Exhibit 99.1

SIGNET JEWELERS REPORTS EXCELLENT FOURTH QUARTER

AND STRONG FISCAL 2015 FINANCIAL RESULTS

Signet announces its capital allocation strategy including return of capital to shareholders

HAMILTON, Bermuda, March 26, 2015 – Signet Jewelers Limited (“Signet”) (NYSE and LSE: SIG), the largest specialty retail jeweler in the US, UK and Canada, today announced its results for the 13 weeks (“fourth quarter Fiscal 2015”) and 52 weeks (“Fiscal 2015”) ended January 31, 2015. Results reflect the addition of Zale Corporation, acquired on May 29, 2014, as well as purchase accounting and transaction costs related to that acquisition.

Mark Light, Chief Executive Officer of Signet, said, “We had an outstanding finish to another strong year of growth for Signet. The disciplined execution of our focused strategies drove broad-based success across all of our divisions and store brands. For the quarter, we delivered a 4.2% increase in same store sales, EPS of $2.84, and adjusted EPS of $3.06 — an increase of 40.4%. For the year, we generated a 4.1% same store sales increase which led to EPS of $4.75 and adjusted EPS of $5.63 — an increase of 23.5%.

“In the fourth quarter, our Sterling division delivered a same store sales increase of 3.7% while delivering record operating profit. Our UK division saw its highest fourth quarter same store sales increase in 13 years at 7.5% and its best operating profit in three years. Our newest division, Zale, delivered a 3.7% increase in fourth quarter same store sales. We are making good progress on the integration of Zale into our organization and continue to see significant opportunities in front of us. Our integration efforts are expected to allow us to unlock the value of this strong, well-known national brand. We are well-positioned to meet our goal of $150 million to $175 million in cumulative 3-year synergies by the end of January 2018.”

Michele Santana, Chief Financial Officer of Signet, said, “Confidence in our business model and the strength of our free cash flow enables us to commit to a comprehensive capital allocation strategy that provides for sustained revenue growth together with meaningful returns to our shareholders. We will continue to target investment grade ratings and up to a 3.5-times adjusted leverage ratio. In addition, as part of our capital allocation strategy for Fiscal Year 2016, we plan to repurchase $100 million to $150 million of our stock and increase our dividend.”

Mr. Light added, “As we continue to focus on achieving our operations and integration goals we will remain thoughtful about our capital allocation strategy. We are committed to shareholder distributions and view our own stock as an attractive investment opportunity.”

He continued, “I want to congratulate and thank all Signet team members for a fantastic fiscal year and fourth quarter. Their dedication, passion, and collaboration delivered significant value for Signet shareholders and position our Company for growth in the future.”

Fourth Quarter Fiscal 2015 Diluted Earnings per Share (“EPS”) Analysis:

Fourth quarter EPS was $2.84. Fourth quarter adjusted EPS was $3.06. Adjusted EPS can be reconciled to EPS as follows:

Fourth quarter adjusted EPS was $3.06. On a comparable basis to fourth quarter Fiscal 2014, EPS was $2.53. A reconciliation is as follows:

EPS on a comparable basis increased 16.1% compared to fourth quarter Fiscal 2014 EPS of $2.18.

Capital Strategy:

The Company expects to maintain a strong balance sheet that provides the flexibility to execute its strategic priorities, invest in its business, and return excess cash to shareholders while ensuring adequate liquidity. Signet is committed to

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maintaining its investment grade rating because long-term, it intends to pursue value-enhancing strategic growth initiatives. Among the key tenets of Signet’s capital strategy:

1. Adjusted debt, adjusted EBITDAR, and free cash flow are non-GAAP measures. Signet believes they are useful measures to provide insight into how the Company intends to use capital. See reconciliation schedules.

Financial Guidance:

Signet is providing guidance for the 13 weeks ended May 2, 2015 (“first quarter Fiscal 2016”) and a framework for its full year expectations.

Net selling square footage growth is expected to be driven by the following projected store (and kiosk) changes:

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Fourth Quarter Fiscal 2015 Sales Highlights:

Total sales were $2,276.4 million, up $712.4 million or 45.5%, compared to $1,564.0 million in the fourth quarter Fiscal 2014. The increase was primarily driven by the addition of the Zale division which added $636.7 million of sales to fourth quarter Fiscal 2015. Same store sales increased 4.2% compared to an increase of 4.3% in the fourth quarter Fiscal 2014. eCommerce sales were $149.6 million compared to $79.0 million in the fourth quarter Fiscal 2014, up $70.6 million or 89.4%, also due principally to the addition of Zale which added $54.8 million in eCommerce sales.

