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Exhibit 4.3    
    

	State of Utah

Department of Commerce

Division of Corporations and Commercial Code	 	 	 	 
	

I Hereby certify that the foregoing has been filed

and approved on the 14th day of May, '93

in the office of this Division and hereby issue

this Certificate thereof.
 	
 	
ARTICLES OF AMENDMENT OF THE

ARTICLES OF INCORPORATION

OF

MERIT MEDICAL SYSTEMS, INC.	
 	

 
	

[SEAL]	
 	

KORLA T. WOODS	
 	

 	
 	

 
	 	 	
 KORLA T. WOODS

Division Director
 	 	 	 	 

        Pursuant
to the provisions of the Utah Revised Business Corporation Act, the undersigned corporation does hereby adopt the following Articles of Amendment to its Articles of
Incorporation: 

        1.     The
name of the corporation is MERIT MEDICAL SYSTEMS, INC. 

        2.     The
text of the Amendment adopted is as follows: The existing Article VII of the Articles of Incorporation is hereby deleted and replaced in its entirety as follows: 

 
 

ARTICLE VII    
    
    LIMITATION OF LIABILITY OF DIRECTORS    
    

        To the fullest extent permitted by the Utah Revised Business Corporation Act or any other applicable law as now in effect or as it may hereafter be amended, a
director of the corporation shall not be personally liable to the corporation or its shareholders for monetary damages for any action taken or any failure to take any action, as a director. 

        Neither
any amendment nor repeal of this Article VII, nor the adoption of any provision in these Articles of Incorporation inconsistent with this Article VII, shall eliminate or reduce
the effect of this Article VII in respect of any matter occurring, or any cause of action, suit or claim that, but for this Article VII, would accrue or arise, prior to such amendment, repeal or
adoption of an inconsistent provision. 

        3.     The
foregoing amendment does not provide for any exchange, reclassification cancellation of issued shares. 

        4.     The
foregoing amendment was adopted by the shareholders of the corporation on the 15th day of May, 1993. 

        5.     The
foregoing amendment was approved by the shareholders at a meeting duly called for such purposes as follows: 

        a.     The
designation of the voting group which voted on the amendment was Common Stock; the number of shares of Common Stock outstanding and the number of votes entitled to be
cast at the meeting by the Common Stock voting group was 6,243,808; the number of votes of the Common Stock indisputably represented at the meeting was 4,420,253, and 

        b.     the
total number of votes cast for the amendment by the Common Stock voting group was 4,121,378, and the total number of votes cast against the amendment by the Common
Stock voting group was 282,610. 

        DATED
this 13th day of May, 1993. 

	 	 	MERIT MEDICAL SYSTEMS, INC.,

a Utah corporation
	

 	
 	

By:	

/s/  FRED P. LAMPROPOULOS      
 Fred P. Lampropoulos

Chief Executive Officer

	ATTEST:	 
	

By:	
 	

/s/  KENT W. STANGER      
 Kent W. Stanger

Secretary

	

 

	STATE OF UTAH	)	 	 
	 	:ss	 	 
	COUNTY OF SALT LAKE	)	 	 

        On
this 13th day of May, 1993, personally appeared before me, Fred P. Lampropoulos and Kent W. Stanger, whose identity is personally known to me (or proved to me on the basis of
satisfactory evidence) and who by me duly sworn (or affirmed), did say that they are the Chief Executive Officer and Secretary, respectively, of Merit Medical Systems, Inc., and that said document was
signed by them in behalf of said corporation by authority of its bylaws (or of a Resolution of its Board of Directors), and said persons acknowledged to me that said corporation executed the same. 

