Edgar Filing: Nuveen Floating Rate Income Opportunity Fund

Nuveen Floating Rate Income Opportunity Fund

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 811-21579

Nuveen Floating Rate Income Opportunity Fund

(Exact name of registrant as specified in charter)

333 West Wacker Drive, Chicago, Illinois 60606

(Address of principal executive offices) (Zip code)

Gifford R. Zimmerman—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: July 31

Date of reporting period: April 30, 2018

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

JRO

Nuveen Floating Rate Income
Opportunity Fund

Portfolio of Investments April 30, 2018

(Unaudited)


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		LONG-TERM INVESTMENTS – 153.4% (96.4% of Total Investments)

		VARIABLE RATE SENIOR LOAN INTERESTS – 129.8% (81.5% of Total Investments) (2)

		Aerospace & Defense – 2.7% (1.7% of Total Investments)

$	1,985	Sequa Corporation, Term Loan, Second Lien		11.312%		1-Month LIBOR		9.000%		4/28/22		CCC	$	2,016,069
	5,723	Sequa Corporation, Term Loan B		7.071%		3-Month LIBOR		5.000%		11/28/21		B–		5,806,685
	3,316	Transdigm, Inc., Term Loan E		4.651%		1-Month LIBOR		2.750%		5/14/22		Ba2		3,334,181
	737	Transdigm, Inc., Term Loan F		4.789%		3-Month LIBOR		2.750%		6/09/23		Ba2		740,942
	400	Transdigm, Inc., Term Loan G, First Lien		4.712%		3-Month LIBOR		2.500%		8/22/24		Ba2		402,318
	12,161	Total Aerospace & Defense												12,300,195

		Air Freight & Logistics – 0.6% (0.3% of Total Investments)

	1,118	PAE Holding Corporation, Term Loan B		7.494%		2-Month LIBOR		5.500%		10/20/22		B+		1,125,212
	1,444	XPO Logistics, Inc., Term Loan B		3.920%		3-Month LIBOR		2.000%		2/24/25		BB+		1,453,986
	2,562	Total Air Freight & Logistics												2,579,198

		Airlines – 1.9% (1.2% of Total Investments)

	2,394	American Airlines, Inc., Replacement Term Loan		3.900%		1-Month LIBOR		2.000%		6/27/20		BB+		2,400,274
	2,732	American Airlines, Inc., Replacement Term Loan		3.897%		1-Month LIBOR		2.000%		10/10/21		BB+		2,739,513
	3,623	American Airlines, Inc., Term Loan B		3.897%		1-Month LIBOR		2.000%		12/14/23		BB+		3,631,480
	8,749	Total Airlines												8,771,267

		Auto Components – 0.4% (0.3% of Total Investments)

	544	Horizon Global Corporation, Replacement Term Loan		6.401%		1-Month LIBOR		4.500%		6/30/21		B+		551,131
	1,488	Superior Industries International, Inc., Term Loan B		6.401%		1-Month LIBOR		4.500%		5/22/24		B1		1,502,849
	2,032	Total Auto Components												2,053,980

		Automobiles – 1.2% (0.8% of Total Investments)

	4,588	Chrysler Group LLC, Term Loan		3.900%		1-Month LIBOR		2.000%		12/31/18		Baa2		4,607,681
	997	DexKo Global, Inc., Term Loan B		5.802%		3-Month LIBOR		3.500%		7/24/24		B1		1,009,191
	137	DexKo Global, Inc., Term Loan B, (5)		4.363%		N/A		N/A		7/24/24		B1		139,176
	5,722	Total Automobiles												5,756,048

		Biotechnology – 0.9% (0.5% of Total Investments)

	3,960	Grifols, Inc., Term Loan B		3.994%		1-Week LIBOR		2.250%		1/31/25		BB		3,985,166

		Building Products – 1.6% (1.0% of Total Investments)

	1,000	Ply Gem Industries, Inc., Term Loan B		6.089%		3-Month LIBOR		3.750%		3/28/25		B		1,010,940
	6,322	Quikrete Holdings, Inc., Term Loan B		4.651%		1-Month LIBOR		2.750%		11/15/23		BB–		6,356,298
	7,322	Total Building Products												7,367,238

		Capital Markets – 0.3% (0.2% of Total Investments)

	1,464	RPI Finance Trust, Term Loan B6		4.302%		3-Month LIBOR		2.000%		3/27/23		BBB–		1,472,361

		Chemicals – 0.7% (0.4% of Total Investments)

	895	Ineos US Finance LLC, Term Loan		3.901%		1-Month LIBOR		2.000%		4/01/24		BB+		898,760
	1,521	Mineral Technologies, Inc., Term Loan B2		4.750%		N/A		N/A		5/07/21		BB+		1,542,292
	646	Univar, Inc., Term Loan B		4.401%		1-Month LIBOR		2.500%		7/01/24		BB		652,851
	3,062	Total Chemicals												3,093,903

		Commercial Services & Supplies – 4.4% (2.8% of Total Investments)

	730	ADS Waste Holdings, Inc., Term Loan B		3.998%		1-Week LIBOR		2.250%		11/10/23		BB+		735,629
	987	Fort Dearborn Holding Company, Inc., Term Loan, First Lien		6.309%		3-Month LIBOR		4.000%		10/19/23		B2		976,391


JRO		Nuveen Floating Rate Income Opportunity Fund (continued)
JRO		Portfolio of Investments April 30, 2018
		(Unaudited)


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Commercial Services & Supplies (continued)

$	1,000	Fort Dearborn Holding Company, Inc., Term Loan, Second Lien		10.812%		3-Month LIBOR		8.500%		10/07/24		CCC	$	950,000
	3,124	iQor US, Inc., Term Loan, First Lien		7.308%		3-Month LIBOR		5.000%		4/01/21		B		3,147,873
	333	iQor US, Inc., Term Loan, Second Lien		11.058%		3-Month LIBOR		8.750%		4/01/22		CCC+		321,668
	964	KAR Auction Services, Inc., Term Loan B5		4.813%		3-Month LIBOR		2.500%		3/09/23		Ba2		970,273
	1,000	LSC Communications, Refinancing Term Loan		7.401%		1-Month LIBOR		5.500%		9/30/22		B1		1,006,250
	2,955	Monitronics International, Inc., Term Loan B2, First Lien		7.802%		3-Month LIBOR		5.500%		9/30/22		B2		2,868,995
	2,264	Protection One, Inc., Term Loan		4.651%		1-Month LIBOR		2.750%		5/02/22		BB–		2,281,047
	2,805	Skillsoft Corporation, Initial Term Loan, First Lien, (DD1)		6.627%		1-Month LIBOR		4.750%		4/28/21		B–		2,667,349
	1,470	Universal Services of America, Initial Term Loan, First Lien		6.052%		3-Month LIBOR		3.750%		7/28/22		B+		1,444,885
	1,750	Universal Services of America, Term Loan, Second Lien		10.401%		1-Month LIBOR		8.500%		7/28/23		B–		1,735,239
	1,132	West Corporation, Term Loan B		5.901%		1-Month LIBOR		4.000%		10/10/24		Ba3		1,142,526
	257	West Corporation, Term Loan B12		5.901%		1-Month LIBOR		4.000%		10/10/24		Ba3		257,168
	20,771	Total Commercial Services & Supplies												20,505,293

		Communications Equipment – 0.3% (0.2% of Total Investments)

	1,493	Mitel US Holdings, Inc., Incremental Term Loan		5.651%		1-Month LIBOR		3.750%		9/25/23		B+		1,504,940

		Construction & Engineering – 0.7% (0.4% of Total Investments)

	1,500	KBR, Inc., Term Loan B, (WI/DD)		TBD		TBD		TBD		TBD		B+		1,513,125
	1,594	Traverse Midstream Partners, Term Loan B		5.850%		6-Month LIBOR		4.000%		9/27/24		B+		1,605,297
	3,094	Total Construction & Engineering												3,118,422

		Containers & Packaging – 0.5% (0.3% of Total Investments)

	1,116	Berry Global, Inc., Term Loan Q		3.899%		1-Month LIBOR		2.000%		10/01/22		BBB–		1,124,468
	990	Reynolds Group Holdings, Inc., Term Loan, First Lien		4.651%		1-Month LIBOR		2.750%		2/05/23		B+		997,588
	2,106	Total Containers & Packaging												2,122,056

		Distributors – 0.2% (0.1% of Total Investments)

	971	American Seafoods Group LLC, Term Loan B		4.650%		1-Month LIBOR		2.750%		8/21/23		BB–		974,275

		Diversified Consumer Services – 2.2% (1.3% of Total Investments)

