Investors in the behemoth SPDR technology sector fund might be surprised to learn that until last week their exposure to Nvidia was roughly four times that of Apple, despite their comparable market values.  That disparity was costly for shareholders of the $70 billion State Street fund because Apple stock has outperformed Nvidia by 10 percentage points in the third quarter. And, it forced S&P Dow Jones Indices to tear up its rulebook to account for the growing might of the biggest tech companies.Ticker Secu ...