Exhibit 99.1

SEAGATE TECHNOLOGY REPORTS FISCAL SECOND QUARTER 2014 FINANCIAL RESULTS

·      Operating cash flow of $856 million

·                  Quarter-over-quarter growth in revenue and EPS

CUPERTINO, CA — January 27, 2014 — Seagate Technology plc (NASDAQ: STX) (the “Company” or “Seagate”) today reported financial results for the second quarter of fiscal year 2014 ended December 27, 2013.  During the second quarter, the Company reported revenue of $3.53 billion, gross margin of 28.0%, net income of $428 million and diluted earnings per share of $1.24.  On a non-GAAP basis, which excludes the net impact of certain items, Seagate reported gross margin of 28.5%, net income of $455 million and diluted earnings per share of $1.32.

During the second quarter, the Company generated approximately $856 million in operating cash flow, paid cash dividends of $142 million and repurchased 33 million ordinary shares for approximately $1.5 billion. There were 328 million ordinary shares issued and outstanding as of the end of the quarter.  Cash, cash equivalents, restricted cash, and short-term investments totaled approximately $2.3 billion at the end of the quarter.

“Seagate’s results in the December quarter reflect discipline in managing the profitability of our business and strong operational execution. We continue to strategically invest in our product portfolio and enhance our vertically integrated manufacturing capabilities to effectively capitalize on the cloud, mobile and open source storage trends that are being fueled by data growth,” said Steve Luczo, Seagate’s chairman and chief executive officer. “Our cash flow was very strong this quarter, and combined with the execution of our capital allocation strategy, we are on track to meet our goal of returning 70% of our operating cash flow to shareholders this fiscal year.”

For a detailed reconciliation of GAAP to non-GAAP results, see accompanying financial tables.

Seagate has issued a Supplemental Commentary document. The Supplemental Commentary will not be read during today’s call, but is available on Seagate’s Investors website at www.seagate.com/investors.

Quarterly Cash Dividend

The Board of Directors has approved a quarterly cash dividend of $0.43 per share, which will be payable on February 24, 2014 to shareholders of record as of the close of business on February 10, 2014.  The payment of any future quarterly dividends will be at the discretion of the Board and will be dependent upon Seagate’s financial position, results of operations, available cash, cash flow, capital requirements and other factors deemed relevant by the Board.

Investor Communications

Seagate management will hold a public webcast today at 2:00 p.m. Pacific Time that can be accessed on its Investors website at www.seagate.com/investors.  During today’s webcast, the Company will provide an outlook for its third fiscal quarter of 2014, including key underlying assumptions.

Replay

A replay will be available beginning today at approximately 6:00 p.m. Pacific Time at www.seagate.com/investors.

About Seagate

Seagate is a world leader in hard disk drives and storage solutions. Learn more at www.seagate.com.

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, each as amended, including, in particular, statements about our plans, strategies and prospects and estimates of industry growth for the fiscal quarter ending March 28, 2014 and beyond. These statements identify prospective information and include words such as “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects” and similar expressions. These forward-looking statements are based on information available to the Company as of the date of this press release and are based on management’s current views and assumptions. These forward-looking statements are conditioned upon and also involve a number of known and unknown risks, uncertainties, and other factors that could cause actual results, performance or events to differ materially from those anticipated by these forward-looking statements. Such risks, uncertainties, and other factors may be beyond the Company’s control and may pose a risk to the Company’s operating and financial condition. Such risks and uncertainties include, but are not limited to: the uncertainty in global economic conditions, as consumers and businesses may defer purchases in response to tighter credit and financial news; the impact of the variable demand and adverse pricing environment for disk drives, particularly in view of current business and economic conditions; dependence on the Company’s ability to successfully qualify, manufacture and sell its disk drive products in increasing volumes on a cost-effective basis and with acceptable quality, particularly the new disk drive products with lower cost structures; the impact of competitive product announcements; possible excess industry supply with respect to particular disk drive products; and the Company’s ability to achieve projected cost savings in connection with restructuring plans. Information concerning risks, uncertainties and other factors that could cause results to differ materially from the expectations described in this press release is contained in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission on August 7, 2013 and the Quarterly Report on Form 10-Q filed with the U.S. Securities and Exchange Commission on October 29, 2013, the “Risk Factors” sections of which are incorporated into this press release by reference. These forward-looking statements should not be relied upon as representing the Company’s views as of any subsequent date and the Company undertakes no obligation to update forward-looking statements to reflect events or circumstances after the date they were made.

SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions)

(Unaudited)

The information as of June 28, 2013 was derived from the Company’s audited Consolidated Balance Sheet as of June 28, 2013.

SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In millions, except per share data)

(Unaudited)

SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

Use of non-GAAP financial information

To supplement the condensed consolidated financial statements presented in accordance with generally accepted accounting principles (GAAP), the Company provides non-GAAP measures of net income, diluted net income per share and gross margin as a percentage of revenue, which are adjusted from results based on GAAP to exclude certain expenses, gains and losses. These non-GAAP financial measures are provided to enhance the user’s overall understanding of the Company’s current financial performance and our prospects for the future. Specifically, the Company believes non-GAAP results provide useful information to both management and investors as these non-GAAP results exclude certain expenses, gains and losses that we believe are not indicative of our core operating results and because it is consistent with the financial models and estimates published by financial analysts who follow the Company.

These non-GAAP results are some of the primary measurements management uses to assess the Company’s performance, allocate resources and plan for future periods. Reported non-GAAP results should only be considered as supplemental to results prepared in accordance with GAAP, and not considered as a substitute for, or superior to, GAAP results. These non-GAAP measures may differ from the non-GAAP measures reported by other companies in our industry.

SEAGATE TECHNOLOGY PLC

ADJUSTMENTS TO GAAP NET INCOME AND DILUTED NET INCOME PER SHARE

(In millions, except per share amounts)

(Unaudited)

A   For the three and six months ended December 27, 2013, Cost of revenue on a GAAP basis totaled $2,541 million and $5,055 million, respectively, while non-GAAP Cost of revenue, which excludes the net impact of certain adjustments, was $2,524 million and $5,018 million, respectively.  The non-GAAP adjustments include amortization of intangibles and other acquisition related expenses associated with the December 2011 acquisition of Samsung Electronics Co., Ltd’s hard disk drive business (the “Samsung HDD business”) and the August 2012 acquisition of LaCie S.A. (“LaCie”).

B   For the three and six months ended December 27, 2013, Product development and Marketing and administrative expenses have been adjusted on a non-GAAP basis to exclude the impact of acquisition and integration costs associated with the Samsung HDD business and LaCie.

C  For the three and six months ended December 27, 2013, Amortization of intangibles related to our Samsung HDD business and LaCie acquisitions.

D   For the three and six months ended December 27, 2013, Restructuring and other, net, includes a restructuring charge recorded during the December 2013 quarter associated with a reduction in the work force.

E   For the three and six months ended December 27, 2013, Other expense, net, has been adjusted on a non-GAAP basis primarily to exclude the impact of a gain recognized upon the sale of certain strategic investments.

F    For the three and six months ended December 27, 2013,  Benefit from income taxes has been adjusted on a non-GAAP basis primarily to exclude the impact related to the release of valuation allowance on U.S. deferred tax assets associated with increases in the Company’s forecasted U.S. taxable income.