X0303 4 2011-03-25 0 0001130258 ACME PACKET INC APKT 0001461366 Shields John F C/O ACME PACKET, INC. 100 CROSBY DRIVE BEDFORD MA 01730 0 1 0 0 VP Manufacturing Ops Common Stock 2011-03-25 4 M 0 5000 1.00 A 10000 D Common Stock 2011-03-25 4 S 0 5000 68.2327 D 5000 D Stock Option (Right to Buy) 1.00 2011-03-25 4 M 0 5000 0.00 D 2015-12-23 Common Stock 5000 35000 D Sales were made pursuant to 10b5-1 plans entered into by the reporting person. This price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $68.00 to $68.40. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. Twenty-five percent of the shares underlying the option vested on December 23, 2006, and the balance of the shares vest in equal monthly installments at the end of each calendar month beginning on January 31, 2007 and ending on December 31, 2009. /s/ Peter J. Minihane, as attorney-in-fact 2011-03-29