Exhibit 99.1

Hortonworks Reports Financial Results for Fourth Quarter and Fiscal Year 2014

SANTA CLARA, Calif.—February 24, 2015—Hortonworks^® (NASDAQ: HDP), the leading contributor to and provider of enterprise Apache™ Hadoop^®, today announced financial results for the fourth quarter and fiscal year 2014.

“We are very pleased with our strong fourth quarter performance highlighted by billings growth of 148% year-over-year,” said Rob Bearden, chairman of the board of directors and chief executive officer, Hortonworks. “The completion of our initial public offering was an important milestone for us as it brought increased transparency, greater brand awareness and incremental resources to execute our growth strategy. Leading enterprise organizations have concluded that YARN-enabled Hadoop is foundational to their modern data architecture and the Hortonworks Data Platform is rapidly becoming the de facto standard to unlock business insight by bringing the new paradigm of data under management.”

Fourth quarter 2014 financial highlights:

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“We added 99 support subscription customers in Q4, bringing our cumulative total support subscription customer count to 332, including many of the largest and most respected companies in the world, while investing to build out key elements of our company to position us for future growth,” noted Rob Bearden. “We exited December 31, 2014 with total headcount of 601. Lastly, our quarterly average dollar-based net expansion rate was 144% for the trailing four quarters.”

Fiscal year 2014 financial highlights:

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The comparative 12-month period for the year ended December 31, 2013 is derived from quarterly financial information disclosed in our Prospectus/Registration Statement filed on Form S-1 and declared effective on December 11, 2014. A reconciliation of GAAP to non-GAAP financial measures has been provided in the financial statement tables included in this press release.

Recent Business Highlights

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Financial Outlook

As of February 24, 2015, Hortonworks is providing the following non-GAAP financial outlook for its first quarter and full year 2015 (negative numbers are shown in parentheses):

For the first quarter of 2015, we expect:

For the full year 2015, we expect:

Fourth Quarter and Fiscal Year 2014 Earnings Conference Call and Webcast Details

Hortonworks will hold a conference call and webcast to discuss the results and outlook at 1:30 p.m. Pacific Time (4:30 p.m. Eastern Time) today, Tuesday, February 24, 2015. Interested parties may access the call by dialing (877) 930-7786 in the U.S. or (253) 336-7423 from international locations. In addition, a live audio webcast of the conference call will be available on the Hortonworks Investor Relations website at http://investors.hortonworks.com.

Shortly after the conclusion of the conference call, a replay of the audio webcast will be available on the Hortonworks Investor Relations website for approximately seven days.

Statement regarding use of non-GAAP financial measures

The company reports non-GAAP results for revenue, gross margins, operating margins, net income or loss, basic and diluted income or loss per share, adjusted EBITDA and billings in addition to, and not as a substitute for, or superior to, financial measures calculated in accordance with GAAP.

The company’s financial measures under GAAP include stock-based compensation expense, facilities exit costs, 2014 Yahoo! Common Stock Warrant (with a fair value of $5.4 million as of the initial public offering), 2011 Yahoo! Warrant (convertible to common stock and having a fair value of $52.0 million as of the initial public offering), AT&T Contra-revenue, tax benefit related to XA acquisition, other, contribution of developed technology, and a legal settlement. Management believes the presentation of operating results that exclude these items provides useful supplemental information to investors and facilitates the analysis of the company’s core operating results and comparison of operating results across reporting periods. Management also believes that this supplemental non-GAAP information is therefore useful to investors in analyzing and assessing the company’s past and future operating performance.

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Billings are calculated as non-GAAP revenue plus the quarterly sequential change in total deferred revenue. Management believes billings offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Adjusted EBITDA is calculated as billings minus total non-GAAP expenses which includes all non-GAAP expenses associated with cost of revenue and operating expenses. Management believes Adjusted EBITDA offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Non-GAAP revenue is calculated as GAAP revenue plus the non-GAAP contra-revenue adjustments associated with the 2011 Yahoo! Warrant and AT&T relationship. Management believes non-GAAP revenue offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Non-GAAP gross margin is calculated as non-GAAP gross profit divided by non-GAAP revenue. Management believes non-GAAP gross margin offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Non-GAAP operating margin is calculated as non-GAAP operating loss divided by non-GAAP revenue. Management believes non-GAAP operating margin offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Non-GAAP net loss is calculated as non-GAAP revenue minus total non-GAAP expenses plus interest and other income plus other income (expense) minus income tax expense (benefit). Management believes non-GAAP net loss offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Non-GAAP net loss per basic and diluted share is calculated as non-GAAP net loss divided by the weighted average shares outstanding for the period. Management believes non-GAAP net loss per basic and diluted share offers investors useful supplemental information regarding the performance of our business, and will help investors better understand its business.

Use of forward-looking statements

This release contains “forward-looking statements” regarding our performance, including in the section entitled “Financial Outlook.” Forward-looking statements are subject to known and unknown risks and uncertainties and are based on potentially inaccurate assumptions that could cause actual results to differ materially from those expected or implied by the forward-looking statements. If any such risks or uncertainties materialize or if any of the assumptions prove incorrect, our results could differ materially from the results expressed or implied by the forward-looking statements we make.

The important factors that could cause actual results to differ materially from those in any forward-looking statements include, but are not limited to, the following: (i) we have a history of losses, and we may not become profitable in the future, (ii) we have a limited operating history, which makes it difficult to predict our future

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results of operations, and (iii) we do not have an adequate history with our support subscription offerings or pricing models to accurately predict the long-term rate of support subscription customer renewals or adoption, or the impact these renewals and adoption will have on our revenues or results of operations.

Further information on these and other factors that could affect our financial results and the forward-looking statements in this press release are included in our Form S-1 effective December 11, 2014 and in other filings we make with the Securities Exchange Commission from time to time, particularly under the caption Risk Factors.

We undertake no obligation, and do not intend, to update these forward-looking statements.

About Hortonworks

Hortonworks develops, distributes and supports the only 100% open source Apache Hadoop data platform. Our team comprises the largest contingent of builders and architects within the Hadoop ecosystem who represent and lead the broader enterprise requirements within these communities.

The Hortonworks Data Platform provides an open platform that deeply integrates with existing IT investments and upon which enterprises can build and deploy Hadoop-based applications.

Hortonworks has deep relationships with the key strategic data center partners that enable our customers to unlock the broadest opportunities from Hadoop.

For more information, visit www.hortonworks.com.

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Hortonworks, Inc.

Condensed Consolidated Statement of Operations

(in thousands, except share and per share data)

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Hortonworks, Inc.

Consolidated Balance Sheets

(in thousands, except share and per share data)

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Hortonworks, Inc.

Consolidated Statements of Cash Flows

(In thousands)

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Reconciliation of GAAP to Non-GAAP

(in thousands, except per share amounts)

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Supplemental Information

For the Twelve Months Ended December 31, 2014

(in thousands)

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Supplemental Information

For the Twelve Months Ended December 31, 2013

(in thousands)

12

Supplemental Information

For the Three Months Ended December 31, 2014

(in thousands)

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Supplemental Information

For the Three Months Ended December 31, 2013

(in thousands)

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For Additional Information Contact:

Brian Marshall

bmarshall@hortonworks.com

650-305-7806

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