Yes. Having companions/summons will often reduce the XP you get because your "average party level" will be higher than usual, which tells the game that your enemies will be that much easier to defeat. Higher level companions/summons will increase the XP reduction, and lower level companions/summons will decrease the reduction, sometimes even to the point of increasing XP earned (ie. if your high level character summons a level 1 familiar).
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There more of it there is,<br />The less you see.
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