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Exhibit 4.2

DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT 
The following description of registered securities of Curis, Inc. (“us,” “our,” “we” or the “Company”) is intended as a summary only and therefore is not a complete description. This description is based upon, and is qualified by reference to, our certificate of incorporation, our bylaws and applicable provisions of the Delaware General Corporate Law (the “DGCL”). You should read our certificate of incorporation and by-laws, which are incorporated by reference as Exhibit 3.1 and Exhibit 3.3, respectively, to the Annual Report on Form 10-K of which this Exhibit 4.2 is a part, for the provisions that are important to you.
Authorized Capital Stock
Our authorized capital stock consists of 151,875,000 shares of common stock, par value $0.01 per share, and 5,000,000 shares of preferred stock, par value $0.01 per share. Our common stock is registered under Section 12(b) of the Exchange Act.
Common Stock
Voting Rights. For all matters submitted to a vote of stockholders, each holder of common stock is entitled to one vote for each share registered in his or her name on our books. Our common stock does not have cumulative voting rights. Except when a larger vote is required by applicable law, our certificate of incorporation or our by-laws, all elections shall be decided by a plurality, and all other questions shall be decided by a majority of the votes cast by stockholders entitled to vote thereon at a duly held meeting of stockholders at which a quorum is present. The presence in person or by proxy of the holders of record of a majority of our issued and outstanding shares entitled to vote at such meeting constitutes a quorum for the transaction of business at meetings of the stockholders.
Dividends. If our board of directors declares a dividend, holders of common stock will receive payments from our funds that are legally available to pay dividends. However, this dividend right is subject to any preferential dividend rights we may grant to the persons who hold preferred stock, if any is outstanding.
Liquidation and Dissolution. If we are liquidated or dissolved, the holders of our common stock will be entitled to share ratably in all the assets that remain after we pay our liabilities and any amounts we may owe to the persons who hold preferred stock, if any is outstanding. 
Other Rights. Holders of the common stock have no right to:  
•convert the stock into any other security,
•have the stock redeemed, 
•purchase additional stock, or
•maintain their proportionate ownership interest and there are no sinking fund provisions applicable to our 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 the Company may designate and issue.
Preferred Stock
We are authorized to issue “blank check” preferred stock, which may be issued in one or more series upon authorization of our board of directors. Our board of directors is authorized to fix the designation of the series, the number of authorized shares of the series, dividend rights and terms, conversion rights, voting rights, redemption rights and terms, liquidation preferences and any other rights, powers, preferences and limitations applicable to each series of preferred stock. The authorized shares of our preferred stock are available for issuance without further action by our stockholders, unless such action is required by applicable law or the rules of any stock exchange on which our securities may be listed. If the approval of our stockholders is not required for the issuance of shares of our preferred stock, our board may determine not to seek stockholder approval.
A series of our preferred stock could, depending on the terms of such series, impede the completion of a merger, tender offer or other takeover attempt. Our board of directors will make any determination to issue preferred shares based upon its judgment as to the best interests of our stockholders. Our directors, in so acting, could issue preferred stock having terms that could discourage an acquisition attempt through which an acquirer may be able to change the composition of our board of 

