Some of them are under Western sanctions. Others hold foreign passports, work with business leaders across Asia, and have publicly listed companies on Asian markets.
On May 12, a number of executives formed the Cape Negrais Committee, named after the site where the cyclone first slammed into southern Burma's Irrawaddy Delta.
The team has so far helped 45,000 to 75,000 people on Middle Island, one of their areas of operation in the delta, says Mark Tippetts, an Englishman and longtime Burma resident who oversees the Pun Hlaing golf course, a favorite haunt of Burma's elite.
The hard-to-reach delta is where many of the more than one million people who have yet to receive aid are located, according to the United Nations.
Htoo Trading, led by young entrepreneur Tay Za, is operating in the delta's Bogale area. Tay Za came under US economic sanctions last October when President Bush tightened restrictions on ranking members of Burma's ruling junta and associated business groups.