13F Insight
DOSSIER · 13F Holders · Q1 2026CyclicalNet sold
WMS

ADVANCED DRAINAGE SYSTEMS

591 institutions still hold ADVANCED DRAINAGE SYSTEMS as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 00790r104·591 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 6.2%
vs prior quarter
13F value held
$5.5B
48.0% inst. owned
of float
Holders
591
-28 QoQ
filers reporting
Activity
+8 / −44
+821 added · −829 reduced
this quarter
Concentration
18.52%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

591 institutions reported WMS in Q1 2026. BlackRock, Inc. leads at 18.5% of the visible book. -28 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$1.0B7.4M0.02%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$496M3.6M0.03%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$469M3.4M0.01%Q1 202604
STATE STREET CORP
CIK 0000093751
$341M2.5M0.01%Q1 202605
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
CIK 0000861177
$336M2.5M0.07%Q1 202606
Pictet Asset Management Holding SA
CIK 0001993888
$302M2.2M0.32%Q1 202607
BAILLIE GIFFORD & CO
CIK 0001088875
$281M2.0M0.29%Q1 202608
FIRST TRUST ADVISORS LP
CIK 0001125816· Index
$280M2.0M0.20%Q1 202609
Impax Asset Management Group plc
CIK 0001749768
$264M1.9M1.84%Q1 202610
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$227M1.7M0.12%Q1 202611
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$184M1.3M0.01%Q1 202612
MORGAN STANLEY
CIK 0000895421
$183M1.3M0.01%Q1 202613
Amundi
CIK 0001330387
$177M1.3M0.05%Q1 202614
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$163M1.2M0.03%Q1 202615
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC
CIK 0001021223
$152M1.1M0.45%Q1 202616
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$146M1.1M0.03%Q1 202617
Invesco Ltd.
CIK 0000914208
$135M983K0.02%Q1 202618
CITADEL ADVISORS LLC
CIK 0001423053
$126M870K0.02%Q4 202519
Impactive Capital LP
CIK 0001786767
$117M856K8.52%Q1 202620
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$96M703K0.01%Q1 2026
Page 1 of 30
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