Document:

EX-4.3

 Exhibit 4.3 

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is made as of the [●] day of January, 2021, by and among Cullinan
Management, Inc., a Delaware corporation (the “Company”), and each of the investors listed on Schedule A hereto, each of which is referred to in this Agreement as an “Investor”. 

RECITALS 

WHEREAS, the Investors and the Company hereby agree that this Agreement shall govern the registration rights of the Common Stock issued
or issuable to the Investors. 
 NOW, THEREFORE, the parties hereby agree as follows: 

1.    Definitions. For purposes of this Agreement: 

1.1    “Affiliate” means a Person that directly, or indirectly through one or more intermediaries,
Controls, is Controlled by or is under common Control with the Person specified, including without limitation any general partner, managing member, manager, officer or director of such Person and any venture capital or other investment fund now or
hereafter existing that is controlled by or under common control with one or more general partners or managing members of, or shares the same management company or investment advisor with, such Person. 

1.2    “Board of Directors” means the Board of Directors of the Company. 

1.3    “Certificate of Incorporation” means the Company’s certificate of incorporation (as amended
and in effect). 
 1.4    “Common Stock” means shares of the Company’s common stock, par value
$0.0001 per share. 
 1.5     “Control” of a Person means the possession, direct or indirect, of the
power to vote in excess of 50% of the voting power of such Person, to appoint the majority of the managers, general partners or the equivalent of such Person, or to direct or cause the direction of the management and policies of such Person (e.g.,
as managing member or in a similar capacity but not including an advisory or management agreement (in the case of a managed account)). 

1.6    “Damages” means any loss, damage, claim, or liability (joint or several) to which a party hereto
may become subject under the Securities Act, the Exchange Act, or other federal or state law, insofar as such loss, damage, claim, or liability (or any action in respect thereof) arises out of or is based upon: (i) any untrue statement or
alleged untrue statement of a material fact contained in any registration statement of the Company, including any preliminary prospectus or final prospectus contained therein or any amendments or supplements thereto; (ii) an omission or alleged
omission to state therein a material fact required to be stated therein, or necessary to make the statements therein not misleading; or (iii) any violation or alleged violation by the indemnifying party (or any of its agents or Affiliates) of
the Securities Act, the Exchange Act, any state securities law, or any rule or regulation promulgated under the Securities Act, the Exchange Act, or any state securities law. 

 1.7    “Exchange Act” means the Securities Exchange Act
of 1934, as amended, and the rules and regulations promulgated thereunder. 
 1.8    “Excluded
Registration” means: (i) a registration relating to the sale of securities to employees of the Company or a subsidiary pursuant to a stock option, stock purchase, or similar plan; (ii) a registration relating to an SEC Rule 145
transaction; (iii) a registration on any form that does not include substantially the same information as would be required to be included in a registration statement covering the sale of the Registrable Securities; or (iv) a registration
in which the only Common Stock being registered is Common Stock issuable upon conversion of debt securities that are also being registered. 

1.9    “Form S-1” means such registration form under the
Securities Act as in effect on the date hereof or any successor registration form under the Securities Act subsequently adopted by the SEC. 

1.10    “Form S-3” means such registration form under the
Securities Act as in effect on the date hereof or any registration form under the Securities Act subsequently adopted by the SEC that permits incorporation of substantial information by reference to other documents filed by the Company with the SEC.

 1.11    “Holder” means any holder of Registrable Securities who is a party to this Agreement. 

1.12    “Immediate Family Member” means a child, stepchild, grandchild, parent, stepparent, grandparent,
spouse, sibling, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law, including adoptive relationships, of a natural person referred to herein. 

1.13    “Initiating Holders” means, collectively, Holders who properly initiate a registration request
under this Agreement. 
 1.14    “IPO” means the Company’s first underwritten public offering of
its Common Stock under the Securities Act. 
 1.15     “Person” means any individual, corporation,
partnership, trust, limited liability company, association or other entity. 
 1.16    “Preferred
Stock” means shares of the Company’s Series Seed Preferred Stock, par value $0.0001 per share, Series A1 Preferred Stock, par value $0.0001 per share, Series B Preferred Stock, par value $0.0001 per share and Series C Preferred Stock,
par value $0.0001 per share. 
 1.17    “Registrable Securities” means (i) the Common Stock
issuable or issued upon conversion of the Preferred Stock; (ii) any Common Stock, or any Common Stock issued or issuable (directly or indirectly) upon conversion and/or exercise of any other securities of the Company held by the Investors; and
(iii) any Common Stock issued as (or issuable upon the conversion or exercise of any warrant, right, or other security that is issued as) a dividend or other distribution with respect to, or in exchange for or in replacement of, the shares
referenced 

 
in clauses (i) and (ii) above; excluding in all cases, however, any Registrable Securities sold by a Person in a transaction in which the applicable rights under this Agreement are not
assigned pursuant to Section 4.1, and excluding for purposes of Section 2 any securities for which registration rights have terminated pursuant to Section 2.13 of this
Agreement. 
 1.18     “Registrable Securities then outstanding” means the number of shares determined
by adding the number of shares of outstanding Common Stock that are Registrable Securities and the number of shares of Common Stock issuable (directly or indirectly) pursuant to then exercisable and/or convertible securities that are
Registrable Securities. 
 1.19    “Restricted Securities” means the securities of the Company required
to bear the legends set forth in Section 2.12(b) hereof. 
 1.20    “Sale Event” means:

 (a)    a merger or consolidation in which 
  

	 	(i)	 the Company is a constituent party or 

 

	 	(ii)	 a subsidiary of the Company is a constituent party and the Company issues shares of its capital stock pursuant
to such merger or consolidation, 

 except any such merger or consolidation involving the Company or a subsidiary in which the shares of
capital stock of the Company outstanding immediately prior to such merger or consolidation continue to represent, or are converted into or exchanged for shares of capital stock that represent, immediately following such merger or consolidation, at
least a majority, by voting power, of the capital stock of (1) the surviving or resulting corporation or (2) if the surviving or resulting corporation is a wholly owned subsidiary of another corporation immediately following such merger or
consolidation, the parent corporation of such surviving or resulting corporation (provided that, all shares of Common Stock issuable upon exercise of options outstanding immediately prior to such merger or consolidation or upon conversion of
convertible securities outstanding immediately prior to such merger or consolidation shall be deemed to be outstanding immediately prior to such merger or consolidation and, if applicable, converted or exchanged in such merger or consolidation on
the same terms as the actual outstanding shares of Common Stock are converted or exchanged); or 
 (b)    the sale,
lease, transfer, exclusive license or other disposition, in a single transaction or series of related transactions, by the Company or any subsidiary of the Company of all or substantially all the assets of the Company and its subsidiaries taken as a
whole, or the sale or disposition (whether by merger or otherwise) of one or more subsidiaries of the Company if substantially all of the assets of the Company and its subsidiaries taken as a whole are held by such subsidiary or subsidiaries, except
where such sale, lease, transfer, exclusive license or other disposition is to a wholly owned subsidiary of the Company. 

1.21    “SEC” means the Securities and Exchange Commission. 

 1.22    “SEC Rule 144” means Rule 144 promulgated by
the SEC under the Securities Act. 
 1.23    “SEC Rule 145” means Rule 145 promulgated by the SEC under
the Securities Act. 
 1.24    “Securities Act” means the Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder. 
 1.25    “Selling Expenses” means all underwriting
discounts, selling commissions, and stock transfer taxes applicable to the sale of Registrable Securities, and fees and disbursements of counsel for any Holder, except for the fees and disbursements of the Selling Holder Counsel (as defined herein)
borne and paid by the Company as provided in Section 2.6. 
 2.    Registration Rights. The Company
covenants and agrees as follows: 
 2.1    Demand Registration. 

(a)    Form S-1 Demand. If at any time after one hundred eighty
(180) days after the effective date of the registration statement for the IPO, the Company receives a request from Holders of at least a majority of the Registrable Securities then outstanding that the Company file a Form S-1 registration statement with respect to outstanding Registrable Securities of such Holders having an anticipated aggregate offering price of at least $10 million (prior to deduction of Selling Expenses),
then the Company shall: (i) within ten (10) days after the date such request is given, give notice thereof (the “Demand Notice”) to all Holders other than the Initiating Holders; and (ii) as soon as practicable, and
in any event within sixty (60) days after the date such request is given by the Initiating Holders, file a Form S-1 registration statement under the Securities Act covering all Registrable Securities that
the Initiating Holders requested to be registered and any additional Registrable Securities requested to be included in such registration by any other Holders, as specified by notice given by each such Holder to the Company within twenty
(20) days after the date the Demand Notice is given, and in each case, subject to the limitations of Section 2.1(c) and Section 2.3. 

(b)    Form S-3 Demand. If at any time when it is eligible
to use a Form S-3 registration statement, the Company receives a request from Holders of at least twenty-five percent (25%) of the Registrable Securities then outstanding that the Company file a Form S-3 registration statement with respect to outstanding Registrable Securities of such Holders having an anticipated aggregate offering price of at least $3.0 million (prior to deduction of Selling Expenses),
then the Company shall: (i) within ten (10) days after the date such request is given, give a Demand Notice to all Holders other than the Initiating Holders; and (ii) as soon as practicable, and in any event within forty-five
(45) days after the date such request is given by the Initiating Holders, file a Form S-3 registration statement under the Securities Act covering all Registrable Securities that the Initiating Holders
requested to be registered and any additional Registrable Securities requested to be included in such registration by any other Holders, as specified by notice given by each such Holder to the Company within twenty (20) days after the date the
Demand Notice is given, and in each case, subject to the limitations of Section 2.1(c) and Section 2.3. 

 (c)    Notwithstanding the foregoing obligations, if the Company
furnishes to Holders requesting a registration pursuant to this Section 2.1 a certificate signed by the Company’s chief executive officer or other most senior executive officer stating that in the good faith judgment
of the Board of Directors it would be materially detrimental to the Company and its stockholders for such registration statement to either become effective or remain effective for as long as such registration statement otherwise would be required to
remain effective, because such action would: (i) materially interfere with a significant acquisition, corporate reorganization, or other similar transaction involving the Company; (ii) require premature disclosure of material information
that the Company has a bona fide business purpose for preserving as confidential; or (iii) render the Company unable to comply with requirements under the Securities Act or Exchange Act, then the Company shall have the right to defer taking
action with respect to such filing, and any time periods with respect to filing or effectiveness thereof shall be tolled correspondingly, for a period of not more than sixty (60) days after the request of the Initiating Holders is given;
provided, however, that the Company may not invoke this right more than twice in any twelve (12) month period; and provided further that the Company shall not register any securities for its own account or that of any other
stockholder during such sixty (60) day period other than an Excluded Registration. 
 (d)    The Company shall not
be obligated to effect, or to take any action to effect, any registration pursuant to Section 2.1(a): (i) during the period that is sixty (60) days before the Company’s good faith estimate of the date of filing of, and ending
on a date that is one hundred eighty (180) days after the effective date of, a Company-initiated registration; provided, that the Company is actively employing in good faith commercially reasonable efforts to cause such registration
statement to become effective; (ii) if the Company has effected two (2) demand registrations pursuant to Section 2.1(a); or (iii) if the Initiating Holders propose to dispose of shares of Registrable Securities that may be
immediately registered on Form S-3 pursuant to a request made pursuant to Section 2.1(b). The Company shall not be obligated to effect, or to take any action to effect, any registration pursuant to
Section 2.1(b): (A) during the period that is thirty (30) days before the Company’s good faith estimate of the date of filing of, and ending on a date that is ninety (90) days after the effective date of, a
Company-initiated registration; provided, that the Company is actively employing in good faith commercially reasonable efforts to cause such registration statement to become effective; or (B) if the Company has effected two
(2) registrations pursuant to Section 2.1(b) within the twelve (12) month period immediately preceding the date of such request. A registration shall not be counted as “effected” for purposes of this
Section 2.1(d) until such time as the applicable registration statement has been declared effective by the SEC, unless the Initiating Holders withdraw their request for such registration, elect not to pay the registration expenses
therefor, and forfeit their right to one (1) demand registration statement pursuant to Section 2.6, in which case such withdrawn registration statement shall be counted as “effected” for purposes of this
Section 2.1(d). 
 2.2    Company Registration. If the Company proposes to register (including, for
this purpose, a registration effected by the Company for stockholders other than the Holders) any of its securities under the Securities Act in connection with the public offering of such 

 
securities solely for cash (other than in an Excluded Registration), the Company shall, at such time, promptly give each Holder notice of such registration. Upon the request of each Holder given
within twenty (20) days after such notice is given by the Company, the Company shall, subject to the provisions of Section 2.3, cause to be registered all of the Registrable Securities that each such Holder has
requested to be included in such registration. The Company shall have the right to terminate or withdraw any registration initiated by it under this Section 2.2 before the effective date of such registration, whether or not
any Holder has elected to include Registrable Securities in such registration. The expenses (other than Selling Expenses) of such withdrawn registration shall be borne by the Company in accordance with Section 2.6. 

