PNR

pnr-20260710

0000077360false00000773602026-07-102026-07-10

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): July 10, 2026

Pentair plc

(Exact name of registrant as specified in its charter)

Ireland001-1162598-1141328

(State or other jurisdiction of incorporation or organization)(Commission File No.)(I.R.S. Employer Identification No.)

Regal House, 70 London Road, Twickenham, London, TW13QS United Kingdom

(Address of principal executive offices)        (Zip Code)

Registrant’s telephone number, including area code: 44-74-9421-6154

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:

☐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 classTrading Symbol(s)Name of each exchange on which registered

Ordinary Shares, nominal value $0.01 per sharePNRNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act (17 CFR 230.405) or Rule 12b-2 of the Exchange Act (17 CFR 240.12b-2). ☐ 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 2.02    Results of Operations and Financial Condition

On July 14, 2026, Pentair plc (the “Company”) issued a press release announcing its preliminary earnings for the second quarter of 2026. A copy of the release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

This press release refers to certain non-generally accepted accounting principles (“GAAP”) financial measures (adjusted operating income, adjusted return on sales, adjusted net income from continuing operations, adjusted diluted earnings per share from continuing operations and EBITDA) and a reconciliation of those non-GAAP financial measures to the corresponding financial measures contained in the Company’s financial statements prepared in accordance with GAAP.

The 2026 adjusted operating income, adjusted return on sales, adjusted net income from continuing operations and adjusted diluted earnings per share from continuing operations (“EPS”) include equity income of unconsolidated subsidiaries and eliminate intangible amortization, costs of certain restructuring, transformation and other activities and certain tax items. The 2025 adjusted operating income, adjusted return on sales, adjusted net income from continuing operations and adjusted diluted EPS include equity income of unconsolidated subsidiaries and eliminate intangible amortization, costs of certain restructuring, transformation and other activities, certain legal accrual adjustments and settlements, asset impairment and write-offs, loss on sale of business, deal-related costs and expenses, pension and other post-retirement mark-to-market loss and certain tax items.

Our definition of earnings before interest, taxes, depreciation and amortization (“EBITDA”) represents adjusted operating income plus depreciation. This measure is not a measurement of our financial performance or liquidity under GAAP and should not be considered as an alternative to net income, operating income from continuing operations or any other performance measures derived in accordance with GAAP or as an alternative to cash flows from operating activities as measures of our liquidity.

Management utilizes these adjusted financial measures to assess the run-rate of its continuing operations against those of prior periods without the distortion of these factors. The Company believes that these non-GAAP financial measures will be useful to investors as well to assess the continuing strength of the Company’s underlying operations. In addition, adjusted EPS is used as a criterion to measure and pay long-term incentive compensation and adjusted operating income is used as a criterion to measure and pay annual incentive compensation. These non-GAAP measures may not be comparable to similarly titled measures reported by other companies.

ITEM 5.02    Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

On July 10, 2026, Nicholas J. Brazis, the Executive Vice President and Chie

pnr-20260428

0000077360false00000773602026-04-282026-04-28

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): April 28, 2026

Pentair plc

(Exact name of registrant as specified in its charter)

Ireland001-1162598-1141328

(State or other jurisdiction of incorporation or organization)(Commission File No.)(I.R.S. Employer Identification No.)

Regal House, 70 London Road, Twickenham, London, TW13QS United Kingdom

(Address of principal executive offices)        (Zip Code)

Registrant’s telephone number, including area code: 44-74-9421-6154

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:

☐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 classTrading Symbol(s)Name of each exchange on which registered

Ordinary Shares, nominal value $0.01 per sharePNRNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act (17 CFR 230.405) or Rule 12b-2 of the Exchange Act (17 CFR 240.12b-2). ☐ 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 2.02 Results of Operations and Financial Condition

On April 28, 2026, Pentair plc (the “Company”) issued a press release announcing its earnings for the first quarter of 2026 and a conference call in connection therewith. A copy of the release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

This press release refers to certain non-generally accepted accounting principles (“GAAP”) financial measures (core sales, adjusted operating income, adjusted return on sales, adjusted net income from continuing operations, adjusted diluted earnings per share from continuing operations and free cash flow) and a reconciliation of those non-GAAP financial measures to the corresponding financial measures contained in the Company’s financial statements prepared in accordance with GAAP.

