$WMS

$131.23 +$0.83 (0.64%) Close

$WMS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 75.4M shares outstanding

Who owns WMS?

By type of holder

Institutions 92.0% Insiders 3.2% Everyone else 4.8%

Concentration Top 10 holders own 38.1%

BlackRock, Inc. 9.9% · Vanguard Portfolio Management LLC 4.9%

Institutional ownership

92.0%

0.0 pts vs last qtr

Institutional holders

548

-28 vs last qtr

Net shares bought

+22.2K

by institutions in Q2 2026

New / sold out

60 / 88

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +1.3M
First Trust Advisors LP +616.7K

Biggest sellers in Q2 2026

Pictet Asset Management Holding SA −1.1M
William Blair Investment Management, LLC SOLD OUT −655.7K

Who is planning to sell?

Notices of proposed sale, last 12 months

$15.1M

6 notices from 5 people

Shares covered

100.9K

0.13% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Donald Scott Barbour Officer $11.9M
Eversole Robert M Director $1.61M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2017–FY2026

+39.1%

+3.74% a year

Each share's claim on the business

−28.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$1.24B vs $156M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years63% 3–5 years12% 1–3 years16% Under 1 year8%

Quarterly turnover

10.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting WMS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	7.5M	9.91%	+47.2K (+0.6%)	≤2021	0.0%
Shares held by quarter Peak holding7.9M (Q3'24) Change over 8 quarters−473.1K Share of the company9.910% BlackRock, Inc.'s full portfolio →
VP Vanguard Portfolio Management LLC	3.7M	4.91%	+89.9K (+2.5%)	≤2021	0.0%
Shares held by quarter Peak holding3.7M (Q2'26) Change over 8 quarters+3.7M Share of the company4.910% Vanguard Portfolio Management LLC's full portfolio →

BlackRock, Inc.

7.5M

% of company

9.91%

Change vs last qtr

+47.2K (+0.6%)

Held since

≤2021

Vanguard Portfolio Management LLC

3.7M

% of company

4.91%

Change vs last qtr

+89.9K (+2.5%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Advanced Drainage Systems Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting WMS on Form N-PORT; together they hold 37.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$385M	2.5M	3.25%	0.31%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$382M	2.4M	3.23%	0.02%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$385M

% of company

3.25%

% of the fund

0.31%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$382M

% of company

3.23%

% of the fund

0.02%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Advanced Drainage Systems Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SA Seetharam Anil Insider	1.5M	1.97%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.970% Seetharam Anil's insider activity →
BD Barbour D. Scott Insider	439.1K	0.58%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.580% Barbour D. Scott's insider activity →

Seetharam Anil

Insider

1.5M

% of company

1.97%

Change vs last qtr

—

Held since

—

Barbour D. Scott

Insider

439.1K

% of company

0.58%

Change vs last qtr

—

Held since

—

18 more holders behind a free account

See every insider and 5%+ holder of Advanced Drainage Systems Inc.

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