Filed Pursuant to Rule 497

Registration File No. 333-214405

STIRA ALCENTRA GLOBAL CREDIT FUND

SUPPLEMENT NO. 6 DATED DECEMBER 6, 2018

TO THE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION,

EACH DATED APRIL 30, 2018

This document supplements, and should be read in conjunction with, the Fund’s prospectus and statement of additional information, each dated April 30, 2018, as supplemented by Supplement No. 1, dated May 7, 2018, Supplement No. 2, dated June 7, 2018, Supplement No. 3, dated July 18, 2018, Supplement No. 4, dated September 12, 2018, and Supplement No. 5, dated September 17, 2018, relating to the Fund’s public offering of up to $3,000,000,000 in Class A Shares, Class T Shares, Class D Shares, Class I Shares, and Class C Shares. Terms used and not otherwise defined in this Supplement No. 6 shall have the same meanings as set forth in the Fund’s prospectus. The purpose of this Supplement No. 6 is to disclose:

Update Regarding the Fund’s Consideration of Strategic Alternatives

As previously reported in Supplement No. 5, the Fund’s Board of Trustees (the “Board”) determined to suspend the offering of the Fund’s common shares of beneficial interest, effective September 17, 2018. The Board is currently evaluating a range of strategic alternatives and expects to provide details to shareholders before the end of December 2018. At this time, the Board has not declared the accrual of any distributions to shareholders for the month of December 2018.

Termination of Expense Support Agreement

In connection with the decision of the Board to suspend the offering of the Fund’s common shares of beneficial interest and to evaluate strategic alternatives, the Adviser terminated the Expense Support Agreement, effective October 29, 2018. Pursuant to the Expense Support Agreement, the Adviser previously reimbursed the Fund for expenses in an amount that was sufficient to: (i) ensure that no portion of the Fund’s distributions to shareholders were paid from offering proceeds or borrowings, and/or (ii) reduce the Fund’s operating expenses until it had achieved economies of scale sufficient to ensure that it bears a reasonable level of expense in relation to its investment income. The Fund has a conditional obligation to reimburse the Adviser for certain amounts funded by the Adviser under such agreement, including certain organization and offering costs that have been included in operating expenses, if certain conditions are met.

Suspension of the Fund’s Share Repurchase Program

As disclosed in the Fund’s prospectus, the Fund intended to commence its quarterly share repurchase program beginning with the calendar quarter ending December 31, 2018. In light of the fact that the Board continues to evaluate strategic alternatives, the Board believes it is in the best interests of the Fund’s shareholders to suspend the share repurchase program while such considerations are ongoing.

Quarterly Schedule of Portfolio Holdings

On November 21, 2018, the Fund filed with the Securities and Exchange Commission its Quarterly Schedule of Portfolio Holdings on Form N-Q for the quarter ended September 30, 2018. A copy of the Fund’s schedule of investments as of September 30, 2018, and the notes thereto, are attached to this Supplement No. 6 as Exhibit A. 

Exhibit A

SCHEDULE OF INVESTMENTS

AS OF SEPTEMBER 30, 2018, AND THE NOTES THERETO

Stira Alcentra Global Credit Fund

Schedule of Investments

As of September 30, 2018

(Unaudited)

See notes to unaudited financial statements

Stira Alcentra Global Credit Fund

Schedule of Investments

As of September 30, 2018

(Unaudited)

See notes to unaudited financial statements

Stira Alcentra Global Credit Fund

Schedule of Investments

As of September 30, 2018

(Unaudited)

See notes to unaudited financial statements

Stira Alcentra Global Credit Fund

Schedule of Investments

As of September 30, 2018

(Unaudited)

See notes to unaudited financial statements

Stira Alcentra Global Credit Fund

Schedule of Investments

As of September 30, 2018

(Unaudited)

See notes to unaudited financial statements

Stira Alcentra Global Credit Fund

Schedule of Investments

As of September 30, 2018

(Unaudited)

See notes to unaudited financial statements

STIRA ALCENTRA GLOBAL CREDIT FUND

NOTES TO SCHEDULE OF INVESTMENTS

September 30, 2018

(Unaudited)

Note 1. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying financial statement of Stira Alcentra Global Credit Fund (the “Fund”) has been prepared on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“GAAP”) and pursuant to the requirements for reporting in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 946, Financial Services — Investment Companies. In the opinion of management, the financial results included herein contain all adjustments and reclassifications considered necessary for the fair presentation of financial statements for the period included herein. The accounting records of the Fund are maintained in United States dollars, the functional currency of the Fund.

Note 2. Fair Value of Financial Instruments

The Fund accounts for its investments in accordance with FASB ASC Topic 820 (“ASC Topic 820”), Fair Value Measurements and Disclosures, which defines fair value and establishes a framework for measuring fair value. ASC Topic 820 defines fair value as the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC Topic 820 also establishes a fair value hierarchy which prioritizes and ranks the level of market price observability used in measuring investments at fair value.

