nq2.htm



 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY
 
Investment Company Act file number 811-22425
 
Nuveen Build America Bond Opportunity Fund
(Exact name of registrant as specified in charter)
 
Nuveen Investments
        333 West Wacker Drive, Chicago, Illinois 60606         
(Address of principal executive offices) (Zip code)
 

Kevin J. McCarthy
Vice President and Secretary
        333 West Wacker Drive, Chicago, Illinois 60606         
(Name and address of agent for service)
 
Registrant's telephone number, including area code:         312-917-7700        
 
Date of fiscal year end:            3/31          
 
Date of reporting period:         12/31/15         
 
Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.
 
A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

 
 
 

 
 
Item 1. Schedule of Investments
 
           
   
Portfolio of Investments
     
           
   
Nuveen Build America Bond Opportunity Fund (NBD)
     
   
December 31, 2015 (Unaudited)
     
 
 
Principal
   
Optional Call
   
Amount (000)
 
Description (1)
Provisions (2)
Ratings (3)
Value
   
LONG-TERM INVESTMENTS – 106.9% (99.3% of Total Investments)
     
           
   
MUNICIPAL BONDS – 106.1% (98.5% of Total Investments)
     
           
   
Alabama – 0.7% (0.6% of Total Investments)
     
$       1,000
 
Baptist Health Care Authority, Alabama, An Affiliate of UAB Health System, Taxable Bond Series
No Opt. Call
A3
$   1,011,370
   
2013A, 5.500%, 11/15/43
     
   
California – 24.6% (22.9% of Total Investments)
     
1,500
 
California State Public Works Board, Lease Revenue Bonds, Various Capital Projects, Build
No Opt. Call
A+
2,123,595
   
America Taxable Bond Series 2009G-2, 8.361%, 10/01/34
     
2,000
 
Los Angeles Community College District, Los Angeles County, California, General Obligation
No Opt. Call
AA+
6,165,500
   
Bonds, Tender Option Bond Trust TN027, 28.897%, 8/01/49, 144A (IF) (4)
     
3,185
 
Los Angeles County Public Works Financing Authority, California, Lease Revenue Bonds, Multiple
No Opt. Call
AA
4,459,127
   
Capital Projects I, Build America Taxable Bond Series 2010B, 7.618%, 8/01/40
     
2,650
 
Los Angeles Department of Airports, California, Revenue Bonds, Los Angeles International
No Opt. Call
AA–
3,403,236
   
Airport, Build America Taxable Bonds, Series 2009C, 6.582%, 5/15/39
     
2,000
 
Los Angeles Department of Water and Power, California, Water System Revenue Bonds, Tender
No Opt. Call
AA
5,674,500
   
Option Bond Trust T0003, 28.982%, 7/01/42, 144A (IF) (4)
     
1,000
 
Oakland Redevelopment Agency, California, Subordinated Housing Set Aside Revenue Bonds,
No Opt. Call
A+
1,080,130
   
Federally Taxable Series 2011A-T, 7.500%, 9/01/19
     
2,200
 
San Diego County Regional Transportation Commission, California, Sales Tax Revenue Bonds,
No Opt. Call
AAA
2,777,852
   
Build America Taxable Bonds Series 2010A, 5.911%, 4/01/48
     
3,000
 
San Francisco City and County Public Utilities Commission, California, Water Revenue Bonds,
No Opt. Call
AA–
4,207,710
   
Build America Taxable Bonds, Series 2010G, 6.950%, 11/01/50
     
675
 
San Francisco City and County Redevelopment Financing Authority, California, Tax Allocation
No Opt. Call
AA–
853,511
   
Revenue Bonds, San Francisco Redevelopment Projects, Taxable Series 2009E, 8.406%, 8/01/39
     
2,000
 
San Francisco City and County, California, Certificates of Participation, 525 Golden Gate
No Opt. Call
AA
3,801,200
   
Avenue, San Francisco Public Utilities Commission Office Project, Tender Option Bond Trust
     
   
B001, 28.637%, 11/01/41, 144A (IF)
     
