X0303 4 2010-02-23 0001056239 L 3 COMMUNICATIONS HOLDINGS INC LLL 0001431205 Kantor Steven C/O L-3 COMMUNICATIONS CORPORATION 600 THIRD AVENUE NEW YORK NY 10016 0 1 0 0 SEE REMARK Common Stock 2010-02-23 4 A 0 2828 0 A 9660 D Common Stock 2010-02-23 4 A 0 1356 0 A 11016 D Common Stock 2010-02-23 4 F 0 492 0 D 10542 D 02/23/10 Employee Stock Option (Right to Buy) 90.18 2010-02-23 4 A 0 18398 0 D 2020-02-23 Common Stock 18398 18398 D Grant of shares of restricted stock units which vest on the three year anniversary of the grant date. Reflects additional shares acquired through the Company's Employee Stock Purchase Plan and Master Savings (401(k)) Plan and grants of Restricted Stock Units. Represents the vesting of performance units settled in common stock. Represents the number of common shares surrendered to pay applicable tax withholding on the performance units. This option vests annually in equal one-third increments beginning on the one-year anniversary of the grant date. Senior Vice President and President of Marine and Power Systems Group /s/ Allen E. Danzig as Attorney-in-Fact 2010-02-25