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Rubicon Technology Appoints Warren S. Stewart III as Senior Vice President of Sales and Marketing

  Rubicon Technology Appoints Warren S. Stewart III as Senior Vice President
  of Sales and Marketing

Business Wire

BENSENVILLE, Ill. -- November 21, 2013

Rubicon Technology, Inc. (NASDAQ:RBCN), a leading provider of sapphire
substrates and products to the LED, semiconductor, and optical markets, today
announced that Warren S. Stewart III has joined the Company as Senior Vice
President of Sales and Marketing, effective immediately. Mr. Stewart was
formerly Vice President, Sales, at Cree, Inc., in Durham, North Carolina. He
will provide leadership to Rubicon’s global sales and marketing team,
reporting to Raja M. Parvez, President and Chief Executive Officer.

“Warren Stewart’s experience forging strong relationships with leading
manufacturers in the LED industry and driving sales growth make him an
excellent addition to Rubicon at this pivotal stage,” said Mr. Parvez. “With
the recent launch of our line of large-diameter Patterned Sapphire Substrates
(PSS), we are bringing an all-new value proposition to the world’s most
sophisticated LED chip-makers. Warren’s depth of industry experience and his
proven leadership skills will provide an advantage in the further development
of our global customer relationships,” he concluded.

Mr. Stewart served as Vice President, Sales, at Cree, Inc., from 2005 to 2013
and was employed by Cree since 1997 in increasingly responsible sales
management roles. Previously, following his service as an officer in the
United States Navy, he gained international experience in advanced materials
with Superior Graphite Co. He earned an M.B.A. degree from the International
University of Japan in Niigata-ken, Japan, and a B.S. degree from the United
States Naval Academy in Annapolis, Maryland.

“Rubicon’s reputation in the sapphire industry for product quality,
innovation, and reliability has created an excellent platform for the next
stage in the company’s development,” said Mr. Stewart. “I am delighted to join
the team now, when Rubicon is facilitating even greater efficiency for its LED
customers with large-diameter polished wafers and PSS and, at the same time,
is enhancing its capabilities for premium quality optical sapphire.”

About Rubicon Technology

Rubicon Technology, Inc. is a vertically integrated advanced electronic
materials provider specializing in monocrystalline sapphire for applications
in light-emitting diodes (LEDs), optical systems and specialty electronic
devices. Rubicon has an unmatched technology platform and expertise extending
from the preparation of raw aluminum oxide through sapphire crystal growth and
fabrication to large-diameter polished sapphire wafers and patterned sapphire
substrates (PSS), enabling Rubicon to supply custom sapphire products with
superior quality and precision. Rubicon is ISO 9001 certified and ITAR
registered.

Further information is available at www.rubicontechnology.com.

Contact:

Rubicon Technology, Inc.
Dee Johnson
Vice President, Investor Relations
847-457-3426