Autonomy Named One of the UK's Fastest Growing Technology Companies

Prestigious Deloitte Technology Fast 50 Recognition Celebrates Autonomy's 796% Growth in Revenues for the Period 2005 - 2009

CAMBRIDGE, England and SAN FRANCISCO, October 28, 2010 - Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, today announced that it has been
acknowledged by the highly coveted Deloitte Technology Fast 50 awards
program, which ranks the UK's 50 fastest growing technology companies based
on percentage growth over five years. Autonomy received the coveted accolade
due to its growth rate of 796% from 2005 to 2009, despite the global
recession. Previous winners have included some of the most dynamic players in
tech, biotech and digital media technology.

The program is supported by the Deloitte Technology Fast 50 initiatives,
which rank high-growth technology companies by country, and is sponsored by
Taylor Wessing, a leading International law firm with a focus on the
industries of tomorrow, and Fidelity Growth Partners Europe, a venture and
growth capital investor which backs technology entrepreneurs with aspiration
for greatness.

"Being one of the fastest growing companies in the UK is an impressive
accomplishment," said Peter O'Donoghue, Deloitte Technology partner for the
London region. "With its 796% growth rate over five years, Autonomy has
proven that its technology is resilient in tough economic climates and its
management team has the vision and determination to grow the company under
competitive conditions."

Founded in 1996 and utilizing ground breaking pattern-matching
technologies borne out of research at Cambridge University, Autonomy has
experienced a meteoric rise. With a market cap of $6 billion, Autonomy is now
the largest software company in the UK and the second largest in Europe. At
the heart of Autonomy's sustained business success lies Autonomy's unique
infrastructure software platform, the Intelligent Data Operating Layer
(IDOL). Its revolutionary meaning-based technology forms an understanding of
all data in the enterprise, including human-friendly formats such as Web
pages, emails, voice and video, to provide the most comprehensive enterprise
software solutions ranging from compliance suites to marketing optimization
applications, all on a single platform.

"This prestigious accolade is a testament to Autonomy's exponential
growth over the last few years," said Ian Black, Head of Global Operations at
Autonomy. "To be a FTSE 100 company, the UK's largest software company and
yet one of the country's 50 fastest growing technology companies is a unique
combination of achievements. We are delighted that our meaning-based
technology, continuous efforts to innovate and industry-shifting vision have
generated dramatic growth for Autonomy and won us a place among the Deloitte
Technology Fast 50 companies."

Please visit www.autonomy.com to learn about Autonomy and
www.deloitte.co.uk/Fast50/ to find out more about Deloitte Technology
Fast 50.

About Autonomy

Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, spearheads the Meaning Based
Computing movement. IDC recently recognized Autonomy as having the largest
market share and fastest growth in the worldwide search and discovery market.
Autonomy's technology allows computers to harness the full richness of human
information, forming a conceptual and contextual understanding of any piece
of electronic data, including unstructured information, such as text, email,
web pages, voice, or video. Autonomy's software powers the full spectrum of
mission-critical enterprise applications including pan-enterprise search,
customer interaction solutions, information governance, end-to-end
eDiscovery, records management, archiving, business process management, web
content management, web optimization, rich media management and video and
audio analysis.

Autonomy's customer base is comprised of more than 20,000 global
companies, law firms and federal agencies including: AOL, BAE Systems, BBC,
Bloomberg, Boeing, Citigroup, Coca Cola, Daimler AG, Deutsche Bank, DLA
Piper, Ericsson, FedEx, Ford, GlaxoSmithKline, Lloyds TSB, NASA, Nestle, the
New York Stock Exchange, Reuters, Shell, Tesco, T-Mobile, the U.S. Department
of Energy, the U.S. Department of Homeland Security and the U.S. Securities
and Exchange Commission. More than 400 companies OEM Autonomy technology,
including Symantec, Citrix, HP, Novell, Oracle, Sybase and TIBCO. The company
has offices worldwide. Please visit www.autonomy.com to find out more.

Autonomy and the Autonomy logo are registered trademarks or trademarks of
Autonomy Corporation plc. All other trademarks are the property of their
respective owners.

    Autonomy Editorial Contacts:

    Assia Iossifova                    David Vindel
    Autonomy (UK)                      The Red Consultancy
    +44-1223-448000                    +44-207-025-6529
    assia.iossifova@autonomy.com       David.vindel@redconsultancy.com

    Edward Bridges                     Louise Kehoe
    Financial Dynamics (UK)            Ogilvy PR (US)
    +44-207-831-3113                   +1-415-677-2739
    edward.bridges@fd.com              louise.kehoe@ogilvypr.com

Assia Iossifova of Autonomy (UK), +44-1223-448000, assia.iossifova at autonomy.com; or David Vindel of The Red Consultancy, +44-207-025-6529, david.vindel at redconsultancy.com; or Edward Bridges of Financial Dynamics (UK), +44-207-831-3113, edward.bridges at fd.com; or Louise Kehoe of Ogilvy PR (US), +1-415-677-2739, louise.kehoe at ogilvypr.com