NEW YORK ( TheStreet) -- CHANGE IN RATINGS Barrick Gold ( ABX) was downgraded at Stifel Nicolaus to hold from buy. Company will be hurt by lower gold prices, Stifel Nicolaus said. Addvantage Technologies ( AEY) was downgraded to hold at TheStreet Ratings. Acuity Brands ( AYI) was downgraded at Canaccord Genuity to hold. $78 price target. Company still exhibits strong fundamentals and rising market share, but has reached its valuation limit, Canaccord Genuity said. Convergys ( CVG) was upgraded at Goldman Sachs to neutral from sell. $18 price target. Company can expand its margins, Goldman said. Quest Diagnostics ( DGX) was downgraded at Morgan Stanley to underweight from equal-weight. Price target is $58. Cuts to physician fee schedule will negatively impact future earnings, Morgan Stanley said. GLT) was downgraded at Deutsche Bank to hold from buy. Valuation call, based on a $26 price target, Deutsche said. Gentex ( GNTX) was downgraded at Robert Baird to neutral from outperform. Valuation call, Baird said. Helmerich & Payne ( HP) was downgraded at Jefferies to hold from buy. $71 price target. Industry will likely face higher CapEx budgets, Jefferies said. Hill-Rom Holdings ( HRC) was downgraded at Goldman Sachs to neutral from buy. $36 price target. Thesis will take longer to materialize than initially anticipated, Goldman said. Fresh Market ( TFM) was upgraded to buy at TheStreet Ratings. IBM ( IBM) was downgraded at Goldman Sachs to neutral from buy. $200 price target. Key markets may face increased pressure in the coming quarters, Goldman said. ISRG) was downgraded at Goldman Sachs to neutral from buy. $500 price target. Following preannouncement, upside case increasingly challenged, Goldman said. Intuitive Surgical was downgraded at Canaccord Genuity to hold. $444 price target. Confusion concerning contractions in ISRG's system placement business have widened disparity amongst consensus estimates, Canaccord Genuity said. Intuitive Surgical was downgraded at JMP Securities to market perform after failing to meet second-quarter estimates. Future estimates were also lowered. Kapstone Paper ( KS) was downgraded at Deutsche Bank to sell from hold. $38 price target. Valuation call, as the company trades at a premium to its peers, Deutsche Bank said.