Here's what is happening in the markets today, Tuesday, August 17th:

- S&P 500 doubled since pandemic lows, the fastest bull-market doubling since World War II

- Stock index futures point to a lower open
- Reason: Worry about economic impact of Delta Variant

- Home Depot (HD) fell 3.5% in premarket trading after reporting second-quarter results

- Walmart (WMT) is 1.2% lower in premarket trading after reporting earnings

- Vaccine: U.S. is expected to recommend Covid vaccine booster shot 8 months after second dose

- Spirit Airlines (SAVE) lost 4.4% in premarket action 

- Tesla (TSLA) shares dropped 4.3%, after National Highway Traffic Safety Administration opened a formal safety probe into Tesla’s autopilot system

- The Big Short icon Michael Burry is betting against Cathie Wood's ARKK.

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