Sales change from previous year

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Fourth Quarter Fiscal 2015 Financial Highlights:

Gross margin was $912.1 million or 40.1% of sales compared to $648.8 million or 41.5% of sales in the fourth quarter Fiscal 2014. Adjusted gross margin was $936.9 million or 40.9% of adjusted sales. The decrease in the adjusted gross margin rate from prior year of 60 basis points was attributable to the addition this year of Zale. Zale, which reduced Signet’s adjusted gross margin rate by 110 basis points, operates with a lower gross margin structure than the Sterling division and represents an area for improvement. The adjusted Signet gross margin rate excluding Zale would have been 42.0%. The Signet adjusted gross margin rate decrease was partially offset by a higher gross margin rate in the Sterling division of 70 basis points, primarily due to merchandise margin factors such as lower commodity costs.

Selling, general and administrative expenses (“SGA”) were $634.5 million or 27.9% of sales compared to $425.8 million or 27.2% of sales in the fourth quarter Fiscal 2014. The $208.7 million SGA increase was primarily due to the addition of the Zale division this year. The increase was also due to transaction costs of $9.2 million partially offset by a reduction of $4.0 million from purchase accounting adjustments. Adjusted SGA was $629.3 million or 27.5% of adjusted sales. The 30 basis point increase in the adjusted SGA rate compared to the fourth quarter Fiscal 2014 rate was driven by the Zale division, which unfavorably affected SGA rate by 70 basis points. The adjusted Signet SGA rate excluding Zale would have been 26.8%.

Other operating income was $54.1 million compared to $47.6 million in the prior year fourth quarter, up $6.5 million or 13.7%. This increase was due to the Sterling division’s higher interest income earned from higher outstanding receivable balances.

Operating income was $331.7 million, or 14.6% of sales, compared to $270.6 million, or 17.3% of sales, in the fourth quarter Fiscal 2014. Adjusted operating income was $361.7 million, or 15.8% of sales, down 150 basis points versus prior year due to the addition this year of Zale. The Zale division operating income was $56.9 million, or 8.7% of sales. Excluding the Zale division, the adjusted Signet operating margin would have been 18.6%.

The Sterling and UK divisions delivered fourth quarter operating margins of 19.1% and 19.4%, respectively, which were higher than the previous fourth quarter by 140 and 40 basis points.

Net interest expense was $7.9 million compared to $1.2 million in the prior year fourth quarter. The increase in interest expense was driven primarily by the addition of $1.4 billion of financing related to the Zale acquisition.

Income tax expense was $95.8 million, an effective tax rate (“ETR”) of 29.6%, compared to $94.2 million, an ETR of 35.0%, in the prior year fourth quarter. This year’s lower ETR reflects the benefit of Signet’s amended capital structure and the global financing arrangements utilized to fund the acquisition of Zale.

Balance Sheet and Other Highlights at January 31, 2015:

Cash and cash equivalents were $193.6 million compared to $247.6 million as of February 1, 2014. The lower cash position was due to unfavorable changes to working capital, higher capital spending, higher dividends, and the financing of the Zale acquisition.

For the year, Signet repurchased 288,393 shares at an average cost of $103.37 per share. As of January 31, 2015, there was $265.6 million remaining under Signet’s 2013 share repurchase authorization program.

Net accounts receivable were $1,567.6 million, up 14.1% compared to $1,374.0 million as of February 1, 2014. In the Sterling Jewelers division the credit participation rate was 60.5% in the 52 weeks ended January 31, 2015 compared to 57.7% in the 52 weeks ended February 2, 2014.

Net inventories were $2,439.0 million, up 63.9% compared to $1,488.0 million as of the prior year period. The increase was due to the acquisition of the Zale division, which had inventories of $917.6 million at the end of Fiscal 2015. The increase was also driven in part by new stores in the Sterling division.

Long term debt was $1.4 billion compared to $0.0 as of the prior year period due to the financing of the Zale acquisition.

