UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES

Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR 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 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. SS. 3507.

Closed-End Funds

Nuveen Investments

Closed-End Funds

Semi-Annual Report January 31, 2015

NSL

Nuveen Senior Income Fund

JFR

Nuveen Floating Rate Income Fund

JRO

Nuveen Floating Rate Income Opportunity Fund

JSD

Nuveen Short Duration Credit Opportunities Fund

JQC

Nuveen Credit Strategies Income Fund

NUVEEN INVESTMENTS ACQUIRED BY TIAA-CREF

On October 1, 2014, TIAA-CREF completed its previously announced acquisition of Nuveen Investments, Inc., the parent company of your fund's investment adviser, Nuveen Fund Advisors, LLC ("NFAL") and the Nuveen affiliates that act as sub-advisers to the majority of the Nuveen Funds. TIAA-CREF is a national financial services organization with approximately $851 billion in assets under management as of December 31, 2014 and is a leading provider of retirement services in the academic, research, medical and cultural fields. Nuveen is operating as a separate subsidiary within TIAA-CREF's asset management business.

Table

of Contents

Chairman's Letter

to Shareholders

Dear Shareholders,

A pattern of divergence has emerged in the past year. Steady and moderate growth in the U.S. economy helped sustain the stock market's bull run another year. U.S. bonds also performed well, amid subdued inflation, interest rates that remained unexpectedly low and concerns about the economic well-being of the rest of the world. The stronger domestic economy enabled the U.S. Federal Reserve (Fed) to gradually reduce its large scale bond purchases, known as quantitative easing (QE), without disruption to the markets, as well as begin to set expectations for a transition into tightening mode.

The story outside the U.S., however, was different. European growth was stagnating and Japan fell into a recession, contributing to the bouts of volatility in their markets. China's economy decelerated and, despite running well above the rate of other major global economies, investors feared it looked slow by China's standards. Compounding these concerns were a surprisingly steep decline in oil prices, the U.S. dollar's rally and an increase in geopolitical tensions, including the Russia-Ukraine crisis and terrorist attacks across the Middle East and Africa, as well as more recently in Europe.

While a backdrop of healthy economic growth in the U.S. and the continuation of accommodative monetary policy (with the central banks of Japan and potentially Europe stepping in where the Fed has left off) bodes well for the markets, the global outlook has become more uncertain. Indeed, volatility is likely to feature more prominently in the investment landscape going forward. Such conditions underscore the importance of professional investment management. Experienced investment teams have weathered the market's ups and downs in the past and emerged with a better understanding of the sensitivities of their asset class and investment style, particularly in times of turbulence. We recognize the importance of maximizing gains, while striving to minimize volatility.

And, the same is true for investors like you. Maintaining an appropriate time horizon, diversification and relying on practiced investment teams are among your best strategies for achieving your long-term investment objectives. Additionally, I encourage you to communicate with your financial consultant if you have questions about your investment in a Nuveen Fund. On behalf of the other members of the Nuveen Fund Board, we look forward to continuing to earn your trust in the months and years ahead.

William J. Schneider
Chairman of the Board
March 26, 2015

Portfolio Managers'

Comments

Nuveen Senior Income Fund (NSL)

Nuveen Floating Rate Income Fund (JFR)

Nuveen Floating Rate Income Opportunity Fund (JRO)

Nuveen Short Duration Credit Opportunities Fund (JSD)

Nuveen Credit Strategies Income Fund (JQC)

The Funds' investment portfolios are managed by Symphony Asset Management, LLC (Symphony), an affiliate of Nuveen Investments, Inc. Gunther Stein, who serves as the firm's Chief Investment Officer, and Scott Caraher manage NSL, JFR and JRO. Gunther and Sutanto Widjaja manage JQC, while JSD is managed by Gunther, Scott and Jenny Rhee. Here the team discusses their management strategies and the performance of the Funds for the six-month reporting period ended January 31, 2015.