2.3    Underwriting Requirements. 

(a)    If, pursuant to Section 2.1, the Initiating Holders intend to distribute the Registrable
Securities covered by their request by means of an underwriting, they shall so advise the Company as a part of their request made pursuant to Section 2.1, and the Company shall include such information in the Demand Notice.
The underwriter(s) will be selected by the Company and shall be reasonably acceptable to a majority in interest of the Initiating Holders. In such event, the right of any Holder to include such Holder’s Registrable Securities in such
registration shall be conditioned upon such Holder’s participation in such underwriting and the inclusion of such Holder’s Registrable Securities in the underwriting to the extent provided herein. All Holders proposing to distribute their
securities through such underwriting shall (together with the Company as provided in Section 2.4(e)) enter into an underwriting agreement in customary form with the underwriter(s) selected for such underwriting.
Notwithstanding any other provision of this Section 2.3, if the managing underwriter(s) advise(s) the Initiating Holders in writing that marketing factors require a limitation on the number of shares to be underwritten,
then the Initiating Holders shall so advise all Holders of Registrable Securities that otherwise would be underwritten pursuant hereto, and the number of Registrable Securities that may be included in the underwriting shall be allocated among such
Holders of Registrable Securities, including the Initiating Holders, in proportion (as nearly as practicable) to the number of Registrable Securities owned by each Holder or in such other proportion as shall mutually be agreed to by all such selling
Holders; provided, however, that the number of Registrable Securities held by the Holders to be included in such underwriting shall not be reduced unless all other securities of the Company are first entirely excluded from the
underwriting. To facilitate the allocation of shares in accordance with the above provisions, the Company or the underwriters may round the number of shares allocated to any Holder to the nearest one hundred (100) shares. 

(b)    In connection with any offering involving an underwriting of shares of the Company’s capital stock pursuant
to Section 2.2, the Company shall not be required to include any of the Holders’ Registrable Securities in such underwriting unless the Holders accept the terms of the underwriting as agreed upon between the Company
and its underwriters, and then only in such quantity as the underwriters in their sole discretion determine will not jeopardize the success of the offering by the Company. If the total number of securities, including Registrable Securities,
requested by stockholders to be included in such offering exceeds the number of securities to be sold (other than by the Company) that the underwriters in their reasonable discretion determine is compatible with the success of the offering, then the

 
Company shall be required to include in the offering only that number of such securities, including Registrable Securities, which the underwriters and the Company in their sole discretion
determine will not jeopardize the success of the offering. If the underwriters determine that less than all of the Registrable Securities requested to be registered can be included in such offering, then the Registrable Securities that are included
in such offering shall be allocated among the selling Holders in proportion (as nearly as practicable to) the number of Registrable Securities owned by each selling Holder or in such other proportions as shall mutually be agreed to by all such
selling Holders. To facilitate the allocation of shares in accordance with the above provisions, the Company or the underwriters may round the number of shares allocated to any Holder to the nearest one hundred (100) shares. Notwithstanding the
foregoing, in no event shall (i) the number of Registrable Securities included in the offering be reduced unless all other securities (other than securities to be sold by the Company) are first entirely excluded from the offering or
(ii) the number of Registrable Securities included in the offering be reduced below thirty percent (30%) of the total number of securities included in such offering, unless such offering is the IPO, in which case the selling Holders may be
excluded further if the underwriters make the determination described above and no other stockholder’s securities are included in such offering. For purposes of the provisions in this Section 2.3(b) and
Section 2.3(a) concerning apportionment, for any selling Holder that is a partnership, limited liability company, or corporation, the partners, members, retired partners, retired members, stockholders, and Affiliates of
such Holder, or the estates and Immediate Family Members of any such partners, retired partners, members, and retired members and any trusts for the benefit of any of the foregoing Persons, shall be deemed to be a single “selling Holder,”
and any pro rata reduction with respect to such “selling Holder” shall be based upon the aggregate number of Registrable Securities owned by all Persons included in such “selling Holder,” as defined in this sentence. 

(c)    For purposes of Section 2.1, a registration shall not be counted as “effected”
if, as a result of an exercise of the underwriter’s cutback provisions in Section 2.3(a), fewer than fifty percent (50%) of the total number of Registrable Securities that Holders have requested to be included in such
registration statement are actually included. 
 2.4    Obligations of the Company. Whenever required under this
Section 2 to effect the registration of any Registrable Securities, the Company shall, as expeditiously as reasonably possible: 

(a)    prepare and file with the SEC a registration statement with respect to such Registrable Securities and use its
commercially reasonable efforts to cause such registration statement to become effective and, upon the request of the Holders of a majority of the Registrable Securities registered thereunder, keep such registration statement effective for a period
of up to one hundred twenty (120) days or, if earlier, until the distribution contemplated in the registration statement has been completed; provided, however, that (i) such one hundred twenty (120) day period shall be
extended for a period of time equal to the period the Holder refrains, at the request of an underwriter of Common Stock (or other securities) of the Company, from selling any securities included in such registration, and (ii) in the case of any
registration of Registrable Securities on Form S-3 that are intended to be offered on a continuous or delayed basis, subject to compliance with applicable SEC rules, such one hundred twenty (120) day
period shall be extended for up to sixty (60) days, if necessary, to keep the registration statement effective until all such Registrable Securities are sold; 

 (b)    prepare and file with the SEC such amendments and supplements to
such registration statement, and the prospectus used in connection with such registration statement, as may be necessary to comply with the Securities Act in order to enable the disposition of all securities covered by such registration statement;

 (c)    furnish to the selling Holders such numbers of copies of a prospectus, including a preliminary prospectus, as
required by the Securities Act, and such other documents as the Holders may reasonably request in order to facilitate their disposition of their Registrable Securities; 

(d)    use its commercially reasonable efforts to register and qualify the securities covered by such registration
statement under such other securities or blue-sky laws of such jurisdictions as shall be reasonably requested by the selling Holders; provided that the Company shall not be required to qualify to do
business or to file a general consent to service of process in any such states or jurisdictions, unless the Company is already subject to service in such jurisdiction and except as may be required by the Securities Act; 

(e)    in the event of any underwritten public offering, enter into and perform its obligations under an underwriting
agreement, in usual and customary form, with the underwriter(s) of such offering; 
 (f)    use its commercially
reasonable efforts to cause all such Registrable Securities covered by such registration statement to be listed on a national securities exchange or trading system and each securities exchange and trading system (if any) on which similar securities
issued by the Company are then listed; 
 (g)    provide a transfer agent and registrar for all Registrable Securities
registered pursuant to this Agreement and provide a CUSIP number for all such Registrable Securities, in each case not later than the effective date of such registration; 

(h)    promptly make available for inspection by the selling Holders, any managing underwriter(s) participating in any
disposition pursuant to such registration statement, and any attorney or accountant or other agent retained by any such underwriter or selected by the selling Holders, all financial and other records, pertinent corporate documents, and properties of
the Company, and cause the Company’s officers, directors, employees, and independent accountants to supply all information reasonably requested by any such seller, underwriter, attorney, accountant, or agent, in each case, as necessary or
advisable to verify the accuracy of the information in such registration statement and to conduct appropriate due diligence in connection therewith; 

(i)    notify each selling Holder, promptly after the Company receives notice thereof, of the time when such registration
statement has been declared effective or a supplement to any prospectus forming a part of such registration statement has been filed; and 

 (j)    after such registration statement becomes effective, notify each
selling Holder of any request by the SEC that the Company amend or supplement such registration statement or prospectus. 
 In addition, the
Company shall ensure that, at all times after any registration statement covering a public offering of securities of the Company under the Securities Act shall have become effective, its insider trading policy shall provide that the Company’s
executive officers and directors may implement a trading program under Rule 10b5-1 of the Exchange Act. 

2.5    Furnish Information. It shall be a condition precedent to the obligations of the Company to take any action
pursuant to this Section 2 with respect to the Registrable Securities of any selling Holder that such Holder shall furnish to the Company such information regarding itself, the Registrable Securities held by it, and the
intended method of disposition of such securities as is reasonably required to effect the registration of such Holder’s Registrable Securities. 

2.6    Expenses of Registration. All expenses (other than Selling Expenses) incurred in connection with
registrations, filings, or qualifications pursuant to Section 2, including all registration, filing, and qualification fees; printers’ and accounting fees; fees and disbursements of counsel for the Company; and the
reasonable fees and disbursements, not to exceed $50,000.00, of one counsel for the selling Holders (the “Selling Holder Counsel”), shall be borne and paid by the Company; provided, however, that the Company shall not
be required to pay for any expenses of any registration proceeding begun pursuant to Section 2.1 if the registration request is subsequently withdrawn at the request of the Holders of at least a majority of the Registrable
Securities to be registered (in which case all selling Holders shall bear such expenses pro rata based upon the number of Registrable Securities that were to be included in the withdrawn registration), unless the Holders of at least a majority of
the Registrable Securities agree to forfeit their right to one registration pursuant to Section 2.1(a) or Section 2.1(b), as the case may be; provided, further that if, at the time of
such withdrawal, the Holders shall have learned of a material adverse change in the condition, business, or prospects of the Company from that known to the Holders at the time of their request and have withdrawn the request with reasonable
promptness after learning of such information then the Holders shall not be required to pay any of such expenses and shall not forfeit their right to one registration pursuant to Section 2.1(a) or
Section 2.1(b). All Selling Expenses relating to Registrable Securities registered pursuant to this Section 2 shall be borne and paid by the Holders pro rata on the basis of the number of
Registrable Securities registered on their behalf. 
 2.7    Delay of Registration. No Holder shall have any
right to obtain or seek an injunction restraining or otherwise delaying any registration pursuant to this Agreement as the result of any controversy that might arise with respect to the interpretation or implementation of this
Section 2. 
 2.8    Indemnification. If any Registrable Securities are included in a
registration statement under this Section 2: 
 (a)    To the extent permitted by law, the
Company will indemnify and hold harmless each selling Holder, and the partners, members, officers, directors, and 

 
stockholders of each such Holder; legal counsel and accountants for each such Holder; any underwriter (as defined in the Securities Act) for each such Holder; and each Person, if any, who
controls such Holder or underwriter within the meaning of the Securities Act or the Exchange Act, against any Damages, and the Company will pay to each such Holder, underwriter, controlling Person, or other aforementioned Person any legal or other
expenses reasonably incurred thereby in connection with investigating or defending any claim or proceeding from which Damages may result, as such expenses are incurred; provided, however, that the indemnity agreement contained in this
Section 2.8(a) shall not apply to amounts paid in settlement of any such claim or proceeding if such settlement is effected without the consent of the Company, which consent shall not be unreasonably withheld, nor shall the
Company be liable for any Damages to the extent that they arise out of or are based upon actions or omissions made in reliance upon and in conformity with written information furnished by or on behalf of any such Holder, underwriter, controlling
Person, or other aforementioned Person expressly for use in connection with such registration. 
 (b)    To the extent
permitted by law, each selling Holder, severally and not jointly, will indemnify and hold harmless the Company, and each of its directors, each of its officers who has signed the registration statement, each Person (if any), who controls the Company
within the meaning of the Securities Act, legal counsel and accountants for the Company, any underwriter (as defined in the Securities Act), any other Holder selling securities in such registration statement, and any controlling Person of any such
underwriter or other Holder, against any Damages, in each case only to the extent that such Damages arise out of or are based upon actions or omissions made in reliance upon and in conformity with written information furnished by or on behalf of
such selling Holder expressly for use in connection with such registration; and each such selling Holder will pay to the Company and each other aforementioned Person any legal or other expenses reasonably incurred thereby in connection with
investigating or defending any claim or proceeding from which Damages may result, as such expenses are incurred; provided, however, that the indemnity agreement contained in this Section 2.8(b) shall not apply to amounts
paid in settlement of any such claim or proceeding if such settlement is effected without the consent of the Holder, which consent shall not be unreasonably withheld; and provided, further that in no event shall the aggregate amounts
payable by any Holder by way of indemnity or contribution under Sections 2.8(b) and 2.8(d) exceed the proceeds from the offering received by such Holder (net of any Selling Expenses paid by such Holder), except in the case of fraud or
willful misconduct by such Holder. 
 (c)    Promptly after receipt by an indemnified party under this
Section 2.8 of notice of the commencement of any action (including any governmental action) for which a party may be entitled to indemnification hereunder, such indemnified party will, if a claim in respect thereof is to be
made against any indemnifying party under this Section 2.8, give the indemnifying party notice of the commencement thereof. The indemnifying party shall have the right to participate in such action and, to the extent the
indemnifying party so desires, participate jointly with any other indemnifying party to which notice has been given, and to assume the defense thereof with counsel mutually satisfactory to the parties; provided, however, that an
indemnified party (together with all other indemnified parties that may be represented without conflict by one counsel) shall have the right to retain one separate counsel, with the fees and expenses to be paid by the indemnifying party, if
representation of such indemnified party by 

 
the counsel retained by the indemnifying party would be inappropriate due to actual or potential differing interests between such indemnified party and any other party represented by such counsel
in such action. The failure to give notice to the indemnifying party within a reasonable time of the commencement of any such action shall relieve such indemnifying party of any liability to the indemnified party under this
Section 2.8, to the extent that such failure materially prejudices the indemnifying party’s ability to defend such action. The failure to give notice to the indemnifying party will not relieve it of any liability that
it may have to any indemnified party otherwise than under this Section 2.8. 
 (d)    To provide for just
and equitable contribution to joint liability under the Securities Act in any case in which either (i) any party otherwise entitled to indemnification hereunder makes a claim for indemnification pursuant to this Section 2.8 but it
is judicially determined (by the entry of a final judgment or decree by a court of competent jurisdiction and the expiration of time to appeal or the denial of the last right of appeal) that such indemnification may not be enforced in such case,
notwithstanding the fact that this Section 2.8 provides for indemnification in such case, or (ii) contribution under the Securities Act may be required on the part of any party hereto for which indemnification is provided under this
Section 2.8, then, and in each such case, such parties will contribute to the aggregate losses, claims, damages, liabilities, or expenses to which they may be subject (after contribution from others) in such proportion as is appropriate
to reflect the relative fault of each of the indemnifying party and the indemnified party in connection with the statements, omissions, or other actions that resulted in such loss, claim, damage, liability, or expense, as well as to reflect any
other relevant equitable considerations. The relative fault of the indemnifying party and of the indemnified party shall be determined by reference to, among other things, whether the untrue or allegedly untrue statement of a material fact, or the
omission or alleged omission of a material fact, relates to information supplied by the indemnifying party or by the indemnified party and the parties’ relative intent, knowledge, access to information, and opportunity to correct or prevent
such statement or omission; provided, however, that, in any such case, (x) no Holder will be required to contribute any amount in excess of the public offering price of all such Registrable Securities offered and sold by such
Holder pursuant to such registration statement, and (y) no Person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) will be entitled to contribution from any Person who was not guilty of
such fraudulent misrepresentation; and provided, further, that in no event shall a Holder’s liability pursuant to this Section 2.8(d), when combined with the amounts paid or payable by such Holder pursuant to
Section 2.8(b), exceed the proceeds from the offering received by such Holder (net of any Selling Expenses paid by such Holder), except in the case of willful misconduct or fraud by such Holder. 

