NEW YORK (TheStreet) -- RATINGS CHANGES Apple was upgraded to buy from outperform at CLSA. Twelve-month price target is $695. Earnings momentum poised to accelerate with 300 million-plus iPhone installed base upgrade cycle, CLSA said. Altera was downgraded to hold at TheStreet Ratings. Athlon Energy was upgraded at Miller Tabak to buy. Twelve-month price target is $50.