	4,967	Cengage Learning Acquisitions, Inc., Term Loan B		6.147%		1-Month LIBOR		4.250%		6/07/23		B		4,463,750
	220	Education Management LLC, Tranche A, Term Loan, (6)		0.000%		N/A		N/A		7/02/20		N/R		49,265
	496	Education Management LLC, Tranche B, Term Loan, (6)		0.000%		N/A		N/A		7/02/20		N/R		7,126
	3,404	Houghton Mifflin, Term Loan B, First Lien		4.901%		1-Month LIBOR		3.000%		5/28/21		B		3,161,322
	1,354	Laureate Education, Inc., New Term Loan		5.401%		1-Month LIBOR		3.500%		4/26/24		B+		1,365,064
	940	Vertiv Co., Term Loan B		5.887%		1-Month LIBOR		4.000%		11/30/23		Ba3		940,782
	11,381	Total Diversified Consumer Services												9,987,309

		Diversified Financial Services – 1.9% (1.2% of Total Investments)

	2,737	Citco III Limited, Term Loan		4.901%		1-Month LIBOR		3.000%		3/31/22		N/R		2,766,383
	1,152	Freedom Mortgage Corporation, Term Loan B		6.648%		1-Month LIBOR		4.750%		2/23/22		B+		1,169,719
	1,694	Travelport LLC, Term Loan B		4.401%		2-Month LIBOR		2.500%		3/17/25		B+		1,702,686
	3,080	Veritas US, Inc., Term Loan B1		6.802%		3-Month LIBOR		4.500%		1/27/23		B+		3,039,302
	8,663	Total Diversified Financial Services												8,678,090

		Diversified Telecommunication Services – 7.7% (4.9% of Total Investments)

	1,481	CenturyLink, Inc., Initial Term A Loan		4.651%		1-Month LIBOR		2.750%		11/01/22		BBB–		1,478,658
	7,285	CenturyLink, Inc., Term Loan B		4.651%		1-Month LIBOR		2.750%		1/31/25		BBB–		7,187,519
	4,470	Frontier Communications Corporation, Term Loan B		5.660%		1-Month LIBOR		3.750%		1/14/22		B+		4,424,502
	2,502	Intelsat Jackson Holdings, S.A., Term Loan B		5.706%		3-Month LIBOR		3.750%		11/30/23		B1		2,521,073
	383	Intelsat Jackson Holdings, S.A., Term Loan B4		6.456%		3-Month LIBOR		4.500%		1/02/24		B1		398,518
	614	Intelsat Jackson Holdings, S.A., Term Loan B5		6.625%		N/A		N/A		1/02/24		B1		626,680
	3,193	Level 3 Financing, Inc., Tranche B, Term Loan		4.148%		1-Month LIBOR		2.250%		2/22/24		BBB–		3,210,562
	547	Presidio, Inc., Term Loan B		5.049%		3-Month LIBOR		2.750%		2/02/24		B+		550,302
	5,772	WideOpenWest Finance LLC, Term Loan B		5.146%		1-Month LIBOR		3.250%		8/18/23		B		5,591,329
	889	Windstream Corporation, Term Loan B6		5.900%		1-Month LIBOR		4.000%		3/29/21		B+		852,782
	9,000	Ziggo B.V., Term Loan E		4.397%		1-Month LIBOR		2.500%		4/15/25		BB–		8,968,140
	36,136	Total Diversified Telecommunication Services												35,810,065


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Electric Utilities – 0.9% (0.6% of Total Investments)

$	662	EFS Cogen Holdings LLC, Term Loan B		5.560%		3-Month LIBOR		3.250%		6/28/23		BB	$	666,549
	691	Helix Generation, Term Loan B		5.651%		1-Month LIBOR		3.750%		6/03/24		BB		698,031
	2,412	Vistra Operations Co., Term Loan B		4.401%		1-Month LIBOR		2.500%		8/04/23		BB+		2,431,922
	429	Vistra Operations Co., Term Loan C		4.401%		1-Month LIBOR		2.500%		8/04/23		BB+		432,054
	4,194	Total Electric Utilities												4,228,556

		Electrical Equipment – 0.7% (0.4% of Total Investments)

	1,363	TTM Technologies, Inc., Term Loan B, (DD1)		4.377%		1-Month LIBOR		2.500%		9/28/24		BB+		1,373,840
	1,816	Zebra Technologies Corporation, Term Loan B		4.362%		3-Month LIBOR		2.000%		10/27/21		BB		1,830,715
	3,179	Total Electrical Equipment												3,204,555

		Energy Equipment & Services – 0.6% (0.3% of Total Investments)

	2,105	Diversey, Inc., Term Loan B		4.994%		2-Month LIBOR		3.000%		9/06/24		B1		2,105,714
	717	Dynamic Energy Services International LLC, Term Loan, (cash 15.278%, PIK 13.500%)		15.278%		3-Month LIBOR		13.500%		6/06/18		N/R		254,531
	258	Ocean Rig UDW, Inc., Term Loan		8.000%		N/A		N/A		9/20/24		Caa1		271,423
	3,080	Total Energy Equipment & Services												2,631,668

		Equity Real Estate Investment Trusts – 2.5% (1.5% of Total Investments)

	4,628	Communications Sales & Leasing, Inc., Shortfall Term Loan		4.901%		1-Month LIBOR		3.000%		10/24/22		B		4,473,832
	1,000	Realogy Group LLC, Term Loan A		3.895%		1-Month LIBOR		2.000%		10/23/20		N/R		1,001,665
	1,264	Realogy Group LLC, Term Loan B		4.145%		1-Month LIBOR		2.250%		2/08/25		BB+		1,273,013
	4,915	Walter Investment Management Corporation, Tranche B, Term Loan, First Lien, (6)		7.901%		1-Month LIBOR		6.000%		6/30/22		B–		4,632,148
	11,807	Total Equity Real Estate Investment Trusts												11,380,658

		Food & Staples Retailing – 4.2% (2.7% of Total Investments)

	16,838	Albertson’s LLC, Term Loan B4		4.651%		1-Month LIBOR		2.750%		8/25/21		Ba2		16,704,531
	1,328	Albertson’s LLC, Term Loan B6		4.956%		3-Month LIBOR		3.000%		6/22/23		Ba2		1,316,151
	1,099	BJ’s Wholesale Club, Inc., Term Loan B, First Lien		5.391%		1-Month LIBOR		3.500%		2/03/24		B–		1,105,678
	590	Save-A-Lot, Term Loan B		7.901%		1-Month LIBOR		6.000%		12/05/23		B2		513,866
	19,855	Total Food & Staples Retailing												19,640,226

		Food Products – 3.7% (2.3% of Total Investments)

	1,444	Hearthside Group Holdings LLC, Term Loan B		4.901%		1-Month LIBOR		3.000%		6/02/21		B1		1,449,843
	3,437	Jacobs Douwe Egberts, Term Loan B		4.063%		3-Month LIBOR		2.250%		7/04/22		BB		3,468,353
	2,236	Keurig Green Mountain, Inc., Term Loan A, First Lien		3.250%		1-Week LIBOR		1.500%		3/03/21		BBB–		2,235,097
	1,064	Pinnacle Foods Finance LLC, Term Loan B		3.637%		1-Month LIBOR		1.750%		2/02/24		BB+		1,073,416
	8,873	US Foods, Inc., Term Loan B		4.401%		1-Month LIBOR		2.500%		6/27/23		BB		8,964,855
	17,054	Total Food Products												17,191,564

		Health Care Equipment & Supplies – 1.7% (1.0% of Total Investments)

	830	Acelity, Term Loan B		5.552%		3-Month LIBOR		3.250%		2/02/24		B1		837,042
	867	ConvaTec, Inc., Term Loan B		4.552%		3-Month LIBOR		2.250%		10/25/23		BB		873,402
	1,205	Greatbatch, New Term Loan B		5.150%		1-Month LIBOR		3.250%		10/27/22		B+		1,217,610
	1,861	Onex Carestream Finance LP, Term Loan, First Lien		5.901%		1-Month LIBOR		4.000%		6/07/19		B1		1,874,365
	2,240	Onex Carestream Finance LP, Term Loan, Second Lien		10.401%		1-Month LIBOR		8.500%		12/07/19		B–		2,239,933
	750	Vyaire Medical, Inc., Term Loan B		7.232%		6-Month LIBOR		4.750%		4/16/25		B2		731,250
	7,753	Total Health Care Equipment & Supplies												7,773,602

