Results of Operations

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 9, 2019 Commission file number 001-11625   Pentair plc (Exact name of Registrant as specified in its charter)           Ireland   98-1141328 (State or other jurisdiction of incorporation or organization)   (I.R.S. Employer Identification number) Regal House, 70 London Road, Twickenham, London, TW13QS United Kingdom (Address of principal executive offices) 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)) 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 9, 2019, Pentair plc (the “Company”) issued a press release announcing its preliminary financial results for the first quarter ended March 31, 2019 along with updated outlook for the full year 2019. A copy of the press release is furnished herewith as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The preliminary 2019 adjusted diluted earnings per share from continuing operations (“EPS”) include eliminates intangible amortization, certain targeted restructuring activities, impairments, deal related costs, inventory step-up, gain on sale of business and certain tax items. The 2018 adjusted EPS eliminates intangible amortization, certain targeted restructuring activities, corporate allocations, loss on sale of business, interest expense adjustments 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 revenue from acquired businesses recorded prior to the first anniversary of the acquisition less the amount of sales attributable to divested 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. These non-GAAP measures may not be comparable to similarly titled measures reported by other companies. The information included in this item, including Exhibit 99.1, is hereby furnished and 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 shall be expressly set forth by specific reference in such filing. ITEM 9.01 Financial Statements and Exhibits (d) Exhibits The exhibit listed in the following Exhibit Index is provided as part of the information furnished under Item 2.02 of this Current Report on Form 8-K: EXHIBIT INDEX Exhibit   Description 99.1    Pentair plc press release dated April 9, 2019 SIGNATURE 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, thereunto duly authorized, on April 9, 2019.   PENTAIR PLC   Registrant         By /s/ Mark C. Borin     Mark C. Borin     Executive Vice President and Chief Financial Officer