London's biggest stocks have outperformed most of Wall Street's major averages this year — and as the benchmark FTSE 100 index edges toward an historic milestone, market watchers say its rally could have further to run. The FTSE 100 index — home to the U.K.'s most valuable blue-chip companies — hit a record high of 9,930 points last week. Since then, a sell-off of global stocks , fueled by mounting concerns about AI valuations, has dragged the FTSE 100 below the 9,600 level. .FTSE YTD line FTSE 100 index Still, the index is only around 4.6% off of the 10,000-point threshold, and with a year-to-date gain of around 17%, it has outperformed the S & P 500 , the Nasdaq Composite and the Dow Jones Industrial Average . "The FTSE 100 is within a whisker of hitting 10,000 and it could only be a mat

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