Exhibit 4.1

    

    

    SECOND SUPPLEMENTAL INDENTURE

    

    

    between

    

    

    BLACKROCK TCP CAPITAL CORP.

    

    

    and

    

    

    U.S. BANK NATIONAL ASSOCIATION,

    

    

    as Trustee

    

    

    Dated as of August 23, 2019

    

    

    SECOND SUPPLEMENTAL INDENTURE

    

    

    THIS SECOND SUPPLEMENTAL INDENTURE (this “Second Supplemental Indenture”), dated as of August 23, 2019, is between BlackRock TCP Capital Corp., a Delaware corporation
      (the “Company”), and U.S. Bank National Association, as trustee (the “Trustee”). All capitalized terms used herein shall have the meaning set forth in the Base Indenture (as defined below) unless otherwise defined herein.

    

    

    RECITALS OF THE COMPANY

    

    

    The Company and the Trustee executed and delivered an Indenture, dated as of August 11, 2017 (the “Base Indenture” and, as supplemented by this Second Supplemental
      Indenture, together, the “Indenture”), to provide for the issuance by the Company from time to time of the Company’s unsecured debentures, notes or other evidences of indebtedness (the “Securities”), to be issued in one or more series
      as provided in the Indenture.

    

    

    The Company desires to issue and sell $150,000,000 aggregate principal amount of the Company’s 3.900% Notes due 2024 (the “Notes”).

    

    

    Sections 9.01(4) and 9.01(6) of the Base Indenture provide that without the consent of Holders of the Securities of any series issued under the Indenture, the Company, when
      authorized by or pursuant to a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures supplemental to the Base Indenture to (i) change or eliminate any of the provisions of the Indenture when there
      is no Security Outstanding of any series created prior to the execution of a supplemental indenture that is entitled to the benefit of such provision and (ii) establish the form or terms of Securities of any series as permitted by Section 2.01 and
      Section 3.01 of the Base Indenture.

    

    

    The Company desires to establish the form and terms of the Notes and to modify, alter, supplement and change certain provisions of the Base Indenture for the benefit of the
      Holders of the Notes (except as may be provided in a future supplemental indenture to the Indenture (“Future Supplemental Indenture”)).

    

    

    
      
         

      

      
        


      
        

        

      

    

    The Company has duly authorized the execution and delivery of this Second Supplemental Indenture to provide for the issuance of the Notes and all acts and things necessary to
      make this Second Supplemental Indenture a valid, binding, and legal obligation of the Company and to constitute a valid agreement of the Company, in accordance with its terms, have been done and performed.

    

    

    NOW, THEREFORE, THIS INDENTURE WITNESSETH:

    

    

    For and in consideration of the premises and the purchase of the Notes by the Holders thereof, it is mutually agreed, for the equal and proportionate benefit of all Holders
      of the Notes, as follows:

    

    

    ARTICLE I

    TERMS OF THE NOTES

    

    

    Section 1.01          Terms of the Notes.  The following terms relating to the Notes
        are hereby established:

    

    

    (a)          The Notes shall constitute a series of Securities having the title “3.900% Notes
        due 2024” and shall be designated as Senior Securities under the Indenture. The Notes shall bear a CUSIP number of 09259E AA6 and an ISIN number of US09259EAA64.

    

    

    (b)          The aggregate principal amount of the Notes that may be initially authenticated
        and delivered under the Indenture (except for Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other Notes pursuant to Sections 3.04, 3.05, 3.06, 9.06 or 11.07 of the Base Indenture) shall be
        $150,000,000. Under a Board Resolution, Officers’ Certificate pursuant to Board Resolutions or an indenture supplement, the Company may from time to time, without the consent of the Holders of Notes, issue additional Notes (in any such case “Additional
          Notes”) having the same ranking and the same interest rate, maturity, CUSIP number and other terms as the Notes; provided that such Additional Notes must be part of the same issue as the Notes for
        U.S. federal income tax purposes. Any Additional Notes and the existing Notes will constitute a single series under the Indenture and all references to the relevant Notes herein shall include the Additional Notes unless the context otherwise
        requires.

    

    

    (c)          The entire Outstanding principal amount of the Notes shall be payable on August
        23, 2024 (the “Stated Maturity”), unless earlier redeemed or repurchased in accordance with the provisions of this Second Supplemental Indenture.

    

    

    (d)          The rate at which the Notes shall bear interest shall be 3.900% per annum (the “Applicable
          Interest Rate”). The date from which interest shall accrue on the Notes shall be August 23, 2019, or the most recent Interest Payment Date to which interest has been paid or provided for; the Interest Payment Dates for the Notes shall be
        February 23 and August 23 of each year, commencing February 23, 2020 (if an Interest Payment Date falls on a day that is not a Business Day, then the applicable interest payment will be made on the next succeeding Business Day and no additional
        interest will accrue as a result of such delayed payment); the initial interest period will be the period from and including August 23, 2019 (or the most recent Interest Payment Date to which interest has been paid or provided for), to, but
        excluding, the initial Interest Payment Date, and the subsequent interest periods will be the periods from and including an Interest Payment Date to, but excluding, the next Interest Payment Date or the Stated Maturity, as the case may be; the
        interest so payable, and punctually paid or duly provided for, on any Interest Payment Date, will be paid to the Person in whose name the Note (or one or more predecessor Notes) is registered at the close of business on the Regular Record Date for
        such interest, which shall be February 9 and August 9 (whether or not a Business Day), as the case may be, immediately preceding such Interest Payment Date. Payment of principal of (and premium, if any) and any such interest on the Notes will be
        made at the Corporate Trust Office of the Trustee in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company,
        payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register. Interest on the Notes will be computed on the basis of a 360-day year of twelve 30-day months.

