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INDEX TO FINANCIAL STATEMENTS
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INDEX TO FINANCIAL STATEMENTS

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Filed Pursuant to Rule 497
Securities Act File No. 333-218040

This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but the information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell and are not soliciting an offer to buy these securities in any jurisdiction where the offer and sale is not permitted.

Subject to Completion, Dated September 20, 2018

PRELIMINARY PROSPECTUS SUPPLEMENT
(to Prospectus dated July 13, 2018)

$                            

New Mountain Finance Corporation

         % Notes due 2023

New Mountain Finance Corporation ("NMFC", the "Company", "we", "us" and "our") is a Delaware corporation that was originally incorporated on June 29, 2010. We are a closed-end, non-diversified management investment company that has elected to be regulated as a business development company under the Investment Company Act of 1940, as amended (the "1940 Act"). Our investment objective is to generate current income and capital appreciation through the sourcing and origination of debt securities at all levels of the capital structure, including first and second lien debt, notes, bonds and mezzanine securities. Our first lien debt may include traditional first lien senior secured loans or unitranche loans. Unitranche loans combine characteristics of traditional first lien senior secured loans as well as second lien and subordinated loans. Unitranche loans will expose us to the risks associated with second lien and subordinated loans to the extent we invest in the "last out" tranche. In some cases, our investments may also include equity interests. Our primary focus is in the debt of defensive growth companies, which are defined as generally exhibiting the following characteristics: (i) sustainable secular growth drivers, (ii) high barriers to competitive entry, (iii) high free cash flow after capital expenditure and working capital needs, (iv) high returns on assets and (v) niche market dominance.

The investments that we invest in are almost entirely rated below investment grade or may be unrated, which are often referred to as "leveraged loans", "high yield" or "junk" debt investments, and may be considered "high risk" or speculative compared to debt investments that are rated investment grade. Such issuers are considered more likely than investment grade issuers to default on their payments of interest and principal and such risk of default could reduce our net asset value and income distributions. Our investments are also primarily floating rate debt investments that contain interest reset provisions that may make it more difficult for borrowers to make debt repayments to us if interest rates rise. In addition, some of our debt investments will not fully amortize during their lifetime, which could result in a loss or a substantial amount of unpaid principal and interest due upon maturity. Our debt investments may also lose significant market value before a default occurs. Furthermore, an active trading market may not exist for these securities. This illiquidity may make it more difficult to value our investments.

We are offering $             in aggregate principal amount of         % notes due 2023, or the "Notes." The Notes will mature on October 1, 2023. We will pay interest quarterly on the Notes on January 1, April 1, July 1 and October 1 of each year, beginning on January 1, 2019. We may redeem the Notes in whole or in part at any time or from time to time, at the redemption price set forth under "Specific Terms of the Notes and the Offering — Optional Redemption" in this prospectus supplement. The Notes will be issued in minimum denominations of $25 and integral multiples of $25 in excess thereof.

We intend to apply to list the Notes on the New York Stock Exchange, or NYSE, and we expect trading in the Notes on the NYSE to begin within 30 days of the original issue date under the symbol "NMFX." The Notes are expected to trade "flat," which means that purchasers will not pay, and sellers will not receive, any accrued and unpaid interest on the Notes that is not reflected in the trading price. Currently, there is no public market for the Notes.

The Notes will be our unsecured obligations. As of September 18, 2018, we had $1,286.3 million of indebtedness outstanding, $731.0 million of which was secured indebtedness and $555.3 million of which was unsecured indebtedness. The Notes will be our direct unsecured obligations and rank pari passu, or equally in right of payment, with all outstanding and future unsecured, unsubordinated indebtedness issued by us.

An investment in the Notes involves risks that are described in the "Supplementary Risk Factors" section beginning on page S-21 in this prospectus supplement and the "Risk Factors" section beginning on page 27 of the accompanying prospectus.

This prospectus supplement and the accompanying prospectus contain important information about us that a prospective investor should know before investing in the Notes. Please read this prospectus supplement and the accompanying prospectus before investing and keep it for future reference. We file annual, quarterly and current reports, proxy statements and other information with the United States Securities and Exchange Commission (http://www.sec.gov), which is available free of charge by contacting us by mail at 787 Seventh Avenue, 48th Floor, New York, New York 10019 or on our website at http://www.newmountainfinance.com. Information contained on our website is not incorporated by reference into this prospectus supplement and the accompanying prospectus, and you should not consider that information to be part of this prospectus supplement and the accompanying prospectus.

Neither the United States Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities, or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

We have granted the underwriters an option to purchase up to an additional $             million aggregate principal amount of Notes on the same terms and conditions as set forth above, exercisable within 30 days from the date of this prospectus supplement. If the underwriters exercise this option in full, the total public offering price will be $             , the total sales load (discounts and commissions) paid by us will be $             , and total proceeds, before expenses, will be $             .

THE NOTES ARE NOT DEPOSITS OR OTHER OBLIGATIONS OF A BANK AND ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY.

Delivery of the Notes in book-entry form only through The Depository Trust Company will be made on or about September                           , 2018.

Prospectus Supplement dated September                                            , 2018

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ABOUT THIS PROSPECTUS SUPPLEMENT

          You should rely only on the information contained in this prospectus supplement and the accompanying prospectus. Neither we nor the underwriters have authorized any other person to provide you with different information from that contained in this prospectus supplement or the accompanying prospectus. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectus supplement and the accompanying prospectus do not constitute an offer to sell, or a solicitation of an offer to buy, these securities by any person in any jurisdiction where it is unlawful for that person to make such an offer or solicitation or to any person in any jurisdiction to whom it is unlawful to make such an offer or solicitation. The information contained in this prospectus supplement and the accompanying prospectus is complete and accurate only as of their respective dates, regardless of the time of their delivery or sale of these securities. This prospectus supplement supersedes the accompanying prospectus to the extent it contains information different from or additional to the information in that prospectus.

