One of the wildest first halves for stocks in recent memory is ending on a very high note. US stocks are barreling toward quarter-end with their best gains in years, thanks to a fresh rally driven by tailwinds ranging from ebbing US-Iran tensions to relentless enthusiasm for tech and AI. The major indexes traded mostly flat on Tuesday, but the Dow Jones Industrial Average remained on track to post a 8% gain for the first half of the year, which would mark the index's best first-half since 2021,