directors, including a tender offer or other transaction that some, or a majority, of our stockholders might believe to be in their best interests or in which stockholders might receive a premium for their stock over the then-current market price of the stock.
Provisions of Our Certificate of Incorporation and By-laws and the Delaware Law That May Have Anti-Takeover Effects
Board of Directors. Our by-laws provide for a board of directors divided as nearly equally as possible into three classes. Each class is elected to a term expiring at the annual meeting of stockholders held in the third year following the year of such election. The number of directors comprising our board of directors is fixed from time to time by the board of directors.
Removal of Directors by Stockholders. Our by-laws provide that directors may be removed only for cause by the affirmative vote of the holders of 75% of the shares of our capital stock issued, outstanding and entitled to vote. 
Advance Notice Provisions. Our by-laws provide that a stockholder must notify us in writing of any stockholder nomination of a director and of any other business that the stockholder intends to bring at a meeting of stockholders not earlier than the 90th day and not later than the 60th day prior to such meeting; provided, if less than 70 days’ notice or prior public disclosure of the date of the meeting is given to stockholders, such nomination shall have been mailed or delivered to the Secretary not later than the close of business on the 10th day following the date on which the notice of the meeting was mailed or such public disclosure was made, whichever occurs first.
No Action by Written Consent. Our certificate of incorporation provides that our stockholders may not act by written consent and may only act at duly called meetings of stockholders; and that the affirmative vote of the holders of at least 75% of the shares of capital stock issued and outstanding and entitled to vote shall be required to amend or repeal, or to adopt any provision inconsistent with, the provision of our certificate of incorporation prohibiting stockholders from acting by written consent.
Amendment to Bylaws. Our by-laws may be amended or repealed by a majority vote of our board of directors or by the affirmative vote of the holders of a majority of our capital stock issued and outstanding and entitled to vote. In addition, the affirmative vote of the holders of at least 75% of the shares of our capital stock issued and outstanding and entitled to vote shall be required to amend or repeal, or to adopt any provision inconsistent with the provisions of our by-laws related to the powers, number, term, classification, committees, the conduct of business at meetings, action by written consent, removal and filling of vacancies with respect to our board of directors; the calling of special meetings of stockholders; the nomination of directors; notice of business at an annual meeting and any provision relating to the amendment of any of these provisions.
Delaware Business Combination Statute. We are subject to Section 203 of the DGCL (“Section 203”), which prohibits a Delaware corporation from engaging in business combinations with an interested stockholder. An interested stockholder is generally defined as an entity or person beneficially owning 15% or more of the outstanding voting stock of the corporation or any entity or person affiliated with or controlling or controlled by such entity or person (“interested stockholder”).  Section 203 provides that an interested stockholder may not engage in business combinations with the corporation 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 (i) by persons who are directors and also officers and (ii) 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 business combinations to include the following:
•any merger or consolidation involving the corporation and the interested stockholder;
•any sale, lease, transfer, pledge or other disposition of 10% or more of the assets of the corporation to or with 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 loss, advances, guarantees, pledges or other financial benefits by or through the corporation.Document

Notice of Grant of Stock Options and Option Agreement
Curis, Inc.
ID: 04-3505116
128 Spring Street
Lexington, MA 02421

									
	%%FIRST_NAME%-% %%LAST_NAME%-%	Option Number:	%%OPTION_NUMBER%-%
	%%ADDRESS_LINE_1%-%	Plan:	%%EQUITY_PLAN%-%
	%%CITY%-%, %%STATE%-% %%ZIPCODE%-%	ID:	%%EMPLOYEE_IDENTIFIER%-%

Effective %%OPTION_DATE,'MM/DD/YYYY'%-% (“Grant Date”), you have been granted a(n) Incentive Stock Option to buy a specified number of shares (“Shares”) of CURIS INC. (the “Company”) stock at specified price per share (“Exercise Price”). The details of your stock option grant are as follows:

						
	Date of Grant	%%OPTION_DATE,’MM/DD/YYYY’%-%
	Vesting Commencement Date	%%VEST_BASE_DATE,'MM/DD/YYYY'%-%
	Exercise Price Per Share	%%OPTION_PRICE,’$999,999,999.99’%-%
	Total Number of Shares Granted	%%TOTAL_SHARES_GRANTED%-%
	Total Exercise Price	%%TOTAL_OPTION_PRICE,’$999,999,999.99’%-%
	Term/Expiration Date	%%EXPIRE_DATE_PERIOD1,’MM/DD/YYYY’%-%

Shares in each period will become fully vested on the dates shown below:

									
	Shares	Vest Type	Full Vest
	%%SHARES_PERIOD1,'999,999,999'%-%	On Vest Date	%%VEST_DATE_PERIOD1,'MM/DD/YYYY'%-%
	%%SHARES_PERIOD2,'999,999,999'%-%	[Quarterly]	%%VEST_DATE_PERIOD2,'MM/DD/YYYY'%-%

By clicking “Accept”, you and the Company agree that these options are granted under and governed by the terms and conditions of the Company's Incentive Stock Option Agreement, all of which are attached and made a part of this document.

