News Release

SAN DIEGO, Dec. 20, 2013 /PRNewswire/ -- Tandem Diabetes Care^®, Inc. (NASDAQ: TNDM), a medical device company and manufacturer of the t:slim^® Insulin Pump, today announced that the company was added to the Russell 2000® and Russell 3000® Indexes following reconstitution of Russell Investment Group's family of US indexes after market close on December 20, 2013.

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"Being added to the Russell 2000 and Russell 3000 Indexes creates an opportunity to increase our overall visibility among key institutional investors," said Kim Blickenstaff, president and CEO of Tandem. "We believe that added exposure is ultimately beneficial to the company, our shareholders, and our customers."

The Russell 2000® Index measures the performance of the small-cap segment of the U.S. equity market and is a subset of the Russell 3000®, representing approximately 10 percent of the total market capitalization of that index. Membership in the Russell 2000® Index includes automatic inclusion in the appropriate growth and style indexes.

Russell indices are widely used by investment managers and institutional investors for index funds and as benchmarks for both passive and active investment strategies. Russell Investments determines membership for each index based on objective market capitalization rankings and style attributes. More than $3.9 trillion in assets are currently benchmarked to the Russell family of indexes.

About Tandem Diabetes Care, Inc.
Tandem Diabetes Care, Inc. (www.tandemdiabetes.com) is a medical device company with an innovative, user-centric and integrated approach to the design, development and commercialization of products for people with insulin-dependent diabetes. The Company manufactures and sells the t:slim Insulin Pump, the slimmest and smallest durable insulin pump currently on the market, and the first and only insulin pump with a high resolution, color touch screen. Tandem is based in San Diego, California.

Follow Tandem Diabetes Care on Twitter @tandemdiabetes, use #tslim and #tconnect.
Follow Tandem Diabetes Care on Facebook at www.facebook.com/TandemDiabetes.

t:slim and Tandem Diabetes Care are registered trademarks, and t:connect is a trademark, of Tandem Diabetes Care, Inc.

SOURCE Tandem Diabetes Care, Inc.