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Form 8-K

sec.gov

8-K — ADVANCED DRAINAGE SYSTEMS, INC.

Accession: 0001604028-26-000020

Filed: 2026-05-21

Period: 2026-05-21

CIK: 0001604028

SIC: 3086 (PLASTICS FOAM PRODUCTS)

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — wms-20260521.htm (Primary)

EX-99.1 (wms-20260521_d2.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

XML — IDEA: XBRL DOCUMENT (R2.htm)

8-K

8-K (Primary)

Filename: wms-20260521.htm · Sequence: 1

wms-20260521

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 21, 2026

ADVANCED DRAINAGE SYSTEMS, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware 001-36557 51-0105665

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

4024 Green Stripe Lane

43026

Hilliard,

Ohio

(Address of Principal Executive Offices)   (Zip Code)

Registrant’s Telephone Number, Including Area Code: (800) 733-7473

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instructions A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange on which registered

Common Stock, $0.01 par value per share   WMS   New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01    Regulation FD Disclosure

As previously reported in the Form 10-K and the Form 8-K filed on May 21, 2026 for the fiscal year ended March 31, 2026 by Advanced Drainage Systems, Inc. (the “Company”) or (“ADS”), following the acquisition of National Diversified Sales (“NDS”) we realigned our reportable segments to align with the manner in which the Chief Operating Decision Maker (“CODM”) assesses performance and makes resource allocation decisions (the “Segment Realignment”). Our revised reportable segments consist of Stormwater and Wastewater (formerly referred to as the “Infiltrator” reportable segment). Further, we changed the measure used to evaluate segment profitability from adjusted gross profit to Adjusted EBITDA.

Segment results for the historical periods presented in these consolidated financial statements have been recast to reflect these changes. The Segment Realignment had no impact on our previously reported consolidated net sales, income from operations, net income attributable to ADS or earnings per share.

ADS provided certain recast historical financial information for quarterly periods within fiscal 2026, 2025 and 2024 attached hereto as Exhibit 99.1 to this Current Report on Form 8-K. The information included in this Current Report on Form 8-K is unaudited and presented for informational purposes only in connection with the matters described above and does not amend or restate any of the Company’s previously issued financial statements. This Current Report on Form 8-K should be read in conjunction with the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2026. The recast financial information furnished in Exhibit 99.1 hereto is included for supplemental purposes only. The information furnished in this Item 7.01, including Exhibit 99.1 hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01    Financial Statements and Exhibits.

(d)Exhibits

The following exhibits are being furnished as part of this report:

99.1

Recast of Historical Segment Information

104   Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ADVANCED DRAINAGE SYSTEMS, INC.

Date: May 21, 2026 By: /s/ Scott A. Cottrill

Name: Scott A. Cottrill

Title: EVP, CFO & Secretary

EX-99.1

EX-99.1

Filename: wms-20260521_d2.htm · Sequence: 2

wms-20260521_d2

Exhibit 99.1

The following tables set forth Net sales, significant segment expenses, and Adjusted EBITDA for each of the Company’s reportable segments for the periods presented:

Three Months Ended June 30, 2025

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 651,527  $ 178,353  $ —  $ 829,880

Intersegment net sales 9,076  16,609  (25,685) —

Net sales 660,603  194,962  (25,685) 829,880

Significant segment expenses:

Costs of goods sold 427,119  97,251  (24,928) 499,442

Selling, general and administrative expenses 73,782  18,344  —  92,126

Other segment items(a)

(43,793) (7,897) —  (51,690)

Segment Adjusted EBITDA(b)

$ 203,495  $ 87,264  $ (757)

Corporate and other costs(c)

11,835

Total consolidated Adjusted EBITDA $ 278,167

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 23,029

Interest income (5,405)

Depreciation and amortization 50,228

Stock-based compensation expense 8,404

Loss (gain) on disposal of assets and costs from exit and disposal activities 7,024

Transaction costs(d)

807

Other adjustments(e)

4,658

Income before income taxes 189,422

Income tax expense 46,674

Equity in net income of unconsolidated affiliates (1,343)

Net income from continuing operations $ 144,091

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended September 30, 2025

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 670,665  $ 179,716  $ —  $ 850,381

Intersegment net sales 9,346  16,652  (25,998) —

Net sales 680,011  196,368  (25,998) 850,381

Significant segment expenses:

Costs of goods sold 435,834  100,525  (26,110) 510,249

Selling, general and administrative expenses 88,979  18,861  —  107,840

Other segment items(a)

(55,420) (11,204) —  (66,624)

