X0304 4/A 2011-06-30 2011-07-05 0000898293 JABIL CIRCUIT INC JBL 0001196744 MAIN TIMOTHY L 10560 DR. MARTIN LUTHER KING, JR. ST. N. ST. PETERSBURG FL 33716 1 President & CEO Common Stock 2011-06-30 4 S 0 198900.0000 20.0409 D 1901826.0000 D Common Stock 1009.0000 I By B. Main Trust Common Stock 1009.0000 I By M. Main Trust Common Stock 1009.0000 I By T. Main, II Trust This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The original Form 4 filed by the reporting person inadvertently omitted a footnote stating that the transactions reflected on this line were executed in multiple trades at prices ranging from $20.0000 to $20.1400. The price reported above reflects the weighted average sale price for the shares set forth on this line. The reporting person hereby undertakes to provide upon request by the SEC Staff, the Issuer or a security holder of the Issuer full information regarding the number of shares sold at each separate price. The reporting person disclaims beneficial ownership of the securities shown as being held by the Brian James Main Irrevocable Trust, which is for the benefit of one of the reporting person's children, and for which the reporting person is one of three trustees who share voting and dispositive power. This report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. The reporting person disclaims beneficial ownership of the securities shown as being held by the Melissa Marian Nelson Main Irrevocable Trust, which is for the benefit of one of the reporting person's children, and for which the reporting person is one of three trustees who share voting and dispositive power. This report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. The reporting person disclaims beneficial ownership of the securities shown as being held by the Timothy Lee Main, II Irrevocable Trust, which is for the benefit of one of the reporting person's children, and for which the reporting person is one of three trustees who share voting and dispositive power. This report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. /s/ Kathryn M. Vetter, Attorney-in-Fact 2011-10-21