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): September 30, 2014

Graco Inc.

(Exact name of registrant as specified in charter)

Registrant’s telephone number, including area code: (612) 623-6000

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))

On September 30, 2014, Graco International Holdings SARL, a wholly owned subsidiary of Graco Inc., entered into a share purchase agreement, dated as of October 1, 2014, with the shareholders of Xamol Limited to acquire Alco Valves Group, a United Kingdom-headquartered manufacturer of valves used in Oil & Natural Gas and other industrial processes, for £72.2 million in cash, subject to customary post-closing adjustments. The completion of the acquisition occurred simultaneously with entry into the agreement. A copy of the press release announcing the acquisition is filed as Exhibit 99.1 hereto and is incorporated herein by reference.

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.