Document:

EX-10.2

 Exhibit 10.2 

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of September 21, 2020, by and between AILERON
THERAPEUTICS, INC., a Delaware corporation (the “Company”), and LINCOLN PARK CAPITAL FUND, LLC, an Illinois limited liability company (together with its permitted assigns, the “Buyer”). Capitalized
terms used herein and not otherwise defined herein shall have the respective meanings set forth in the Purchase Agreement by and between the parties hereto, dated as of the date hereof (as amended, restated, supplemented or otherwise modified from
time to time, the “Purchase Agreement”). 
 WHEREAS: 

The Company has the right, upon the terms and subject to the conditions of the Purchase Agreement, to sell and issue to the Buyer up to
Fifteen Million Dollars ($15,000,000) of Purchase Shares and to induce the Buyer to enter into the Purchase Agreement, the Company has agreed to provide certain registration rights under the Securities Act of 1933, as amended, and the rules and
regulations thereunder (collectively, the “Securities Act”), and applicable state securities laws. 
 NOW,
THEREFORE, in consideration of the promises and the mutual covenants contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and the Buyer hereby agree as follows:

 1. DEFINITIONS. 
 As
used in this Agreement, the following terms shall have the following meanings: 
 a. “Investor” means the Buyer, any
transferee or assignee thereof to whom the Buyer assigns its rights under this Agreement in accordance with Section 9 and who agrees to become bound by the provisions of this Agreement, and any transferee or assignee
thereof to whom a transferee or assignee assigns its rights under this Agreement in accordance with Section 9 and who agrees to become bound by the provisions of this Agreement. 

b. “Person” means any individual or entity including but not limited to any corporation, a limited liability company, an
association, a partnership, an organization, a business, an individual, a governmental or political subdivision thereof or a governmental agency. 

c. “Register,” “registered,” and “registration” refer to a registration effected by
preparing and filing one or more registration statements of the Company in compliance with the Securities Act and pursuant to Rule 415 under the Securities Act or any successor rule providing for offering securities on a continuous basis
(“Rule 415”), and the declaration or ordering of effectiveness of such registration statement(s) by the United States Securities and Exchange Commission (the “SEC”). 

d. “Registrable Securities” means all of the Initial Purchase Shares and Commitment Shares, and the Purchase Shares that may,
from time to time, be issued or become issuable to the Investor under the Purchase Agreement (without regard to any limitation or restriction on purchases), and any and all shares of capital stock issued or issuable with respect to the Purchase
Shares or the Commitment Shares or the Purchase Agreement as a result of any stock split, stock dividend, recapitalization, exchange or similar event or otherwise, without regard to any limitation on purchases under the Purchase Agreement. 

e. “Registration Statement” means one or more registration statements of the Company covering only the resale of the
Registrable Securities. 

  
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 2. REGISTRATION. 

a. Mandatory Registration. The Company shall, within ten (10) days from the date of this Agreement, file with the SEC an initial
Registration Statement covering the maximum number of Registrable Securities as the Company shall be permitted to be included thereon in accordance with applicable SEC rules, regulations and interpretations so as to permit the resale of such
Registrable Securities by the Investor under Rule 415 under the Securities Act at then prevailing market prices (and not fixed prices), as mutually determined by both the Company and the Investor in consultation with their respective legal counsel
(in any case including all of the Initial Purchase Shares and Commitment Shares), subject to the aggregate number of authorized shares of the Company’s Common Stock then available for issuance in its Certificate of Incorporation. The initial
Registration Statement shall register only the Registrable Securities. The Investor and its counsel shall have a reasonable opportunity to review and comment upon such Registration Statement and any amendment or supplement to such Registration
Statement and any related prospectus prior to its filing with the SEC, and the Company shall give due consideration to all comments. The Investor acknowledges that it will be identified in the initial Registration Statement as an underwriter within
the meaning of Section 2(a)(11) of the Securities Act and shall furnish all information reasonably requested by the Company for inclusion therein. The Company shall use reasonable best efforts to have the Registration Statement and any
amendment declared effective by the SEC as soon as practicable. The Company shall use reasonable best efforts to keep the Registration Statement effective pursuant to Rule 415 promulgated under the Securities Act and available for the resale by the
Investor of all of the Registrable Securities covered thereby at all times until the date on which the Investor shall have resold all the Registrable Securities covered thereby and no Available Amount remains under the Purchase Agreement (the
“Registration Period”). The Registration Statement (including any amendments or supplements thereto and prospectuses contained therein) shall not contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein, or necessary to make the statements therein, in light of the circumstances in which they were made, not misleading. 