          This document is in two parts. The first part is this prospectus supplement, which describes the terms of this offering and also adds to and updates information contained in the accompanying prospectus. The second part is the accompanying prospectus, which gives more general information and disclosure. To the extent the information contained in this prospectus supplement differs from the information contained in the accompanying prospectus, the information in this prospectus supplement shall control. Please carefully read this prospectus supplement and the accompanying prospectus together with any exhibits and the additional information described under "Available Information", "Prospectus Supplement Summary" and "Supplementary Risk Factors" in this prospectus supplement and the "Available Information", "Summary" and "Risk Factors" sections of the accompanying prospectus before you make an investment decision. Unless otherwise indicated, all information included in this prospectus supplement assumes no exercise by the underwriters of their option to purchase up to an additional $               aggregate principal amount of Notes.

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SUPPLEMENTARY RISK FACTORS

          Investing in the Notes involves a number of significant risks. In addition to the other information contained in this prospectus supplement and the accompanying prospectus, you should consider carefully the following information before making an investment in the Notes. The risks set out below are not the only risks we face and you should read the risks set out in the accompanying prospectus. Additional risks and uncertainties not presently known to us or not presently deemed material by us might also impair our operations and performance. If any of the following events occur, our business, financial condition and results of operations could be materially and adversely affected. In such case, our net asset value and the trading price of our common stock could decline and you may lose all or part of your investment.

RISKS RELATING TO THE NOTES

Our amount of debt outstanding will increase as a result of this offering, which could adversely affect our business, financial condition and results of operations and our ability to meet our payment obligations under the Notes and our other debt.

          As of September 18, 2018, we had $1,286.3 million of indebtedness outstanding, $731.0 million of which was secured indebtedness and $555.3 million of which was unsecured indebtedness. The use of debt could have significant consequences on our future operations, including:

•

making it more difficult for us to meet our payment and other obligations under the Notes and our other outstanding debt;



•

resulting in an event of default if we fail to comply with the financial and other restrictive covenants contained in our debt agreements, which event of default could result in all of our debt becoming immediately due and payable;



•

reducing the availability of our cash flow to fund investments, acquisitions and other general corporate purposes, and limiting our ability to obtain additional financing for these purposes;



•

subjecting us to the risk of increased sensitivity to interest rate increases on our indebtedness with variable interest rates, including borrowings under our credit facilities; and



•

limiting our flexibility in planning for, or reacting to, and increasing our vulnerability to, changes in our business, the industry in which we operate and the general economy.

          Any of the above-listed factors could have an adverse effect on our business, financial condition and results of operations and our ability to meet our payment obligations under the Notes and our other debt. Our ability to meet our payment and other obligations under our debt instruments depends on our ability to generate significant cash flow in the future. This, to some extent, is subject to general economic, financial, competitive, legislative and regulatory factors as well as other factors that are beyond our control. We cannot assure you that our business will generate cash flow from operations, or that future borrowings will be available to us under our credit facilities or otherwise, in an amount sufficient to enable us to meet our payment obligations under the Notes and our other debt and to fund other liquidity needs. If we are not able to generate sufficient cash flow to service our debt obligations, we may need to refinance or restructure our debt, including the Notes, sell assets, reduce or delay capital investments, or seek to raise additional capital. If we are unable to implement one or more of these alternatives, we may not be able to meet our payment obligations under the Notes and our other debt.

If we default on our obligations to pay our other indebtedness, we may not be able to make payments on the Notes.

          Any default under the agreements governing our indebtedness or other indebtedness to which we may be a party that is not waived by the required lenders or holders, and the remedies sought by the holders of such indebtedness could make us unable to pay principal, premium, if any, and interest on the Notes and substantially decrease the market value of the Notes. If we are unable to generate

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sufficient cash flow and are otherwise unable to obtain funds necessary to meet required payments of principal, premium, if any, and interest on our indebtedness, or if we otherwise fail to comply with the various covenants, including financial and operating covenants, in the instruments governing our indebtedness, we could be in default under the terms of the agreements governing such indebtedness. In the event of such default, the holders of such indebtedness could elect to declare all the funds borrowed thereunder to be due and payable, together with accrued and unpaid interest, the lenders under our secured credit facilities could elect to terminate their commitments, cease making further loans, and institute foreclosure proceedings against our assets, and we could be forced into bankruptcy or liquidation. If our operating performance declines, we may in the future need to seek to obtain waivers from the required holders of our debt to avoid being in default. If we breach our covenants under our debt and seek a waiver, we may not be able to obtain a waiver from the required lenders or holders. If this occurs, we would be in default and our lenders or debt holders could exercise their rights as described above, and we could be forced into bankruptcy or liquidation. If we are unable to repay debt, lenders having secured obligations could proceed against the collateral securing the debt. Because our credit facilities, 2014 Convertible Notes, Unsecured Notes and 2018 Convertible Notes have, and any future credit facilities will likely have, customary cross-default provisions, if the indebtedness thereunder or under any future credit facility is accelerated, we may be unable to repay or finance the amounts due.

The Notes will be unsecured and therefore will be effectively subordinated to any secured indebtedness we have currently incurred or may incur in the future.

          The Notes will not be secured by any of our assets or any of the assets of our subsidiaries. As a result, the Notes are effectively subordinated to any secured indebtedness we or our subsidiaries have outstanding as of the date of this prospectus supplement or that we or they may incur in the future (or any indebtedness that is initially unsecured to which we subsequently grant security) to the extent of the value of the assets securing such indebtedness. In any liquidation, dissolution, bankruptcy or other similar proceeding, the holders of any of our existing or future secured indebtedness and the secured indebtedness of our subsidiaries may assert rights against the assets pledged to secure that indebtedness in order to receive full payment of their indebtedness before the assets may be used to pay other creditors, including the holders of the Notes. As of September 18, 2018, we had $1,286.3 million of indebtedness outstanding, $731.0 million of which was secured indebtedness, and therefore effectively senior to the Notes to the extent of the value of such assets, and $555.3 million of which was unsecured indebtedness.

The Notes will be structurally subordinated to the indebtedness and other liabilities of our subsidiaries.

