NEW YORK (Reuters) – U.S. stocks ended slightly lower on Wednesday as a drop in healthcare shares overshadowed a string of positive corporate earnings and upbeat economic data from the United States and China.

All three major U.S. stock indexes ended the session in negative territory, with the S&P 500 remaining just within a percent below its record high reached in September.

The healthcare sector saw its biggest percentage drop in four months, falling 2.9% on regulatory worries.

UnitedHealth Group Inc, Pfizer Inc, Merck & Co Inc and Abbott Laboratories all closed down between 1.9% and 4.7%, and were among the biggest drags on the broader S&P 500.

“Companies are worried about the attention ‘Medicare for all’ is getting,” said Jim Bell, president and chief