Document:

Exhibit 4.30

      

       

      

      NEITHER THE SECURITIES REPRESENTED BY THIS NOTE NOR THE SECURITIES ISSUABLE UPON THE CONVERSION OF THIS NOTE HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR ANY STATE
        SECURITIES LAWS, AND NEITHER SUCH SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, ASSIGNED OR OTHERWISE TRANSFERRED UNLESS (1) A REGISTRATION STATEMENT WITH RESPECT THERETO IS EFFECTIVE UNDER THE ACT AND ANY APPLICABLE STATE SECURITIES
        LAWS, OR (2) AN EXEMPTION FROM SUCH REGISTRATION EXISTS AND THE MAKER RECEIVES AN OPINION OF COUNSEL TO THE HOLDER OF SUCH SECURITIES, WHICH COUNSEL AND OPINION ARE SATISFACTORY TO THE COMPANY, THAT SUCH SECURITIES MAY BE OFFERED, SOLD, PLEDGED,
        ASSIGNED OR TRANSFERRED IN THE MANNER CONTEMPLATED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.

      

      

      AMENDMENT No. 4 TO CONVERTIBLE PROMISSORY NOTE

      

      

      	
              $4,000,000

            	
              Athens, Greece

            
	 	
              May 29, 2019

            

       

      

      This amendment (this “Amendment No. 4”) to a Convertible Promissory Note dated as of March 12, 2015, as amended by Amendment No. 1 dated as of May 14,
        2015, as further amended by Amendment No. 2 dated as of September 18, 2017 and as further amended by Amendment No. 3 dated as of March 26, 2019, is entered into by and between Seanergy Maritime Holdings Corp., a corporation organized under the laws
        of the Republic of the Marshall Islands, (the “Maker”), and investor set forth in Schedule 1 attached hereto, or its respective registered assigns (the “Holder”).

      

      

      BACKGROUND

      

      

      WHEREAS, on March 12, 2015 the Maker executed a promissory note in the principal amount of USD$4,000,000 in
          favour of the Holder (the “Initial Note”);

      

      

      WHEREAS, on May 14, 2015, on September 18, 2017 and on March 26, 2019, the parties entered into Amendment No.
          1, Amendment No. 2 and Amendment No. 3 respectively, pursuant to which certain sections of the Initial Note were amended and restated (the Initial Note, as amended by Amendment No. 1, Amendment No. 2 and Amendment No. 3, the “Promissory Note”);

      

      

      WHEREAS, in exchange for, among other things, the full and final settlement of unpaid interest in the amount of
          $155,090.79 accrued under the Promissory Note until March 31, 2019 and the neutralization of the Promissory Note’s interest rate for the period from April 1, 2019 until December 31, 2019, the Maker issued to the Holder 1,823,529 units of the
          Maker, each unit consisting of (i) one common share, par value $0.0001 per share (a “Common Share”) of the Maker, (ii) one Class B Warrant of the Maker to purchase a Common Share, and (iii) one Class C Warrant of the Maker to purchase a Common
          Share, for $3.40 per unit, pursuant to the terms of a Securities Purchase Agreement dated as of May 9, 2019 made between the Maker and the Holder;

      

      

      
        
          

      

      
      WHEREAS, each of the parties hereto wishes to amend the interest section of the Promissory Note, as described
          in detail below; and

       

        

      NOW THEREFORE, in consideration of the foregoing and for other consideration the receipt and sufficiency of
          which is hereby acknowledged, the parties hereto intending to be legally bound hereby agree as follows:

      

      

      AGREEMENT

      

      

      1. Section 3 of the Promissory Note is hereby deleted in its entirety and replaced with the following:

      

      

      “3.           Interest. The Maker shall pay interest on the principal amount of this Note, which shall accrue: (i) from 1 April 2019 through 31 December
        2019 (inclusive), at a rate of 0% per annum, and (ii) from 1 January 2020 through the Maturity Date, at a rate equal to the aggregate of (a) 5% per annum and (b) the three (3) month London Interbank Offered Rate for deposits in Dollars determined
        at or about 11.00 a.m. (London time) two business days prior to the first day of each interest period (the “Interest Rate”). Interest shall be payable to the Holder quarterly with the last interest payment falling due for payment on the Maturity
        Date. In the event of a failure by the Maker to pay any amount on the date on which such amount is due and payable pursuant to this Note and irrespective of any notice by the Holder or any other person to the Maker in respect of such failure, the
        Maker shall pay interest on such amount on demand from the date of such default up to the date of actual payment at the per annum rate which is the aggregate of: (a) two point fifty per cent (2.50%); and (b) the Interest Rate.”