	

  

  

  

[SEAL]	

/s/  RICHARD BROWN      
Notary Public
 A Notary Public Commissioned in Utah	

 
	

My commission expires	

 	

 

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Exhibit 4.3

ARTICLE VII LIMITATION OF LIABILITY OF DIRECTORSQuickLinks
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Exhibit 4.4    
    

	State of Utah

Department of Commerce

Division of Corporations and Commerce Code	 	 	 	 
	

I Hereby certify that the foregoing has been filed

and approved on the 7th day of June, '96

in the office of this Division and hereby issue

this Certificate thereof.
 	

 	

 ARTICLES OF AMENDMENT

TO

ARTICLES OF INCORPORATION

OF

MERIT MEDICAL SYSTEMS, INC.	

 	

 
	
Examiner BS    Date 6/7/96	
 	

 	
 	

 
	

[SEAL]	
 	

KORLA T. WOODS	
 	

 	
 	

 
	 	 	
 KORLA T. WOODS

Division Director
 	 	 	 	 

        Pursuant
to the provisions of the Utah Revised Business Corporation Act, the undersigned corporation (the "Corporation") hereby adopts the following Articles of Amendment to its Articles
of Incorporation: 

        1.     The
name of the Corporation is MERIT MEDICAL SYSTEMS, INC. 

        2.     The
text of each amendment adopted is as follows: 

        (a)   A
new Article XII shall be added to read in its entirety as follows: 

 
 

ARTICLE XII
  Vote Required to Approve Fundamental Changes    
    

        As
to the following matters, the affirmative vote of two-thirds of the shares entitled to vote shall be required to approve any proposed shareholder action which otherwise requires
shareholder approval under the Utah Revised Business Corporation Act: (a) to merge or consolidate the corporation with or into another corporation; (b) to sell, exchange, transfer or
otherwise dispose of all or substantially all of the corporation's property and assets; (c) to dissolve or liquidate the corporation; or (d) to amend, change or delete this
Article XII from the Articles of Incorporation. 

        3.     The
foregoing amendment to the Articles of Incorporation was adopted by the Board of Directors of the Corporation on April 15, 1996 and by the shareholders of the
Corporation on May 30, 1996. 

        4.     The
foregoing amendment to the Articles of Incorporation was not adopted by the Board of Directors without shareholder action. 

        5.     The
foregoing amendment to the Articles of Incorporation was approved by the shareholders as follows: 

	(a)
	the
designation of the voting group which voted on the amendment was Common Stock; the number of shares of Common Stock outstanding and the number of votes entitled to be cast at the
meeting by the Common Stock voting group was 6,839,606; the number of votes of the Common Stock voting group indisputably represented at the meeting was 5,347,153; and

	(b)
	the
total number of votes cast for the amendment by the Common Stock voting group was 3,066,014, and 594,928 votes were cast against the amendment by the Common Stock voting group. 

        DATED
this 6th day of June, 1996. 

	

 	
 	

MERIT MEDICAL SYSTEMS, INC.,

a Utah corporate
	

 	
 	

By:	
 	

/s/  FRED P. LAMPROPOULOS      
 Fred P. Lampropoulos, President and

Chief Executive Officer

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Exhibit 4.4

ARTICLE XII Vote Required to Approve Fundamental ChangesQuickLinks
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Exhibit 4.5    
    

	State of Utah

Department of Commerce

Division of Corporations and Commercial Code	 	 	 	 
	

I Hereby certify that the foregoing has been filed

and approved on the 18th day of June, 1997

in the office of this Division and hereby issue

this Certificate thereof.
 	

 	

 ARTICLES OF AMENDMENT

TO

ARTICLES OF INCORPORATION

OF

MERIT MEDICAL SYSTEMS, INC.	

 	

 
	
Examiner J    Date 6/24/97	
 	

 	
 	

 
	

[SEAL]	
 	

KORLA T. WOODS	
 	

 	
 	

 
	 	 	
 KORLA T. WOODS

Division Director
 	 	 	 	 

        Pursuant
to the provisions of the Utah Revised Business Corporation Act, the undersigned corporation (the "Corporation") hereby adopts the following Articles of Amendment to its Articles
of Incorporation: 

 
 

I.    
    