    

    

    
      
         

      

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    (e)          The Notes shall be initially issuable in global form (each such Note, a “Global
          Note”). The Global Notes and the Trustee’s certificate of authentication thereon shall be substantially in the form of Exhibit A to this Second Supplemental Indenture. Each Global Note shall represent the Outstanding Notes as shall be
        specified therein and each shall provide that it shall represent the aggregate amount of Outstanding Notes from time to time endorsed thereon and that the aggregate amount of Outstanding Notes represented thereby may from time to time be reduced or
        increased, as appropriate, to reflect exchanges and redemptions. Any endorsement of a Global Note to reflect the amount of any increase or decrease in the amount of Outstanding Notes represented thereby shall be made by the Trustee or the Security
        Registrar, in accordance with Sections 2.03 and 3.05 of the Base Indenture.

    

    

    (f)          The depositary for such Global Notes shall be the Depositary. The Security
        Registrar with respect to the Global Notes shall be the Trustee.

    

    

    (g)          The Notes shall be defeasible pursuant to Section 14.02 or Section 14.03 of the
        Base Indenture. Covenant defeasance contained in Section 14.03 of the Base Indenture shall apply to the covenants contained in Sections 10.06, 10.08 and 10.09 of the Indenture.

    

    

    (h)          The Notes shall be redeemable pursuant to Section 11.01 of the Base Indenture
        and as follows:

    

    

    (i)          The Notes will be redeemable, in whole or in part, at any
        time, or from time to time, at the option of the Company, at a Redemption Price equal to the greater of the following amounts, plus, in each case, accrued and unpaid interest to the Redemption Date:

    

    

    (a)          100% of the principal amount of the Notes to be redeemed, or

    

    

    (b)          the sum of the present values of the remaining scheduled
        payments of principal and interest (exclusive of accrued and unpaid interest to the Redemption Date) on the Notes to be redeemed, discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months)
        using the applicable Treasury Rate plus 45 basis points.

    

    

    
      
         

      

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    For purposes of calculating the Redemption Price in connection with the redemption of the Notes, on any Redemption Date, the following terms have the meanings set forth
      below:

    

    

    “Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the Comparable Treasury Issue
      (computed as of the third Business Day immediately preceding the redemption), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The
      Redemption Price and the Treasury Rate will be determined by the Company.

    

    

    “Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer as having a maturity comparable to the remaining term
      of the Notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financing practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Notes being
      redeemed.

    

    

    “Comparable Treasury Price” means (1) the average of the remaining Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest
      Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

    

    

    “Quotation Agent” means a Reference Treasury Dealer selected by the Company.

    

    

    “Reference Treasury Dealer” means BofA Securities, Inc. or its affiliates which are primary U.S. government securities dealers and their respective successors; provided, however, that if BofA Securities, Inc. or its affiliates shall cease to be a primary U.S. government securities dealer in the United States (a “Primary
        Treasury Dealer”), the Company shall select another Primary Treasury Dealer.

    

    

    “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation
      Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 3:30 p.m. New York time on the third
      Business Day preceding such Redemption Date.

    

    

    All determinations made by any Reference Treasury Dealer, including the Quotation Agent, with respect to determining the Redemption Price will be final and binding absent
      manifest error.

    

    

    (ii)          Notice of redemption shall be given in writing and mailed,
        first-class postage prepaid or by overnight courier guaranteeing next-day delivery, to each Holder of the Notes to be redeemed, not less than thirty (30) nor more than sixty (60) days prior to the Redemption Date, at the Holder’s address appearing
        in the Security Register. All notices of redemption shall contain the information set forth in Section 11.04 of the Base Indenture.

    

    

    
      
         

      

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    (iii)          Any exercise of the Company’s option to redeem the Notes
        will be done in compliance with the Investment Company Act, to the extent applicable.

    

    

    (iv)          If the Company elects to redeem only a portion of the Notes,
        the particular Notes to be redeemed will be selected in accordance with the applicable procedures of the Trustee and, so long as the Notes are registered to the Depositary or its nominee, the Depositary; provided,
        however, that no such partial redemption shall reduce the portion of the principal amount of a Note not redeemed to less than $2,000.

    

    

    (v)          Unless the Company defaults in payment of the Redemption
        Price, on and after the Redemption Date, interest will cease to accrue on the Notes called for redemption hereunder.

    

    

    (i)          The Notes shall not be subject to any sinking fund pursuant to Section 12.01 of
        the Base Indenture.

