XM Satellite Radio Holdings Inc. announced on Monday that it now has more than 1 million subscribers, putting it on track to reach its target of 1.2 million by the end of 2003. XM and its rival, Sirius Satellite Radio, provide nationwide satellite-delivered music, talk and news channels in the US. Customers must buy a special receiver and pay a monthly fee to receive the services. Some automobile makers now provide XM or Sirius receivers in new cars as standard. Shares of both XM and Sirius both rose more than 5 percent in Monday morning trading.