b. Rule 424 Prospectus. The Company shall, as required by applicable securities regulations, from time to time file with the SEC,
pursuant to Rule 424 promulgated under the Securities Act, the prospectus and prospectus supplements, if any, to be used in connection with resales of the Registrable Securities by the Buyer under the Registration Statement. The Investor and its
counsel shall have a reasonable opportunity to review and comment upon such prospectus prior to its filing with the SEC, and the Company shall give due consideration to all comments. The Investor shall use its reasonable best efforts to provide any
such comments within one (1) Business Day from the date the Investor receives the final pre-filing version of such prospectus. 

c. Sufficient Number of Shares Registered. In the event the number of shares available under the Registration Statement is insufficient
to cover all of the Registrable Securities, the Company shall amend the Registration Statement or file a new Registration Statement (a “New Registration Statement”), so as to cover all of such Registrable Securities (subject to the
limitations set forth in Section 2(a)) as soon as practicable, but in any event not later than ten (10) Business Days after the necessity arises, subject to any limits that may be imposed by the SEC pursuant to Rule
415 under the Securities Act. The Company shall use its commercially reasonable efforts to cause such amendment and/or New Registration Statement to become effective as soon as practicable following the filing thereof. 

d. Offering. If the staff of the SEC (the “Staff”) or the SEC seeks to characterize any offering pursuant to a
Registration Statement filed pursuant to this Agreement as constituting an offering of securities that does not permit such Registration Statement to become effective and be used for resales by the Investor under Rule 415 at then-prevailing market
prices (and not fixed prices), or if after the filing of the initial Registration Statement with the SEC pursuant to Section 2(a), the Company is otherwise 

  
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required by the Staff or the SEC to reduce the number of Registrable Securities included in such initial Registration Statement, then the Company shall reduce the number of Registrable Securities
to be included in such initial Registration Statement (with the prior consent, which shall not be unreasonably withheld, delayed or conditioned, of the Investor and its legal counsel as to the specific Registrable Securities to be removed therefrom)
until such time as the Staff and the SEC shall so permit such Registration Statement to become effective and be used as aforesaid. In the event of any reduction in Registrable Securities pursuant to this paragraph, the Company shall file one or more
New Registration Statements in accordance with Section 2(c) until such time as all Registrable Securities have been included in Registration Statements that have been declared effective and the prospectus contained therein
is available for use by the Investor. Notwithstanding any provision herein or in the Purchase Agreement to the contrary, the Company’s obligations to register Registrable Securities (and any related conditions to the Investor’s
obligations) shall be qualified as necessary to comport with any requirement of the SEC or the Staff as addressed in this Section 2(d). 

3. RELATED OBLIGATIONS. 

With respect to the Registration Statement and whenever any Registrable Securities are to be registered pursuant to
Section 2, including on any New Registration Statement, the Company shall use its commercially reasonable efforts to effect the registration of the Registrable Securities in accordance with the intended method of
disposition thereof and, pursuant thereto, the Company shall have the following obligations: 
 a. The Company shall prepare and file with
the SEC such amendments (including post-effective amendments) and supplements to any Registration Statement and the prospectus used in connection with such Registration Statement, which prospectus is to be filed pursuant to Rule 424 promulgated
under the Securities Act, as may be necessary to keep the Registration Statement or any New Registration Statement effective at all times during the Registration Period, and, during such period, comply with the provisions of the Securities Act with
respect to the disposition of all Registrable Securities of the Company covered by the Registration Statement or any New Registration Statement until such time as all of such Registrable Securities shall have been disposed of in accordance with the
intended methods of disposition by the Investor as set forth in such Registration Statement. 
 b. The Company shall permit the Investor to
review and comment upon the Registration Statement or any New Registration Statement and all amendments and supplements thereto at least two (2) Business Days prior to their filing with the SEC, and not file any document in a form to which
Investor reasonably objects. The Investor shall use its commercially reasonable efforts to comment upon the Registration Statement or any New Registration Statement and any amendments or supplements thereto within two (2) Business Days from the
date the Investor receives the final version thereof. The Company shall furnish to the Investor, without charge any correspondence from the SEC or the staff of the SEC to the Company or its representatives relating to the Registration Statement or
any New Registration Statement. 
 c. Upon request of the Investor, the Company shall furnish to the Investor, (i) promptly after the
same is prepared and filed with the SEC, at least one copy of such Registration Statement and any amendment(s) thereto, including financial statements and schedules, all documents incorporated therein by reference and all exhibits, (ii) upon
the effectiveness of any Registration Statement, a copy of the prospectus included in such Registration Statement and all amendments and supplements thereto (or such other number of copies as the Investor may reasonably request) and (iii) such
other documents, including copies of any preliminary or final prospectus, as the Investor may reasonably request from time to time in order to facilitate the disposition of the Registrable Securities owned by the Investor. For the avoidance of
doubt, any filing available to the Investor via the SEC’s live EDGAR system shall be deemed “furnished to the Investor” hereunder. 