    

    

    (j)          The Notes shall be issuable in denominations of $2,000 and integral multiples of
        $1,000 in excess thereof.

    

    

    (k)          Holders of the Notes will not have the option to have the Notes repaid prior to
        the Stated Maturity other than in accordance with Article XIII of the Indenture.

    

    

    ARTICLE II

    DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

    

    

    Section 2.01          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Article One of the Base Indenture shall be amended by adding the following defined terms to Section 1.01 in
        appropriate alphabetical sequence, as follows:

    

    

    “Below Investment Grade Rating Event” means the Notes are downgraded below Investment Grade by the Rating Agency on any date from the date of the public notice of an
      arrangement that results in a Change of Control until the end of the 60-day period following public notice of the occurrence of a Change of Control (which period shall be extended so long as the rating of the Notes is under publicly announced
      consideration for possible downgrade by the Rating Agency); provided that a Below Investment Grade Rating Event otherwise arising by virtue of a particular reduction in rating shall not be deemed to have
      occurred in respect of a particular Change of Control (and thus shall not be deemed a Below Investment Grade Rating Event for purposes of the definition of Change of Control Repurchase Event hereunder) if the Rating Agency making the reduction in
      rating to which this definition would otherwise apply do not announce or publicly confirm or inform the Trustee in writing at its request that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as
      a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control shall have occurred at the time of the Below Investment Grade Rating Event).

    

    

    
      
         

      

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    “Change of Control” means the occurrence of any of the following:

    

    

    (1)          the direct or indirect sale, lease, transfer, conveyance or other disposition
        (other than by way of merger or consolidation) in one or a series of related transactions, of all or substantially all of the assets of the Company and its Controlled Subsidiaries taken as a whole to any “person” or “group” (as those terms are used
        in Section 13(d)(3) of the Exchange Act), other than to any Permitted Holders; provided that, for the avoidance of doubt, a pledge of assets pursuant to any secured debt instrument of the Company or its
        Controlled Subsidiaries shall not be deemed to be any such sale, lease, transfer, conveyance or disposition;

    

    

    (2)          the consummation of any transaction (including, without limitation, any merger
        or consolidation) the result of which is that any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) (other than any Permitted Holders) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the
        Exchange Act), directly or indirectly, of more than 50% of the outstanding Voting Stock of the Company, measured by voting power rather than number of shares; or

    

    

    (3)          the approval by the Company’s stockholders of any plan or proposal relating to
        the liquidation or dissolution of the Company.

    

    

    “Change of Control Repurchase Event” means the occurrence of a Change of Control and a Below Investment Grade Rating Event.

    

    

    “Controlled Subsidiary” means any Subsidiary of the Company, 50% or more of the outstanding equity interests of which are owned by the Company and its direct or
      indirect Subsidiaries and of which the Company possesses, directly or indirectly, the power to direct or cause the direction of the management or policies, whether through the ownership of voting equity interests, by agreement or otherwise.

    

    

    “Depositary” means, with respect to each Note in global form, The Depository Trust Company, until a successor shall have been appointed and becomes such person, and
      thereafter, Depositary shall mean or include such successor.

    

    

    “Exchange Act” means the Securities Exchange Act of 1934, as amended, and any statute successor thereto, in each case as amended from time to time and the rules and
      regulations of the Commission promulgated thereunder.

    

    

    “GAAP” means generally accepted accounting principles in the United States set forth in the opinions and pronouncements of the Accounting Principles Board of the
      American Institute of Certified Public Accountants, the opinions and pronouncements of the Public Company Accounting Oversight Board and the statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such
      other entity as have been approved by a significant segment of the accounting profession in the United States, which are in effect from time to time.

    

    

    “Investment Company Act” means the Investment Company Act of 1940, as amended, and the rules, regulations and interpretations promulgated thereunder, to the extent
      applicable, and any statute successor thereto.

    

    

    
      
         

      

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    “Investment Grade” means a rating of BBB- or better by S&P (or its equivalent under any successor rating categories of S&P) (or, if S&P ceases to rate the
      Notes for reasons outside of the Company’s control, the equivalent investment grade credit rating from any Rating Agency selected by the Company as a replacement Rating Agency).

    

    

    “Permitted Holders” means (i) the Company, (ii) one or more of the Company’s Controlled Subsidiaries and (iii) Tennenbaum Capital Partners, LLC or any Affiliate of
      Tennenbaum Capital Partners, LLC that is organized under the laws of a jurisdiction located in the United States of America and in the business of managing or advising clients.

    

    

    “Rating Agency” means (1) S&P; and (2) if S&P ceases to rate the Notes or fails to make a rating of the Notes publicly available for reasons outside of the
      Company’s control, a “nationally recognized statistical rating organization” as defined in Section 3(a)(62) of the Exchange Act selected by the Company as a replacement agency for S&P.

    

    

    “S&P” means Standard & Poor’s Ratings Services, a division of McGraw-Hill, Inc., or any successor thereto.

