Exhibit 99.1

Rosetta Stone Inc. Reports First Quarter 2011 Results

·                  Revenue of $57.0 million on bookings of $55.6 million

·                  35% bookings growth from international consumers and worldwide institutional clients exceeds expectations

·                  28% decline in bookings from US consumers in line with expectations

ARLINGTON, VA — May 9, 2011 — Rosetta Stone Inc. (NYSE:RST), a leading provider of technology-based language-learning solutions, today announced financial results for the first quarter 2011 as summarized below:

(1)Definitions and reconciliations for all non-GAAP measures are provided in this press release.

“First quarter results were largely in line with our expectations,” said Tom Adams, president and chief executive officer of Rosetta Stone.  “Sales to international consumers and to worldwide institutional clients remain strong.  We are addressing the challenges in the US consumer market with segmentation initiatives that include continued testing of revised price points.  Further, we’ve elevated our marketing with emotional messaging that enhances our brand, and we’re developing an iPad delivery platform.  Our premium language-learning solution, offering live, interactive coaching by trained native speakers as well as online gaming, continues to earn great feedback from users — and we’re confident it’s the best offering on the market.”

First Quarter 2011 Operational and Financial Highlights

·                  Revenue of $57.0 million on bookings of $55.6 million:  Bookings, which records executed sales contracts received by the company, declined 9% from the first quarter of 2010 as strength in both international and institutional sales was offset by declining sales to U.S. consumers and a $3.1 million reserve related to partial price protection for retailers in the event Rosetta Stone lowers unit prices for its offering.  Initial market testing of lower price points, begun in the first quarter and continued in April and May, has demonstrated sales uplift in the areas tested, at levels more than sufficient to offset lower average net revenue per unit.

Bookings for consumer sales reflected lower units sold at higher average prices.  Rosetta Stone sold 114,200 units in the quarter, down 14% from a year earlier, at an average price of $392 each, up $1 from a year ago.  Unit volumes were significantly below trend in the first quarter as a result of US retail partners beginning the quarter with inventory above their historical levels, which more than offset higher unit volumes sold internationally. Unit sales by US retailers to their end consumers were roughly flat with first quarter 2010 levels.

·                  Increasingly diversified revenue:  Revenue from subscription sales represented 26% of total revenue for the first quarter, up from 15% a year ago.  Subscription revenue is derived primarily from institutional sales and from sales of Version 4 TOTALe to US consumers.  Rosetta Stone also sold Version 4 in Japan beginning on February 22, 2011.  Version 4 sales include both an online-subscription component and a product (software and hardware) component.  Rosetta Stone also offers some online-only subscriptions for consumers worldwide.  The mix of revenue from three primary markets, US consumer, worldwide institutional and international consumer, also continued to diversify.

2

·                  US Consumer bookings decreased 28%:  Bookings from sales to US consumers for the first quarter were $29.8 million, compared to $41.6 million a year ago.  As expected, sales to retail partners in the US were significantly below trend in the first quarter as a result of our retail partners beginning the quarter with inventory above their historical levels.  US consumer bookings and revenue for the quarter include $3.0 million of the $3.1 million reserve related to partial price protection for retailers.  The change also reflects fewer units sold, partially offset by higher average sales price per unit.  Sales to US consumers generated 54% of total bookings in the quarter, down from 69% a year ago.

·                  Worldwide Institutional bookings up 18%:  Bookings from institutions grew to $10.8 million from $9.1 million a year ago, primarily reflecting strength in the education and corporate markets, including growth in average contract size.  Institutional bookings were 19% of total bookings, compared to 15% a year ago.

·                  International Consumer bookings up 50%:  Sales to international consumers continued a strong growth trend, at $15.0 million compared to $10.0 million a year ago.  Rosetta Stone’s internal studies indicate that consumers outside the United States spend more on language-learning than their U.S. counterparts, and the company has moved to capitalize on that strong demand.  Sales to international consumers represented 27% of total bookings, up from 17% a year ago.  Bookings growth was constrained somewhat by the disasters in Japan, one of Rosetta Stone’s four current country markets.

·                  Net Income: Rosetta Stone recorded a net loss of $9.3 million for the first quarter of 2011, compared to net income of $5.0 million a year earlier.  The decline in net income reflects lower sales to US consumers, higher costs to support growth in newer international consumer markets and lower gross margin as the company implements services related to its Version 4 TOTALe online coaching and games to support successful learning.

3

·                  Operating EBITDA:  Operating EBITDA of negative $11.4 million, compared to positive $7.0 million a year ago, reflected lower bookings and a shift in mix of the business from U.S. consumers to international consumers.

·                  Cash and Short-term Investments:  Cash, cash equivalents and short-term investments were $120.8 million as of March 31, 2011, a decrease of $1.4 million from December 31, 2010.  Net cash provided by operating activities in the quarter was $0.9 million, while cash used for capital expenditures was $2.7 million.