(e)    Notwithstanding the foregoing, to the extent that the provisions on indemnification and contribution contained in
the underwriting agreement entered into in connection with the underwritten public offering are in conflict with the foregoing provisions, the provisions in the underwriting agreement shall control. 

(f)    Unless otherwise superseded by an underwriting agreement entered into in connection with the underwritten public
offering, the obligations of the Company and Holders under this Section 2.8 shall survive the completion of any offering of Registrable Securities in a registration under this Section 2, and otherwise shall
survive the termination of this Agreement. 

 2.9    Reports Under Exchange Act. With a view to making
available to the Holders the benefits of SEC Rule 144 and any other rule or regulation of the SEC that may at any time permit a Holder to sell securities of the Company to the public without registration or pursuant to a registration on Form S-3, the Company shall: 
 (a)    make and keep available adequate current public
information, as those terms are understood and defined in SEC Rule 144, at all times after the effective date of the registration statement filed by the Company for the IPO; 

(b)    use commercially reasonable efforts to file with the SEC in a timely manner all reports and other documents
required of the Company under the Securities Act and the Exchange Act (at any time after the Company has become subject to such reporting requirements); and 

(c)    furnish to any Holder, so long as the Holder owns any Registrable Securities, forthwith upon request: (i) to
the extent accurate, a written statement by the Company that it has complied with the reporting requirements of SEC Rule 144 (at any time after ninety (90) days after the effective date of the registration statement filed by the Company for the
IPO), the Securities Act, and the Exchange Act (at any time after the Company has become subject to such reporting requirements), or that it qualifies as a registrant whose securities may be resold pursuant to Form
S-3 (at any time after the Company so qualifies); (ii) a copy of the most recent annual or quarterly report of the Company and such other reports and documents so filed by the Company; and (iii) such
other information as may be reasonably requested in availing any Holder of any rule or regulation of the SEC that permits the selling of any such securities without registration (at any time after the Company has become subject to the reporting
requirements under the Exchange Act) or pursuant to Form S-3 (at any time after the Company so qualifies to use such form). 

2.10    Limitations on Subsequent Registration Rights. From and after the date of this Agreement, the Company shall
not, without the prior written consent of the Holders of at least a majority of the Registrable Securities then outstanding, enter into any agreement with any holder or prospective holder of any securities of the Company that would provide to such
holder the right to include securities in any registration on other than on a subordinate basis after all Holders have had the opportunity to include in the registration and offering all shares of Registrable Securities that they wish to so include.

 2.11    “Market Stand-off”
Agreement. Each Holder hereby agrees that it will not, without the prior written consent of the managing underwriter, during the period commencing on the date of the final prospectus relating to the registration by the Company of shares of
Common Stock in its IPO, and ending on the date specified by the Company and the managing underwriter (such period not to exceed one hundred eighty (180) days), (i) lend, offer, pledge, sell, contract to sell, sell any option or contract to
purchase, purchase any option or contract to sell, grant any option, right, or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or
exchangeable 

 
(directly or indirectly) for Common Stock held immediately before the effective date of the registration statement for the IPO or (ii) enter into any swap or other arrangement that transfers
to another, in whole or in part, any of the economic consequences of ownership of such securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Common Stock or other securities, in cash, or
otherwise. The foregoing provisions of this Section 2.11 shall only apply to the IPO, shall not apply to the sale of any shares to an underwriter pursuant to an underwriting agreement, or the transfer of any shares to any
trust for the direct or indirect benefit of the Holder or an Immediate Family Member of the Holder, provided that the trustee of the trust agrees to be bound in writing by the restrictions set forth herein, and provided further that any such
transfer shall not involve a disposition for value, and shall be applicable to the Holders only if all officers and directors are subject to the same restrictions and the Company obtains a similar agreement from all stockholders (individually and
together with their Affiliates) owning one percent (1%) or more of the Company’s outstanding Common Stock (after giving effect to conversion into Common Stock of all outstanding shares of the Preferred Stock). The underwriters in connection
with the IPO are intended third party beneficiaries of this Section 2.11 and shall have the right, power, and authority to enforce the provisions hereof as though they were a party hereto. Each Holder further agrees to
execute such agreements as may be reasonably requested by the underwriters in connection with the IPO that are consistent with this Section 2.11 or that are necessary to give further effect thereto. If any of the
obligations described in this Section 2.11 are waived or terminated on a discretionary basis by the Company or any of the underwriters with respect to any of the securities of any such Holder, officer, director or greater
than one-percent stockholder (in any such case, the “Released Securities”), the foregoing provisions shall be waived or terminated, as applicable, to the same extent and with respect to the
same percentage of securities of each Holder as the percentage of Released Securities represent with respect to the securities held by the applicable Holder, officer, director or greater than one-percent
stockholder that are subject to such obligations. 
 2.12    Restrictions on Transfer. 

(a)    The Preferred Stock and the Registrable Securities shall not be sold, pledged, or otherwise transferred, and the
Company shall not recognize and shall issue stop-transfer instructions to its transfer agent with respect to any such sale, pledge, or transfer, except upon the conditions specified in this Agreement, which conditions are intended to ensure
compliance with the provisions of the Securities Act. A transferring Holder will cause any proposed purchaser, pledgee, or transferee of the Preferred Stock and the Registrable Securities held by such Holder to agree to take and hold such securities
subject to the provisions and upon the conditions specified in this Agreement. 
 (b)    Each certificate or instrument
representing (i) the Preferred Stock, (ii) the Registrable Securities, and (iii) any other securities issued in respect of the securities referenced in clauses (i) and (ii), upon any stock split, stock dividend,
recapitalization, merger, consolidation, or similar event, shall (unless otherwise permitted by the provisions of Section 2.12(c)) be stamped or otherwise imprinted with legends substantially in the following forms: 

THE SECURITIES REPRESENTED HEREBY HAVE BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE

 
SECURITIES ACT OF 1933. SUCH SHARES MAY NOT BE SOLD, PLEDGED, OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR A VALID EXEMPTION FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF
SAID ACT. 
 THE SECURITIES REPRESENTED HEREBY MAY BE TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF AN AGREEMENT OR AGREEMENTS BETWEEN THE
COMPANY AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. 
 The Holders consent to the Company making a notation in its
records and giving instructions to any transfer agent of the Restricted Securities in order to implement the restrictions on transfer set forth in this Section 2.12. 

(c)    The holder of each certificate representing Restricted Securities, by acceptance thereof, agrees to comply in all
respects with the provisions of this Section 2. Before any proposed sale, pledge, or transfer of any Restricted Securities, unless there is in effect a registration statement under the Securities Act covering the proposed
transaction, the Holder thereof shall give notice to the Company of such Holder’s intention to effect such sale, pledge, or transfer. Each such notice shall describe the manner and circumstances of the proposed sale, pledge, or transfer in
sufficient detail and, if reasonably requested by the Company, shall be accompanied at such Holder’s expense by either: (i) a written opinion of legal counsel who shall, and whose legal opinion shall, be reasonably satisfactory to the
Company, addressed to the Company, to the effect that the proposed transaction may be effected without registration under the Securities Act; (ii) a “no action” letter from the SEC to the effect that the proposed sale, pledge, or
transfer of such Restricted Securities without registration will not result in a recommendation by the staff of the SEC that action be taken with respect thereto; or (iii) any other evidence reasonably satisfactory to counsel to the Company to
the effect that the proposed sale, pledge, or transfer of the Restricted Securities may be effected without registration under the Securities Act, whereupon the Holder of such Restricted Securities shall be entitled to sell, pledge, or transfer such
Restricted Securities in accordance with the terms of the notice given by the Holder to the Company. The Company will not require such a legal opinion or “no action” letter (x) in any transaction in compliance with SEC Rule 144 or
(y) in any transaction in which such Holder distributes Restricted Securities to an Affiliate of such Holder for no consideration; provided that each transferee agrees in writing to be subject to the terms of this
Section 2.12. Each certificate or instrument evidencing the Restricted Securities transferred as above provided shall bear, except if such transfer is made pursuant to SEC Rule 144, the appropriate restrictive legend set
forth in Section 2.12(b), except that such certificate shall not bear such restrictive legend if, in the opinion of counsel for such Holder and the Company, such legend is not required in order to establish compliance with
any provisions of the Securities Act. 
 2.13    Termination of Registration Rights. The right of any Holder to
request registration or inclusion of Registrable Securities in any registration pursuant to Section 2.1 or Section 2.2 shall terminate upon the earliest to occur of: 

(a)    the closing of a Sale Event; 

 (b)    at such time following the IPO when a Holder (and its
Affiliates) holds less than one percent (1%) of the Company’s outstanding Common Stock and all Registrable Securities held by such Holder (and its Affiliates) can be sold in any three (3) month period without registration and limitation in
compliance with SEC Rule 144 or another similar exemption; and 
 (c)    on the fifth (5th) anniversary of the
consummation of the IPO. 
 3.    Financing Documents. If the Company does not consummate an IPO within thirty
(30) days of the date of this Agreement, the Company and the Holders hereby agree to enter into the standard form National Venture Capital Association Voting Agreement, Investors’ Rights Agreement and Right of First Refusal and Co-Sale Agreement, as applicable, on such terms and conditions substantially similar to the terms and conditions in the Third Amended and Restated Limited Liability Company Agreement of Cullinan Oncology, LLC, dated
as of December 16, 2020. 
 4.    Miscellaneous. 

4.1    Successors and Assigns. The rights under this Agreement may be assigned (but only with all related
obligations) by a Holder to a transferee of Registrable Securities that (i) is an Affiliate, partner, member, limited partner, retired partner, retired member, or stockholder of a Holder; or (ii) is a Holder’s Immediate Family Member
or trust for the benefit of an individual Holder or one or more of such Holder’s Immediate Family Members; or (iii) after such transfer, holds at least
[                    ] shares of Registrable Securities (subject to appropriate adjustment for stock splits, stock dividends, combinations, and other
recapitalizations), or, if less, all of the Registrable Securities held by such Holder; provided, however, that (x) the Company is, within a reasonable time after such transfer, furnished with written notice of the name and
address of such transferee and the Registrable Securities with respect to which such rights are being transferred; and (y) such transferee agrees in a written instrument delivered to the Company to be bound by and subject to the terms and
conditions of this Agreement, including the provisions of Section 2.11. For the purposes of determining the number of shares of Registrable Securities held by a transferee, the holdings of a transferee (1) that is an Affiliate,
limited partner, retired partner, member, retired member, or stockholder of a Holder; (2) who is a Holder’s Immediate Family Member; or (3) that is a trust for the benefit of an individual Holder or such Holder’s Immediate Family
Member shall be aggregated together and with those of the transferring Holder; provided further that all transferees who would not qualify individually for assignment of rights shall have a single attorney-in-fact for the purpose of exercising any rights, receiving notices, or taking any action under this Agreement. The terms and conditions of this Agreement inure to the benefit of and are binding upon
the respective successors and permitted assignees of the parties. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and permitted assignees any rights,
remedies, obligations or liabilities under or by reason of this Agreement, except as expressly provided herein. 

 4.2    Governing Law. This Agreement is governed by and shall be
construed in accordance with the law of the State of Delaware, exclusive of its conflict-of-laws principles. 

4.3    Counterparts; Facsimile. This Agreement may be executed and delivered by facsimile
transmission or electronic mail (including in .pdf format) and in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 

4.4    Titles and Subtitles. Titles or captions of Sections contained in this Agreement are inserted as a matter of
convenience and for reference, and in no way define, limit, extend or describe the scope of this Agreement or the intent of any provision hereof. 

4.5    Notices. All notices and other communications given or made pursuant to this Agreement shall be in writing
and shall be deemed effectively given upon the earlier of actual receipt or: (a) upon personal delivery to the party to be notified; (b) when sent, if sent by electronic mail or facsimile during the recipient’s normal business hours,
and if not sent during normal business hours, then on the recipient’s next business day; (c) five (5) days after having been sent by registered or certified mail, return receipt requested, postage prepaid; or (d) one (1) business day
after the business day of deposit with a nationally recognized overnight courier, freight prepaid, specifying next-day delivery, with written verification of receipt. All communications shall be sent to the
respective parties at their addresses as set forth on Schedule A hereto, or to the principal office of the Company and to the attention of the President or Chief Executive Officer, in the case of the Company, or to such
email address, facsimile number, or address as subsequently modified by written notice given in accordance with this Section 4.5. If notice is given to the Company, a copy (which shall not constitute notice) shall also be
sent to Mitchell S. Bloom and Danielle Lauzon, Goodwin Procter LLP, 100 Northern Avenue, Boston, MA 02210. 