What strategies were used to manage the Funds during the six-month reporting period ended January 31, 2015?

NSL, JFR and JRO have similar investment objectives and strategies. Each Fund is designed to seek a high level of current income by primarily investing in a portfolio of adjustable rate, senior secured corporate loans. The Funds also may invest in unsecured senior loans, other debt securities, equity securities and warrants acquired in connection with an investment in senior loans. A significant portion of each Fund's assets may be invested in instruments that, at the time of investment, are rated below investment grade or are unrated but judged by Symphony to be of comparable quality.

JSD seeks to provide current income and the potential for capital appreciation. The Fund invests primarily in a blended portfolio of below investment grade adjustable rate corporate debt instruments, including senior secured loans, second lien loans and other adjustable rate corporate debt instruments. The Fund may also make limited tactical investments in other types of debt instruments and may enter into tactical short positions consisting of primarily high yield debt. Under normal market conditions the Fund maintains a portfolio with an average duration that does not exceed two years.

JQC invests at least 70% of its assets in senior secured and second lien loans, and up to 30% of its assets opportunistically over the credit cycle in other types of securities across a company's capital structures. These other securities primarily include income-oriented securities such as high yield corporate and convertible bonds as well as common stocks. The Fund maintained exposure to senior loans during the reporting period, while tactically allocating between high yield corporate bonds, equity securities and convertible bonds. Exposure consisted of mainly U.S. issuers, and was focused on companies that, in general, had high levels of tangible assets, predictable revenue streams, significant market share within their respective industries and positive free cash flow.

Certain statements in this report are forward-looking statements. Discussions of specific investments are for illustration only and are not intended as recommendations of individual investments. The forward-looking statements and other views expressed herein are those of the portfolio managers as of the date of this report. Actual future results or occurrences may differ significantly from those anticipated in any forward-looking statements and the views expressed herein are subject to change at any time, due to numerous market and other factors. The Funds disclaim any obligation to update publicly or revise any forward-looking statements or views expressed herein.

Ratings shown are the highest rating given by one of the following national rating agencies: Standard & Poor's (S&P), Moody's Investors Service, Inc. (Moody's) or Fitch, Inc. (Fitch). Credit ratings are subject to change. AAA, AA, A and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below investment grade ratings. Certain bonds backed by U.S. Government or agency securities are regarded as having an implied rating equal to the rating of such securities. Holdings designated N/R are not rated by these national rating agencies.

Refer to the Glossary of Terms Used in this Report for further definition of the terms used within this section.

Portfolio Managers' Comments (continued)

During the six-month reporting period, assets across the high yield and bank loan markets posted negative returns as heightened volatility plagued credit markets on weakened investor sentiment and rising risk aversion. The volatility experienced by most market participants was driven in most part by a dramatic drop in commodity prices, primarily oil. In addition, a contrast materialized between the pace of economic growth domestically in the U.S. and that of both developed and developing countries around the globe. While the U.S. appears to be experiencing improving economic conditions, the rest of the world appears to be struggling with how to spur similar growth. The dramatic drop in oil, along with interest rate expectations globally, has also broadly dampened inflationary concerns.

Across credit markets, volatility remained elevated during the reporting period. At the top of the capital structure, loan markets held in nicely for the reporting period relative to high yield. Throughout the reporting period, the loan market was defined by continued retail mutual fund outflows being largely offset by supportive institutional demand; predominantly collateralized loan obligations (CLO) issuance. The loan market experienced increased volatility, driven largely by fourth quarter weakness, and finished with a vast majority of the loan market priced below par. In addition, while energy is only a fractional representation of the loan market, weakness in the sector seemingly re-priced risk across all credit assets as well as increased default concerns in the energy sector. Default activity on a dollar amount basis increased during the reporting period primarily due to the default within the public gaming industry for Caesars Entertainment Operating Company, Inc. on $5.5 billion in loans. We did not own any of these holdings. In total for the reporting period, seven loans defaulted on a total of $8.7 billion. The default rate increased to 1.70%, excluding TXU bankruptcy that occurred in April 2014, which was generally anticipated by the market. Including TXU bankruptcy, the rate was 4.5% which did increase that rate above the 15-year historical average of 3.5%.