Financial Outlook

In 2011, Rosetta Stone plans to continue to invest in long-term growth opportunities outside the United States, including the opening of an office in Brazil, the launch of Version 4 TOTALe outside the U.S., and the introduction of a conversational English solution for Asian users.  The company also plans to continue investing in its institutional sales force to capture a higher share of a significant global market.  In the US consumer market, Rosetta Stone is taking steps to reposition its business.

For the second quarter 2011, Rosetta Stone anticipates:

·                  Sales bookings of $60 to $65 million, reflecting 25-45% increased sales to international consumers, a 4-8% decline in sales to worldwide institutional clients due to timing of contract renewals, and a 5-10% decline in sales to US consumers.

·                  Revenue of $61 to $66 million.

·                  Net loss of $(9) to $(13) million, or $(0.41) to $(0.62) per diluted share, which includes a small tax expense.

·                  Operating EBITDA of negative $5 million to negative $10 million.

·                  Basic weighted-average shares outstanding of approximately 20.7 million.

·                  We are currently exploring opportunities to change terms with our retail partners in order to reduce our credit risk and obtain greater control of our inventory.  This guidance does not reflect the potential effect of any of those changes.

For the full year 2011, Rosetta Stone continues to anticipate:

·                  Growth in total bookings versus 2010.

·                  Growth of 40% to 50% in combined sales bookings from international consumers and worldwide institutional customers.

4

·                  Lower sales bookings from US consumers.

·                  Growth in total revenue versus 2010.

·                  Lower operating income and Operating EBITDA versus 2010 attributable to lower contribution from US consumer sales and continued investment in international opportunities.

·                  Positive free cash flow

Non-GAAP Financial Measures

This press release contains the non-GAAP financial measure Operating EBITDA, which differs from GAAP in that it excludes amortization primarily related to acquired intangibles and stock-based compensation expenses and includes deferred revenue.   Operating EBITDA is GAAP net income or loss plus interest expense, income tax expense, depreciation, amortization and stock-based compensation expenses plus the change in deferred revenue from the prior quarter.  An additional non-GAAP financial measure in this press release is total sales bookings, or “bookings,” which represents executed sales contracts received by the company that are either recorded immediately as revenue or as deferred revenue.  This press release also includes the non-GAAP financial measure “free cash flow,” which is cash flow from operations less cash used in purchases of property and equipment.  Management believes that these non-GAAP measures of financial results provide useful information to investors regarding certain financial and business trends relating to the company’s financial condition and results of operations. Management uses these non-GAAP measures to compare the company’s performance to that of prior periods for trend analyses, for purposes of determining executive incentive compensation, and for budgeting and planning purposes.  These measures are used in monthly financial reports prepared for management and in quarterly financial reports presented to the company’s Board of Directors.  Management believes that the use of these non-GAAP financial measures provides an additional tool for investors to use in evaluating ongoing operating results and trends and in comparing the company’s financial measures with other software companies, many of which present similar non-GAAP financial measures to investors.

Management typically excludes the amounts described above when evaluating the company’s operating performance and believes that the resulting non-GAAP measures are useful to investors and financial analysts in assessing the company’s operating performance due to the following factors:

·                  Amortization of Acquired Intangibles. Amortization costs and the related tax effects are fixed at the time of an acquisition, and then amortized over a period of several years after the acquisition and generally cannot be changed or influenced by management after the acquisition.

5

·                  Stock-based Compensation. Although stock-based compensation is an important aspect of compensation of the company’s employees and executives, stock-based compensation expense is generally fixed at the time of grant, then amortized over a period of several years after the grant of the stock-based instrument, and generally cannot be changed or influenced by management after the grant.  In addition, the impact of shares granted under these plans is considered in the company’s EPS calculation to the extent the shares are dilutive.

·                  Total Sales Bookings. Although revenue is an important aspect of measuring company performance, the company believes total sales bookings can be a valuable indicator of the company’s performance.  In September 2011, the company began to transition to a greater amount of subscription sales, which results in an increasing portion of sales being recorded as deferred revenue.

·                  Deferred Revenue. At the time a customer enters into a binding subscription agreement, the company classifies the amounts received, as well as the amounts on billed and uncollected amounts due from customers, in advance of revenue recognition as deferred revenue.  As the company transitions to a greater amount of subscription sales the company believes its GAAP earnings should be supplemented with Operating EBITDA as another indicator of the company’s operating performance.

Management does not consider these non-GAAP measures in isolation or as an alternative to financial measures determined in accordance with GAAP.  The principal limitation of these non-GAAP financial measures is that they exclude significant expenses and income that are required by GAAP to be recorded in the company’s financial statements.  In addition, they are subject to inherent limitations, because they reflect the exercise of judgments by management about which expenses and items of income are excluded from these non-GAAP financial measures and may not be calculated in the same manner as other companies’ similarly titled non-GAAP measures.