        The name of the corporation is Merit Medical Systems, Inc. 

 
 

II.    
    

        The following Amendments to the Articles of Incorporation were adopted by the shareholders of the Corporation on May 21, 1997 in the manner prescribed by
the Utah Revised Business Corporation Act: 

	A.
	Article
IV of the Art e of Incorporation is hereby amended to read as follows: 

 
 

ARTICLE IV
  AUTHORIZED SHARES    
    

        The
total number of shares of capital stock which the corporation shall have authority to issue is 25 million (25,000,000) of which five million (5,000,000) shall be shares of preferred
stock, no par value (hereinafter called "Preferred Stock") and 20 million (20,000,000) shall be shares of common stock, no par value (hereinafter called "Common Stock"). 

        The
designation, powers, preferences and relative, participating, optional or other special rights, and qualifications, limitations or restrictions thereof, of each class of stock, and
the express grant of authority to the board of directors to amend these Articles of Incorporation to fix the designation, powers, preferences and relative, participating, optional or other special
rights, and qualifications,
limitations or restrictions thereof, of each share of Preferred Stock which are not fixed by these Articles of Incorporation, are as follows: 

A.    PREFERRED
STOCK 

           1.  Number; Series. The Preferred Stock may be issued in one or more series, from time to time, with each such series to have
such designation, powers, preferences and relative, participating, optional or other special rights and qualifications, limitations or restrictions thereof, as shall be stated and expressed n an
amendment to these Articles of Incorporation providing for the issue of such series. The board of directors of the corporation is hereby 

1

 

expressly
vested with authority to amend the Articles of Incorporation, without shareholder action or approval, to: (a) create one or more series of Preferred Stock, fix the number of shares of
each such series (within the total number of authorized shares of Preferred Stock available for designation as a part of such series), and designate and determine, in whole or part, the preferences,
limitations, and relative rights of each series of Preferred Stock; (b) alter or revoke the preferences, limitations and relative rights granted to or imposed upon any wholly unissued series of
Preferred Stock; or (c) increase or decrease the number of shares constituting any series of Preferred Stock (the number of shares of which was originally fixed by the board of directors)
either before or after the issuance of shares of the series, provided that the number may not be decreased below the number of shares of such series then outstanding, or increased above the total
number of authorized shares of the Preferred Stock available for designation as a part of such series. Without limiting the foregoing, the authority of the board of directors with respect to each such
series shall include, but not be limited to, the determination or fixing of the following: 

        (i)    The
distinctive designation and number of shares comprising such series, which number may (except where otherwise provided by the board of directors in creating such
series) be increased or decreased (but not below the number of shares then outstanding) from time to time by like action of the board of directors; 

        (ii)   The
dividend rate of such series, the conditions and times upon which such dividends shall be payable, the relation which such dividends shall bear to the dividends
payable on any other class or classes of stock or series thereof, or on the other series of the same class, and whether dividends shall be cumulative or noncumulative; 

        (iii)  The
conditions upon which the shares of such series shall be subject to redemption by the corporation and the times, prices and other terms and provisions upon which
the shares of the series may be redeemed; 

        (iv)  Whether
or not the shares of the series shall be subject to the operation of retirement or sinking fund provisions to be applied to the purchase or redemption of such
shares and, if such retirement or sinking fund be established, the annual amount thereof and the terms and provisions relative to the operation thereof; 

        (v)   Whether
or not the shares of the series shall be convertible into or exchangeable for shares of any other class or classes, with or without par value, or of any other
series of the same class and, if provision is made for conversion or exchange, the times, prices, rates, adjustments and other terms and conditions of such conversion or exchange; 

        (vi)  Whether
or not the shares of the series shall have voting rights, in addition to the voting rights provided by law, and, if so, subject to the limitations hereinafter
set forth, the terms of such voting rights; 

        (vii) The
rights of the shares of the series in the event of voluntary or involuntary liquidation, dissolution or upon distribution of assets of the corporation; 

        (viii)   Any
other powers, preferences and relative, participating, optional or other special rights, and qualifications, limitations or restrictions thereof, of
the shares of such series, as the board of directors may deem advisable. 

