X0306 4 2017-12-27 0001125259 CARNIVAL PLC CUK 0001553147 Thamm Michael Olaf C/O CARNIVAL CORPORATION 3655 N.W. 87TH AVENUE MIAMI FL 33178 1 CEO - Costa Crociere Ordinary Shares 2017-12-27 4 S 0 28000 66.59 D 67630.531 D Represents a sale of shares to satisfy the tax obligation on the release of vested Performance Restricted Stock Units previously reported on December 29, 2016. The transaction was conducted in British Pounds. The sale price of GBP48.63 was converted into US$ at the December 27, 2017 conversion rate of GBP1 = USD1.3369. This transaction was executed in multiple trades at prices ranging from $66.04 to $66.765. The price reported above reflects the average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Includes shares acquired pursuant to the dividend reinvestment feature of the reporting person's brokerage account. /s/ Michael O. Thamm 2017-12-29