          The Notes are obligations exclusively of NMFC and not of any of our subsidiaries. None of our subsidiaries is a guarantor of the Notes and the Notes are not required to be guaranteed by any subsidiaries we may acquire or create in the future. Except to the extent we are a creditor with recognized claims against our subsidiaries, all claims of creditors, including trade creditors, and holders of preferred stock, if any, of our subsidiaries will have priority over our equity interests in such subsidiaries (and therefore the claims of our creditors, including holders of the Notes) with respect to the assets of such subsidiaries. Even if we were recognized as a creditor of one or more of our subsidiaries, our claims would still be effectively subordinated to any security interests in the assets of any such subsidiary and to any indebtedness or other liabilities of any such subsidiary senior to our claims. Consequently, the Notes will be subordinated structurally to all indebtedness and other liabilities, including trade payables, of any of our subsidiaries and any subsidiaries that we may in the future acquire or establish as financing vehicles or otherwise. All of the existing indebtedness of our subsidiaries would be structurally senior to the Notes. In addition, our subsidiaries may incur substantial additional indebtedness in the future, all of which would be structurally senior to the Notes.

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The optional redemption provision may materially adversely affect your return on the Notes.

          The Notes will be redeemable in whole or in part upon certain conditions at any time, or from time to time, at our option on or after October 1, 2020. We may choose to redeem the Notes at times when prevailing interest rates are lower than the interest rate paid on the Notes. In this circumstance, you may not be able to reinvest the redemption proceeds in a comparable security at an effective interest rate as high as the Notes being redeemed.

A downgrade, suspension or withdrawal of a credit rating assigned by a rating agency to us or our unsecured debt, if any, or change in the debt markets could cause the liquidity or market value of the Notes to decline significantly.

          Our credit ratings are an assessment by rating agencies of our ability to pay our debts when due. Consequently, real or anticipated changes in our credit ratings will generally affect the market value of the Notes. These credit ratings may not reflect the potential impact of risks relating to the structure or marketing of the Notes. Credit ratings are not a recommendation to buy, sell or hold any security, and may be revised or withdrawn at any time by the issuing organization in its sole discretion. Neither we nor any underwriter undertakes any obligation to maintain our credit ratings or to advise holders of Notes of any changes in our credit ratings. There can be no assurance that our credit ratings will remain for any given period of time or that such credit ratings will not be lowered or withdrawn entirely by the rating agencies if in their judgment future circumstances relating to the basis of the credit ratings, such as adverse changes in our company, so warrant. The conditions of the financial markets and prevailing interest rates have fluctuated in the past and are likely to fluctuate in the future, which could have an adverse effect on the market prices of the Notes.

The indenture governing the Notes contains limited restrictive covenants and provides only limited protection in the event of a change of control.

          The indenture under which the Notes will be issued contains limited financial covenants and does not contain operating covenants or any other restrictive covenants that would limit our or our subsidiaries' ability to engage in certain transactions that may adversely affect your investment in the Notes. In particular, without limitation, the indenture does not place any restrictions on our or any of our subsidiaries' ability to:

•

unless, after giving effect to such incurrence, we will have a Debt to Equity Ratio of not greater than 1.65 to 1.00 (as set forth under "Description of the Notes — Certain Covenants — Debt to Equity Ratio" in this prospectus supplement), incur additional indebtedness or other obligations, including (1) any indebtedness or other obligations that would be equal in right of payment to the Notes, (2) any indebtedness or other obligations that would be secured and therefore rank effectively senior in right of payment to the Notes to the extent of the values of the assets securing such debt, (3) indebtedness of ours that is guaranteed by one or more of our subsidiaries and which therefore is structurally senior to the Notes and (4) securities, indebtedness or obligations issued or incurred by our subsidiaries that would be senior to our equity interests in our subsidiaries and therefore rank structurally senior to the Notes with respect to the assets of our subsidiaries;



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pay dividends on, or purchase or redeem or make any payments in respect of, capital stock or other securities ranking junior in right of payment to the Notes, including subordinated indebtedness;



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sell assets (other than certain limited restrictions on our ability to consolidate, merge or sell all or substantially all of our assets);



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create liens (including liens on the shares of our subsidiaries) or enter into sale and leaseback transactions;

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create restrictions on the payment of dividends or other amounts to us from our subsidiaries.

          However, we must maintain a Secured Debt Ratio of not greater than 0.70 to 1.00 at all times. See "Description of the Notes — Certain Covenants — Maximum Secured Debt" In this prospectus supplement.

An active trading market for the Notes may not develop or be maintained, which could limit the market price of the Notes or your ability to sell them.

          The Notes are a new issue of debt securities for which there currently is no trading market. We intend to apply to list the Notes on the NYSE within 30 days of the original issue date. Although we expect the Notes to be listed on the NYSE, we cannot provide any assurances that an active trading market will develop for the Notes or that you will be able to sell your Notes. If the Notes are traded after their initial issuance, they may trade at a discount from their initial offering price depending on prevailing interest rates, the market for similar securities, our credit ratings, general economic conditions, our financial condition, performance and prospects and other factors. The underwriters have advised us that they intend to make a market in the Notes, but they are not obligated to do so. The underwriters may discontinue any market-making in the Notes at any time at their sole discretion. Accordingly, we cannot assure you that an active trading market will develop for the Notes, that you will be able to sell your Notes at a particular time or that the price you receive when you sell will be favorable. To the extent an active trading market does not develop, the liquidity and trading price for the Notes may be harmed. Accordingly, you may be required to bear the financial risk of an investment in the Notes for an indefinite period of time.

RISKS RELATED TO OUR BUSINESS AND STRUCTURE

Our ability to achieve our investment objective depends on key investment personnel of the Investment Adviser. If the Investment Adviser were to lose any of its key investment personnel, our ability to achieve our investment objective could be significantly harmed.

          We depend on the investment judgment, skill and relationships of the investment professionals of the Investment Adviser, particularly Steven B. Klinsky, Robert A. Hamwee and John R. Kline, as well as other key personnel to identify, evaluate, negotiate, structure, execute, monitor and service our investments. The Investment Adviser, as an affiliate of New Mountain Capital, is supported by New Mountain Capital's team, which as of June 30, 2018 consisted of approximately 140 employees and senior advisors of New Mountain Capital and its affiliates to fulfill its obligations to us under the Investment Management Agreement. The Investment Adviser may also depend upon New Mountain Capital to obtain access to investment opportunities originated by the professionals of New Mountain Capital and its affiliates. Our future success depends to a significant extent on the continued service and coordination of the key investment personnel of the Investment Adviser. The departure of any of these individuals could have a material adverse effect on our ability to achieve our investment objective.