The high yield corporate bond market was impacted as global growth concerns started gaining traction, oil prices began what became a tumultuous slide and credit markets began to discern the creditworthiness of many issuers, mainly energy related names. The energy sector, dominated by offshore drilling and exploration/production companies, started the year representing nearly one-fifth of the high yield market. As oil prices slid heavily throughout the second half of the reporting period, much of the positive gains the high yield market experienced up until that point in the year had been erased.

Lastly, within the convertible bond markets returns were rather solid for the reporting period. The convertible market gave back much of the gains achieved in the first six months of the year as equities retreated, credit markets sold off and convertible valuations cheapened. Interestingly, late in the fourth quarter convertibles rebounded and recovered much of the losses in the first part of the quarter and finished the reporting period ahead of both the high yield and the bank loan markets.

How did the Funds perform during this six-month reporting period ended January 31, 2015?

The tables in the Performance Overview and Holding Summaries section of this report provide total return performance for each Fund for the six-month, one-year, five-year, ten-year and/or since inception periods ended January 31, 2015. For the six-month reporting period ended January 31, 2015, NSL, JFR, JRO and JSD total return on common share net asset value (NAV) underperformed the Barclays U.S. Aggregate Bond Index, while JQC outperformed the CSFB Leveraged Loan Index.

For NSL, JFR, JRO and JSD loans in the information technology, health care and food and drug sectors contributed to performance. However, these could not offset our loans in the energy sector, which contributed to the Funds underperformance versus its benchmark. Also contributing to the Funds underperformance was a holding in the media & telecom sector. For JSD, a short bond position positively contributed to performance.

The loans within technology hardware and services company Dell International helped boost returns for the reporting period. The loan is a BBB-rated issue of a corporation that performed well and continues to generate strong free cash flow. We also believe the borrower has a strong credit profile with an attractive coupon relative to other BBB-rated names

in the sector and has outperformed during volatile market environments. We continue to maintain this position as a core holding as it provides a more defensive exposure to the asset class.

In the food and staples retailing sector, the loans of food retailer Albertsons also benefited performance. In our opinion, this sector has historically been more defensive during periods of volatility. We believe this loan offers an attractive coupon relative to the rest of the sector and broad market. Both the sector and the company have performed well during the reporting period. We anticipate the loan will continue to be a core position in our portfolios in the near term.

In addition, Drumm Investors LLC, (Golden Living), which specializes in health care for seniors, benefited performance as the firm completed amendments to their loans and continue to offer healthy yields.

Energy holdings, while only a modest representation, which was approximately 4%, of the overall markets, were the key detractors for the reporting period. While we began reducing our exposure to the sector ahead of the steep decline in oil prices, we continued to maintain modest exposures, of approximately 2%, that detracted from overall performance. Specifically, the loan of Fieldwood Energy, LLC, Drill Rigs Holdings, Inc., Energy & Exploration Partners and Seadrill Partners, LLC. weighed on performance during the reporting period.

Also detracting from performance were the bonds of Clear Channel Communications, Inc., a diversified media and entertainment company. The bonds were impacted as riskier assets experienced a sell-off during the second half of the reporting period.

For JSD, we also continued to invest in credit default swaps, which were used to provide a benefit if particular bonds' credit quality worsened. The Fund does not hold other securities issued by the issuers referenced under these credit default swap contracts. These contracts had a positive effect on performance.

