HPE lifted its long-term growth targets after revenue gains across both of its segments drove a more than fivefold increase in its profit during the third quarter. HPE also announced an expansion of Oracle's collaboration with Juniper Networks, a company HPE acquired last year. However, shares were down 5.3% at $49.08 after market close.

Five Below raised its guidance for the year again as the discount retailer sees a boost from new, trendy products. The updated outlook marks the second time Five Below has raised its guidance for this year, and comes after the company reported a 23% increase in sales in the second quarter, topping Wall Street's forecast. The stock rose 5.1% to $255.50 in late trading.

Petco Health and Wellness's second-quarter profit more than doubled as the company sees its turnaround plan gaining traction. Chief Executive Joel Anderson pointed to growth in consumables, a metric he said shows the company's strategy is gaining momentum. Shares were up 8% at $2.84 after hours.

Nyxoah said a U.S. study of its obstructive sleep apnea device met all primary safety and efficacy endpoints in patients with complete concentric collapse of the soft palate. The stock gained 32% to $2 in late trading.