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* Apple rises as JP Morgan lifts shipment volume forecast
* Mallinckrodt up on opioid settlement with Ohio counties
* UnitedHealth slips after downgrade from BMO Capital Markets
* Indexes up: Dow 0.32%, S&P 0.40%, Nasdaq 0.42% (Updates to open)
By Medha Singh
Sept 30 (Reuters) - Technology stocks led by Apple lifted Wall Street's main indexes on Monday, as investors looked past last week's reports that Washington was considering delisting Chinese companies from U.S. stock exchanges.
Apple Inc rose 1.3% as Chief Executive Officer Tim Cook told a German daily, Bild, that iPhone sales were off to a strong start, and JP Morgan raised its iPhone shipment volume forecast. Microsoft Corp climbed 0.4%.
The technology sector gained 0.6%, the most among 11 major S&P sectors. Only energy stocks were in the red, tracking a drop in oil prices.
Still, the main indexes were on course to end the quarter with their worst performance so far this year, with sentiment swinging wildly due to developments in the U.S.-China trade war and mixed indications from domestic economic data.
Reports about the United States curbing Chinese companies' access to U.S. capital markets sparked a sell-off on Friday, with the S&P 500 and Nasdaq hitting a more than three-week low during the session.
However, on Monday, White House trade adviser Peter Navarro dismissed the reports as "fake news."
"If the U.S. goes down this road, it could have some serious repercussions," said Robert Pavlik, chief investment strategist at SlateStone Wealth LLC in New York.
"It could possibly lead to the Chinese selling U.S. Treasuries and could put pressure on the Treasury market, so it needs to be well thought out before being executed."
China was the second largest owner of U.S. Treasuries in July, behind Japan, but its holdings were the smallest since April 2017.
U.S.-listed shares of Alibaba Group Holding Ltd, Baidu Inc and JD.com Inc were up between 1% and 2.2%.
The third quarter witnessed an escalation in U.S-China trade tensions, the inversion of an important part of the U.S. yield curve, a second U.S. interest rate cut and political turmoil in Washington.
The S&P 500 and Dow are on track for their smallest percentage gain in three quarters, with the Nasdaq heading for a marginal decline. The benchmark index is now about 2% away from its record high hit in July.
At 9:55 a.m. ET, the Dow Jones Industrial Average was up 85.32 points, or 0.32%, at 26,905.57, the S&P 500 was up 11.84 points, or 0.40%, at 2,973.63. The Nasdaq Composite was up 33.48 points, or 0.42%, at 7,973.11.
In a bright spot, Newell Brands jumped 3.5% after SunTrust Robinson Humphrey upgraded the household goods maker to "buy" and said it expected the company's turnaround process to continue well in 2018.
Drugmaker Mallinckrodt rose 1.8% after finalizing a settlement with Cuyahoga and Summit counties in Ohio in connection with opioid-related lawsuits.
Advancing issues outnumbered decliners by a 1.52-to-1 ratio on the NYSE and a 1.55-to-1 ratio on the Nasdaq.
The S&P index recorded 10 new 52-week highs and no new lows, while the Nasdaq recorded 12 new highs and 52 new lows. (Reporting by Medha Singh and Shreyashi Sanyal in Bengaluru; Editing by Arun Koyyur)