Intergraph Board of Directors and Management to Ring NASDAQ Stock Market Opening Bell

Commemorates Intergraph’s 25th Anniversary on NASDAQ

HUNTSVILLE, Ala., April 19, 2006 – Intergraph Corporation , a leading global provider of spatial information management (SIM) software, today announced that Sidney L. McDonald, Chairman of the Board, and R. Halsey Wise, President and Chief Executive Officer, will preside over The NASDAQ Stock Market opening bell on April 20, 2006. The event commemorates Intergraph’s 25th anniversary of being a publicly listed company on the Exchange.

“Our 25 years of trading on the NASDAQ is a tribute to the commitment, dedication and creativity of our 3,400 worldwide employees. Intergraph’s Board of Directors is pleased to celebrate this important milestone in our Company’s history” said Sidney L. McDonald, Chairman of the Intergraph Board of Directors.

R. Halsey Wise, Intergraph’s President and Chief Executive Officer, added, “We believe Intergraph has never been more relevant during our 25-year history of being a publicly listed company on the NASDAQ. Our software plays an important role in today’s global environment of heightened security concerns, increased use of spatial and location-aware technologies, and rising global demand for energy and critical infrastructure.”

Where: NASDAQ MarketSite -- 4 Times Square -- 43rd & Broadway -- Broadcast Studio

When: Thursday, April 20, 2006 at 9:30 a.m. EST

Broadcast Feed Information: The opening bell is available from 9:20 a.m. to 9:35 a.m. on uplink IA-5 C-band/transponder 14. The downlink frequency is 3980 horizontal; audio: 6.2/6.8. The feed can also be found on Waterfront fiber 1623. If you have any questions, please contact Stephanie Lowenthal at (646) 441-5220.

Photos: To obtain a hi-resolution photograph of the Market Open, please go to http://www.nasdaq.com/reference/marketsite_events.stm and click on the market open of your choice.

About Intergraph

Intergraph Corporation (NASDAQ: INGR) is the leading global provider of spatial information management (SIM) software. Security organizations, businesses and governments in more than 60 countries rely on the company’s spatial technology and services to make better and faster operational decisions. Intergraph’s customers organize vast amounts of complex data into understandable visual representations, creating intelligent maps, managing assets, building and operating better plants and ships, and protecting critical infrastructure and millions of people around the world. For more information, visit www.intergraph.com.

© 2006 Intergraph Corporation. All rights reserved. Intergraph and the Intergraph logo are registered trademarks of Intergraph Corporation. Other brands and product names are trademarks of their respective owners.

Contact Information

Carlos DellaMaddalena

Director, Corporate Communications

Intergraph Corporation

Contact via E-mail