SEASONED SOFTWARE EXECS & SERIAL ENTREPRENEURS JOIN STREAMBASE TO DRIVE HIGH-GROWTH CEP PRODUCT, BIZ DEV STRATEGIES

Boston, MA - 20 December 2006

StreamBase Augments Existing Executive Management & Board Member Leadership With Proven Industry Veterans & Venture Capital Visionaries

StreamBase Systems Inc., provider of the industry’s fastest and most powerful real-time and historical Complex Event Processing (CEP) software, today announced the addition of enterprise software executive Dr. Michael Waclawiczek as its senior vice president of products. Waclawiczek has more than 20 years of success in leading product and go-to-market strategies for major software products that have generated over $1 billion (USD) in license revenue. In addition, StreamBase has added two new members to its Board of Directors – Paul Maeder, co-founder and managing general partner at Highland Capital Partners, and Dr. Felda Hardymon, who serves as a venture partner at Bessemer Venture Partners and a senior professor at Harvard Business School.

“The additional expertise of Michael, Paul, and Felda complements our existing executive leadership and also provides the additional expertise to drive increased growth and competitive advantage,” said Barry Morris, chairman and CEO of StreamBase. “We anticipate that 2007 will bring forth an abundance of market and competitive activity around Complex Event Processing from both small emerging players and larger industry software vendors. The combination of a management team comprised of seasoned software and technology executives and a board of directors offering top-notch VC talent further positions us to be the dominant player in the stream processing market.”

Dr. Michael Waclawiczek joins StreamBase as senior vice president of products. In this new position, Waclawiczek will lead the company's product management and marketing efforts for StreamBase's award-winning CEP software. Waclawiczek has a wealth of experience in driving product management, product marketing, and corporate marketing strategies for both well-established enterprise software vendors and emerging technology ventures. Since the mid-1980s, he has played a pivotal role in launching more than twenty major software products. Waclawiczek's proven expertise has resulted in cementing competitive advantage and industry leadership for companies such as Kalido, IONA Technologies, Object Design, ICAD and EDS Unigraphics. Before joining StreamBase, he was vice president of marketing and product management at Kalido, the leading provider of adaptive enterprise data warehousing and master data management software. Under his leadership, Kalido tripled its revenues to $18.5 million in 2005.

Paul Maeder joins StreamBase’s Board of Directors team with more than 28 years of software experience and over 22 years experience in venture capital. At Highland Capital Partners, Maeder focuses on information and healthcare technology investments, most notably software, as well as systems, security, and diagnostics. Maeder is a former director of Avid Technology (Nasdaq: AVID), CheckFree (Nasdaq: CKFR), Chipcom, HighGround Systems (acquired by Sun Microsystems), Mainspring (acquired by IBM), Relicore (acquired by Symantec), SCH (acquired by Legato Systems), SQA (acquired by Rational

Corporation), Sybase (Nasdaq: SYBS), VistaPrint (Nasdaq: VPRT) and WebLine Communications (acquired by Cisco Systems).

Dr. Felda Hardymon comes to StreamBase’s Board of Directors with a strong background in both private equity and business management and offers unparalleled insights into technology innovation and strategies. Hardymon joined Bessemer Venture Partners in 1981 as a general partner. After more than 20 years with the firm, he became a venture partner to enable him to teach and do research at Harvard Business School. During his career, Hardymon has invested in young companies in the software, communications and retail sectors, including AmericanSuperconductor (NASDAQ:AMSC), Cascade Communications (acquired by Ascend), Celcore (acquired by DSC),Celtel (acquired by MTC), Parametric Technology (NASDAQ:PMTC), the Sports Authority (NYSE: TSA), Staples (NASDAQ:SPLS) and VideoServer (NASDAQ:VSVR).

Earlier this year, StreamBase secured top-notch senior level talent to further lead its financial and business development strategies. Savvy high-tech financial veteran Terry Halloran joined StreamBase as chief financial officer. Halloran has a distinguished career in finance offering the expertise to drive both an immediate and a long-lasting impact on business growth. Marco Farsheed also joined StreamBase as vice president of strategic business development. Farsheed is an executive with an impressive array of accomplishments in building successful software and services businesses.

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