		Health Care Providers & Services – 5.6% (3.5% of Total Investments)

	2,283	Air Medical Group Holdings, Inc., Term Loan B		5.128%		1-Month LIBOR		3.250%		4/28/22		B1		2,295,812
	2,494	Air Medical Group Holdings, Inc., Term Loan B		6.147%		1-Month LIBOR		4.250%		3/14/25		B1		2,523,625
	828	Community Health Systems, Inc., Term Loan G		4.984%		3-Month LIBOR		3.000%		12/31/19		B2		816,774
	1,476	Community Health Systems, Inc., Term Loan H		5.234%		3-Month LIBOR		3.250%		1/27/21		B2		1,435,749
	1,424	Concentra, Inc., Term Loan B		4.530%		3-Month LIBOR		2.750%		6/01/22		B+		1,438,354
	958	Envision Healthcare Corporation, Term Loan B, First Lien		4.910%		1-Month LIBOR		3.000%		12/01/23		BB–		963,437
	1,562	HCA, Inc., Term Loan A5		3.401%		1-Month LIBOR		1.500%		6/10/20		BBB–		1,572,823
	1,661	HCA, Inc., Term Loan B11		3.651%		1-Month LIBOR		1.750%		3/17/23		BBB–		1,672,248
	1,138	Healogics, Inc., Term Loan, First Lien		6.280%		3-Month LIBOR		4.250%		7/01/21		B–		1,025,539
	79	Heartland Dental Care, Inc., Delay Draw Facility, (WI/DD)		TBD		TBD		TBD		TBD		B2		79,719


JRO		Nuveen Floating Rate Income Opportunity Fund (continued)
JRO		Portfolio of Investments April 30, 2018
		(Unaudited)


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Health Care Providers & Services (continued)

$	529	Heartland Dental Care, Inc., Term Loan, First Lien, (WI/DD)		TBD		TBD		TBD		TBD		B2	$	531,463
	2,703	Millennium Laboratories, Inc., Term Loan B, First Lien		8.401%		1-Month LIBOR		6.500%		12/21/20		CCC+		962,248
	1,262	MultiPlan, Inc., Term Loan B		5.052%		3-Month LIBOR		2.750%		6/07/23		B+		1,270,225
	4,385	Pharmaceutical Product Development, Inc., Term Loan B		4.611%		3-Month LIBOR		2.500%		8/18/22		Ba3		4,414,618
	1,250	PharMerica, Term Loan, First Lien		5.395%		1-Month LIBOR		3.500%		12/06/24		B1		1,257,813
	1,000	Prospect Medical Holdings, Term Loan B1		7.438%		1-Month LIBOR		5.500%		2/22/24		B1		1,007,500
	205	Quorum Health Corp., Term Loan B		8.651%		1-Month LIBOR		6.750%		4/29/22		B1		210,341
	2,408	Select Medical Corporation, Term Loan B		4.651%		1-Month LIBOR		2.750%		3/01/21		Ba2		2,434,810
	223	Vizient, Inc., New Term Loan B		4.651%		1-Month LIBOR		2.750%		2/13/23		BB–		224,385
	27,868	Total Health Care Providers & Services												26,137,483

		Health Care Technology – 1.6% (1.0% of Total Investments)

	1,793	Catalent Pharma Solutions, Inc., Term Loan B		4.151%		1-Month LIBOR		2.250%		5/20/24		BB		1,803,513
	4,950	Emdeon, Inc., Term Loan		4.651%		1-Month LIBOR		2.750%		3/01/24		Ba3		4,975,146
	449	Press Ganey Holdings, Inc., Term Loan, Second Lien		8.401%		1-Month LIBOR		6.500%		10/21/24		CCC+		455,058
	7,192	Total Health Care Technology												7,233,717

		Hotels, Restaurants & Leisure – 11.4% (7.2% of Total Investments)

	998	Aramark Corporation, Term Loan B1		3.901%		1-Month LIBOR		2.000%		3/11/25		BBB–		1,005,759
	750	Arby’s Restaurant Group, Inc., Term Loan B		5.194%		2-Month LIBOR		3.250%		2/05/25		B1		759,259
	14,829	Burger King Corporation, Term Loan B3		4.151%		1-Month LIBOR		2.250%		2/16/24		Ba3		14,889,341
	3,945	Caesars Entertainment Operating Company, Inc., Term Loan B		3.901%		1-Month LIBOR		2.000%		10/06/24		BB		3,957,726
	2,992	Caesars Resort Collection, Term Loan, First Lien		4.651%		1-Month LIBOR		2.750%		12/23/24		BB		3,020,345
	1,644	CCM Merger, Inc., Term Loan B		4.651%		1-Month LIBOR		2.750%		8/09/21		BB–		1,657,987
	3,282	CityCenter Holdings LLC, Term Loan B		4.401%		1-Month LIBOR		2.500%		4/18/24		BB–		3,302,234
	5,115	Hilton Hotels Corporation, Term Loan B2		3.647%		1-Month LIBOR		1.750%		10/25/23		BBB–		5,162,418
	2,950	Intrawest Resorts Holdings, Inc., Term Loan B		4.901%		1-Month LIBOR		3.000%		7/31/24		B		2,975,078
	1,960	Life Time Fitness, Inc., Term Loan B		4.734%		3-Month LIBOR		2.750%		6/10/22		BB–		1,968,511
	2,264	MGM Growth Properties, Term Loan B		3.901%		1-Month LIBOR		2.000%		4/25/25		BB+		2,279,319
	7,710	Scientific Games Corp., Initial Term Loan B5		4.726%		2-Month LIBOR		2.750%		8/14/24		Ba3		7,766,269
	2,603	Station Casino LLC, Term Loan B		4.410%		1-Month LIBOR		2.500%		6/08/23		BB		2,615,351
	1,500	Wyndham International, Inc., Term Loan B, (WI/DD)		TBD		TBD		TBD		TBD		BBB–		1,513,508
	52,542	Total Hotels, Restaurants & Leisure												52,873,105

		Household Products – 0.8% (0.5% of Total Investments)

	3,172	Revlon Consumer Products Corporation, Term Loan B, First Lien		5.401%		1-Month LIBOR		3.500%		11/16/20		B3		2,460,000
	1,190	Serta Simmons Holdings LLC, Term Loan, First Lien		5.695%		3-Month LIBOR		3.500%		11/08/23		B2		1,079,337
	4,362	Total Household Products												3,539,337

		Independent Power & Renewable Electricity Producers – 0.7% (0.5% of Total Investments)

	944	Dynegy, Inc., Tranche Term Loan C2		4.398%		1-Month LIBOR		2.500%		2/07/24		Ba1		951,277
	2,500	NRG Energy, Inc., Term Loan B, (DD1)		4.052%		3-Month LIBOR		1.750%		6/30/23		Baa3		2,509,262
	3,444	Total Independent Power & Renewable Electricity Producers												3,460,539

		Industrial Conglomerates – 0.9% (0.6% of Total Investments)

	2,001	Brand Energy & Infrastructure Services, Inc., Term Loan B, First Lien		6.611%		3-Month LIBOR		4.250%		6/16/24		B		2,023,766
	1,000	Education Adisory Board, Term Loan, First Lien		6.252%		2-Month LIBOR		3.750%		11/15/24		B		1,005,000
	1,208	Foresight Energy LLC, Term Loan, First Lien		8.109%		3-Month LIBOR		5.750%		3/28/22		B		1,184,930
	4,209	Total Industrial Conglomerates												4,213,696

		Insurance – 1.7% (1.1% of Total Investments)

	743	Acrisure LLC, Term Loan B		6.609%		3-Month LIBOR		4.250%		11/22/23		B		754,046
	3,835	Alliant Holdings I LLC, Term Loan B, (DD1)		4.929%		1-Month LIBOR		3.250%		4/27/25		B		3,863,935
	3,225	Hub International Holdings, Inc., Term Loan B, (WI/DD)		TBD		TBD		TBD		TBD		B		3,248,386
	7,803	Total Insurance												7,866,367

		Internet and Direct Marketing Retail – 0.3% (0.2% of Total Investments)

	1,500	Uber Technologies, Inc., Term Loan		5.890%		1-Month LIBOR		4.000%		4/04/25		N/R		1,517,032


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Internet Software & Services – 1.9% (1.2% of Total Investments)

