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 13, 2014

SIGNET JEWELERS LIMITED

(Exact name of registrant as specified in its charter)

Commission File Number: 1-32349

Clarendon House

2 Church Street

Hamilton

HM11

Bermuda

(Address of principal executive offices, including zip code)

441 296 5872

(Registrant’s telephone number, including area code)

(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:

Item 2.02. Results of Operations and Financial Condition.

Signet Jewelers Limited (NYSE and LSE: SIG) reaffirms its first quarter Fiscal 2015 financial guidance first introduced in a press release on March 27, 2014.

Item 7.01. Regulation FD Disclosure.

The disclosure under Item 2.02 is hereby incorporated by reference into this Item 7.01.

Cautionary Statement Regarding Forward-Looking Statements

This Current Report on Form 8-K contains statements which are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements, based upon management’s beliefs and expectations as well as on assumptions made by and data currently available to management, include statements regarding, among other things, Signet’s results of operation, financial condition, liquidity, prospects, growth, strategies and the industry in which Signet operates. The use of the words “expects,” “intends,” “anticipates,” “estimates,” “predicts,” “believes,” “should,” “potential,” “may,” “forecast,” “objective,” “plan,” or “target,” and other similar expressions are intended to identify forward-looking statements. These forward-looking statements are not guarantees of future performance and are subject to a number of risks and uncertainties, including but not limited to general economic conditions, risks relating to Signet being a Bermuda corporation, the merchandising, pricing and inventory policies followed by Signet, the reputation of Signet and its brands, the level of competition in the jewelry sector, the cost and availability of diamonds, gold and other precious metals, regulations relating to consumer credit, seasonality of Signet’s business, financial market risks, deterioration in consumers’ financial condition, exchange rate fluctuations, changes in consumer attitudes regarding jewelry, management of social, ethical and environmental risks, security breaches and other disruptions to Signet’s information technology infrastructure and databases, inadequacy in and disruptions to internal controls and systems, changes in assumptions used in making accounting estimates relating to items such as extended service plans and pensions.

For a discussion of these and other risks and uncertainties which could cause actual results to differ materially, see the “Risk Factors” section of Signet’s Fiscal 2014 Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission on March 27, 2014. Actual results may differ materially from those anticipated in such forward-looking statements. Signet undertakes no obligation to update or revise any forward-looking statements to reflect subsequent events or circumstances, except as required by law.

The information in this Current Report on Form 8-K is being furnished pursuant to Item 2.02 Results of Operations and Financial Condition and Item 7.01 Regulation FD Disclosure. In accordance with General Instruction B.2 of Form 8-K, the information in this report shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Exchange Act or the Securities Act of 1933, as amended, except as expressly stated by specific reference in such filing.

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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.