No. 2 on the list is transportation supplier CSX Corporation.

FORBES: The Top Military Friendly Employers

One of the recent additions to the list is car parts supplier Continental which has been in a protracted, yet-to-be completed merger with Schaeffler.

FORBES: Time To Play The European Takeover Game?

Another three companies will list today: Shandong Longquan Pipeline Engineering, a pipe manufacturer, AoKang Shoes, a footwear supplier whose boss Wang Zhentao is a former China Rich List member, and Dongjiang Environmental Company, a waste management company traded in Hong Kong that has arranged a secondary listing in Shenzhen.

FORBES: Lujiazui Breakfast: News And Views About China Stocks -- April 26

That may seem like a no-brainer for a supplier responsibility report, but until now, Apple has kept the list secret, citing confidentiality concerns.

FORBES: Is This Apple's Nike Moment?

This list includes beleaguered chip maker Advanced Micro Devices, software giant Autodesk, and its own supplier BMC Software.

FORBES: Apple's Cash: What Could It Buy? (Part II)