4.6    Amendments and Waivers. Any term of this Agreement may be amended and the observance of any term of this
Agreement may be waived (either generally or in a particular instance, and either retroactively or prospectively) only with the written consent of the Company and the holders of at least a majority of the Registrable Securities then outstanding;
provided that the Company may in its sole discretion waive compliance with Section 2.12(c) (and the Company’s failure to object promptly in writing after notification of a proposed assignment allegedly in
violation of Section 2.12(c) shall be deemed to be a waiver); and provided further that any provision hereof may be waived by any waiving party on such party’s own behalf, without the consent of any other party.
Notwithstanding the foregoing, this Agreement may not be amended, modified or terminated and the observance of any term hereof may not be waived with respect to any Investor without the written consent of such Investor, unless such amendment,
modification, termination, or waiver applies to all Investors in the same fashion. The Company shall give prompt notice of any amendment or termination hereof or waiver hereunder to any party hereto that did not consent in writing to such amendment,
termination, or waiver. Any amendment, termination, or waiver effected in accordance with this Section 4.6 shall be binding on all parties hereto, regardless of whether any such party has consented thereto. No waivers of or
exceptions to any term, condition, or provision of this Agreement, in any one or more instances, shall be deemed to be or construed as a further or continuing waiver of any such term, condition, or provision. 

 4.7    Severability. In case any one or more of the provisions
contained in this Agreement is for any reason held to be invalid, illegal or unenforceable in any respect, such invalidity, illegality, or unenforceability shall not affect any other provision of this Agreement, and such invalid, illegal, or
unenforceable provision shall be reformed and construed so that it will be valid, legal, and enforceable to the maximum extent permitted by law. 

4.8    Aggregation of Stock. All shares of Registrable Securities held or acquired by Affiliates shall be
aggregated together for the purpose of determining the availability of any rights under this Agreement and such Affiliated persons may apportion such rights as among themselves in any manner they deem appropriate. 

4.9    Entire Agreement. This Agreement (including any Schedules hereto) constitutes the full and entire
understanding and agreement among the parties with respect to the subject matter hereof, and any other written or oral agreement relating to the subject matter hereof existing between the parties is expressly canceled. 

4.11    Delays or Omissions. No delay or omission to exercise any right, power, or remedy accruing to any party
under this Agreement, upon any breach or default of any other party under this Agreement, shall impair any such right, power, or remedy of such nonbreaching or nondefaulting party, nor shall it be construed to be a waiver of or acquiescence to any
such breach or default, or to any similar breach or default thereafter occurring, nor shall any waiver of any single breach or default be deemed a waiver of any other breach or default theretofore or thereafter occurring. All remedies, whether under
this Agreement or by law or otherwise afforded to any party, shall be cumulative and not alternative. 

4.12    Further Assurances. At any time or from time to time after the date hereof, the parties agree to
cooperate with each other, and at the request of any other party, to execute and deliver any further instruments or documents and to take all such further action as the other party may reasonably request in order to evidence or effectuate the
consummation of the transactions contemplated hereby and to otherwise carry out the intent of the parties hereunder. 

4.13    Acknowledgment. The Company acknowledges that the Investors are in the business of venture capital
investing and therefore review the business plans and related proprietary information of many enterprises, including enterprises which may have products or services which compete directly or indirectly with those of the Company. Nothing in this
Agreement shall preclude or in any way restrict the Investors from investing or participating in any particular enterprise whether or not such enterprise has products or services which compete with those of the Company. 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

			
	CULLINAN MANAGEMENT, INC.
		
	By:	 	
                     
                                       

		
	Name:	 	  

		
	Title:	 	  

	
	Address:
	
	  

	
	  

	
	  

		
	Email:	 	  

  
 [Signature Page to
Registration Rights Agreement] 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

			
	INVESTORS:
	
	[INVESTOR NAME]
		
	By:	 	
                     
                   

		
	Name:	 	  

		
	Title:	 	  

	
	[INVESTOR NAME]
		
	By:	 	
                     
                   

		
	Name:	 	  

		
	Title:	 	  

  
 [Signature Page to
Registration Rights Agreement]EX-10.1

 Exhibit 10.1 

CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 

SECTION 1. GENERAL PURPOSE OF THE PLAN; DEFINITIONS 

The name of the plan is the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan (the “Plan”). The purpose of the Plan is
to encourage and enable the employees, Non-Employee Directors and Consultants of Cullinan Management, Inc. (the “Company”) and its Affiliates upon whose judgment, initiative and efforts the Company
largely depends for the successful conduct of its business to acquire a proprietary interest in the Company. It is anticipated that providing such persons with a direct stake in the Company’s welfare will assure a closer identification of their
interests with those of the Company and its stockholders, thereby stimulating their efforts on the Company’s behalf and strengthening their desire to remain with the Company. 

The following terms shall be defined as set forth below: 

“Act” means the Securities Act of 1933, as amended, and the rules and regulations thereunder. 

“Administrator” means either the Board or the compensation committee of the Board or a similar committee performing the
functions of the compensation committee and which is comprised of not less than two Non-Employee Directors who are independent. 

“Affiliate” means, at the time of determination, any “parent” or “subsidiary” of the Company as such
terms are defined in Rule 405 of the Act. The Board will have the authority to determine the time or times at which “parent” or “subsidiary” status is determined within the foregoing definition. 

“Award” or “Awards,” except where referring to a particular category of grant under the Plan, shall include
Incentive Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Units, Restricted Stock Awards, Unrestricted Stock Awards, Cash-Based Awards, and Dividend Equivalent Rights.

 “Award Certificate” means a written or electronic document setting forth the terms and provisions applicable to an Award
granted under the Plan. Each Award Certificate is subject to the terms and conditions of the Plan. 
 “Board” means the
Board of Directors of the Company. 
 “Cash-Based Award” means an Award entitling the recipient to receive a
cash-denominated payment. 
 “Code” means the Internal Revenue Code of 1986, as amended, and any successor Code, and
related rules, regulations and interpretations. 
  

 “Consultant” means a consultant or adviser who provides bona fide
services to the Company or an Affiliate as an independent contractor and who qualifies as a consultant or advisor under Instruction A.1.(a)(1) of Form S-8 under the Act. 

“Dividend Equivalent Right” means an Award entitling the grantee to receive credits based on cash dividends that would have
been paid on the shares of Stock specified in the Dividend Equivalent Right (or other award to which it relates) if such shares had been issued to and held by the grantee. 

“Effective Date” means the date on which the Plan becomes effective as set forth in Section 19. 

“Exchange Act” means the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder. 

“Fair Market Value” of the Stock on any given date means the fair market value of the Stock determined in good faith by the
Administrator; provided, however, that if the Stock is listed on the National Association of Securities Dealers Automated Quotation System (“NASDAQ”), NASDAQ Global Market, The New York Stock Exchange or another national securities
exchange or traded on any established market, the determination shall be made by reference to market quotations. If there are no market quotations for such date, the determination shall be made by reference to the last date preceding such date for
which there are market quotations; provided further, however, that if the date for which Fair Market Value is determined is the Registration Date, the Fair Market Value shall be the “Price to the Public” (or equivalent) set forth on the
cover page for the final prospectus relating to the Company’s initial public offering. 
 “Incentive Stock Option”
means any Stock Option designated and qualified as an “incentive stock option” as defined in Section 422 of the Code. 
 “Non-Employee Director” means a member of the Board who is not also an employee of the Company or any Subsidiary. 

“Non-Qualified Stock Option” means any Stock Option that is not an Incentive Stock
Option. 
 “Option” or “Stock Option” means any option to purchase shares of Stock granted pursuant to
Section 5. 
 “Registration Date” means the date upon which the registration statement on Form S-1 that is filed by the Company with respect to its initial public offering is declared effective by the Securities and Exchange Commission. 

“Restricted Shares” means the shares of Stock underlying a Restricted Stock Award that remain subject to a risk of forfeiture
or the Company’s right of repurchase. 
 “Restricted Stock Award” means an Award of Restricted Shares subject to such
restrictions and conditions as the Administrator may determine at the time of grant. 

  
 2 

 “Restricted Stock Units” means an Award of stock units subject to such
restrictions and conditions as the Administrator may determine at the time of grant. 
 “Sale Event” shall mean
(i) the sale of all or substantially all of the assets of the Company on a consolidated basis to an unrelated person or entity, (ii) a merger, reorganization or consolidation pursuant to which the holders of the Company’s outstanding
voting power and outstanding stock immediately prior to such transaction do not own a majority of the outstanding voting power and outstanding stock or other equity interests of the resulting or successor entity (or its ultimate parent, if
applicable) immediately upon completion of such transaction, (iii) the sale of all of the Stock of the Company to an unrelated person, entity or group thereof acting in concert, or (iv) any other transaction in which the owners of the
Company’s outstanding voting power immediately prior to such transaction do not own at least a majority of the outstanding voting power of the Company or any successor entity immediately upon completion of the transaction other than as a result
of the acquisition of securities directly from the Company. 
 “Sale Price” means the value as determined by the
Administrator of the consideration payable, or otherwise to be received by stockholders, per share of Stock pursuant to a Sale Event. 

“Section 409A” means Section 409A of the Code and the regulations and other guidance promulgated
thereunder. 
 “Service Relationship” means any relationship as an employee,
Non-Employee Director or Consultant of the Company or any Affiliate. Unless as otherwise set forth in the Award Agreement, a Service Relationship shall be deemed to continue without interruption in the event a
grantee’s status changes from full-time employee to part-time employee or a grantee’s status changes from employee to Consultant or Non-Employee Director or vice versa, provided that there is no
interruption or other termination of Service Relationship in connection with the grantee’s change in capacity. 

“Stock” means the Common Stock, par value $0.0001 per share, of the Company, subject to adjustments pursuant to
Section 3. 
 “Stock Appreciation Right” means an Award entitling the recipient to receive shares of Stock (or cash,
to the extent explicitly provided for in the applicable Award Certificate) having a value equal to the excess of the Fair Market Value of the Stock on the date of exercise over the exercise price of the Stock Appreciation Right multiplied by the
number of shares of Stock with respect to which the Stock Appreciation Right shall have been exercised. 
 “Subsidiary”
means any corporation or other entity (other than the Company) in which the Company has at least a 50 percent interest, either directly or indirectly. 

“Ten Percent Owner” means an employee who owns or is deemed to own (by reason of the attribution rules of Section 424(d)
of the Code) more than 10 percent of the combined voting power of all classes of stock of the Company or any parent or subsidiary corporation. 

“Unrestricted Stock Award” means an Award of shares of Stock free of any restrictions. 

  
 3 

 SECTION 2. ADMINISTRATION OF PLAN; ADMINISTRATOR AUTHORITY TO SELECT GRANTEES AND DETERMINE AWARDS

 (a)    Administration of Plan. The Plan shall be administered by the Administrator. 

(b)    Powers of Administrator. The Administrator shall have the power and authority to grant Awards consistent
with the terms of the Plan, including the power and authority: 
 (i)    to select the individuals to whom Awards may
from time to time be granted; 
 (ii)    to determine the time or times of grant, and the extent, if any, of Incentive
Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Awards, Restricted Stock Units, Unrestricted Stock Awards, Cash-Based Awards, and Dividend Equivalent Rights, or any
combination of the foregoing, granted to any one or more grantees; 
 (iii)    to determine the number of shares of
Stock to be covered by any Award; 
 (iv)    to determine and modify from time to time the terms and conditions,
including restrictions, not inconsistent with the terms of the Plan, of any Award, which terms and conditions may differ among individual Awards and grantees, and to approve the forms of Award Certificates; 

(v)    to accelerate at any time the exercisability or vesting of all or any portion of any Award; 

(vi)    subject to the provisions of Section 5(c), to extend at any time the period in which Stock Options may be
exercised; and 
 (vii)    at any time to adopt, alter and repeal such rules, guidelines and practices for
administration of the Plan and for its own acts and proceedings as it shall deem advisable; to interpret the terms and provisions of the Plan and any Award (including related written instruments); to make all determinations it deems advisable for
the administration of the Plan; to decide all disputes arising in connection with the Plan; and to otherwise supervise the administration of the Plan. 

All decisions and interpretations of the Administrator shall be binding on all persons, including the Company and Plan grantees. 

(c)    Delegation of Authority to Grant Awards. Subject to applicable law, the Administrator, in its discretion,
may delegate to a committee consisting of one or more officers of the Company including the Chief Executive Officer of the Company all or part of the Administrator’s authority and duties with respect to the granting of Awards to individuals who
are (i) not subject to the reporting and other provisions of Section 16 of the Exchange Act and (ii) not members of the delegated committee. Any such delegation by the Administrator shall include a limitation as to the amount of Stock
underlying Awards that may be granted during the period of the delegation and shall contain guidelines as to the determination of the exercise price and the vesting criteria. The Administrator may revoke or amend the terms of a delegation at any
time but such action shall not invalidate any prior actions of the Administrator’s delegate or delegates that were consistent with the terms of the Plan. 

  
 4 

 (d)    Award Certificate. Awards under the Plan shall be
evidenced by Award Certificates that set forth the terms, conditions and limitations for each Award which may include, without limitation, the term of an Award and the provisions applicable in the event employment or service terminates. 

(e)    Indemnification. Neither the Board nor the Administrator, nor any member of either or any delegate thereof,
shall be liable for any act, omission, interpretation, construction or determination made in good faith in connection with the Plan, and the members of the Board and the Administrator (and any delegate thereof) shall be entitled in all cases to
indemnification and reimbursement by the Company in respect of any claim, loss, damage or expense (including, without limitation, reasonable attorneys’ fees) arising or resulting therefrom to the fullest extent permitted by law and/or under the
Company’s articles or bylaws or any directors’ and officers’ liability insurance coverage which may be in effect from time to time and/or any indemnification agreement between such individual and the Company. 

