Advanced Drainage Systems, Inc.
WMS- Exchange
- NYSE
- Industry
- Plastics Foam Products
- SEC CIK
- 0001604028
No open-market purchases or sales by Advanced Drainage Systems, Inc. insiders were filed in the last 90 days; 556 institutions reported holding it in 13F filings for Q2 2026, worth $10.9B in total; no superinvestor holds it.
Holders of 5% or more of WMS
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Advanced Drainage Systems, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 8.90%6.89M shares | – | Jul 17, 20251 filing | Jul 17, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
1 Schedule 13D or 13G filing on Advanced Drainage Systems, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jul 17, 20257:44 PM ET | BlackRock, Inc. | 13G/A | 8.90%6.89M shares | – | Jun 30, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Advanced Drainage Systems, Inc. shares.
No Form 144 notices for Advanced Drainage Systems, Inc. are on file.