Exhibit 99.1

Box Announces Strong Second Quarter Fiscal 2016 Results

Surpassed 50,000 customers globally

LOS ALTOS, Calif. – September 9, 2015 – Box, Inc. [NYSE: BOX], the leading enterprise content management and collaboration platform, today announced financial results for the second quarter of fiscal 2016, which ended July 31, 2015. During the quarter, Box surpassed 50,000 customers globally, adding or expanding deployments with thousands of companies, including Airbnb, Alcoa, Cushman & Wakefield, Lionsgate, Limited Brands, Uber, and IBM.

“We delivered another strong quarter with year over year revenue growth of 43% and billings growth of 45% driven by new and expanding customer deployments,” said Aaron Levie, co-founder and CEO of Box. “We continue to invest in our core platform while adding new products like Enterprise Key Management and Governance that augment our ability to capture demand in the broader enterprise content management market. Later this month at BoxWorks, we’ll announce several more innovations and showcase how our customers are leveraging Box to transform their businesses.”

“We continued to execute on our path to profitability by delivering improved non-GAAP operating margin,” said Dylan Smith, co-founder and CFO of Box. “While we continue to invest in our large market opportunity and solidify our leadership position, our business model allows us to drive gains in operational efficiency as we scale.”

Fiscal Second Quarter Financial Highlights

Business Highlights (through July 31, 2015, unless otherwise noted)

Outlook

All forward-looking non-GAAP financial measures contained in this section “Outlook” exclude estimates for stock-based compensation expense, intangible assets amortization and, as applicable, other special items. While a reconciliation of non-GAAP guidance measures to corresponding GAAP measures is not available on a forward-looking basis, Box has provided a reconciliation of GAAP to non-GAAP financial measures in the financial statement tables for its second quarter fiscal 2016 non-GAAP results included in this press release.

Webcast and Conference Call Information

Box’s management team will host a conference call today beginning at 2:00 PM (PT) / 5:00 PM (ET) to discuss Box’s financial results and business highlights. A live audio webcast of Box’s second quarter fiscal 2016 earnings call will be available through Box’s Investor Relations website at www.box.com/investors and will be archived for a period of 90 days.

The access details for the live conference call are:

+ 1-877-876-9177 (U.S. and Canada), conference ID: BOXQ216

+ 1-785-424-1666 (international), conference ID: BOXQ216

A telephonic replay of the call will be available approximately two hours after the call and will run for one week. The replay can be accessed by dialing:

+ 1-800-723-0479 (U.S. and Canada)

+ 1-402-220-2650 (international)

Box has used, and intends to continue to use, its Investor Relations website (www.box.com/investors), as well as certain Twitter accounts (@boxhq, @levie and @boxincir), as means of disclosing material non-public information and for complying with its disclosure obligations under Regulation FD.

This press release, the financial tables, as well as other supplemental information including the reconciliations of certain non-GAAP measures to their nearest comparable GAAP measures, are also available on Box’s Investor Relations website. Box also provides investor information, including news and commentary about Box’s business and financial performance, Box’s filings with the Securities and Exchange Commission, notices of investor events and Box’s press and earnings releases, on Box’s Investor Relations website.

Forward-Looking Statements

This press release contains forward-looking statements that involve risks and uncertainties, including statements regarding Box’s future profitability, cash flow, planned investments, planned product enhancements, as well as revenue, non-GAAP operating margin and weighted average diluted outstanding share count expectations for Box’s third fiscal quarter and fiscal year 2016 in the paragraphs under “Outlook” above. There are a significant number of factors that could cause actual results to differ materially from statements made in this press release, including: (1) adverse changes in general economic or market conditions; (2) delays or reductions in information technology spending; (3) factors related to Box’s intensely competitive market, including but not limited to pricing pressures, industry consolidation, entry of new competitors and new applications and marketing initiatives by Box’s current or future competitors; (4) the development of the cloud-based Enterprise Content Management market; (5) risks associated with Box’s ability to manage its rapid growth effectively; (6) Box’s limited operating history, which makes it difficult to predict future results; (7) the risk that Box’s customers do not renew their subscriptions or expand their use of Box’s services; (8) Box’s ability to provide successful enhancements, new features and modifications to its services; and (9) actual or perceived security vulnerabilities in Box’s services or any beaches of Box’s security controls.

Additional information on potential factors that could affect Box’s financial results is included in the reports on Forms 10-K, 10-Q and 8-K and in other filings Box makes with the Securities and Exchange Commission from time to time, including the Quarterly Report on Form 10-Q filed for the fiscal quarter ended April 30, 2015. These documents are available on the SEC Filings section of Box’s investor relations website located at www.box.com/investors. Box does not assume any obligation to update the forward-looking statements contained in this press release to reflect events that occur or circumstances that exist after the date on which they were made.