    

    

    “Significant Subsidiary” means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X under the Exchange Act, as
      such regulation is in effect on the date of this Indenture (but excluding any Subsidiary which is (a) a non-recourse or limited recourse Subsidiary, (b) a bankruptcy remote special purpose vehicle or (c) is not consolidated with the Company for
      purposes of GAAP).

    

    

    “Voting Stock” as applied to stock of any Person, means shares, interests, participations or other equivalents in the equity interest (however designated) in such
      Person having ordinary voting power for the election of a majority of the directors (or the equivalent) of such Person, other than shares, interests, participations or other equivalents having such power only by reason of the occurrence of a
      contingency.

    

    

    Section 2.02          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Article One of the Base Indenture shall be amended by amending the definition of “Subsidiary” in
        Section 1.01 to add the following sentence at the end of such definition:

    

    

    “In addition, for purposes of this definition, “Subsidiary” shall exclude any investments held by the Company in the ordinary course of business which are not, under GAAP,
      consolidated on the financial statements of the Company and its Subsidiaries.”

    

    

    ARTICLE III

    SECURITIES FORMS

    

    

    Section 3.01          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Article Two of the Base Indenture shall be amended by adding the following new Section 2.04 thereto, as set
        forth below:

    

    

    
      
         

      

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    “Section 2.04. Certificated Notes. Notwithstanding anything to the contrary in the Indenture, Notes in physical, certificated form will be issued and delivered to each person
      that the Depositary identifies as a beneficial owner of the related Notes only if:

    

    

    (a)          the Depositary notifies the Company at any time that it is unwilling or unable
        to continue as depositary for the Notes in global form and a successor depositary is not appointed within 90 days;

    

    

    (b)          the Depositary ceases to be registered as a clearing agency under the Exchange
        Act and a successor depositary is not appointed within 90 days; or

    

    

    (c)          an Event of Default with respect to the Notes has occurred and is continuing and
        such beneficial owner requests that its Notes be issued in physical, certificated form.”

    

    

    ARTICLE IV

    REMEDIES

    

    

    Section 4.01          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Section 5.01 of the Base Indenture shall be amended by replacing clause (ii) thereof with the following:

    

    

    “(ii) default in the payment of the principal of (or premium, if any) any Note when it becomes due and payable at its Maturity, including upon any Redemption Date or required
      repurchase date; or”

    

    

    Section 4.02          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Section 5.01 of the Base Indenture shall be amended by replacing (iv) thereof with the following:

    

    

    
      
        	

              	“(iv)	
                the Company’s failure for 60 consecutive days after written notice from the Trustee or the Holders of at least 25% in principal amount of the Notes then Outstanding has been
                  received to comply with any of the Company’s other agreements contained in the Notes or this Indenture;”

              


      

    

    

    

    Section 4.03          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Section 5.01 of the Base Indenture shall be amended by adding the following language as clause (ix):

    

    

    
      
        	

              	“(ix):	
                default by the Company or any of its Significant Subsidiaries, with respect to any mortgage, agreement or other instrument under which there may be outstanding, or by which there
                  may be secured or evidenced, any indebtedness for money borrowed in excess of $50 million in the aggregate of the Company and/or any such Significant Subsidiary, whether such indebtedness now exists or shall hereafter be created (i)
                  resulting in such indebtedness becoming or being declared due and payable or (ii) constituting a failure to pay the principal or interest of any such debt when due and payable at its stated maturity, upon required repurchase, upon
                  declaration of acceleration or otherwise, unless, in either case, such indebtedness is discharged, or such acceleration is rescinded, stayed or annulled, within a period of 30 calendar days after written notice of such failure is given to
                  the Company by the Trustee or to the Company and the Trustee by the Holders of at least 25% in aggregate principal amount of the Notes then Outstanding.”

              


      

    

    

    

    
      
         

      

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    Section 4.04          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Section 5.02 of the Base Indenture shall be amended by replacing the first paragraph of Section 5.02 with
        the following:

    

    

    “If an Event of Default with respect to the Notes occurs and is continuing, then and in every such case (other than an Event of Default specified in Section 5.01(v) or
      5.01(vi)), the Trustee or the Holders of not less than 25% in principal amount of the Outstanding Notes may declare the principal of all the Outstanding Notes to be due and payable immediately, by a notice in writing to the Company (and to the
      Trustee if given by the Holders), and upon any such declaration such principal shall become immediately due and payable; provided that 100% of the principal of, and accrued and unpaid interest on, the Notes
      will automatically become due and payable in the case of an Event of Default specified in Section 5.01(v) or 5.01(vi) hereof.

    

    

    Section 4.05          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Section 5.12 of the Base Indenture shall be amended by replacing clause (iii) thereof with the following:

    

    

    “the Trustee need not take any action that it determines in good faith may involve it in personal liability or be unjustly prejudicial to the Holders of Notes not
      consenting.”

    

    

    ARTICLE V

    COVENANTS

    

    

    Section 5.01          Except as may be provided in a Future Supplemental Indenture, for the
        benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now or hereafter issued and Outstanding, Article Ten of the Base Indenture shall be amended by adding the following new Sections 10.08, and 10.09
        thereto, each as set forth below:

    

    

    “Section 10.08 Section 18(a)(1)(A) of the Investment Company Act.

