Key TakeawaysThe S&P 500 gained 0.3% on Monday, June 10, 2024, posting a new record closing high ahead of the Federal Reserve's interest rate meeting later this week.Southwest Airlines shares soared after an activist investor called for a shakeup of the company.Huntington Bancshares stock tumbled after its CFO said the regional bank expects its net interest income to decline more than previously forecast. Major U.S. equities indexes ticked higher to kick off a new trading week that will see the Federal Rese ...