US STOCKS-S&P ends near flat as Citigroup results sink banks; Nasdaq hits new high

* Boeing drops on report 737 MAX groundings could extend to 2020

* Symantec tumbles on report of end to Broadcom deal talks

* Healthcare shares gain on Gilead investment

* Indexes higher: Dow 0.1%, S&P 0.02%, Nasdaq 0.17% (Updates to market close)

By April Joyner

NEW YORK, July 15 (Reuters) - The benchmark S&P 500 index ended little changed on Monday after oscillating between positive and negative territory throughout the session after Citigroup Inc kicked off the earnings season with a mixed quarterly report.

The bank reported a better-than-expected profit but also a decline in its net interest margin. The fall in net interest margin triggered a fall in shares of other banks on concerns that it would presage lower profits across the industry as interest rates have dropped.

Though Citigroup shares erased nearly all their losses to end just 0.1% lower, the S&P 500 bank index slid 1.0%. Shares of JPMorgan Chase & Co, Goldman Sachs Group Inc and Wells Fargo & Co - all set to report results on Tuesday - declined more than 1%.

As a result, financial shares fell 0.5% to weigh most heavily on the S&P 500 among its 11 major sectors.

Gains in technology and healthcare shares offset the losses in financial shares, however. Those sectors helped the Nasdaq edge higher to notch its fourth consecutive record closing high.

Second-quarter earnings start in earnest this week, and analysts expect S&P 500 companies to report a 0.3% fall in profit, which would be the first quarterly drop in three years, according to Refinitiv IBES data.

U.S. stocks will likely be muted until more results come in, said Oliver Pursche, chief market strategist at Bruderman Asset Management in New York. The three main indexes ended last week at record closing highs as dovish comments from Federal Reserve Chairman Jerome Powell bolstered hopes the central bank would cut interest rates later this month.

"It's definitely a wait-and-see environment," Pursche said. "Citi was looked at as slightly disappointing."

Yet solid earnings could give U.S. stocks a further boost, said Lamar Villere, portfolio manager of the Villere Balanced Fund in New Orleans.

"We think earnings are going to be generally positive this season," he said. "We've been on a tear this year, but we still have some room to go."

The Dow Jones Industrial Average rose 27.13 points, or 0.1%, to 27,359.16, the S&P 500 gained 0.53 point, or 0.02%, to 3,014.3 and the Nasdaq Composite added 14.04 points, or 0.17%, to 8,258.19.

Gilead Sciences Inc shares rose 2.7%, helping to boost the S&P 500 healthcare index, as the drugmaker said it would invest $5.1 billion in a major expansion of its partnership with biotech Galapagos NV.

Boeing Co shares slipped 1.0% following a Wall Street Journal report https://www.wsj.com/articles/boeing-737-max-grounding-could-stretch-into-2020-11563112801 on Sunday that its 737 MAX jet could stay grounded until early 2020.

Symantec Corp shares tumbled 10.7%, the biggest percentage drop among S&P 500 companies, after a report that the cybersecurity company and Broadcom Inc have ceased deal talks. Broadcom shares rose 1.0%.

Advancing issues outnumbered declining ones on the New York Stock Exchange by a 1.04-to-1 ratio; on the Nasdaq, a 1.06-to-1 ratio favored decliners.

The S&P 500 posted 66 new 52-week highs and two new lows; the Nasdaq Composite recorded 77 new highs and 64 new lows.

Volume on U.S. exchanges was 5.39 billion shares, compared with the 6.69-billion-share average for the full session over the last 20 trading days. (Reporting by April Joyner; Additional reporting by Evan Sully in New York and Medha Singh and Uday Sampath in Bengaluru; Editing by Chizu Nomiyama and Jonathan Oatis)