$	1,474	Ancestry.com, Inc., Term Loan, First Lien		5.150%		1-Month LIBOR		3.250%		10/19/23		B	$	1,485,496
	1,000	GTT Communications, Inc., Term Loan, First Lien, (WI/DD)		TBD		TBD		TBD		TBD		B		994,220
	1,140	Rackspace Hosting, Inc., Refinancing Term B Loan, First Lien		4.787%		1-Month LIBOR		3.000%		11/03/23		BB–		1,138,819
	3,651	Sabre, Inc., Term Loan B		3.901%		1-Month LIBOR		2.000%		2/22/24		Ba2		3,669,112
	1,913	SkillSoft Corporation, Term Loan, Second Lien		10.127%		1-Month LIBOR		8.250%		4/28/22		CCC		1,635,137
	9,178	Total Internet Software & Services												8,922,784

		IT Services – 4.3% (2.7% of Total Investments)

	771	DigiCert, Term Loan, First Lien		6.651%		1-Month LIBOR		4.750%		10/31/24		B		774,329
	963	Engility Corporation, Term Loan B2		4.682%		1-Month LIBOR		2.750%		8/11/23		BB–		964,148
	1,000	First Data Corporation, Term Loan A		3.647%		1-Month LIBOR		1.750%		6/02/20		BB		1,002,250
	1,832	First Data Corporation, Term Loan, First Lien		4.147%		1-Month LIBOR		2.250%		7/10/22		BB		1,840,977
	7,170	First Data Corporation, Term Loan, First Lien		4.147%		1-Month LIBOR		2.250%		4/26/24		BB		7,203,201
	1,206	Gartner, Inc., Term Loan A		3.901%		1-Month LIBOR		2.000%		3/21/22		BB+		1,216,320
	143	Gartner, Inc., Term Loan B		3.901%		1-Month LIBOR		2.000%		4/05/24		BB+		143,703
	2,500	Optiv Security, Inc., Term Loan, Second Lien		9.125%		1-Month LIBOR		7.250%		1/31/25		Caa1		2,403,125
	474	PEAK 10, Inc., Term Loan B		5.802%		3-Month LIBOR		3.500%		8/01/24		B		474,704
	1,737	Tempo Acquisition LLC, Term Loan B		4.901%		1-Month LIBOR		3.000%		5/01/24		B1		1,748,998
	1,000	Vantiv, Inc., Term Loan B		3.896%		1-Month LIBOR		2.000%		8/09/24		BBB–		1,007,810
	983	WEX, Inc., Term Loan B		4.151%		1-Month LIBOR		2.250%		7/01/23		BB–		990,208
	19,779	Total IT Services												19,769,773

		Leisure Products – 1.3% (0.8% of Total Investments)

	1,539	24 Hour Fitness Worldwide, Inc., Term Loan B		6.052%		3-Month LIBOR		3.750%		5/28/21		Ba3		1,550,040
	958	Academy, Ltd., Term Loan B		5.928%		3-Month LIBOR		4.000%		7/01/22		B3		761,818
	1,831	Equinox Holdings, Inc., Term Loan B1		4.901%		1-Month LIBOR		3.000%		3/08/24		B+		1,844,949
	988	Four Seasons Holdings, Inc., Term Loan B		3.901%		1-Month LIBOR		2.000%		11/30/23		BB		995,800
	1,000	Zodiac Pool Solutions LLC, Term Loan, Second Lien		11.302%		3-Month LIBOR		9.000%		12/20/24		CCC+		1,012,500
	6,316	Total Leisure Products												6,165,107

		Life Sciences Tools & Services – 0.3% (0.2% of Total Investments)

	557	Inventiv Health, Inc., Term Loan B		4.127%		1-Month LIBOR		2.250%		8/01/24		BB–		560,032
	995	Parexel International Corp., Term Loan B		4.651%		1-Month LIBOR		2.750%		9/27/24		B1		999,512
	1,552	Total Life Sciences Tools & Services												1,559,544

		Machinery – 1.1% (0.7% of Total Investments)

	2,396	Gardner Denver, Inc., Term Loan B		5.052%		3-Month LIBOR		2.750%		7/30/24		B+		2,412,899
	1,050	Gates Global LLC, Term Loan B		5.052%		3-Month LIBOR		2.750%		4/01/24		B+		1,057,553
	998	Navistar, Inc., Tranche B, Term Loan		5.400%		1-Month LIBOR		3.500%		11/06/24		Ba3		1,005,450
	415	Rexnord LLC/ RBS Global, Inc., Term Loan, First Lien		4.148%		1-Month LIBOR		2.250%		8/21/24		BB+		418,012
	4,859	Total Machinery												4,893,914

		Marine – 0.1% (0.1% of Total Investments)

	900	American Commercial Lines LLC, Term Loan B, First Lien		10.651%		1-Month LIBOR		8.750%		11/12/20		CCC+		528,021

		Media – 14.3% (9.0% of Total Investments)

	1,151	Advantage Sales & Marketing, Inc., Term Loan, First Lien		5.151%		1-Month LIBOR		3.250%		7/23/21		B1		1,104,444
	1,485	Affinion Group Holdings, Inc., Term Loan, First Lien		9.561%		3-Month LIBOR		7.750%		5/10/22		B2		1,544,096
	4,658	Catalina Marketing Corporation, Term Loan, First Lien		5.401%		1-Month LIBOR		3.500%		4/09/21		B2		2,927,629
	1,500	Catalina Marketing Corporation, Term Loan, Second Lien		8.651%		1-Month LIBOR		6.750%		4/11/22		Caa2		315,750
	5,390	Cequel Communications LLC, Term Loan B		4.151%		1-Month LIBOR		2.250%		7/28/25		BB		5,394,191
	3,930	Charter Communications Operating Holdings LLC, Term Loan B		3.910%		1-Month LIBOR		2.000%		4/30/25		BBB–		3,952,257
	3,000	Cineworld Group PLC, Term Loan B		4.401%		1-Month LIBOR		2.500%		2/28/25		BB–		2,999,685
	7,296	Clear Channel Communications, Inc., Term Loan E, (6)		9.802%		3-Month LIBOR		7.500%		7/30/19		Caa2		5,819,446
	5,014	Clear Channel Communications, Inc., Tranche D, Term Loan, (6)		9.052%		3-Month LIBOR		6.750%		1/30/19		Caa2		4,006,962
	1,500	CSC Holdings LLC, Term Loan B		4.277%		1-Month LIBOR		2.500%		1/25/26		Ba2		1,502,813
	8,848	Cumulus Media, Inc., Term Loan B, (6)		5.160%		1-Month LIBOR		3.250%		12/23/20		N/R		7,509,759


JRO		Nuveen Floating Rate Income Opportunity Fund (continued)
JRO		Portfolio of Investments April 30, 2018
		(Unaudited)


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Media (continued)

$	1,592	Getty Images, Inc., Term Loan B, First Lien		5.802%		3-Month LIBOR		3.500%		10/18/19		B3	$	1,515,758
	589	Gray Television, Inc., Term Loan B2		4.137%		1-Month LIBOR		2.250%		2/07/24		BB		592,410
	1,926	IMG Worldwide, Inc., Term Loan, First Lien		5.160%		1-Month LIBOR		3.250%		5/06/21		B+		1,941,916
	636	Lions Gate Entertainment Corp., Term Loan B		4.148%		1-Month LIBOR		2.250%		3/24/25		Ba2		639,318
	5,167	McGraw-Hill Education Holdings LLC, Term Loan B		5.901%		1-Month LIBOR		4.000%		5/02/22		B+		5,078,781
	2,333	Meredith, Term Loan B		4.901%		1-Month LIBOR		3.000%		1/31/25		BB		2,351,568
	457	Nexstar Broadcasting Group, Term Loan		4.387%		1-Month LIBOR		2.500%		1/17/24		BB+		459,378
	3,557	Nexstar Broadcasting Group, Term Loan B		4.387%		1-Month LIBOR		2.500%		1/17/24		BB+		3,576,695
	746	Red Ventures, Term Loan B		5.901%		1-Month LIBOR		4.000%		11/08/24		B+		756,418
	1,750	Sinclair Television Group, Term Loan B2, (WI/DD)		TBD		TBD		TBD		TBD		BB+		1,758,750
	1,943	Springer Science & Business Media, Inc., Term Loan B13, First Lien		5.330%		1-Month LIBOR		3.500%		8/15/22		B		1,951,180
	7,677	Univision Communications, Inc., Term Loan C5		4.651%		1-Month LIBOR		2.750%		3/15/24		BB–		7,585,187
	227	Yell Group PLC, Term Loan A2, First Lien		8.000%		3-Month LIBOR		7.000%		9/07/21		N/R		228,454
	229	Yell Group PLC, Term Loan B2, First Lien		8.500%		N/A		N/A		9/07/65		N/R		653,430
	72,601	Total Media												66,166,275