315
 
Stanton Redevelopment Agency, California, Consolidated Project Tax Allocation Bonds, Series
No Opt. Call
A–
351,307
   
2011A, 7.000%, 12/01/19
     
3,000
 
The Regents of the University of California, Medical Center Pooled Revenue Bonds, Build
No Opt. Call
AA–
3,870,600
   
America Taxable Bonds, Series 2010H, 6.548%, 5/15/48
     
23,525
 
Total California
   
38,768,268
   
Colorado – 5.3% (4.9% of Total Investments)
     
4,000
 
Colorado State Bridge Enterprise Revenue Bonds, Federally Taxable Build America Series 2010A,
No Opt. Call
AA
4,993,920
   
6.078%, 12/01/40
     
2,555
 
Regional Transportation District, Colorado, Sales Tax Revenue Bonds, Fastracks Project, Build
No Opt. Call
AA+
3,282,434
   
America Series 2010B, 5.844%, 11/01/50
     
6,555
 
Total Colorado
   
8,276,354
   
Connecticut – 1.0% (0.9% of Total Investments)
     
1,355
 
Harbor Point Infrastructure Improvement District, Connecticut, Special Obligation Revenue
4/20 at 100.00
N/R
1,590,702
   
Bonds, Harbor Point Project, Federally Taxable – Issuer Subsidy – Recovery Zone Economic
     
   
Development Bond Series 2010B, 12.500%, 4/01/39
     
   
Georgia – 2.7% (2.5% of Total Investments)
     
1,000
 
Cobb-Marietta Coliseum and Exhibit Hall Authority, Georgia, Revenue Bonds, Cobb County
1/26 at 100.00
AAA
1,012,460
   
Coliseum Project, Taxable Series 2015, 4.500%, 1/01/47
     
3,000
 
Georgia Municipal Electric Authority, Plant Vogtle Units 3 & 4 Project P Bonds, Refunding
No Opt. Call
A–
3,291,180
   
Taxable Build America Bonds Series 2010A, 7.055%, 4/01/57
     
4,000
 
Total Georgia
   
4,303,640
   
Illinois – 9.1% (8.5% of Total Investments)
     
3,715
 
Chicago Transit Authority, Illinois, Sales Tax Receipts Revenue Bonds, Federally Taxable Build
No Opt. Call
AA
4,018,961
   
America Bonds, Series 2010B, 6.200%, 12/01/40
     
1,255
 
Chicago, Illinois, General Airport Revenue Bonds, O’Hare International Airport, Third Lien,
1/20 at 100.00
A
1,407,257
   
Build America Taxable Bond Series 2010B, 6.845%, 1/01/38
     
2,000
 
Illinois State, General Obligation Bonds, Build America Taxable Bonds, Series 2010-5,
No Opt. Call
A–
2,176,580
   
7.350%, 7/01/35
     
5,000
 
Illinois Toll Highway Authority, Toll Highway Revenue Bonds, Build America Taxable Bonds,
No Opt. Call
AA–
6,236,650
   
Senior Lien Series 2009A, 6.184%, 1/01/34
     
240
 
Northern Illinois Municipal Power Agency, Power Project Revenue Bonds, Prairie State Project,
No Opt. Call
A2
277,154
   
Build America Bond Series 2009C, 6.859%, 1/01/39
     
205
 
Northern Illinois Municipal Power Agency, Power Project Revenue Bonds, Prairie State Project,
No Opt. Call
A2
263,372
   
Build America Taxable Bond Series 2010A, 7.820%, 1/01/40
     
12,415
 
Total Illinois
   
14,379,974
   
Indiana – 0.8% (0.7% of Total Investments)
     
1,000
 
Indianapolis Local Public Improvement Bond Bank, Indiana, Build America Taxable Bonds, Series
No Opt. Call
Aa1
1,245,440
   
2010B-2, 6.116%, 1/15/40
     
   
Kentucky – 2.4% (2.2% of Total Investments)
     
3,000
 
Louisville and Jefferson County Metropolitan Sewer District, Kentucky, Sewer and Drainage
No Opt. Call
AA
3,805,830
   
