07:52 AM EDT, 08/01/2024 (MT Newswires) -- ALX Oncology ( ALXO ) shares were down more than 33% pre-bell Thursday, extending Wednesday's fall.

Udemy ( UDMY ) stock was 19% lower after the company posted a wider Q2 adjusted net loss.

Teladoc Health ( TDOC ) shares were down 18% after the company reported weaker Q2 financial results.

Alphatec ( ATEC ) stock was nearly 18% lower following a 2.2% gain in the previous session.

Price: 3.1900, Change: -1.61, Percent Change: -33.54