For JQC, overall the Fund continued to benefit from the strong performance of risk assets during the reporting period. From an asset class standpoint, senior loans and equity holdings modestly contributed to portfolio returns. Our high yield bond holdings detracted from performance. In the food and staples retailing sector, the loans of food retailer Albertsons, Inc. benefited performance. In our opinion, this sector has historically been more defensive during periods of volatility. We believe this loan offers an attractive coupon relative to the rest of the sector and broad market. Both the sector and the company have performed well during the reporting period. We anticipate the loan will continue to be a core position in our portfolios in the near term. In addition, Drumm Investors LLC, (Golden Living), which specializes in health care for seniors, benefited performance as the firm completed amendments to their loans and continue to offer healthy yields. Energy holdings, while only a modest representation of the overall markets and the Fund's portfolio, were the key detractors for the reporting period. While we began reducing our exposure to the sector ahead of the steep decline in oil prices, we continued to maintain modest exposures that detracted from overall performance. Specifically, the term loans of Fieldwood Energy, LLC, and Offshore Group Investment Limited weighed on performance during the reporting period. Lastly, Cengage Learning Acquisitions, Inc. reorg equity detracted from performance. The equity continued to trade down after reporting disappointing third quarter results. Cengage went into chapter 11 and as part of its reorganization plan reached with creditors, we received a portion of the reorganized equity of the firm. We believe the company, which has significant market share in this consolidated industry, will improve its balance sheet and there will be value distributed to the lenders.

There has been an increased focus on the structure of many senior loans in the market, including LIBOR floors. These are fairly recent developments and worthy of discussion. All of these Funds have owned, or currently own, loans with the LIBOR floor feature. The coupon on most senior loans consists of both LIBOR (usually 90-day U.S. LIBOR) plus a spread. For example, a senior loan might have a coupon structure of "LIBOR plus 400 basis points (bp)" in which the coupon consists of 90-day LIBOR, plus 400bp. Given today's relatively low LIBOR rate, however, many issuers have put in place LIBOR floors to enhance the yield (and satisfy demand from investors) for newly issued loans. LIBOR floors, as the name suggests, put a "floor" on the reference LIBOR rate. LIBOR floors typically range from 150bp to 50bp. A loan with a

Portfolio Managers' Comments (continued)

LIBOR floor might have a structure of "LIBOR + 400bp with a 100bp LIBOR floor." In this example, the effective coupon is 5% (100bp + 400bp). As a result, as LIBOR rises from current levels, the yield on a senior loan with a LIBOR floor will not rise in lockstep until after the reference LIBOR rate exceeds the LIBOR floor. Although many loans have LIBOR floors, the asset class is one of the few that will float when interest rates begin to rise, we believe the senior loan asset class provides fixed income oriented investors with a potential safeguard from a secular rise in interest rates.

Fund

Leverage

IMPACT OF THE FUNDS' LEVERAGE STRATEGY ON PERFORMANCE

One important factor impacting the returns of the Funds relative to their benchmarks was the Funds' use of leverage through the use of bank borrowings and for NSL, JFR and JRO, Variable Rate Term Preferred (VRTP) Shares. The Funds use leverage because our research has shown that, over time, leveraging provides opportunities for additional income and total return for common shareholders. However, use of leverage also can expose common shareholders to additional volatility. For example, as the prices of securities held by a Fund decline, the negative impact of these valuation changes on common share NAV and common shareholder total return is magnified by the use of leverage. Conversely, leverage may enhance common share returns during periods when the prices of securities held by a Fund generally are rising. The Funds' use of leverage had a slightly negative impact on performance during this reporting period.

The Funds also used interest rate swap contracts to partially fix the interest cost of leverage, which as mentioned previously, is through bank borrowings and or VRTP Shares. During the reporting period, NSL, JFR, JRO and JQC unwound their respective swap contracts. JSD began the reporting period with three swap contracts, one of which matured and another was unwound prior to the end of the reporting period. The swap contracts held by NSL, JFR, JRO and JQC had an overall negligible impact on Fund performance, while JSD's swap contracts detracted modestly from overall Fund performance.

As of January 31, 2015, the Funds' percentages of leverage are shown in the accompanying table.