Segment Adjusted EBITDA(b)

$ 210,618  $ 88,186  $ 112

Corporate and other costs(c)

11,384

Total consolidated Adjusted EBITDA $ 287,532

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 23,116

Interest income (7,340)

Depreciation and amortization 54,693

Stock-based compensation expense 8,577

Loss (gain) on disposal of assets and costs from exit and disposal activities (15,926)

Transaction costs(d)

9,317

Other adjustments(e)

6,904

Income before income taxes 208,191

Income tax expense 52,399

Equity in net income of unconsolidated affiliates (708)

Net income from continuing operations $ 156,500

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended December 31, 2025

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 540,473  $ 152,881  $ —  $ 693,354

Intersegment net sales 9,174  14,785  (23,959) —

Net sales 549,647  167,666  (23,959) 693,354

Significant segment expenses:

Costs of goods sold 372,861  84,381  (23,040) 434,202

Selling, general and administrative expenses 79,359  16,107  —  95,466

Other segment items(a)

(51,356) (7,451) —  (58,807)

Segment Adjusted EBITDA(b)

$ 148,783  $ 74,629  $ (919)

Corporate and other costs(c)

13,276

Total consolidated Adjusted EBITDA $ 209,217

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 22,579

Interest income (8,450)

Depreciation and amortization 51,522

Stock-based compensation expense 8,835

Loss (gain) on disposal of assets and costs from exit and disposal activities 87

Transaction costs(d)

7,172

Other adjustments(e)

4,729

Income before income taxes 122,743

Income tax expense 30,557

Equity in net income of unconsolidated affiliates (1,851)

Net income from continuing operations $ 94,037

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended March 31, 2026

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 534,749  $ 142,012  $ —  $ 676,761

Intersegment net sales 8,870  13,534  (22,404) —

Net sales 543,619  155,546  (22,404) 676,761

Significant segment expenses:

Costs of goods sold 377,356  85,806  (24,065) 439,097

Selling, general and administrative expenses 106,709  15,690  —  122,399

Other segment items(a)

(80,625) (7,323) —  (87,948)

Segment Adjusted EBITDA(b)

$ 140,179  $ 61,373  $ 1,661

Corporate and other costs(c)

15,223

Total consolidated Adjusted EBITDA $ 187,990

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 25,145

Interest income (3,805)

Depreciation and amortization 59,818

Stock-based compensation expense 6,538

Loss (gain) on disposal of assets and costs from exit and disposal activities 28,026

Transaction costs(d)

23,509

Other adjustments(e)

9,327

Income before income taxes 39,432

Income tax expense 5,358

Equity in net income of unconsolidated affiliates (1,161)

Net income from continuing operations $ 35,235

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended June 30, 2024

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 668,034  $ 147,302  $ —  $ 815,336

Intersegment net sales 9,319  16,840  (26,159) —

Net sales 677,353  164,142  (26,159) 815,336

Significant segment expenses:

Costs of goods sold 430,226  77,535  (24,879) 482,882

Selling, general and administrative expenses 72,420  10,504  —  82,924

Other segment items(a)

(30,189) (6,907) —  (37,096)

Segment Adjusted EBITDA(b)

$ 204,896  $ 83,010  $ (1,280)

Corporate and other costs(c)

11,128

Total consolidated Adjusted EBITDA $ 275,498

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 22,824

Interest income (6,565)

Depreciation and amortization 41,098

Stock-based compensation expense 6,977

Loss (gain) on disposal of assets and costs from exit and disposal activities 292

Transaction costs(d)

10

Other adjustments(e)

355

Income before income taxes 210,507

Income tax expense 49,886

Equity in net income of unconsolidated affiliates (1,701)

Net income from continuing operations $ 162,322

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended September 30, 2024

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 639,012  $ 143,598  $ —  $ 782,610

Intersegment net sales 8,885  13,923  (22,808) —

Net sales 647,897  157,521  (22,808) 782,610

Significant segment expenses:

Costs of goods sold 439,031  71,812  (22,174) 488,669

Selling, general and administrative expenses 74,133  10,956  —  85,089

Other segment items(a)

(38,938) (6,803) —  (45,741)

Segment Adjusted EBITDA(b)

$ 173,671  $ 81,556  $ (634)

Corporate and other costs(c)

9,043

Total consolidated Adjusted EBITDA $ 245,550

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 23,156

Interest income (7,368)

Depreciation and amortization 44,807

Stock-based compensation expense 6,983

Loss (gain) on disposal of assets and costs from exit and disposal activities 617

Transaction costs(d)