		Metals & Mining – 0.6% (0.3% of Total Investments)

	1,241	CanAm Construction, Inc., Term Loan B		7.401%		1-Month LIBOR		5.500%		7/01/24		B		1,256,133
	1,378	Zekelman Industries, Term Loan B		4.999%		3-Month LIBOR		2.750%		6/14/21		BB–		1,387,641
	2,619	Total Metals & Mining												2,643,774

		Multiline Retail – 0.7% (0.5% of Total Investments)

	1,187	Belk, Inc., Term Loan B, First Lien		7.088%		3-Month LIBOR		4.750%		12/12/22		B2		1,014,184
	1,500	EG America LLC, Term Loan, First Lien, (WI/DD)		TBD		TBD		TBD		TBD		B		1,501,500
	922	Hudson’s Bay Company, Term Loan B, First Lien		5.150%		1-Month LIBOR		3.250%		9/30/22		BB		877,493
	3,609	Total Multiline Retail												3,393,177

		Oil, Gas & Consumable Fuels – 4.1% (2.6% of Total Investments)

	1,455	BCP Renaissance Parent, Term Loan B		5.863%		3-Month LIBOR		4.000%		10/31/24		B+		1,463,636
	1,250	California Resources Corporation, Term Loan		12.273%		1-Month LIBOR		10.375%		12/31/21		B		1,410,938
	1,400	California Resources Corporation, Term Loan B		6.647%		1-Month LIBOR		4.750%		12/31/22		B		1,435,000
	241	Energy and Exploration Partners, Term Loan, Second Lien, (6)		5.000%		N/A		N/A		5/13/22		N/R		3,609
	2,551	Fieldwood Energy LLC, Exit Term Loan		7.151%		1-Month LIBOR		5.250%		4/11/22		B+		2,568,319
	1,660	Fieldwood Energy LLC, Exit Term Loan, second Lien		9.151%		1-Month LIBOR		7.250%		4/11/23		B+		1,608,237
	2,901	Harvey Gulf International Marine, Inc., Term Loan, (6)		0.000%		N/A		N/A		6/18/18		D		1,145,834
	401	Harvey Gulf International Marine, Inc., Term Loan A, (6), (WI/DD)		TBD		TBD		TBD		TBD		D		156,523
	3,753	Harvey Gulf International Marine, Inc., Term Loan B, (6), (DD1)		0.000%		N/A		N/A		6/18/20		D		1,473,022
	3,000	McDermott International, Term Loan, (WI/DD)		TBD		TBD		TBD		TBD		Ba2		2,985,480
	1,215	Peabody Energy Corporation, Term Loan B		4.651%		1-Month LIBOR		2.750%		3/31/25		BB		1,220,034
	3,942	Seadrill Partners LLC, Initial Term Loan, (DD1)		8.302%		3-Month LIBOR		6.000%		2/21/21		CCC+		3,388,795
	45	Southcross Holdings Borrower L.P., Term Loan B, First Lien, (cash 3.500%, PIK 5.500%)		3.500%		N/A		N/A		4/13/23		CCC+		44,689
	23,814	Total Oil, Gas & Consumable Fuels												18,904,116

		Personal Products – 0.7% (0.4% of Total Investments)

	1,750	Coty, Inc., Term Loan A		3.628%		1-Month LIBOR		1.750%		4/05/23		BB+		1,747,813
	1,500	Coty, Inc., Term Loan B		4.128%		1-Month LIBOR		2.250%		4/07/25		BB+		1,501,470
	3,250	Total Personal Products												3,249,283

		Pharmaceuticals – 0.6% (0.4% of Total Investments)

	570	Alphabet Holding Company, Inc., Initial Term Loan, First Lien, (WI/DD)		TBD		TBD		TBD		TBD		B–		497,325
	2,347	Concordia Healthcare Corporation, Term Loan B, First Lien		6.151%		1-Month LIBOR		4.250%		10/21/21		Caa2		2,138,360
	44	Valeant Pharmaceuticals International, Inc., Term Loan B		5.394%		1-Month LIBOR		3.500%		4/01/22		BB–		44,164
	2,961	Total Pharmaceuticals												2,679,849


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Professional Services – 2.1% (1.3% of Total Investments)

$	1,066	Ceridian HCM Holding, Inc., Term Loan B, (WI/DD)		TBD		TBD		TBD		TBD		B–	$	1,071,375
	5,496	Formula One Group, Term Loan B		4.401%		1-Month LIBOR		2.500%		2/01/24		B+		5,494,883
	1,980	Nielsen Finance LLC, Term Loan B4		3.895%		1-Month LIBOR		2.000%		10/04/23		BBB–		1,993,147
	957	On Assignment, Inc., Term Loan B		3.901%		1-Month LIBOR		2.000%		4/02/25		BB		963,405
	9,499	Total Professional Services												9,522,810

		Real Estate Management & Development – 1.5% (0.9% of Total Investments)

	750	Altisource Solutions S.A R.L., Term Loan B		6.308%		3-Month LIBOR		4.000%		3/29/24		B+		747,499
	2,023	Capital Automotive LP, Term Loan, First Lien		4.410%		1-Month LIBOR		2.500%		3/25/24		B1		2,034,963
	2,443	Capital Automotive LP, Term Loan, Second Lien		7.910%		1-Month LIBOR		6.000%		3/24/25		B3		2,479,477
	1,500	Trico Group LLC, Term Loan, First Lien		8.484%		3-Month LIBOR		6.500%		2/02/24		B		1,515,000
	6,716	Total Real Estate Management & Development												6,776,939

		Road & Rail – 0.3% (0.2% of Total Investments)

	1,466	Quality Distribution, Incremental Term Loan, First Lien		7.802%		3-Month LIBOR		5.500%		8/18/22		B2		1,485,795

		Semiconductors & Semiconductor Equipment – 1.4% (0.9% of Total Investments)

	1,062	Cypress Semiconductor Corp, Term Loan B		4.150%		1-Month LIBOR		2.250%		7/05/21		BB		1,074,756
	1,281	Lumileds, Term Loan B		5.732%		3-Month LIBOR		3.500%		6/30/24		Ba3		1,301,024
	1,228	Micron Technology, Inc., Term Loan B		4.113%		1-Month LIBOR		1.750%		4/10/22		Baa2		1,239,639
	1,387	Microsemi Corporation, Term Loan B		3.898%		1-Month LIBOR		2.000%		1/15/23		BB		1,391,959
	1,515	On Semiconductor Corp., Term Loan B		3.901%		1-Month LIBOR		2.000%		3/31/23		Baa3		1,526,380
	6,473	Total Semiconductors & Semiconductor Equipment												6,533,758

		Software – 15.1% (9.5% of Total Investments)