        2.    Dividends.    The holders of the shares of Preferred Stock of each series shall be entitled to receive, when and
as declared by the board of directors, out of the funds legally available for the payment of dividends, dividends at the rate fixed by the board of directors for such series for the current period
and, if cumulative, for all prior periods for which such dividends are cumulative. 

2

 

        Whenever,
at any time, dividends on the then outstanding Preferred Stock as may be required with respect to any series outstanding shall have been paid or declared and set apart for
payment on the then outstanding Preferred Stock, and after complying with respect to any retirement or sinking fund or funds for all applicable series of Preferred Stock, the board of directors may,
subject to the provisions of the resolution or resolutions creating the series of Preferred Stock, declare and pay dividends on the Common Stock as provided in paragraph B.1. of this Article IV, and
the holders of shares of Preferred Stock shall not be entitled to share therein, except as otherwise provided in the amendment creating any series. 

        3.    Liquidation: Dissolution.    The holders of the Preferred Stock of each series shall be entitled upon
liquidation or dissolution of the corporation to such preferences as are provided in the amendment creating such series of Preferred Stock, and no more, before any distribution of the assets of the
corporation shall be made to the holders of shares of the Common Stock. Whenever the holders of shares of the Preferred Stock shall have been paid the full amounts to which they shall be entitled, the
holders of shares of the Common Stock shall be entitled to share in all assets of the corporation remaining as provided in paragraph B.2. of this Article IV. If, upon such liquidation,
dissolution or winding up, the assets of the corporation distributable as aforesaid among the holders of Preferred Stock of all series shall be insufficient to permit full payment to them of said
preferential amounts, then such assets shall be distributed ratably among such holders in proportion to the respective total amounts which they shall be entitled to receive as provided in this
paragraph 3. 

        4.    Voting.    Except as otherwise provided by an amendment to the Articles of Incorporation creating any series of
Preferred Stock or by the general corporation law of Utah, the Common Stock issued and outstanding shall have and possess the exclusive power to vote for the election of directors and for all other
purposes as provided in paragraph B.3. of this Article IV. 

        5.    Preemptive Rights.    Except as may be provided in the amendment adopted by the board of directors providing for
the issue of any series of Preferred Stock, no holder of shares of the Preferred Stock of the corporation shall, as such holder, be entitled as of right to subscribe for, purchase or receive any part
of any new or additional issue of stock of any class, whether now or hereafter authorized, or of bonds, debentures or other securities convertible into or exchangeable for stock, but all such
additional shares of stock of any class, or bonds, debentures or other securities convertible into or exchangeable for stock, may be issued and disposed of by the board of directors on such terms and
for such consideration, so far as may be permitted by law, and to such persons, as the board of directors in its absolute discretion may deem advisable. 

        B.
COMMON STOCK 

        1.    Dividends.    Subject to the rights of the holders of Preferred Stock, and subject to any other provisions of
the Articles of Incorporation, holders of Common Stock shall be entitled to receive such dividends and other distributions in cash, stock or property of the corporation as may be declared thereon by
the board of directors from time to time out of assets or funds of the corporation legally available therefor. 

        2.    Liquidation: Dissolution.    In the event of any liquidation, dissolution or winding up of the affairs of the
corporation, whether voluntary or involuntary, after payment or provision for payment of the debts and other liabilities of the corporation and after payment or provision for payment to the holders of
each series of Preferred Stock of all amounts required in accordance with paragraph A.3. of this Article IV, the remaining assets and funds of the corporation shall be divided among and paid to the
holders of Common Stock. 

3

 

        3.    Voting.

        (a)   At
every meeting of the shareholders every holder of Common Stock shall be entitled to one vote in person or by proxy for each share of such Stock standing in his name
on the stock transfer records of the corporation. 

