Chart: Semiconductor Stocks Depending how you look at it, this may be one of the most bullish or bearish charts out there on US semiconductors… and by extension one of the most important charts for the US stockmarket right now. US Semiconductors’ market cap weighting has surged to record highs. It brings immediate comparisons to the dot-com spike, but equally immediate counterpoints on how the earnings weight has also soared — the mantra is: it’s different this time because it’s backed by earnings. But take a quick look at the chart… the dot com boom was backed by a surge in earnings weight too. So too was the lesser-known 1980’s semiconductor boom-bust cycle. This is a sector where boom and bust is the rule, not the exception (and a natural feature of disruptive tech adoption).