About Non-GAAP Financial Measures

To supplement Box’s consolidated financial statements, which are prepared and presented in accordance with GAAP, Box provides investors with certain non-GAAP financial measures, including non-GAAP operating loss, non-GAAP operating margin, non-GAAP net loss, non-GAAP net loss attributable to common stockholders, non-GAAP net loss per share attributable to common stockholders and billings (collectively, the “non-GAAP financial measures”). The presentation of non-GAAP financial measures is not intended to be considered in isolation or as a substitute for, or superior to, the financial information prepared and presented in accordance with GAAP. For more information on these non-GAAP financial measures, please see the tables captioned “Reconciliation of GAAP to non-GAAP data” which are included at the end of this release.

Box uses these non-GAAP financial measures for financial and operational decision-making and as a means to evaluate period-to-period comparisons. Box’s management believes that these non-GAAP financial measures provide meaningful supplemental information regarding Box’s performance by excluding certain expenses that may not be indicative of Box’s recurring core business operating results. Box believes that both management and investors benefit from referring to these non-GAAP financial measures in assessing Box’s performance and when planning, forecasting, and analyzing future periods. These non-GAAP financial measures also facilitate management’s internal comparisons to Box’s historical performance as well as comparisons to Box’s competitors’ operating results. Box believes these non-GAAP financial measures are useful to investors both because (1) they allow for greater transparency with respect to key metrics used by management in its financial and operational decision-making and (2) they are used by Box’s institutional investors and the analyst community to help them analyze the health of Box’s business.

Non-GAAP operating loss and operating margin. Box defines non-GAAP operating loss as operating loss excluding expenses related to stock-based compensation (SBC), intangible assets amortization, and as applicable, other special items. Non-GAAP operating margin is defined as non-GAAP operating loss divided by revenue. Although stock-based compensation is an important aspect of the compensation of Box’s

employees and executives, determining the fair value of certain of the stock-based instruments Box utilizes involves a high degree of judgment and estimation and the expense recorded may bear little resemblance to the actual value realized upon the vesting or future exercise of the related stock-based awards. Furthermore, unlike cash compensation, the value of stock options, which is an element of Box’s ongoing stock-based compensation expense, is determined using a complex formula that incorporates factors, such as market volatility, that are beyond Box’s control. For restricted stock unit awards, the amount of stock-based compensation expenses is not reflective of the value ultimately received by the grant recipients. Management believes it is useful to exclude stock-based compensation in order to better understand the long-term performance of Box’s core business and to facilitate comparison of Box’s results to those of peer companies. Management also views amortization of acquisition-related intangible assets, such as the amortization of the cost associated with an acquired company’s research and development efforts, trade names and customer relationships, as items arising from pre-acquisition activities determined at the time of an acquisition. While these intangible assets are continually evaluated for impairment, amortization of the cost of purchased intangibles is a static expense, one that is not typically affected by operations during any particular period. Box further excludes legal verdict amounts because they are considered by management to be special items outside Box’s core operating results.

Non-GAAP net loss, net loss attributable to common stock holders, and net loss per share attributable to common stockholders. Box defines non-GAAP net loss as net loss excluding expenses related to SBC, intangible assets amortization, remeasurement of redeemable convertible preferred stock warrant liability, and as applicable, other special items. Box defines non-GAAP net loss attributable to common stockholders as net loss attributable to common stockholders excluding expenses related to SBC, intangible assets amortization, remeasurement of redeemable convertible preferred stock warrant liability, accretion of redeemable convertible preferred stock, deemed dividend on the conversion of Series F redeemable convertible preferred stock, and as applicable, other special items. Box defines non-GAAP net loss per share attributable to common stockholders as non-GAAP net loss attributable to common stockholders divided by the weighted average outstanding shares. Box excludes remeasurement of redeemable convertible preferred stock warrant liability, accretion of redeemable convertible preferred stock, deemed dividend on the conversion of Series F redeemable convertible preferred stock, and as applicable, other special items because they are considered by management to be outside Box’s core operating results.

The accompanying tables have more details on the non-GAAP financial measures that are most directly comparable to GAAP financial measures and the related reconciliations between these financial measures.

About Box

Founded in 2005, Box [NYSE:BOX] is transforming the way people and organizations work so they can achieve their greatest ambitions. As the world’s the leading enterprise content management and collaboration platform, Box helps businesses of all sizes in every industry securely access and manage their critical information in the cloud. Box is headquartered in Los Altos, CA, with offices across the United States, Europe and Asia. To learn more about Box, visit www.box.com.

Contacts

Media:

Denis Roy, Box

+1 650-543-6926

press@box.com

Investors:

Alice Kousoum Lopatto, Box

+1 650-209-3467

ir@box.com

BOX, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

BOX, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

(unaudited)

BOX, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(unaudited)

BOX, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)

(In thousands)

(unaudited)

BOX, INC.

RECONCILIATION OF GAAP TO NON-GAAP DATA

(In thousands, except per share data)

(unaudited)

BOX, INC.

RECONCILIATION OF GAAP TO NON-GAAP DATA (CONTINUED)

(In thousands, except per share data)

(unaudited)

BOX, INC.

RECONCILIATION OF GAAP REVENUE TO BILLINGS

(In thousands)

(unaudited)