*  Effective leverage is a Fund's effective economic leverage, and includes both regulatory leverage and the leverage effects of certain derivative and other investments in a Fund's portfolio that increase the Fund's investment exposure. Regulatory leverage consists of preferred shares issued or borrowings of a Fund. Both of these are part of a Fund's capital structure. Regulatory leverage is subject to asset coverage limits set forth in the Investment Company Act of 1940.

THE FUNDS' REGULATORY LEVERAGE

Bank Borrowings

The Funds employ regulatory leverage through the use of bank borrowings. As of January 31, 2015, the Funds outstanding bank borrowings are as shown in the accompanying table.

Refer to Notes to Financial Statements, Note 9—Borrowing Arrangements for further details.

Variable Rate Term Preferred Shares

In addition to bank borrowings, NSL, JFR and JRO also issued VRTP Shares. As of January 31, 2015, the Funds' outstanding VRTP Shares are as shown in the accompanying table.

Refer to Notes to Financial Statements, Note 1—General Information and Significant Accounting Policies for further details on VRTP Shares.

Common Share

Information

DISTRIBUTION INFORMATION

The following information regarding the Funds' distributions is current as of January 31, 2015. Each Fund's distribution levels may vary over time based on each Fund's investment activities and portfolio investment value changes.

During the current reporting period, each Fund's distributions to common shareholders were as shown in the accompanying table.

*  Distribution paid in December 2014.

**  Current distribution rate is based on the Fund's current annualized monthly distribution divided by the Fund's current market price. The Fund's monthly distributions to its shareholders may be comprised of ordinary income, net realized capital gains and, if at the end of the fiscal year the Fund's cumulative net ordinary income and net realized gains are less than the amount of the Fund's distributions, a return of capital for tax purposes.

Each Fund in this report seeks to pay regular monthly dividends out of its net investment income at a rate that reflects its past and projected net income performance. To permit each Fund to maintain a more stable monthly dividend, the Fund may pay dividends at a rate that may be more or less than the amount of net income actually earned by the Fund during the period. If a Fund has cumulatively earned more than it has paid in dividends, it will hold the excess in reserve as undistributed net investment income (UNII) as part of the Fund's net asset value. Conversely, if a Fund has cumulatively paid in dividends more than it has earned, the excess will constitute a negative UNII that will likewise be reflected in the Fund's net asset value. Each Fund will, over time, pay all its net investment income as dividends to shareholders.

As of January 31, 2015, all the Funds in this report had positive UNII balances, based upon our best estimate, for tax purposes. All of the Funds in this report had negative UNII balances for financial reporting purposes.

All monthly dividends paid by each Fund during the six months ended January 31, 2015, were paid from net investment income. If a portion of the Fund's monthly distributions was sourced from or comprised of elements other than net investment income, including capital gains and/or a return of capital, shareholders would have received a notice to that effect. For financial reporting purposes, the composition and per share amounts of each Fund's dividends for the reporting period are presented in this report's Statement of Changes in Net Assets and Financial Highlights, respectively. For income tax purposes, distribution information for each Fund as of its most recent tax year end is presented in Note 6 — Income Tax Information within the Notes to Financial Statements of this report.

COMMON SHARE REPURCHASES

During August 2014, the Funds' Board of Trustees reauthorized an open-market share repurchase program, allowing each Fund to repurchase an aggregate of up to approximately 10% of its outstanding shares.

As of January 31, 2015, and since the inception of the Funds' repurchase programs, the Funds have cumulatively repurchased and retired their common shares as shown in the accompanying table.

During the current reporting period, the Funds repurchased and retired common shares at a weighted average price per share and a weighted average discount per common share as shown in the accompanying table.

COMMON SHARE EQUITY SHELF PROGRAMS

During the reporting period, the following Funds were authorized to issue additional shares through their ongoing equity shelf programs. Under these programs, each Fund, subject to market conditions, may raise additional capital from time to time in varying amounts and offering methods at a net price or above the Fund's NAV per common share. Under the equity shelf programs, the Funds are authorized to issue the following number of additional common shares:

During the current reporting period, the Funds did not sell any common shares through their equity shelf programs.

