09:20 AM EDT, 08/04/2026 (MT Newswires) -- Healthcare stocks were declining premarket Tuesday, with the iShares Biotechnology ETF (IBB) and State Street Health Care Select Sector SPDR ETF ( XLV ) down 0.1%.

Merck ( MRK ) shares were up more than 1% after the company posted an increase in Q2 sales and raised its 2026 sales outlook.

BioNTech (BNTX) stock was down more than 3% after the company reported a wider Q2 adjusted loss and lower revenue, and cut its 2026 revenue guidance.

IDEXX Laboratories ( IDXX ) shares were up more than 7% after the company raised its 2026 EPS outlook.