Business Outlook

Len Perham, CEO, and Jim Sullivan, CFO, will comment on the first quarter during the Company’s financial results conference call today, April 29, 2008, at 1:30 p.m. (PT).

First Quarter Financial Results Webcast / Conference Call

MoSys will host a conference call and webcast with investors today at 1:30 p.m. Pacific time (4:30 p.m. Eastern time) to discuss the first quarter 2008 financial results and the business outlook. Investors and other interested parties may access the call by dialing 888-680-0860 in the U.S. (617-213-4852 outside of the U.S.), and entering the passcode 47922430 at least 10 minutes prior to the start of the call. In addition, an audio webcast will be available through the MoSys Web site at http://www.mosys.com. A telephone replay will be available for 2 business days following the call at 888-286-8010 in the U.S. (617-801-6888 outside of the U.S.), passcode of 51276179.

One may also pre-register their attendance for the conference call, which will enable immediate entry into the call. To pre-register and secure your unique PIN please go to: https://www.theconferencingservice.com/prereg/key.process?key= PBFBHLHV7

(Due to its length, this URL may need to be copied/pasted into your Internet browser's address field.)

Use of Non-GAAP Financial Measures

To supplement MoSys’ consolidated financial statements presented in accordance with GAAP (U.S. Generally Accepted Accounting Principles), MoSys uses non-GAAP financial measures that exclude from the income statement the effects of stock-based compensation and the effects of certain charges related to acquired intangible assets and other acquisition-related charges from its acquisition of the analog/mixed-signal design teams and their extensive related design know-how from Atmel Corporation in 2007. MoSys’ management believes that the presentation of these non-GAAP financial measures is useful to investors and other interested persons because they are one of the primary indicators that MoSys’ management uses for planning and forecasting future performance. Mosys believes that the presentation of non-GAAP financial measures that exclude these items is useful to investors because Mosys does not consider these charges part of the day-to-day business or reflective of the core operational activities of the Company that are within the control of management or that would be used to evaluate management’s operating performance.

Investors are encouraged to review the reconciliation of these non-GAAP financial measures to the comparable GAAP results, which is provided in a table immediately below the Condensed Consolidated Statements of Operations. The non-GAAP financial measures disclosed by the Company should not be considered a substitute for, or superior to, financial measures calculated in accordance with GAAP, and the financial results calculated in accordance with GAAP and reconciliations to those financial statements should be carefully evaluated. The non-GAAP financial measures used by the Company may be calculated differently from, and therefore may not be comparable to, similarly titled measures used by other companies. For additional information regarding these non-GAAP financial measures, and management’s explanation of why it considers such measures to be useful, refer to the Form 8-K dated April 29, 2008, that the Company filed with the Securities and Exchange Commission.

Forward-Looking Statements

This press release may contain forward-looking statements about the Company, including, without limitation, benefits and performance expected from use of the Company’s 1T-SRAM, 1T-FLASH and analog/mixed-signal technologies, the Company’s execution and results, improving operational efficiencies, growth of the business and future business prospects.

Forward-looking statements are based on certain assumptions and expectations of future events that are subject to risks and uncertainties. Actual results and trends may differ materially from historical results or those projected in any such forward-looking statements depending on a variety of factors. These factors include but are not limited to, customer acceptance of our proprietary technologies for 1T-SRAM, 1T-FLASH and analog/mixed-signal, the timing and nature of the license agreements to be entered into with our customers and their requests for our services under existing license agreements, the timing of customer acceptance of our work under such agreements, the level of commercial success of licensees’ products, ease of manufacturing and yields of devices incorporating our proprietary technologies, our ability to enhance our existing proprietary technologies and develop new technologies, the level of intellectual property protection provided by our patents, the expenses and other consequences of litigation, including intellectual property infringement litigation, to which we may be or may become a party from time to time, the vigor and growth of markets served by our licensees and customers and operations of the Company and other risks identified in the Company’s most recent report on forms 10-K filed with the Securities and Exchange Commission, as well as other reports that MoSys files from time to time with the Securities and Exchange Commission. MoSys undertakes no obligation to update publicly any forward-looking statement for any reason, except as required by law, even as new information becomes available or other events occur in the future.