          The Investment Committee, which provides oversight over our investment activities, is provided by the Investment Adviser. The Investment Committee currently consists of five members. The loss of any member of the Investment Committee or of other senior professionals of the Investment Adviser and its affiliates without suitable replacement could limit our ability to achieve our investment objective and operate as we anticipate. This could have a material adverse effect on our financial condition, results of operation and cash flows. To achieve our investment objective, the Investment Adviser may hire, train, supervise and manage new investment professionals to participate in its investment selection and monitoring process. If the Investment Adviser is unable to find investment professionals or do so in a timely manner, our business, financial condition and results of operations could be adversely affected.

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We borrow money, which could magnify the potential for gain or loss on amounts invested in us and increase the risk of investing in us.

          We borrow money as part of our business plan. Borrowings, also known as leverage, magnify the potential for gain or loss on invested equity capital and may, consequently, increase the risk of investing in us. We expect to continue to use leverage to finance our investments, through senior securities issued by banks and other lenders. Lenders of these senior securities have fixed dollar claims on our assets that are superior to claims of our common stockholders and we would expect such lenders to seek recovery against our assets in the event of a default. If the value of our assets decreases, leveraging would cause our net asset value to decline more sharply than it otherwise would have had it not leveraged. Similarly, any decrease in our income would cause our net income to decline more sharply than it would have had it not borrowed. Such a decline could adversely affect our ability to make common stock distribution payments. In addition, because our investments may be illiquid, we may be unable to dispose of them or to do so at a favorable price in the event we need to do so if we are unable to refinance any indebtedness upon maturity and, as a result, we may suffer losses. Leverage is generally considered a speculative investment technique and increases the risks associated with investing in our securities.

          Our ability to service any debt that we incur depends largely on our financial performance and is subject to prevailing economic conditions and competitive pressures. Moreover, as the Investment Adviser's management fee is payable to the Investment Adviser based on gross assets, including those assets acquired through the use of leverage, the Investment Adviser may have a financial incentive to incur leverage which may not be consistent with our interests and the interests of our common stockholders. In addition, holders of our common stock will, indirectly, bear the burden of any increase in our expenses as a result of leverage, including any increase in the management fee payable to the Investment Adviser.

          At June 30, 2018, we had $390.5 million, $150.0 million, $155.3 million, $235.0 million, and $163.0 million of indebtedness outstanding under the Holdings Credit Facility, the NMFC Credit Facility, the 2014 Convertible Notes, the Unsecured Notes and the SBA-guaranteed debentures, respectively. The Holdings Credit Facility, the NMFC Credit Facility, the SBA-guaranteed debentures and the Unsecured Notes had weighted average interest rates of 4.0%, 4.4%, 3.2% and 5.1%, respectively, for the six months ended June 30, 2018. The interest rate on the 2014 Convertible Notes is 5.0% per annum.

          Illustration.    The following table illustrates the effect of leverage on returns from an investment in our common stock assuming various annual returns, net of expenses and adjusted for unsettled securities purchased. The calculations in the table below are hypothetical. Actual returns may be higher or lower than those appearing below. The calculation assumes (i) $2,205.9 million in total assets, (ii) a weighted average cost of borrowings of 4.3%, which assumes the weighted average interest rates as of June 30, 2018 for the Holdings Credit Facility, the NMFC Credit Facility, Unsecured Notes and the SBA-guaranteed debentures and the interest rate as of June 30, 2018 for the 2014 Convertible Notes, (iii) $1,093.8 million in debt outstanding and (iv) $1,032.6 million in net assets. This table excludes the impact of our July 5, 2018 issuance of the 2018B Unsecured Notes and our August 20, 2018 issuance of the 2018 Convertible Notes as each issuance occurred after June 30, 2018.

Assumed Return on Our Portfolio

(net of expenses)

If we are unable to obtain additional debt financing, or if our borrowing capacity is materially reduced, our business could be materially adversely affected.

          We may want to obtain additional debt financing, or need to do so upon maturity of our credit facilities, in order to obtain funds which may be made available for investments. The Holdings Credit

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Facility, the NMFC Credit Facility, the 2014 Convertible Notes and the 2018 Convertible Notes mature on October 24, 2022, June 4, 2022, June 15, 2019 and August 15, 2023, respectively. Our $90.0 million in aggregate principal amount of the 2016 Unsecured Notes will mature on May 15, 2021, our $55.0 million in aggregate principal amount of the 2017A Unsecured Notes will mature on July 15, 2022, our $90.0 million in aggregate principal amount of the 2018A Unsecured Notes will mature on January 30, 2023 and our $50.0 million in aggregate principal amount of 2018B Unsecured Notes will mature on June 28, 2023. The SBA-guaranteed debentures have ten year maturities and will begin to mature on March 1, 2025. If we are unable to increase, renew or replace any such facilities and enter into new debt financing facilities or other debt financing on commercially reasonable terms, our liquidity may be reduced significantly. In addition, if we are unable to repay amounts outstanding under any such facilities and are declared in default or are unable to renew or refinance these facilities, we may not be able to make new investments or operate our business in the normal course. These situations may arise due to circumstances that we may be unable to control, such as lack of access to the credit markets, a severe decline in the value of the U.S. dollar, an economic downturn or an operational problem that affects us or third parties, and could materially damage our business operations, results of operations and financial condition.

RISKS RELATED TO OUR OPERATIONS

Regulations governing the operations of BDCs will affect our ability to raise additional equity capital as well as our ability to issue senior securities or borrow for investment purposes, any or all of which could have a negative effect on our investment objectives and strategies.

          Our business requires a substantial amount of capital. We may acquire additional capital from the issuance of senior securities, including borrowing under a credit facility or other indebtedness. In addition, we may also issue additional equity capital, which would in turn increase the equity capital available to us. However, we may not be able to raise additional capital in the future on favorable terms or at all.

