Under Armour Inc (UAA) stock plummeted to close down almost 7% Thursday after Eagle Alpha analyst Brendan Furlong said the company's search interest continued in a "steep downtrend" since inflecting down in September.

Under Armour "does appear to be seeing much greater weakness in search interest" than its peers in the performance apparel industry, Furlong said.

Furlong said a continued downward trend in search interest could signal a threat to Baltimore-based Under Armour's revenue growth rates in current or future quarters. The company is set to report second quarter earnings July 25.

Under Armour shares have fallen 29% since the start of the year.

What's Hot On TheStreet

Apple is OK for the time being: For those silently worrying how the Apple (AAPL) iPhone 8 will sell, simmer down -- the tech giant still has several huge advantages. On the hardware side, for instance, the iPhone still feels ahead of the pack thanks not only to Apple's design skills and the visible features of its hardware, but also what's under the hood points out TheStreet's tech columnist Eric Jhonsa. From the looks of things, the iPhone 8 should extend that lead, Jhonsa predicts.

Tesla is looking wobbly: Tesla (TSLA) shares are looking a little shaky (again) after its Model S didn't get a top rating from Insurance Institute for Highway Safety (IIHS), reports TheStreet's James Skinner. The IIHS cited issues with the small overlap front test, which is meant to simulate crashes into trees, poles and other vehicles, as why the Model S did not receive the highest rating. IIHS Executive Vice President David Zuby said the front test remains a "hurdle" for some vehicles.

"Tesla made changes to the safety belt in vehicles built after January with the intent of reducing the dummy's forward movement," IIHS said. "However, when IIHS tested the modified Model S, the same problem occurred, and the rating didn't change."

Costco finally scores some good news: After watching its stock crash about 13% inside a month thanks to fears Amazon (AMZN) and Whole Foods (WFM) will dominate society, Costco (COST) scored a nice win. Costco said same-store sales in June rose 6.5% in June. Canada saw sales up 3.2%, while international sales rose 6.2%.

The numbers should serve as a reminder how resilient Costco's business has been in the face of Amazon's rise.

Apple is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL? Learn more now .

Visit here for the latest business headlines.

More from Stocks

Starbucks Shares Gain as Investor Day Highlights China Growth Ambitions

Starbucks Shares Gain as Investor Day Highlights China Growth Ambitions

Chart of the Day: There are Better Bargains Out There Besides GE

Chart of the Day: There are Better Bargains Out There Besides GE

Tesla Stock Flirts With Breakout After Big Price-Target Bump

Tesla Stock Flirts With Breakout After Big Price-Target Bump

Twitter Stock Looks Ready to Take Flight

Twitter Stock Looks Ready to Take Flight

Stocks Showing Volatility Heading Into Close

Stocks Showing Volatility Heading Into Close