Market price observability is impacted by a number of factors, including the type of investment, the characteristics specific to the investment, and the state of the marketplace (including the existence and transparency of transactions between market participants). Investments with readily available actively quoted prices or for which fair value can be measured from actively-quoted prices in an orderly market will generally have a higher degree of market price observability and a lesser degree of judgment used in measuring fair value.

Investments measured and reported at fair value are classified and disclosed in one of the following categories (from highest to lowest) based on inputs:

Level 1 — Quoted prices (unadjusted) are available in active markets for identical investments that the Fund has the ability to access as of the reporting date. The type of investments which would generally be included in Level 1 includes listed equity securities and listed derivatives. As required by ASC Topic 820, the Fund, to the extent that it holds such investments, does not adjust the quoted price for these investments, even in situations where the Fund holds a large position and a sale could reasonably impact the quoted price.

Level 2 — Other significant observable inputs, including but not limited to, quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in non-active markets, including actionable bids from third parties for privately held assets or liabilities, and inputs other than quoted prices that are observable (either directly or indirectly) at the measurement date, such as yield curves and forward currency rates that are entered directly into valuation models to determine the value of derivatives or other assets or liabilities.

Level 3 — Pricing inputs are unobservable for the investment and include situations where there is little, if any, market activity for the investment. The inputs into the determination of fair value require significant judgment or estimation by the Fund. The types of investments which would generally be included in this category include debt and equity securities issued by private entities.

In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the determination of which category within the fair value hierarchy is appropriate for any given investment is based on the lowest level of input that is significant to the fair value measurement. The Fund’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the investment.

Level 1 and Level 2 Fair Value Investments - The valuation techniques and significant inputs used in determining the fair values for investments classified as Level 1 and Level 2 are as follows:

Debt Securities - Debt securities for which market quotations are readily available are valued daily on the basis of quotations supplied by dealers or an independent pricing service approved by the Fund’s Board of Trustees (the “Board of Trustees”). The pricing services may use valuation models or matrix pricing, which consider: (i) yield or price with respect to bonds that are considered comparable in characteristics such as rating, interest rate and maturity date or (ii) quotations from securities dealers to determine current value. Short-term debt obligations that mature in sixty days or less and that do not exhibit signs of credit deterioration are valued using available market quotations as provided by a third party pricing vendor or broker. With the exception of treasury securities of G8 countries, which are generally classified as Level 1, these investments are generally classified as Level 2 of the fair value hierarchy.

STIRA ALCENTRA GLOBAL CREDIT FUND

NOTES TO SCHEDULE OF INVESTMENTS

September 30, 2018

(Unaudited)

Bank Loans — Bank loans (“Loans”) are interests in amounts owed by corporate, governmental, or other borrowers to lenders or lending syndicates. Loans are arranged through private negotiations between the borrower and one or more financial institutions (“Lenders”). The Fund’s investments in Loans are in the form of either participations in Loans (“Participations”) or assignments of all or a portion of Loans from third parties (“Assignments”). With respect to Participations, a Fund has the right to receive payments of principal, interest and any fees to which it is entitled from the Lender selling the Participations and only upon receipt by the Lender of the payments from the borrower. The Fund generally has no right to enforce compliance by the borrower with the terms of the loan agreement with respect to Participations. Conversely, assignments result in a Fund having a direct contractual relationship with the borrower, and the Fund may be permitted to enforce compliance by the borrower with the terms of the loan agreement.

When reliable market quotations are not considered to be readily available, which may be the case for restricted securities, certain debt securities, preferred stocks and foreign stocks, the investments are valued at their fair value as determined by management under procedures established and periodically reviewed by the Board of Trustees.

The Fund’s policy is to disclose transfers between Levels based on valuations at the end of the reporting period. The portfolio may hold securities which are periodically valued in accordance with the Fund’s fair value procedures. This may result in movements between Level 1 and Level 2 throughout the period. For the period ended September 30, 2018, there were no transfers between Level 1, 2 or 3.

The fair values of the Fund’s investments disaggregated into the three levels of the fair value hierarchy based upon the lowest level of significant input used in the valuation as of September 30, 2018, are as follows:

The following is a reconciliation of Level 3 investments for the period ended September 30, 2018:

Note 3. Commitments and Contingencies

In the normal course of business, the Fund enters into contracts that contain a variety of representations and warranties and which provide general indemnifications. In addition, the Fund has agreed to indemnify its officers, directors, employees, agents or any person who serves on behalf of the Fund from any loss, claim, damage, or liability which such person incurs by reason of their performance of activities for the Fund, provided they acted in good faith. The Fund expects the risk of loss related to its indemnifications to be remote.