(f)    Foreign Award Recipients. Notwithstanding any provision of the Plan to the contrary, in order to comply with
the laws in other countries in which the Company and its Subsidiaries operate or have employees or other individuals eligible for Awards, the Administrator, in its sole discretion, shall have the power and authority to: (i) determine which
Subsidiaries shall be covered by the Plan; (ii) determine which individuals outside the United States are eligible to participate in the Plan; (iii) modify the terms and conditions of any Award granted to individuals outside the United
States to comply with applicable foreign laws; (iv) establish subplans and modify exercise procedures and other terms and procedures, to the extent the Administrator determines such actions to be necessary or advisable (and such subplans and/or
modifications shall be attached to this Plan as appendices); provided, however, that no such subplans and/or modifications shall increase the share limitations contained in Section 3(a) hereof; and (v) take any action, before or after
an Award is made, that the Administrator determines to be necessary or advisable to obtain approval or comply with any local governmental regulatory exemptions or approvals. Notwithstanding the foregoing, the Administrator may not take any
actions hereunder, and no Awards shall be granted, that would violate the Exchange Act or any other applicable United States securities law, the Code, or any other applicable United States governing statute or law. 

SECTION 3. STOCK ISSUABLE UNDER THE PLAN; MERGERS; SUBSTITUTION 

(a)    Stock Issuable. The maximum number of shares of Stock reserved and available for issuance under the Plan
shall be 12,546,386 shares, subject to adjustment as provided in this Section 3, plus on January 1, 2022 and each January 1 thereafter, the number of shares of Stock reserved and available for issuance under the Plan shall be
cumulatively increased by (i) five (5%) percent of the number of shares of Stock issued and outstanding on the immediately preceding December 31 or (ii) such lesser number of shares as determined by the Administrator (the “Annual
Increase”). Subject to such overall limitation, the maximum aggregate number of shares of Stock that may be issued in the form of Incentive Stock Options shall not exceed the Initial Limit cumulatively increased on January 1, 2022 and on
each January 1 thereafter by the 

  
 5 

 
lesser of the Annual Increase for such year or 12,546,386 shares of Stock, subject in all cases to adjustment as provided in Section 3(b). For purposes of this limitation, the shares of
Stock underlying any awards under the Plan that are forfeited, canceled, held back upon exercise of an Option or settlement of an Award to cover the exercise price or tax withholding, reacquired by the Company prior to vesting, satisfied without the
issuance of Stock or otherwise terminated (other than by exercise) shall be added back to the shares of Stock available for issuance under the Plan and, to the extent permitted under Section 422 of the Code and the regulations promulgated
thereunder, the shares of Stock that may be issued as Incentive Stock Options. In the event the Company repurchases shares of Stock on the open market, such shares shall not be added to the shares of Stock available for issuance under the Plan.
Subject to such overall limitations, shares of Stock may be issued up to such maximum number pursuant to any type or types of Award. The shares available for issuance under the Plan may be authorized but unissued shares of Stock or shares of Stock
reacquired by the Company. 
 (b)    Changes in Stock. Subject to Section 3(c) hereof, if, as a result of
any reorganization, recapitalization, reclassification, stock dividend, stock split, reverse stock split or other similar change in the Company’s capital stock, the outstanding shares of Stock are increased or decreased or are exchanged for a
different number or kind of shares or other securities of the Company, or additional shares or new or different shares or other securities of the Company or other non-cash assets are distributed with respect
to such shares of Stock or other securities, or, if, as a result of any merger or consolidation, sale of all or substantially all of the assets of the Company, the outstanding shares of Stock are converted into or exchanged for securities of the
Company or any successor entity (or a parent or subsidiary thereof), the Administrator shall make an appropriate or proportionate adjustment in (i) the maximum number of shares reserved for issuance under the Plan, including the maximum number
of shares that may be issued in the form of Incentive Stock Options, (ii) the number and kind of shares or other securities subject to any then outstanding Awards under the Plan, (iii) the repurchase price, if any, per share subject to
each outstanding Restricted Stock Award, and (iv) the exercise price for each share subject to any then outstanding Stock Options and Stock Appreciation Rights under the Plan, without changing the aggregate exercise price (i.e., the exercise
price multiplied by the number of shares subject to Stock Options and Stock Appreciation Rights) as to which such Stock Options and Stock Appreciation Rights remain exercisable. The Administrator shall also make equitable or proportionate
adjustments in the number of shares subject to outstanding Awards and the exercise price and the terms of outstanding Awards to take into consideration cash dividends paid other than in the ordinary course or any other extraordinary corporate event.
The adjustment by the Administrator shall be final, binding and conclusive. No fractional shares of Stock shall be issued under the Plan resulting from any such adjustment, but the Administrator in its discretion may make a cash payment in lieu of
fractional shares. 
 (c)    Mergers and Other Transactions. In the case of and subject to the consummation of a
Sale Event, the parties thereto may cause the assumption or continuation of Awards theretofore granted by the successor entity, or the substitution of such Awards with new Awards of the successor entity or parent thereof, with appropriate adjustment
as to the number and kind of shares and, if appropriate, the per share exercise prices, as such parties shall agree. To the extent the parties to such Sale Event do not provide for the assumption, continuation or substitution of Awards, upon the
effective time of the Sale Event, the Plan and all outstanding Awards granted hereunder shall terminate. In such case, except as may be otherwise provided in 

  
 6 

 
the relevant Award Certificate, all Options and Stock Appreciation Rights with time-based vesting conditions or restrictions that are not vested and/or exercisable immediately prior to the
effective time of the Sale Event shall become fully vested and exercisable as of the effective time of the Sale Event, all other Awards with time-based vesting, conditions or restrictions shall become fully vested and nonforfeitable as of the
effective time of the Sale Event, and all Awards with conditions and restrictions relating to the attainment of performance goals may become vested and nonforfeitable in connection with a Sale Event in the Administrator’s discretion or to the
extent specified in the relevant Award Certificate. In the event of such termination, (i) the Company shall have the option (in its sole discretion) to make or provide for a payment, in cash or in kind, to the grantees holding Options and Stock
Appreciation Rights, in exchange for the cancellation thereof, in an amount equal to the difference between (A) the Sale Price multiplied by the number of shares of Stock subject to outstanding Options and Stock Appreciation Rights (to the
extent then exercisable at prices not in excess of the Sale Price) and (B) the aggregate exercise price of all such outstanding Options and Stock Appreciation Rights (provided that, in the case of an Option or Stock Appreciation Right with an
exercise price equal to or greater than the Sale Price, such Option or Stock Appreciation Right shall be cancelled for no consideration); or (ii) each grantee shall be permitted, within a specified period of time prior to the consummation of
the Sale Event as determined by the Administrator, to exercise all outstanding Options and Stock Appreciation Rights (to the extent then exercisable) held by such grantee. The Company shall also have the option (in its sole discretion) to make or
provide for a payment, in cash or in kind, to the grantees holding other Awards in an amount equal to the Sale Price multiplied by the number of vested shares of Stock under such Awards. 

(d)    Maximum Awards to Non-Employee Directors. Notwithstanding anything
to the contrary in this Plan, the value of all Awards awarded under this Plan and all other cash compensation paid by the Company to any Non-Employee Director in any calendar year for services as a Non-Employee Director shall not exceed (i) $750,000 in the first calendar year an individual becomes a Non-Employee Director and (ii) $500,000 in any other calendar
year. For the purpose of this limitation, the value of any Award shall be its grant date fair value, as determined in accordance with ASC 718 or successor provision but excluding the impact of estimated forfeitures related to service-based vesting
provisions. 
 SECTION 4. ELIGIBILITY 

Grantees under the Plan will be such employees, Non-Employee Directors or Consultants of the Company
and its Affiliates as are selected from time to time by the Administrator in its sole discretion; provided that Awards may not be granted to employees, Directors or Consultants who are providing services only to any “parent” of the
Company, as such term is defined in Rule 405 of the Act, unless (i) the stock underlying the Awards is treated as “service recipient stock” under Section 409A or (ii) the Company has determined that such Awards are exempt
from or otherwise comply with Section 409A. 
 SECTION 5. STOCK OPTIONS 

(a)    Award of Stock Options. The Administrator may grant Stock Options under the Plan. Any Stock Option granted
under the Plan shall be in such form as the Administrator may from time to time approve. 

  
 7 

 Stock Options granted under the Plan may be either Incentive Stock Options or Non-Qualified Stock Options. Incentive Stock Options may be granted only to employees of the Company or any Subsidiary that is a “subsidiary corporation” within the meaning of Section 424(f) of the
Code. To the extent that any Option does not qualify as an Incentive Stock Option, it shall be deemed a Non-Qualified Stock Option. 

Stock Options granted pursuant to this Section 5 shall be subject to the following terms and conditions and shall contain such additional
terms and conditions, not inconsistent with the terms of the Plan, as the Administrator shall deem desirable. If the Administrator so determines, Stock Options may be granted in lieu of cash compensation at the optionee’s election, subject to
such terms and conditions as the Administrator may establish. 
 (b)    Exercise Price. The exercise price per
share for the Stock covered by a Stock Option granted pursuant to this Section 5 shall be determined by the Administrator at the time of grant but shall not be less than 100 percent of the Fair Market Value on the date of grant. In the
case of an Incentive Stock Option that is granted to a Ten Percent Owner, the exercise price of such Incentive Stock Option shall be not less than 110 percent of the Fair Market Value on the grant date. Notwithstanding the foregoing, Stock
Options may be granted with an exercise price per share that is less than 100 percent of the Fair Market Value on the date of grant (i) pursuant to a transaction described in, and in a manner consistent with, Section 424(a) of the
Code, (ii) to individuals who are not subject to U.S. income tax on the date of grant or (iii) the Stock Option is otherwise compliant with Section 409A. 

(c)    Option Term. The term of each Stock Option shall be fixed by the Administrator, but no Stock Option shall be
exercisable more than ten years after the date the Stock Option is granted. In the case of an Incentive Stock Option that is granted to a Ten Percent Owner, the term of such Stock Option shall be no more than five years from the date of grant. 

(d)    Exercisability; Rights of a Stockholder. Stock Options shall become exercisable at such time or times,
whether or not in installments, as shall be determined by the Administrator at or after the grant date. The Administrator may at any time accelerate the exercisability of all or any portion of any Stock Option. An optionee shall have the rights of a
stockholder only as to shares acquired upon the exercise of a Stock Option and not as to unexercised Stock Options. 

(e)    Method of Exercise. Stock Options may be exercised in whole or in part, by giving written or electronic
notice of exercise to the Company, specifying the number of shares to be purchased. Payment of the purchase price may be made by one or more of the following methods except to the extent otherwise provided in the Award Certificate: 

(i)    In cash, by certified or bank check or other instrument acceptable to the Administrator; 

(ii)    Through the delivery (or attestation to the ownership following such procedures as the Company may prescribe) of
shares of Stock that are not then subject to restrictions under any Company plan. Such surrendered shares shall be valued at Fair Market Value on the exercise date; 

  
 8 

 (iii)    By the optionee delivering to the Company a properly executed
exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company for the purchase price; provided that in the event the optionee chooses to pay the purchase
price as so provided, the optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Company shall prescribe as a condition of such payment procedure; or 

(iv)    With respect to Stock Options that are not Incentive Stock Options, by a “net exercise” arrangement
pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price. 

Payment instruments will be received subject to collection. The transfer to the optionee on the records of the Company or of the transfer agent of the shares
of Stock to be purchased pursuant to the exercise of a Stock Option will be contingent upon receipt from the optionee (or a purchaser acting in his stead in accordance with the provisions of the Stock Option) by the Company of the full purchase
price for such shares and the fulfillment of any other requirements contained in the Award Certificate or applicable provisions of laws (including the satisfaction of any withholding taxes that the Company is obligated to withhold with respect to
the optionee). In the event an optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock transferred to the optionee upon the exercise of the Stock Option shall be
net of the number of attested shares. In the event that the Company establishes, for itself or using the services of a third party, an automated system for the exercise of Stock Options, such as a system using an internet website or interactive
voice response, then the paperless exercise of Stock Options may be permitted through the use of such an automated system. 

(f)    Annual Limit on Incentive Stock Options. To the extent required for “incentive stock option”
treatment under Section 422 of the Code, the aggregate Fair Market Value (determined as of the time of grant) of the shares of Stock with respect to which Incentive Stock Options granted under this Plan and any other plan of the Company or its
parent and subsidiary corporations become exercisable for the first time by an optionee during any calendar year shall not exceed $100,000. To the extent that any Stock Option exceeds this limit, it shall constitute a
Non-Qualified Stock Option. 
 SECTION 6. STOCK APPRECIATION RIGHTS 

(a)    Award of Stock Appreciation Rights. The Administrator may grant Stock Appreciation Rights under the Plan. A
Stock Appreciation Right is an Award entitling the recipient to receive shares of Stock (or cash, to the extent explicitly provided for in the applicable Award Certificate) having a value equal to the excess of the Fair Market Value of a share of
Stock on the date of exercise over the exercise price of the Stock Appreciation Right multiplied by the number of shares of Stock with respect to which the Stock Appreciation Right shall have been exercised. 

  
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 (b)    Exercise Price of Stock Appreciation Rights. The exercise
price of a Stock Appreciation Right shall not be less than 100 percent of the Fair Market Value of the Stock on the date of grant. 

