Align Technology to be Added to the Russell 3000 Index Santa Clara, Calif. - June 26, 2001 -- Align Technology, Inc. (Nasdaq: ALGN), the inventor of the Invisalign^® System, a proprietary method of straightening teeth without unsightly wires and brackets, today announced that it has been included on the preliminary list of companies selected to be added to the Russell 3000 Index^®. The Index is reconstituted on June 29, 2001 and goes into effect on July 1, 2001. The final membership list will be made available to the investing public on July 9, 2001.

The Russell 3000 Index^® includes the 3,000 largest U.S. companies based on total market capitalization. The reconstitution will include companies with market capitalizations ranging from $178 million to $520 billion. This represents approximately 98 percent of the investable U.S. equity market.

"We are pleased to be included on the preliminary list of companies to be named to the Russell 3000 Index^®," said Zia Chishti, CEO of Align Technology. "Since more than $180 billion is invested in funds that rely on Russell's U.S. indexes as investment models, we believe inclusion in this index will help to increase our visibility among the investing public," added Chishti.

About Align Technology

Align Technology designs, manufactures and markets the Invisalign System, a proprietary new method for treating malocclusion, or the misalignment of teeth. The Invisalign System corrects malocclusion using a series of clear, nearly invisible, removable appliances that gently move teeth to a desired final position. Because it does not rely on the use of metal or ceramic brackets and wires, the Invisalign System significantly reduces the aesthetic and other limitations associated with braces. Invisalign is appropriate for treating adults and older teens. Align Technology was founded in March 1997 and received FDA clearance to market the Invisalign System in 1998.

This release may contain forward-looking statements based on Align Technology's current expectations. Forward-looking statements in this release include, without limitation, references to the possible inclusion of Align Technology on the Russell Index and the impact of such inclusion on Align Technology's visibility to the investing public. These forward-looking statements involve risks and uncertainties. A number of important factors could cause actual results to differ materially from those in the forward-looking statements. These factors include a decision by the Russell Index not to include Align Technology on the next revision of its list or an absence of increased visibility, even if Align Technology is included on the next revision of the list. A number of other factors that could cause actual results to differ materially from those in the forward-looking statements are discussed in detail in Align Technology's registration statement on Form S-1, as well as other reports and documents filed from time to time with the Securities and Exchange Commission.