03:59 PM EDT, 10/10/2024 (MT Newswires) -- Health care stocks were lower late Thursday afternoon, with the NYSE Health Care Index and the Health Care Select Sector SPDR Fund (XLV) each shedding 0.4%.

The iShares Biotechnology ETF (IBB) eased 0.1%.

In corporate news, Gritstone Bio ( GRTS ) shares plunged 69% after the company said Thursday it filed for Chapter 11 bankruptcy.

BioNano Genomics ( BNGO ) shares dropped 12% after the company lowered its Q3 revenue guidance.

10x Genomics ( TXG ) shares tumbled 24% after the company overnight said preliminary results showed a revenue decline of about 1% year-on-year to roughly $151.7 million for Q3. Analysts polled by Capital IQ expected $162.3 million.

Pfizer ( PFE ) shares shed 2.8% after shareholder Starboard Value said in a letter Thursday it was urging the company's board to immediately form a special committee to probe an event that resulted in former Chief Executive Ian Read and former Chief Financial Officer Frank D'Amelio facing threats from "people within Pfizer ( PFE ) and/or their representatives."