Press Release

Rosetta Stone Inc. Announces the Closing of its Initial Public Offering

2009 April, 21

Underwriters Exercise Over-Allotment Option

Rosetta Stone Inc. (NYSE:RST) today announced that it had closed its previously announced initial public offering of 6,250,000 shares of its common stock at an initial public offering price of $18.00 per share. Rosetta Stone sold 3,125,000 shares of its common stock and selling stockholders sold the remaining 3,125,000 shares in the offering. Further, the underwriters of the offering fully exercised their over-allotment option and purchased 937,500 additional shares of common stock from the selling stockholders.

Morgan Stanley & Co. Incorporated and William Blair & Company, L.L.C. acted as joint book-running managers for the offering. Jefferies & Company, Inc., Piper Jaffray & Co. and Robert W. Baird & Co. Incorporated were the co-managers of the offering. A copy of the final prospectus may be obtained from either:

Morgan Stanley & Co. Incorporated, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York, 10014, telephone (866) 718-1649, or by e-mailing prospectus@morganstanley.com; or William Blair & Company, L.L.C., Attention: Prospectus Department, 222 West Adams, Chicago, Illinois 60606, telephone (800) 621-0687.

About Rosetta Stone Inc.

Rosetta Stone Inc. is a leading provider of technology-based language learning solutions consisting of software, online services and audio practice tools, primarily under the Rosetta Stone brand. Rosetta Stone offers its self-study language learning solutions in 31 languages. Its customers include individuals, educational institutions, armed forces, government agencies and corporations. For more information, visit www.RosettaStone.co.uk

Rosetta Stone Inc.

Investor Contact:

Christopher Martin, +1 703 387 5927

cmartin@rosettastone.com

Media Contact:

Rebecca Barr, +44 (0) 207 492 9000

rbarr@rosettastone.com