Nvidia buyback defies market selloff as Treasury yields hit new highs

U.S. stocks came under pressure on Tuesday as Treasury yields climbed to fresh highs. Rising yields make bonds more attractive compared to stocks, pulling money out of the market. Oil prices gave up earlier gains, adding to the cautious mood. Higher energy costs can fuel inflation, which keeps pressure on the Federal Reserve to hold interest rates high. One bright spot: Nvidia shares rose after the chipmaker announced a stock buyback. A buyback is when a company purchases its own shares, which can lift the stock price by reducing the number of shares available. Investors now wait for upcoming economic data for clues on the Fed's next move.