US STOCKS-Indexes hold onto meager gains; energy stocks rise
* Energy stocks helped by Saudi move to stabilize prices
* Pfizer, Allergan drop after biggest-ever healthcare deal
* Alcoa up as Elliott takes stake
* Indexes up: Dow 0.02 pct, S&P 0.19 pct, Nasdaq 0.28 pct (Updates to early afternoon)
By Abhiram Nandakumar
Nov 23 (Reuters) - U.S. stock indexes held onto meager gains in lackluster early-afternoon trading on Monday in the run-up to Thursday's Thanksgiving holiday.
Energy stocks rose with crude prices after Saudi Arabia agreed to cooperate with other oil producers to stabilize prices.
The S&P energy sector was up 0.8 percent, led by Exxon and Chevron, which rose 0.8 percent and 1.3 percent respectively.
Pfizer's shares were down 2.1 percent at $31.51, after the company said it would buy fellow drugmaker Allergan in a deal valued at about $160 billion, the biggest ever in the healthcare sector. Continuación...