As of November 30, 2014, the Funds' shelf offering registration statement are no longer effective. Therefore, the Funds may not issue additional common shares under their equity shelf programs until a new registration statement is effective.

OTHER COMMON SHARE INFORMATION

As of January 31, 2015, and during the current reporting period, the Funds' common share prices were trading at a premium/(discount) to their common share NAVs as shown in the accompanying table.

Risk

Considerations

Fund shares are not guaranteed or endorsed by any bank or other insured depository institution, and are not federally insured by the Federal Deposit Insurance Corporation. Shares of closed-end funds are subject to investment risks, including the possible loss of principal invested. Past performance is no guarantee of future results. Fund common shares are subject to a variety of risks, including:

Investment, Market and Price Risk. An investment in common shares is subject to investment risk, including the possible loss of the entire principal amount that you invest. Your investment in common shares represents an indirect investment in the corporate securities owned by the Funds, which generally trade in the over-the-counter markets. Shares of closed-end investment companies like the Funds frequently trade at a discount to their NAV. Your common shares at any point in time may be worth less than your original investment, even after taking into account the reinvestment of Fund dividends and distributions.

Leverage Risk. The Funds' use of leverage creates the possibility of higher volatility for the Funds' per share NAV, market price and distributions. Leverage risk can be introduced through regulatory leverage (issuing preferred shares or debt borrowings at the Fund level) or through certain derivative investments held in a Fund's portfolio. Leverage typically magnifies the total return of a Fund's portfolio, whether that return is positive or negative. The use of leverage creates an opportunity for increased common share net income, but there is no assurance that a Fund's leveraging strategy will be successful.

Tax Risk. The tax treatment of Fund distributions may be affected by new IRS interpretations of the Internal Revenue Code and future changes in tax laws and regulations.

Issuer Credit Risk. This is the risk that a security in a Fund's portfolio will fail to make dividend or interest payments when due.

Illiquid Securities Risk. This is the risk that a Fund may not be able to sell securities in its portfolio at the time or price desired by the Fund.

Preferred Stock Risk. Preferred stocks are subordinated to bonds and other debt instruments in a company's capital structure, and therefore are subject to greater credit risk.

Call Risk or Prepayment Risk. Issuers may exercise their option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower-yielding securities.

Counterparty Risk. To the extent that a Fund's derivative investments are purchased or sold in over-the-counter transactions, the Fund will be exposed to the risk that counter-parties to these transactions will be unable to meet their obligations.

Non-Investment Grade or Below-Investment Grade Risk. Investments in securities below investment grade quality are predominantly speculative and subject to greater volatility and risk of default.

Non-U.S. Securities Risk. Investments in non-U.S securities involve special risks not typically associated with domestic investments including currency risk and adverse political, social and economic development. These risks often are magnified in emerging markets.

Unrated Investment Risk. In determining whether an unrated security is an appropriate investment for a Fund, the manager will consider information from industry sources, as well as its own quantitative and qualitative analysis, in making such a determination. However, such a determination by the manager is not the equivalent of a rating by a rating agency.

Interest Rate Swaps Risk. The risk that yields will move in the direction opposite to the direction anticipated by a Fund, which would cause a Fund to make payments to its counterparty in the transaction that could adversely affect the Fund's performance.

Senior Loan Risk. Senior loans, both secured and unsecured, may not be rated by a national rating agency at the time of investment, generally will not be registered with the Securities and Exchange Commission (SEC) and generally will not be listed on a securities exchange. In addition, the amount of public information available with respect to senior loans generally is less extensive than that available for more widely rated, registered and exchange-listed securities.

Risks from Unsecured Adjustable Rate Loans or Insufficient Collateral Securing Adjustable Rate Loans. Some of the adjustable rate loans in which a Fund may invest will be unsecured, thereby increasing the risk of loss to the Fund in the event of issuer default. Other adjustable rate loans may be secured by specific collateral, but there can be no assurance that liquidating this collateral would satisfy a borrower's obligation to the Fund in the event of borrower default, or that such collateral could be readily liquidated under such circumstances.

