FACTBOX-Top S&P 500 companies exposed to China

March 21 (Reuters) - Investor worries about a trade war between the United States and China ratcheted up on Wednesday, leaving a number of large U.S. companies potentially in the crosshairs of a dispute because of their business with China. The tariffs on steel and aluminum imports proposed on March 1 and signed into law by U.S. President Donald Trump on March 8 have sparked concerns of a global trade war and frayed investors' nerves. Trump will likely announce tariffs on Chinese imports by Friday, a source in the administration said, as the top U.S. trade diplomat told lawmakers he had the tools to strike back over Chinese theft of U.S. technology know-how. A report in the Wall Street Journal said China was planning counter-measures against U.S. tariffs. Among the most affected could be the technology sector, particularly semiconductor companies, which have high revenue exposure to China, according to UBS. Shares of U.S. exporters of agricultural products such as soybeans and meat slipped on Wednesday. The Journal report said China was preparing tariffs targeted at U.S. agriculture exports. Other business areas with companies that have high revenue exposure include the life-science tool industry and the consumer discretionary sector. The following are the S&P 500 companies with the highest revenue exposure to China, according to UBS and FactSet data, as well as U.S. industries with the biggest imports from and exports to China:

S&P 500 company Revenue from Share performance

China (est.) since Feb. 28

Skyworks Solutions 80.0 pct -0.7 pct Qualcomm 63.3 pct -14.4 pct Qorvo 60.0 pct -8.8 pct Broadcom 51.9 pct -0.2 pct Micron Technology 49.5 pct 20.1 pct Texas Instruments 42.9 pct 0.3 pct A.O. Smith 33.4 pct 2.2 pct Microchip Technology 31.0 pct 10.4 pct Amphenol 28.6 pct -0.4 pct Expeditors International 26.5 pct -1.4 pct

of Washington Source: FactSet and UBS

Top importers from China 2017 imports

(blns of $)

Communications Equipment $78.0 Computer Equipment $58.6 Misc. Manufactured $36.5

Commodities

Apparel $24.6 Semiconductors $23.2 Top exporters to China 2017 exports

(blns of $)

Aerospace Products and $16.3

Parts

Agricultural Products $15.9 Motor Vehicles $10.1 Semiconductors $6.9 Oil & Gas $6.9

Imports/exports data source: U.S. Census Bureau, Haver, UBS

(Reporting by Lewis Krauskopf, April Joyner and Caroline Valetkevitch; Editing by Peter Cooney)