          We may issue debt securities, preferred stock, and we may borrow money from banks or other financial institutions, which we refer to collectively as "senior securities", up to the maximum amount permitted by the 1940 Act. The 1940 Act permits us to issue senior securities in amounts such that our asset coverage, as defined in the 1940 Act, equals at least 150.0% after each issuance of senior securities. As a result of our SEC exemptive relief, we are permitted to exclude our SBA-guaranteed debentures from the definition of senior securities in the 150.0% asset coverage ratio we are required to maintain under the 1940 Act. If our asset coverage ratio is not at least 150.0% we would be unable to issue senior securities, and if we had senior securities outstanding (other than any indebtedness issued in consideration of a privately arranged loan, such as any indebtedness outstanding under the Holdings Credit Facility and NMFC Credit Facility), we would be unable to make distributions to our stockholders. However, at June 30, 2018, our only senior securities outstanding were indebtedness under the Holdings Credit Facility, NMFC Credit Facility, 2014 Convertible Notes and Unsecured Notes and therefore at June 30, 2018, we would not have been precluded from paying distributions. If the value of our assets declines, we may be unable to satisfy this test. If that happens, we may be required to liquidate a portion of our investments and repay a portion of our indebtedness at a time when such sales may be disadvantageous.

          The Holdings Credit Facility matures on October 24, 2022 and permits borrowings of $495.0 million as of June 30, 2018. The Holdings Credit Facility had $390.5 million in debt outstanding as of June 30, 2018. The NMFC Credit Facility matures on June 4, 2022 and permits borrowings of $150.0 million as of June 30, 2018. The NMFC Credit Facility had $150.0 million in debt outstanding as of June 30, 2018. The 2014 Convertible Notes mature on June 15, 2019. The 2014 Convertible Notes had $155.3 million in debt outstanding as of June 30, 2018. The 2018 Convertible Notes were issued on August 20, 2018 and mature on August 15, 2023. The 2016 Unsecured Notes, 2017A Unsecured Notes and 2018A Unsecured Notes mature on May 15, 2021, July 15, 2022 and January 30, 2023, respectively,

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and had $90.0 million, $55.0 million and $90.0 million, respectively, in debt outstanding as of June 30, 2018. The $50.0 million in aggregate principal amount of 2018B Unsecured Notes were issued on July 5, 2018 and mature on June 28, 2023. The SBA-guaranteed debentures have ten year maturities and will begin to mature on March 1, 2025. As of June 30, 2018, $163.0 million of SBA-guaranteed debentures were outstanding.

          In addition, we may in the future seek to securitize other portfolio securities to generate cash for funding new investments. To securitize loans, we would likely create a wholly-owned subsidiary and contribute a pool of loans to the subsidiary. We would then sell interests in the subsidiary on a non-recourse basis to purchasers and we would retain all or a portion of the equity in the subsidiary. If we are unable to successfully securitize its loan portfolio, which must be done in compliance with the relevant restrictions in the Holdings Credit Facility, our ability to grow our business or fully execute our business strategy could be impaired and our earnings, if any, could decrease. The securitization market is subject to changing market conditions, and we may not be able to access this market when it would be otherwise deemed appropriate. Moreover, the successful securitization of our portfolio might expose us to losses as the residual investments in which we do not sell interests will tend to be those that are riskier and more apt to generate losses. The 1940 Act also may impose restrictions on the structure of any securitization.

          We may also obtain capital through the issuance of additional equity capital. As a BDC, we generally are not able to issue or sell our common stock at a price below net asset value per share. If our common stock trades at a discount to our net asset value per share, this restriction could adversely affect our ability to raise equity capital. We may, however, sell our common stock, or warrants, options or rights to acquire our common stock, at a price below our net asset value per share of the common stock if our board of directors and independent directors determine that such sale is in our best interests and the best interests of our stockholders, and our stockholders approve such sale. In any such case, the price at which our securities are to be issued and sold may not be less than a price that, in the determination of our board of directors, closely approximates the market value of such securities (less any underwriting commission or discount). If we raise additional funds by issuing more shares of our common stock, or if we issue senior securities convertible into, or exchangeable for, our common stock, the percentage ownership of our stockholders may decline and you may experience dilution.

RISKS RELATING TO OUR INVESTMENTS

Our portfolio may be concentrated in a limited number of industries, which may subject us to a risk of significant loss if there is a downturn in a particular industry in which a number of our investments are concentrated.

          Our portfolio may be concentrated in a limited number of industries. For example, as of June 30, 2018, our investments in the business services and the software industries represented approximately 32.8% and 15.7%, respectively, of the fair value of our portfolio. A downturn in any particular industry in which we are invested could significantly impact the portfolio companies operating in that industry, and accordingly, the aggregate returns that we realize from our investment in such portfolio companies.

          Specifically, companies in the business services industry are subject to general economic downturns and business cycles, and will often suffer reduced revenues and rate pressures during periods of economic uncertainty. In addition, companies in the software industry often have narrow product lines and small market shares. Because of rapid technological change, the average selling prices of products and some services provided by software companies have historically decreased over their productive lives. As a result, the average selling prices of products and services offered by software companies in which we invest may decrease over time. If an industry in which we have significant investments suffers from adverse business or economic conditions, as these industries have to varying degrees, a material portion of our investment portfolio could be affected adversely, which, in turn, could adversely affect our financial position and results of operations.

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CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

          This prospectus supplement and the accompanying prospectus contain forward-looking statements that involve substantial risks and uncertainties. These forward-looking statements are not historical facts, but rather are based on current expectations, estimates and projections about us, our current and prospective portfolio investments, our industry, our beliefs, and our assumptions. Words such as "anticipate", "believe", "continue", "could", "estimate", "expect", "intend", "may", "plan", "potential", "project", "seek", "should", "target", "will", "would" or variations of these words and similar expressions are intended to identify forward-looking statements. The forward-looking statements contained in this prospectus supplement and the accompanying prospectus involve risks and uncertainties, including statements as to:

•

the preliminary estimates of our net asset value and adjusted net investment income;



•

our future operating results;



•

our business prospects and the prospects of our portfolio companies;



•

the impact of investments that we expect to make;



•

our contractual arrangements and relationships with third parties;



•

the dependence of our future success on the general economy and its impact on the industries in which we invest;



•

the ability of our portfolio companies to achieve their objectives;



•

our expected financings and investments;



•

the adequacy of our cash resources and working capital; and



•

the timing of cash flows, if any, from the operations of our portfolio companies.