Derivatives Strategy Risk. Derivative securities, such as calls, puts, warrants, swaps and forwards, carry risks different from, and possibly greater than, the risks associated with the underlying investments.

Interest Rate Risk. Fixed-income securities such as bonds, preferred, convertible and other debt securities will decline in value if market interest rates rise.

Reinvestment Risk. If market interest rates decline, income earned from a Fund's portfolio may be reinvested at rates below that of the original investment that generated the income.

NSL

Nuveen Senior Income Fund

Performance Overview and Holding Summaries as of January 31, 2015

Refer to Glossary of Terms Used in this Report for further definition of the terms used within this section.

Average Annual Total Returns as of January 31, 2015

Past performance is not predictive of future results. Current performance may be higher or lower than the data shown. Returns do not reflect the deduction of taxes that shareholders may have to pay on Fund distributions or upon the sale of Fund shares. Returns at NAV are net of Fund expenses and assume reinvestment of distributions. Comparative index return information is provided for the Fund's shares at NAV only. Indexes are not available for direct investment.

Common Share Price Performance — Weekly Closing Price

This data relates to the securities held in the Fund's portfolio of investments as of the end of the reporting period. It should not be construed as a measure of performance for the Fund itself. Holdings are subject to change.

Ratings shown are the highest rating given by one of the following national rating agencies: Standard & Poor's Group, Moody's Investors Service, Inc. or Fitch, Inc. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Certain bonds backed by U.S. Government or agency securities are regarded as having an implied rating equal to the rating of such securities. Holdings designated N/R are not rated by these national rating agencies.

Fund Allocation

(% of net assets)

Top Five Issuers

(% of total long-term investments)

Portfolio Composition

(% of total investments)

Credit Quality

(% of total long-term fixed income investments)

JFR

Nuveen Floating Rate Income Fund

Performance Overview and Holding Summaries as of January 31, 2015

Refer to Glossary of Terms Used in this Report for further definition of the terms used within this section.

Average Annual Total Returns as of January 31, 2015

Past performance is not predictive of future results. Current performance may be higher or lower than the data shown. Returns do not reflect the deduction of taxes that shareholders may have to pay on Fund distributions or upon the sale of Fund shares. Returns at NAV are net of Fund expenses and assume reinvestment of distributions. Comparative index return information is provided for the Fund's shares at NAV only. Indexes are not available for direct investment.

Common Share Price Performance — Weekly Closing Price

This data relates to the securities held in the Fund's portfolio of investments as of the end of the reporting period. It should not be construed as a measure of performance for the Fund itself. Holdings are subject to change.

Ratings shown are the highest rating given by one of the following national rating agencies: Standard & Poor's Group, Moody's Investors Service, Inc. or Fitch, Inc. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Certain bonds backed by U.S. Government or agency securities are regarded as having an implied rating equal to the rating of such securities. Holdings designated N/R are not rated by these national rating agencies.

Fund Allocation

(% of net assets)

Top Five Issuers

(% of total long-term investments)

Portfolio Composition

(% of total investments)

Credit Quality

(% of total long-term fixed income investments)

JRO

Nuveen Floating Rate Income Opportunity Fund

Performance Overview and Holding Summaries as of January 31, 2015

Refer to Glossary of Terms Used in this Report for further definition of the terms used within this section.

Average Annual Total Returns as of January 31, 2015

Past performance is not predictive of future results. Current performance may be higher or lower than the data shown. Returns do not reflect the deduction of taxes that shareholders may have to pay on Fund distributions or upon the sale of Fund shares. Returns at NAV are net of Fund expenses and assume reinvestment of distributions. Comparative index return information is provided for the Fund's shares at NAV only. Indexes are not available for direct investment.

