X0306 4 2013-01-31 0001364742 BlackRock Inc. BLK 0001438849 Petach Ann Marie BLACKROCK, INC. 55 EAST 52ND STREET NEW YORK NY 10055 1 CFO and Senior MD Shares Of Common Stock (par Value $0.01 Per Share) 2013-01-31 4 F 0 1110 237.40 D 52046 D Represents the withholding by BlackRock of Common Stock to satisfy tax obligation on the vesting of the reporting person's Restricted Stock Units granted under the Amended and Restated BlackRock, Inc. 1999 Stock Award and Incentive Plan. Includes (i) 1,331 shares of Restricted Stock vesting on 1/31/14, (ii) 6,549 shares of Restricted Stock vesting on 1/31/14, (iii) 1,905 Restricted Stock Units vesting in installments on 1/31/14 and 1/31/15, (iv) 2,256 Restricted Stock Units vesting in installments on 1/31/14, 1/31/15 and 1/31/16, (v) 11,577 Restricted Stock Units awarded on 1/20/12 that will vest in whole or in part only on the satisfaction of one or more previously-disclosed Common Stock price targets, but which may not vest before 1/31/16 and will expire on 1/31/18 to the extent not then vested and (vi) 10,452 Restricted Stock Units awarded on 1/18/13 that will vest in whole or in part only on the satisfaction of one or more previously disclosed Common Stock price targets, but which may not vest before 1/31/17 and will expire on 1/31/19 to the extent not then vested. 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 Ann Marie Petach 2013-02-01