Here's a look at the biggest gainers in premarket trading: KeyCorp – The Cleveland-based regional bank's shares jumped 18 per cent after announcing it received a minority investment from Bank of Nova Scotia. The transaction gave Scotiabank 14.9% of KeyCorp's common stock and approximately $2.8 billion in cash. Starbucks — Shares of the coffee chain rose 2.2% after activist investor Starboard Value took a stake in Starbucks to boost its stock price, according to a Wall Street Journal report. Eli Lilly — The stock rose 1.4% after Deutsche Bank upgraded the stock to hold and buy. The bank cited Eli Lilly's recent earnings performance and called the stock a “low beta/high growth” unicorn. JetBlue Airways — Shares of JetBlue Airways fell nearly 6% after the airline announced plans to issue $400 million in convertible senior notes due 2029. Services stocks plunged nearly 10% as the company paid $1.71 billion in Maui storm and wildfire settlements. The company also reported a consolidated net loss of $1.3 billion in the second quarter, compared with a net profit of $55.1 million in the same period last year due to goodwill impairment charges. Robinhood – Shares of the online brokerage rose more than 1% after Piper Sandler upgraded the stock to overweight from neutral. In the long term, Robinhood will benefit from “the continued growth of global retail and derivatives trading” and “the generational wealth transfer from baby boomers to their children,” the company said. Qualcomm — Shares of Qualcomm fell more than 1% after Wolfe Research downgraded the chip maker to peer perform from market outperform. Apple's use of its own in-house modems will “eventually have an impact on Qualcomm,” the company said, adding that “premium Android is now normalized, and the growth of IoT… is likely to be more difficult for investors.” — CNBC's Fred Imbert, Jesse Pound, Sarah Min and Pia Singh contributed reporting.