X0306 4 2016-04-15 0001364742 BlackRock Inc. BLK 0001497052 Smith Jeff A BLACKROCK, INC. 55 EAST 52ND STREET NEW YORK NY 10055 1 Senior Managing Director Shares Of Common Stock (par Value $0.01 Per Share) 2016-04-15 4 S 0 2560 354.132 D 25421 D Shares Of Common Stock (par Value $0.01 Per Share) 2016-04-15 4 S 0 90 357.54 D 25331 D This transaction was executed in multiple trades at prices ranging from $353.59 to $354.30. The price reported represents the weighted average sale price of these trades. 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 shares sold at each separate price. Includes Common Stock, Restricted Stock Units that will vest over a period of 1 to 3 years and Restricted Stock Units that will vest in whole or in part only on the satisfaction of one or more previously-disclosed Common Stock price targets. Each Restricted Stock Unit is payable solely by delivery of an equal number of shares of Common Stock. /s/ Daniel R. Waltcher as Attorney-in-Fact for Jeff A. Smith 2016-04-19