Simplify the following text for a Grade 15 native English-speaking person.
Original: Many other multinational companies like Caterpillar , DuPont , Cargill have their international headquarters in the city , Take Two Interactive , Electronic Arts , INVISTA , Procter & Gamble and Sun Microsystems have their European headquarters in the city .
Simplified: Many other multinational companies like Caterpillar , DuPont , Electronic Arts , Hewlett-Packard , INVISTA , Procter & Gamble and Sun Microsystems have their European headquarters in the city too .