	4,589	Avaya Inc., Term Loan, First Lien		6.647%		1-Month LIBOR		4.750%		12/15/24		B		4,644,640
	1,815	Blackboard, Inc., Term Loan B4		6.894%		3-Month LIBOR		5.000%		6/30/21		B		1,716,175
	5,680	BMC Software, Inc., Term Loan, First Lien		5.151%		1-Month LIBOR		3.250%		9/10/22		B+		5,710,659
	4,604	Compuware Corporation, Term Loan B3		5.400%		1-Month LIBOR		3.500%		12/15/21		B		4,668,184
	985	DTI Holdings, Inc., Replacement Term Loan B1		6.711%		2-Month LIBOR		4.750%		9/29/23		B		989,833
	2,156	Ellucian, Term Loan B, First Lien		5.552%		3-Month LIBOR		3.250%		9/30/22		B		2,169,095
	2,963	Greeneden U.S. Holdings II LLC, Term Loan B		5.802%		3-Month LIBOR		3.500%		12/01/23		B		2,984,870
	10,021	Infor (US), Inc., Term Loan B		4.651%		1-Month LIBOR		2.750%		2/01/22		B1		10,079,565
	1,677	Informatica, Term Loan B		5.151%		1-Month LIBOR		3.250%		8/05/22		B		1,690,848
	1,238	Kronos Incorporated, Term Loan B		4.880%		2-Month LIBOR		3.000%		11/20/23		B		1,249,719
	750	McAfee Holdings International, Inc., Term Loan, Second Lien		10.401%		1-Month LIBOR		8.500%		9/29/25		B–		763,594
	3,189	McAfee LLC, Term Loan		6.401%		1-Month LIBOR		4.500%		9/30/24		B1		3,234,843
	901	Micro Focus International PLC, New Term Loan		4.651%		1-Month LIBOR		2.750%		6/21/24		BB–		899,577
	6,082	Micro Focus International PLC, Term Loan B		4.651%		1-Month LIBOR		2.750%		6/21/24		BB–		6,075,067
	2,936	Micro Focus International PLC, Term Loan B2		4.401%		1-Month LIBOR		2.500%		11/19/21		BB–		2,938,373
	636	Misys, New Term Loan, Second Lien		9.234%		3-Month LIBOR		7.250%		6/13/25		CCC+		629,895
	56	Mitchell International, Inc., Delayed Draw Term Loan, First Lien, (5)		0.500%		N/A		N/A		11/29/24		B1		56,046
	694	Mitchell International, Inc., Initial Term Loan, First Lien		5.151%		1-Month LIBOR		3.250%		11/29/24		B1		694,970
	1,000	Mitchell International, Inc., Initial Term Loan, Second Lien		9.151%		1-Month LIBOR		7.250%		12/01/25		CCC		1,006,000
	1,481	RP Crown Parent, LLC, Term Loan B		4.651%		1-Month LIBOR		2.750%		10/15/23		B1		1,493,744
	4,578	SS&C Technologies, Inc./ Sunshine Acquisition II, Inc., Term Loan B3		4.401%		1-Month LIBOR		2.500%		4/16/25		BB		4,614,097
	1,694	SS&C Technologies, Inc./ Sunshine Acquisition II, Inc., Term Loan B4		4.401%		1-Month LIBOR		2.500%		4/16/25		BB		1,707,168
	7,847	Tibco Software, Inc., Term Loan, First Lien		5.410%		1-Month LIBOR		3.500%		12/04/20		B1		7,909,226
	750	Uber Technologies, Inc., Term Loan B, First Lien, (WI/DD)		TBD		TBD		TBD		TBD		N/R		756,952
	1,108	Vertafore, Inc., Term Loan, First Lien		5.151%		1-Month LIBOR		3.250%		6/30/23		B		1,118,669
	69,430	Total Software												69,801,809

		Specialty Retail – 1.7% (1.1% of Total Investments)

	2,276	99 Cents Only Stores, Tranche B2, Term Loan, Second Lien, (cash 8.661%, PIK 1.500%)		8.661%		3-Month LIBOR		6.500%		1/13/22		CCC+		2,227,261
	1,018	Neiman Marcus Group, Inc., Term Loan		5.141%		1-Month LIBOR		3.250%		10/25/20		Caa1		897,642
	3,879	Petco Animal Supplies, Inc., Term Loan B1		5.609%		3-Month LIBOR		3.250%		1/26/23		B2		2,674,046
	2,726	Petsmart Inc., Term Loan B, First Lien, (DD1)		4.890%		1-Month LIBOR		3.000%		3/11/22		B1		2,151,167
	9,899	Total Specialty Retail												7,950,116


JRO		Nuveen Floating Rate Income Opportunity Fund (continued)
JRO		Portfolio of Investments April 30, 2018
		(Unaudited)


Principal Amount (000)		Description (1)	Coupon (2)		Reference Rate (2)		Spread (2)		Maturity (3)		Ratings (4)		Value

		Technology Hardware, Storage & Peripherals – 6.2% (3.9% of Total Investments)

$	971	Conduent, Inc., Term Loan B		4.901%		1-Month LIBOR		3.000%		12/07/23		BB+	$	977,485
	5,396	Dell International LLC, Replacement Term Loan A2		3.660%		1-Month LIBOR		1.750%		9/07/21		BBB–		5,409,020
	2,358	Dell International LLC, Replacement Term Loan A3		3.410%		1-Month LIBOR		1.500%		12/31/18		BBB–		2,360,821
	11,440	Dell International LLC, Refinancing Term Loan B		3.910%		1-Month LIBOR		2.000%		9/07/23		BBB–		11,486,326
	1,209	Dell Software Group, Repriced Term Loan B		7.859%		3-Month LIBOR		5.500%		10/31/22		B		1,218,272
	7,051	Western Digital U.S., Term Loan B3		3.900%		1-Month LIBOR		2.000%		4/29/23		Baa2		7,106,013
	28,425	Total Technology Hardware, Storage & Peripherals												28,557,937

		Transportation Infrastructure – 1.9% (1.2% of Total Investments)

	6,857	Avolon, Repriced Term Loan B2		4.147%		1-Month LIBOR		2.250%		3/21/22		BBB–		6,879,571
	83	Ceva Group PLC, Canadian Term Loan		7.859%		3-Month LIBOR		5.500%		3/19/21		B–		82,589
	481	Ceva Group PLC, Dutch B.V., Term Loan		7.859%		3-Month LIBOR		5.500%		3/19/21		B–		479,016
	475	Ceva Group PLC, Synthetic Letter of Credit Term Loan		6.500%		N/A		N/A		3/19/21		B–		473,154
	663	Ceva Group PLC, US Term Loan		7.859%		3-Month LIBOR		5.500%		3/19/21		B–		660,712
	8,559	Total Transportation Infrastructure												8,575,042

		Wireless Telecommunication Services – 4.1% (2.6% of Total Investments)

	1,998	Asurion LLC, Term Loan B4		4.651%		1-Month LIBOR		2.750%		8/04/22		Ba3		2,014,247
	1,831	Asurion LLC, Term Loan B6		4.651%		1-Month LIBOR		2.750%		11/03/23		Ba3		1,846,152
	6,930	Sprint Corporation, Term Loan, First Lien		4.438%		1-Month LIBOR		2.500%		2/02/24		Ba2		6,959,245
	2,800	Syniverse Holdings, Inc., Tranche Term Loan C		6.895%		1-Month LIBOR		5.000%		3/09/23		B		2,834,230
	3,500	Syniverse Holdings, Inc., Initial Term Loan, Second Lien		10.895%		1-Month LIBOR		9.000%		3/11/24		CCC+		3,552,500
	1,841	UPC Financing Partnership, Term Loan AR1, First Lien		4.397%		1-Month LIBOR		2.500%		1/15/26		BB		1,847,035
	18,900	Total Wireless Telecommunication Services												19,053,409
$	618,296	Total Variable Rate Senior Loan Interests (cost $609,194,471)												600,105,143

Principal Amount (000)		Description (1)					Coupon		Maturity		Ratings (4)		Value

		CORPORATE BONDS – 20.0% (12.5% of Total Investments)

		Containers & Packaging – 0.9% (0.6% of Total Investments)

$	4,070	Reynolds Group						5.750%		10/15/20		B+	$	4,099,558

		Diversified Telecommunication Services – 4.6% (2.9% of Total Investments)

	7,222	IntelSat Jackson Holdings						5.500%		8/01/23		CCC+		6,057,452
	5,580	IntelSat Jackson Holdings, 144A						9.750%		7/15/25		CCC+		5,468,400
	501	IntelSat Limited						6.750%		6/01/18		CCC–		495,990
	8,012	IntelSat Limited						7.750%		6/01/21		CCC–		5,428,130
	4,630	IntelSat Limited						8.125%		6/01/23		CCC–		2,893,750
	750	Level 3 Financing Inc.						5.375%		8/15/22		BB		753,750
	26,695	Total Diversified Telecommunication Services												21,097,472

		Equity Real Estate Investment Trusts – 0.7% (0.4% of Total Investments)

	3,250	Realogy Group LLC / Realogy Co-Issuer Corporation, 144A						5.250%		12/01/21		B1		3,282,500

		Health Care Providers & Services – 1.0% (0.6% of Total Investments)

	4,500	HCA Inc.						6.500%		2/15/20		BBB–		4,702,500

		Hotels, Restaurants & Leisure – 1.2% (0.7% of Total Investments)

	1,000	MGM Resorts International Inc.						5.250%		3/31/20		BB		1,022,500
	4,200	Scientific Games International Inc.						10.000%		12/01/22		B–		4,525,542
	5,200	Total Hotels, Restaurants & Leisure												5,548,042

		Household Durables – 1.9% (1.2% of Total Investments)

	2,150	Lennar Corporation, 144A						8.375%		5/16/18		BB+		2,150,000
	4,900	Lennar Corporation						4.125%		12/01/18		BB+		4,900,000
	1,500	Lennar Corporation						4.500%		11/15/19		BB+		1,516,875
	8,550	Total Household Durables												8,566,875


