Advanced Drainage Systems Inc (WMS)
Who owns Advanced Drainage Systems Inc (WMS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 92.8% of the shares are freely tradable; institutional investors hold 96.9%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.68 | 7,422,729 | +4.4 | 03/31/2026 |
| Vanguard Group Inc | 9.67 | 7,410,388 | -0.9 | 12/31/2025 |
| Vanguard Portfolio Management, LLC | 4.72 | 3,615,687 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.47 | 3,423,703 | +0.0 | 03/31/2026 |
| State Street Corp | 3.25 | 2,489,531 | +0.8 | 03/31/2026 |
| UBS Asset Mgmt Americas Inc | 3.20 | 2,450,123 | -4.1 | 03/31/2026 |
| Pictet Asset Manangement SA | 2.88 | 2,204,801 | +32.9 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| UBS: Global Equity | 5.97 | 4,572,430 | +0.0 | 12/31/2025 |
| Vanguard Total Stock Mkt Idx Inv | 3.24 | 2,484,138 | +0.2 | 04/30/2026 |
| iShares Core S&P Mid-Cap ETF | 3.17 | 2,431,136 | +0.0 | 05/29/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 16. Jul 2026 | Fratto Tanya D | Director | Other | 1,110 | 0.00 | – |
| 16. Jul 2026 | Gast Kelly S. | Director | Other | 1,110 | 0.00 | – |
| 16. Jul 2026 | Coleman Michael B. | Director | Other | 1,110 | 0.00 | – |
| 16. Jul 2026 | Seetharam Anil | Director | Other | 1,782 | 0.00 | – |
| 16. Jul 2026 | Chaibi Anesa | Director | Other | 1,110 | 0.00 | – |
| 16. Jul 2026 | Perez De La Mesa Manuel J | Director | Other | 1,782 | 0.00 | – |
| 16. Jul 2026 | Eversole Robert M | Director | Other | 2,253 | 0.00 | – |
| 16. Jul 2026 | Fischer Alexander R | Director | Other | 1,110 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.