Advanced Drainage Systems, Inc. (WMS) ownership: KSOP 8% · institutions 92% (13F 2026-03-31). Insider activity, 90 days: 0 sales, 0 open-market buys. 6 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| Vanguard | 7613306.00 | $1.04B | 9.9% | 2026-03-31 |
| BlackRock | 7422729.00 | $1.02B | 9.7% | 2026-03-31 |
| UBS | 2668180.00 | $365.89M | 3.5% | 2026-03-31 |
| State Street | 2489531.00 | $341.39M | 3.3% | 2026-03-31 |
| Pictet Asset Management Holding SA | 2204801.00 | $302.29M | 2.9% | 2026-03-31 |
| Baillie Gifford | 2047349.00 | $280.75M | 2.7% | 2026-03-31 |
| First Trust Advisors LP | 2044057.00 | $280.30M | 2.7% | 2026-03-31 |
| Impax Asset Management Group plc | 1927510.00 | $264.32M | 2.5% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-20 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.