SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15D-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of January, 2012

Commission File Number: 1-13368

POSCO (KSE: 005490.KS - news)

(Translation of registrant's name into English)

POSCO Center, 892 Daechi 4-dong, Kangnam-gu, Seoul, Korea, 135-777

(Address of principal executive office)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or

Form 40-F.)

Form20-F [ x ] Form 40-F [ ____ ]

[Indicate by check mark whether the registrant by furnishing the information contained in this Form is also

thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.

Yes [ ____ ] No [ x ]

[If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b) :
82- .]

POSCO is furnishing under cover of Form 6-K:

Exhibit 99.1: An English-language translation of documents with respect to Change in Ownership of the Largest
Shareholder

Change in Ownership of the Largest Shareholder

We hereby inform you of the change in the number of common shares owned by the largest shareholder of POSCO (the "Company").

As of December 31, 2011, National Pension Service has increased the number of Company's shares from 4,808,309 (5.51% of Company's outstanding shares) to 5,937,323 (6.81% of Company's outstanding shares). The change is based on closing of the Company's registry of shareholders as of December 31, 2011.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

POSCO

(Registrant)

Date: January 31, 2012 By /s/ Choi, Jong-Tae

(Signature)*

*Print the name and title under the signature of the signing officer. Name: Choi, Jong-Tae

Title: President