FACTBOX-S&P 500 companies most exposed to China

April 4 (Reuters) - Shares in U.S. makers of everything fromplanes to semiconductors fell on Wednesday after Chinaretaliated against the Trump administration's tariff plans,putting a number of large U.S. companies at risk of fallout froman escalating trade war. China hit back against U.S. President Donald Trump's plansto impose tariffs on $50 billion in Chinese goods with similartariffs on U.S. goods, even as Trump said the country is "not ina trade war with China." Among the most affected by a trade war could be the U.S.technology sector, particularly chipmakers, many of which haveseen their shares tumble this month as Trump took aim at China. S&P 500 semiconductor companies rely on China for about 24percent of their revenue, according to Thomson Reuters data.Customers and licensees in China accounted for close to 60percent of Qualcomm's revenue last year, according to acompany filing. The following are the S&P 500 companies and sectors with thehighest revenue exposure to China, according to Thomson Reutersdata, some of which is estimated: Company Revenue Share price from China change in March Skyworks Solutions 83 pct -11 pct Wynn Resorts 73 pct 6 pct Qualcomm 65 pct -18 pct Broadcom 54 pct -6 pct Micron Technology 51 pct 6 pct A. O. Smith 35 pct -2 pct Advanced Micro Devices 33 pct -21 pct Amphenol 29 pct -8 pct Texas Instruments 28 pct -6 pct Xilinx 25 pct -3 pct Source: Thomson Reuters data Industry Estimated revenue from China Semiconductors & 24 pct Semiconductor Equipment Household & Personal 10 pct Products Technology Hardware & 8 pct Equipment Automobiles & Components 7 pct Materials 7 pct Software & Services 7 pct Source: Thomson Reuters data (Reporting by Noel Randewich, editing by G Crosse)