Some of the stocks that may grab investor focus today are:

• Wall Street expects Exelon Corporation (NASDAQ:EXC) to report quarterly earnings at $0.66 per share on revenue of $4.62 billion before the opening bell. Exelon shares rose 0.4% to $47.25 in after-hours trading.
• Allakos Inc. (NASDAQ:ALLK) posted a loss of $3.60 per share for the first quarter, versus a year-ago loss of $1.04 per share. Allakos shares dipped 5.6% to $3.21 in the after-hours trading session.
• Analysts are expecting Novavax, Inc. (NASDAQ:NVAX) to have earned $2.69 per share on revenue of $845.20 million for the latest quarter. The company will release earnings after the markets close. Novavax shares slipped 0.8% to $56.82 in pre-market trading.

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• Westport Fuel Systems (NASDAQ:WPRT) swung to a profit of $0.05 per share for the first quarter, versus a year-ago loss of $0.02 per share. Westport Fuel shares gained 3.4% to $1.23 in the after-hours trading session.
• Analysts expect BioNTech SE (NASDAQ:BNTX) to post quarterly earnings at $9.71 per share on revenue of $4.59 billion before the opening bell. BioNTech shares gained 1.7% to $138.50 in pre-market trading.