    

    

    The Company hereby agrees that for the period of time during which Notes are Outstanding, the Company will not violate, whether or not it is subject to, Section 18(a)(1)(A)
      as modified by Section 61(a)(1) of the Investment Company Act or any successor provisions thereto of the Investment Company Act, giving effect to any exemptive relief granted to the Company by the Commission.”

    

    

    
      
         

      

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    “Section 10.09 Commission Reports and Reports to Holders.

    

    

    If, at any time, the Company is not subject to the reporting requirements of Sections 13 or 15(d) of the Exchange Act to file any periodic reports with the Commission, the
      Company agrees to furnish to the Holders of Notes and the Trustee for the period of time during which the Notes are Outstanding: (i) within 90 days after the end of the each fiscal year of the Company, audited annual consolidated financial statements
      of the Company and (ii) within 45 days after the end of each fiscal quarter of the Company (other than the Company’s fourth fiscal quarter), unaudited interim consolidated financial statements of the Company. All such financial statements shall be
      prepared, in all material respects, in accordance with GAAP, as applicable.”

    

    

    ARTICLE VI

    SUCCESSOR COMPANIES

    

    

    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now
      or hereafter issued and Outstanding, Article Eight of the Base Indenture shall be amended by replacing Section 8.01 with the following:

    

    

    “Section 8.01 Merger, Consolidation or Sale of Assets.

    

    

    The Company shall not merge or consolidate with or into any other Person (other than a merger of a wholly owned Subsidiary of the Company into the Company) or sell, transfer,
      lease, convey or otherwise dispose of all or substantially all of its property (provided that, for the avoidance of doubt, a pledge of assets pursuant to any secured debt instrument of the Company or its
      Controlled Subsidiaries shall not be deemed to be any such sale, transfer, lease, conveyance or disposition) in one transaction or series of related transactions unless:

    

    

    (a)          the Company shall be the surviving Person (the “Surviving Person”) or the
        Surviving Person (if other than the Company) formed by such merger or consolidation or to which such sale, transfer, lease, conveyance or disposition is made shall be a corporation or limited liability company organized and existing under the laws
        of the United States of America or any state or territory thereof;

    

    

    (b)          the Surviving Person (if other than the Company) expressly assumes, by
        supplemental indenture in form reasonably satisfactory to the Trustee, executed and delivered to the Trustee by such Surviving Person, the due and punctual payment of the principal of, and premium, if any, and interest on, all the Notes
        Outstanding, and the due and punctual performance and observance of all the covenants and conditions of this Indenture to be performed by the Company;

    

    

    (c)          immediately before and immediately after giving effect to such transaction or
        series of related transactions, no Default or Event of Default shall have occurred and be continuing; and

    

    

    (d)          the Company shall deliver, or cause to be delivered, to the Trustee, an
        Officers’ Certificate and an Opinion of Counsel, each stating that such transaction and the supplemental indenture, if any, in respect thereto comply with this Section 8.01 and that all conditions precedent in this Indenture relating to such
        transaction have been complied with.

    

    

    
      
         

      

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    For the purposes of this Section 8.01, the sale, transfer, lease, conveyance or other disposition of all the property of one or more Subsidiaries of the Company, which
      property, if held by the Company instead of such Subsidiaries, would constitute all or substantially all the property of the Company on a consolidated basis, shall be deemed to be the transfer of all or substantially all the property of the Company.”

    

    

    ARTICLE VII

    OFFER TO REPURCHASE UPON A CHANGE OF CONTROL REPURCHASE EVENT

    

    

    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Indenture, whether now
      or hereafter issued and Outstanding, Article Thirteen of the Base Indenture shall be amended by replacing Sections 13.01 to 13.05 with the following:

    

    

    “Section 13.01 Change of Control.

    

    

    If a Change of Control Repurchase Event occurs, unless the Company shall have exercised its right to redeem the Notes in full, the Company shall make an offer to each Holder
      of the Notes to repurchase all or any part (in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof) of that Holder’s Notes at a repurchase price in cash equal to 100% of the aggregate principal amount of Notes
      repurchased plus any accrued and unpaid interest on the Notes repurchased to the date of purchase. Within 30 days following any Change of Control Repurchase Event or, at the Company’s option, prior to any Change of Control, but after the public
      announcement of the Change of Control, the Company will mail a notice to each Holder describing the transaction or transactions that constitute or may constitute the Change of Control Repurchase Event and offering to repurchase Notes on the payment
      date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed. The notice shall, if mailed prior to the date of consummation of the Change of Control, state that the offer to
      purchase is conditioned on the Change of Control Repurchase Event occurring on or prior to the payment date specified in the notice. The Company shall comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and
      regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Repurchase Event.

    

    

    To the extent that the provisions of any securities laws or regulations conflict with this Section 13.01, the Company shall comply with the applicable securities laws and
      regulations and shall not be deemed to have breached its obligations under this Section 13.01 by virtue of such conflict.