Principal Amount (000)		Description (1)	Coupon		Maturity		Ratings (4)		Value

		Media – 4.3% (2.7% of Total Investments)

$	150	Charter Communications Operating LLC/ Charter Communications Operating Capital Corporation		3.579%		7/23/20		BBB–	$	150,375
	11,043	Clear Channel Communications Inc., (6), (7)		12.000%		8/01/21		N/R		—
	2,000	Dish DBS Corporation		5.125%		5/01/20		BB		1,990,000
	1,000	Dish DBS Corporation		5.875%		11/15/24		BB		855,000
	1,325	Hughes Satellite Systems Corporation		6.500%		6/15/19		BBB–		1,364,750
	4,662	iHeartCommunications, Inc., (6)		9.000%		12/15/19		Caa2		3,729,600
	14,960	iHeartCommunications, Inc., (cash 12.000%, PIK 2.000%), (6)		14.000%		2/01/21		C		1,937,422
	1,714	iHeartCommunications, Inc., 144A, (6)		11.250%		3/01/21		Caa2		1,306,925
	6,250	iHeartCommunications, Inc., (6)		9.000%		3/01/21		Caa2		4,984,375
	1,365	Neptune Finco Corporation, 144A		10.125%		1/15/23		B2		1,513,444
	1,650	Neptune Finco Corporation, 144A		10.875%		10/15/25		B2		1,934,625
	46,119	Total Media								19,766,516

		Oil, Gas & Consumable Fuels – 1.6% (1.0% of Total Investments)

	5,170	California Resources Corporation, 144A		8.000%		12/15/22		CCC+		4,446,200
	500	Denbury Resources Inc.		6.375%		8/15/21		CCC–		452,500
	1,814	Denbury Resources Inc., 144A		9.250%		3/31/22		B		1,886,560
	600	EP Energy LLC and Everest Acquisition Finance, Inc., 144A		9.375%		5/01/24		Caa2		459,000
	8,084	Total Oil, Gas & Consumable Fuels								7,244,260

		Pharmaceuticals – 0.0% (0.0% of Total Investments)

	600	Concordia Healthcare Corporation, 144A, (6)		7.000%		4/15/23		C		36,000

		Semiconductors & Semiconductor Equipment – 0.3% (0.2% of Total Investments)

	1,394	Advanced Micro Devices, Inc.		7.500%		8/15/22		B		1,522,945

		Software – 1.7% (1.1% of Total Investments)

	155	Avaya Inc., 144A, (7)		7.000%		4/01/19		N/R		—
	3,830	Avaya Inc., 144A, (7)		10.500%		3/01/21		N/R		—
	3,925	BMC Software Finance Inc., 144A		8.125%		7/15/21		CCC+		3,915,188
	552	Boxer Parent Company Inc./BMC Software, 144A, (cash 9.00%, PIK 9.750%)		9.000%		10/15/19		CCC+		550,620
	3,500	Infor Us Inc., 144A		5.750%		8/15/20		BB		3,565,625
	11,962	Total Software								8,031,433

		Wireless Telecommunication Services – 1.8% (1.1% of Total Investments)

	1,450	Sprint Communications Inc.		7.000%		8/15/20		B+		1,533,375
	6,000	Sprint Corporation		7.875%		9/15/23		B+		6,435,000
	500	Sprint Corporation		7.125%		6/15/24		B+		514,845
	7,950	Total Wireless Telecommunication Services								8,483,220
$	128,374	Total Corporate Bonds (cost $101,349,955)								92,381,321

Shares		Description (1)							Value

		COMMON STOCKS – 2.6% (1.7% of Total Investments)

		Diversified Consumer Services – 0.1% (0.1% of Total Investments)

	71,949	Cengage Learning Holdings II LP, (8)							$	314,777

		Energy Equipment & Services – 0.8% (0.5% of Total Investments)

	60,418	C&J Energy Services Inc., (8)								1,804,081
	58,041	Ocean Rig UDW Inc., Class A, (8)								1,408,075
	2,534	Vantage Drill International, (8)								560,648
		Total Energy Equipment & Services								3,772,804

		Health Care Providers & Services – 0.0% (0.0% of Total Investments)

	54,276	Millenium Health LLC, (8)								1,140


JRO		Nuveen Floating Rate Income Opportunity Fund (continued)
JRO		Portfolio of Investments April 30, 2018
		(Unaudited)


Shares		Description (1)							Value

		Media – 0.5% (0.3% of Total Investments)

	963,320	Hibu PLC, (8), (9)							$	1
	23,363	Metro-Goldwyn-Mayer, (8)								2,266,211
	36,087	Tribune Media Company								5,774
		Total Media								2,271,986

		Oil, Gas & Consumable Fuels – 0.0% (0.0% of Total Investments)

	46	Southcross Holdings Borrower LP, (8)								13,800

		Software – 1.1% (0.7% of Total Investments)

	229,425	Avaya Holdings Corporation, (8)								5,251,538

		Specialty Retail – 0.1% (0.1% of Total Investments)

	8,181	Gymboree Corporation, (7), (8)								130,703
	22,273	Gymboree Corporation, (8)								397,194
		Total Specialty Retail								527,897
		Total Common Stocks (cost $17,795,209)								12,153,942

Principal Amount (000)		Description (1)	Coupon		Maturity		Ratings (4)		Value

		ASSET-BACKED SECURITIES – 0.9% (0.6% of Total Investments)

$	675	Bristol Park CLO Limited, Series 2016-1A, 144A, (3-Month LIBOR reference rate + 7.250% spread), (10)		9.598%		4/15/29		Ba3	$	699,797
	800	Dryden Senior Loan Fund, Series 2017-50A, 144A, (3-Month LIBOR reference rate + 6.260% spread), (10)		8.608%		7/15/30		Ba3		802,267
	750	Gilbert Park CLO LTD, Series 2017-1A, 144A, (3-Month LIBOR reference rate + 6.400% spread), (10)		8.748%		10/15/30		Ba3		759,817
	1,250	Madison Park Funding Limited, Collateralized Loan Obligations, Series 2015-16A, 144A, (3-Month LIBOR reference rate + 5.500% spread), (10)		7.859%		4/20/26		Ba3		1,251,755
	750	OZLM Funding Limited, Series 2012-2A, 144A, (3-Month LIBOR reference rate + 7.300% spread), (10)		9.659%		10/30/27		BB		756,157
$	4,225	Total Asset-Backed Securities (cost $4,115,018)								4,269,793

Shares		Description (1)							Value

		COMMON STOCK RIGHTS – 0.1% (0.1% of Total Investments)

		Oil, Gas & Consumable Fuels – 0.1% (0.1% of Total Investments)

	3,191	Freeport Energy, (8)							$	126,246
	13,369	Freeport Energy, (8)								403,571
		Total Common Stock Rights (cost $423,584)								529,817

Shares		Description (1)							Value

		WARRANTS – 0.0% (0.0% of Total Investments)

		Software – 0.0% (0.0% of Total Investments)

	15,619	Avaya Holdings Corp.							$	85,904
		Total Warrants (cost $1,460,830)								85,904

Principal Amount (000)		Description (1)	Coupon		Maturity		Ratings (4)		Value

		CONVERTIBLE BONDS – 0.0% (0.0% of Total Investments)

		Communications Equipment – 0.0% (0.0% of Total Investments)

$	550	Nortel Networks Limited, (6)		1.750%		4/15/12		N/R	$	16,500
$	550	Total Convertible Bonds (cost $9,033)								16,500
		Total Long-Term Investments (cost $734,348,100)								709,542,420

Shares

Description (1)

Coupon

Value

SHORT-TERM INVESTMENTS – 5.8% (3.6% of Total Investments)

INVESTMENT COMPANIES – 5.8% (3.6% of Total Investments)

26,703,198

BlackRock Liquidity Funds T-Fund Portfolio, (11)

1.562% (12)

26,703,198

Total Short-Term Investments (cost $26,703,198)

26,703,198

Total Investments (cost $761,051,298) – 159.2%

736,245,618

Borrowings – (38.7)% (13), (14)

(178,800,000

)

Term Preferred Shares, net of deferred offering costs – (17.9)% (15)

(82,855,096

)

Other Assets Less Liabilities – (2.6)% (16)

(11,992,975

)

Net Assets Applicable to Common Shares – 100%

462,597,547

Investments in Derivatives

Interest Rate Swaps – OTC Uncleared


Counterparty	Notional Amount		Fund Pay/Receive Floating Rate		Floating Rate Index		Fixed Rate (Annualized)			Fixed Rate Payment Frequency		Maturity Date			Value			Unrealized Appreciation (Depreciation)
Morgan Stanley Capital Services LLC	$	8,000,000		Pay		1-Month LIBOR		2.250	% (17)		Monthly		12/01/23	(18)	$	(147,659	)	$	(147,659	)
Morgan Stanley Capital Services LLC		10,000,000		Pay		1-Month LIBOR		2.500	(19)		Monthly		1/01/22	(20)		(148,476	)		(148,476	)
Morgan Stanley Capital Services LLC		21,000,000		Pay		1-Month LIBOR		2.500	(21)		Monthly		4/01/22	(22)		(331,465	)		(331,465	)
Morgan Stanley Capital Services LLC		45,000,000		Pay		1-Month LIBOR		4.000			Monthly		1/01/27	(23)		(1,444,898	)		(1,444,898	)
Total	$	84,000,000													$	(2,072,498	)	$	(2,072,498	)

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).


