Each year, “Fortune” publishes its ranking of the world’s 100 fastest-growing companies based on revenues, profits and stock returns. This year’s list includes several companies led by YPO members whose companies are among those driving the global economy. Meet two of these YPO high-achievers among those leading Fortune’s award-winning companies.

Ken McBride is Chief Executive Officer and Chairman at Stamps.com, among the first companies to be approved by the U.S. Postal Service to sell postage online. Stamps.com came at number two in the “Fortune” ranking, recording a revenue of USD497 million in the past four quarters. With more than 735,000 monthly subscribers and a recent acquisition of U.K.-based software company MetaPack, Stamps.com is set to expand internationally. McBride joined the YPO Santa Monica Bay Chapter in 2012 in California, USA.

Brian Fetterolf is President and Chief Executive Officer of TriState Capital, a wholly-owned subsidiary of TriState Capital Holdings Inc, ranked 99 in the “Fortune” list. This is the second year the company is listed as one of the fastest-growing financial services firms in the nation, with earnings per share growing 30 percent, assets exceeding USD5 billion and assets under investment management of USD10 billion. Fetterolf joined the YPO Pittsburgh Chapter in 2015 in Pennsylvania, USA.