IPG Photonics Corporation (Nasdaq Global Market: IPGP) (“IPG” or the “Company”) today announced the closing of its public offering of 3,000,000 shares of its common stock, consisting of 2,800,000 shares sold by the Company and 200,000 shares sold by the Company’s chairman and chief executive officer, Dr. Valentin P. Gapontsev. The price per share in the public offering was $54.30, resulting in net proceeds to the Company, after underwriting discounts and commissions, and estimated transaction expenses, of $144.7 million. The Company did not receive any proceeds from the sale of shares in the offering by Dr. Gapontsev. BofA Merrill Lynch served as sole bookrunning manager for this offering and Needham & Company and Stifel Nicolaus Weisel served as co-managers. An automatic shelf registration statement relating to the securities offered in this offering was filed with the Securities and Exchange Commission (the “SEC”) on February 27, 2012. The offering of these securities was made pursuant to a prospectus supplement to the prospectus contained in the shelf registration statement, which prospectus supplement was filed with the SEC on March 2, 2012. The prospectus and final prospectus supplement are available at no charge on the SEC’s Web site at www.sec.gov. Copies of the prospectus and final prospectus supplement also may be obtained from BofA Merrill Lynch, 4 World Financial Center, New York, NY 10080, Attention: Prospectus Department, or by emailing a request to firstname.lastname@example.org. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state. About IPG Photonics Corporation IPG Photonics Corporation is the leading developer and manufacturer of a broad line of high-performance fiber lasers, fiber amplifiers and diode lasers that are used in numerous applications in diverse end markets. IPG has its headquarters in Oxford, Massachusetts, and has additional plants and offices throughout the world. For more information, please visit www.ipgphotonics.com.