2,685

Other adjustments(e)

3,494

Income before income taxes 171,176

Income tax expense 40,920

Equity in net income of unconsolidated affiliates (918)

Net income from continuing operations $ 131,174

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended December 31, 2024

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 540,525  $ 150,013  $ —  $ 690,538

Intersegment net sales 8,913  10,063  (18,976) —

Net sales 549,438  160,076  (18,976) 690,538

Significant segment expenses:

Costs of goods sold 384,562  85,105  (20,723) 448,944

Selling, general and administrative expenses 73,739  17,196  —  90,935

Other segment items(a)

(40,110) (10,559) —  (50,669)

Segment Adjusted EBITDA(b)

$ 131,247  $ 68,334  $ 1,747

Corporate and other costs(c)

9,843

Total consolidated Adjusted EBITDA $ 191,485

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 23,094

Interest income (4,545)

Depreciation and amortization 47,766

Stock-based compensation expense 7,798

Loss (gain) on disposal of assets and costs from exit and disposal activities (477)

Transaction costs(d)

5,924

Other adjustments(e)

3,363

Income before income taxes 108,562

Income tax expense 27,091

Equity in net income of unconsolidated affiliates (818)

Net income from continuing operations $ 82,289

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended March 31, 2025

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 478,799  $ 136,962  $ —  $ 615,761

Intersegment net sales 8,530  11,205  (19,735) —

Net sales 487,329  148,167  (19,735) 615,761

Significant segment expenses:

Costs of goods sold 329,009  80,013  (19,513) 389,509

Selling, general and administrative expenses 62,585  16,530  —  79,115

Other segment items(a)

(34,371) (7,488) —  (41,859)

Segment Adjusted EBITDA(b)

$ 130,106  $ 59,112  $ (222)

Corporate and other costs(c)

12,301

Total consolidated Adjusted EBITDA $ 176,695

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 22,729

Interest income (5,007)

Depreciation and amortization 49,610

Stock-based compensation expense 4,823

Loss (gain) on disposal of assets and costs from exit and disposal activities 3,426

Transaction costs(d)

672

Other adjustments(e)

1,222

Income before income taxes 99,220

Income tax expense 23,166

Equity in net income of unconsolidated affiliates (734)

Net income from continuing operations $ 76,788

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended June 30, 2023

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 637,429  $ 140,617  $ —  $ 778,046

Intersegment net sales 7,737  11,081  (18,818) —

Net sales 645,166  151,698  (18,818) 778,046

Significant segment expenses:

Costs of goods sold 387,377  77,232  (18,023) 446,586

Selling, general and administrative expenses 65,138  9,916  —  75,054

Other segment items(a)

(30,193) (6,171) —  (36,364)

Segment Adjusted EBITDA(b)

$ 222,844  $ 70,721  $ (795)

Corporate and other costs(c)

11,457

Total consolidated Adjusted EBITDA $ 281,313

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 21,712

Interest income (3,489)

Depreciation and amortization 37,240

Stock-based compensation expense 6,903

Loss (gain) on disposal of assets and costs from exit and disposal activities (13,304)

Transaction costs(d)

1,972

Other adjustments(e)

2,991

Income before income taxes 227,288

Income tax expense 55,058

Equity in net income of unconsolidated affiliates (1,675)

Net income from continuing operations $ 173,905

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended September 30, 2023

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 648,757  $ 131,463  $ —  $ 780,220

Intersegment net sales 7,479  11,473  (18,952) —

Net sales 656,236  142,936  (18,952) 780,220

Significant segment expenses:

Costs of goods sold 427,291  68,450  (18,198) 477,543

Selling, general and administrative expenses 69,785  9,622  —  79,407

Other segment items(a)

(29,375) (5,923) —  (35,298)

Segment Adjusted EBITDA(b)

$ 188,535  $ 70,787  $ (754)

Corporate and other costs(c)

12,318

Total consolidated Adjusted EBITDA $ 246,250

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 21,941

Interest income (5,137)

Depreciation and amortization 36,721

Stock-based compensation expense 9,331

Loss (gain) on disposal of assets and costs from exit and disposal activities 123

Transaction costs(d)

52

Other adjustments(e)

(383)

Income before income taxes 183,602

Income tax expense 47,476

Equity in net income of unconsolidated affiliates (901)

Net income from continuing operations $ 137,027

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended December 31, 2023

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 543,895  $ 118,472  $ —  $ 662,367

Intersegment net sales 7,883  20,029  (27,912) —

Net sales 551,778  138,501  (27,912) 662,367

Significant segment expenses:

Costs of goods sold 358,306  69,978  (25,766) 402,518

Selling, general and administrative expenses 66,324  9,776  —  76,100

Other segment items(a)

(29,566) (6,080) —  (35,646)

Segment Adjusted EBITDA(b)

$ 156,714  $ 64,827  $ (2,146)

Corporate and other costs(c)

15,189

Total consolidated Adjusted EBITDA $ 204,206

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 22,331

Interest income (6,515)

Depreciation and amortization 38,053

Stock-based compensation expense 7,402

Loss (gain) on disposal of assets and costs from exit and disposal activities 2,512

Transaction costs(d)

1,030

Other adjustments(e)

3,686

Income before income taxes 135,707

Income tax expense 30,131

Equity in net income of unconsolidated affiliates (1,304)

Net income from continuing operations $ 106,880

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

Three Months Ended March 31, 2024

(Amounts in thousands) Stormwater Wastewater Intersegment Eliminations Total

Net sales:

Net sales from external customers $ 531,439  $ 122,401  $ —  $ 653,840

Intersegment net sales 7,550  11,014  (18,564) —

Net sales 538,989  133,415  (18,564) 653,840

Significant segment expenses:

Costs of goods sold 352,852  68,080  (19,055) 401,877

Selling, general and administrative expenses 74,095  11,325  —  85,420

Other segment items(a)

(33,832) (6,572) —  (40,404)

Segment Adjusted EBITDA(b)

$ 145,874  $ 60,582  $ 491

Corporate and other costs(c)

15,769

Total consolidated Adjusted EBITDA $ 191,178

Reconciliation of total consolidated Adjusted EBITDA to income from continuing operations before income taxes:

Interest expense 22,878

Interest income (6,906)

Depreciation and amortization 42,889

Stock-based compensation expense 8,350

Loss (gain) on disposal of assets and costs from exit and disposal activities 2,304

Transaction costs(d)

390

Other adjustments(e)

1,117

Income before income taxes 120,156

Income tax expense 26,333

Equity in net income of unconsolidated affiliates (1,656)

Net income from continuing operations $ 95,479

a.Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

b.The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

c.Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

d.Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

e.Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

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51-0105665

Entity Address, Address Line One

4024 Green Stripe Lane

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Segment Reporting (Details) - USD ($)

$ in Thousands

3 Months Ended

Mar. 31, 2026

Dec. 31, 2025

Sep. 30, 2025

Jun. 30, 2025

Mar. 31, 2025

Dec. 31, 2024

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Dec. 31, 2023

Sep. 30, 2023

Jun. 30, 2023

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

$ 676,761

$ 693,354

$ 850,381

$ 829,880

$ 615,761

$ 690,538

$ 782,610

$ 815,336

$ 653,840

$ 662,367

$ 780,220

$ 778,046

Cost Of Goods Sold, Excluding Employee Stock Option Plan Special Dividend Compensation

439,097

434,202

510,249

499,442

389,509

448,944

488,669

482,882

401,877

402,518

477,543

446,586

Selling, General and Administrative Expense, Excluding Employee Stock Option Plan Special Dividend Compensation, Before Corporate and other costs

122,399

95,466

107,840

92,126

79,115

90,935

85,089

82,924

85,420

76,100

79,407

75,054

Segment Reporting, Other Segment Item, Amount

(87,948)

(58,807)

(66,624)

(51,690)

(41,859)

(50,669)

(45,741)

(37,096)

(40,404)

(35,646)

(35,298)

(36,364)

Operating Expenses

15,223

13,276

11,384

11,835

12,301

9,843

9,043

11,128

15,769

15,189

12,318

11,457

Consolidated Adjusted EBITDA

187,990

209,217

287,532

278,167

176,695

191,485

245,550

275,498

191,178

204,206

246,250

281,313

Interest Income (Expense), Nonoperating

25,145

22,579

23,116

23,029

22,729

23,094

23,156

22,824

22,878

22,331

21,941

21,712

Interest Income, Other

(3,805)

(8,450)

(7,340)

(5,405)

(5,007)

(4,545)

(7,368)

(6,565)

(6,906)

(6,515)

(5,137)

(3,489)

Depreciation, Depletion and Amortization, Nonproduction

59,818

51,522

54,693

50,228

49,610

47,766

44,807

41,098

42,889

38,053

36,721

37,240

Employee Benefit and Share-Based Payment Arrangement, Noncash

6,538

8,835

8,577

8,404

4,823

7,798

6,983

6,977

8,350

7,402

9,331

6,903

Transaction costs

23,509

7,172

9,317

807

672

5,924

2,685

10

390

1,030

52

1,972

Other Adjusted EBITDA adjustments

9,327

4,729

6,904

4,658

1,222

3,363

3,494

355

1,117

3,686

(383)

