Marathon Oil (MRO)

The following table furnishes information concerning all persons known to Marathon to beneficially own five percent or more of the common stock of Marathon:

(1)          Based on Schedule 13G dated February 7, 2007 (filed: February 12, 2007) which indicates that Capital Research and Management Company had sole voting power over 9,640,000 shares, shared voting power over no shares, sole dispositive power over 35,022,610 shares and shared dispositive power over no shares.

(2)          Based on Schedule 13G dated January 31, 2007 (filed: January 23, 2007) which indicates that Barclays Global Investors, NA is the beneficial owner of shares and had sole voting power over 26,274,586 shares, shared voting power over no shares, sole dispositive power over 29,816,370 shares, and shared dispositive power over no shares. According to such Schedule 13G, (i) Barclays Global Investors, NA is the beneficial owner of 22,859,547 shares and has sole voting power over 19,319,796 shares, shared voting power over no shares, sole dispositive power over 22,859,547 shares, and shared dispositive power over no shares, (ii) Barclays Global Fund Advisors is the beneficial owner of 2,417,416 shares and has sole voting power over 2,415,383 shares, shared voting power over no shares, sole dispositive power over 2,417,416 shares, and shared dispositive power over no shares, (iii) Barclays Global Investors, Ltd. is the beneficial owner of 3,208,627 shares and has sole voting power over 3,208,627 shares, shared voting power over no shares, sole dispositive power over 3,208,627 shares, and shared dispositive power over no shares, (iv) Barclays Global Investors Japan Trust and Banking Company Limited is the beneficial owner of 408,068 shares and has sole voting power over 408,068 shares, shared voting power over no shares, sole dispositive power over 408,068 shares, and shared dispositive power over no shares, and (v) Barclays Global Investors Japan Limited is the beneficial owner of 922,712 shares and has sole voting power over 922,712 shares, shared voting power over no shares, sole dispositive power over 922,712 shares, and shared dispositive power over no shares.

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