Common Share Price Performance — Weekly Closing Price

This data relates to the securities held in the Fund's portfolio of investments as of the end of the reporting period. It should not be construed as a measure of performance for the Fund itself. Holdings are subject to change.

Ratings shown are the highest rating given by one of the following national rating agencies: Standard & Poor's Group, Moody's Investors Service, Inc. or Fitch, Inc. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Certain bonds backed by U.S. Government or agency securities are regarded as having an implied rating equal to the rating of such securities. Holdings designated N/R are not rated by these national rating agencies.

Fund Allocation

(% of net assets)

Top Five Issuers

(% of total long-term investments)

Portfolio Composition

(% of total investments)

Credit Quality

(% of total long-term fixed income investments)

JSD

Nuveen Short Duration Credit Opportunities Fund

Performance Overview and Holding Summaries as of January 31, 2015

Refer to Glossary of Terms Used in this Report for further definition of the terms used within this section.

Average Annual Total Returns as of January 31, 2015

Past performance is not predictive of future results. Current performance may be higher or lower than the data shown. Returns do not reflect the deduction of taxes that shareholders may have to pay on Fund distributions or upon the sale of Fund shares. Returns at NAV are net of Fund expenses and assume reinvestment of distributions. Comparative index return information is provided for the Fund's shares at NAV only. Indexes are not available for direct investment.

Common Share Price Performance — Weekly Closing Price

This data relates to the securities held in the Fund's portfolio of investments as of the end of the reporting period. It should not be construed as a measure of performance for the Fund itself. Holdings are subject to change.

Ratings shown are the highest rating given by one of the following national rating agencies: Standard & Poor's Group, Moody's Investors Service, Inc. or Fitch, Inc. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Certain bonds backed by U.S. Government or agency securities are regarded as having an implied rating equal to the rating of such securities. Holdings designated N/R are not rated by these national rating agencies.

Fund Allocation

(% of net assets)

Top Five Issuers

(% of total long-term investments)²

Portfolio Composition

(% of total investments)²

Credit Quality

(% of total long-term fixed income investments)

1  Since inception returns are from 5/25/11.

2  Excluding investments in derivatives.

JQC

Nuveen Credit Strategies Income Fund

Performance Overview and Holding Summaries as of January 31, 2015

Refer to Glossary of Terms Used in this Report for further definition of the terms used within this section.

Average Annual Total Returns as of January 31, 2015

Past performance is not predictive of future results. Current performance may be higher or lower than the data shown. Returns do not reflect the deduction of taxes that shareholders may have to pay on Fund distributions or upon the sale of Fund shares. Returns at NAV are net of Fund expenses and assume reinvestment of distributions. Comparative index return information is provided for the Fund's shares at NAV only. Indexes are not available for direct investment.

Common Share Price Performance — Weekly Closing Price

This data relates to the securities held in the Fund's portfolio of investments as of the end of the reporting period. It should not be construed as a measure of performance for the Fund itself. Holdings are subject to change.

Ratings shown are the highest rating given by one of the following national rating agencies: Standard & Poor's Group, Moody's Investors Service, Inc. or Fitch, Inc. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Certain bonds backed by U.S. Government or agency securities are regarded as having an implied rating equal to the rating of such securities. Holdings designated N/R are not rated by these national rating agencies.

Fund Allocation

(% of net assets)

Top Five Issuers

(% of total long-term investments)

Portfolio Composition

(% of total investments)

Credit Quality

(% of total long-term fixed income investments)

Shareholder

Meeting Report

A special meeting of shareholders was held in the offices of Nuveen Investments on August 5, 2014 for NSL, JFR, JRO, JSD and JQC; at this meeting the shareholders were asked to vote to approve a new investment management agreement, to approve a new sub-advisory agreement and to elect Board Members.

NSL

Nuveen Senior Income Fund

Portfolio of Investments  January 31, 2015 (Unaudited)

NSL  Nuveen Senior Income Fund
Portfolio of Investments (continued)  January 31, 2015 (Unaudited)