"Foster Wheeler, an engineering and construction firm that provides services to the oil and gas industry, did business in Iran until 2006, when it told the Securities and Exchange Commission it was withdrawing. It used to be a United States-based company, but moved in 2001 to Bermuda, which allowed it to avoid United States corporate income taxes, and has since moved again to Switzerland."
While the company was performing business in Iran from 2000 to 2006, Foster Wheeler was the recipient of $199 million in U.S. federal funds. (The New York Times, "Profiting from Iran, and the U.S.", 3/6/10)
The company is listed as subcontractor for the South Pars Field Phase 6.7. & 8 (Petropars website)
"According to "Tehran Times", U.S.-based engineer Foster Wheeler is optimistic about business prospects in Iran, according to its executive president Gianni Bachiddu. According to Middle East Economic Digest (MEED), he said there was a "tremendous amount" of engineering and project management consultants coming from both the National Iranian Oil…" (IPR Strategic Business Information Database, "US's Foster Wheeler Optimistic over Iran's Prospects", 3/20/2002)
The company has reportedly withdrawn from doing business in Iran.