System Revenue Bonds, Build America Taxable Bonds Series 2010A, 6.250%, 5/15/43
     
   
Massachusetts – 2.8% (2.6% of Total Investments)
     
2,000
 
Massachusetts, Transportation Fund Revenue Bonds, Accelerated Bridge Program, Tender Option
No Opt. Call
AAA
4,462,500
   
Bond Trust T0004, 24.810%, 6/01/40, 144A (IF) (4)
     
   
Michigan – 1.1% (1.0% of Total Investments)
     
2,030
 
Michigan Tobacco Settlement Finance Authority, Tobacco Settlement Asset-Backed Revenue Bonds,
No Opt. Call
B–
1,747,546
   
Taxable Turbo Series 2006A, 7.309%, 6/01/34
     
   
Mississippi – 1.5% (1.4% of Total Investments)
     
2,085
 
Mississippi State, General Obligation Bonds, Build America Taxable Bond Series 2010F,
No Opt. Call
AA+
2,375,149
   
5.245%, 11/01/34
     
   
Nevada – 2.7% (2.5% of Total Investments)
     
1,950
 
Clark County, Nevada, Airport Revenue Bonds, Senior Lien Series 2009B, 6.881%, 7/01/42
7/19 at 100.00
AA–
2,184,526
1,500
 
Clark County, Nevada, Airport Revenue Bonds, Taxable Direct Payment Build America Bond Series
No Opt. Call
AA–
2,071,200
   
2010C, 6.820%, 7/01/45
     
3,450
 
Total Nevada
   
4,255,726
   
New Jersey – 5.0% (4.7% of Total Investments)
     
4,000
 
New Jersey Turnpike Authority, Revenue Bonds, Build America Taxable Bonds, Series 2010A,
No Opt. Call
A+
5,523,320
   
7.102%, 1/01/41
     
2,000
 
Rutgers State University, New Jersey, Revenue Bonds, Build America Taxable Bond Series 2010H,
No Opt. Call
Aa3
2,383,480
   
5.665%, 5/01/40
     
6,000
 
Total New Jersey
   
7,906,800
   
New York – 13.7% (12.7% of Total Investments)
     
2,000
 
Dormitory Authority of the State of New York, State Personal Income Tax Revenue Bonds, Tender
No Opt. Call
AAA
4,125,700
   
Option Bond Trust B004, 24.365%, 3/15/40, 144A (IF)
     
3,270
 
Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Federally
11/33 at 100.00
AA–
4,297,728
   
Taxable Issuer Subsidy Build America Bonds, Series 2010A, 6.668%, 11/15/39
     
1,500
 
New York City Municipal Water Finance Authority, New York, Water and Sewer System Revenue
No Opt. Call
AA+
1,831,485
   
Bonds, Second Generation Resolution, Build America Taxable Bonds, Fiscal 2011 Series AA,
     
   
5.440%, 6/15/43 (4)
     
2,000
 
New York City Municipal Water Finance Authority, New York, Water and Sewer System Revenue
No Opt. Call
AA+
4,950,900
   
Bonds, Second Generation Resolution, Taxable Tender Option Bonds Trust T30001-2, 25.808%,
     
   
6/15/44, 144A (IF)
     
3,500
 
New York City Transitional Finance Authority, New York, Building Aid Revenue Bonds, Build
No Opt. Call
AA
4,629,660
   
America Taxable Bond Fiscal 2011 Series 2010S-1B, 6.828%, 7/15/40
     
1,500
 
New York City, New York, General Obligation Bonds, Federally Taxable Build America Bonds,
12/20 at 100.00
AA
1,746,720
   
Series 2010-F1, 6.646%, 12/01/31
     
13,770
 
Total New York
   
21,582,193
   
North Carolina – 1.4% (1.3% of Total Investments)
     
1,955
 
North Carolina Turnpike Authority, Triangle Expressway System State Annual Appropriation
1/19 at 100.00
AA
2,166,981
   
Revenue Bonds, Federally Taxable Issuer Subsidy Build America Bonds, Series 2009B,
     
