Advanced Drainage Systems WMS Institutional Ownership

NYSE WMS

$127.10 -4.68 (-3.55%)

As of: Sep 10, 2026 · 3:59 PM EDT

Institutions by Trading Activity

551 Institutions

Increased 258 46.8%

Unchanged 84 15.2%

Reduced 209 37.9%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

91.79%

▲+1.62 pp QoQ

Shares Held by Institutions

70.25Mn

of 76.53Mn outstanding

▲+5.58% QoQ

Shares Outstanding

76.53Mn

6.28Mn held outside 13F filers

Institutional Investors

551

filed 13F for Jun 2026

▼-20 vs prior quarter

Net Shares Added (QoQ)

+3.71Mn

accumulated since last quarter

Value of Holdings

$9.54Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Advanced Drainage Systems, Inc. (NYSE:WMS) has 551 institutional investors that have filed 13F reports for the period ending June 2026.

These investors collectively held 91.8% of Advanced Drainage Systems's outstanding shares in June 2026, up from 90.2% in March 2026.
They increased total shares held in WMS by 5.58% quarter over quarter, and investors in Advanced Drainage Systems increased 14.55% from a year ago.
During the quarter, 258 of these 551 funds increased positions in WMS, 209 reduced exposure, and 84 held steady.
Institutional investors collectively held 70.25Mn shares in Advanced Drainage Systems as of June 2026, up by 3.71Mn shares quarter on quarter, and down 2.45Mn shares year over year.
As of June 30, 2026, BlackRock, Inc. held the largest stake in Advanced Drainage Systems with 7.47Mn shares, accounting for 9.76% of total shares outstanding.
The largest buyers of Advanced Drainage Systems for the quarter ending June 2026 were NORGES BANK (1.3Mn), Sixth Street Partners Management Company, L.P. (696.5K), FIRST TRUST ADVISORS LP (616.7K), BAMCO INC /NY/ (389.28K), Jupiter Topco LLC (361.7K).
The largest sellers of Advanced Drainage Systems for the quarter ending June 2026 were Pictet Asset Management Holding SA (1.08Mn), ADAGE CAPITAL PARTNERS GP, L.L.C. (400.0K), WELLINGTON MANAGEMENT GROUP LLP (222.74K), BAILLIE GIFFORD & CO (212.05K), Westwood Holdings Group Inc (185.34K).
According to Business Quant data, leading holders of WMS for June 2026 are BlackRock, Inc. (7.47Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (3.71Mn), VANGUARD CAPITAL MANAGEMENT LLC (3.4Mn), State Street Corp (2.69Mn), FIRST TRUST ADVISORS LP (2.66Mn), UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC (2.35Mn), Impax Asset Management Group plc (1.85Mn), BAILLIE GIFFORD & CO (1.84Mn), AMERICAN CENTURY COMPANIES INC (1.63Mn), Morgan Stanley (1.39Mn).

Form 13F Holdings

551 Institutional Holders

Report period 30 Jun, 2026

Total shares held 70.25Mn

Of outstanding 91.79%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	7,469,940	9.76%	▲47,211	+0.64%	$1.17Bn
2	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	3,705,538	4.84%	▲89,851	+2.49%	$581.62Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	3,397,037	4.44%	▼26,666	-0.78%	$533.20Mn
4	State Street Corp	0000093751	2,693,665	3.52%	▲204,134	+8.20%	$422.80Mn
5	FIRST TRUST ADVISORS LP	0001125816	2,660,753	3.48%	▲616,696	+30.17%	$417.63Mn
6	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0000861177	2,346,623	3.07%	▼103,500	-4.22%	$368.33Mn
7	Impax Asset Management Group plc	0001749768	1,845,942	2.41%	▼81,568	-4.23%	$289.74Mn
8	BAILLIE GIFFORD & CO	0001088875	1,835,297	2.40%	▼212,052	-10.36%	$288.07Mn
9	AMERICAN CENTURY COMPANIES INC	0000748054	1,634,302	2.14%	▼23,451	-1.41%	$256.52Mn
10	Morgan Stanley	0000895421	1,393,836	1.82%	▲60,496	+4.54%	$218.78Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,367,443	1.79%	▲22,648	+1.68%	$214.69Mn
12	Amundi	0001330387	1,354,610	1.77%	▲65,938	+5.12%	$212.68Mn
13	NORGES BANK	0001374170	1,303,735	1.70%	▲1,303,735	0.00%	$204.63Mn
14	DIMENSIONAL FUND ADVISORS LP	0000354204	1,277,818	1.67%	▲86,040	+7.22%	$200.55Mn
15	Pictet Asset Management Holding SA	0001993888	1,127,974	1.47%	▼1,076,827	-48.84%	$177.04Mn
16	KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC	0001021223	1,035,255	1.35%	▼71,168	-6.43%	$162.49Mn
17	KBC Group NV	0001411133	923,696	1.21%	▲6,715	+0.73%	$144.98K
18	WELLINGTON MANAGEMENT GROUP LLP	0000902219	840,488	1.10%	▼222,743	-20.95%	$131.92Mn
19	Qube Research & Technologies Ltd	0001729829	839,820	1.10%	▲293,414	+53.70%	$131.82Mn
20	Invesco Ltd.	0000914208	835,672	1.09%	▼146,856	-14.95%	$131.17Mn

Showing 1 to 20 of 551 holders