  
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 d. The Company shall use commercially reasonable efforts to (i) register and qualify
the Registrable Securities covered by a Registration Statement under such other securities or “blue sky” laws of such jurisdictions in the United States as the Investor reasonably requests, (ii) prepare and file in those
jurisdictions, such amendments (including post-effective amendments) and supplements to such registrations and qualifications as may be necessary to maintain the effectiveness thereof during the Registration Period, (iii) take such other
actions as may be necessary to maintain such registrations and qualifications in effect at all times during the Registration Period, and (iv) take all other actions reasonably necessary or advisable to qualify the Registrable Securities for
sale in such jurisdictions; provided, however, that the Company shall not be required in connection therewith or as a condition thereto to (x) qualify to do business in any jurisdiction where it would not otherwise be required to qualify but
for this Section 3(d), (y) subject itself to general taxation in any such jurisdiction, or (z) file a general consent to service of process in any such jurisdiction. The Company shall promptly notify the Investor who
holds Registrable Securities of the receipt by the Company of any notification with respect to the suspension of the registration or qualification of any of the Registrable Securities for sale under the securities or “blue sky” laws of any
jurisdiction in the United States or its receipt of actual notice of the initiation or threatening of any proceeding for such purpose. 
 e.
As promptly as practicable after becoming aware of such event or facts, the Company shall notify the Investor of the happening of any event or existence of such facts as a result of which the prospectus included in any Registration Statement, as
then in effect, includes an untrue statement of a material fact or omits to state a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading
(provided that in no event shall such notice contain any material, non-public information regarding the Company), and promptly prepare a supplement or amendment to such Registration Statement to correct such
untrue statement or omission, and deliver a copy of such supplement or amendment to the Investor (or such other number of copies as the Investor may reasonably request). The Company shall also promptly notify the Investor in writing (i) when a
prospectus or any prospectus supplement or post-effective amendment has been filed, and when a Registration Statement or any post-effective amendment has become effective (notification of such effectiveness shall be delivered to the Investor by
email or facsimile on the same day of such effectiveness or by overnight mail), (ii) of any request by the SEC for amendments or supplements to any Registration Statement or related prospectus or related information, and (iii) of the
Company’s reasonable determination that a post-effective amendment to a Registration Statement would be appropriate. 
 f. The Company
shall use its commercially reasonable efforts to prevent the issuance of any stop order or other suspension of effectiveness of any Registration Statement, or the suspension of the qualification of any Registrable Securities for sale in any
jurisdiction and, if such an order or suspension is issued, to obtain the withdrawal of such order or suspension at the earliest possible moment and to notify the Investor of the issuance of such order and the resolution thereof or its receipt of
actual notice of the initiation or threat of any proceeding for such purpose. 
 g. The Company shall (i) cause all the Registrable
Securities to be listed on each securities exchange on which securities of the same class or series issued by the Company are then listed, if any, if the listing of such Registrable Securities is then permitted under the rules of such exchange, or
(ii) secure designation and quotation of all the Registrable Securities on the Principal Market. The Company shall pay all fees and expenses in connection with satisfying its obligation under this Section 3. 

h. The Company shall comply with Section 6(b) of the Purchase Agreement with respect to the issuance of Registrable
Securities. 

  
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 i. The Company shall at all times provide a transfer agent and registrar with respect to its
Common Stock. 
 j. If reasonably requested by the Investor, the Company shall (i) as soon as practicable after receipt of written
notice from the Investor, incorporate in a prospectus supplement or post-effective amendment such information as the Investor reasonably believes necessary to be included therein relating to the sale and distribution of Registrable Securities,
including, without limitation, information with respect to the number of Registrable Securities being sold, the purchase price being paid therefor and any other terms of the offering of the Registrable Securities; (ii) make all required filings
of such prospectus supplement or post-effective amendment as soon as practicable after being notified of the matters to be incorporated in such prospectus supplement or post-effective amendment; and (iii) supplement or make amendments to any
Registration Statement. 
 k. The Company shall use its commercially reasonable efforts to cause the Registrable Securities covered by any
Registration Statement to be registered with or approved by such other governmental agencies or authorities as may be necessary to consummate the disposition of such Registrable Securities. 

