Caterpillar declines sharply, levels to watch The shares are down 3.5% to $101.73 at time of writing, close to session lows. At current price the stock is very close to its 50-day moving average. That moving average has been the uptrend support line, a close proxy for a hand-drawn uptrend line, since December of last year. A breakdown below the 50-day would therefore be bearish. Support below the 50-day is at $100 and then at $98.94. Resistance is at $103.38.