Here's everything you need to know before Wednesday's opening bell:
- Walmart (WMT) plans to expand home delivery to more than 40% of U.S. households by end of year.
- Google (GOOGL) announced a ban of Bitcoin advertisements.
- Broadcom (AVGO) formally abandoned its pursuit of Qualcomm (QCOM) .
- Stephen Hawking died at 76.
- U.S. stock futures moved into the positive but remained on the edge.