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10-K primary document
WMS · Annual Report (Form 10-K) · Filed May 21, 2026

Advanced Drainage Systems Inc — 10-K exhibit

wms-20260331xex211.htm
Advanced Drainage Systems Inc on Boardroom Alpha
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Exhibit 21.1
LIST OF SUBSIDIARIES
The following entities were subsidiaries of the Registrant as of May 14, 2026. Pursuant to Item 601(b)(21)(ii) of Regulation S-K, certain subsidiaries of the Registrant which, considered in the aggregate as a single subsidiary, would not have constituted a significant subsidiary (as defined in Rule 1-02(w) of Regulation S-X) have been omitted.
NameJurisdiction of Incorporation or Organization
ADS Ventures, Inc.Delaware
StormTech LLCDelaware
ADS Worldwide, Inc.Delaware
ADS Europe Holding B.V.Netherlands
ADS Europe B.V.Netherlands
ADS Middle East FZEUnited Arab Emirates
ADS International, Inc.Delaware
ADS Mexicana, S.A. de C.V.(1)
Mexico
ADSM Centro América, S.A.Costa Rica
CEDEIM Centro de Desarrollo, Educación e Investigación de México, S.A. de C.V.
Mexico
ADSI-1, LLCDelaware
Teco S.r.lItaly
Fish Water Products Sdn. Bhd.Malaysia
ADSI-2, LLCDelaware
Teco Irrigation USA, Inc.California
Kimplas Piping Systems Private Limited(2)
India
Kimplas LimitedEngland and Wales
Hancor of Canada, Inc.Canada
Tubos y Plásticos ADS Chile Limitada(3)
Chile
Tuberias Tigre-ADS Limitada(4)
Chile
Tigre-ADS Argentina S.R.L.(5)
Argentina
Tigre-ADS Colombia Limitada(5)
Colombia
Tigre-ADS Peru S.A.C.(5)
Peru
Tubos Tigre-ADS do Brasil Limitada(5)
Brazil
Tubos y Plásticos Tigre-ADS de Chile Limitada(5)
Chile
ADS Strategic Services LLCDelaware
EQ Truepointe One, LLC(6)
Ohio
Green Line Polymers, LLCDelaware
The Traylor Group, Inc.Alabama
JET Polymer Recycling, LLCAlabama
Infiltrator Water Technologies, LLCDelaware
Delta Treatment Systems, LLCDelaware
Ezflow GP, LLCDelaware
Ezflow, L.P.(7)
Tennessee
Orenco Systems, Inc.Oregon
Presby Environmental Holdings, LLCDelaware
Presby Environmental, Inc.New Hampshire
Presby Plastics, Inc.New Hampshire
National Diversified Sales, Inc.California

(1) Owned 51% by ADS Worldwide, Inc. and 49% by our joint venture partner.
(2) Owned 99.9999% by ADSI-1, LLC and nominal interests are held by ADSI-2, LLC.
(3) Owned 86.6354% by ADS Worldwide, Inc. and 13.3646% by ADS International, Inc.
(4) Owned 50% by Tubos y Plásticos ADS Chile Limitada and the remaining 50% by our joint venture partner.
(5) Nominal interests are held by Tuberias Tigre-ADS Limitada and our joint venture partner.
(6) Owned 62.69% by Advanced Drainage Systems, Inc.
(7) Owned 99.99% by Infiltrator Water Technologies, LLC and 0.01% by EZflow GP, LLC.

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