US STOCKS-Wall Street weighed down by energy stocks
* Tyco jumps after deal to merge with Johnson Controls
* Caterpillar falls after Goldman slaps with "sell" rating
* Twitter down, 4 top executives to leave co
* Indexes down: Dow 0.47 pct, S&P 0.69 pct, Nasdaq 0.63 pct (Updates to late afternoon)
By Lewis Krauskopf
Jan 25 (Reuters) - Wall Street stumbled on Monday after its first positive week of 2016, pulled lower by further weakness in oil prices as energy shares led declines.
Oil prices fell more than 5 percent on concerns of oversupply after news that Iraq's output reached a record last month.
The S&P energy group dropped 3.2 percent, the worst performing sector. Exxon and Chevron were each off nearly 2 percent, while ConocoPhillips tumbled 7 percent after Barclays said the company should cut its dividend by at least 75 percent.
Wall Street is coming off its first week of gains in the year, with the three major indexes posting solid increases on Friday. Continuación...