Healthcare stocks rose Thursday afternoon, with the NYSE Healthcare Index and the State Street Health Care Select Sector SPDR ETF (XLV) each adding 1.6%.
The iShares Biotechnology ETF (IBB) advanced 1.3%.
In corporate news, Bio-Techne (TECH) shares surged nearly 20% after it said Thursday it has agreed to be acquired by Merck KGaA in an all-cash deal with an enterprise value of about $11.3 billion, as the German drugmaker aims to expand its presence in life sciences markets.