Stocks making the biggest moves midday:

$Coinbase(COIN.US)$ — Shares of the cryptocurrency exchange jumped about 15% after the company announced a partnership with BlackRock, the world's largest asset manager, that will allow its institutional clients to buy bitcoin. The ticker COIN also became one of the most mentioned names on Reddit's WallStreetBets forum, according to Quiver Quantitative. Earlier in the day, the stock soared as much as about 40%.

$YETI Holdings(YETI.US)$ — Yeti shares fell roughly 17% after the vacuum-insulated drinkware maker reported earnings that missed expectations. Yeti said its direct-to-consumer sales were softer than expected.

$AMTD Digital(HKD.US)$ — The Hong Kong-based fintech company's ADRs dropped 43% as the speculative rally driven by retail investors fizzled. The name was caught in a trading mania over the past week with the ticker trending on social media platforms. Despite the back-to-back sell-off, the stock is still up 7,800% from its IPO price of $7.8 from mid-July.

$Crocs(CROX.US)$ – Shares of Crocs slumped 13% despite the shoe company beating expectations on the top and bottom lines. Crocs shared light revenue guidance for the third quarter. The shoe company also trimmed guidance for the full year.

$Shake Shack(SHAK.US)$ — Shares dropped nearly 8% after the restaurant chain reported quarterly results that missed on revenue expectations. Shake Shack said a slowdown in return to work plans hurt results.

$Restaurant Brands International(QSR.US)$ — The parent company of Burger King, Tim Hortons and Popeyes surged more than 6% Thursday after the company reported better-than-expected earnings before the bell. Global same-store sales grew by 9%, fueled by the performance of Burger King and Tim Hortons.