EX-4.3





 Exhibit 4.3 

DESCRIPTION OF THE REGISTRANT’S SECURITIES 

REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES 

EXCHANGE ACT OF 1934 
 The following is a
description of the common stock, $0.00001 par value per share (“Common Stock”) of Bolt Biotherapeutics, Inc. (the “Company,” “we,” “our,” or “us”), which is the only security of the Company
registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended. The following summary description is based on the provisions of our Amended and Restated Certificate of Incorporation (the “Certificate of
Incorporation”), our Amended and Restated Bylaws, (the “Bylaws”), and the applicable provisions of the Delaware General Corporation Law (the “DGCL”). This information may not be complete in all respects and is qualified
entirely by reference to the provisions of our Certificate of Incorporation and our Bylaws. Our Certificate of Incorporation and our Bylaws are filed as exhibits to our Annual Report on Form 10-K of which this
exhibit is a part. 
 Authorized Capital Shares 
 Our
authorized capital stock consists of 200,000,000 shares of common stock, $0.00001 par value per share, and 10,000,000 shares of preferred stock, par value $0.00001 per share. In addition, under our Certificate of Incorporation, our board of
directors may, without further action by our stockholders, fix the rights, preferences, privileges and restrictions of up to an aggregate of 10,000,000 shares of preferred stock in one or more series and authorize their issuance. These rights,
preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences and the number of shares constituting any series or the designation of such series, any or all of which may be
greater than the rights of common stock. Any issuance of preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders would receive dividend payments and payments on liquidation. In
addition, the issuance of preferred stock could have the effect of delaying, deterring or preventing a change of control or other corporate action. As of December 31, 2020, we have no shares of preferred stock issued and outstanding. We have no
present plans to issue any shares of preferred stock. For a complete description of the terms and provisions of the Company’s preferred stock refer to our Certificate of Incorporation and Bylaws. 

Common Stock 
 Voting Rights 

Each holder of common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors.
Under our Certificate of Incorporation, our stockholders do not have cumulative voting rights. Because of this, the holders of a majority of the shares of common stock entitled to vote in any election of directors can elect all of the directors
standing for election. These provisions in our Certificate of Incorporation could discourage potential takeover attempts. See “Certificate of Incorporation and Bylaws” below. 

Dividend Rights 
 Subject to preferences that may
apply to any then-outstanding preferred stock, the holders of common stock are entitled to receive ratably those dividends, if any, as may be declared from time to time by the board of directors out of legally available funds. We do not anticipate
paying any cash dividends in the foreseeable future. 
 Liquidation Rights 

In the event of our liquidation, dissolution or winding up, holders of common stock will be entitled to share ratably in the net assets legally available for
distribution to stockholders after the payment of all of our debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then-outstanding shares of preferred stock. 












 Preemptive or Similar Rights 

Holders of common stock have no preemptive, conversion or subscription rights and there are no redemption or sinking fund provisions applicable to the common
stock. The rights, preferences and privileges of the holders of common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of preferred stock that we may designate in the future. 

Anti-Takeover Provisions 
 Section 203 of the
Delaware General Corporation Law 
 We are subject to Section 203 of the DGCL, which generally prohibits a publicly held Delaware corporation
from engaging in any business combination with any interested stockholder for a period of three years after the date that such stockholder became an interested stockholder, with the following exceptions: 

 

	 	•	 	 before such date, the board of directors of the corporation approved either the business combination or the
transaction that resulted in the stockholder becoming an interested stockholder; 


  

	 	•	 	 upon completion of the transaction that resulted in the stockholder becoming an interested stockholder, the
interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction began, excluding for purposes of determining the voting stock outstanding, but not the outstanding voting stock owned by the
interested stockholder, those shares owned (1) by persons who are directors and also officers and (2) employee stock plans in which employee participants do not have the right to determine confidentially whether shares held subject to the
plan will be tendered in a tender or exchange offer; or 


  

	 	•	 	 on or after such date, the business combination is approved by the board of directors and authorized at an annual
or special meeting of the stockholders, and not by written consent, by the affirmative vote of at least 66 2/3% of the outstanding voting stock that is not owned by the interested stockholder. 



In general, Section 203 defines a “business combination” to include the following: 

 

	 	•	 	 any merger or consolidation involving the corporation and the interested stockholder; 



 

	 	•	 	 any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the
interested stockholder; 


  

	 	•	 	 subject to certain exceptions, any transaction that results in the issuance or transfer by the corporation of any
stock of the corporation to the interested stockholder; 


  

	 	•	 	 any transaction involving the corporation that has the effect of increasing the proportionate share of the stock
or any class or series of the corporation beneficially owned by the interested stockholder; or 


  

	 	•	 	 the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other
financial benefits by or through the corporation. 


 In general, Section 203 defines an “interested stockholder” as an
entity or person who, together with the person’s affiliates and associates, beneficially owns or within three years prior to the time of determination of interested stockholder status did own, 15% or more of the outstanding voting stock of the
corporation. 
 A Delaware corporation may “opt out” of these provisions with an express provision in its original certificate of incorporation or
an express provision in its Certificate of Incorporation or Bylaws resulting from a stockholders’ amendment approved by at least a majority of the outstanding voting shares. We have not opted out of these provisions. As a result, mergers or
other takeover or change in control attempts of us may be discouraged or prevented. 