       

      2. The term “this Note” as used in the Promissory Note shall be read and construed as reference to the
          Promissory Note, as amended hereby.

      

      

      3. The parties hereto acknowledge and confirm that other than as amended herein, the Promissory Note shall
          remain in full force and effect and shall continue to evidence, guarantee and support their respective obligations.

      

      

      4. Maker’s Representations and Warranties: the Maker hereby warrants and represents to the Holder as follows:

      

      

      (a) To the best of Maker's knowledge and belief, after giving effect to this Amendment No. 4, no default has occurred under the Promissory Note nor has any event occurred or failed to occur which,
        with the passage of time or the giving of notice or both, would comprise such a default;

       

      (b) There are no counterclaims or defenses against the indebtedness evidenced by the Note, as modified hereby;

       

      (c) The Maker has full power, authority and legal right to execute this Amendment No. 4 and to keep and observe all of the terms of this Amendment No. 4 to be observed or performed by the Maker;
        and

       

      
        2

        
          

      

      (d) There are no actions, suits or proceedings pending or, to the knowledge of Maker, threatened against or affecting the Maker or involving the validity or enforceability of the Promissory Note,
        at law or in equity, and the Maker is not operating under, or subject to, or in default of, or in violation with respect to, any order, writ, injunction, decree or demand of any court or any governmental authorities.

      

      

      5. Holder’s Representations and Warranties: the Holder hereby warrants and represents to the Maker that the
          Holder has full power, authority and legal right to execute this Amendment No. 4 and to keep and observe all of the terms of this Amendment No. 4 to be observed or performed by the Holder.

      

      

      6. This Amendment No. 4 may be executed by the parties hereto in separate counterparts, each of which, when so
          executed and delivered, shall be an original, but all such counterparts shall together constitute on and the same instrument. All such counterparts may be delivered among the parties hereto by facsimile or other electronic transmission, which
          shall not affect the validity thereof.

      

      

      7. This Amendment No. 4 shall be governed by and construed in accordance with the internal laws of the State of
          New York (without reference to the conflicts of law provisions thereof). Any dispute regarding this Amendment No. 4 shall be exclusively referred to arbitration in London and conducted in accordance with the Arbitration Act 1996 (England and
          Wales) or any statutory modification or re-enactment thereof, and the parties agree to submit to the personal and exclusive jurisdiction and venue of such arbitrators. Any and all disputes hereunder shall be referred by the parties hereto to
          three arbitrators, each party to appoint one arbitrator and the two so appointed shall appoint the third who shall act as chairman of such panel of arbitrators.  Upon receipt by one party of the nomination in writing of such other party’s
          arbitrator, that party shall appoint its arbitrator within ten days, failing which the decision of the single arbitrator appointed shall apply. The two arbitrators so appointed shall appoint the third arbitrator within ten days, failing which the
          third arbitrator shall be appointed by the President of the London Maritime Arbitrators Association (“LMAA”) at the time within twenty-one days of the two arbitrators being appointed. The arbitration shall be conducted in accordance with
          the terms of the LMAA then in effect.  The parties agree that any tribunal constituted under this Amendment No. 4 shall have the power to order consolidation of proceedings or concurrent hearings in relation to any and all disputes arising out of
          or in connection with the Promissory Note or the other documents contemplated thereby, which involve common questions of fact or law, and to make any orders ancillary to the same, including, without limitation, any orders relating to the
          procedures to be followed by the parties in any such consolidated proceedings or concurrent hearings. Consolidated disputes are to be heard by a maximum of three arbitrators, each party to have the right to appoint one arbitrator. In case a
          dispute arises as to whether consolidation is appropriate (including without limitation conflicting orders of relevant tribunals) and/or as to the constitution of the tribunal for any such consolidated proceedings, each party shall have the right
          to apply to the President for the time being of the LMAA for final determination of the consolidation of the proceedings and/or constitution of such tribunal.

      

      

      8. Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Promissory
          Note.

       

        

      
        3

        
          

      

      IN WITNESS WHEREOF, the Maker and the Holder have caused this Amendment No. 4 to be executed
          as of the first date written above.

      

      

      	 	
              THE MAKER:

            
	 	 
	 	
              SEANERGY MARITIME HOLDINGS CORP.

            
	 	

            
	 	
              By:

              

            	

            	/s/ Stamatios Tsantanis

      	 	
              

              

            	
              Name:

            	Stamatios Tsantanis

      	 	
              

              

            	
              Title:

              

            	Chief Executive Officer

      

      

      	 	
              THE HOLDER:

            
	 	 	 
	 	
              JELCO DELTA HOLDING CORP.

