Today’s Top Stories: Samsung $80 Billion Buyback, Coinbase Rally and Nvidia Earnings Preview

Today's top stories: Samsung plans up to $80 billion in shareholder returns via dividends and buybacks. Ross Stores jumps nearly 9% after raising guidance. Coinbase rallies as Bitcoin climbs to its strongest level since late May. UBS raises S&P 500 target to 8,100. Nvidia's August 26 earnings report is upcoming.