The Fund’s investment portfolio may contain debt investments that are in the form of lines of credit and unfunded delayed draw commitments, which require the Fund to provide funding when requested by portfolio companies in accordance with the terms of the underlying loan agreements. As of September 30, 2018, the Fund’s unfunded commitments under loan and financing agreements are presented below:

STIRA ALCENTRA GLOBAL CREDIT FUND

NOTES TO SCHEDULE OF INVESTMENTS

September 30, 2018

(Unaudited)

Note 4. Investment Portfolio

As of September 30, 2018, the Fund had invested approximately $30.4 million, net, in 79 portfolio companies. The weighted average yield of the investment portfolio based upon original cost, as of September 30, 2018, was 7.31% with an average duration of 1.04 years. The following graphics illustrate the Fund’s investment portfolio, as of September 30, 2018, by industry, geography, asset type, floating/fixed rate breakdown and investment structure:

STIRA ALCENTRA GLOBAL CREDIT FUND

NOTES TO SCHEDULE OF INVESTMENTS

September 30, 2018

(Unaudited)

Note 5. Concentration and Credit Risk

Investing in the Fund involves risks, including, but not limited to, those set forth below. The risks described below are not, and are not intended to be, a complete enumeration or explanation of the risks involved in an investment in the Fund. For a more complete discussion of the risks of investing in the Fund, see the section entitled “Types of Investments and Related Risks” in the Fund’s prospectus and the Fund’s other filings with the Securities and Exchange Commission (the “SEC”).

Credit Risk

The Fund’s debt investments are subject to the risk of non-payment of scheduled interest or principal by the borrowers with respect to such investments. Such non-payment would likely result in a reduction of income to the Fund and a reduction in the value of the debt investments experiencing non-payment.

Although the Fund may invest in investments that it believes are secured by specific collateral, the value of which may exceed the principal amount of the investments at the time of initial investment, there can be no assurance that the liquidation of any such collateral would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments with respect to such investment, or that such collateral could be readily liquidated. In addition, in the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing an investment. Under certain circumstances, collateral securing an investment may be released without the consent of the Fund. Moreover, the Fund’s investments in secured debt may be unperfected for a variety of reasons, including the failure to make required filings by lenders, trustees or other responsible parties and, as a result, the Fund may not have priority over other creditors as anticipated. The Fund’s right to payment and its security interest, if any, may be subordinated to the payment rights and security interests of more senior creditors. Certain of these investments may have an interest-only payment schedule, with the principal amount remaining outstanding and at risk until the maturity of the investment. In this case, a portfolio company’s ability to repay the principal of an investment may be dependent upon a liquidity event or the long-term success of the company, the occurrence of which is uncertain.

Companies in which the Fund invests could deteriorate as a result of, among other factors, an adverse development in their business, a change in the competitive environment or an economic downturn. As a result, companies that the Fund expected to be stable may operate, or expect to operate, at a loss or have significant variations in operating results, may require substantial additional capital to support their operations or maintain their competitive position, or may otherwise have a weak financial condition or be experiencing financial distress.

Foreign Currency Risk

Investments made by the Fund, and the income received by the Fund with respect to such investments, may be denominated in various non-U.S. currencies. However, the books of the Fund are maintained in U.S. dollars. Accordingly, changes in currency values may adversely affect the U.S. dollar value of portfolio investments, interest and other revenue streams received by the Fund, gains and losses realized on the sale of portfolio investments and the amount of distributions, if any, made by the Fund. In addition, the Fund may incur substantial costs in converting investment proceeds from one currency to another. The Fund may enter into derivative transactions designed to reduce such currency risks. Furthermore, the portfolio companies in which the Fund invests may be subject to risks relating to changes in currency values. If a portfolio company suffers adverse consequences as a result of such changes, the Fund may also be adversely affected as a result.

STIRA ALCENTRA GLOBAL CREDIT FUND

NOTES TO SCHEDULE OF INVESTMENTS

September 30, 2018

(Unaudited)

Liquidity Risk

The Fund may invest in securities that, at the time of investment, are illiquid, as determined by using the SEC’s standard applicable to registered investment companies (i.e., securities that cannot be disposed of by the Fund within seven days in the ordinary course of business at approximately the amount at which the Fund has valued the securities). The Fund may also invest in restricted securities. Investments in restricted securities could have the effect of increasing the amount of the Fund’s assets invested in illiquid securities if qualified institutional buyers are unwilling to purchase these securities.

Valuation Risk

The Fund is required to carry its investments at market value or, if no market value is ascertainable, at fair value as determined in good faith by the Board of Trustees. As part of the valuation process, the Board of Trustees may take into account the following types of factors, if relevant, in determining the fair value of the Fund’s investments:

When an external event such as a purchase transaction, public offering or subsequent equity sale occurs, the Fund will use the pricing indicated by the external event to corroborate its valuation. The Fund records decreases in the market values or fair values of its investments as unrealized depreciation. Declines in prices and liquidity in the corporate debt markets may result in significant net unrealized depreciation in the Fund’s portfolio. The effect of all of these factors on the Fund’s portfolio may reduce its net asset value by increasing net unrealized depreciation in its portfolio. Depending on market conditions, the Fund could incur substantial realized losses and may suffer additional unrealized losses in future periods, which could have a material adverse effect on its business, financial condition, results of operations and cash flows of the Fund.