(c)    Grant and Exercise of Stock Appreciation Rights. Stock Appreciation Rights may be granted by the
Administrator independently of any Stock Option granted pursuant to Section 5 of the Plan. 
 (d)    Terms and
Conditions of Stock Appreciation Rights. Stock Appreciation Rights shall be subject to such terms and conditions as shall be determined on the date of grant by the Administrator. The term of a Stock Appreciation Right may not exceed ten years.
The terms and conditions of each such Award shall be determined by the Administrator, and such terms and conditions may differ among individual Awards and grantees. 

SECTION 7. RESTRICTED STOCK AWARDS 

(a)    Nature of Restricted Stock Awards. The Administrator may grant Restricted Stock Awards under the Plan. A
Restricted Stock Award is any Award of Restricted Shares subject to such restrictions and conditions as the Administrator may determine at the time of grant. Conditions may be based on continuing employment (or other Service Relationship) and/or
achievement of pre-established performance goals and objectives. 

(b)    Rights as a Stockholder. Upon the grant of the Restricted Stock Award and payment of any applicable purchase
price, a grantee shall have the rights of a stockholder with respect to the voting of the Restricted Shares and receipt of dividends; provided that if the lapse of restrictions with respect to the Restricted Stock Award is tied to the attainment of
performance goals, any dividends paid by the Company during the performance period shall accrue and shall not be paid to the grantee until and to the extent the performance goals are met with respect to the Restricted Stock Award. Unless the
Administrator shall otherwise determine, (i) uncertificated Restricted Shares shall be accompanied by a notation on the records of the Company or the transfer agent to the effect that they are subject to forfeiture until such Restricted Shares
are vested as provided in Section 7(d) below, and (ii) certificated Restricted Shares shall remain in the possession of the Company until such Restricted Shares are vested as provided in Section 7(d) below, and the grantee shall be
required, as a condition of the grant, to deliver to the Company such instruments of transfer as the Administrator may prescribe. 

(c)    Restrictions. Restricted Shares may not be sold, assigned, transferred, pledged or otherwise encumbered or
disposed of except as specifically provided herein or in the Restricted Stock Award Certificate. Except as may otherwise be provided by the Administrator either in the Award Certificate or, subject to Section 16 below, in writing after the
Award is issued, if a grantee’s employment (or other Service Relationship) with the Company and its Subsidiaries terminates for any reason, any Restricted Shares that have not vested at the time of termination shall automatically and without
any requirement of notice to such grantee from or other action by or on behalf of, the Company be deemed to have been reacquired by the Company at their original purchase price (if any) from such grantee or such grantee’s legal representative
simultaneously with such termination of employment (or other Service Relationship), and thereafter shall cease to represent any ownership of the Company by the grantee or rights of the 

  
 10 

 
grantee as a stockholder. Following such deemed reacquisition of Restricted Shares that are represented by physical certificates, a grantee shall surrender such certificates to the Company upon
request without consideration. 
 (d)    Vesting of Restricted Shares. The Administrator at the time of grant
shall specify the date or dates and/or the attainment of pre-established performance goals, objectives and other conditions on which the non-transferability of the
Restricted Shares and the Company’s right of repurchase or forfeiture shall lapse. Subsequent to such date or dates and/or the attainment of such pre-established performance goals, objectives and other
conditions, the shares on which all restrictions have lapsed shall no longer be Restricted Shares and shall be deemed “vested.” 
 SECTION 8.
RESTRICTED STOCK UNITS 
 (a)    Nature of Restricted Stock Units. The Administrator may grant Restricted
Stock Units under the Plan. A Restricted Stock Unit is an Award of stock units that may be settled in shares of Stock (or cash, to the extent explicitly provided for in the Award Certificate) upon the satisfaction of such restrictions and conditions
at the time of grant. Conditions may be based on continuing employment (or other Service Relationship) and/or achievement of pre-established performance goals and objectives. The terms and conditions of each
such Award shall be determined by the Administrator, and such terms and conditions may differ among individual Awards and grantees. Except in the case of Restricted Stock Units with a deferred settlement date that complies with Section 409A, at
the end of the vesting period, the Restricted Stock Units, to the extent vested, shall be settled in the form of shares of Stock. Restricted Stock Units with deferred settlement dates are subject to Section 409A and shall contain such
additional terms and conditions as the Administrator shall determine in its sole discretion in order to comply with the requirements of Section 409A. 

(b)    Election to Receive Restricted Stock Units in Lieu of Compensation. The Administrator may, in its sole
discretion, permit a grantee to elect to receive a portion of future cash compensation otherwise due to such grantee in the form of an award of Restricted Stock Units. Any such election shall be made in writing and shall be delivered to the Company
no later than the date specified by the Administrator and in accordance with Section 409A and such other rules and procedures established by the Administrator. Any such future cash compensation that the grantee elects to defer shall be
converted to a fixed number of Restricted Stock Units based on the Fair Market Value of Stock on the date the compensation would otherwise have been paid to the grantee if such payment had not been deferred as provided herein. The Administrator
shall have the sole right to determine whether and under what circumstances to permit such elections and to impose such limitations and other terms and conditions thereon as the Administrator deems appropriate. Any Restricted Stock Units that are
elected to be received in lieu of cash compensation shall be fully vested, unless otherwise provided in the Award Certificate. 

(c)    Rights as a Stockholder. A grantee shall have the rights as a stockholder only as to shares of Stock
acquired by the grantee upon settlement of Restricted Stock Units; provided, however, that the grantee may be credited with Dividend Equivalent Rights with respect to the stock units underlying his Restricted Stock Units, subject to the provisions
of Section 11 and such terms and conditions as the Administrator may determine. 

  
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 (d)    Termination. Except as may otherwise be provided by the
Administrator either in the Award Certificate or, subject to Section 16 below, in writing after the Award is issued, a grantee’s right in all Restricted Stock Units that have not vested shall automatically terminate upon the grantee’s
termination of employment (or cessation of Service Relationship) with the Company and its Subsidiaries for any reason. 
 SECTION 9. UNRESTRICTED STOCK
AWARDS 
 Grant or Sale of Unrestricted Stock. The Administrator may grant (or sell at par value or such higher purchase price
determined by the Administrator) an Unrestricted Stock Award under the Plan. An Unrestricted Stock Award is an Award pursuant to which the grantee may receive shares of Stock free of any restrictions under the Plan. Unrestricted Stock Awards may be
granted in respect of past services or other valid consideration, or in lieu of cash compensation due to such grantee. 
 SECTION 10. CASH-BASED
AWARDS 
 Grant of Cash-Based Awards. The Administrator may grant Cash-Based Awards under the Plan. A Cash-Based Award is an Award
that entitles the grantee to a payment in cash upon the attainment of specified performance goals. The Administrator shall determine the maximum duration of the Cash-Based Award, the amount of cash to which the Cash-Based Award pertains, the
conditions upon which the Cash-Based Award shall become vested or payable, and such other provisions as the Administrator shall determine. Each Cash-Based Award shall specify a cash-denominated payment amount, formula or payment ranges as determined
by the Administrator. Payment, if any, with respect to a Cash-Based Award shall be made in accordance with the terms of the Award and may be made in cash. 

SECTION 11. DIVIDEND EQUIVALENT RIGHTS 

(a)    Dividend Equivalent Rights. The Administrator may grant Dividend Equivalent Rights under the Plan. A Dividend
Equivalent Right is an Award entitling the grantee to receive credits based on cash dividends that would have been paid on the shares of Stock specified in the Dividend Equivalent Right (or other Award to which it relates) if such shares had been
issued to the grantee. A Dividend Equivalent Right may be granted hereunder to any grantee as a component of an award of Restricted Stock Units or as a freestanding award. The terms and conditions of Dividend Equivalent Rights shall be specified in
the Award Certificate. Dividend equivalents credited to the holder of a Dividend Equivalent Right may be paid currently or may be deemed to be reinvested in additional shares of Stock, which may thereafter accrue additional equivalents. Any such
reinvestment shall be at Fair Market Value on the date of reinvestment or such other price as may then apply under a dividend reinvestment plan sponsored by the Company, if any. Dividend Equivalent Rights may be settled in cash or shares of Stock or
a combination thereof, in a single installment or installments. A Dividend Equivalent Right granted as a component of an Award of Restricted Stock Units shall provide that such Dividend Equivalent Right shall be settled only upon settlement or
payment of, or lapse of restrictions on, such other Award, and that such Dividend Equivalent Right shall expire or be forfeited or annulled under the same conditions as such other Award. 

  
 12 

 (b)    Termination. Except as may otherwise be provided by the
Administrator either in the Award Certificate or, subject to Section 16 below, in writing after the Award is issued, a grantee’s rights in all Dividend Equivalent Rights shall automatically terminate upon the grantee’s termination of
employment (or cessation of Service Relationship) with the Company and its Subsidiaries for any reason. 
 SECTION 12. TRANSFERABILITY OF AWARDS 

(a)    Transferability. Except as provided in Section 12(b) below, during a grantee’s lifetime, his or her
Awards shall be exercisable only by the grantee, or by the grantee’s legal representative or guardian in the event of the grantee’s incapacity. No Awards shall be sold, assigned, transferred or otherwise encumbered or disposed of by a
grantee other than by will or by the laws of descent and distribution or pursuant to a domestic relations order. No Awards shall be subject, in whole or in part, to attachment, execution, or levy of any kind, and any purported transfer in violation
hereof shall be null and void. 
 (b)    Administrator Action. Notwithstanding Section 12(a), the
Administrator, in its discretion, may provide either in the Award Certificate regarding a given Award or by subsequent written approval that the grantee (who is an employee or director) may transfer his or her
Non-Qualified Stock Options to his or her immediate family members, to trusts for the benefit of such family members, or to partnerships in which such family members are the only partners, provided that the
transferee agrees in writing with the Company to be bound by all of the terms and conditions of this Plan and the applicable Award. In no event may an Award be transferred by a grantee for value. 

(c)    Family Member. For purposes of Section 12(b), “family member” shall mean a grantee’s
child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law, including adoptive relationships, any person sharing the
grantee’s household (other than a tenant of the grantee), a trust in which these persons (or the grantee) have more than 50 percent of the beneficial interest, a foundation in which these persons (or the grantee) control the management of
assets, and any other entity in which these persons (or the grantee) own more than 50 percent of the voting interests. 

(d)    Designation of Beneficiary. To the extent permitted by the Company, each grantee to whom an Award has been
made under the Plan may designate a beneficiary or beneficiaries to exercise any Award or receive any payment under any Award payable on or after the grantee’s death. Any such designation shall be on a form provided for that purpose by the
Administrator and shall not be effective until received by the Administrator. If no beneficiary has been designated by a deceased grantee, or if the designated beneficiaries have predeceased the grantee, the beneficiary shall be the grantee’s
estate. 
 SECTION 13. TAX WITHHOLDING 

(a)    Payment by Grantee. Each grantee shall, no later than the date as of which the value of an Award or of any
Stock or other amounts received thereunder first becomes includable in the gross income of the grantee for Federal income tax purposes, pay to the 

  
 13 

 
Company, or make arrangements satisfactory to the Administrator regarding payment of, any Federal, state, or local taxes of any kind required by law to be withheld by the Company with respect to
such income. The Company and its Subsidiaries shall, to the extent permitted by law, have the right to deduct any such taxes from any payment of any kind otherwise due to the grantee. The Company’s obligation to deliver evidence of book entry
(or stock certificates) to any grantee is subject to and conditioned on tax withholding obligations being satisfied by the grantee. 

(b)    Payment in Stock. The Administrator may require the Company’s tax withholding obligation to be
satisfied, in whole or in part, by the Company withholding from shares of Stock to be issued pursuant to any Award a number of shares with an aggregate Fair Market Value (as of the date the withholding is effected) that would satisfy the withholding
amount due; provided, however, that the amount withheld does not exceed the maximum statutory tax rate or such lesser amount as is necessary to avoid liability accounting treatment. For purposes of share withholding, the Fair Market Value of
withheld shares shall be determined in the same manner as the value of Stock includible in income of the grantees. The Administrator may also require the Company’s tax withholding obligation to be satisfied, in whole or in part, by an
arrangement whereby a certain number of shares of Stock issued pursuant to any Award are immediately sold and proceeds from such sale are remitted to the Company in an amount that would satisfy the withholding amount due. 

SECTION 14. SECTION 409A AWARDS 

Awards are intended to be exempt from Section 409A to the greatest extent possible and to otherwise comply with Section 409A. The
Plan and all Awards shall be interpreted in accordance with such intent. To the extent that any Award is determined to constitute “nonqualified deferred compensation” within the meaning of Section 409A (a “409A Award”), the
Award shall be subject to such additional rules and requirements as specified by the Administrator from time to time in order to comply with Section 409A. In this regard, if any amount under a 409A Award is payable upon a “separation from
service” (within the meaning of Section 409A) to a grantee who is then considered a “specified employee” (within the meaning of Section 409A), then no such payment shall be made prior to the date that is the earlier of
(i) six months and one day after the grantee’s separation from service, or (ii) the grantee’s death, but only to the extent such delay is necessary to prevent such payment from being subject to interest, penalties and/or
additional tax imposed pursuant to Section 409A. Further, the settlement of any 409A Award may not be accelerated except to the extent permitted by Section 409A. 

SECTION 15. TERMINATION OF SERVICE RELATIONSHIP, TRANSFER, LEAVE OF ABSENCE, ETC. 

(a)    Termination of Service Relationship. If the grantee’s Service Relationship is with an Affiliate and such
Affiliate ceases to be an Affiliate, the grantee shall be deemed to have terminated his or her Service Relationship for purposes of the Plan. 

