Some of the names on the move ahead of the open.
Brad Arthur, Black Rock Pharmacy co-owner, shares his take on the rising drug prices and the pharma supply chain.
Yellen and Fischer's comments at Jackson Hole leave markets right where they started the session.
Wall Street likes health care despite its vulnerability to political headwinds and underperformance this year.
U.S. equities closed lower Thursday, with health care falling approximately 1 percent.
Stocks closed lower, with health care shedding 1.5 percent, while investors eagerly awaited a speech from Janet Yellen.
Here's more evidence this summer's stock market rally is broad-based.
Officials have launched an investigation to see if providers may be steering patients into Obamacare plans.
As much as 55 percent of the country will have two or fewer Obamacare insurers to choose from.
The inquiry relates to people who are eligible for Medicare and Medicaid.
"Flash Boys" hero IEX will finally launch as a stock exchange on Friday.
The Fed's July minutes confirmed what the markets already believed - that a rate hike in September is unlikely.
The insurer had been asking for average rate hikes of more than 17% before its decision to exit.
Companies are also paying higher premiums, and having workers pay more in premiums, executives said.
Aetna's pullout is another blow to Obamacare that will usher in the "insurance death spiral," says think tank leader Sally C. Pipes.
Florida Blue has an advantage over big insurers like Aetna when it comes to Obamacare, CEO Patrick Geraghty says.
Patrick Geraghty, Florida Blue CEO, discusses why his company is staying with the Affordable Care Act amid Aetna's retreat from Obamacare, the high cost of health care and the future of Obamacare.
Aetna dropping Obamacare is another bad omen for the program, says consultant Robert Laszewski. But we can still make it work.
Brian Blase, senior research fellow on healthcare policy with George Mason University's Mercatus Center, and Dr. Ezekiel Emanuel, chair of medical ethics and health policy at University of Pennsylvania, discuss Aetna, Humana and United Health cutting Obamacare plans.
Aetna's decision to exit many Obamacare markets echoes similar moves by two other big insurers.