* Twitter jumps on addition to S&P 500 index
* Financials, healthcare lag on S&P, Dow
* Amgen drops as Mylan gets approval for biosimilar
* Dow down 0.14 pct, S&P flat, Nasdaq up 0.23 pct (Updates to early afternoon)
By Medha Singh
June 5 (Reuters) - Declines in financial and healthcare stocks weighed on the S&P 500 and Dow on Tuesday, while strong gains in tech heavyweights lifted the Nasdaq to a record intra-day high.
Amazon rose 1.2 percent and Apple edged up 0.6 percent, leading gains in the S&P consumer discretionary index and technology index, the top gainers among the major S&P sectors so far this year.
Another bright spot was Twitter, whose shares jumped 5.2 percent after the social media company joined the benchmark S&P 500 U.S. index, while Netflix rose 1.2 percent after entering the S&P 100 index.
Still, investors are wary about trade discussions, with Mexico on Tuesday imposing wide-ranging tariffs on American products ranging from steel to pork and bourbon in response to U.S. President Donald Trump's metals tariffs.
Shares of U.S. food companies Kellogg and General Mills fell more than 2 percent, while shares of AK Steel and US Steel also dropped about 1.5 percent.
White House economic adviser Larry Kudlow said Trump may seek separate talks with Canada and Mexico in a bid to get individual trade deals with the two countries.
"We're in a trading range, a lot of that has to do with the fatigue factor of investors trying to digest multiple macro news, ranging from Italian elections to tariff talks," said Matt Lloyd, chief investment strategist at Advisors Asset Management in Monument, Colorado.
"With the fundamentals, everything that you see right now is better for the long term, but a lot of investors are cautious if this is going to continue."
U.S. services sector activity accelerated in May, pointing to robust economic growth in the second quarter, while another set of data showed job openings rising to a record high in April, far outpacing hiring.
At 13:12 ET, the Dow Jones Industrial Average was down 34.48 points, or 0.14 percent, at 24,779.21, the S&P 500 was unchanged at 2,746.87 and the Nasdaq Composite was up 17.42 points, or 0.23 percent, at 7,623.88.
Bank of America, JPMorgan and Goldman Sachs dropped more than 0.7 percent, dragging the S&P financial index down more than 0.5 percent.
Amgen fell 2.3 percent and pulled the S&P healthcare index lower after Mylan got regulatory approval for a biosimilar.
Advancing issues outnumbered decliners for a 1.17-to-1 ratio on the NYSE and for a 1.39-to-1 ratio on the Nasdaq.
The S&P index recorded 44 new 52-week highs and eight new lows, while the Nasdaq recorded 195 new highs and 27 new lows. (Reporting by Medha Singh in Bengaluru; Editing by Shounak Dasgupta)