          These statements are not guarantees of future performance and are subject to risks, uncertainties, and other factors, some of which are beyond our control and difficult to predict and could cause actual results to differ materially from those expressed or forecasted in the forward-looking statements, including without limitation:

•

an economic downturn could impair our portfolio companies' ability to continue to operate, which could lead to the loss of some or all of our investments in such portfolio companies;



•

a contraction of available credit and/or an inability to access the equity markets could impair our lending and investment activities;



•

interest rate volatility could adversely affect our results, particularly if we elect to use leverage as part of our investment strategy;



•

currency fluctuations could adversely affect the results of our investments in foreign companies, particularly to the extent that we receive payments denominated in foreign currency rather than U.S. dollars; and



•

the risks, uncertainties and other factors we identify in "Supplementary Risk Factors" in this prospectus supplement and "Risk Factors" in the accompanying prospectus, and elsewhere in this prospectus supplement, the accompanying prospectus and in our filings with the SEC.

          Although we believe that the assumptions on which these forward-looking statements are based are reasonable, any of those assumptions could prove to be inaccurate, and as a result, the forward-looking statements based on those assumptions also could be inaccurate. Important assumptions include our ability to originate new loans and investments, certain margins and levels of profitability and the availability of additional capital. In light of these and other uncertainties, the inclusion of a projection or forward-looking statement in this prospectus supplement or the accompanying prospectus should not be

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regarded as a representation by us that our plans and objectives will be achieved. These risks and uncertainties include those described or identified in "Supplementary Risk Factors" in this prospectus supplement and "Risk Factors" in the accompanying prospectus, and elsewhere in this prospectus supplement and the accompanying prospectus. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this prospectus supplement. However, we will update this prospectus supplement to reflect any material changes to the information contained herein. The forward-looking statements and projections contained in this prospectus supplement are excluded from the safe harbor protection provided by Section 27A of the Securities Act.

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CAPITALIZATION

          The following table sets forth our capitalization as of June 30, 2018:

•

on an actual basis;



•

on an as adjusted basis to give effect to the issuance of (i) $50.0 million in aggregate principal amount of 5.36% Series 2018B Notes due June 28, 2023 issued on July 5, 2018 to an institutional investor in a private placement; and (ii) $115.0 million aggregate principal amount of 2018 Convertible Notes due August 15, 2023 issued in August 2018; and



•

on a further adjusted basis to give effect to the assumed sale of $              million aggregate principal amount of Notes (assuming no exercise of the overallotment option), excluding accrued interest, after deducting the underwriting discounts and commissions of approximately $              million payable by us and estimated offering expenses of approximately $0.3 million payable by us, and without giving effect to the use of the cash proceeds from such sale as described in "Use of Proceeds".

          You should read this table together with "Use of Proceeds" and the financial statements and related notes thereto included elsewhere in this prospectus supplement and the accompanying prospectus.

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USE OF PROCEEDS

          We estimate that the net proceeds we will receive from the sale of the $              million aggregate principal amount of Notes in this offering will be approximately $             (or approximately $             if the underwriters fully exercise their overallotment option), after deducting the discounts, commissions and expenses payable by us.

          We intend to use the net proceeds from this offering to repay outstanding indebtedness under the NMFC Credit Facility and then, to the extent any net proceeds remain, the Holdings Credit Facility. However, through re-borrowing under our credit facilities, we intend to make new investments in accordance with our investment objective and strategies described in this prospectus supplement and the accompanying prospectus and use available capital for other general corporate purposes, including working capital requirements. We are continuously identifying, reviewing and, to the extent consistent with our investment objective, funding new investments. As a result, we typically raise capital as we deem appropriate to fund such new investments.

          Under the NMFC Credit Facility, which matures in June 2022, we had $145.0 million outstanding as of September 18, 2018. Borrowings under the NMFC Credit Facility generally bear interest at a rate of LIBOR plus 2.50% per annum or the prime rate plus 1.50% per annum. Under the Holdings Credit Facility, which matures in December 2022, we had $345.0 million outstanding as of September 18, 2018. Borrowings under the Holdings Credit Facility bear interest at a rate of LIBOR plus 1.75% per annum for broadly syndicated loans and LIBOR plus 2.25% per annum for all other investments. As of September 18, 2018, we had $155.3 million, $285.0 million, $165.0 million and $115.0 million outstanding in connection with the 2014 Convertible Notes, the Unsecured Notes, the SBA-guaranteed debentures and the 2018 Convertible Notes, respectively. For additional information regarding our outstanding indebtedness, see "Management's Discussion and Analysis of Financial Condition and Results of Operations — Liquidity and Capital Resources" in this prospectus supplement and the accompanying prospectus.

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MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS

          The information contained in this section should be read in conjunction with the Selected Financial and Other Data and our Financial Statements and notes thereto appearing elsewhere in this prospectus supplement and the accompanying prospectus. The following discussion and other parts of this prospectus supplement and the accompanying prospectus contain forward-looking information that involves risks and uncertainties. Our actual results could differ materially from those anticipated by such forward-looking information due to the factors discussed under "Supplementary Risk Factors" and "Cautionary Statement Regarding Forward-Looking Statements" appearing elsewhere in this prospectus supplement and "Risk Factors" and "Cautionary Statement Regarding Forward-Looking Statements" in the accompanying prospectus.

Overview

          We are a Delaware corporation that was originally incorporated on June 29, 2010 and completed our IPO on May 19, 2011. We are a closed-end, non-diversified management investment company that has elected to be regulated as a BDC under the 1940 Act. As such, we are obligated to comply with certain regulatory requirements. We have elected to be treated, and intend to comply with the requirements to continue to qualify annually, as a RIC under Subchapter M of the Code. NMFC is also registered as an investment adviser under the Advisers Act. Since our IPO, and through June 30, 2018, we raised approximately $614.6 million in net proceeds from additional offerings of common stock.

          The Investment Adviser is a wholly-owned subsidiary of New Mountain Capital. New Mountain Capital is a firm with a track record of investing in the middle market. New Mountain Capital focuses on investing in defensive growth companies across its private equity, public equity and credit investment vehicles. The Investment Adviser manages our day-to-day operations and provides us with investment advisory and management services. The Administrator provides the administrative services necessary to conduct our day-to-day operations.