l. On the date any Registration Statement which includes the Registrable Securities is declared effective by the SEC, the Company shall
deliver, and shall cause its legal counsel for the Company to deliver, to the transfer agent for such Registrable Securities (with copies to the Investor) confirmation that such Registration Statement has been declared effective by the SEC
substantially in the form attached hereto as Exhibit A, or such other form agreed to by the Investor. Thereafter, if reasonably requested by the Buyer at any time, the Company (acting directly or through its counsel) shall deliver to the
Buyer, which may be via e-mail, a written confirmation whether or not the effectiveness of such Registration Statement has lapsed at any time for any reason (including, without limitation, the issuance of a
stop order by the SEC) and whether or not the Registration Statement is available to the Buyer for sale of all of the Registrable Securities. 

m. Company agrees to take all other reasonable actions as necessary and reasonably requested in writing by the Investor to expedite and
facilitate disposition by the Investor of the Registrable Securities pursuant to any Registration Statement. 
 4. OBLIGATIONS OF THE
INVESTOR. 
 a. The Company shall notify the Investor in writing of the information the Company reasonably requires from the Investor in
connection with any Registration Statement hereunder. The Investor shall as soon as practicable furnish to the Company such information regarding itself, the Registrable Securities held by it and the intended method of disposition of the Registrable
Securities held by it as shall be reasonably required to effect the registration of such Registrable Securities and shall execute such documents in connection with such registration as the Company may reasonably request. 

b. The Investor agrees to cooperate with the Company as reasonably requested by the Company in connection with the preparation and filing of
any Registration Statement hereunder and any amendments and supplements thereto. 
 c. The Investor agrees that, upon receipt of any notice
from the Company of the happening of any event or existence of facts of the kind described in Section 3(f) or the first sentence of 3(e), the Investor will immediately discontinue disposition of Registrable Securities
pursuant to any Registration Statement(s) covering such Registrable Securities until the Investor’s receipt of the copies of 

  
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a notice regarding the resolution or withdrawal of the stop order or suspension as contemplated by Section 3(f) or the supplemented or amended prospectus as contemplated
by the first sentence of 3(e). Notwithstanding anything to the contrary, the Company shall cause its transfer agent to promptly deliver shares of Common Stock without any restrictive legend in accordance with the terms of the Purchase
Agreement in connection with any sale of Registrable Securities with respect to which an Investor has entered into a contract for sale prior to the Investor’s receipt of a notice from the Company to the Investor of the happening of any event of
the kind described in Section 3(f) or the first sentence of Section 3(e) and for which the Investor has not yet settled. 

5. EXPENSES OF REGISTRATION. 

All reasonable expenses, other than sales or brokerage commissions, incurred in connection with registrations, filings or qualifications
pursuant to Sections 2 and 3, including, without limitation, all registration, listing and qualifications fees, printers and accounting fees, and fees and disbursements of counsel for the Company, shall be paid by the Company. 

6. INDEMNIFICATION. 
 a. To
the fullest extent permitted by law, the Company will, and hereby does, indemnify, hold harmless and defend the Investor, each Person, if any, who controls the Investor, the members, directors, officers, partners, employees, agents, managers, and
representatives of the Investor and each Person, if any, who controls the Investor within the meaning of the Securities Act or the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (each, an “Indemnified
Person”), against any losses, claims, damages, liabilities, judgments, fines, penalties, charges, costs, reasonable attorneys’ fees, amounts paid in settlement or reasonable expenses, joint or several, (collectively,
“Claims”) reasonably incurred in investigating, preparing or defending any action, claim, suit, inquiry, proceeding, investigation or appeal taken from the foregoing by or before any court or governmental, administrative or other
regulatory agency, body or the SEC, whether pending or threatened, whether or not an indemnified party is or may be a party thereto (“Indemnified Damages”), to which any of them may become subject insofar as such Claims (or actions
or proceedings, whether commenced or threatened, in respect thereof) arise out of or are based upon: (i) any untrue statement or alleged untrue statement of a material fact in the Registration Statement, any New Registration Statement or any
post-effective amendment thereto or in any filing made in connection with the qualification of the offering under the securities or other “blue sky” laws of any jurisdiction in which Registrable Securities are offered (“Blue Sky
Filing”), or the omission or alleged omission to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (ii) any untrue statement or alleged untrue statement of a material fact
contained in the final prospectus (as amended or supplemented, if the Company files any amendment thereof or supplement thereto with the SEC) or the omission or alleged omission to state therein any material fact necessary to make the statements
made therein, in light of the circumstances under which the statements therein were made, not misleading, (iii) any violation or alleged violation by the Company of the Securities Act, the Exchange Act, any other law, including, without
limitation, any state securities law, or any rule or regulation thereunder relating to the offer or sale of the Registrable Securities pursuant to the Registration Statement or any New Registration Statement or (iv) any material violation by
the Company of this Agreement (the matters in the foregoing clauses (i) through (iv) being, collectively, “Violations”). The Company shall reimburse each Indemnified Person promptly as such expenses are incurred and are due and
payable, for any reasonable and documented legal fees or other reasonable expenses incurred by them in connection with investigating or defending any such Claim. Notwithstanding anything to the contrary contained herein, the indemnification
agreement contained in this Section 6(a): (i) shall not apply to a Claim by an Indemnified Person arising out of or based upon a Violation which occurs in reliance upon and in conformity with information about the Investor
furnished in writing to the Company by such Indemnified Person expressly for use in connection with the preparation of the Registration Statement, any New 