 Certificate of Incorporation and Bylaws 

Among other things, our Certificate of Incorporation and Bylaws: 
  

	 	•	 	 permit our board of directors to issue up to 10,000,000 shares of preferred stock, with any rights, preferences
and privileges as they may designate, including the right to approve an acquisition or other change of control; 


  

	 	•	 	 provide that the authorized number of directors may be changed only by resolution of our board of directors;



  

	 	•	 	 provide that our board of directors is classified into three classes of directors; 



 

	 	•	 	 provide that, subject to the rights of any series of preferred stock to elect directors, directors may only be
removed for cause, which removal may be effected, subject to any limitation imposed by law, by the holders of at least 66 2/3% of the voting power of all of our then-outstanding shares of the capital stock entitled to vote generally at an election
of directors; 


  

	 	•	 	 provide that all vacancies, including newly created directorships, may, except as otherwise required by law, be
filled by the affirmative vote of a majority of directors then in office, even if less than a quorum; 


  

	 	•	 	 require that any action to be taken by our stockholders must be effected at a duly called annual or special
meeting of stockholders and not be taken by written consent or electronic transmission; 


  

	 	•	 	 provide that stockholders seeking to present proposals before a meeting of stockholders or to nominate candidates
for election as directors at a meeting of stockholders must provide advance notice in writing, and also specify requirements as to the form and content of a stockholder’s notice; 



 

	 	•	 	 provide that special meetings of our stockholders may be called only by the chairperson of our board of
directors, our chief executive officer or by our board of directors pursuant to a resolution adopted by a majority of the total number of authorized directors; and 



 

	 	•	 	 not provide for cumulative voting rights, therefore allowing the holders of a majority of the shares of common
stock entitled to vote in any election of directors to elect all of the directors standing for election, if they should so choose. 


 The
amendment of any of these provisions requires approval by the holders of at least 66 2/3% of the voting power of all of our then-outstanding capital stock entitled to vote generally in the election of directors, voting together as a single class.

 The combination of these provisions makes it more difficult for our existing stockholders to replace our board of directors as well as for another party
to obtain control of us by replacing our board of directors. Since our board of directors has the power to retain and discharge our officers, these provisions could also make it more difficult for existing stockholders or another party to effect a
change in management. In addition, the authorization of undesignated preferred stock makes it possible for our board of directors to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to
change our control. 
 These provisions are intended to enhance the likelihood of continued stability in the composition of our board of directors and its
policies and to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed to reduce our vulnerability to hostile takeovers and to discourage certain tactics that may be used in proxy fights. However,
such provisions could have the effect of discouraging others from making tender offers for our shares and may have the effect of delaying changes in our control or management. As a consequence, these provisions may also inhibit fluctuations in the
market price of our stock. 
 Choice of Forum 
 Our
Certificate of Incorporation provides that the Court of Chancery of the State of Delaware will be the exclusive forum for the following types of actions or proceedings under Delaware statutory or common law: any derivative action or proceeding
brought on our behalf; any action asserting a breach of fiduciary duty owed by any of our directors, officers, employees or stockholders to us or our stockholders; any action asserting a claim against us arising pursuant to the DGCL, our Certificate
of Incorporation or our Bylaws; or any action asserting a claim against us that is governed by the internal affairs doctrine. In addition, our amended and restated certificate of further provides that the federal district courts of the United States
of America will be the exclusive forum for resolving any 












 
complaint asserting a cause of action arising under the Securities Act. These provisions do not apply to suits brought to enforce a duty or liability created by the Exchange Act or any claim for
which the federal district courts of the United States of America have exclusive jurisdiction. Any person or entity purchasing or otherwise acquiring or holding any interest in any shares of our common stock shall be deemed to have notice of and
consented to these exclusive forum provisions and will not be deemed to have waived our compliance with the federal securities laws and the regulations promulgated thereunder. 

Corporate Opportunity Doctrine 
 The DGCL
permits corporations to adopt provisions renouncing any interest or expectancy in certain opportunities that are presented to the corporation or its officers, directors or stockholders. Our Certificate of Incorporation, to the extent permitted by
the DGCL, renounces any interest or expectancy that we have in, or right to be offered an opportunity to participate in, specified business opportunities that are from time to time presented to a member of our board of directors who is not our
employee, or any partner, member, director, stockholder, employee or agent of such member, other than one of our employees. Notwithstanding the foregoing, our Certificate of Incorporation does not renounce our interest in any business opportunity
that is expressly offered to a director solely in their capacity as a director. 
 Exchange Listing 

Our common stock is listed on the Nasdaq Global Select Market under the symbol “BOLT.” 

Transfer Agent and Registrar 
 The
transfer agent and registrar for our common stock is American Stock Transfer & Trust Company, LLC. The transfer agent’s address is 6201 15th Avenue, Brooklyn, New York 11219 and the telephone number is (800) 937-5449.