🕵️ Advanced Drainage Systems, Inc. ($WMS)
SEC insider & ownership activity, last 12 months · CIK 1604028 · every row links its SEC filing
Over the last 12 months insiders sold $14.8M with no open-market buying against it. Barbour D. Scott sold $11.9M in discretionary trades (Nov). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 4 sellers, $14.8M (9 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Barbour D. Scott | 0 | – | 3 | $11.9M | Nov 12, 2025 |
| Robert M. Eversole | 0 | – | 1 | $1.6M | Dec 3, 2025 |
| Tim A. Makowski | 0 | – | 2 | $731K | Nov 12, 2025 |
| Thomas J. Waun Sr. | 0 | – | 3 | $571K | Nov 26, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Blackrock, Inc. | 8.9% | 13G | Jul 17, 2025 | filing ↗ | |
| Advanced Drainage Systems Inc. Employee Stock Ownership PLAN Trust | 6.0% | 13G | Feb 13, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.1% | 13G | Apr 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Robert M. Eversole | $1.6M | Dec 2, 2025 | filing ↗ |
| Thomas Waun | $232K | Nov 26, 2025 | filing ↗ |
| Donald Scott Barbour | $11.9M | Nov 12, 2025 | filing ↗ |
| Thomas Waun | $150K | Nov 12, 2025 | filing ↗ |
| Tim Makowski | $731K | Nov 12, 2025 | filing ↗ |
| Darin Harvey | $431K | Nov 10, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | Jul 16, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 16, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 18, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 18, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 21, 2026 | filing ↗ |
| Earnings (2.02) | May 21, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 21, 2026 | filing ↗ |
| Other events (8.01) | May 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 21, 2026 | filing ↗ |
| Material agreement (1.01) | Feb 27, 2026 | filing ↗ |
| New financial obligation (2.03) | Feb 27, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 27, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 27, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 12, 2026 | filing ↗ |
| Earnings (2.02) | Feb 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 5, 2026 | filing ↗ |
| Other events (8.01) | Feb 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 5, 2026 | filing ↗ |
| Acquisition or disposition (2.01) | Feb 2, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 2, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 2, 2026 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 6, 2025 | filing ↗ |
| Other events (8.01) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Material agreement (1.01) | Sep 23, 2025 | filing ↗ |