  
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Registration Statement or any such amendment thereof or supplement thereto or prospectus contained therein, if such Registration Statement, New Registration Statement or amendment thereof or
supplement thereto or prospectus was timely made available by the Company pursuant to Section 3(c) or Section 3(e); (ii) with respect to any superseded prospectus, shall not inure to the benefit of
any Indemnified Person from whom the Indemnified Person asserting any such Claim purchased the Registrable Securities that are the subject thereof (or to the benefit of any person controlling such Indemnified Person) if the untrue statement or
omission of material fact contained in the superseded prospectus was corrected in the revised prospectus, as then amended or supplemented, if such revised prospectus was timely made available by the Company pursuant to Section 3(c) or
Section 3(e), and the Indemnified Person was promptly advised in writing not to use the incorrect prospectus prior to the use giving rise to a violation and such Indemnified Person, notwithstanding such advice, used it; (iii) shall not be
available to the extent such Claim is based on a failure of the Investor to deliver or to cause to be delivered the prospectus made available by the Company, if such prospectus was timely made available by the Company pursuant to
Section 3(c) or Section 3(e); and (iv) shall not apply to amounts paid in settlement of any Claim if such settlement is effected without the prior written consent of the Company, which consent
shall not be unreasonably withheld, delayed or conditioned. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of the Indemnified Person and shall survive the transfer of the rights and
obligations hereunder pursuant to Section 9. 
 b. In connection with the Registration Statement or any New
Registration Statement, the Investor agrees to indemnify, hold harmless and defend, to the same extent and in the same manner as is set forth in Section 6(a), the Company, each of its directors, each of its officers who
signs the Registration Statement or any New Registration Statement, each Person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act (collectively and together with an Indemnified Person, an
“Indemnified Party”), against any Claim or Indemnified Damages to which any of them may become subject, under the Securities Act, the Exchange Act or otherwise, insofar as such Claim or Indemnified Damages arise out of or are based
upon any Violation, in each case to the extent, and only to the extent, that such Violation occurs in reliance upon and in conformity with written information about the Investor set forth on Exhibit B attached hereto and furnished to the
Company by the Investor expressly for use in connection with such Registration Statement (as such information about the Investor may be updated and furnished to the Company by the Investor expressly for use in connection with any New Registration
Statement or prospectus); and, subject to Section 6(d), the Investor will reimburse any legal or other expenses reasonably incurred by any Indemnified Party in connection with investigating or defending any such Claim;
provided, however, that the indemnity agreement contained in this Section 6(b) and the agreement with respect to contribution contained in Section 7 shall not apply to amounts paid in settlement of any Claim if such
settlement is effected without the prior written consent of the Investor, which consent shall not be unreasonably withheld, delayed or conditioned; provided, further, however, that the Investor shall be liable under this
Section 6(b) for only that amount of a Claim or Indemnified Damages as does not exceed the net proceeds to the Investor as a result of the sale of Registrable Securities pursuant to such Registration Statement. Such
indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of such Indemnified Party and shall survive the transfer of the Registrable Securities by the Investor pursuant to
Section 9. 
 c. Promptly after receipt by an Indemnified Person or Indemnified Party under this
Section 6 of notice of the commencement of any action or proceeding (including any governmental action or proceeding) involving a Claim, such Indemnified Person or Indemnified Party shall, if a Claim in respect thereof is
to be made against any indemnifying party under this Section 6, deliver to the indemnifying party a written notice of the commencement thereof, and the indemnifying party shall have the right to participate in, and, to the
extent the indemnifying party so desires, jointly with any other indemnifying party similarly noticed, to assume control of the defense thereof with counsel mutually satisfactory to the indemnifying party and the Indemnified Person or the
Indemnified Party, as the case may be; provided, however, that an 

