The class of '06
Welcome to our annual ranking of supercharged performers.

(Fortune Magazine) -- During the 16 times that Fortune has compiled our list of the 100 Fastest-Growing Companies, we've learned a few things. One is that sustaining growth at these levels ain't easy. Only 43 of the 100 companies from last year's list made the grade again this year. Another is that being in the right place at the right time can be just as important as how you run your business. The latest example: In 2005, oil prices averaged $52 a barrel, up from $38 a barrel in 2004. Voilą! Almost a third of the companies on this year's list are in the energy sector, including No. 1, Vaalco Energy.

To compute the rankings, we use data from Zacks Investment Research and give equal weight to three factors: profit and sales growth (for three years through the first quarter of 2006) and three-year total return (through June). For additional details, see fortune.com.

By L. Michael Cacace (Senior List Editor), Douglas Elam, Eugenia Levenson, Jenny Mero, Anastasia Serdyukova, Christopher Tkaczyk and Richard K. Tucksmith Top of page

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Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.
Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.