What you need to know on Wall Street today

President Donald Trump unexpectedly fired FBI Director James Comey on Tuesday. Not even Comey saw it coming. He reportedly found out, like many other people, via headlines on television.

Trump's firing of FBI Director Comey has huge implications for stocks, and it's a "perfect example" of what Wall Street fears most about Trump.

Even Ray Dalio, the founder of Bridgewater, weighed in. "Heroes typically get crucified or martyred in the end," he said.

In other news, there's one big trading company that's loving all this uncertainty. A $30 billion hedge fund's market-making arm just made a big purchase.

fleet of Democratic senators called on the SEC and others to investigate Carl Icahn for "possible insider trading."

A 233-year-old Wall Street giant has developed an army of robots. Jesse Eisenberg will star in a film about the traders that have been vilified on Wall Street. The equity chief at one of Wall Street's biggest firms shared his best piece of investing advice.

And hundreds of investors say these 10 finance books are must-reads.

A nightmare scenario is beginning for Ford and General Motors. Abercrombie is putting itself up for sale. And t

Millennials are taking "big shots" on speculative stocks and selling Whole Foods and Yahoo. They're also winning big with Nvidia, which is up again after beating on earnings.

Elsewhere in tech news:

Apple just became the first company in the US to cross $800 billion in market capitalization
Apple just bought a company that tracks your sleep
APPLE EXPERT: "Transportation is Apple's future"
One of the biggest questions ahead of Snap's first earnings call is whether its CEO will show up
Yelp crashes 28% after missing on revenue and slashing guidance
Disney beats on earnings, misses on revenue amid weakness at ESPN
ELON MUSK: Tesla is beginning solar roof orders today

Lastly, here's what it's like to take a $400,000 Rolls-Royce Dawn convertible on a road trip through New Jersey.