  
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Indemnified Person or Indemnified Party shall have the right to retain its own counsel with the fees and expenses to be paid by the indemnifying party, if, in the reasonable opinion of counsel
retained by the indemnifying party, the representation by such counsel of the Indemnified Person or Indemnified Party and the indemnifying party would be inappropriate due to actual or potential differing interests between such Indemnified Person or
Indemnified Party and any other party represented by such counsel in such proceeding. The Indemnified Party or Indemnified Person shall cooperate fully with the indemnifying party in connection with any negotiation or defense of any such action or
claim by the indemnifying party and shall furnish to the indemnifying party all information reasonably available to the Indemnified Party or Indemnified Person which relates to such action or claim. The indemnifying party shall keep the Indemnified
Party or Indemnified Person fully apprised at all times as to the status of the defense or any settlement negotiations with respect thereto. No indemnifying party shall be liable for any settlement of any action, claim or proceeding effected without
its written consent, provided, however, that the indemnifying party shall not unreasonably withhold, delay or condition its consent. No indemnifying party shall, without the consent of the Indemnified Party or Indemnified Person, consent to entry of
any judgment or enter into any settlement or other compromise which does not include as an unconditional term thereof the giving by the claimant or plaintiff to such Indemnified Party or Indemnified Person of a release from all liability in respect
to such claim or litigation. Following indemnification as provided for hereunder, the indemnifying party shall be subrogated to all rights of the Indemnified Party or Indemnified Person with respect to all third parties, firms or corporations
relating to the matter for which indemnification has been made. The failure to deliver written notice to the indemnifying party within a reasonable time of the commencement of any such action shall not relieve such indemnifying party of any
liability to the Indemnified Person or Indemnified Party under this Section 6, except to the extent that the indemnifying party is prejudiced in its ability to defend such action. 

d. The indemnification required by this Section 6 shall be made by periodic payments of the amount thereof during the
course of the investigation or defense, as and when bills are received or Indemnified Damages are incurred. 
 e. The indemnity agreements
contained herein shall be in addition to (i) any cause of action or similar right of the Indemnified Party or Indemnified Person against the indemnifying party or others, and (ii) any liabilities the indemnifying party may be subject to
pursuant to applicable law. 
 7. CONTRIBUTION. 

To the extent any indemnification by an indemnifying party is prohibited or limited by law, the indemnifying party agrees to make the maximum
contribution with respect to any amounts for which it would otherwise be liable under Section 6 to the fullest extent permitted by law; provided, however, that: (i) no seller of Registrable Securities guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any seller of Registrable Securities who was not guilty of fraudulent misrepresentation; and (ii) contribution
by any seller of Registrable Securities shall be limited in amount to the net amount of proceeds received by such seller from the sale of such Registrable Securities. 

8. REPORTS AND DISCLOSURE UNDER THE SECURITIES ACT. 

With a view to making available to the Investor the benefits of Rule 144 promulgated under the Securities Act or any other similar rule or
regulation of the SEC that may at any time permit the Investor to sell securities of the Company to the public without registration (“Rule 144”), the Company agrees, at the Company’s sole expense, so long as the Investor owns
Registrable Securities: 
 a. make and keep public information available, as those terms are understood and defined in Rule 144; 

  
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 b. 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 so long as the Company remains subject to such requirements and the filing of such reports and other documents is required for the applicable provisions of Rule 144; 

c. furnish to the Investor so long as the Investor owns Registrable Securities, promptly upon request, (i) a written statement by the
Company that it has complied with the reporting and or disclosure provisions of Rule 144, the Securities Act and the Exchange Act, (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 to permit the Investor to sell such securities pursuant to Rule 144 without registration; and 

d. take such additional action as is reasonably requested by the Investor to enable the Investor to sell the Registrable Securities pursuant to
Rule 144, including, without limitation, delivering all such legal opinions, consents, certificates, resolutions and instructions to the Company’s Transfer Agent as may be reasonably requested from time to time by the Investor and otherwise
fully cooperate with Investor and Investor’s broker to effect such sale of securities pursuant to Rule 144. 
 The Company agrees that
damages may be an inadequate remedy for any breach of the terms and provisions of this Section 8 and that Investor shall, whether or not it is pursuing any remedies at law, be entitled to seek equitable relief in the form
of a preliminary or permanent injunction, without having to post any bond or other security, upon any breach or threatened breach of any such terms or provisions. 

