(Updated with additional information and stock price movement.)NEW YORK ( TheStreet) -- A wealth of healthy buying in recent weeks led a variety of blue chips to hit fresh 52-week highs on Monday, including technology darling Apple ( AAPL) and Dow Jones industrial average components Caterpillar ( CAT), Du Pont ( DD) and Kraft Foods ( KFT). Jim Cramer told the viewers of his "Mad Money" TV show last week the 52-week high list tells us everything we need to know about the market, though it's not the number of companies hitting 52-week highs that's important, it's the number of industries represented on the list. >>Cramer's 'Mad Money' Recap: 52-Week High Breakout He explained that just a month ago, there were only three industries on the list, and they represented people's fears of the market. But today, there's an astounding 25 different industries rpresented, a diverse swath of our economy. Ranked by volume, the most heavily-traded stock to hit a fresh 52-week high Monday was L-1 Identity Solutions ( ID), holding steady in afternoon trading around $11.65.