            
	 	 	 
	 	
              By:

                

            	 	/s/ Alastair Macdonald

      	 	

            	
              Name:

            	Alastair Macdonald
	 	

            	
              Title:

            	Director

       

      

      
        4

        
          

      

      SCHEDULE 1

      

      

      	
              
                Name and Address of Investor

              

            	 	
              
                Principal Amount Owned as of

                 29 May 2019

              

            	 
	
              Jelco Delta Holding Corp.

            	 	
              $

            	
              3,800,000

            	 
	
               

              

              c/o Western Isles

              Jardine House, 4th Floor,

              33-35 Reid Street

              P.O. Box HM 1431

              Hamilton HM FX, Bermuda

            	 	

            	 	 

      

      

      
         

          

        5Exhibit 4.51

      

       

      

      NEITHER THE SECURITIES REPRESENTED BY THIS NOTE NOR THE SECURITIES ISSUABLE UPON THE CONVERSION OF THIS NOTE HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR ANY STATE SECURITIES
        LAWS, AND NEITHER SUCH SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, ASSIGNED OR OTHERWISE TRANSFERRED UNLESS (1) A REGISTRATION STATEMENT WITH RESPECT THERETO IS EFFECTIVE UNDER THE ACT AND ANY APPLICABLE STATE SECURITIES LAWS, OR (2)
        AN EXEMPTION FROM SUCH REGISTRATION EXISTS AND THE MAKER RECEIVES AN OPINION OF COUNSEL TO THE HOLDER OF SUCH SECURITIES, WHICH COUNSEL AND OPINION ARE SATISFACTORY TO THE COMPANY, THAT SUCH SECURITIES MAY BE OFFERED, SOLD, PLEDGED, ASSIGNED OR
        TRANSFERRED IN THE MANNER CONTEMPLATED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT OR APPLICABLE STATE SECURITIES LAWS.

      

      

      TWELFTH AMENDMENT TO

      REVOLVING CONVERTIBLE PROMISSORY NOTE

      

      

      This TWELFTH AMENDMENT (this “Twelfth Amendment”) to the Revolving Convertible Promissory Note
        dated as of September 7, 2015, as amended by an Amendment dated as of December 1, 2015, further amended by a Second Amendment dated as of December 14, 2015, further amended by a Third Amendment dated as of January 27, 2016, further amended by a
        Fourth Amendment dated as of March 7, 2016, further amended by a Fifth Amendment dated as of April 21, 2016, further amended by a Sixth Amendment dated as of May 17, 2016, further amended by a Seventh Amendment dated as of June 16, 2016, further
        amended by an Eighth Amendment dated as of March 28, 2017, further amended by a Ninth Amendment dated as of September 27, 2017, further amended by a Tenth Amendment dated September 1, 2018 and as further amended by an Eleventh Amendment dated as of
        March 26, 2019 (together, as so amended, the “Note”), by and between Seanergy Maritime Holdings Corp. a corporation organized under the laws of the Republic of the Marshall Islands (the “Maker”) and Jelco Delta Holding Corp., or its respective registered assigns (the “Holder”), is made on May 29, 2019.

      

      

      Capitalized terms used but not defined herein shall have the meaning assigned in the Note.

      

      

      WHEREAS, in exchange for, among other things, the full and final settlement of unpaid interest in the amount of
          $901,286.84 accrued under the Note until March 31, 2019 and the neutralization of the Note’s interest rate for the period from April 1, 2019 until December 31, 2019, the Maker issued to the Holder 1,823,529 units of the Maker, each unit
          consisting of (i) one common share, par value $0.0001 per share  (a “Common Share”) of the Maker, (ii) one Class B Warrant of the Maker to purchase a Common Share, and (iii) one Class C Warrant of the Maker to purchase a Common Share, for $3.40
          per unit pursuant to the terms of a Securities Purchase Agreement dated as of May 9, 2019 made between the Maker and the Holder;

      

      

      WHEREAS, the parties wish to amend Section 3 of the Note as hereinafter set forth in detail below.