2,991

Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest

39,432

122,743

208,191

189,422

99,220

108,562

171,176

210,507

120,156

135,707

183,602

227,288

Income Tax Expense (Benefit)

5,358

30,557

52,399

46,674

23,166

27,091

40,920

49,886

26,333

30,131

47,476

55,058

Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest

35,235

94,037

156,500

144,091

76,788

82,289

131,174

162,322

95,479

106,880

137,027

173,905

Income (Loss) from Equity Method Investments

(1,161)

(1,851)

(708)

(1,343)

(734)

(818)

(918)

(1,701)

(1,656)

(1,304)

(901)

(1,675)

Gain (Loss) on Disposition of Assets for Financial Service Operations

28,026

87

(15,926)

7,024

3,426

(477)

617

292

2,304

2,512

123

(13,304)

Intersegment Eliminations

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

(22,404)

(23,959)

(25,998)

(25,685)

(19,735)

(18,976)

(22,808)

(26,159)

(18,564)

(27,912)

(18,952)

(18,818)

Cost Of Goods Sold, Excluding Employee Stock Option Plan Special Dividend Compensation

(24,065)

(23,040)

(26,110)

(24,928)

(19,513)

(20,723)

(22,174)

(24,879)

(19,055)

(25,766)

(18,198)

(18,023)

Segment Adjusted EBITDA

1,661

(919)

112

(757)

(222)

1,747

(634)

(1,280)

491

(2,146)

(754)

(795)

Stormwater Segment

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

534,749

540,473

670,665

651,527

478,799

540,525

639,012

668,034

531,439

543,895

648,757

637,429

Stormwater Segment | Intersegment Eliminations

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

8,870

9,174

9,346

9,076

8,530

8,913

8,885

9,319

7,550

7,883

7,479

7,737

Stormwater Segment | Operating Segments

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

543,619

549,647

680,011

660,603

487,329

549,438

647,897

677,353

538,989

551,778

656,236

645,166

Cost Of Goods Sold, Excluding Employee Stock Option Plan Special Dividend Compensation

377,356

372,861

435,834

427,119

329,009

384,562

439,031

430,226

352,852

358,306

427,291

387,377

Selling, General and Administrative Expense, Excluding Employee Stock Option Plan Special Dividend Compensation, Before Corporate and other costs

106,709

79,359

88,979

73,782

62,585

73,739

74,133

72,420

74,095

66,324

69,785

65,138

Segment Reporting, Other Segment Item, Amount

(80,625)

(51,356)

(55,420)

(43,793)

(34,371)

(40,110)

(38,938)

(30,189)

(33,832)

(29,566)

(29,375)

(30,193)

Segment Adjusted EBITDA

140,179

148,783

210,618

203,495

130,106

131,247

173,671

204,896

145,874

156,714

188,535

222,844

Wastewater Segment

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

142,012

152,881

179,716

178,353

136,962

150,013

143,598

147,302

122,401

118,472

131,463

140,617

Wastewater Segment | Intersegment Eliminations

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

13,534

14,785

16,652

16,609

11,205

10,063

13,923

16,840

11,014

20,029

11,473

11,081

Wastewater Segment | Operating Segments

Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]

Revenue from Contract with Customer, Excluding Assessed Tax

155,546

167,666

196,368

194,962

148,167

160,076

157,521

164,142

133,415

138,501

142,936

151,698

Cost Of Goods Sold, Excluding Employee Stock Option Plan Special Dividend Compensation

85,806

84,381

100,525

97,251

80,013

85,105

71,812

77,535

68,080

69,978

68,450

77,232

Selling, General and Administrative Expense, Excluding Employee Stock Option Plan Special Dividend Compensation, Before Corporate and other costs

15,690

16,107

18,861

18,344

16,530

17,196

10,956

10,504

11,325

9,776

9,622

9,916

Segment Reporting, Other Segment Item, Amount

(7,323)

(7,451)

(11,204)

(7,897)

(7,488)

(10,559)

(6,803)

(6,907)

(6,572)

(6,080)

(5,923)

(6,171)

Segment Adjusted EBITDA

$ 61,373

$ 74,629

$ 88,186

$ 87,264

$ 59,112

$ 68,334

$ 81,556

$ 83,010

$ 60,582

$ 64,827

$ 70,787

$ 70,721

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