    

    

    On the Change of Control Repurchase Event payment date, subject to extension if necessary to comply with the provisions of the Investment Company Act, the Company shall, to
      the extent lawful:

    

    

    (1)          accept for payment all Notes or portions of Notes properly tendered pursuant to
        its offer;

    

    

    
      
         

      

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    (2)          deposit with the Paying Agent an amount equal to the aggregate purchase price in
        respect of all Notes or portions of Notes properly tendered; and

    

    

    (3)          deliver or cause to be delivered to the Trustee the Notes properly accepted,
        together with an Officers’ Certificate stating the aggregate principal amount of Notes being purchased by the Company.

    

    

    The Paying Agent will promptly remit to each Holder of Notes properly tendered the purchase price for the Notes, and the Trustee will promptly authenticate and mail (or cause
      to be transferred by book-entry) to each Holder a new Note equal in principal amount to any unpurchased portion of any Notes surrendered; provided that each new Note will be in a minimum principal amount of
      $2,000 or an integral multiple of $1,000 in excess thereof.

    

    

    If any Repayment Date upon a Change of Control Repurchase Event falls on a day that is not a Business Day, then the required payment will be made on the next succeeding
      Business Day and no additional interest will accrue as a result of such delayed payment.

    

    

    The Company will not be required to make an offer to repurchase the Notes upon a Change of Control Repurchase Event if a third party makes an offer in respect of the Notes in
      the manner, at the time and otherwise in compliance with the requirements for an offer made by the Company and such third party purchases all Notes properly tendered and not withdrawn under its offer.”

    

    

    ARTICLE VIII

    MISCELLANEOUS

    

    

    Section 8.01          This Second Supplemental Indenture and the Notes shall be governed by
        and construed in accordance with the laws of the State of New York, without regard to principles of conflicts of laws that would cause the application of laws of another jurisdiction. This Second Supplemental Indenture is subject to the provisions
        of the Trust Indenture Act that are required to be part of the Indenture and shall, to the extent applicable, be governed by such provisions. If any provision of the Indenture limits, qualifies or conflicts with the duties imposed by Section 318(c)
        of the Trust Indenture Act, the imposed duties will control.

    

    

    Section 8.02          In case any provision in this Second Supplemental Indenture or in the
        Notes shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

    

    

    Section 8.03          This Second Supplemental Indenture may be executed in any number of
        counterparts, each of which will be an original, but such counterparts will together constitute but one and the same Second Supplemental Indenture. The exchange of copies of this Second Supplemental Indenture and of signature pages by facsimile,
        .pdf transmission, email or other electronic means shall constitute effective execution and delivery of this Second Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile, .pdf transmission, email or
        other electronic means shall be deemed to be their original signatures for all purposes.

    

    

    
      
         

      

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    Section 8.04          The Base Indenture, as supplemented and amended by this Second
        Supplemental Indenture, is in all respects ratified and confirmed, and the Base Indenture and this Second Supplemental Indenture shall be read, taken and construed as one and the same instrument with respect to the Notes. All provisions included in
        this Second Supplemental Indenture supersede any conflicting provisions included in the Base Indenture with respect to the Notes, unless not permitted by law. The Trustee accepts the trusts created by the Indenture, as supplemented by this Second
        Supplemental Indenture, and agrees to perform the same upon the terms and conditions of the Indenture, as supplemented by this Second Supplemental Indenture.

    

    

    Section 8.05          The provisions of this Second Supplemental Indenture shall become
        effective as of the date hereof.

    

    

    Section 8.06          Notwithstanding anything else to the contrary herein, the terms and
        provisions of this Second Supplemental Indenture shall apply only to the Notes and shall not apply to any other series of Securities under the Indenture and this Second Supplemental Indenture shall not and does not otherwise affect, modify, alter,
        supplement or change the terms and provisions of any other series of Securities under the Indenture, whether now or hereafter issued and Outstanding.

    

    

    Section 8.07          The recitals contained herein and in the Notes shall be taken as the
        statements of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this Second Supplemental Indenture, the Notes or any Additional Notes, except that
        the Trustee represents that it is duly authorized to execute and deliver this Second Supplemental Indenture, authenticate the Notes and any Additional Notes and perform its obligations hereunder. The Trustee shall not be accountable for the use or
        application by the Company of the Notes or any Additional Notes or the proceeds thereof. The rights, protections, indemnities and immunities of the Trustee and its agents as enumerated under the Base Indenture are incorporated by reference into
        this Second Supplemental Indenture.

    

    

    
      
         

      

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    IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be duly executed as of the date first above written.

    

    

    	 	
            BLACKROCK TCP CAPITAL CORP.

