X0303 4 2009-05-05 0 0001370946 Owens Corning OC 0001263972 D. E. SHAW LAMINAR PORTFOLIOS, L.L.C. 120 WEST FORTY-FIFTH STREET 39TH FLOOR NEW YORK NY 10036 1 0 1 1 See footnotes 3 and 4. 0001327537 D. E. Shaw Oculus Portfolios, L.L.C. 120 WEST FORTY-FIFTH STREET 39TH FLOOR NEW YORK NY 10036 1 0 1 1 See footnotes 3 and 4. 0001009268 D. E. SHAW & CO, L.P. 120 WEST FORTY-FIFTH STREET 39TH FLOOR NEW YORK NY 10036 1 0 1 1 See footnotes 3 and 4. 0001277502 D. E. SHAW & CO, L.L.C. 120 WEST FORTY-FIFTH STREET 39TH FLOOR NEW YORK NY 10036 1 0 1 1 See footnotes 3 and 4. 0001023870 SHAW DAVID E 120 WEST FORTY-FIFTH STREET 39TH FLOOR NEW YORK NY 10036 1 0 1 1 See footnotes 3 and 4. Common Stock 2009-05-05 4 A 0 1255 A 13095142 D Issued by Issuer in a transaction exempt under Rule 16b-3 to D. E. Shaw & Co., L.P. ("DESCO LP"), David Lyon's employer, as compensation for David Lyon's service as a director of the Issuer (see footnote 4). No consideration was paid for the security. Deferred share portion of quarterly Director retainer/fees. DESCO LP, as investment adviser to D. E. Shaw Laminar Portfolios, L.L.C. ("Laminar") and D. E. Shaw Oculus Portfolios, L.L.C. ("Oculus"); D. E. Shaw & Co., L.L.C. ("DESCO LLC"), as managing member of Laminar and Oculus; and David E. Shaw (as president and sole shareholder of D. E. Shaw & Co., Inc., which is the general partner of DESCO LP, and as president and sole shareholder of D. E. Shaw & Co. II, Inc., which is the managing member of DESCO LLC) may be deemed to be the beneficial owners of more than 10% of the Common Stock of the Issuer for purposes of Rule 16a-1(a) of the Securities Exchange Act of 1934. (Continued from Footnote 3) In accordance with instruction 4(b)(iv), the entire number of shares of Common Stock of the Issuer that may be deemed to be beneficially owned by Laminar, Oculus, DESCO LP, or DESCO LLC was previously reported. Each of DESCO LP, DESCO LLC, and David E. Shaw disclaims any beneficial ownership of any of the securities reported, except to the extent of any pecuniary interest therein. The reporting persons also may be deemed, for Section 16 purposes, directors of the Issuer by virtue of DESCO LP employee David Lyon's service as member of the Issuer's board of directors. None of Laminar, Oculus, DESCO LP, DESCO LLC, or David E. Shaw serves as a director of the Issuer. D. E. Shaw Laminar Portfolios, L.L.C. By: Rochelle Elias, Authorized Signatory 2009-05-07 D. E. Shaw Oculus Portfolios, L.L.C. By: Rochelle Elias, Authorized Signatory 2009-05-07 D. E. Shaw & Co., L.P. By: Rochelle Elias, Chief Compliance Officer 2009-05-07 D. E. Shaw & Co., L.L.C. By: Rochelle Elias, Chief Compliance Officer 2009-05-07 David E. Shaw By: Rochelle Elias, Attorney-in-fact for David E. Shaw 2009-05-07