BERKSHIRE HATHAWAY INC bought OXY

Footnotes

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $56.9200 to $57.9199. The Reporting Persons undertake to provide Occidental Petroleum Corporation ("Occidental"), any security holder of Occidental, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote 1 to this Form 4.; The shares of the issuer's common stock reported on this form are held by Berkshire Hathaway Inc. ("Berkshire") indirectly through its subsidiary, National Indemnity Company.; As Berkshire is in the chain of ownership of each subsidiary listed, it may be deemed presently to both beneficially own and have a pecuniary interest in all shares and derivative securities, as applicable, presently directly owned by such subsidiaries. Warren E. Buffett, as the controlling stockholder of Berkshire, may be deemed presently to beneficially own, but only to the extent he has a pecuniary interest in, the shares and derivative securities, as applicable, presently owned by each of these subsidiaries. Mr. Buffett disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. In addition, in order to avoid double counting, all shares and derivative securities, as applicable, reported as being owned by each subsidiary listed only reflect shares or derivative securities, as applicable, that are owned directly by such subsidiary,; (Continued from footnote 3) and do not reflect any shares that such subsidiary may be deemed to beneficially own by virtue of ownership or control of any other subsidiary otherwise reported on this form.