Press Release Details

Real time e-business network monitoring firm ranks high at #16

WESTFORD, Mass.--(BUSINESS WIRE)--May 26, 2000-- NetScout(R) Systems, Inc. (NASDAQ: NTCT), a global provider of business-critical network and application performance management solutions, today announced that the company has been ranked 16th among the top 100 Hot Growth Companies in the US by Business Week Magazine in its May 29th issue. Companies were selected for this year's list based on excellence in a combination of sales growth, earnings growth and return on investment capital. NetScout is one of only four Massachusetts companies to make this year's list, and was the highest rated of those four.

With over 50,000 devices installed worldwide, NetScout solutions are targeted towards Fortune 1000 enterprise networks, their business-to-business and business-to-consumer e-commerce initiatives, as well as dot.com and service provider markets. NetScout recently announced its nGenius(TM) performance management system, which ensures maximum network and application uptime and availability for e-business. With the nGenius solutions users can conduct a wide range of performance analysis from monitoring website responsiveness and error rate to isolating problem areas - such as network or server slow-downs - in the back office.

"We are delighted by our presence among Business Week's Hot Growth Companies for 2000," said Anil Singhal, Chairman and Chief Executive Officer, NetScout Systems. "Our high ranking--based on growth, profitability and investment return criteria--confirms the effectiveness of our strategy and execution. NetScout's success has been based on technology vision, product leadership, and financial strength. Early feedback from our customers, partners, and industry, adds to our confidence that with our new nGenius product line, and our growing sales infrastructure, we will continue to drive top and bottom line growth, and high return on investment."

About NetScout Systems, Inc.

NetScout Systems, Inc. (NASDAQ: NTCT) is a leading provider of networked application performance management solutions. NetScout's solutions ensure e-business applications stay up and running at optimum performance through real-time, system-wide visibility and actionable information for fault isolation. NetScout's products are deployed worldwide in industries such as e-commerce, finance, healthcare, government, manufacturing and others. NetScout serves approximately half of the Fortune 500 and counts among its customers 3M Corporation, AT&T, Goldman Sachs & Co., Datek Online, Bristol-Myers Squibb, Amazon.com, Webhire, Intel Online, Fidelity Investments, Xerox and Sun Microsystems.

NetScout's unique Application Flow Management (AFM) technology collects and presents the rich set of application and web traffic information via NetScout's application-aware instrumentation and reporting and analysis software. Headquartered in Westford, Massachusetts, NetScout has approximately 250 employees and offices in North America, Europe and Asia. Further information on the company is available on the World Wide Web at www.netscout.com

Forward-looking statements in this release are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934. Investors are cautioned that statements in this press release which are not strictly historical statements constitute forward-looking statements which involve risks and uncertainties. Actual results could differ materially from the forward-looking statements. Risks and uncertainties which could cause actual results to differ include, without limitation, risks and uncertainties associated with the company's strategic relationships with Cisco Systems and other partners, dependence upon broad-based acceptance of the company's Application Flow Management solutions, introduction and market acceptance of new products and product enhancements, competitive pricing pressures, reliance on sole source suppliers, successful expansion and management of the indirect distribution channels, and dependence on proprietary technology, as well as risks of downturns in economic conditions generally and in the market for network and application performance management solutions specifically, and risks associated with year 2000 problems affecting the company, its partners and its customers. For a more detailed description of the risk factors associated with the company, please refer to the company's prospectus dated August 12, 1999 and the Quarterly Report on Form 10-Q for the quarter ended September 30, 1999, on file with the Securities and Exchange Commission.

NetScout is a registered trademark, and the NetScout logo, WebCast, AppScout, and NetScout Manager Plus are trademarks of NetScout Systems, Inc.