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Webwork - 1:59 pm on Jan 29, 2012 (gmt 0)
Perhaps there's a "brand subroutine" to the ranking algo triggered by brand signature queries? If your site doesn't have strong brand signals then there's less weight assigned to your homepage. If your company "is a brand" then weight is added to the ranking of the home page.
What, then, are the "signals of a brand"?