Terms and Conditions of Incentive Stock Option Agreement

1.Grant of Option.
This agreement evidences the grant by Curis, Inc., a Delaware corporation (the “Company”), on the Grant Date to the Participant, an employee of the Company, of an option to purchase, in whole or in part, on the terms provided herein and in the Company’s Third Amended and Restated 2010 Stock Incentive Plan (the “Plan”), the Shares of common stock, $0.01 par value per share, of the Company (“Common Stock”) at the Per Share Exercise Price.  Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on the Expiration Date (the “Final Exercise Date”).
It is intended that the option evidenced by this agreement shall be an incentive stock option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the “Code”).  Except as otherwise indicated by the context, the term “Participant”, as used in this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms.
2.Vesting Schedule.
This option will become exercisable (“vest”) as to 25% of the original number of Shares on the first anniversary of the Grant Date and as to an additional 6.25% of the original number of Shares at the end of each successive quarterly period following the first anniversary of the Grant Date until the fourth anniversary of the Grant Date. 
The right of exercise shall be cumulative so that to the extent the option is not exercised in any period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of the Final Exercise Date or the termination of this option under Section 3 hereof or the Plan.
Notwithstanding anything herein to the contrary, upon a termination or cessation of the status of the Participant as an Eligible Participant (as defined below) due to the Participant’s death or disability, the option shall become fully vested and exercisable as of the date of such death or disability.  For purposes of this agreement, “disability” shall have the meaning set forth in Section 22(e)(3) of the Code.  
3.Exercise of Option.
(a)Form of Exercise.  Each election to exercise this option shall be in writing, signed by the Participant, and received by the Company at its principal office, accompanied by this agreement, and payment in full in the manner provided in the Plan.  The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of this option may be for any fractional share or for fewer than ten whole shares.
(b)Continuous Relationship with the Company Required.  Except as otherwise provided in this Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee or officer of, or consultant or advisor to, the Company or any parent or subsidiary of the Company as defined in Section 424(e) or (f) of the Code (an “Eligible Participant”).
(c)Termination of Relationship with the Company.  If the Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three months after such cessation (but in no event after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was 

entitled to exercise this option on the date of such cessation.  Notwithstanding the foregoing, if the Participant, prior to the Final Exercise Date, violates the non-competition or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or other agreement between the Participant and the Company, the right to exercise this option shall terminate immediately upon written notice to the Participant from the Company describing such violation. 
(d)Exercise Period Upon Death or Disability.  If the Participant dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such relationship for “cause” as specified in paragraph (e) below, this option shall be exercisable, within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by an authorized transferee), provided that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall not be exercisable after the Final Exercise Date.
(e)Termination for Cause.  If, prior to the Final Exercise Date, the Participant’s employment is terminated by the Company for Cause (as defined below), the right to exercise this option shall terminate immediately upon the effective date of such termination of employment.  If the Participant is party to an employment, consulting or severance agreement with the Company that contains a definition of “cause” for termination of employment or other relationship, “Cause” shall have the meaning ascribed to such term in such agreement.  Otherwise, “Cause” shall mean any (i) willful failure by the Participant, which failure is not cured within 30 days of written notice to the Participant from the Company, to perform his or her material responsibilities to the Company or (ii) willful misconduct by the Participant which affects the business reputation of the Company.  The Participant’s employment shall be considered to have been terminated for Cause if the Company determines, within 30 days after the Participant’s resignation, that termination for Cause was warranted.
4.Tax Matters.
(a)Withholding.  No Shares will be issued pursuant to the exercise of this option unless and until the Participant pays to the Company, or makes provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option.  
(b)Disqualifying Disposition.  If the Participant disposes of Shares acquired upon exercise of this option within two years from the Grant Date or one year after such Shares were acquired pursuant to exercise of this option, the Participant shall notify the Company in writing of such disposition.
5.Transfer Restrictions.  This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during the lifetime of the Participant, this option shall be exercisable only by the Participant.
6.Provisions of the Plan. This option is subject to the provisions of the Plan (including the provisions relating to amendments to the Plan), a copy of which is furnished to the Participant with this option.

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