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On January 31, 2015, Signet had 3,579 stores, consisting of the following:

Dividends:

Reflecting the Board’s confidence in the strength of the business, the Company’s ability to invest in growth initiatives, and the Board’s commitment to building long-term shareholder value, a 22% increase in the quarterly cash dividend from $0.18 to $0.22 per Signet Common Share has been declared for the first quarter of Fiscal 2016 payable on May 27, 2015 to shareholders of record on May 1, 2015, with an ex-dividend date of April 30, 2015.

Conference Call:

A conference call is scheduled today at 8:30 a.m. ET and a simultaneous audio webcast and slide presentation are available at www.signetjewelers.com. The slides are available to be downloaded from the website ahead of the conference call. The call details are:

A replay and transcript of the call will be posted on Signet’s website as soon as they are available and will be accessible for one year.

About Signet and Safe Harbor Statement:

Signet Jewelers Limited is the largest specialty jewelry retailer in the US, UK and Canada. Signet operates approximately 3,600 stores primarily under the name brands of Kay Jewelers, Zales, Jared The Galleria Of Jewelry, H.Samuel, Ernest Jones, Peoples and Piercing Pagoda. Further information on Signet is available at www.signetjewelers.com. See also www.kay.com, www.zales.com, www.jared.com, www.hsamuel.co.uk, www.ernestjones.co.uk, www.peoplesjewellers.com and www.pagoda.com.

This release 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

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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 customer credit, seasonality of Signet’s business, financial market risks, deterioration in customers’ financial condition, exchange rate fluctuations, changes in Signet’s credit rating, 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, the impact of the acquisition of Zale Corporation on relationships, including with employees, suppliers, customers and competitors, the impact of stockholder litigation with respect to the acquisition of Zale Corporation, and our ability to successfully integrate Zale’s operations and to realize synergies from the transaction.

For a discussion of these and other risks and uncertainties which could cause actual results to differ materially from those expressed in any forward-looking statement, see the “Risk Factors” section of Signet’s Fiscal 2015 Annual Report on Form 10-K filed with the SEC on March 26, 2015. Signet undertakes no obligation to update or revise any forward-looking statements to reflect subsequent events or circumstances, except as required by law.

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The Company uses adjusted metrics, which adjust for purchase accounting and transaction costs related to the Zale acquisition and the contribution of the Zale division to give investors information as to the Company’s results without regard to the expenses associated with the May 2014 acquisition of Zale Corporation. Signet is furnishing the following schedules in order to provide further visibility into the components of Adjusted Signet results until those results anniversary in third quarter Fiscal 2016.

Non-GAAP Reconciliation for the fourth quarter ended January 31, 2015 (in mil. of $ except per share data)

Additional schedule for the fourth quarter ended January 31, 2015 ($ in mil. except per share data)

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The Company uses adjusted metrics, which adjust for purchase accounting, severance and transaction costs principally in relation to the Zale acquisition to give investors information as to the Company’s results without regard to the expenses associated with the May 2014 acquisition of Zale Corporation and certain severance costs as described in Note 3 below. Signet is furnishing the following schedules in order to provide annual visibility into the components of Adjusted Signet results. These schedules are based solely upon actual Signet results and gives no pro-forma consideration to Zale prior to its acquisition.

Non-GAAP Reconciliation for the 52 weeks ended January 31, 2015 (in mil. of $ except per share data)

Additional schedule for the 52 weeks ended January 31, 2015 ($ in mil. except per share data)

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The leverage ratio and free cash flow are non-GAAP measures. The leverage ratio is calculated by dividing adjusted debt by adjusted EBITDAR. Adjusted debt is a non-GAAP measure defined as debt recorded in the consolidated balance sheet, plus an adjustment for operating leases (8x annual rent expense), less 70% of outstanding in-house finance receivables recorded in the consolidated balance sheet. Adjusted EBITDAR is a non-GAAP measure defined as earnings before interest and income taxes, depreciation and amortization, and non-cash acquisition-related accounting adjustments. It further excludes rent expense for operating leases, non-cash share-based compensation expense, and income earned on receivable balances related to the in-house credit program. Free cash flow equals net cash provided by operating activities less property, plant and equipment net. Management believes these financial measures are helpful to enhance investors’ ability to understand and analyze the Company’s capital structure.

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Condensed Consolidated Income Statements

(Unaudited)

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Condensed Consolidated Balance Sheets

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Condensed Consolidated Statements of Cash Flows

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