US STOCKS-Wall St retreats but S&P, Nasdaq post quarterly gains
* Oil prices weaken for third straight day
* Charter to buy Bright House for about $10 bln
* Nasdaq in longest-ever streak of quarterly gains
* Dow down 1.1 pct, S&P 500 down 0.9 pct, Nasdaq down 0.9 pct (Updates to close)
By Caroline Valetkevitch
NEW YORK, March 31 (Reuters) - U.S. stocks ended down on Tuesday in a retreat from the previous session's sharp rally as energy shares declined and the dollar edged up, but the S&P 500 and Nasdaq registered their ninth straight quarterly rise.
The S&P's 500 quarterly winning streak was its longest since 1998, while the Nasdaq's was its longest ever. The Dow registered a slight loss for the quarter.
In the day's action, energy shares were among the biggest drags as crude oil fell. The S&P Energy index declined 0.9 percent, while shares of Exxon Mobil Corp fell 0.7 percent to $85.
Oil was pressured as Iran and six world powers continued talks on a nuclear deal that could see the energy-rich country increase oil exports. Continuación...