SGTL Sigmatel (MM)

SigmaTel, Inc. (NASDAQ: SGTL) provides the following information to supplement and amend its Proxy Statement, dated February 29, 2008, furnished to stockholders in connection with the solicitation of proxies on behalf of the board of directors of SigmaTel for use at the Special Meeting of Stockholders to be held on Monday, April 21, 2008, at 9:00 a.m. Central time at the offices of Vinson & Elkins L.L.P., The Terrace 7, 2801 Via Fortuna, Suite 100, Austin, Texas. The purposes of the Special Meeting are as stated in the Notice of Special Meeting of Stockholders, dated February 29, 2008, which accompanied the Proxy Statement. This supplement should be read in conjunction with the Proxy Statement. SigmaTel has retained Georgeson Inc. (�Georgeson�) to assist in the solicitation of proxies for a base fee of $10,000, plus expenses incurred in Georgeson�s performance, and has agreed to indemnify Georgeson for liabilities and expenses, including attorney�s fees, arising out of its performance and not resulting from Georgeson�s gross negligence or intentional misconduct, as determined by a court of law pursuant to a final and nonappealable judgment. Additional Information about the Proposed Transaction and Where to Find It SigmaTel has filed a definitive proxy statement and other documents regarding the proposed transaction described in this press release with the Securities and Exchange Commission. INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE PROXY STATEMENT AND SUCH OTHER MATERIALS BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT SIGMATEL AND THE PROPOSED TRANSACTION. A definitive proxy statement was sent to security holders of SigmaTel seeking their approval of the transaction. Investors and security holders may obtain a free copy of the definitive proxy statement and other documents filed by SigmaTel with the Securities and Exchange Commission at the SEC�s web site at www.sec.gov. The definitive proxy statement and other relevant documents may also be obtained free of cost by directing a request to Martha Aviles at 512-744-9968. SigmaTel�s directors and executive officers may be deemed, under Securities and Exchange Commission rules, to be participants in the solicitation of proxies from the SigmaTel�s stockholders in connection with the proposed transaction. Information about SigmaTel�s directors and officers can be found in SigmaTel�s Proxy Statements and Annual Reports on Form�10-K filed with the SEC. Additional information regarding the interests of those persons may be obtained by reading the proxy statement and other documents regarding the proposed transaction.