          
	 	 	 
	 	
            By:

          	
            /s/ Howard M. Levkowitz

          
	 	 	
            Name: Howard M. Levkowitz

          
	 	 	
            Title: Chief Executive Officer

          
	 	 	 
	 	
            U.S. BANK NATIONAL ASSOCIATION,

          
	 	
            as Trustee

          
	 	 	 
	 	
            By:

          	
            /s/ Beverly A. Freeney

          
	 	 	
            Name: Beverly A. Freeney

          
	 	 	
            Title: Vice President

          


    

    

    
      [Signature Page to Second Supplemental Indenture]

    

    
      
         

      

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    Exhibit A – Form of Global Note

    

    

    This Security is a Global Note within the meaning of the Indenture hereinafter referred to and is registered in the name of The Depository Trust Company or a nominee thereof.
      This Security may not be exchanged in whole or in part for a Security registered, and no transfer of this Security in whole or in part may be registered, in the name of any Person other than The Depository Trust Company or a nominee thereof, except
      in the limited circumstances described in the Indenture.

    

    

    Unless this certificate is presented by an authorized representative of The Depository Trust Company to the issuer or its agent for registration of
      transfer, exchange or payment and such certificate issued in exchange for this certificate is registered in the name of Cede & Co., or such other name as requested by an authorized representative of The Depository Trust Company, any transfer,
      pledge or other use hereof for value or otherwise by or to any person is wrongful, as the registered owner hereof, Cede & Co., has an interest herein.

    

    

    BlackRock TCP Capital Corp.

    

    

    	
            No. ___

          	
            

            

          	$____________
	 	
            

            

            

            

          	CUSIP No. 09259E AA6
	ISIN No. US09259EAA64


    

    

    3.900% Notes due 2024

    

    

    BlackRock TCP Capital Corp., a corporation duly organized and existing under the laws of Delaware (herein called the “Company”, which term includes any successor
      Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of _________________ (U.S. $___) on August 23, 2024, and to pay interest thereon from August
      23, 2019 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi¬annually on February 23 and August 23 in each year, commencing February 23, 2020, at the rate of 3.900% per annum, until the principal
      hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security is registered at the
      close of business on the Regular Record Date for such interest, which shall be February 9 and August 9 (whether or not a Business Day), as the case may be, immediately preceding such Interest Payment Date. Any such interest not so punctually paid or
      duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security is registered at the close of business on a Special Record Date for the payment of such
      Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the
      requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture. This Security may be issued as part of a series.

    

    

    
      
         

      

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    Payment of the principal of (and premium, if any) and any such interest on this Security will be made at the Corporate Trust Office of the Trustee in such coin or currency of
      the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company payment of interest may be made by check mailed to the address of the Person entitled
      thereto as such address shall appear in the Security Register.

    

    

    Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as
      if set forth at this place.

    

    

    Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to
      any benefit under the Indenture or be valid or obligatory for any purpose.

    

    

    
      
         

      

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    IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed.

    

    

    Dated:___________

    

    

    	 	
            BLACKROCK TCP CAPITAL CORP.

          
	 	 	 
	 	
            By:

          	 
	 	 	
            Name:

          
	 	 	
            Title:

          


    

    

    
      
         

      

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    This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

    

    

    Dated:___________

    

    

    	 	
            U.S. BANK NATIONAL ASSOCIATION,

            as Trustee

          
	 	 	 
	 	
            By:

          	 
	 	 	
            Authorized Signatory

          


    

    

    
      
         

      

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    BlackRock TCP Capital Corp.

    

    

    3.900% Notes due 2024

    

    

    This Security is one of a duly authorized issue of securities of the Company (herein called the “Securities”), issued and to be issued in one or more series under an
      Indenture, dated as of August 11, 2017 (herein called the “Base Indenture”, which term shall have the meaning assigned to it in such instrument), between the Company and U.S. Bank National Association, as Trustee (herein called the “Trustee”,
      which term includes any successor trustee under the Base Indenture), and reference is hereby made to the Base Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee, and
      the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered, as supplemented by the Second Supplemental Indenture, relating to the Securities, dated as of August 23, 2019, by and between
      the Company and the Trustee (herein called the “Second Supplemental Indenture”; and the Second Supplemental Indenture and the Base Indenture together are herein called the “Indenture”). In the event of any conflict between the Base
      Indenture and the Second Supplemental Indenture, the Second Supplemental Indenture shall govern and control.

    

    

    This Security is one of the series designated on the face hereof, initially limited in aggregate principal amount to $150,000,000. Under a Board Resolution, Officers’
      Certificate pursuant to Board Resolutions or an indenture supplement, the Company may from time to time, without the consent of the Holders of Securities, issue additional Securities of this series (in any such case “Additional Securities”)
      having the same ranking and the same interest rate, maturity, CUSIP number and other terms as the Securities, provided that such Additional Securities must be part of the same issue as the Securities for U.S.
      federal income tax purposes. Any Additional Securities and the existing Securities will constitute a single series under the Indenture and all references to the relevant Securities herein shall include the Additional Securities unless the context
      otherwise requires. The aggregate amount of Outstanding Securities represented hereby may from time to time be reduced or increased, as appropriate, to reflect exchanges and redemptions.

    

    

    The Securities of this series are subject to redemption in whole or in part at any time or from time to time, at the option of the Company, at a Redemption Price equal to the
      greater of the following amounts, plus, in each case, accrued and unpaid interest to the Redemption Date:

    

    

    
      
        	

              	(a)	
                100% of the principal amount of the Securities to be redeemed, or

              


      

    

    

    

    
      
        	

              	(b)	
                the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the Redemption Date) on the Securities to be
                  redeemed, discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 45 basis points.