9. ASSIGNMENT OF REGISTRATION RIGHTS. 

The Company shall not assign this Agreement or any rights or obligations hereunder without the prior written consent of the Investor; provided,
however, that any transaction, whether by merger, reorganization, restructuring, consolidation, financing or otherwise, whereby the Company remains the surviving entity immediately after such transaction shall not be deemed an assignment. The
Investor may not assign its rights under this Agreement without the written consent of the Company, other than to an affiliate of the Investor controlled by Jonathan Cope or Josh Scheinfeld, in which case the assignee must agree in writing to be
bound by the terms and conditions of this Agreement. 
 10. AMENDMENT OF REGISTRATION RIGHTS. 

No provision of this Agreement may be amended or waived by the parties from and after the date that is one (1) Business Day immediately
preceding the initial filing of the Registration Statement with the SEC. Subject to the immediately preceding sentence, no provision of this Agreement may be (i) amended other than by a written instrument signed by both parties hereto or
(ii) waived other than in a written instrument signed by the party against whom enforcement of such waiver is sought. Failure of any party to exercise any right or remedy under this Agreement or otherwise, or delay by a party in exercising such
right or remedy, shall not operate as a waiver thereof. 

  
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 11. MISCELLANEOUS. 

a. A Person is deemed to be a holder of Registrable Securities whenever such Person owns or is deemed to own of record such Registrable
Securities. If the Company receives conflicting instructions, notices or elections from two or more Persons with respect to the same Registrable Securities, the Company shall act upon the basis of instructions, notice or election received from the
registered owner of such Registrable Securities. 
 b. Any notices, consents, waivers or other communications required or permitted to be
given under the terms of this Agreement must be in writing and will be deemed to have been delivered: (i) upon receipt, when delivered personally; (ii) upon receipt, when sent by facsimile or email (provided confirmation of transmission is
mechanically or electronically generated and kept on file by the sending party); or (iii) one (1) Business Day after deposit with a nationally recognized overnight delivery service, in each case properly addressed to the party to receive the
same. The addresses for such communications shall be: 
 If to the Company: 

Aileron Therapeutics, Inc. 
 490
Arsenal Way, Suite 210 
 Watertown, MA 02472 

Telephone: 617-995-0900 

E-mail:                
rwanstall@aileronrx.com 
 Attention:            Rick Wanstall 

With a copy to (which shall not constitute notice or service of process): 

Wilmer Cutler Pickering Hale and Dorr, LLP 

60 State Street 
 Boston, MA 02109

 Telephone:         617.526.6000 

Facsimile:          617.526.5000 

E-mail:               
stuart.falber@wilmerhale.com 
 Attention:           Stuart M. Falber 

If to the Investor: 
 Lincoln
Park Capital Fund, LLC 
 440 North Wells, Suite 410 

Chicago, IL 60654 
 Telephone:
        312.822.9300 
 Facsimile:         312.822.9301 

E-mail:
             jscheinfeld@lpcfunds.com or jcope@lpcfunds.com 
 Attention:
        Josh Scheinfeld or Jonathan Cope 
 With a copy to (which shall not constitute notice or
service of process): 
 K&L Gates, LLP 

200 S. Biscayne Blvd., Ste. 3900 

Miami, Florida 33131 
 Telephone:
      305.539.3306 
 Facsimile:         305.358.7095 

E-mail:              
clayton.parker@klgates.com 
 Attention:         Clayton E. Parker, Esq. 

  
 10 

 or at such other address, email address and/or facsimile number and/or to the attention of such other person
as the recipient party has specified by written notice given to each other party at least three (3) Business Days prior to the effectiveness of such change. Written confirmation of receipt (A) given by the recipient of such notice,
consent, waiver or other communication, (B) mechanically or electronically generated by the sender’s facsimile machine or email account containing the time, date, recipient facsimile number or email address, as applicable, or
(C) provided by a nationally recognized overnight delivery service, shall be rebuttable evidence of personal service, receipt by facsimile, email or receipt from a nationally recognized overnight delivery service in accordance with clause (i),
(ii) or (iii) above, respectively. 
 c. All other questions concerning the construction, validity, enforcement and interpretation of
this Agreement shall be governed by the internal laws of the State of New York, without giving effect to any choice of law or conflict of law provision or rule (whether of the State of Illinois or any other jurisdictions) that would cause the
application of the laws of any jurisdictions other than the State of New York. Each party hereby irrevocably submits to the exclusive jurisdiction of and venue in the U.S. District Court for the Southern District of New York or, if that court does
not have subject matter jurisdiction, in any state court located in the City and County of New York, for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein, and hereby
irrevocably waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit, action or proceeding is brought in an inconvenient forum or that the
venue of such suit, action or proceeding is improper. Each party hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding by mailing a copy thereof to such party at the address
for such notices to it under this Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process in any
manner permitted by law. If any provision of this Agreement shall be invalid or unenforceable in any jurisdiction, such invalidity or unenforceability shall not affect the validity or enforceability of the remainder of this Agreement in that
jurisdiction or the validity or enforceability of any provision of this Agreement in any other jurisdiction. EACH PARTY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE
HEREUNDER OR IN CONNECTION HEREWITH OR ARISING OUT OF THIS AGREEMENT OR ANY TRANSACTION CONTEMPLATED HEREBY. 
 d. This Agreement and the
Purchase Agreement constitute the entire agreement among the parties hereto with respect to the subject matter hereof and thereof. There are no restrictions, promises, warranties or undertakings among the parties hereto, other than those set forth
or referred to herein and therein. This Agreement and the Purchase Agreement supersede all prior agreements and understandings among the parties hereto with respect to the subject matter hereof and thereof. 

