The bull market in U.S. stocks is now the longest on record.The current bull run on Wall Street became the longest in history on Wednesday at 3,453 days, beating the bull market of the 1990s that ended in the dot-com collapse in 2000.That’s how long the benchmark S&P 500 index of major U.S. stocks has gone without a drop of 20 percent or more, the traditional definition of a bear market.Despite its long duration, this bull market actually wasn’t as big in terms of overall gains as the 1990s one.The milestone arrived on a listless day of trading that left the S&P 500 with a slight loss. Gains by technology and energy companies outweighed losses in industrial stocks, banks and other sectors.“This expansion is alive and well, this bull market is alive and well,” said Jason Pride, chief investment officer for private clients at Glenmede. “Valuations are definitely higher than we tend to like to see them, but they’re actually not that atypical for the back part of an economic expansion.”The S&P 500 index finished with a loss of 1.14 points, or 0.04 percent, at 2,861.82. The Dow Jones Industrial Average slid 88.69 points, or 0.3 percent, to 25,733.60. The Nasdaq composite gained 29.92 points, or 0.4 percent, to 7,889.10.