              


      

    

    

    

    
      
         

      

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    For purposes of calculating the Redemption Price in connection with the redemption of the Securities, on any Redemption Date, the following terms have the meanings set forth
      below:

    

    

    “Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the Comparable Treasury Issue
      (computed as of the third Business Day immediately preceding the redemption), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The
      Redemption Price and the Treasury Rate will be determined by the Company.

    

    

    “Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer as having a maturity comparable to the remaining term
      of the Securities to be redeemed that would be utilized, at the time of selection and in accordance with customary financing practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Securities
      being redeemed.

    

    

    “Comparable Treasury Price” means (1) the average of the remaining Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest
      Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

    

    

    “Quotation Agent” means a Reference Treasury Dealer selected by the Company.

    

    

    “Reference Treasury Dealer” means BofA Securities, Inc. and its affiliates which are primary U.S. government securities dealers and their respective successors;
      provided, however, that if BofA Securities, Inc. or its affiliates shall cease to be a primary U.S. government securities dealer in the United States (a “Primary Treasury Dealer”), the Company shall select another Primary Treasury Dealer.

    

    

    “Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation
      Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 3:30 p.m. New York time on the third
      Business Day preceding such Redemption Date.

    

    

    All determinations made by any Reference Treasury Dealer, including the Quotation Agent, with respect to determining the Redemption Price will be final and binding absent
      manifest error.

    

    

    Notice of redemption shall be given in writing and mailed, first-class postage prepaid or by overnight courier guaranteeing next-day delivery, to each Holder of the
      Securities to be redeemed, not less than thirty (30) nor more than sixty (60) days prior to the Redemption Date, at the Holder’s address appearing in the Security Register. All notices of redemption shall contain the information set forth in Section
      11.04 of the Base Indenture.

    

    

    Any exercise of the Company’s option to redeem the Securities will be done in compliance with the Investment Company Act, to the extent applicable.

    

    

    If the Company elects to redeem only a portion of the Securities, the particular Securities to be redeemed will be selected in accordance with the applicable procedures of
      the Trustee and, so long as the Securities are registered to the Depositary or its nominee, the Depositary. In the event of redemption of this Security in part only, a new Security or Securities of this series and of like tenor for the unredeemed
      portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof; provided, however, that no such partial redemption shall reduce the
      portion of the principal amount of a Security not redeemed to less than $2,000.

    

    

    
      
         

      

      20

      
        


      
        

        

      

    

    Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Securities called for redemption.

    

    

    Holders will have the right to require the Company to repurchase their Securities upon the occurrence of a Change of Control Repurchase Event as set forth in the Indenture.

    

    

    The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Security or certain restrictive covenants and Events of Default with respect
      to this Security, in each case upon compliance with certain conditions set forth in the Indenture.

    

    

    If an Event of Default with respect to Securities of this series shall occur and be continuing (other than Events of Default related to certain events of bankruptcy,
      insolvency or reorganization as set forth in the Indenture), the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided in the Indenture. In the case of certain events of bankruptcy,
      insolvency or reorganization described in the Indenture, 100% of the principal of and accrued and unpaid interest on the Securities will automatically become due and payable.

    

    

    The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of
      the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of
      each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such
      series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon
      such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

    

    

    As provided in and subject to the provisions of the Indenture, the Holder of this Security shall not have the right to institute any proceeding with respect to the Indenture
      or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Securities of this series, the Holders
      of not less than 25% in principal amount of the Securities of this series at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee
      reasonable indemnity against the costs, expenses and liabilities to be incurred in compliance with such request, and the Trustee shall not have received from the Holders of a majority in principal amount of Securities of this series at the time
      Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for sixty (60) days after receipt of such notice, request and offer of indemnity. The foregoing shall not apply to any suit instituted by
      the Holder of this Security for the enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein.

    

    

    
      
         

      

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    No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is absolute and
      unconditional, to pay the principal of and any premium and interest on this Security at the times, place and rate, and in the coin or currency, herein prescribed.

    

    

    As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of
      this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable, duly endorsed by, or accompanied by a written instrument of transfer in
      form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for
      the same aggregate principal amount, will be issued to the designated transferee or transferees.

    

    

    The Securities of this series are issuable only in registered form without coupons in denominations of $2,000 and any integral multiples of $1,000 in excess thereof. As
      provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination, as
      requested by the Holder surrendering the same.

    

    

    No service charge shall be made for any such registration of transfer or exchange, but the Company or Trustee may require payment of a sum sufficient to cover any tax or
      other governmental charge payable in connection therewith.

    

    

    Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose
      name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

    

    

    All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

    

    

    To the extent any provision of this Security conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling.

    

    

    The Indenture and this Security shall be governed by and construed in accordance with the laws of the State of New York, without regard to principles of conflicts of laws
      that would cause the application of laws of another jurisdiction.

    

    

    
       

    

  

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