Google has made a large scale update to how they index securities for Google Finance.

A Google Web Search Help thread has a response from a Googler named Albert who said:

This was in response to a complaint about how Google handled a specific stock. But now, it seems Google fixed the issue because of the new way they index securities.

I am not sure exactly what they changed but Google said it was a “large scale” change to the way they “index” the securities.

Forum discussion at Google Web Search Help.