12-31 13F ADVANCED DRAIN SYS INC DEL STOCK 00790R104 3,830 894 30.45 79 11.43 0.0004
2016-10-05 2016-09-30 13F * ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 2,936 1,564 113.99 71 89.19 0.0003
2016-07-06 2016-06-30 13F * ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 1,372 1,372 38 0.0002
2016-04-22 2016-03-31 13F * ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 0 -3,228 -100.00 0 -100.00
2016-04-19 2015-12-31 13F/A-1 * ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 3,228 -6,165 -65.63 78 -71.59 0.0004
2016-02-10 2015-12-31 13F * ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 3,228 78
2015-11-13 2015-09-30 13F ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 9,393 6,417 215.62 272 211.49 0.0007
2015-08-14 2015-06-30 13F ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 2,976 2,614 722.10 87 770.00 0.0002
2015-05-15 2015-03-31 13F ADVANCED DRAIN SYS INC DEL COM STOCK 00790R104 362 -23,642 -98.49 11 -98.39 0.0000
2013-11-13 2013-09-30 13F WMS INDS STOCK 929297109 24,004 -11,394 -32.19 623 -31.12 0.0005
2013-08-13 2013-06-30 13F WMS INDS STOCK 929297109 35,398 35,398 903 0.0006
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.