          Our wholly-owned subsidiary, NMF Holdings, is a Delaware limited liability company whose assets are used to secure NMF Holdings' credit facility. NMF Ancora, NMF QID and NMF YP, our wholly-owned subsidiaries, are structured as Delaware entities that serve as tax blocker corporations which hold equity or equity-like investments in portfolio companies organized as limited liability companies (or other forms of pass-through entities). We consolidate our tax blocker corporations for accounting purposes. The tax blocker corporations are not consolidated for income tax purposes and may incur income tax expense as a result of their ownership of the portfolio companies. Additionally, our wholly-owned subsidiary, NMF Servicing, serves as the administrative agent on certain investment transactions. SBIC I and its general partner, SBIC I GP, were organized in Delaware as a limited partnership and limited liability company, respectively. SBIC II and its general partner, SBIC II GP, were also organized in Delaware as a limited partnership and limited liability company, respectively. SBIC I, SBIC I GP, SBIC II and SBIC II GP are our consolidated wholly-owned direct and indirect subsidiaries. SBIC I and SBIC II received licenses from the SBA to operate as SBICs under Section 301(c) of the 1958 Act. Our wholly-owned subsidiary, NMNLC, a Maryland corporation, was formed to acquire commercial real properties that are subject to "triple net" leases and has qualified and intends to continue to qualify as a real estate investment trust, or REIT, within the meaning of Section 856(a) of the Code.

          Our investment objective is to generate current income and capital appreciation through the sourcing and origination of debt securities at all levels of the capital structure, including first and second lien debt, notes, bonds and mezzanine securities. The first lien debt may include traditional first lien senior secured loans or unitranche loans. Unitranche loans combine characteristics of traditional first lien senior secured loans as well as second lien and subordinated loans. Unitranche loans will expose us to the risks associated with second lien and subordinated loans to the extent we invest in the "last out" tranche. In some cases, our investments may also include equity interests.

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          Our primary focus is in the debt of defensive growth companies, which are defined as generally exhibiting the following characteristics: (i) sustainable secular growth drivers, (ii) high barriers to competitive entry, (iii) high free cash flow after capital expenditure and working capital needs, (iv) high returns on assets and (v) niche market dominance. Similar to us, SBIC I's and SBIC II's investment objectives are to generate current income and capital appreciation under our investment criteria. However, SBIC I's and SBIC II's investments must be in SBA eligible small businesses. Our portfolio may be concentrated in a limited number of industries. As of June 30, 2018, our top five industry concentrations were business services, software, healthcare services, education and investment funds.

          As of June 30, 2018, our net asset value was $1,032.6 million and our portfolio had a fair value of approximately $2,098.0 million in 89 portfolio companies, with a weighted average yield to maturity at cost for income producing investments ("YTM at Cost") of approximately 11.1% and a weighted average yield to maturity at cost for all investments ("YTM at Cost for Investments") of approximately 10.9%. The YTM at Cost calculation assumes that all investments, including secured collateralized agreements, not on non-accrual are purchased at cost on the quarter end date and held until their respective maturities with no prepayments or losses and exited at par at maturity. The YTM at Cost for Investments calculation assumes that all investments, including secured collateralized agreements, are purchased as cost on the quarter end date and held until their respective maturities with no prepayments or losses and exited at par at maturity. YTM at Cost and YTM at Cost for Investments calculations exclude the impact of existing leverage. YTM at Cost and YTM at Cost for Investments uses the London Interbank Offered Rate ("LIBOR") curves at each quarter's end date. The actual yield to maturity may be higher or lower due to the future selection of the LIBOR contracts by the individual companies in our portfolio or other factors.

Recent Developments

          On July 5, 2018, we entered into a third supplement (the "Supplement") to our Amended and Restated Note Purchase Agreement, dated September 30, 2016 (the "NPA"). Pursuant to the Supplement, on July 5, 2018, we issued to an institutional investor identified therein, in a private placement, $50.0 million in aggregate principal amount of 5.36% Series 2018B Notes due June 28, 2023 (the "2018B Unsecured Notes") as an additional series of notes under the NPA. Except as set forth in the Supplement, the 2018B Unsecured Notes have the same terms as the $90.0 million in aggregate principal amount of the 5.313% Notes due May 15, 2021, the $55.0 million in aggregate principal amount of the 4.76% Series 2017A Notes due July 15, 2022 and the $90.0 million in aggregate principal amount of 4.87% Series 2018A Notes due January 30, 2023 (collectively, the "Prior Notes") that we previously issued pursuant to the NPA, the first supplement and the second supplement thereto, respectively. The Supplement includes certain additional covenants and terms, including, without limitation, a requirement that we not exceed a debt-to-equity ratio of 1.65 to 1.00 at the time of incurring additional indebtedness and a requirement that we not exceed a secured debt ratio of 0.70 to 1.00 at any time. The 2018B Unsecured Notes will rank equal in priority with our other unsecured indebtedness, including the Prior Notes. Interest on the 2018B Unsecured Notes will be payable semi-annually in arrears on January 15 and July 15 of each year, commencing on January 15, 2019.

          On July 5, 2018, we entered into Amendment No. 4 (the "Amendment") to our NMFC Credit Facility (as defined below). The Amendment reduces the minimum asset coverage ratio that we must maintain at the time of any borrowing under the NMFC Credit Facility (as defined below) and as of each quarter end from 2.00 to 1.00 to 1.50 to 1.00. The Amendment also includes a requirement that we not exceed a debt-to-equity ratio of 1.65 to 1.00 at the time of incurring additional indebtedness and a requirement that we not exceed a secured debt ratio of 0.70 to 1.00 at any time.

          On August 1, 2018, our board of directors declared a third quarter 2018 distribution of $0.34 per share payable on September 28, 2018 to holders of record as of September 14, 2018.

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          We had approximately $169.6 million of originations and commitments since the end of the second quarter through August 3, 2018. This was offset by approximately $178.9 million of repayments and $3.4 million of sales during the same period.

          On August 20, 2018, we closed an offering of $100.0 million aggregate principal amount of the 2018 Convertible Notes, pursuant to the Convertible Notes Indenture. On August 30, 2018, we closed an offering of an additional $15.0 million aggregate principal amount of the 2018 Convertible Notes. These additional 2018 Convertible Notes constitute a further issuance of, rank equally in right of payment with, and form a single series with the $100.0 million aggregate principal amount of 2018 Convertible Notes that we issued on August 20, 2018. The 2018 Convertible Notes bear interest at an annual rate of 5.75%, payable semi-annually on February 15 and August 15 of each year, commencing on February 15, 2019. The 2018 Convertible Notes will mature on August 15, 2023 unless earlier converted or repurchased at the holder's option.