   
6.700%, 1/01/39
     
   
Ohio – 4.5% (4.1% of Total Investments)
     
3,000
 
American Municipal Power Inc., Ohio, Meldahl Hydroelectric Projects Revenue Bonds, Build
No Opt. Call
A
4,018,050
   
America Bond Series 2010B, 7.499%, 2/15/50
     
2,650
 
Northeast Ohio Regional Sewer District, Wastewater Improvement Revenue Bonds, Build America
11/20 at 100.00
AA+
2,994,659
   
Taxable Bonds, Series 2010, 6.038%, 11/15/40
     
5,650
 
Total Ohio
   
7,012,709
   
Pennsylvania – 1.9% (1.8% of Total Investments)
     
2,575
 
Pennsylvania Turnpike Commission, Turnpike Revenue Bonds, Build America Taxable Bonds, Series
No Opt. Call
A1
3,006,029
   
2010B, 5.511%, 12/01/45
     
   
South Carolina – 7.5% (6.9% of Total Investments)
     
8,985
 
South Carolina Public Service Authority, Electric System Revenue Bonds, Santee Cooper,
No Opt. Call
AA–
11,279,859
   
Federally Taxable Build America, Series 2010C, 6.454%, 1/01/50 (UB)
     
205
 
South Carolina Public Service Authority, Electric System Revenue Bonds, Santee Cooper,
No Opt. Call
AA–
466,795
   
Federally Taxable Build America, Tender Option Bond Trust T30002, 27.611%, 1/01/50, 144A (IF)
     
9,190
 
Total South Carolina
   
11,746,654
   
Tennessee – 3.3% (3.1% of Total Investments)
     
4,060
 
Metropolitan Government Nashville & Davidson County Convention Center Authority, Tennessee,
No Opt. Call
Aa3
5,170,897
   
Tourism Tax Revenue Bonds, Build America Taxable Bonds, Subordinate Lien Series 2010B,
     
   
6.731%, 7/01/43
     
   
Texas – 7.5% (7.0% of Total Investments)
     
2,520
 
Dallas Area Rapid Transit, Texas, Sales Tax Revenue Bonds, Build America Taxable Bonds, Series
No Opt. Call
AA+
3,310,499
   
2009B, 5.999%, 12/01/44
     
2,000
 
Dallas Convention Center Hotel Development Corporation, Texas, Hotel Revenue Bonds, Build
No Opt. Call
A1
2,577,020
   
America Taxable Bonds, Series 09B, 7.088%, 1/01/42
     
2,350
 
North Texas Tollway Authority, System Revenue Bonds, Taxable Build America Bond Series 2009B,
No Opt. Call
A1
3,228,900
   
6.718%, 1/01/49
     
1,000
 
North Texas Tollway Authority, System Revenue Bonds, Taxable Build America Bonds, Series
2/20 at 100.00
Baa2
1,185,870
   
2010-B2, 8.910%, 2/01/30
     
1,500
 
Texas Public Finance Authority, Revenue Bonds, Texas Windstorm Insurance Association (TWIA),
7/19 at 100.00
N/R
1,496,205
   
Series 2014, 8.250%, 7/01/24
     
9,370
 
Total Texas
   
11,798,494
   
Virginia – 4.4% (4.1% of Total Investments)
     
3,110
 
Metropolitan Washington Airports Authority, Virginia, Dulles Toll Road Second Senior Lien
No Opt. Call
BBB+
4,192,995
   
Revenue Bonds, Build America Bonds, Series 2009D, 7.462%, 10/01/46 – AGC Insured
     
3,560
 
Tobacco Settlement Financing Corporation of Virginia, Tobacco Settlement Asset Backed Bonds,
6/16 at 100.00
B–
2,729,310
   
Refunding Senior Lien Series 2007A, 6.706%, 6/01/46
     
6,670
 
Total Virginia
   
6,922,305
   
Washington – 2.2% (2.1% of Total Investments)
     
2,855
 
Washington State Convention Center Public Facilities District, Lodging Tax Revenue Bonds,
No Opt. Call
Aa3
3,500,087
   
