Shake Shack is tumbling

shake shack

(Instagram / Shake Shack)

Shake Shack shares are tumbling.

In early trading Tuesday, the stock dropped by more than 6% to as low as $86.23 per share.

The fast-casual food chain had six straight days of gains until Friday, the longest such streak since its January 30 IPO. The stock is up 89% since the IPO.

The stock gained momentum after its first-quarter earnings results, which crushed expectations and which Stifel analysts called "a historically impressive 'beat and raise.'"

Here's a chart showing the slide Tuesday:

Screen Shot 2015 05 26 at 10.15.54 AM

(Google Finance)

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