The following information is furnished and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

On April 23, 2009, Power-One, Inc. (the "Company") issued a press release announcing the Company's financial and operating results for the first fiscal quarter of 2009. A copy of the press release is furnished as Exhibit 99.1 hereto and is incorporated into Item 2.02 of this Form 8-K by reference.

The book value of the Company's shareholders' equity as of March 29, 2009 was $116.25 million and the Company's corresponding book value per share was $1.32 based on total shares outstanding of 87,942,177 as of such date.

(d) Exhibits

Exhibit Number                               Description

99.1             Press release reporting the Company's financial and operating
                 results for the first fiscal quarter of 2009.