e. Subject to the requirements of Section 9, this Agreement shall inure to the benefit of and be binding upon the
successors and permitted assigns of each of the parties hereto. 
 f. The headings in this Agreement are for convenience of reference only
and shall not limit or otherwise affect the meaning hereof. 
 g. This Agreement may be executed in identical counterparts, each of which
shall be deemed an original but all of which shall constitute one and the same agreement. This Agreement, once executed by a party, may be delivered to the other party hereto by facsimile transmission or by
e-mail in a “.pdf” format data file of a copy of this Agreement bearing the signature of the party so delivering this Agreement. 

  
 11 

 h. Each party shall do and perform, or cause to be done and performed, all such further acts
and things, and shall execute and deliver all such other agreements, certificates, instruments and documents, as the other party may reasonably request in order to carry out the intent and accomplish the purposes of this Agreement and the
consummation of the transactions contemplated hereby. 
 i. The language used in this Agreement will be deemed to be the language chosen by
the parties to express their mutual intent and no rules of strict construction will be applied against any party. 
 j. This Agreement is
intended for the benefit of the parties hereto and their respective successors and permitted assigns, and is not for the benefit of, nor may any provision hereof be enforced by, any other Person. 

12. TERMINATION. 
 The
obligations of the Company contained in Sections 2, 3, 5 and 8 of this Agreement shall terminate in their entirety upon the earlier of (i) the date on which the Investor shall have sold all the Securities and no Available Amount remains under
the Purchase Agreement and (ii) 180 days following the earlier of (A) the Maturity Date and (B) the date of termination of the Purchase Agreement; provided that as long as any Securities remain unsold by the Investor, the Company must make
available “current public information” pursuant to Rule 144 promulgated under the Securities Act until the Investor may sell the Securities thereunder without any restrictions (including any restrictions under Rule 144(c) or Rule 144(i)).

 * * * * * * 

  
 12 

 IN WITNESS WHEREOF, the parties have caused this Registration Rights Agreement to be
duly executed as of day and year first above written. 
  

			
	THE COMPANY:
	
	AILERON THERAPEUTICS, INC.
		
	By:	 	 /s/ Richard J. Wanstall

	Name: Richard J. Wanstall
	Title: Chief Financial Officer
	
	BUYER:
	
	LINCOLN PARK CAPITAL FUND, LLC
	BY: LINCOLN PARK CAPITAL, LLC
	BY: ALEX NOAH INVESTORS, INC.
		
	By:	 	 /s/ Jonathan Cope

	Name: Jonathan Cope
	Title: President

  
 13EX-4.2

 Exhibit 4.2 

Boqii Holding Limited 
  

			
	Number                	  	Class A Ordinary Share(s)

 INCORPORATED UNDER THE LAWS OF THE CAYMAN ISLANDS 

Share capital is US$200,000 divided into 200,000,000 shares of par value of US$0.01 each; comprising 

(a) 129,500,000 Class A Ordinary Shares of a par value
of US$0.001 each, 
 (b) 15,000,000 Class B Ordinary Shares of a par value
of US$0.001 each, and 
 (c) 55,500,000 shares of a par value
of US$0.001 each of such Class or Classes (however designated) 
 THIS IS TO CERTIFY THAT
                 IS THE REGISTERED HOLDER OF
                 CLASS A ORDINARY SHARES IN THE ABOVE-NAMED COMPANY SUBJECT TO THE MEMORANDUM AND ARTICLES OF ASSOCIATION THEREOF. 

EXECUTED ON BEHALF OF THE SAID COMPANY OF THE          DAY OF
                 BY: 
 DIRECTOR

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