Advanced Drainage Systems, Inc. (WMS)
NYSE: WMS · Plastics Foam Products · Hilliard, OH · filing with the SEC since 2014
Grade5.6
◀ Past 5.9● Present 5.8▶ Future 5.0
Who owns Advanced Drainage Systems, Inc.
As filed with the SECHolders of 5% or more
3
Blackrock, Inc. holds 8.9% of Common Stock, as its SCHEDULE 13G/A filed Jul 17, 2025 says.
Directors and officers
19
report now, of 32 people on the record since 2014. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 3 named at left.
Holders of 5% or moreshare of the class, as filed
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 17, 2025 · Common Stock
Advanced Drainage Systems Inc. Employee Stock Ownership Plan Trust
SCHEDULE 13G · filed Feb 13, 2026 · Common Stock, par value $0.01 per share
Vanguard Capital Management
SCHEDULE 13G · filed Apr 29, 2026 · Common Stock
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%
What WMS reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
A D S Mexicana
An entity · legal entity · owns, named in the 10-K filed May 21, 2026
EQ TruePointe One
An entity · legal entity · owns, named in the 10-K filed May 21, 2026
National Diversified Sales
A company bought · acquisition · Jan 2026 · owns, named in the 10-K filed May 21, 2026
River Valley Pipe
A company bought · acquisition · Apr 2025 · owns, named in the 10-K filed May 21, 2026
Orenco Systems, Inc.
A company bought · acquisition · Sep 2024 · owns, named in the 10-K filed May 21, 2026
39 subsidiaries in 15 countries, from the list filed with the 10-K filed May 21, 2026.
Insider tradesForm 4
9sales
0purchases
0sales on a scheduled plan
4people selling
$14.8Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2025 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window4 of 48 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Barbour D. Scott | President & Chief Executive Officer | 3 | $11.9M | 0 | 0 | $0 |
| Eversole Robert M | director | 1 | $1.6M | 0 | 0 | $0 |
| Makowski Tim A | Vice President, Controller and Chief Accounting Officer | 2 | $700,000 | 0 | 0 | $0 |
| Waun Thomas J. Sr. | EVP, International | 3 | $600,000 | 0 | 0 | $0 |