Item 8.01. Other Events.

Momenta Pharmaceuticals, Inc., a Delaware corporation (the "Company"), announced that on September 26, 2008 its collaboration partner, Sandoz Inc. ("Sandoz"), a division of Novartis, submitted to the U.S. Food and Drug Administration (the "FDA") an amendment to Sandoz' Abbreviated New Drug Application ("ANDA") for Enoxaparin Sodium Injection. The Company believes the ANDA amendment to be a complete response to the FDA addressing the potential for immunogenicity of the drug product.

Cautionary Note Regarding Forward-Looking Statements

This Current Report on Form 8-K may contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended. For this purpose, any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements.

Forward-looking statements can be identified by terminology such as "anticipate," "believe," "could," "could increase the likelihood," "estimate," "expect," "intend," "is planned," "may," "should," "will," "will enable," "would be expected," "look forward," "may provide," "would" or similar terms, variations of such terms or the negative of those terms. Such forward-looking statements involve known and unknown risks, uncertainties and other factors including those risks, uncertainties and factors referred to in the Company's Annual Report on Form 10-K for the year ended December 31, 2007 filed with the Securities and Exchange Commission under the section "Risk Factors," as well as other documents that may be filed by the Company from time to time with the Securities and Exchange Commission. As a result of such risks, uncertainties and factors, the Company's actual results may differ materially from any future results, performance or achievements discussed in or implied by the forward-looking statements contained herein. The Company is providing the information in this Current Report on Form 8-K as of this date and assumes no obligations to update the information included herein or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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