Build America Taxable Bond Series 2010B, 6.790%, 7/01/40
     
$   124,510
 
Total Municipal Bonds (cost $130,828,221)
   
167,035,648
             
Principal
           
Amount (000)
 
Description (1)
Coupon
Maturity
Ratings (3)
Value
   
CORPORATE BONDS – 0.8% (0.8% of Total Investments)
       
             
   
Diversified Consumer Services – 0.8% (0.8% of Total Investments)
       
$      1,300
 
BCOM Investment Partners LLC, Taxable Notes, Burrell College of Osteopathic Medicine,
7.500%
9/01/45
N/R
$    1,312,055
   
Series 2015, 144A
       
$      1,300
 
Total Corporate Bonds (cost $1,300,000)
     
1,312,055
   
Total Long-Term Investments (cost $132,128,221)
     
168,347,703
 
Principal
         
Amount (000)
 
Description (1)
Coupon
Maturity
Value
   
SHORT-TERM INVESTMENTS – 0.7% (0.7% of Total Investments)
     
           
   
REPURCHASE AGREEMENTS – 0.7% (0.7% of Total Investments)
     
$     1,108
 
Repurchase Agreement with State Street Bank, dated 12/31/15, repurchase price $1,107,894,
0.010%
1/04/16
$    1,107,893
   
   collateralized by $1,050,000 U.S. Treasury Notes, 3.500%, due 5/15/20, value $1,132,688
     
   
Total Short-Term Investments (cost $1,107,893)
   
1,107,893
   
Total Investments (cost $133,236,114) – 107.6%
   
169,455,596
   
Borrowings – (7.5)% (5), (6)
   
(11,800,000)
   
Floating Rate Obligations – (4.6)%
   
(7,190,000)
   
Other Assets Less Liabilities – 4.5% (7)
   
7,041,830
   
Net Assets Applicable to Common Shares – 100%
   
$ 157,507,426
 
 
 

 

Investments in Derivatives as of December 31, 2015 
           
 
Interest Rate Swaps outstanding:
             
                 
Variation
 
   
Fund
   
Fixed Rate
     
Margin
Unrealized
 
Notional
Pay/Receive
Floating Rate
Fixed Rate
Payment
Effective
Termination
 
Receivable/
Appreciation
Counterparty
Amount
Floating Rate
Index
(Annualized)
Frequency
Date (8)
Date
Value
Payable
(Depreciation)
Barclays Bank
   PLC
$29,500,000
Receive
1-Month USD LIBOR-ICE
1.655%
Monthly
6/01/16
6/01/20
$ (448,607)
N/A
$ (625,059)
Barclays Bank
   PLC*
8,100,000
Receive
3-Month USD LIBOR-ICE
3.219%
Semi-Annually
1/15/16
1/15/44
(1,024,223)
$ (68,525)
(1,024,744)
Barclays Bank
   PLC*
22,000,000
Receive
3-Month USD LIBOR-ICE
2.971%
Semi-Annually
7/13/16
7/13/45
(1,419,536)
(187,012)
(1,419,536)
Morgan Stanley
   & Co. LLC*
32,300,000
Receive
3-Month USD LIBOR-ICE
2.558%
Semi-Annually
3/17/16
3/17/28
(756,577)
(143,470)
(756,577)
 
$91,900,000
           
$(3,648,943)
$(399,007)
$(3,825,916)
* Citigroup Global Market Inc. is the clearing broker for this transaction.
 
Fair Value Measurements
 
Fair value is defined as the price that would be received upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market for the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The following is a summary of the three-tiered hierarchy of valuation input levels.
 
Level 1 – Inputs are unadjusted and prices are determined using quoted prices in active markets for identical securities.
 
Level 2 – Prices are determined using other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).
 
Level 3 – Prices are determined using significant unobservable inputs (including management’s assumptions in determining the fair value of investments).
 