JRO		Nuveen Floating Rate Income Opportunity Fund (continued)
JRO		Portfolio of Investments April 30, 2018
		(Unaudited)

The inputs or methodologies used for valuing securities are not an indication of the risk 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:
Variable Rate Senior Loan Interests	$	—	$	600,105,143		$	—		$	600,105,143
Corporate Bonds		—		92,381,321			—	*		92,381,321
Common Stocks		12,023,238		1			130,703			12,153,942
Asset-Backed Securities		—		4,269,793			—			4,269,793
Common Stock Rights		529,817		—			—			529,817
Warrants		85,904		—			—			85,904
Convertible Bonds		—		16,500			—			16,500

Short-Term Investments:
Investment Companies		26,703,198		—			—			26,703,198

Investments in Derivatives:
Interest Rate Swaps**		—		(2,072,498	)		—			(2,072,498	)
Total	$	39,342,157	$	694,700,260		$	130,703		$	734,173,120

*	Value equals zero as of the end of the reporting period.

**	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 the treatment of timing differences in recognizing certain gains and losses on investment transactions and recognition of premium amortization. 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.

The tables below present the cost and unrealized appreciation (depreciation) of the Fund’s investment portfolio, as determined on a federal income tax basis, as of April 30, 2018.

For purposes of this disclosure, derivative tax cost is generally the sum of any upfront fees or premiums exchanged and any amounts unrealized for income statement reporting but realized in income and/or capital gains for tax reporting. If a particular derivative category does not disclose any tax unrealized appreciation or depreciation, the change in value of those derivatives have generally been fully realized for tax purposes.


Tax cost of investments	$	768,111,403
Gross unrealized:
Appreciation	$	12,368,931
Depreciation		(44,234,716	)
Net unrealized appreciation (depreciation) of investments	$	(31,865,785	)

Tax cost of swaps	$	—
Net unrealized appreciation (depreciation) of swaps		(2,072,498	)

For Fund portfolio compliance purposes, the Fund’s industry classifications refer to any one or more of the industry sub-classifications used by one or more widely recognized market indexes or ratings group indexes, and/or as defined by Fund management. This definition may not apply for purposes of this report, which may combine industry sub-classifications into sectors for reporting ease.

(1)	All percentages shown in the Portfolio of Investments are based on net assets applicable to common shares unless otherwise noted.

(2)

Senior loans generally pay interest at rates which are periodically adjusted by reference to a base short-term, floating lending rate (Reference Rate) plus an assigned fixed rate (Spread). These floating lending rates are generally (i) the lending rate referenced by the London Inter-Bank Offered Rate (“LIBOR”), or (ii) the prime rate offered by one or more major United States banks. Senior loans may be considered restricted in that the Fund ordinarily is contractually obligated to receive approval from the agent bank and/or borrower prior to the disposition of a senior loan. The rate shown is the coupon as of the end of the reporting period.

(3)

Senior loans generally are subject to mandatory and/or optional prepayment. Because of these mandatory prepayment conditions and because there may be significant economic incentives for a borrower to prepay, prepayments of senior loans may occur. As a result, the actual remaining maturity of senior loans held may be substantially less than the stated maturities shown.

(4)

For financial reporting purposes, the ratings disclosed are the highest of Standard & Poor’s Group (“Standard & Poor’s”), Moody’s Investors Service, Inc. (“Moody’s”) or Fitch, Inc. (“Fitch”) rating. This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. 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.

(5)	Investment, or portion of investment, represents an outstanding unfunded senior loan commitment.

(6)

As of, or subsequent to, the end of the reporting period, this security is non-income producing. Non-income producing, in the case of a fixed-income security, generally denotes that the issuer has (1) defaulted on the payment of principal or interest, (2) is under the protection of the Federal Bankruptcy Court or (3) the Fund’s Adviser has concluded that the issue is not likely to meet its future interest payment obligations and has ceased accruing additional income on the Fund’s records.

(7)	Investment valued at fair value using methods determined in good faith by, or at the discretion of, the Board. For fair value measurement disclosure purposes, investment classified as Level 3.

(8)	Non-income producing; issuer has not declared a dividend within the past twelve months.

(9)	For fair value measurement disclosure purposes, investment classified as Level 2.

(10)	Variable rate security. The rate shown is the coupon as of the end of the reporting end.

(11)	A copy of the most recent financial statements for these investment companies can be obtained directly from the Securities and Exchange Commission on its website at the http://www.sec.gov.

(12)	The rate shown is the annualized seven-day subsidized yield as of the end of the reporting period.

(13)	Borrowings as a percentage of Total Investments is 24.3%.

(14)	The Fund segregates 100% of its eligible investments (excluding any investments separately pledged as collateral for specific investments in derivatives, when applicable) in the Portfolio of Investments as collateral for borrowings.

(15)	Term Preferred Shares, net of deferred offering costs as a percentage of Total Investments is 11.3%.

(16)	Other assets less liabilities includes the unrealized appreciation (depreciation) of certain over-the-counter (“OTC”) derivatives as well as the OTC cleared and exchange-traded derivatives, when applicable.

(17)	Effective December 1, 2018, the fixed rate paid by the Fund will increase according to a predetermined schedule as specified in the swap contract. Additionally, this fixed rate increase will continue to occur every two years on specific dates through the swap contract’s termination date.

(18)	This interest rate swap has an optional early termination date beginning on December 1, 2018 and monthly thereafter through the termination date as specified in the swap contract.

(19)	Effective January 1, 2020, the fixed rate paid by the Fund will increase according to a predetermined schedule as specified in the swap contract. Additionally, this fixed rate increase will continue to occur every twelve months on specific dates through the swap contract’s termination date.

(20)	This interest rate swap has an optional early date beginning on January 1, 2019 and monthly thereafter through the termination date as specified in the swap contract.

(21)	Effective April 1, 2020, the fixed rate paid by the Fund will increase according to a predetermined schedule as specified in the swap contract. Additionally, this fixed rate increase will continue to occur every twelve months on specific dates through the swap contract’s termination date.

(22)	This interest rate swap has an optional early termination date beginning on July 1, 2019 and monthly thereafter through the termination date as specified in the swap contract.

(23)	This interest rate swap has an optional early termination date beginning on January 1, 2021 and monthly thereafter through the termination date as specified in the swap contract.

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.

DD1	Portion of investment purchased on a delayed delivery basis.

LIBOR

London Inter-Bank Offered Rate

N/A	Not applicable

PIK

Payment-in-kind (“PIK”) security. Depending on the terms of the security, income may be received in the form of cash, securities, or a combination of both. The PIK rate shown, where applicable, represents the annualized rate of the last PIK payment made by the issuer as of the end of the reporting period.

TBD

Senior loan purchased on a when-issued or delayed-delivery basis. Certain details associated with this purchase are not known prior to the settlement date of the transaction. In addition, senior loans typically trade without accrued interest and therefore a coupon rate is not available prior to settlement. At settlement, if still unknown, the borrower or counterparty will provide the Fund with the final coupon rate and maturity date.

WI/DD

Purchased on a when-issued or delayed delivery basis.

Item 2. Controls and Procedures.

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)).

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: 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 Floating Rate Income Opportunity Fund

By (Signature and Title)		/s/ Gifford R. Zimmerman
		Gifford R. Zimmerman
		Vice President and Secretary

Date: June 29, 2018

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/ Cedric H. Antosiewicz
		Cedric H. Antosiewicz
		Chief Administrative Officer (principal executive officer)

Date: June 29, 2018

By (Signature and Title)		/s/ Stephen D. Foy
		Stephen D. Foy
		Vice President and Controller (principal financial officer)

Date: June 29, 2018