The herd is riding on the EDA vendors, almost all of which are at or near 52-week high share prices.

In the past week, Cadence, Mentor and Synopsys hit or were trading just pennies off their yearlong highs. National Instruments and Ansys both traded much closer to their highs than their lows. Even Altium closed in on a high, but that’s a bit deceiving because it’s a penny stock and lightly traded on the Australian exchange.

So, is it the investor herd driving up an industry? Or is it a sign that the EDA market, which topped $5 billion for the first time in 2011, is geared up for a sustained run?