In order to compensate for these limitations, management presents its non-GAAP financial measures in connection with its GAAP results.  Rosetta Stone urges investors to review the reconciliation of its non-GAAP financial measures to the comparable GAAP financial measures, which it includes in press releases announcing earnings information, including this press release, and not to rely on any single financial measure to evaluate the company’s business.

Reconciliation tables of the most comparable GAAP financial measures to the non-GAAP measures used in this press release are included at the end of this release.

Investor Webcast

This news release and the accompanying tables should be read in conjunction with the additional content that is available on the company’s website, which includes

6

supplemental financial information as well as the link to a webcast that the company will host to discuss the first quarter 2011 financial results and its outlook for fiscal year 2011.  The webcast, available at http://investors.rosettastone.com, is scheduled for today, May 9, 2011 at 4:30 p.m. eastern time (ET).

The webcast will be available live on the Investor Relations page of the company’s website at http://investors.rosettastone.com.  Investors may also dial in to the conference line at 888-297-0370 (USA/Canada) or +1 719-457-2708 (all others).  A recorded replay of the webcast will be available on the Investor Relations page of the company’s web site, http://investors.rosettastone.com, after the live discussion.  The replay will be also be available, until May 16, 2011, via telephone at 877-870-5176 (USA/Canada) or +1-858-384-5517 (all others), with the pass code 9370087.

About Rosetta Stone

Rosetta Stone Inc. is changing the way the world learns languages.  Rosetta Stone provides interactive solutions that are acclaimed for the speed and power to unlock the natural language-learning ability in everyone.  Available in more than 30 languages, Rosetta Stone language-learning solutions are used by schools, organizations and millions of individuals in over 150 countries throughout the world.  The company was founded in 1992 on the core beliefs that learning a language should be natural and instinctive and that interactive technology can replicate and activate the immersion method powerfully for learners of any age.  The company is based in Arlington, Va. For more information, visit RosettaStone.com®.

“Rosetta Stone” and  “TOTALe” are registered trademarks of Rosetta Stone Ltd.

Cautionary Statement Regarding Forward-Looking Statements

Certain statements in this press release are forward-looking statements, including our guidance for future financial performance and operating targets and our long-term growth prospects.  In this context, forward-looking statements often address our expected future business and financial performance, and often contain words such as “project,” “believe,” “plan,” “expect,” “anticipate,” “estimate,” “intend,” “should,” “would,” “could,” “potentially,” “seek,” “may,” or “will.”  These forward-looking statements reflect the company’s current views with respect to future events and are subject to certain risks, uncertainties, and assumptions.  A number of important factors could cause actual results or events to differ materially from those indicated by such forward-looking statements, including demand for language learning software; the advantages of our products, technology, brand and business model as compared to others; our ability to maintain effective internal controls or to remediate material weaknesses; our cash needs and expectations regarding cash flow from operations; our product development plans; the impact of our Version 4 TOTALe product on our industry; the appeal and efficacy of Version 4

7

TOTALe; our expectations regarding capturing lifetime value and a broader range of market segments through such offerings; our plans regarding expansion of our marketing initiatives and sales force; our international expansion plans; our plans regarding our kiosks and retail relationships; the impact of any revisions to our pricing strategy; our ability to manage and grow our business and execute our business strategy; our financial performance; our actions to stabilize our business in the U.S. consumer market including realigning our cost structure and revitalizing our go-to-market strategy; adverse trends in general economic conditions and the other factors described more fully in the company’s filings with the U.S. Securities and Exchange Commission (SEC), including the company’s annual report on Form 10-K for the year period ended December 31, 2010, which is on file with the SEC.  The company assumes no obligation to update the information in this communication, except as otherwise required by law.  Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date hereof.

8

ROSETTA STONE INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

ROSETTA STONE INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except per share amounts)

ROSETTA STONE INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)

(unaudited)

(1)  Represents stock based compensation expense of $11 and $13 in 2011 and 2010, respectively

(2)  Represents stock based compensation expense of $246 and $164 in 2011 and 2010, respectively and amortization of intangibles expense of $13 and $14 in 2011 and 2010, respectively

(3)  Represents stock based compensation expense of $328 and $253 in 2011 and 2010, respectively and amortization of intangibles expense of $10 and zero in 2011 and 2010, respectively

(4)  Represents stock based compensation expense of $852 and $444 in 2011 and 2010, respectively

(5)  Non-GAAP tax rate of 37.5%

ROSETTA STONE INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

ROSETTA STONE INC.

Reconciliation of Net Income (loss) to Operating EBITDA

(in thousands)

(unaudited)