Stocks edge lower, Apple iPhone ban, TSMC, Zscaler, GameStop

^{Five things you need to know before the market opens on Wednesday September 6:}

1. -- Stocks slip lower, oil prices ease, as global growth concerns persist

Investors remain focused on global growth prospects, as well as the U.S outperformance, with markets tracking higher Treasury yields and robust oil prices.

2. -- Apple slips lower on report of China government iPhone ban

In what could be the latest salvo of the tech trade war between Washington and Beijing, reports suggest government officials are banning workers from using Apple iPhones.

3. -- TSMC says it will decide on Arm IPO investment over the coming days

TSMC, the world's biggest contact chipmaker, called SoftBank-owned Arm 'an important element of our ecosystem'.

4. -- Zscaler shares lower as muted cloud security outlook mars Q4 earnings

Cybersecurity group Zscaler firmly topped Wall Street's fourth quarter earnings forecast, but sees slower revenue growth over the coming year.

5. -- GameStop earnings on deck as C-suite exodus raises strategy concerns

GameStop, the meme stock video game retailer which has had five different CEOs over the past five years, will publish its second quarter earnings after the close of trading.