X0304 4 2012-03-01 0 0001051003 BLACKROCK DEBT STRATEGIES FUND, INC. DSU 0001326138 Castellano Michael J 55 EAST 52ND STREET NEW YORK NY 10055 1 0 0 0 Common Stock 2012-03-01 4 P 0 2500 4.099 A 2500 D Thse shares were purchased in multiple transactions. The range of prices for the transactions reported in this line was 4.0950 to 4.1000. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer, or the security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price. /s/ Noah Gellner as Attorney-in-Fact 2012-03-02