The inputs or methodologies used for valuing securities are not an indication of the risks associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of the end of the reporting period:
 
 
Level 1
Level 2
Level 3
Total
Long-Term Investments:
       
Municipal Bonds
$ —
$167,035,648
$ —
$167,035,648
Corporate Bonds
1,312,055
1,312,055
Short-Term Investments
       
Repurchase Agreements
1,107,893
1,107,893
Investments in Derivatives:
       
Interest Rate Swaps*
(3,825,916)
(3,825,916)
Total
$ —
$165,629,680
$ —
$165,629,680
* Represents net unrealized appreciation (depreciation).
 
Income Tax Information
 
The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due to timing differences in recognizing certain gains and losses on investment transactions and the treatment of investments in inverse floating rate securities reflected as financing transactions, if any. To the extent that differences arise that are permanent in nature, such amounts are reclassified within the capital accounts on the Statement of Assets and Liabilities presented in the annual report, based on their federal tax basis treatment; temporary differences do not require reclassification. Temporary and permanent differences do not impact the net asset value of the Fund.
 
As of December 31, 2015, the cost of investments (excluding investments in derivatives) was $126,043,246.
 
Gross unrealized appreciation and gross unrealized depreciation of investments (excluding investments in derivatives) as of December 31, 2015, were as follows:
   
Gross unrealized:
 
   Appreciation
$ 36,401,488
   Depreciation
(181,692)
Net unrealized appreciation (depreciation) of investments
$ 36,219,796
 
     
(1)
 
All percentages shown in the Portfolio of Investments are based on net assets applicable to common
   
shares unless otherwise noted.
(2)
 
Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption.
   
There may be other call provisions at varying prices at later dates. Certain mortgage-backed securities
   
may be subject to periodic principal paydowns.
(3)
 
Ratings: Using the highest of Standard & Poor’s Group ("Standard & Poor's"), Moody’s Investors Service,
   
Inc. ("Moody's") or Fitch, Inc. ("Fitch") rating. Ratings below BBB by Standard & Poor’s, Baa by Moody’s
   
or BBB by Fitch are considered to be below investment grade. Holdings designated N/R are not rated
   
by any of these national rating agencies.
(4)
 
Investment, or portion of investment, has been pledged to collateralize the net payment obligations for
   
investments in derivatives and/or inverse floating rate transactions.
(5)
 
Borrowings as a percentage of Total Investments is 7.0%.
(6)
 
The Fund may pledge up to 100% of its eligible investments (excluding any investments separately
   
pledged as collateral for specific investments in derivatives, when applicable) as collateral for borrowings.
(7)
 
Other assets less liabilities includes the unrealized appreciation (depreciation) of certain over-the-counter
   
derivatives as well as the exchange-cleared and exchange-traded derivatives, when applicable.
(8)
 
Effective date represents the date on which both the Fund and counterparty commence interest
   
payment accruals on each contract.
(IF)
 
Inverse floating rate investment.
(UB)
 
Underlying bond of an inverse floating rate trust reflected as a financing transaction.
144A
 
Investment is exempt from registration under Rule 144A of the Securities Act of 1933, as amended.
   
These investments may only be resold in transactions exempt from registration, which are normally
   
those transactions with qualified institutional buyers.
N/A
 
Not Applicable
USD LIBOR-ICE
 
United States Dollar-London Inter-Bank Offered Rate Intercontinental Exchange
 
 
 

 
 
Item 2. Controls and Procedures.

a.  
The registrant's principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act") (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).
 
b.  
There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting.
 
Item 3. Exhibits.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: See EX-99 CERT attached hereto.

 
 
 

 
 
SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 
(Registrant)  Nuveen Build America Bond Opportunity Fund 
 
By (Signature and Title) /s/ Kevin J. McCarthy                    
       Kevin J. McCarthy
     Vice President and Secretary
                                         
Date:         February 29, 2016        
 
Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
 
By (Signature and Title) /s/ Gifford R. Zimmerman            
       Gifford R. Zimmerman
     Chief Administrative Officer (principal executive officer)
                        
Date:         February 29, 2016        
 
By (Signature and Title) /s/ Stephen D. Foy                         
 
     Stephen D. Foy
     Vice President and Controller (principal financial officer)
                                                                                         
Date:         February 29, 2016