Goldman Sachs analyst George Tong downgraded Nielsen Holdings to Sell from Neutral and cut his price target for the shares to $28 from $35. Sustained operating headwinds in developed Consumer Packaged Goods markets will keep the company's Buy segment revenue growth under pressure over the near-to-intermediate term, Tong tells investors in a research note. Further, the analyst expects Nielsen's investment activities to weigh on its EBITDA margin performance over the next two-to-four quarters. As such, Tong sees risk of downward revisions to earnings and free cash flow estimates.