C. Randal Mills, Ph.D., President and Chief Executive Officer of Osiris Therapeutics, Inc., presides over the closing bell.

Friday August 3, 2007
from Nasdaq MarketSite
in New York's Times Square

Osiris Therapeutics, Inc.
[OSIR]

Osiris Therapeutics, Inc. is a leading stem cell therapeutic company focused on developing and marketing products to treat medical conditions in the inflammatory, orthopedic and cardiovascular areas.

Osiris currently markets and sells OSTEOCEL(r) for regenerating bone in orthopedic indications. PROCHYMAL(tm) is in Phase III clinical trials and is the only stem cell therapeutic currently designated by FDA as both an Orphan Drug and Fast Track product. The company's pipeline of internally developed biologic drug candidates under evaluation also includes CHONDROGEN(tm) for regenerating cartilage in the knee, and PROVACEL(tm), for repairing heart tissue following a heart attack.

Osiris is a fully integrated company, having developed stem cell capabilities in research and development, manufacturing, marketing and distribution. Osiris has developed an extensive intellectual property portfolio to protect the company's technology in the United States and a number of foreign countries including 47 U.S. and 167 foreign patents owned or licensed. More information can be found on the company's website, www.Osiris.com. (OSIR-G).

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Click for larger pictures of the NASDAQ MarketSite. Additional Photographs for 08/03/2007 Download Hi-Res Quality Photo of this NASDAQ Market Open - Pictured: C. Randal Mills, Ph.D., President and Chief Executive Officer of Osiris Therapeutics, Inc., presides over the closing bell. Organizations interested in obtaining NASDAQ-listed company bell ringing ceremony photographs for press purposes, must first receive approval from the listed company before requesting photographs from NASDAQ. Please provide the company contact information from whom you received approval to Jolene Libretto at Jolene.Libretto@nasdaq.com. Kindly credit © 2007, The Nasdaq Stock Market, Inc. Reprinted with permission. © Copyright 2007, The NASDAQ Stock Market, Inc. Reprinted with the permission of The Nasdaq Stock Market, Inc.