(b)    For purposes of the Plan, the following events shall not be deemed a termination of a Service Relationship: 

(i)    a transfer to the employment of the Company from an Affiliate or from the Company to an Affiliate, or from one
Affiliate to another; or 

  
 14 

 (ii)    an approved leave of absence for military service or sickness,
or for any other purpose approved by the Company, if the employee’s right to re-employment is guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was
granted or if the Administrator otherwise so provides in writing. 
 SECTION 16. AMENDMENTS AND TERMINATION 

The Board may, at any time, amend or discontinue the Plan and the Administrator may, at any time, amend or cancel any outstanding Award for the
purpose of satisfying changes in law or for any other lawful purpose, but no such action shall materially and adversely affect rights under any outstanding Award without the holder’s consent. The Administrator is specifically authorized to
exercise its discretion to reduce the exercise price of outstanding Stock Options or Stock Appreciation Rights or effect the repricing of such Awards through cancellation and re-grants. To the extent required
under the rules of any securities exchange or market system on which the Stock is listed, to the extent determined by the Administrator to be required by the Code to ensure that Incentive Stock Options granted under the Plan are qualified under
Section 422 of the Code, Plan amendments shall be subject to approval by Company stockholders. Nothing in this Section 16 shall limit the Administrator’s authority to take any action permitted pursuant to Section 3(b) or 3(c).

 SECTION 17. STATUS OF PLAN 
 With
respect to the portion of any Award that has not been exercised and any payments in cash, Stock or other consideration not received by a grantee, a grantee shall have no rights greater than those of a general creditor of the Company unless the
Administrator shall otherwise expressly determine in connection with any Award or Awards. In its sole discretion, the Administrator may authorize the creation of trusts or other arrangements to meet the Company’s obligations to deliver Stock or
make payments with respect to Awards hereunder, provided that the existence of such trusts or other arrangements is consistent with the foregoing sentence. 

SECTION 18. GENERAL PROVISIONS 

(a)    No Distribution. The Administrator may require each person acquiring Stock pursuant to an Award to represent
to and agree with the Company in writing that such person is acquiring the shares without a view to distribution thereof. 

(b)    Issuance of Stock. To the extent certificated, stock certificates to grantees under this Plan shall be
deemed delivered for all purposes when the Company or a stock transfer agent of the Company shall have mailed such certificates in the United States mail, addressed to the grantee, at the grantee’s last known address on file with the Company.
Uncertificated Stock shall be deemed delivered for all purposes when the Company or a Stock transfer agent of the Company shall have given to the grantee by electronic mail (with proof of receipt) or by United States mail, addressed to the grantee,
at the grantee’s last known address on file with the Company, notice of issuance and recorded the issuance in its records (which may include electronic “book entry” records). Notwithstanding anything herein to the contrary, the
Company 

  
 15 

 
shall not be required to issue or deliver any evidence of book entry or certificates evidencing shares of Stock pursuant to the exercise or settlement of any Award, unless and until the
Administrator has determined, with advice of counsel (to the extent the Administrator deems such advice necessary or advisable), that the issuance and delivery is in compliance with all applicable laws, regulations of governmental authorities and,
if applicable, the requirements of any exchange on which the shares of Stock are listed, quoted or traded. Any Stock issued pursuant to the Plan shall be subject to any stop-transfer orders and other restrictions as the Administrator deems necessary
or advisable to comply with federal, state or foreign jurisdiction, securities or other laws, rules and quotation system on which the Stock is listed, quoted or traded. The Administrator may place legends on any Stock certificate or notations on any
book entry to reference restrictions applicable to the Stock. In addition to the terms and conditions provided herein, the Administrator may require that an individual make such reasonable covenants, agreements, and representations as the
Administrator, in its discretion, deems necessary or advisable in order to comply with any such laws, regulations, or requirements. The Administrator shall have the right to require any individual to comply with any timing or other restrictions with
respect to the settlement or exercise of any Award, including a window-period limitation, as may be imposed in the discretion of the Administrator. 

(c)    Stockholder Rights. Until Stock is deemed delivered in accordance with Section 18(b), no right to vote
or receive dividends or any other rights of a stockholder will exist with respect to shares of Stock to be issued in connection with an Award, notwithstanding the exercise of a Stock Option or any other action by the grantee with respect to an
Award. 
 (d)    Other Compensation Arrangements; No Employment Rights. Nothing contained in this Plan shall
prevent the Board from adopting other or additional compensation arrangements, including trusts, and such arrangements may be either generally applicable or applicable only in specific cases. The adoption of this Plan and the grant of Awards do not
confer upon any employee any right to continued employment with the Company or any Subsidiary. 
 (e)    Trading
Policy Restrictions. Option exercises and other Awards under the Plan shall be subject to the Company’s insider trading policies and procedures, as in effect from time to time. 

(f)    Clawback Policy. Awards under the Plan shall be subject to the Company’s clawback policy, as in effect
from time to time. 
 SECTION 19. EFFECTIVE DATE OF PLAN 

This Plan shall become effective upon the date immediately preceding the Registration Date subject to prior stockholder approval in accordance
with applicable state law, the Company’s bylaws and articles of incorporation, and applicable stock exchange rules. No grants of Stock Options and other Awards may be made hereunder after the tenth anniversary of the Effective Date and no
grants of Incentive Stock Options may be made hereunder after the tenth anniversary of the date the Plan is approved by the Board. 

  
 16 

 SECTION 20. GOVERNING LAW 

This Plan and all Awards and actions taken thereunder shall be governed by, and construed in accordance with, the General Corporation Law of
the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts, applied without regard to conflict of law
principles. 
 DATE APPROVED BY BOARD OF DIRECTORS: December 31, 2020 

DATE APPROVED BY STOCKHOLDERS: January 3, 2021 

  
 17 

 INCENTIVE STOCK OPTION AGREEMENT 

UNDER THE CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 
  

			
	Name of Optionee:	  	                                     
                                         
      
		
	No. of Option Shares:	  	                                     
   
		
	Option Exercise Price per Share:	  	$                                     
 
		  	[FMV on Grant Date (110% of FMV if a 10% owner)]
		
	Grant Date:	  	                                     
   
		
	Expiration Date:	  	                                     
   
		  	[up to 10 years (5 if a 10% owner)]

 Pursuant to the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan as amended through the date
hereof (the “Plan”), Cullinan Management, Inc. (the “Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the
number of shares of Common Stock, par value $0.0001 per share (the “Stock”), of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. 

1.    Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have
become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to
the following number of Option Shares on the dates indicated so long as the Optionee remains in a Service Relationship with the Company or a Subsidiary on such dates: 
  

					
	 Incremental Number of
Option Shares Exercisable*
	  	Exercisability Date	 
	
                   
  (    %)
	  	 	                        	 
	
                   
  (    %)
	  	 	                        	 
	
                   
  (    %)
	  	 	                        	 
	
                   
  (    %)
	  	 	                        	 
	
                   
  (    %)
	  	 	                        	 

  

	*	 Max. of $100,000 per yr. 

Once exercisable, this Stock Option shall continue to be exercisable at any time or times prior to the close of business on the Expiration
Date, subject to the provisions hereof and of the Plan. 

 2.    Manner of Exercise. 

(a)    The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the
Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of
Option Shares to be purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods:
(i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that
are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; or (iii) by the Optionee delivering to the
Company a properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the
Optionee chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of
such payment procedure; or (iv) a combination of (i), (ii) and (iii) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 
 (b)    The
shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable
laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be
the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent
shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights
with respect to such shares of Stock. 

  
 2 

 (c)    The minimum number of shares with respect to which this Stock
Option may be exercised at any one time shall be 100 shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d)    Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable
after the Expiration Date hereof. 
 3.    Termination of Service Relationship. If the Optionee’s Service
Relationship with the Company or a Subsidiary (as defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below. 

(a)    Termination Due to Death. If the Optionee’s Service Relationship terminates by reason of the
Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or legatee for a period of 12 months from the
date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect. 

(b)    Termination Due to Disability. If the Optionee’s Service Relationship terminates by reason of the
Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination of Service Relationship, may thereafter be exercised by the
Optionee for a period of 12 months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or
effect. 
 (c)    Termination for Cause. If the Optionee’s Service Relationship terminates for Cause, any
portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. For purposes hereof, “Cause” shall mean, unless otherwise provided in an employment agreement between the Company and
the Optionee, a determination by the Administrator that the Optionee shall be dismissed as a result of (i) any material breach by the Optionee of any agreement between the Optionee and the Company; (ii) the conviction of, indictment
for or plea of nolo contendere by the Optionee to a felony or a crime involving moral turpitude; or (iii) any material misconduct or willful and deliberate non-performance (other than by reason of
disability) by the Optionee of the Optionee’s duties to the Company. 
 (d)    Other Termination. If the
Optionee’s Service Relationship terminates for any reason other than the Optionee’s death, the Optionee’s disability, or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such
date may be exercised, to the extent exercisable on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of
termination shall terminate immediately and be of no further force or effect. 

  
 3 

 The Administrator’s determination of the reason for termination of the Optionee’s
Service Relationship shall be conclusive and binding on the Optionee and his or her representatives or legatees. 

4.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 5.    Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s
lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee. 

6.    Status of the Stock Option. This Stock Option is intended to qualify as an “incentive stock option”
under Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), but the Company does not represent or warrant that this Stock Option qualifies as such. The Optionee should consult with his or her own tax advisors
regarding the tax effects of this Stock Option and the requirements necessary to obtain favorable income tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements. To the extent any portion of this
Stock Option does not so qualify as an “incentive stock option,” such portion shall be deemed to be a non-qualified stock option. If the Optionee intends to dispose or does dispose (whether by sale,
gift, transfer or otherwise) of any Option Shares within the one-year period beginning on the date after the transfer of such shares to him or her, or within the
two-year period beginning on the day after the grant of this Stock Option, he or she will so notify the Company within 30 days after such disposition. 

7.    Tax Withholding. The Optionee shall, not later than the date as of which the exercise of this Stock Option
becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event.
The Company shall have the authority to cause the required tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Stock to be issued to the Optionee a number of shares of Stock with an aggregate Fair Market
Value that would satisfy the withholding amount due. 
 8.    No Obligation to Continue Employment. Neither the
Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Optionee in employment and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to
terminate the employment of the Optionee at any time. 
 9.    Integration. This Agreement constitutes the entire
agreement between the parties with respect to this Stock Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

  
 4 

 10.    Data Privacy Consent. In order to administer the Plan and
this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data,
including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the
“Relevant Information”). By entering into this Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the
Optionee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction
in which the Relevant Companies consider appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

11.    Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business
and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

 

			
	CULLINAN MANAGEMENT, INC.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 
  

							
	Dated:                     	 		 	    	 	  

		 		 		 	Optionee’s Signature
				
		 		 		 	Optionee’s name and address:
		 		 		 	  

		 		 		 	  

		 		 		 	  

  
 5 

 RESTRICTED STOCK AWARD AGREEMENT 

UNDER THE CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 
  

			
	Name of Grantee:	 	                                      
                      
		
	No. of Shares:	 	                                      
  
		
	Grant Date:	 	                                      
  

 Pursuant to the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan (the “Plan”) as
amended through the date hereof, Cullinan Management, Inc. (the “Company”) hereby grants a Restricted Stock Award (an “Award”) to the Grantee named above. Upon acceptance of this Award, the Grantee shall receive the number of
shares of Common Stock, par value $0.0001 per share (the “Stock”) of the Company specified above, subject to the restrictions and conditions set forth herein and in the Plan. The Company acknowledges the receipt from the Grantee of
consideration with respect to the par value of the Stock in the form of cash, past or future services rendered to the Company by the Grantee or such other form of consideration as is acceptable to the Administrator. 

1.    Award. The shares of Restricted Stock awarded hereunder shall be issued and held by the Company’s
transfer agent in book entry form, and the Grantee’s name shall be entered as the stockholder of record on the books of the Company. Thereupon, the Grantee shall have all the rights of a stockholder with respect to such shares, including voting
and dividend rights, subject, however, to the restrictions and conditions specified in Paragraph 2 below. The Grantee shall (i) sign and deliver to the Company a copy of this Award Agreement and (ii) deliver to the Company a stock
power endorsed in blank. 
 2.    Restrictions and Conditions. 

(a)    Any book entries for the shares of Restricted Stock granted herein shall bear an appropriate legend, as determined
by the Administrator in its sole discretion, to the effect that such shares are subject to restrictions as set forth herein and in the Plan. 

(b)    Shares of Restricted Stock granted herein may not be sold, assigned, transferred, pledged or otherwise encumbered
or disposed of by the Grantee prior to vesting. 
 (c)    If the Grantee’s employment with the Company and its
Subsidiaries is voluntarily or involuntarily terminated for any reason (including death) prior to vesting of shares of Restricted Stock granted herein, all shares of Restricted Stock shall immediately and automatically be forfeited and returned to
the Company. 
 3.    Vesting of Restricted Stock. The restrictions and conditions in Paragraph 2 of this
Agreement shall lapse on the Vesting Date or Dates specified in the following schedule so long as the Grantee remains in a Service Relationship with the Company or a Subsidiary on such Dates. If a series of Vesting Dates is specified, then the
restrictions and conditions in Paragraph 2 shall lapse only with respect to the number of shares of Restricted Stock specified as vested on such date. 

					
	 Incremental Number
of Shares Vested
	  	Vesting Date	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 

 Subsequent to such Vesting Date or Dates, the shares of Stock on which all restrictions and conditions have
lapsed shall no longer be deemed Restricted Stock. The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 3. 

4.    Dividends. Dividends on shares of Restricted Stock shall be paid currently to the Grantee. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Award shall be subject to and
governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning
is specified herein. 
 6.    Transferability. This Agreement is personal to the Grantee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. 

