Exhibit 99.1

Riverbed Technology Reports Record Revenue for Third Quarter Fiscal 2011

Riverbed Technology (NASDAQ:RVBD), the IT performance company, today reported financial results for its third quarter ended September 30, 2011 (Q3’11).

Reporting on a GAAP basis, revenue for Q3’11 was $190 million, an increase of 28% from $148 million of GAAP revenue reported in the third quarter of fiscal year 2010 (Q3’10). Non-GAAP revenue increased 29% to $191 million.

GAAP net income for Q3’11 was $19 million, or $0.12 per share. This compares to GAAP net income of $14 million, or $0.09 per diluted share, in Q3’10. Non-GAAP net income for Q3’11 was $40 million, or $0.24 per diluted share, as compared to non-GAAP net income for Q3’10 of $27 million, or $0.17 per diluted share.

“We are very pleased with our third quarter financial results,” said Jerry M. Kennelly, Riverbed^® president and CEO. “We were able to generate record revenue and strong sequential and year-over-year growth against the backdrop of an uncertain global economy. We achieved record non-GAAP operating margin of 30% and record non-GAAP net income of $40 million during a quarter in which we closed two acquisitions. Riverbed has evolved into a company that delivers a performance platform to dramatically improve IT. Our market position is stronger than ever and we are excited about the opportunity before us.”

“Our third quarter results underscore the compelling value Riverbed delivers to customers and the strength of our operating model and balance sheet,” said Randy S. Gottfried, Riverbed chief financial officer. “During the third quarter we generated $90 million in cash flow from operations. We exited the period with $559 million in cash and investments after repurchasing $20 million of Riverbed shares and paying out $120 million for acquisitions.”

Q3’11 Financial Highlights

Q3’11 Business Highlights

Conference Call

Riverbed will host a conference call today, October 19, 2011, at 1:30 p.m. Pacific Time (4:30 p.m. Eastern Time) to discuss its third quarter 2011 results and outlook for the fourth quarter of 2011. The call will be broadcast live over the Internet at www.riverbed.com/investors. A replay of the conference call will also be available via webcast for 12 months.

Use of Non-GAAP Financial Information

To supplement our financial results presented in accordance with Generally Accepted Accounting Principles (GAAP), this press release and the accompanying tables and the related earnings conference call contain certain non-GAAP financial measures, including non-GAAP revenue, non-GAAP operating profit, non-GAAP operating margin, non-GAAP net income, non-GAAP gross margin and non-GAAP operating margin, that we believe are helpful in understanding our past financial performance and future results. For reconciliations of these non-GAAP financial measures to the most directly comparable GAAP financial measures, please see the section of the accompanying tables titled, “GAAP to Non-GAAP Reconciliations.” Our non-GAAP financial measures are not meant to be considered in isolation or as a substitute for comparable GAAP measures and should be read in conjunction with our consolidated financial statements

prepared in accordance with GAAP. Our management regularly uses our supplemental non-GAAP financial measures internally to understand and manage our business and forecast future periods. Our non-GAAP financial measures include adjustments based on the following items, as well as the related income tax effects, adjustments related to our tax valuation allowance and the interim tax cost of the one-time transfer of intellectual property rights between Riverbed legal entities:

Support deferred revenue: Business combination accounting rules require us to account for the fair value of support contracts assumed in connection with our acquisitions. The book value of the acquisition deferred support revenue was reduced by $4 million in the adjustment to fair value. Because these are typically one-year contracts, our GAAP revenues for an one year period subsequent to the acquisition of a business do not reflect the full amount of service revenues on assumed support contracts that would have otherwise been recorded by the acquired entity. The non-GAAP adjustment is intended to reflect the full amount of such revenues. We believe this adjustment is useful to investors as a measure of the ongoing performance of our business because we have historically experienced high renewal rates on support contracts, although we cannot be certain that customers will renew these contracts.

Stock-based compensation expenses: We have excluded the effect of stock-based compensation and related payroll tax expenses from our non-GAAP operating expenses and net income measures. Although stock-based compensation is a key incentive offered to our employees, we continue to evaluate our business performance excluding stock-based compensation expenses. Stock-based compensation expenses will recur in future periods.

Amortization of intangible assets: We have excluded the effect of amortization of intangible assets from our non-GAAP net income. Amortization of intangible assets is a non-cash expense, and it is not part of our core operations. Investors should note that the use of intangible assets contributed to revenues earned during the periods presented and will contribute to future period revenues as well.

Acquisition related and other expenses: We incur significant expenses in connection with our acquisitions and also incurred certain other operating expenses, which we would not have otherwise incurred in the periods presented as a part of our continuing operations. Acquisition related and other expenses consist of transaction costs, costs for transitional employees, other acquired employee related retention costs, integration related professional services, adjustments to the fair value of the acquisition related contingent consideration and foreign exchange losses on the acquisition related contingent consideration. We believe it is useful for investors to understand the effects of these items on our total operating expenses.

Forward-Looking Statements

This press release contains forward-looking statements, including statements relating to expected future growth. These forward-looking statements involve risks and uncertainties, as well as assumptions that, if they do not fully materialize or prove

incorrect, could cause our results to differ materially from those expressed or implied by such forward-looking statements. The risks and uncertainties that could cause our results to differ materially from those expressed or implied by such forward-looking statements include our ability to react to trends and challenges in our business and the markets in which we operate; our ability to anticipate market needs or develop new or enhanced products to meet those needs; the adoption rate of our products; our ability to establish and maintain successful relationships with our distribution partners; our ability to compete in our industry; fluctuations in demand, sales cycles and prices for our products and services; shortages or price fluctuations in our supply chain; our ability to protect our intellectual property rights; general political, economic and market conditions and events; difficulties encountered in integrating new or acquired businesses and technologies; the inability to identify and realize the anticipated benefits of acquisitions; the expense and impact of legal proceedings; and other risks and uncertainties described more fully in our documents filed with or furnished to the Securities and Exchange Commission. More information about these and other risks that may impact Riverbed’s business are set forth in our Form 10-K filed with the SEC for the period ended December 31, 2010, and our subsequent Forms 10-Q filed with the SEC. All forward-looking statements in this press release are based on information available to us as of the date hereof, and we assume no obligation to update these forward-looking statements. Any future product, feature or related specification that may be referenced in this release are for information purposes only and are not commitments to deliver any technology or enhancement. Riverbed reserves the right to modify future product plans at any time.

About Riverbed

Riverbed delivers performance for the globally connected enterprise. With Riverbed, enterprises can successfully and intelligently implement strategic initiatives such as virtualization, consolidation, cloud computing, and disaster recovery without fear of compromising performance. By giving enterprises the platform they need to understand, optimize and consolidate their IT, Riverbed helps enterprises to build a fast, fluid and dynamic IT architecture that aligns with the business needs of the organization.

Riverbed and any Riverbed product or service name or logo used herein are trademarks of Riverbed Technology, Inc. All other trademarks used herein belong to their respective owners.

INVESTOR RELATIONS CONTACT

Renee Lyall

Riverbed Technology

415-247-6353

renee.lyall@riverbed.com

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Riverbed Technology, Inc.

GAAP Condensed Consolidated Statements of Operations

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Condensed Consolidated Balance Sheets

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Supplemental Financial Information

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GAAP to Non-GAAP Reconciliation

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