Shake Shack Inc. made its public debut Friday in what could be the biggest restaurant company IPO ever.
The New York City-based fast-casual burger operator’s stock was in high demand before it even started trading Friday. The stock was priced late Thursday at $21 a share, well above the estimated range of $17 to $19 a share, enabling the company to raise $105 million.
The stock quickly jumped to more $50 a share in early trading, an increase of nearly 140 percent. The