Universal Insurance Holdings
Illumina

This year's Fastest-Growing Companies marks the 19th running of the list.

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To qualify, a company-domestic or foreign-must be trading on a major U.S. stock exchange; report data in U.S. dollars; file quarterly reports with the SEC; have a minimum market capitalization of $250 million and a stock price of at least $5 on June 30, 2015; and have been trading continuously since June 30, 2012. Companies must have revenue and net income for the four quarters ended on or before April 30, 2015, of at least $50 million and $10 million, respectively; and have posted an annualized growth in revenue and earnings per share of at least 15% annually over the three years ended on or before April 30, 2015.

Companies that meet these criteria are ranked by revenue growth rate; EPS growth rate; and three-year annualized total return for the period ended June 30, 2015. (To compute the revenue and EPS growth rates, Fortune uses a trailing four quarters log linear least square regression fit.)

The overall rank is based on the sum of the three ranks. Once the 100 companies are identified, they are then re-ranked within the 100, using the three equally weighted variables. If there is a tie, the company with the larger four-quarter revenue receives the higher rank.

Excluded are real estate investment trusts, limited liability companies, limited partnerships, business development companies, closed end investment firms, companies about to be acquired, and companies that lost money in the quarter ended on or before April 30, 2015. In addition, Fortune excludes companies that have announced intentions to restate previously reported financial data, if these errors appear to have a significant impact. Also, Fortune excludes companies that lost money in the quarter ended May 31 or June 30, if the loss represents a deterioration in business conditions. The data are provided by Zacks Investment Research. The data checking process was aided by information provided by S&P Capital IQ, Hoover’s, FactSet Research Systems, and Morningstar Document Research.

—By Scott DeCarlo, Douglas G. Elam, Orlaith Farrell, Vivian Giang, Kathleen Smyth

This year's Fastest-Growing Companies marks the 19th running of the list. In our annual list of public companies with the most stellar three-year profit, revenue, and stock growth, Facebook makes its first appearance.

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27.

AmTrust Financial Services

Last year's Rank: 63

Strong economy creates need for workers’ comp policies and warranties for big purchases, services offered by this small-business and “specialty risk” insurer.

Company Information

Location New York, NY
Industry Insurance: Property & Casualty
Sector Financial
Fortune 500 Rank 615
Fortune 500 Profile http://fortune.com/fortune500/amtrust-financial-services-615/
Current Streak 2
Years on List 3
CEO Barry D. Zyskind
Website http://www.amtrustgroup.com

Revenue, Net Income

$ millions
Revenue Past Four Quarters 4248
Net Income Past Four Quarters 505

Growth Rates

%
EPS 3 yr Annual Growth Rate 40%
Rev 3 yr Annual Growth Rate 46%
Total Return 3 yr Annual Rate 41%
Beat S&P 3 yr Total Return?

Rank

#
EPS Growth Rank 58
Revenue Growth Rank 15
Total Return Rank 52
Fortune's Take On AmTrust Financial Services
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