        (b)   No
shareholder shall have the right to cumulate votes in the election of directors. 

        4.    Preemptive Rights.    No holder of shares of Common Stock of the corporation shall, as such holder, be entitled
as of right to subscribe for, purchase or receive any part of any new or additional issue of stock of any class, whether now or hereafter authorized, or of bonds, debentures or other securities
convertible into or exchangeable for stock, but all such additional shares of stock of any class, or bonds, debentures or other securities convertible into or exchangeable for stock, may be issued and
disposed of by the board of directors on such terms and for such consideration, so far as may be permitted by law, and to such persons, as the board of directors in its absolute discretion may deem
advisable. 

	B.
	Article
VI of the Articles of Incorporation is hereby amended to read as follows: 

 
 

ARTICLE VI
  DIRECTORS    
    

        The board of directors shall consist of such number of members, which number shall not be less than three and not more than nine as may be determined and
established from time to time by the board of directors and shall be divided into three classes, as nearly equal in size as possible. No increase in the maximum number of members shall be made except
upon the affirmative vote of not less than two-
thirds of the outstanding capital stock of the corporation entitled to vote thereon. The initial terms of directors first elected or reelected by the shareholders after the adoption of this amendment
and revision of the Articles of Incorporation shall be for the following terms of office: 

Class
A Directors—One Year 

Class
B Directors—Two Years 

Class
C Directors—Three Years 

        Upon
the expiration of the initial term specified for each class of directors, their successors shall be elected for three-year terms or until such time as their successors shall be
elected and qualified, with one class of directors to be elected each year. 

        Vacancies
on the board of directors, whether the result of removal (with or without cause), death, resignation or otherwise, shall be filled by majority vote of the remaining members of
the board of directors, regardless of whether such remaining members constitute a quorum. 

        The
corporation shall nominate persons to serve as members of the board of directors upon the expiration of the term of each class of directors, which nominations shall be submitted to
the shareholders at the annual meeting of shareholders for approval. Any nominations for election to the board of directors shall be received, with respect to any annual meeting of shareholders, not
later than the date specified by the board of directors for submission of such nominations. Failure to submit timely nominations shall prevent consideration of the nominations at such annual
shareholders' meetings. 

        Directors
of the corporation may be removed "for cause" only upon the affirmative vote of the holders of a majority of the outstanding capital stock entitled to vote thereon. A director
may be removed for cause only after a finding that (i) the director engaged in fraudulent or dishonest conduct or gross abuse of authority or discretion, with respect to the 

4

 

corporation
and (ii) removal is in the best interests of the corporation. Directors of the corporation may be removed for any reason other than cause only upon the affirmative vote of the
holders of not less than two-thirds of the outstanding capital stock of the corporation entitled to vote thereon. 

 
 

III.    
    

        The number of shares of the capital stock of the Corporation outstanding and entitled to be cast on the foregoing Amendments by the shareholders of the
Corporation was 7,239,681 shares of common stock (the "Common Stock"). No other class of shares was issued and outstanding. 

 
 

IV.    
    

        The number of shares of the Common Stock voted for the Amendment to Article IV was 2,962,020 shares; 977,908 shares of the Common Stock were voted against such
Amendment. The number of shares of the Common Stock voted for the Amendment to Article VI was 3,161,677 shares; 970,848 shares of the Common Stock were voted against such Amendment. 

        DATED
this 12th day of June, 1997 

	

 	
 	

Merit Medical Systems, Inc., a Utah corporation
	

 	
 	

By:	
 	

/s/  KENT W. STANGER      
 Kent W. Stanger, Chief Financial Officer,

Secretary and Treasurer

5

QuickLinks

Exhibit 4.5

I.

II.

ARTICLE IV AUTHORIZED SHARES

ARTICLE VI DIRECTORS

III.

IV.

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