An explosive start to the trading day for Wendy's meant that trading of the fast-food chain's stock needed to be halted multiple times during the day.

By the numbers: After trading at $6. 25 the previous night, Wendy's stock opened Wednesday morning more than a dollar and a half higher at $7. 84 per share.

Ten minutes later, the stock price jumped another dollar to $8. 84, or 41% higher than it was Tuesday night.