Advanced Drainage Systems, Inc. (WMS) ownership: Top institutional holder: VANGUARD GROUP INC ($1.07B). Insider activity: Net Seller (0 buys, 20 sells). 5 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 7410388.00 | $1.07B | 2025-12-31 |
| BlackRock, Inc. | 7422729.00 | $1.02B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3615687.00 | $495.82M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3423703.00 | $469.49M | 2026-03-31 |
| STATE STREET CORP | 2489531.00 | $341.39M | 2026-03-31 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 2450123.00 | $335.99M | 2026-03-31 |
| Pictet Asset Management Holding SA | 2204801.00 | $302.29M | 2026-03-31 |
| BAILLIE GIFFORD & CO | 2047349.00 | $280.75M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-05-26 | |
| Sell | null | 2026-05-26 | |
| Sell | null | 2026-05-26 | |
| Sell | null | 2026-05-26 | |
| Sell | null | 2026-05-26 | |
| Sell | null | 2026-05-26 |
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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.