Wall Street is going through another rough week and IT companies are feeling the full effect of the declining stock values. Our sample of 23 tech companies lost a combined $25.7 in market capitalization in the past seven days alone - $16.4 billion are contributed by Microsoft alone, which is now valued at just $164.2 billion. However, in terms of a percentage loss, chip makers are hit worst by what seems to be a perfect storm.

Compared to their 12-month highs, Nvidia has lost 83%, AMD 82% and Intel 55%. 19 of the 23 companies in our list have lost at least 50% in market capitalization over the past 12 months.

Especially noteworthy are Blackberry maker RIM, which is down 69% and is still rumored to be an acquisition target for Microsoft, Google, which is down 61% from more than $200 billion to 88.1 billion, Apple, which is down 68% to $77 billion as well as Seagate, which lost 86% and has a market capitalization of just $1.9 billion.

The best performing stock remains Oracle, which is now down 32%. The complete lists for November 19 and November 12 are below.

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