n EX-99.1.

Changes in Affiliates (Addition)

1. Company to be affiliated
— Company Name: POSCO MEXICO Human Tech S.A. de C.V.
— Total Asset (KRW) : 4,254,930
— Total Equity (KRW): 4,254,930
— Total Liabilities (KRW): —
— Total Capital (KRW): 4,254,930
— Purpose of the company : service providing

2. Name of Company Group: POSCO

3. Reason for Addition: Incorporation of a new corporation

4. Total number of affiliated companies after additional affiliation: 77

5. Date of Addition: July 13, 2007

6. Others
— POSCO invests 80% equity of POSCO MEXICO Human Tech S.A. de C.V.
— The above amount is applied with the exchange rate (W/$:918.00) on July 13, 2007.