Democratic presidential candidates, including Joe Biden, Elizabeth Warren and Bernie Sanders, have proposed a new tax on financial transactions. While candidates argue these new taxes could help pay for ambitious healthcare programs that could benefit the middle class, critics say they would suffocate retail stock traders.

Former Kase Capital Management hedge fund manager Whitney Tilson called out Paypal Holdings Inc (NASDAQ: PYPL) this week for practices that he said could leave the company vulnerable to a class action lawsuit.

When someone uses the words “green” and “cannabis” in the same sentence, they aren’t normally referring to how eco-friendly the cannabis industry is. And that’s an issue Especially for California — a state that is juggling increased flooding, droughts and raging wildfires. 

On CNBC's "Fast Money Halftime Report," Joe Terranova said there's more room on the upside for iShares Dow Jones US Medical Dev. (NYSE: IHI).