What you need to know on Wall Street today

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The hottest tech IPO of the quarter, Atlassian, just had a big pop out of the gate.

Atlassian began trading on Thursday at over $27 per share - up over 30% from the the starting price of $21.

In other news, Walmart is rolling out its own . The system, like Apple Pay, allows customers to purchase items using their smartphones.

An influential European startup investor told Business Insider that 'we're going to see some high-profile companies go bust' in 2016. And Jim Cramer told us about his 'vicious' daily routine which starts at 3:45 AM and doesn't end until after 11:30 PM.

Here are the top Wall Street headlines at midday -

Brazil's star hedge fund manager is killing it this year - but his tone is dark - Brazilian hedge fund manager Luis Stuhlberger, the founder of Verde Asset Management, is bearish on his home country.

CITI: The bond market is littered with landmines - Investors are going to have to tread carefully in the bond market.

A Tesla bull and a Tesla bear face off on the future of the car maker - Tesla's a polarizing company, and perhaps nowhere is that more evident than on Wall Street.

The Fed is going to raise rates for 2 reasons - Credit Suisse thinks there are two main motivations behind the Federal Reserve's imminent rate hike. And neither of them really matter.

GRANTHAM: Here are 12 ways people get America all wrong - People prefer good news over bad news. That bias is the theme of Jeremy Grantham's new quarterly message to GMO's clients.

FUND MANAGER: At this point, only one thing could tip the US into recession - The only thing that could throw the economy into a downturn in the short term is a catastrophic geopolitical event.

Here's what GE CEO Jeff Immelt means when he talks about the 'Industrial Internet' - General Electric has been working on remaking its image.

Yum to return $6.2 billion to shareholders before China separation - Yum Brands said it planned to return up to $6.2 billion to shareholders before completing the separation of its China business, which is expected by the end of 2016.

AIG CFO to leave in massive management shake-up - Insurer American International Group announced a shake-up on Thursday in an effort to simplify its operations and cut costs amid shareholder pressure.

Elsewhere on the web -