7.    Tax Withholding. The Grantee shall, not later than the date as of which the receipt of this Award becomes a
taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. Except in
the case where an election is made pursuant to Paragraph 8 below, the Company shall have the authority to cause the required tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Stock to be issued or
released by the transfer agent a number of shares of Stock with an aggregate Fair Market Value that would satisfy the withholding amount due. 

8.    Election Under Section 83(b). The Grantee and the Company hereby agree that the Grantee
may, within 30 days following the Grant Date of this Award, file with the Internal Revenue Service and the Company an election under Section 83(b) of the Internal Revenue Code. In the event the Grantee makes such an election, he or she agrees
to provide a copy of the election to the Company. The Grantee acknowledges that he or she is responsible for obtaining the advice of his or her tax advisors with regard to the Section 83(b) election and that he or she is relying solely on such
advisors and not on any statements or representations of the Company or any of its agents with regard to such election. 

  
 2 

 9.    No Obligation to Continue Service Relationship. Neither the
Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Grantee in his or her Service Relationship and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or
any Subsidiary to terminate the Service Relationship of the Grantee at any time. 
 10.    Integration. This
Agreement constitutes the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

11.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure
future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information;
(iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The
Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

  
 3 

 12.    Notices. Notices hereunder shall be mailed or delivered to
the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

  

			
	CULLINAN MANAGEMENT, INC.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 
  

							
	Dated:                     	 		 	    	 	  

		 		 		 	Grantee’s Signature
				
		 		 		 	Grantee’s name and address:
		 		 		 	  

		 		 		 	  

		 		 		 	  

  
 4 

 RESTRICTED STOCK UNIT AWARD AGREEMENT 

FOR COMPANY EMPLOYEES 

UNDER THE CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 
  

			
	Name of Grantee:	  	                                      
                      
		
	No. of Restricted Stock Units:	  	                                      
  
		
	Grant Date:	  	                                      
  

 Pursuant to the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan as amended through the date
hereof (the “Plan”), Cullinan Management, Inc. (the “Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate
to one share of Common Stock, par value $0.0001 per share (the “Stock”) of the Company. 

1.    Restrictions on Transfer of Award. This Award may not be sold, transferred, pledged, assigned or otherwise
encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until (i) the Restricted Stock Units have vested as
provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement. 

2.    Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement
shall lapse on the Vesting Date or Dates specified in the following schedule so long as the Grantee remains in a Service Relationship with the Company or a Subsidiary on such Dates. If a series of Vesting Dates is specified, then the restrictions
and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. 
  

					
	 Incremental Number of
Restricted Stock Units Vested
	  	Vesting Date	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 

 The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2. 

3.    Termination of Service Relationship. If the Grantee’s Service Relationship with the Company and its
Subsidiaries terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and
without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units. 

 4.    Issuance of Shares of Stock. As soon as practicable
following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock
equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 6.    Tax Withholding. The Grantee shall, not later than the date as of which the
receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of
such taxable event. The Company shall have the authority to cause the required tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Stock to be issued to the Grantee a number of shares of Stock with an
aggregate Fair Market Value that would satisfy the withholding amount due. 
 7.    Section 409A of the Code.
This Agreement shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A
of the Code. 
 8.    No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is
obligated by or as a result of the Plan or this Agreement to continue the Grantee in a Service Relationship and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Service
Relationship of the Grantee at any time. 
 9.    Integration. This Agreement constitutes the entire agreement
between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

10.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure
future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy 

  
 2 

 
rights the Grantee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and
(iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will
only be used in accordance with applicable law. 
 11.    Notices. Notices hereunder shall be mailed or delivered
to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

  

			
	CULLINAN MANAGEMENT, INC.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 
  

							
	Dated:                     	 		 	    	 	  

		 		 		 	Grantee’s Signature
				
		 		 		 	Grantee’s name and address:
		 		 		 	  

		 		 		 	  

		 		 		 	  

  
 3 

 RESTRICTED STOCK UNIT AWARD AGREEMENT 

FOR NON-EMPLOYEE DIRECTORS 

UNDER THE CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 
  

			
	Name of Grantee:	  	                                      
                      
		
	No. of Restricted Stock Units:	  	                                      
  
		
	Grant Date:	  	                                      
  

 Pursuant to the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan as amended through the date
hereof (the “Plan”), Cullinan Management, Inc. (the “Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate
to one share of Common Stock, par value $0.0001 per share (the “Stock”) of the Company. 

1.    Restrictions on Transfer of Award. This Award may not be sold, transferred, pledged, assigned or otherwise
encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until (i) the Restricted Stock Units have vested as
provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement. 

2.    Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement
shall lapse on the Vesting Date or Dates specified in the following schedule so long as the Grantee remains in service as a member of the Board on such Dates. If a series of Vesting Dates is specified, then the restrictions and conditions in
Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. 
  

					
	 Incremental Number of
Restricted Stock Units Vested
	  	Vesting Date	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 
	
                
(    %)
	  	 	                    	 

 The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2. 

3.    Termination of Service as a Non-Employee Director. If the
Grantee’s service with the Company and its Subsidiaries as a member of the Board terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock
Units that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further
rights or interests in such unvested Restricted Stock Units. 
  

 4.    Issuance of Shares of Stock. As soon as practicable
following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock
equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 6.    Section 409A of the Code. This Agreement shall be interpreted in such a
manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the Code. 

7.    No Obligation to Continue as a Non-Employee Director. Neither the
Plan nor this Award confers upon the Grantee any rights with respect to continuance as a Non-Employee Director. 

8.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award
and supersedes all prior agreements and discussions between the parties concerning such subject matter. 
 9.    Data
Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may
process any and all personal or professional data, including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the
administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant
Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the
transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance
with applicable law. 

  
 2 

 10.    Notices. Notices hereunder shall be mailed or delivered to
the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

  

			
	CULLINAN MANAGEMENT, INC.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 
  

							
	Dated:                     	 		 	    	 	  

		 		 		 	Grantee’s Signature
				
		 		 		 	Grantee’s name and address:
		 		 		 	  

		 		 		 	  

		 		 		 	  

  
 3 

 NON-QUALIFIED STOCK OPTION AGREEMENT 

FOR COMPANY EMPLOYEES 

UNDER THE CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 
  

			
		
	Name of Optionee:	  	                                      
                              
		
	No. of Option Shares:	  	                                      
  
		
	Option Exercise Price per Share:	  	$                                      

		  	[FMV on Grant Date]
		
	Grant Date:	  	                                      
  
		
	Expiration Date:	  	                                      
  

 Pursuant to the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan as amended through the date
hereof (the “Plan”), Cullinan Management, Inc. (the “Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the
number of shares of Common Stock, par value $0.0001 per share (the “Stock”) of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. This
Stock Option is not intended to be an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended. 

1.    Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have
become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to
the following number of Option Shares on the dates indicated so long as Optionee remains in a Service Relationship with the Company or a Subsidiary on such dates: 
  

					
	 Incremental Number of
Option Shares Exercisable
	  	Exercisability Date	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 

  
 Once exercisable, this Stock Option
shall continue to be exercisable at any time or times prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan. 

 2.    Manner of Exercise. 

(a)    The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the
Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of
Option Shares to be purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods:
(i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that
are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a
properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee
chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such
payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed
the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 
 (b)    The
shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable
laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be
the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent
shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights
with respect to such shares of Stock. 

  
 2 

 (c)    The minimum number of shares with respect to which this Stock
Option may be exercised at any one time shall be 100 shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d)    Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable
after the Expiration Date hereof. 
 3.    Termination of Service Relationship. If the Optionee’s Service
Relationship with the Company or a Subsidiary (as defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below. 

(a)    Termination Due to Death. If the Optionee’s Service Relationship terminates by reason of the
Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or legatee for a period of 12 months from the
date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect. 

(b)    Termination Due to Disability. If the Optionee’s Service Relationship terminates by reason of the
Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination of his or her Service Relationship, may thereafter be exercised by
the Optionee for a period of 12 months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or
effect. 
 (c)    Termination for Cause. If the Optionee’s Service Relationship terminates for Cause, any
portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. For purposes hereof, “Cause” shall mean, unless otherwise provided in an employment agreement between the Company and
the Optionee, a determination by the Administrator that the Optionee shall be dismissed as a result of (i) any material breach by the Optionee of any agreement between the Optionee and the Company; (ii) the conviction of, indictment for or
plea of nolo contendere by the Optionee to a felony or a crime involving moral turpitude; or (iii) any material misconduct or willful and deliberate non-performance (other than by reason of disability) by
the Optionee of the Optionee’s duties to the Company. 
 (d)    Other Termination. If the Optionee’s
Service Relationship terminates for any reason other than the Optionee’s death, the Optionee’s disability or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such date may be
exercised, to the extent exercisable on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of termination
shall terminate immediately and be of no further force or effect. 

  
 3 

 The Administrator’s determination of the reason for termination of the Optionee’s
Service Relationship shall be conclusive and binding on the Optionee and his or her representatives or legatees. 

4.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 5.    Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s
lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee. 

6.    Tax Withholding. The Optionee shall, not later than the date as of which the exercise of this Stock Option
becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event.
The Company shall have the authority to cause the required tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Stock to be issued to the Optionee a number of shares of Stock with an aggregate Fair Market
Value that would satisfy the withholding amount due. 
 7.    No Obligation to Continue Service Relationship.
Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Optionee in his or her Service Relationship and neither the Plan nor this Agreement shall interfere in any way with the right of the
Company or any Subsidiary to terminate the Service Relationship of the Optionee at any time. 

8.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock
Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

9.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future
equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant
Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider
appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

  
 4 

 10.    Notices. Notices hereunder shall be mailed or delivered to
the Company at its principal place of business and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

  

			
	CULLINAN MANAGEMENT, INC.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 
  

					
	Dated:                    	  	    	  	  

		  		  	Optionee’s Signature
			
		  		  	Optionee’s name and address:
		  		  	  

		  		  	  

		  		  	  

  
 5 

 NON-QUALIFIED STOCK OPTION AGREEMENT 

FOR NON-EMPLOYEE DIRECTORS 

UNDER THE CULLINAN MANAGEMENT, INC. 

2021 STOCK OPTION AND INCENTIVE PLAN 
  

			
	Name of Optionee:	  	                                     
                                         
      
		
	No. of Option Shares:	  	                                     
   
		
	Option Exercise Price per Share:	  	$                                     
 
		  	[FMV on Grant Date]
		
	Grant Date:	  	                                     
   
		
	Expiration Date:	  	                                     
   
		  	[No more than 10 years]

 Pursuant to the Cullinan Management, Inc. 2021 Stock Option and Incentive Plan as amended through the date
hereof (the “Plan”), Cullinan Management, Inc. (the “Company”) hereby grants to the Optionee named above, who is a Non-Employee Director of the Company but is not an employee of the
Company, an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of Common Stock, par value $0.0001 per share (the “Stock”), of the Company specified above
at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. This Stock Option is not intended to be an “incentive stock option” under Section 422 of the Internal Revenue
Code of 1986, as amended. 
 1.    Exercisability Schedule. No portion of this Stock Option may be exercised
until such portion shall have become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall
be exercisable with respect to the following number of Option Shares on the dates indicated so long as the Optionee remains in service as a member of the Board on such dates: 
  

					
	 Incremental Number of
Option Shares Exercisable
	  	Exercisability Date	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 
	
                ( 
   %)
	  	 	                    	 

 Once exercisable, this Stock Option shall continue to be exercisable at any time or times
prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan. 

2.    Manner of Exercise. 

(a)    The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the
Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of
Option Shares to be purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods:
(i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that
are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a
properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee
chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such
payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed
the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 
 (b)    The
shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable
laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be
the holder of, or to have any of the rights of a 

  
 2 

 
holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer
agent shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership
rights with respect to such shares of Stock. 
 (c)    The minimum number of shares with respect to which this Stock
Option may be exercised at any one time shall be 100 shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d)    Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable
after the Expiration Date hereof. 
 3.    Termination as Non-Employee
Director. If the Optionee ceases to be a None-Employee Director of the Company, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below. 

(a)    Termination Due to Death. If the Optionee’s service as a
Non-Employee Director terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised
by the Optionee’s legal representative or legatee for a period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate
immediately and be of no further force or effect. 
 (b)    Other Termination. If the Optionee ceases to be a Non-Employee Director for any reason other than the Optionee’s death, any portion of this Stock Option outstanding on such date may be exercised, to the extent exercisable on the date the Optionee ceased to be
a Non-Employee Director, for a period of six months from the date the Optionee ceased to be a Non-Employee Director or until the Expiration Date, if earlier. Any portion
of this Stock Option that is not exercisable on the date the Optionee ceases to be a Non-Employee Director shall terminate immediately and be of no further force or effect. 

4.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 5.    Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s
lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee. 

6.    No Obligation to Continue as a Non-Employee Director. Neither the
Plan nor this Stock Option confers upon the Optionee any rights with respect to continuance as a Non-Employee Director. 

  
 3 

 7.    Integration. This Agreement constitutes the entire
agreement between the parties with respect to this Stock Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

8.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future
equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant
Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider
appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

  
 4 

 9.    Notices. Notices hereunder shall be mailed or delivered to
the Company at its principal place of business and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

  

					
	CULLINAN MANAGEMENT, INC.
		
	By:	 	  

		 	Title:	 	

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 
  

					
	Dated:                     	 		 	  

		 	    	 	Optionee’s Signature
			
		 		 	Optionee’s name and address:
		 		 	  

		 		 	  

		 		 	  

  
 5

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