Advanced Drainage Systems, Inc.
MX ˙ BMV ˙ US00790R1041
SecurityMX:WMS / Advanced Drainage Systems, Inc.
InstitutionUbs Asset Management Americas Inc
Latest Disclosed Ownership2,450,123 shares
Latest Disclosed Value $ 335,985,368
Ubs Asset Management Americas Inc reports 4.12% decrease in ownership of WMS / Advanced Drainage Systems, Inc.

On May 13, 2026 - Ubs Asset Management Americas Inc filed a 13F-HR form disclosing ownership of 2,450,123 shares of Advanced Drainage Systems, Inc. (MX:WMS) valued at $335,985,368 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,555,361 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of -4.12% 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)
2026-05-13 2026-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,450,123 -105,238 -4.12 335,985 -9.22 0.0105
2026-02-13 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,555,361 -256,473 -9.12 370,093 -5.10 0.0782
2025-11-14 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,811,834 -300,820 -9.66 390,001 9.09 0.0847
2025-08-14 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,112,654 -1,570 -0.05 357,519 5.66 0.0724
2025-05-19 2025-03-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 3,114,224 1,049,697 50.84 338,360 41.78 0.0866
2025-02-14 2024-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 2,064,527 799,569 63.21 238,659 20.05 0.0557
2024-11-14 2024-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,264,958 -7,852 -0.62 198,801 -2.62 0.0511
2024-08-14 2024-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 1,272,810 4,373 0.34 204,146 -6.56 0.0586
2024-05-15 2024-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 1,268,437 -2,899 -0.23 218,476 22.19 0.0777
2024-02-14 2023-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 1,271,336 25,504 2.05 178,801 26.08 0.0703
2023-11-13 2023-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 1,245,832 80,619 6.92 141,813 44.53 0.0635
2023-08-11 2023-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 1,165,213 0 0.00 98,123 0.00 0.0475
2023-05-15 2023-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 1,165,213 122,166 11.71 98,123 14.77 0.0475
2023-02-14 2022-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 1,043,047 221,043 26.89 85,499 -16.37 0.0448
2022-11-14 2022-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 822,004 -38,728 -4.50 102,233 31.87 0.0574
2022-08-12 2022-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 860,732 11,240 1.32 77,526 -23.19 0.0406
2022-05-16 2022-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 849,492 -709 -0.08 100,928 -12.80 0.0432
2022-02-14 2021-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 850,201 -17,255 -1.99 115,738 23.34 0.0443
2021-11-15 2021-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 867,456 1,290 0.15 93,833 -7.07 0.0389
2021-08-16 2021-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 866,166 38,771 4.69 100,969 18.03 0.0432
2021-05-14 2021-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 827,395 120,325 17.02 85,544 44.75 0.0378
2021-03-01 2020-12-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 707,070 662,360 1,481.46 59,097 2,017.38 0.0277
2021-02-17 2020-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 44,710 0 2,792 0.2633
2020-11-13 2020-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 44,710 -1,422 -3.08 2,792 22.52 0.0015
2020-08-14 2020-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 46,132 -6,203 -11.85 2,279 47.92 0.0014
2020-05-15 2020-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 52,335 -757 -1.43 1,541 -25.32 0.0011
2020-02-14 2019-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 53,092 -81 -0.15 2,062 20.23 0.0013
2019-11-14 2019-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 53,173 6,437 13.77 1,716 11.95 0.0012
2019-08-15 2019-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 46,736 8,873 23.43 1,532 57.13 0.0011
2019-05-14 2019-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 37,863 7,850 26.16 976 34.11 0.0007
2019-02-13 2018-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 30,013 3,264 12.20 728 -11.99 0.0006
2018-11-13 2018-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 26,749 0 0.00 827 8.26 0.0006
2018-08-14 2018-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 26,749 0 0.00 764 10.26 0.0006
2018-05-14 2018-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 26,749 17,501 189.24 693 214.55 0.0005
2018-02-09 2017-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 9,248 9,248 221 0.0002
2017-03-09 2016-12-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 0 -18,700 -100.00 0 -100.00
2016-11-04 2016-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 18,700 0 0.00 450 -12.11 0.0005
2016-11-29 2016-06-30 13F/A-1 ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 18,700 2,300 14.02 512 46.70 0.0006
2016-08-09 2016-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 18,700 512
2016-05-12 2016-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 16,400 -1,100 -6.29 349 -17.10 0.0004
2016-02-12 2015-12-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 17,500 0 0.00 421 -16.80 0.0005
2015-10-29 2015-09-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 17,500 0 0.00 506 -1.36 0.0006
2015-08-12 2015-06-30 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 17,500 6,100 53.51 513 50.44 0.0005
2015-05-04 2015-03-31 13F ADVANCED DRAINAGE SYSTEMS IN EQUITY US CM 00790R104 11,400 11,400 -43.28 341 -34.67 0.0003
2014-01-31 2013-12-31 13F WMS INDUSTRIES EQUITY US CM 929297109 0 -20,098 -100.00 0 -100.00
2013-11-08 2013-09-30 13F WMS INDUSTRIES EQUITY US CM 929297109 20,098 0 0.00 522 1.75 0.0006
2013-08-15 2013-06-30 13F/A-1 WMS INDUSTRIES EQUITY US CM 929297109 20,098 20,098 513 0.0007
2013-08-13 2013-06-30 13F WMS INDUSTRIES EQUITY US CM 929297109 20,098 513 0.0007
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.