The 2026 adjusted operating income, adjusted return on sales, adjusted net income from continuing operations and adjusted diluted earnings per share from continuing operations (“EPS”) include equity income of unconsolidated subsidiaries and eliminate intangible amortization, costs of certain restructuring, transformation and other activities and certain tax items. The 2025 adjusted operating income, adjusted return on sales, adjusted net income from continuing operations and adjusted diluted EPS include equity income of unconsolidated subsidiaries and eliminate intangible amortization, costs of certain restructuring, transformation and other activities, certain legal accrual adjustments and settlements, asset impairment and write-offs, loss on sale of business, deal-related costs and expenses, pension and other post-retirement mark-to-market loss and certain tax items.

We use the term “core sales” to refer to GAAP net sales from continuing operations excluding (1) the impact of currency translation and (2) the impact of net sales from acquired businesses recorded prior to the first anniversary of the acquisition, excluding the excess over prior year net sales of the acquired business less the net sales attributable to discontinued or divested businesses/product lines not considered discontinued operations (“acquisition sales”). The portion of GAAP net sales attributable to currency translation is calculated as the difference between (a) the period-to-period change in net sales (excluding acquisition sales) and (b) the period-to-period change in net sales (excluding acquisition sales) after applying current period foreign exchange rates to the prior year period. We use the term “core sales growth” to refer to the measure of comparing current period core net sales with the corresponding period of the prior year.

Management utilizes these adjusted financial measures to assess the run-rate of its continuing operations against those of prior periods without the distortion of these factors. The Company believes that these non-GAAP financial measures will be useful to investors as well to assess the continuing strength of the Company’s underlying operations. In addition, adjusted EPS is u

pnr-202602030000077360false00000773602026-02-032026-02-03

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): February 3, 2026

Pentair plc (Exact name of registrant as specified in its charter)

Ireland001-1162598-1141328 (State or other jurisdiction of incorporation or organization) (Commission File No.)(I.R.S. Employer Identification No.)

Regal House, 70 London Road, Twickenham, London, TW13QS United Kingdom (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: 44-74-9421-6154

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:

☐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 classTrading Symbol(s)Name of each exchange on which registered Ordinary Shares, nominal value $0.01 per sharePNRNew York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act (17 CFR 230.405) or Rule 12b-2 of the Exchange Act (17 CFR 240.12b-2). ☐ 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 2.02 Results of Operations and Financial Condition On February 3, 2026, Pentair plc (the “Company”) issued a press release announcing its earnings for the fourth quarter and full year of 2025 and a conference call in connection therewith. A copy of the release is attached hereto as Exhibit 99.1 and incorporated herein by reference. This press release refers to certain non-generally accepted accounting principles (“GAAP”) financial measures (core sales, adjusted operating income, adjusted return on sales, adjusted net income from continuing operations, adjusted diluted earnings per share from continuing operations and free cash flow) and a reconciliation of those non-GAAP financial measures to the corresponding financial measures contained in the Company’s financial statements prepared in accordance with GAAP. The 2025 adjusted operating income, adjusted return on sales, adjusted net income from continuing operations and adjusted diluted earnings per share from continuing operations (“EPS”) include equity income of unconsolidated subsidiaries and eliminate intangible amortization, costs of certain restructuring, transformation and other activities, certain legal accrual adjustments and settlements, asset impairment and write-offs, loss on sale of business, deal-related costs and expenses, pension and other post-retirement mark-to-market loss and certain tax items. The 2024 adjusted operating income, adjusted return on sales, adjusted net income from continuing operations and adjusted diluted EPS include equity income of unconsolidated subsidiaries and eliminate intangible amortization, costs of certain restructuring, transformation and other activities, certain legal accrual adjustments and settlements, asset impairment and write-offs, pension and other post-retirement mark-to-market gain, other income and certain tax items. We use the term “core sales” to refer to GAAP net sales from continuing operations excluding (1) the impact of currency translation and (2) the impact of net sales from acquired businesses recorded prior to the first anniversary of the acquisition, excluding the excess over prior year net sales of the acquired business less the amount of net sales attributable to discontinued or divested businesses/product lines not considered discontinued operations (“acquisition sales”). The portion of GAAP net sales attributable to currency translation is calculated as the difference between (a) the period-to-period change in net sales (excluding acquisition sales) and (b) the period-to-period change in net sales (excluding acquisition sales) after applying current period foreign exchange rates to the prior year period. We use the term “core sales growth” to refer to the measure of comparing current period core net sales with the corresponding period of the prior year. Management utilizes these adjusted financial measures to assess the run-rate of its continuing operations against those of prior periods without the distortion of these factors. The Company believes tha