Sec Form 4 Filing - Siffermann William A @ Nuveen Build America Bond Fund - 2018-11-19

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Siffermann William A 2. Issuer Name and Ticker or Trading Symbol Nuveen Build America Bond Fund [ NBB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Vice President (Last) (First) (Middle) C/O NUVEEN INVESTMENTS, 333 W. WACKER DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 11/19/2018 (Street) CHICAGO, IL60606 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 11/19/2018 J 324.482 A $ 0 ( 1 ) 324.482 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Siffermann William A C/O NUVEEN INVESTMENTS 333 W. WACKER DRIVE CHICAGO, IL60606 Vice President Signatures Mark L. Winget/ Signed Under POA 11/19/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Acquired pursuant to the Agreement and Plan of Reorganization dated as of November 19, 2018 by and between Nuveen Taxable Income Fund (formerly Nuveen Build America Bond Fund) (NBB) and Nuveen Build America Bond Opportunity Fund (NBD) in exchange for 302.342 common shares of NBB and cash in lieu of fractional shares of NBD. The exchange ratio was calculated as the ratio of the NBB net asset value per common share over the NBD net asset value per common share, each calculated as of the close of business on November 16, the business day immediately preceding the closing of the reorganization. As of such time, the net asset value per common share of NBB was $20.7201 and the net asset value per common share of NBD was $22.2374. On November 16, 2018, the closing trading price of NBB common shares was $18.94 and the closing trading price of NBD common shares was $20.35.

Remarks: siffermannpoa.txt

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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