Advanced Drainage Systems, Inc.
US ˙ NYSE ˙ US00790R1041

SecurityWMS / Advanced Drainage Systems, Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership32,956 shares
Latest Disclosed Value $ 4,519
Amalgamated Bank reports 1.24% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 32,956 shares of Advanced Drainage Systems, Inc. (US:WMS) valued at $4,519,256 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 32,553 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 1.24% during the quarter. The current value of the position is $4,367,000 USD.

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 32,956 403 1.24 5 0.00 0.0346
2026-02-05 2025-12-31 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 32,553 -61 -0.19 5 0.00 0.0340
2025-10-29 2025-09-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 32,614 381 1.18 5 33.33 0.0323
2025-08-04 2025-06-30 13F ADVANCED DRAIN SYS INC DEL COM 00790R104 32,233 -477 -1.46 4 0.00 0.0286
2025-04-25 2025-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 32,710 -1,284 -3.78 4 0.00 0.0304
2025-02-04 2024-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 33,994 40 0.12 4 -40.00 0.0323
2024-10-30 2024-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 33,954 -717 -2.07 5 0.00 0.0440
2024-08-12 2024-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 34,671 -7,323 -17.44 6 -28.57 0.0474
2024-04-23 2024-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 41,994 -10,124 -19.43 7 0.00 0.0619
2024-02-06 2023-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 52,118 -844 -1.59 7 16.67 0.0585
2023-11-08 2023-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 52,962 8,022 17.85 6 20.00 0.0513
2023-08-11 2023-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 44,940 -1,204 -2.61 5 66.67 0.0414
2023-05-02 2023-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 46,144 31,426 213.52 4 200.00 0.0331
2023-02-10 2022-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 14,718 148 1.02 1 -99.94 0.0108
2022-11-09 2022-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 14,570 -708 -4.63 1,812 31.69 0.0175
2022-08-15 2022-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 15,278 1,191 8.45 1,376 -17.80 0.0128
2022-08-25 2022-03-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS COM 00790R104 14,087 1,312 10.27 1,674 -3.74 0.0130
2022-06-30 2022-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 14,087 1,312 1,674 0.0133
2022-02-15 2021-12-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS COM 00790R104 12,775 -3,962 -23.67 1,739 -3.92 0.0128
2022-02-15 2021-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 12,775 -3,962 1,739 0.0128
2021-10-29 2021-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 16,737 134 0.81 1,810 -6.46 0.0153
2021-08-16 2021-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 16,603 8,584 107.05 1,935 133.41 0.0155
2021-05-13 2021-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 8,019 -784 -8.91 829 12.64 0.0311
2021-02-12 2020-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 8,803 162 1.87 736 36.30 0.0279
2020-10-30 2020-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 8,641 729 9.21 540 38.11 0.0235
2020-08-10 2020-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 7,912 107 1.37 391 70.00 0.0181
2020-05-13 2020-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 7,805 -335 -4.12 230 -27.22 0.0056
2020-02-13 2019-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 8,140 1,655 25.52 316 51.20 0.0058
2019-11-13 2019-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 6,485 -48 -0.73 209 -2.34 0.0044
2019-08-14 2019-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 6,533 6,533 214 0.0050
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.