Advanced Drainage Systems, Inc. (WMS) Institutional Ownership & Insider Trading

550 institutions reported holding Advanced Drainage Systems, Inc. shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 9 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

WMSAdvanced Drainage Systems, Inc.Follow WMS — free

Building Products & Equipment · Industrials

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Market cap: 9.8B
P/E TTM: 22.5
Dividend yield: 0.6%
52-week: —
Next earnings: 5 Nov, in 12 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

550 institutions held 92.4% of the shares. Across filers that reported both quarters, shares held changed -1.4%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	550	70	-1.4%	171	43	186	71
Mar 26	573	69	-1.7%	197	77	157	44
Dec 25	535	71	-3.6%	138	64	187	23
Sep 25	486	72	+1.5%	150	61	159	43
Jun 25	473	72	+4.2%	153	61	151	44
Mar 25	451	68	+4.6%	171	44	132	48
Dec 24	453	67	+1.7%	163	43	139	68
Sep 24	475	65	+0.8%	146	49	167	64

Advanced Drainage Systems, Inc. — questions

Who owns Advanced Drainage Systems, Inc. stock?: 550 institutions reported Advanced Drainage Systems, Inc. shares in 13F filings for the quarter ended 2026-06-30. The largest: BlackRock, Inc. (9.9%), VANGUARD PORTFOLIO MANAGEMENT LLC (4.9%), VANGUARD CAPITAL MANAGEMENT LLC (4.5%).
Are Advanced Drainage Systems, Inc. insiders buying or selling?: 9 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from Advanced Drainage Systems, Inc.'s own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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