       

        

      
        
          

      

      NOW, THEREFORE, in consideration of the premises and the mutual agreements herein contained, the parties hereto
          hereby agree as follows:

      

      

      (A)        Section 3 of the Note is deleted in its entirety and is replaced with the following:

      

      

      “3.          Interest. The Maker shall pay interest on the outstanding principal amount of this Note, which shall accrue: (i) from 1 April 2019 through 31
        December 2019 (inclusive), at a rate of 0% per annum, and (ii) from 1 January 2020 through the Maturity Date, at a rate equal to the sum of (a) 5% per annum and (b) the three (3) month London Interbank Offered Rate for deposits in Dollars
        determined at or about 11.00 a.m. (London time) two (2) business days prior to the first day of each interest period (the “Interest Rate”). Each interest period shall be of three (3) months each, commencing on 1 January 2020. Each interest payment
        shall be made on the end of the respective interest period. In case the date of each interest payment is not a business day, the respective interest shall be payable on the next following business day. All interest payable under this Note shall
        accrue from day to day and be calculated on the basis of actual days elapsed and a 360-day year. Notwithstanding the above, the last interest period shall end on the Maturity Date.  In the event of a failure by the Maker to pay any amount on the
        date on which such amount is due and payable pursuant to this Note and irrespective of any notice by the Holder or any other person to the Maker in respect of such failure, the Maker shall pay interest on such amount on demand from the date of such
        default up to the date of actual payment at the per annum rate which is the aggregate of: (a) two point fifty per cent (2.50%); and (b) the Interest Rate.”

       

      
        
          	(B)	
                  Confirmation of Agreement.  Except as expressly set forth herein, the Note is ratified and confirmed in all respects and shall
                      remain in full force and effect in accordance with its terms, and each reference in the Note to “this Note” shall mean the Note as amended by this Twelfth Amendment.

                

        

      

      

      

      
        
          	(C)	
                  Counterparts; Effectiveness.  This Twelfth Amendment may be executed in any number of counterparts (including by facsimile) and by different parties hereto in separate counterparts, with the same effect as if all parties had signed the same
                        document.  All such counterparts shall be deemed an original, shall be construed together and shall constitute one and the same instrument.  This Twelfth Amendment shall become effective
                        when each party hereto shall have received counterparts hereof signed by all of the other parties hereto.

                

        

      

      

      

      
        
          

      

      
        
          	(D)	
                  Governing Law; Consent to Jurisdiction.  This Twelfth

                      Amendment shall be governed by and construed in accordance with the internal laws of the State of New York (without reference to the conflicts of law provisions thereof). Any dispute regarding this Twelfth

                      Amendment shall be exclusively referred to arbitration in London and conducted in accordance with the Arbitration Act 1996 (England and Wales) or any statutory modification or re-enactment thereof,
                        and the parties agree to submit to the personal and exclusive jurisdiction and venue of such arbitrators. Any and all disputes hereunder shall be referred by the parties hereto to three arbitrators, each party to appoint one
                        arbitrator and the two so appointed shall appoint the third who shall act as chairman of such panel of arbitrators.  Upon receipt by one party of the nomination in writing of such other party’s arbitrator, that party shall appoint
                        its arbitrator within ten days, failing which the decision of the single arbitrator appointed shall apply. The two arbitrators so appointed shall appoint the third arbitrator within ten days, failing which the third arbitrator shall
                        be appointed by the President of the London Maritime Arbitrators Association (“LMAA”) at the time within twenty one days of the two arbitrators being appointed. The arbitration shall be conducted in accordance with the terms of the
                        LMAA then in effect.  The parties agree that any tribunal constituted under this Agreement shall have the power to order consolidation of proceedings or concurrent hearings in relation to any and all disputes arising out of or in
                        connection with this Twelfth Amendment or the other documents contemplated thereby, which involve common questions of fact or law, and to make any orders ancillary to the same, including,
                        without limitation, any orders relating to the procedures to be followed by the parties in any such consolidated proceedings or concurrent hearings. Consolidated disputes are to be heard by a maximum of three arbitrators, each party
                        to have the right to appoint one arbitrator. In case a dispute arises as to whether consolidation is appropriate (including without limitation conflicting orders of relevant tribunals) and/or as to the constitution of the tribunal
                        for any such consolidated proceedings, each party shall have the right to apply to the President for the time being of the LMAA for final determination of the consolidation of the proceedings and/or constitution of such tribunal.

                

        

      

      

      

      [Signature page follows]

       

      

      
        
          

      

      THIS TWELFTH AMENDMENT has been entered into on the date stated above.

       

      	
              THE MAKER:

            
	 
	
              SEANERGY MARITIME HOLDINGS CORP.

            
	 

      	

            	
              /s/ Stamatios Tsantanis

            

      	 	
              By:

            	

            	 

      	 	

            	Name: Stamatios Tsantanis	 
	 	

            	Title: Chief Executive Officer	 

      

      

      	
              THE HOLDER:

            	 
	 	 
	
              JELCO DELTA HOLDING CORP.

            	 

      	 	 
	 	
              /s/ Alastair Macdonald

            

      	 	
              By:

            	 	 
	 	
              

              

            	Name: Alastair Macdonald	 
	 	

            	
              Title: Director

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