The complex telemedicine-coverage rules are leading to confusion—and the cost-sharing charges create concern that patients, faced with an increased financial burden for telehealth, might delay or avoid visits, doctors and hospital officials say.

Data-firm Palantir and Asana were the first two major companies to do a direct listing since Slack and Spotify.

The lawmakers are expected to call on Congress to blunt the power of technology companies, possibly through forced separation of online platforms.

Many investors attribute the strong performance to an economy that has steadily improved—though it remains far from where it was to start the year—as well as a powerful surge in big technology stocks.