Advanced Drainage Systems, Inc.
US ˙ NYSE ˙ US00790R1041

SecurityWMS / Advanced Drainage Systems, Inc.
InstitutionStrs Ohio
Latest Disclosed Ownership44,790 shares
Latest Disclosed Value $ 6,142,053
Strs Ohio reports 229.53% increase in ownership of WMS / Advanced Drainage Systems, Inc.

On April 24, 2026 - Strs Ohio filed a 13F-HR form disclosing ownership of 44,790 shares of Advanced Drainage Systems, Inc. (US:WMS) valued at $6,142,053 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 13,592 shares of Advanced Drainage Systems, Inc.. This represents a change in shares of 229.53% during the quarter. The current value of the position is $5,935,123 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)
2026-04-24 2026-03-31 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 44,790 31,198 229.53 6,142 212.09 0.0244
2026-02-02 2025-12-31 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 13,592 11,903 704.74 1,969 741.03 0.0073
2025-10-30 2025-09-30 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 1,689 0 0.00 234 21.24 0.0009
2025-08-04 2025-06-30 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 1,689 1,689 194 0.0007
2025-05-28 2024-12-31 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 0 -7,024 -100.00 0 -100.00
2024-11-01 2024-09-30 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 7,024 1,100 18.57 1,104 16.11 0.0042
2024-08-05 2024-06-30 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 5,924 -87 -1.45 950 94,900.00 0.0038
2024-05-13 2024-03-31 13F ADVANCED DRAINAGE SYSTEMS IN COM_STK 00790R104 6,011 -1,191 -16.54 1 0.00 0.0041
2024-01-30 2023-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 7,202 7,202 1 0.0042
2023-01-26 2022-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 0 -6,128 -100.00 0 -100.00
2022-10-27 2022-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 6,128 6,128 762 0.0036
2022-04-21 2022-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 0 -9,163 -100.00 0 -100.00
2022-01-24 2021-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 9,163 -4,685 -33.83 1,247 -16.70 0.0043
2021-10-22 2021-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 13,848 -38 -0.27 1,497 -7.48 0.0056
2021-07-26 2021-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 13,886 -2,414 -14.81 1,618 -3.98 0.0058
2021-04-23 2021-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 16,300 5,300 48.18 1,685 83.35 0.0063
2021-01-25 2020-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 11,000 5,200 89.66 919 153.87 0.0035
2020-12-14 2020-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 5,800 2,200 61.11 362 104.52 0.0015
2020-07-23 2020-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 3,600 2,200 157.14 177 331.71 0.0008
2020-04-23 2020-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 1,400 0 0.00 41 -24.07 0.0002
2020-01-24 2019-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 1,400 -24,300 -94.55 54 -93.49 0.0002
2019-10-21 2019-09-30 13F/A-1 ADVANCED DRAINAGE SYSTEMS COM 00790R104 25,700 25,700 829 0.0036
2019-10-21 2019-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 25,700 24,300 829 3,669.2000
2015-08-04 2015-06-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 0 -26,100 -100.00 0 -100.00
2015-04-27 2015-03-31 13F/A-1 ADVANCED DRAINAGE SYSTEMS COM 00790R104 26,100 -6,500 -19.94 781 4.27 0.0034
2015-04-21 2015-03-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 26,100 781
2015-01-23 2014-12-31 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 32,600 27,400 526.92 749 587.16 0.0032
2014-10-29 2014-09-30 13F/A-1 ADVANCED DRAINAGE SYSTEMS COM 00790R104 5,200 4,500 642.86 109 505.56 0.0005
2014-10-20 2014-09-30 13F ADVANCED DRAINAGE SYSTEMS COM 00790R104 5,200 109
2013-10-24 2013-09-30 13F WMS INDUSTRIES COM 929297109 700 0 0.00 18 0.00 0.0001
2013-08-12 2013-06-30 13F WMS INDUSTRIES COM 929297109 700 700 18 0.0001
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.