Fabless semiconductor firms that outsource their chip manufacturing to outside foundries face bigger challenges competing against chipmakers, like Intel (INTC) and Samsung, that own their production factories, says Jefferies & Co. analyst Mark Lipacis in a report. Jefferies downgraded Altera (ALTR), a fabless firm, to hold from buy, and upgraded Maxim Integrated Products (MXIM), which has manufacturing facilities, to buy from hold. It upped its