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 26, 2018 _________________________ ILLINOIS TOOL WORKS INC. (Exact name of registrant as specified in its charter) Delaware   1-4797   36-1258310 (State or other jurisdiction of incorporation)   (Commission File No.)   (I.R.S. Employer Identification No.)           155 Harlem Avenue, Glenview, IL       60025 (Address of principal executive offices)       (Zip Code) Registrant's telephone number, including area code: 847-724-7500 Not Applicable (Former name or former address, if changed since last report.) 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.  [   ] 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)) Item 2.02    Results of Operations and Financial Condition On April 26, 2018 , Illinois Tool Works Inc. (the “Company”) announced its 2018 first quarter results of operations in the press release furnished as Exhibit 99.1. Non-GAAP Financial Measures The Company presents certain financial measures for 2017 excluding the impact of the "Tax Cuts and Jobs Act" and the benefit of a legal settlement in fiscal year 2017. These non-GAAP measures are consistent with the way management analyzes and assesses the Company’s operating performance. The Company believes these non-GAAP measures enhance investors’ understanding of the Company’s underlying financial performance, as well as their ability to compare the Company’s financial results and overall performance to that of its peers. A reconciliation of the impact of the "Tax Cuts and Jobs Act" and legal settlement is included in the press release furnished as Exhibit 99.1. The Company uses free cash flow to measure cash flow generated by operations that is available for dividends, share repurchases, acquisitions and debt repayment. The Company believes this non-GAAP financial measure is useful to investors in evaluating the Company’s financial performance and measures the Company's ability to generate cash internally to fund Company initiatives. Free cash flow represents net cash provided by operating activities less additions to plant and equipment. Free cash flow is a measurement that is not the same as net cash flow from operating activities per the statement of cash flows and may not be consistent with similarly titled measures used by other companies. A reconciliation of free cash flow to net cash provided by operating activities is included in the press release furnished as Exhibit 99.1. The Company uses after-tax return on average invested capital ("ROIC") to measure the effectiveness of its operations’ use of invested capital to generate profits. ROIC is a non-GAAP financial measure that the Company believes is a meaningful metric to investors in evaluating the Company’s financial performance and may be different than the method used by other companies to calculate ROIC. Average invested capital represents the net assets of the Company, excluding cash and equivalents and outstanding debt, which are excluded as they do not represent capital investment in the Company's operations. Average invested capital is calculated using balances at the start of the period and at the end of each quarter. A calculation of ROIC is included in the press release furnished as Exhibit 99.1. Item 9.01    Financial Statements and Exhibits (d) Exhibits               Exhibit Number   Exhibit Description           99.1   Press Release issued by Illinois Tool Works Inc. dated April 26, 2018 (furnished pursuant to Item 2.02). SIGNATURES Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.           ILLINOIS TOOL WORKS INC.             Dated: April 26, 2018   By: /s/ Michael M. Larsen     Michael M. Larsen     Senior Vice President & Chief Financial Officer