Shake Shack shares are up 20% this week (SHAK)
Shake Shack is ripping higher.
After gaining another 8.4% on Wednesday, the stock is now up 20% this week.
Since reporting earnings after the close last Wednesday that beat expectations, the stock is up about 22%.
One analyst had already called the company's quarter a "historically impressive 'beat and raise.'"
The stock, which closed at a new record high of $82.85, has almost quadrupled since the company's initial public offering priced at $21 in January.
The only news surrounding the company Wednesday was the reopening of its flagship Madison Square Park location in New York City.
As for what this reopening could mean for the company, analysts at William Blair said it could weigh on Shake Shack's same-store sales performance in coming quarters.
In related Shack news, CNBC's Jim Cramer called the company a "Tesla for burgers" on his "Mad Money" program Monday night.
Here's the chart of Shake Shack's jump this week alone.
And the stock chart since its debut in January.