Critical Accounting Policies

          The preparation of financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and revenues and expenses during the periods reported. Actual results could materially differ from those estimates. We have identified the following items as critical accounting policies.

Basis of Accounting

          We consolidate our wholly-owned direct and indirect subsidiaries: NMF Holdings, NMF Servicing, NMNLC, SBIC I, SBIC I GP, SBIC II, SBIC II GP, NMF Ancora, NMF QID and NMF YP. We are an investment company following accounting and reporting guidance as described in Accounting Standards Codification Topic 946, Financial Services — Investment Companies, ("ASC 946").

Valuation and Leveling of Portfolio Investments

          At all times consistent with GAAP and the 1940 Act, we conduct a valuation of assets, which impacts our net asset value.

          We value our assets on a quarterly basis, or more frequently if required under the 1940 Act. In all cases, our board of directors is ultimately and solely responsible for determining the fair value of our portfolio investments on a quarterly basis in good faith, including investments that are not publicly traded, those whose market prices are not readily available and any other situation where our portfolio investments require a fair value determination. Security transactions are accounted for on a trade date basis. Our quarterly valuation procedures are set forth in more detail below:

(1)

Investments for which market quotations are readily available on an exchange are valued at such market quotations based on the closing price indicated from independent pricing services.



(2)

Investments for which indicative prices are obtained from various pricing services and/or brokers or dealers are valued through a multi-step valuation process, as described below, to determine whether the quote(s) obtained is representative of fair value in accordance with GAAP.



a.

Bond quotes are obtained through independent pricing services. Internal reviews are performed by the investment professionals of the Investment Adviser to ensure that the quote obtained is representative of fair value in accordance with GAAP and, if so, the quote is used. If the Investment Adviser is unable to sufficiently validate the quote(s) internally and if the investment's par value or its fair value exceeds the materiality

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threshold, the investment is valued similarly to those assets with no readily available quotes (see (3) below); and

b.

For investments other than bonds, we look at the number of quotes readily available and perform the following procedures:



i.

Investments for which two or more quotes are received from a pricing service are valued using the mean of the mean of the bid and ask of the quotes obtained;



ii.

Investments for which one quote is received from a pricing service are validated internally. The investment professionals of the Investment Adviser analyze the market quotes obtained using an array of valuation methods (further described below) to validate the fair value. If the Investment Adviser is unable to sufficiently validate the quote internally and if the investment's par value or its fair value exceeds the materiality threshold, the investment is valued similarly to those assets with no readily available quotes (see (3) below).



(3)

Investments for which quotations are not readily available through exchanges, pricing services, brokers, or dealers are valued through a multi-step valuation process:



a.

Each portfolio company or investment is initially valued by the investment professionals of the Investment Adviser responsible for the credit monitoring;



b.

Preliminary valuation conclusions will then be documented and discussed with our senior management;



c.

If an investment falls into (3) above for four consecutive quarters and if the investment's par value or its fair value exceeds the materiality threshold, then at least once each fiscal year, the valuation for each portfolio investment for which we do not have a readily available market quotation will be reviewed by an independent valuation firm engaged by our board of directors; and



d.

When deemed appropriate by our management, an independent valuation firm may be engaged to review and value investment(s) of a portfolio company, without any preliminary valuation being performed by the Investment Adviser. The investment professionals of the Investment Adviser will review and validate the value provided.

          For investments in revolving credit facilities and delayed draw commitments, the cost basis of the funded investments purchased is offset by any costs/netbacks received for any unfunded portion on the total balance committed. The fair value is also adjusted for the price appreciation or depreciation on the unfunded portion. As a result, the purchase of a commitment not completely funded may result in a negative fair value until it is called and funded.

          The values assigned to investments are based upon available information and do not necessarily represent amounts which might ultimately be realized, since such amounts depend on future circumstances and cannot be reasonably determined until the individual positions are liquidated. Due to the inherent uncertainty of determining the fair value of investments that do not have a readily available market value, the fair value of our investments may fluctuate from period to period and the fluctuations could be material.

          GAAP fair value measurement guidance classifies the inputs used in measuring fair value into three levels as follows:

          Level I — Quoted prices (unadjusted) are available in active markets for identical investments and we have the ability to access such quotes as of the reporting date. The type of investments which would generally be included in Level I include active exchange-traded equity securities and exchange-traded derivatives. As required by Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures ("ASC 820"), we, to the extent that we hold such investments, do not adjust the quoted price

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for these investments, even in situations where we hold a large position and a sale could reasonably impact the quoted price.

          Level II — Pricing inputs are observable for the investments, either directly or indirectly, as of the reporting date, but are not the same as those used in Level I. Level II inputs include the following:

•

Quoted prices for similar assets or liabilities in active markets;



•

Quoted prices for identical or similar assets or liabilities in non-active markets (examples include corporate and municipal bonds, which trade infrequently);



•

Pricing models whose inputs are observable for substantially the full term of the asset or liability (examples include most over-the-counter derivatives, including foreign exchange forward contracts); and



•

Pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full term of the asset or liability.

          Level III — Pricing inputs are unobservable for the investment and include situations where there is little, if any, market activity for the investment.

          The inputs used to measure fair value may fall into different levels. In all instances when the inputs fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level of input that is significant to the fair value measurement in its entirety. As such, a Level III fair value measurement may include inputs that are both observable and unobservable. Gains and losses for such assets categorized within the Level III table below may include changes in fair value that are attributable to both observable inputs and unobservable inputs.

          The inputs into the determination of fair value require significant judgment or estimation by management and consideration of factors specific to each investment. A review of the fair value hierarchy classifications is conducted on a quarterly basis. Changes in the observability of valuation inputs may result in the transfer of certain investments within the fair value hierarchy from period to period. Reclassifications impacting the fair value hierarchy are reported as transfers in/out of the respective leveling categories as of the beginning of the period in which the reclassifications occur. The following table summarizes the levels in the fair value hierarchy that our portfolio investments fall into as of June 30, 2018: