Registration Rights Agreement



 Exhibit 10.5 
 [***] Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted
portions. 
 PUMA BIOTECHNOLOGY, INC. 
 REGISTRATION RIGHTS AGREEMENT 
 This REGISTRATION RIGHTS AGREEMENT (this
“Agreement”) is made as of October 4, 2011, by and among Puma Biotechnology, Inc., a Delaware corporation (the “Company”), each person listed on Exhibit A attached hereto (collectively, the
“Investors” and each individually, an “Investor”), and Innovative Acquisitions Corp., a Delaware corporation (“IAC”), but only for purposes of assuming all of the Company’s rights, duties and
obligations hereunder pursuant to Section 8. Capitalized terms used herein and not otherwise defined shall have the meanings ascribed to them in Section 9(q) herein. 

BACKGROUND 
 The
Company has agreed to issue and sell to the Investors, and the Investors have agreed to purchase from the Company: up to an aggregate of 14,666,733 shares of the Company’s Common Stock, par value $0.0001 per share (the “Common
Stock”), and warrants (as originally issued by the Company and as the same shall be assumed and/or substituted by IAC in connection with the Merger, the “Warrants”) to purchase an indeterminate number of shares of the
Common Stock, upon the terms and conditions set forth in that certain Stock Purchase Agreement, dated of even date herewith, by and among the Company and the Investors (the “Purchase Agreement”). 

AGREEMENT 
 1.
Shelf Registration. So long as any Registrable Shares are outstanding, the Company shall take the following actions: 
 (a) The Company shall, as soon as practicable but in any event by the Filing Deadline, file with the Securities and Exchange Commission (the “Commission”), and thereafter use its
reasonable best efforts to cause to be declared effective as soon as practicable but in any event no later than the Effectiveness Deadline, an initial registration statement (the “Shelf Registration Statement”) on an appropriate
form under the Securities Act relating to the offer and sale of the Registrable Shares by the Holders thereof from time to time in accordance with the methods of distribution set forth in the Shelf Registration Statement and Rule 415 under the
Securities Act (hereinafter, the “Shelf Registration”). Such Shelf Registration Statement shall include the plan of distribution attached hereto as Exhibit A, as may be modified in response to any comments received from the
Commission. Other than the offer and sale of shares of Common Stock issued in the Subsequent Financing, without the prior written consent of the Holders of a majority of the number of Registrable Shares, no Shelf Registration Statement relating to
the offer and sale of Registrable Shares shall register any other transaction in any other securities of the Company. 

  
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 Notwithstanding the foregoing, if the Commission prevents the Company from including any or
all of the Registrable Shares on the initial Shelf Registration Statement due to limitations on the use of Rule 415 of the Securities Act for the resale of the Registrable Securities by the Holders (a “Rule 415 Limitation”), the
initial Shelf Registration Statement shall register the resale of a number of shares of Common Stock which is equal to the maximum number of shares as is permitted by the Commission, and, subject to the provisions of this Section 1(a),
the Company shall continue to its use reasonable best efforts to register all remaining Registrable Shares as set forth in this Section 1. In such event, the number of shares of Common Stock to be registered for each Holder in the
initial Shelf Registration Statement shall be reduced pro rata among all Holders, provided, however, that, prior to reducing the number of shares of Common Stock to be registered for any Holder in such Shelf Registration Statement, the
Company shall first remove any shares of Common Stock to be registered for any Person other than a Holder that was proposed to be included in such Shelf Registration Statement. The Company shall continue to use its reasonable best efforts to
register all remaining Registrable Shares as promptly as practicable in accordance with the applicable rules, regulations and guidance of the Commission, but in no event will the Company file a subsequent Shelf Registration Statement with respect to
the registration of the resale of Registrable Shares held by the Holders earlier than 180 calendar days following the effective date of the initial Shelf Registration Statement. Notwithstanding anything herein to the contrary, if the Commission, by
written comment, limits the Company’s ability to file, or prohibits or delays the filing of, a Shelf Registration Statement with respect to any or all the Registrable Shares which were not included in the initial Shelf Registration Statement (a
“Subsequent Shelf Limitation”), the Company’s compliance with such limitation, prohibition or delay solely to the extent of such limitation, prohibition or delay shall not be a breach or default by the Company under this
Agreement and shall not be deemed a failure by the Company to use “reasonable efforts,” “reasonable best efforts” or “best efforts” as set forth above or elsewhere in this Agreement and shall not require the payment of
any liquidated damages by the Company under this Agreement (including pursuant to Section 1(d)). Unless otherwise specifically stated herein, the term “Shelf Registration Statement” shall refer individually to the initial Shelf
Registration Statement and to each subsequent Shelf Registration Statement, if any. 
 (b) The Company shall use
its reasonable best efforts to keep the Shelf Registration Statement continuously effective, in order to permit the prospectus included therein to be lawfully delivered by the Holders of the Registrable Shares included therein, until the earlier of
the date on which all Registrable Shares cease to be Registrable Shares and the second anniversary of the date the Shelf Registration Statement is declared effective (such period being called the “Shelf Registration Period”). The
Company shall be deemed not to have used its reasonable best efforts to keep the Shelf Registration Statement effective during the Shelf Registration Period if it voluntarily takes, or fails to take, any action that would directly result in Holders
of Registrable Shares covered thereby not being able to offer and sell such Registrable Shares during such period, unless such action is required by applicable law or except as provided in Section 3(h). 

  
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 (c) Notwithstanding any other provisions of this Agreement to the contrary,
the Company shall cause (i) the Shelf Registration Statement (as of the effective date of Shelf Registration Statement), any amendment thereof (as of the effective date thereof) or supplement thereto (as of its date), (A) to comply in all
material respects with the applicable requirements of the Securities Act and the rules and regulations of the Commission and (B) not to contain any untrue statement of a material fact or omit to state a material fact required to be stated
therein or necessary in order to make the statements therein not misleading, and (ii) any related prospectus, preliminary prospectus or Free Writing Prospectus and any amendment thereof or supplement thereto, as of its date, (A) to comply
in all material respects with the applicable requirements of the Securities Act and the rules and regulations of the Commission and (B) not to contain any untrue statement of a material fact or omit to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading; provided, however, the Company shall have no such obligations or liabilities with respect to any
written information pertaining to any Holder and furnished to the Company by or on behalf of such Holder specifically for inclusion therein. 
 (d) If (i) the initial Shelf Registration Statement is not filed by the Filing Deadline or (ii) the Company suspends (other than as permitted pursuant to Section 3(h)(iv) or as required to
satisfy a request under Section 3(a)) or terminates the Shelf Registration Statement prior to the second anniversary of the effective date of Shelf Registration Statement, and such suspension or termination, alone or when taken together with
all other suspensions during the preceding 12-month period, if any, exceeds 60 days (the “Permissible Deferral Period”), then in each such case the Company will make pro rata payments to each Holder that continues to hold
Registrable Common Shares, as liquidated damages and not as a penalty, in an amount equal to 1.0% of the aggregate purchase price paid by such Holder to acquire the Registrable Common Shares then held by such Holder for each 30-calendar day period
(or pro rata portion thereof) following (A) the Filing Deadline through and until the Company shall have filed the initial Shelf Registration Statement with the Commission or (B) any Permissible Deferral Period during which the
Shelf Registration Statement is unavailable (for the purposes of this paragraph, each such period shall be referred to as a “Blackout Period” for the Shelf Registration Statement); provided, however, that in no event shall
the aggregate liquidated damages payable by the Company to any Holder as a result of any suspension or termination described in clause (d)(ii) exceed 10% of the aggregate purchase price paid by such Holder for all Common Stock acquired by such
Holder pursuant to the Purchase Agreement. The amounts payable as liquidated damages pursuant to this paragraph shall be paid in lawful money of the United States within three (3) Business Days of the last day of each 30-calendar day period
following the commencement of a Blackout Period until the termination of such Blackout Period. 
 (e) The Company
shall use its best efforts to qualify the Registrable Shares included in the Shelf Registration Statement for listing on a national securities exchange or comparable trading system within 12 months of the date the Shelf Registration Statement is
declared effective. 

  
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 2. Co-Sale Right. In the event that the Company proposes to register for resale all
or any portion of the shares of the Common Stock held by the Founder in a firm commitment underwritten offering, the Company shall give prompt written notice to the Holders of its intention to effect such an offering and shall include in such
offering a pro rata portion of any Holder’s Registrable Shares (based on the relative ownership percentages of the Founder and such Investor) for which the Company has received a written request from such Holder for inclusion therein
within fifteen (15) days after receipt of the Company’s notice. Notwithstanding the foregoing, if the managing underwriter advises the Company that in its opinion the number of shares requested to be included in such offering exceeds the
number that can be sold in such offering without having an adverse effect on such offering, including the price at which such shares can be sold, then the Company shall include in such offering the maximum number of shares that such underwriter
advises can be so sold without having such effect, allocated pro rata to the shares of Common Stock of the Founder and the Registrable Shares of the Holders that request inclusion in such offering in accordance with their respective ownership
percentages of the outstanding shares of Common Stock. 
 3. Registration Procedures. In connection with the Shelf
Registration contemplated by Section 1 hereof, the following provisions shall apply: 
 (a) At the
time the Commission declares the Shelf Registration Statement effective, each Holder shall be named as a selling security holder in the Shelf Registration Statement and the related prospectus in such a manner as to permit such Holder to deliver such
prospectus to purchasers of Registrable Shares included in the Shelf Registration Statement in accordance with applicable law, subject to the terms and conditions hereof. From and after the date the Shelf Registration Statement is declared
effective, any Holder not named as a selling stockholder in the Shelf Registration Statement at the time of effectiveness may request that the Company amend or supplement the Shelf Registration Statement to include such Holder as a selling
stockholder, and the Company shall, as promptly as practicable and in any event upon the later of (x) five (5) Business Days after such date or (y) five (5) Business Days after the expiration of any Deferral Period (as defined in
Section 3(h)) that is either in effect or put into effect within five (5) Business Days of such date: 
 (i) if required by applicable law, prepare and file with the Commission a post-effective amendment to the Shelf Registration Statement or prepare and, if required by applicable law, file a supplement to
the related prospectus or a supplement or amendment to any document incorporated therein by reference or file with the Commission any other required document so that the Holder is named as a selling security holder in the Shelf Registration
Statement and the related prospectus in such a manner as to permit such Holder to deliver such prospectus to purchasers of such Holder’s Registrable Shares included in the Shelf Registration Statement in accordance with applicable law and, if
the Company shall file a post-effective amendment to the Shelf Registration Statement, use its reasonable best efforts to cause such post-effective amendment to be declared effective under the Securities Act as promptly as is practicable, but in any
event by the date (the “Amendment Effectiveness Deadline Date”) that is 

  
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sixty (60) days after the date such post-effective amendment is required by this clause to be filed; 
 (ii) provide such Holder copies of any documents filed pursuant to Section 3(a)(i); and 
 (iii) notify such Holder as promptly as practicable after the effectiveness under the Securities Act of any post-effective amendment filed pursuant to Section 3(a)(i); 

provided, that if the request by such Holder is delivered during a Deferral Period, the Company shall so inform the Holder making
such request and shall take the actions set forth in clauses (i), (ii) and (iii) above upon expiration of the Deferral Period in accordance with this Section 3(a) and Section 3(h) of this Agreement. Notwithstanding
anything contained herein to the contrary, the Amendment Effectiveness Deadline Date shall be extended by five (5) Business Days from the expiration of a Deferral Period if such Deferral Period shall be in effect on the Amendment Effectiveness
Deadline Date; and provided, further, that in no event shall the Company be required to file pursuant to this Section 3(a) in the case where a post-effective amendment is required, more than one post-effective amendment to
the Shelf Registration Statement in any 120-day period. 
 (b) The Company shall notify the Holders of the
Registrable Shares included within the coverage of the Shelf Registration Statement (which notice may, at the discretion of the Company (or as required pursuant to Section 3(h)), state that it constitutes a Deferral Notice, in which
event the provisions of Section 3(h) shall apply): 
 (i) when the Shelf Registration Statement or
any amendment thereto has been filed with the Commission and when the Shelf Registration Statement or any post-effective amendment thereto has become effective; 
 (ii) of any request by the Commission for amendments or supplements to the Shelf Registration Statement or the prospectus included therein or for additional information; 

(iii) of the issuance by the Commission of any stop order suspending the effectiveness of the Shelf Registration Statement
or the initiation of any proceedings for that purpose and of any other action, event or failure to act that would cause the Shelf Registration Statement not to remain effective; 

(iv) of the receipt by the Company of any notification with respect to the suspension of the qualification or exemption
from qualification of any Registrable Shares for sale in any jurisdiction or the initiation of any proceeding for such purpose; and 
 (v) of the occurrence of any Material Event (as defined in Section 3(h)). 

  
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 Any notice delivered in connection with any of the events described in Sections
3(b)(i) through (iv) shall include copies of any written correspondence or other documents received by the Company from the Commission or any other regulatory body (including any exchange upon which the Registrable Securities are
then traded) relating thereto. 
 (c) The Company shall use its reasonable best efforts to obtain the withdrawal
at the earliest possible time of any stop order suspending the effectiveness of the Shelf Registration Statement and the elimination of any other impediment to the continued effectiveness of the Shelf Registration Statement. 

(d) The Company shall promptly furnish to each Holder of Registrable Shares included within the coverage of the Shelf
Registration Statement, without charge, if the Holder so requests in writing, at least one (1) conformed copy of the Shelf Registration Statement and any post-effective amendment thereto, including financial statements and schedules and all
exhibits thereto (including those, if any, incorporated by reference). 
 (e) The Company shall promptly deliver
to each Holder of Registrable Shares included within the coverage of the Shelf Registration Statement, without charge, ten (10) copies of the prospectus (including each preliminary prospectus) included in the Shelf Registration Statement and
any amendment thereof or supplement thereto and any Free Writing Prospectus used in connection therewith as such Holder may reasonably request. The Company consents, subject to the provisions of this Agreement and except during such periods that a
Deferral Notice is outstanding and has not been revoked, to the use of the prospectus and each amendment or supplement thereto used in connection therewith by each of the selling Holders in connection with the offering and sale of the Registrable
Shares covered by the prospectus, or any amendment or supplement thereto, included in the Shelf Registration Statement. 
 (f) The Company shall use reasonable efforts to register or qualify, or cooperate with the Holders of the Registrable Shares included in the Shelf Registration Statement and their respective counsel in
connection with the registration or qualification of, the resale of the Registrable Shares under the securities or “blue sky” laws of such states of the United States as any Holder requests in writing and to do any and all other acts or
things necessary or advisable to enable the offer and sale in such jurisdictions of the Registrable Shares covered by the Shelf Registration Statement; provided, however, that the Company shall not be required to (i) qualify generally to
do business in any jurisdiction where it is not then so qualified or (ii) take any action that would subject it to general service of process or to taxation in any jurisdiction to which it is not then so subject. 

(g) The Company shall, at its sole expense, upon notice from any Holder of Registrable Shares timely prepare and deliver
certificates representing the Registrable Shares to be delivered to a transferee pursuant to the Shelf Registration Statement, which certificates shall be free of any restrictive legends and in such denominations and registered in such names as the
Holders may request. 

  
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 (h) Upon (i) the issuance by the Commission of a stop order suspending
the effectiveness of the Shelf Registration Statement or the initiation of proceedings with respect to the Shelf Registration Statement under Section 7(d) or 7(e) of the Securities Act, (ii) the occurrence of any event or the existence of
any fact (a “Material Event”) as a result of which (x) the Shelf Registration Statement shall contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make
the statements therein not misleading or (y) any prospectus included in the Shelf Registration Statement shall contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make
the statements therein, in the light of the circumstances under which they were made, not misleading, (iii) the occurrence or existence of any pending corporate development that, in the reasonable judgment of the Company, makes it necessary to
suspend the availability of the Shelf Registration Statement and the related prospectus for a period of time, or (iv) the Company’s having filed a document pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act that, in the
reasonable judgment of the Company, must be included in the Shelf Registration Statement pursuant to a post-effective amendment to the Shelf Registration Statement or supplement to the related prospectus (any such document, an “Exchange Act
Report”): 
 (A) in the case of clause (ii) above, subject to clause (C) below, as promptly as
practicable, the Company shall prepare and file, if necessary pursuant to applicable law, a post-effective amendment to the Shelf Registration Statement or a supplement to the related prospectus or any document incorporated therein by reference or
file any other required document that would be incorporated by reference into the Shelf Registration Statement and related prospectus so that (1) the Shelf Registration Statement does not contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary to make the statements therein not misleading and (2) such prospectus does not contain any untrue statement of a material fact or omit to state any 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, as thereafter delivered to the purchasers of the Registrable Shares being sold thereunder, and, in the case of a
post-effective amendment to the Shelf Registration Statement, subject to the next sentence, use reasonable efforts to cause it to be declared effective as promptly as is practicable; 

(B) in the case of clause (iv) above, subject to clause (C) below, as promptly as practicable, but in no event
more than five (5) Business Days, following the Company’s filing of an Exchange Act Report, the Company shall prepare and file, if necessary, pursuant to applicable law, a post-effective amendment to the Shelf Registration Statement or a
supplement to the related prospectus incorporating by reference the Exchange Act Report into the Shelf Registration Statement or including within such post-effective amendment or supplement the information contained in the related Exchange Act
Report; and 

  
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 (C) the Company shall give notice to the Holders with respect to the Shelf
Registration Statement, that the availability of the Shelf Registration Statement is suspended (a “Deferral Notice”) and, upon receipt of any Deferral Notice, each Holder agrees not to sell any Registrable Shares pursuant to the
Shelf Registration Statement until such Holder’s receipt of copies of the supplemented or amended prospectus provided for in clause (A) or (B) above, or until it is advised in writing by the Company that the prospectus may be used,
and has received copies of any additional or supplemental filings that are incorporated or deemed incorporated by reference in such prospectus. 
 The Company will use its reasonable best efforts to ensure that the use of the prospectus with respect to the Shelf Registration Statement may be resumed (w) in the case of clause (i) above, as
promptly as is practicable, (x) in the case of clause (ii) above, as soon as, in the reasonable judgment of the Company, public disclosure of such Material Event would not be prejudicial to or contrary to the material interests of the
Company, (y) in the case of clause (iii) above, as soon as, in the reasonable judgment of the Company, such suspension is no longer necessary; provided, that in no event shall (A) the aggregate duration of all suspensions
arising from events described in clauses (ii) and (iii) above exceed 60 days in any 12-month period or (B) a suspension arising from an event described in clause (ii) or clause (iii) above be invoked more than twice in any
12-month period, and (z) in the case of clause (iv) above, as soon as practicable following the filing of the Exchange Act Report, but in no event sooner than the Commission has declared the post-effective amendment, if applicable,
effective. Any such period during which the availability of the Shelf Registration Statement and any related prospectus is suspended is referred to as the “Deferral Period.” 

(i) The Company will comply with all rules and regulations of the Commission to the extent and so long as they are
applicable to the Shelf Registration and will make generally available to its security holders (or otherwise provide in accordance with Section 11(a) of the Securities Act) an earnings statement (which need not be audited) satisfying the
provisions of Section 11(a) of the Securities Act and Rule 158 thereunder, no later than 45 days after the end of a 12-month period (or 90 days, if such period is a fiscal year) beginning with the first month of the Company’s first fiscal
quarter commencing after the effective date of the Shelf Registration Statement, which statement shall cover such 12-month period. 
 (j) If requested in writing in connection with a disposition of Registrable Shares pursuant to the Shelf Registration Statement, the Company shall make reasonably available for inspection during normal
business hours by a representative for the Holders of a majority of the number of such Registrable Shares, any broker-dealers, attorneys and accountants retained by such holders, and any attorneys or other agents retained by a broker-dealer engaged
by such Holders, all relevant financial and other records and pertinent corporate documents and properties of the Company and its subsidiaries, and cause the appropriate officers, directors and employees of the Company and its subsidiaries to make
reasonably available for inspection during normal business hours on reasonable notice all relevant information reasonably requested by such representative for 

  
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the Holders, or any such broker-dealers, attorneys or accountants in connection with such disposition, in each case as is customary for similar “due diligence” examinations;
provided, that such persons shall first agree in writing with the Company that any information that is reasonably and in good faith designated by the Company in writing as confidential at the time of delivery of such information shall be kept
confidential by such persons and shall be used solely for the purposes of exercising rights under this Agreement, unless (i) disclosure of such information is required by court or administrative order or is necessary to respond to inquiries of
regulatory authorities, (ii) disclosure of such information is required by law (including any disclosure requirements pursuant to federal securities laws in connection with the filing of the Shelf Registration Statement or the use of any
prospectus or Free Writing Prospectus referred to in this Agreement) or (iii) such information becomes generally available to the public other than as a result of a disclosure or failure to safeguard by any such person, and provided further
that the foregoing inspection and information gathering shall, to the greatest extent possible, be coordinated on behalf of all the Holders and the other parties entitled thereto by one legal counsel (“Holders Counsel”) designated
by the Holders of a majority of the number of Registrable Shares with respect to such Shelf Registration Statement. 
 (k) The Company shall (i) permit such Holders Counsel to review and comment upon (A) the Shelf Registration Statement at least five (5) Business Days prior to its filing with the Commission
and (B) all Free Writing Prospectuses and all amendments and supplements to the Shelf Registration Statement within a reasonable number of days, but in any event not less than two (2) Business Days, prior to their filing with the
Commission, and (ii) not file the Shelf Registration Statement or amendment thereof or supplement thereto or any Free Writing Prospectus in a form to which such Holders Counsel reasonably objects. The Company shall furnish to such Holders
Counsel, without charge, (x) copies of any correspondence from the Commission or the staff of the Commission to the Company or its representatives relating to the Shelf Registration Statement or any document incorporated by reference therein,
(y) promptly after the same is prepared and filed with the Commission, one copy of the Shelf Registration Statement and any amendment(s) thereto, including financial statements and schedules, all documents incorporated therein by reference, if
requested by a Holder, and all exhibits thereto; and (z) promptly upon the effectiveness of the Shelf Registration Statement, one copy of the prospectus included in the Shelf Registration Statement and all amendments and supplements thereto.
The Company shall reasonably cooperate with such Holders Counsel in performing the Company’s obligations pursuant to this Section 3. 
 (l) If reasonably requested by a Holder, the Company shall as soon as practicable (i) incorporate in a prospectus supplement or post-effective amendment such information as such Holder reasonably
requests to be included therein relating to the sale and distribution of Registrable Shares, including, without limitation, information with respect to the number of Registrable Shares being offered or sold, the purchase price being paid therefor
and any other terms of the offering of the Registrable Shares to be sold in such offering; (ii) make all required filings of such prospectus supplement or post-effective amendment after being notified of the matters to be incorporated in such


  
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prospectus supplement or post-effective amendment; and (iii) supplement or make amendments to any Shelf Registration Statement if reasonably requested by a Holder holding any Registrable
Shares. 
 4. Holder’s Obligations. Each Holder agrees promptly upon written request by the Company to furnish to
the Company all information required to be disclosed under Item 507 of Regulation S-K under the Securities Act and any other material information regarding such Holder and the distribution of such Registrable Shares as the Company may from time
to time reasonably request. 
 5. Registration Expenses. 

(a) All fees and expenses incident to the Company’s performance of and compliance with this Agreement will be borne
by the Company, regardless of whether the Shelf Registration Statement is ever filed or becomes effective, including without limitation: 
 (i) all registration and filing fees and expenses; 
 (ii) all fees
and expenses of compliance with federal securities and state “blue sky” or securities laws; 
 (iii)
all expenses of printing (including, without limitation, printing certificates and prospectuses), messenger and delivery services and telephone; 
 (iv) all fees and disbursements of counsel for the Company; 
 (v)
all application and filing fees in connection with listing on a national securities exchange or automated quotation system pursuant to the requirements hereof; and 

(vi) all fees and disbursements of independent certified public accountants of the Company (including, without limitation,
the expenses of any special audit required by or incident to such performance). 
 The Company will bear its internal expenses
(including, without limitation, all salaries and expenses of its officers and employees performing legal or accounting duties), the expenses of any annual audit and the fees and expenses of any person, including special experts, retained by the
Company. 
 (b) In connection with the filing of the Shelf Registration Statement, the Company will reimburse the
Holders of Registrable Shares who are reselling Registrable Shares pursuant to the “Plan of Distribution” contained in the Shelf Registration Statement for the reasonable fees and disbursements of not more than one (1) counsel, which
shall be chosen by the Holders of a majority in number of shares of the Registrable Shares for whose benefit the Shelf Registration Statement is being prepared, such amount not to exceed $25,000. 

  
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 6. Indemnification. 

(a) The Company agrees to indemnify and hold harmless each Holder of the Registrable Shares included within the coverage
of the Shelf Registration Statement, the directors, officers, employees, Affiliates and agents of each such Holder and each person who controls any such Holder within the meaning of the Securities Act or the Exchange Act (collectively, the
“Holder Indemnified Parties”) from and against any losses, claims, damages or liabilities, joint or several, or any actions in respect thereof to which each Holder Indemnified Party may become subject under the Securities Act or the
Exchange Act, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon (i) any untrue statement or alleged untrue statement of a material fact contained in the Shelf Registration Statement or in any
amendment thereof, in each case at the time such became effective under the Securities Act, or in any Disclosure Package, prospectus or in any amendment thereof or supplement thereto, or (ii) the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements therein (in the case of the Disclosure Package or any prospectus, in the light of the circumstances under which they were made) not misleading, and shall reimburse, as
incurred, the Holder Indemnified Parties for any legal or other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, damage, liability or action in respect thereof; provided, however,
that the Company shall not be liable in any such case to the extent that such loss, claim, damage or liability arises out of or is based upon any untrue statement or omission made in the Shelf Registration Statement, the Disclosure Package, any
prospectus or in any amendment thereof or supplement thereto in reliance upon and in conformity with written information pertaining to such Holder and furnished to the Company by or on behalf of such Holder Indemnified Party specifically for
inclusion therein; provided further, however, that the Company shall not be liable in any such case to the extent that such loss, claim, damage or liability arises out of or is based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in the Disclosure Package, where (i) such statement or omission had been eliminated or remedied in any subsequently filed amended prospectus, prospectus supplement or Free Writing Prospectus (the Disclosure
Package, together with such updated documents, the “Updated Disclosure Package”), the filing of which the applicable Holder had been notified in accordance with the terms of this Agreement, (ii) such Updated Disclosure Package
was available at the time the Holder sold Registrable Shares under the Shelf Registration Statement, (iii) such Updated Disclosure Package was not furnished by the Holder to the person or entity asserting the loss, liability, claim, damage or
liability at or prior to the time such furnishing is required by the Securities Act and (iv) the Updated Disclosure Package would have cured the defect giving rise to such loss, liability, claim, damage or action; and provided further,
however, that this indemnity agreement will be in addition to any liability that the Company may otherwise have to such Holder Indemnified Party. Such indemnity shall remain in full force and effect regardless of any investigation made by or
on behalf of any Holder Indemnified Parties and shall survive the transfer of the Registrable Shares by any Holder. 

  
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 (b) Each Holder of the Registrable Shares covered by the Shelf Registration
Statement severally, and not jointly, agrees to indemnify and hold harmless the Company, each of its directors, each of its officers who signs the Shelf Registration Statement, as well as any officers, employees, Affiliates and agents of the
Company, and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act (a “Company Indemnified Party”) from and against any losses, claims, damages or liabilities or any actions in
respect thereof, to which a Company Indemnified Party may become subject under the Securities Act or the Exchange Act, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon (i) any untrue statement or
alleged untrue statement of a material fact contained in the Shelf Registration Statement or in any amendment thereof, in each case at the time such became effective under the Securities Act, or in any Disclosure Package, prospectus or in any
amendment thereof or supplement thereto, or (ii) the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in the case of the Disclosure Package or any
prospectus, in the light of the circumstances under which they were made) not misleading, but in each case only to the extent that the untrue statement or omission or alleged untrue statement or omission was made in reliance upon and in conformity
with written information pertaining to such Holder and furnished to the Company by or on behalf of such Holder specifically for inclusion therein; and, subject to the limitation set forth immediately preceding this clause, shall reimburse, as
incurred, the Company Indemnified Parties for any legal or other expenses reasonably incurred by them in connection with investigating or defending any loss, claim, damage, liability or action in respect thereof. This indemnity agreement will be in
addition to any liability that such Holder may otherwise have to the Company Indemnified Parties. Notwithstanding any other provision of this Section 6(b), no Holder shall be required to indemnify or hold harmless any Company Indemnified
Party in an amount in excess of the amount by which the net proceeds received by such Holder from the sale of the Registrable Shares pursuant to the Shelf Registration Statement exceeds the amount of damages that such Holder has otherwise been
required to pay by reason of such untrue statement or omission. 
 (c) Promptly after receipt by a Holder
Indemnified Party or a Company Indemnified Party (each, an “Indemnified Party”) of notice of the commencement of any action or proceeding (including a governmental investigation), such Indemnified Party will, if a claim in respect
thereof is to be made against the indemnifying party under this Section 6, notify the indemnifying party of the commencement thereof; but the omission to so notify the indemnifying party will not relieve the indemnifying party from
liability under paragraph (a) or (b) above unless and to the extent it did not otherwise learn of such action and the indemnifying party has been materially prejudiced by such failure. In case any such action is brought against any
Indemnified Party, and it notifies the indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein and, to the extent that it may wish, jointly with any other indemnifying party similarly notified,
to assume the defense thereof, with counsel reasonably satisfactory to such Indemnified Party (who shall not, except with the consent of the Indemnified Party, be counsel to the indemnifying party), and after notice from the indemnifying party to
such Indemnified Party of its election so to assume the defense 

  
 12 

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thereof the indemnifying party will not be liable to such Indemnified Party under this Section 6 for any legal or other expenses, other than reasonable costs of investigation,
subsequently incurred by such Indemnified Party in connection with the defense thereof; provided, however, if such Indemnified Party shall have been advised by counsel that there are one or more defenses available to it that are in
conflict with those available to the indemnifying party (in which case the indemnifying party shall not have the right to direct the defense of such action on behalf of the Indemnified Party), the reasonable fees and expenses of such Indemnified
Party’s counsel shall be borne by the indemnifying party. In no event shall the indemnifying party be liable for the fees and expenses of more than one counsel (together with appropriate local counsel) at any time for any Indemnified Party in
connection with any one action or separate but substantially similar or related actions arising in the same jurisdiction out of the same general allegations or circumstances. No indemnifying party shall, without the prior written consent of the
Indemnified Party (not to be unreasonably withheld or delayed), effect any settlement of any pending or threatened action in respect of which any Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such
Indemnified Party unless such settlement (i) includes an unconditional release of such Indemnified Party from all liability on any claims that are the subject matter of such action and (ii) does not include a statement as to or an
admission of fault, culpability or a failure to act by or on behalf of any Indemnified Party. 
 (d) If the
indemnification provided for in this Section 6 is unavailable or insufficient to hold harmless an Indemnified Party under subsections (a) or (b) above, then each indemnifying party shall contribute to the amount paid or payable
by such Indemnified Party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to in subsection (a) or (b) above in such proportion as is appropriate to reflect the relative fault of the
indemnifying party or parties on the one hand and the Indemnified Party on the other in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities (or actions in respect thereof) as well as any other
relevant equitable considerations. The relative fault of the parties shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material
fact relates to information supplied by the Company on the one hand or the Holder or Holder Indemnified Party, as the case may be, on the other, and the parties’ relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The amount paid by an Indemnified Party as a result of the losses, claims, damages or liabilities referred to in the first sentence of this subsection (d) shall be deemed to include any legal or other
expenses reasonably incurred by such Indemnified Party in connection with investigating or defending any action or claim that is the subject of this subsection (d). The parties agree that it would not be just and equitable if contributions were
determined by pro rata allocation (even if the Holders were treated as one entity for such purpose) or any other method of allocation that does not take account of the equitable considerations referred to above. Notwithstanding any other
provision of this Section 6(d), no Holder shall be required to contribute any amount in excess of the amount by which the net proceeds received by such Holder from the sale of the Registrable Shares pursuant to the Shelf Registration
Statement exceeds the 

  
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amount of damages that such Holder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. 

(e) The agreements contained in this Section 6 shall survive the sale of the Registrable Shares pursuant to
the Shelf Registration Statement and shall remain in full force and effect, regardless of any termination or cancellation of this Agreement or any investigation made by or on behalf of any Indemnified Party. 

7. Information Requirements. The Company covenants that, if at any time before the end of the applicable Shelf Registration
Period, the Company is not subject to the reporting requirements of the Exchange Act, it will take such further action as may be required from time to time to enable the Holders to sell Registrable Shares without registration under the Securities
Act within the limitation of the exemptions provided by Rules 144 and 144A (including the requirements of Rule 144A(d)(4)) under the Securities Act. Upon the request of any Holder of Registrable Shares, the Company shall deliver to such Holder a
written statement as to whether it has complied with such requirements. 
 8. Miscellaneous. 

(a) Recapitalizations, Exchanges, Etc. The provisions of this Agreement shall apply to the full extent set forth
herein with respect to (i) the Registrable Shares, (ii) any and all securities of the Company into which the Registrable Shares are converted, exchanged or substituted in any recapitalization or other capital reorganization by the Company
and (iii) any and all equity securities of the Company or any successor or assign of the Company (whether by merger, consolidation, sale of assets or otherwise) which may be issued in respect of, in conversion of, in exchange for or in
substitution of, the shares of Registrable Shares and shall be appropriately adjusted for any stock dividends, splits, reverse splits, combinations, recapitalizations and the like occurring after the date hereof. The Company shall cause any
successor or assign (whether by merger, consolidation, sale of assets or otherwise) to assume this Agreement or enter into a new registration rights agreement with the Holders on terms substantially the same as this Agreement as a condition of any
such transaction. 
 (b) No Inconsistent Agreements. The Company will not on or after the date of this
Agreement enter into any agreement with respect to its securities that is inconsistent with the rights granted to the Holders in this Agreement or otherwise conflicts with the provisions hereof. The rights granted to the Holders hereunder do not in
any way conflict with and are not inconsistent with the rights granted to the holders of the Company’s securities under any agreement in effect on the date hereof. 

(c) Interpretation. Article, Section and Annex references are to this Agreement, unless otherwise specified. All
references to instruments, documents, contracts, and agreements are references to such instruments, documents, contracts and agreements as the same may be amended, supplemented and otherwise modified from


  
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time to time, unless otherwise specified. The word “including” shall mean “including, without limitation.” 

(d) Amendments and Waivers. The provisions of this Agreement may not be amended, modified or supplemented, and
waivers or consents to departures from the provisions hereof may not be given, except by the written consent of the Company and the Holders of a majority in number of then outstanding Registrable Shares; provided, however, that,
notwithstanding the foregoing, any amendment or modification of or supplement to this Agreement which would materially and adversely affect any Investor in a manner that is disproportionate to the other Investors will be binding upon and enforceable
against such Investor only with its prior written consent. Notwithstanding the foregoing, a waiver or consent to depart from the provisions hereof with respect to a matter that relates exclusively to the rights of Holders whose securities are being
sold pursuant to the Shelf Registration Statement and that does not directly or indirectly affect the rights of other Holders may be given by Holders of at least a majority of the Registrable Shares being sold by such Holders pursuant to the Shelf
Registration Statement; provided, that the provisions of this sentence may not be amended, modified, or supplemented except in accordance with the provisions of the immediately preceding sentence. Each Holder of Registrable Shares outstanding
at the time of any such amendment, modification, supplement, waiver or consent or thereafter shall be bound by any such amendment, modification, supplement, waiver or consent effected pursuant to this Section 8(d), whether or not any
notice, writing or marking indicating such amendment, modification, supplement, waiver or consent appears on the Registrable Shares. Any amendment, supplement or modification of or to any provision of this Agreement, any waiver of any provision of
this Agreement, and any consent to any departure from the terms of any provision of this Agreement shall be effective only in the specific instance and for the specific purpose for which made or given. No failure or delay on the part of any party in
exercising any right, power or remedy hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such right, power or remedy preclude any other or further exercise thereof or the exercise of any right, power or
remedy. The remedies provided for herein are cumulative and are not exclusive of any remedies that may be available to a party at law or in equity or otherwise. A copy of each amendment, modification or supplement to this Agreement shall be
delivered by the Company to each Holder. No amendment, modification or supplement to this Agreement shall be binding on any Holder until such Holder shall have received written notice of the adoption thereof in accordance with this
Section 8(d). 
 (e) Notices. All notices and other communications provided for or permitted
hereunder shall be made in writing and shall be given by registered or certified mail, return receipt requested, telecopy, air courier guaranteeing overnight delivery or personal delivery to the following addresses: 

(i) if to the Company, at its address as follows: 

Puma Biotechnology, Inc. 
 10940 Wilshire Blvd, Suite 600 

  
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has been requested with respect to the omitted portions. 








 
Los Angeles, CA 90024 
 Attn: Alan H. Auerbach 

Telephone: (310) 443-4150 
 Facsimile: (310) 443-4158 
 With a copy to: 

Latham & Watkins LLP 
 650 Town Center Drive, 20th Floor 
 Costa Mesa, CA 92626 

Attention: Shayne Kennedy, Esq. 
 Telephone: (714) 755-8181 
 Facsimile: (714) 755-8290 

(ii) if to a Holder, at the most current address shown for such Holder in the records of the Company; 

or to such other address as the Company or such Holder may designate in writing. All notices and communications shall be deemed to have
been duly given: at the time delivered by hand, if personally delivered; upon actual receipt if sent by certified mail, return receipt requested, or regular mail, if mailed; when receipt acknowledged, if sent via facsimile; and upon actual receipt
when delivered to an air courier guaranteeing overnight delivery. 
 (f) Successors and Assigns. This
Agreement shall inure to the benefit of and be binding upon the successors and permitted assigns of the parties hereto as hereinafter provided. The rights of the Holders contained in this Agreement shall be automatically transferred to the
transferee of any Registrable Shares, provided, that (i) such transfer consists of the lesser of (A) at least 100,000 Registrable Shares or (B) 100% of the Registrable Shares purchased by such Holder pursuant to the Purchase
Agreement; (ii) such transferee agrees to become a party to this Agreement and be fully bound by, and subject to, all of the terms and conditions of this Agreement as though an original party hereto; (iii) the Company is, within a
reasonable time after such transfer, furnished with written notice of (a) the name and address of such transferee, and (b) the securities with respect to which such registration rights are being transferred; (iv) immediately following
such transfer the further disposition of such securities by the transferee is restricted under the Securities Act or applicable state securities laws if so required; and (v) such transfer shall have been conducted in accordance with all
applicable federal and state securities laws. All of the obligations of the Company hereunder shall survive any such transfer. 
 Neither this Agreement nor any of the rights or duties of the Company set forth herein shall be assigned by the Company, in whole or in part, without having first received the written consent of the
Holders of a majority of the then outstanding Registrable Securities. Notwithstanding the foregoing, upon the consummation of the Merger and with respect to all times following the consummation of the Merger, (i) the


  
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Company shall, and hereby does, irrevocably assign all of its rights, duties and obligations under this Agreement to IAC and (ii) IAC, by executing this Agreement as an anticipated successor
and assign to the Company, does hereby irrevocably assume, effective upon the consummation of the Merger, all of the Company’s rights, duties and obligations under this Agreement, including the Company’s obligation to register the
Registrable Shares (the “IAC Assignment”). All parties to this Agreement hereby consent to the assignment and assumption contemplated between the Company and IAC set forth in this paragraph. Further to and not in derogation of the
foregoing, following the consummation of the Merger, those shares of the common stock, par value $0.0001 per share, of IAC (“IAC Stock”) (i) issued to the Investors in connection with the Merger and (ii) which shall
underlie the Warrants and be issuable upon exercise of the Warrants, shall constitute Registrable Shares for all purposes hereunder. For the avoidance of doubt and by way of example, the Company, the Investors and IAC acknowledge and agree that, as
a result of the IAC Assignment, (y) the obligation to file and keep effective the Shelf Registration Statement shall be assumed and undertaken by IAC, and (z) the covenants regarding registration rights and indemnification of the Investors
set forth herein shall be binding on IAC. 
 (g) Counterparts. This Agreement may be executed in any
number of counterparts and by different parties hereto in separate counterparts, each of which counterpart, when so executed and delivered, shall be deemed to be an original and all of which counterparts, taken together, shall constitute one and the
same agreement. 
 (h) Headings. The headings in this Agreement are for convenience of reference only and
shall not limit or otherwise affect the meaning hereof. 
 (i) Governing Law. This Agreement shall be
governed by, and construed in accordance with, the laws of the State of New York without regard to principles of conflicts of laws. 
 (j) Submission to Jurisdiction. The parties to this Agreement (i) irrevocably submit to the exclusive jurisdiction of any state or federal courts located in New York County, New York in
connection with any disputes arising out of or relating to this Agreement and (ii) waive any claim of improper venue or any claim that those courts are an inconvenient forum. The parties to this Agreement agree that mailing of process or other
papers in connection with any such action or proceeding in the manner provided in Section 8(e) or in such other manner as may be permitted by applicable laws, shall be valid and sufficient service thereof. 

(k) Severability. If any term or other provision of this Agreement is invalid, illegal or incapable of being
enforced by virtue of any applicable law, or due to any public policy, all other conditions and provisions of this Agreement shall nevertheless remain in full force and effect so long as the economic or legal substance of the transactions
contemplated hereby is not affected in any manner materially adverse to any party. Upon such determination that any term or other provision is invalid, illegal or incapable of being enforced, the parties hereto shall negotiate in good faith to
modify this Agreement so as to effect the original intent of the parties as closely as possible in an 

  
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acceptable manner so that the transactions contemplated hereby are fulfilled to the extent possible. 
 (l) Entire Agreement. This Agreement is intended by the parties as a final expression of their agreement and is intended to be a complete and exclusive statement of the agreement and understanding
of the parties hereto in respect of the subject matter contained herein, superseding all prior agreements and understandings among the parties with respect to such subject matter. 

(m) Further Assurances. Each of the parties shall execute such documents and perform such further acts as may be
reasonably required or desirable to carry out or to perform the provisions of this Agreement. 
 (n)
Termination. This Agreement and the obligations of the parties hereunder shall terminate upon the end of the Shelf Registration Period, except that the obligations arising under Sections 5, 6 and 8 shall remain in effect
in accordance with their terms. 
 (o) Securities Held by the Company. Whenever the consent or approval of
Holders of a specified number of Registrable Shares is required hereunder, shares of Common Stock held by the Company or its subsidiaries shall not be counted in determining whether such consent or approval was given by the Holders of such required
percentage. 
 (p) Independent Nature of Obligations. The obligations of each Investor under this
Agreement are several and not joint with the obligations of any other Investor, and no Investor shall be responsible in any way for the performance of the obligations of any other Investor under this Agreement. The failure or waiver of performance
under this Agreement by any Investor shall not excuse performance by any other Investor. Each Investor shall be entitled to independently protect and enforce its rights, including, without limitation, the rights arising out of this Agreement, and it
shall not be necessary for any other Investor to be joined as an additional party in any proceeding for such purpose. 
 (q) Definitions. The following terms shall have the following meanings: 
 “Affiliate” means, with respect to any specified person, an “affiliate,” as defined in Rule 144(a)(1) of the Securities Act, of such person. 

“Agreement” shall have the meaning set forth in the recitals hereto. 

“Amendment Effectiveness Deadline Date” shall have the meaning set forth in Section 3(a)(i).

 “Blackout Period” shall have the meaning set forth in Section 1(d). 

“Business Day” shall mean any day other than a Saturday, Sunday or other day on which banks in the State
of New York are required or authorized to close. 

  
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 “Commission” shall have the meaning set forth in
Section 1(a). 
 “Common Stock” shall have the meaning set forth in the recitals
hereto. 
 “Company” shall have the meaning set forth in the recitals hereto. 

“Company Indemnified Party” shall have the meaning set forth in Section 6(b). 

“Deferral Notice” shall have the meaning set forth in Section 3(h)(C). 

“Deferral Period” shall have the meaning set forth in Section 3(h). 

“Disclosure Package” means, with respect to any offering of securities, (i) the preliminary
prospectus, (ii) each Free Writing Prospectus and (iii) all other information, in each case, that is deemed, under Rule 159 promulgated under the Securities Act, to have been conveyed to purchasers of securities at the time of sale of such
securities (including, without limitation, a contract of sale). 
 “Effectiveness Deadline”
shall mean the date that is 180 days after the date of this Agreement. 
 “Exchange Act” means
the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder. 

“Exchange Act Report” shall have the meaning set forth in Section 3(h). 

“Filing Deadline” shall mean the date that is 60 days after the date of this Agreement; provided,
however, that such date shall be automatically extended by 30 days if [* * *]. 
 “Founder”
means Alan H. Auerbach. 
 “Free Writing Prospectus” means any “free writing
prospectus” as defined in Rule 405 promulgated under the Securities Act. 
 “Holder” means
a holder of record of Registrable Shares. 
 “Holder Indemnified Party” shall have the meaning
set forth in Section 6(a). 
 “Holders Counsel” shall have the meaning set forth in
Section 3(j). 
 “IAC” shall have the meaning set forth in the recitals hereto.

 “IAC Assignment” shall have the meaning set forth in Section 8(f). 

“IAC Stock” shall have the meaning set forth in Section 8(f). 

  
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 “Indemnified Party” shall have the meaning set forth in
Section 6(c). 
 “Investor” shall have the meaning set forth in the recitals hereto.

 “Material Event” shall have the meaning set forth in Section 3(h). 

“Merger” means that transaction contemplated by the Agreement and Plan of Merger with IAC, and IAC Merger
Corporation, a Delaware corporation and wholly-owned subsidiary of IAC (“Merger Sub”), pursuant to which Merger Sub will merger with and into the Company, with the Company remaining as the surviving corporation. 

“Permissible Deferral Period” shall have the meaning set forth in Section 1(d). 

“Person” means any individual, partnership, joint-stock company, corporation, limited liability company,
trust or unincorporated organization, and a government or agency or political subdivision thereof. 

“Purchase Agreement” shall have the meaning set forth in the recitals hereto. 

“Registrable Shares” means (A) each share of Common Stock acquired by the Holders pursuant to the
Purchase Agreement , (B) each Warrant Share, and (C) any stock of the Company issued as a dividend, or other distribution with respect to or in exchange for, the Common Stock referred to in clause (A) or (B) above; until the date
on which all of the Registrable Shares then owned by such Holder have been effectively registered under the Securities Act and disposed of in accordance with such registration statement or have been disposed of pursuant to Rule 144 under the
Securities Act. 
 “Rule 415 Limitation” shall have the meaning set forth in
Section 1(a). 
 “Securities Act” means the Securities Act of 1933, as amended, and
the rules and regulations promulgated thereunder. 
 “Shelf Registration” shall have the meaning
set forth in Section 1(a). 
 “Shelf Registration Period” shall have the meaning set
forth in Section 1(b). 
 “Shelf Registration Statement” shall have the meaning set
forth in Section 1(a). 
 “Subsequent Financing” means [* * *]. 

“Subsequent Shelf Limitation” shall have the meaning set forth in Section 1(a). 

“Updated Disclosure Package” shall have the meaning set forth in Section 6(a). 

“Warrant” shall have the meaning set forth in the recitals hereto. 

  
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 “Warrant Shares” means the shares of Common Stock (or,
following the consummation of the Merger, the shares of IAC Stock) issued, or issuable, upon exercise of the Warrants as of the date of Shelf Registration Statement is declared effective. 

[The remainder of this page is intentionally left blank.] 

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

			
	THE CORPORATION:
	
	PUMA BIOTECHNOLOGY, INC.
		
	By:	 	/s/ Alan H. Auerbach
	Name:	 	Alan H. Auerbach
	Title:	 	President and Chief Executive Officer



  
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	As an anticipated successor and assign to the Corporation under Section 8 hereof:
	
	INNOVATIVE ACQUISITIONS CORP.
		
	By:	 	/s/ Robert Johnson
	Name:	 	Robert Johnson
	Title:	 	President



  
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	 INVESTOR:
  

ADAGE CAPITAL PARTNERS, L.P.

		
	By:	 	/s/ Phillip T. Gross
		 	Authorized Signatory
		
		 	Phillip T. Gross
		 	Name Printed
		
		 	Managing Director
		 	Title



  
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Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
			
	 INVESTOR:
  

BBT FUND, L.P.
  
     By:  BBT Genpar, L.P., general partner
  
         By:  BBT-FW, Inc., general partner

		
	            By:	 	/s/ William O. Reimann
		 	William O. Reimann
		 	Vice President



  
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	 INVESTOR:
  

BROOKSIDE CAPITAL PARTNERS FUND, L.P.

		
	By:	 	/s/ Ranesh Ramanathan
		 	Authorized Signatory
		
		 	Ranesh Ramanathan
		 	Name Printed
		
		 	 General Counsel

		 	Title



  
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	 INVESTOR:
  

FIDELITY CONTRAFUND: FIDELITY ADVISOR NEW INSIGHTS FUND

		
	By:	 	/s/ Jeffrey Christian
		 	Authorized Signatory
		
		 	Jeffrey Christian
		 	Name Printed
		
		 	Deputy Treasurer
		 	Title



  
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Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
			
	 INVESTOR:
  

FIDELITY SELECT PORTFOLIOS: HEALTH CARE PORTFOLIO

		
	By:	 	/s/ Jeffrey Christian
		 	Authorized Signatory
		
		 	Jeffrey Christian
		 	Name Printed
		
		 	Deputy Treasurer
		 	Title



  
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Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
			
	 INVESTOR:
  

FIDELITY SELECT PORTFOLIOS: BIOTECHNOLOGY PORTFOLIO

		
	By:	 	/s/ Jeffrey Christian
		 	Authorized Signatory
		
		 	Jeffrey Christian
		 	Name Printed
		
		 	Deputy Treasurer
		 	Title



  
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Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
			
	 INVESTOR:
  

FIDELITY ADVISOR SERIES VII: FIDELITY ADVISOR BIOTECHNOLOGY FUND

		
	By:	 	/s/ Jeffrey Christian
		 	Authorized Signatory
		
		 	Jeffrey Christian
		 	Name Printed
		
		 	Deputy Treasurer
		 	Title



  
 [Signature
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Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
			
	 INVESTOR:
  

FIDELITY SELECT PORTFOLIOS: PHARMACEUTICALS PORTFOLIO

		
	By:	 	/s/ Jeffrey Christian
		 	Authorized Signatory
		
		 	Jeffrey Christian
		 	Name Printed
		
		 	Deputy Treasurer
		 	Title



  
 [Signature
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Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
			
	 INVESTOR:
  

FORESITE CAPITAL II-A, LLC
  
     By: Foresite Capital II-A Management, LLC,
     its
Managing Member

		
	        By:	 	/s/ James B. Tananbaum
		 	James B. Tananbaum
		 	Managing Member



  
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	 INVESTOR:
  

H&Q HEALTHCARE INVESTORS *

		
	By:	 	/s/ Laura Woodward
		 	Authorized Signatory
		
		 	Laura Woodward
		 	Name Printed
		
		 	Treasurer
		 	Title


  

	*	The name H&Q Healthcare Investors is the designation of the Trustees for the time being under an Amended & Restated Declaration of Trust dated
April 12, 1987, as amended, and all persons dealing with H&Q Healthcare Investors must look solely to the trust property for the enforcement of any claim against H&Q Healthcare Investors, as neither the Trustees, officers nor
shareholders assume any personal liability for the obligations entered into on behalf of H& Q Healthcare Investors. 

  

			
	 INVESTOR:
  

H&Q LIFE SCIENCES INVESTORS *

		
	By:	 	/s/ Laura Woodward
		 	Authorized Signatory
		
		 	Laura Woodward
		 	Name Printed
		
		 	Treasurer
		 	Title


  

	*	The name H&Q Life Sciences Investors is the designation of the Trustees for the time being under an Amended & Restated Declaration of Trust dated
February 20, 1992, as amended, and all persons dealing with H&Q Life Sciences Investors must look solely to the trust property for the enforcement of any claim against H&Q Life Sciences Investors, as neither the Trustees, officers nor
shareholders assume any personal liability for the obligations entered into on behalf of H&Q Life Sciences Investors. 


  
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	 INVESTOR:
  

JANUS GLOBAL LIFE SCIENCES FUND, A SERIES OF JANUS INVESTMENT FUND

		
	By:	 	/s/ Andrew Acker
		 	Andrew Acker
		 	Executive Vice President



  
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	INVESTOR:
	
	 PRUDENTIAL SECTOR FUNDS, INC. –
 PRUDENTIAL HEALTH SCIENCES FUND D/B/A PRUDENTIAL JENNISON HEALTH SCIENCES FUND (THE “FUND”)

		
	    By:	 	 Jennison Associates LLC (“Jennison”),
 as sub-advisor to the Fund

			
		 	By:	 	/s/ David Chan
		 		 	David Chan
		 		 	 Managing Director of Jennison and
 Portfolio Manager to the Fund




  
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	 INVESTOR:
  

LEERINK SWANN CO-INVESTMENT FUND LLC

		
	By:	 	/s/ Donald Notman
		 	Authorized Signatory
		
		 	Donald Notman
		 	Name Printed
		
		 	Managing Director
		 	Title



  
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	 INVESTOR:
  

ORBIMED PRIVATE INVESTMENTS IV, LP
  

    By:    OrbiMed Capital GP IV LLC,
               its general partner
  

    By:    OrbiMed Advisors LLC,
               its managing member

		
	        By:	 	/s/ Carl L. Gordon
		 	Carl L. Gordon
		 	Member



  
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	 INVESTOR:
  

FOURTH AVENUE CAPITAL PARTNERS LP
  

By: Its general partner, Fourth Avenue Capital Partners GP LLC

		
	By:	 	/s/ Dan Gold
		 	Authorized Signatory
		
		 	Dan Gold
		 	Name Printed
		
		 	Managing Member
		 	Title
		
	By:	 	/s/ Tracy Fu
		 	Authorized Signatory
		
		 	Tracy Fu
		 	Name Printed
		
		 	Managing Member
		 	Title



  
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	BRYAN WHITE
		
	By:	 	/s/ Bryan K. White
		
		 	Bryan K. White
		 	Name Printed



  
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	 INVESTORS:
  

T. ROWE PRICE ASSOCIATES, INC.
 Investment
Adviser, for an on behalf of the advisory clients listed below (Investors):
     T. Rowe Price Health Sciences Fund,
Inc.
     T. Rowe Price Health Sciences Portfolio
     TD Mutual Funds – TD Health Sciences Fund

    Valic Company I – Health Sciences Fund
     John Hancock Variable Insurance Trust – Health         Sciences Trust
     John Hancock Funds II – Health Sciences Fund

		
	By:	 	/s/ Kris H. Jenner
		 	Authorized Signatory
		
		 	Kris H. Jenner
		 	Name Printed
		
		 	Vice President
		 	Title



  
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	 INVESTOR:
  

SALTHILL PARTNERS, L.P.

		
	By:	 	/s/ Steven M. Hoffman
		 	Authorized Signatory
		
		 	Steven M. Hoffman
		 	Name Printed
		
		 	Vice President & Counsel
		 	Title



  
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	 INVESTOR:
  

SALTHILL INVESTORS (BERMUDA), L.P.

		
	By:	 	/s/ Steven M. Hoffman
		 	Authorized Signatory
		
		 	Steven M. Hoffman
		 	Name Printed
		
		 	Vice President & Counsel
		 	Title



  
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	 INVESTOR:
  

HAWKES BAY MASTER INVESTORS (CAYMAN) LP

		
	By:	 	/s/ Steven M. Hoffman
		 	Authorized Signatory
		
		 	Steven M. Hoffman
		 	Name Printed
		
		 	Vice President & Counsel
		 	Title



  
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	INVESTOR:
		
		 	/s/ Frank Zavrl
		 	Frank Zavrl



  
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 Exhibit A 
 Plan of Distribution 
 The selling stockholders, which as used herein
includes donees, pledgees, transferees or other successors-in-interest selling shares of common stock or interests in shares of common stock received after the date of this prospectus from a selling stockholder as a gift, pledge, partnership
distribution or other transfer, may, from time to time, sell, transfer or otherwise dispose of any or all of their shares of common stock or interests in shares of common stock on any stock exchange, market or trading facility on which the shares
are traded or in private transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale, at prices related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated
prices. 
 The selling stockholders may use any one or more of the following methods when disposing of shares or interests
therein: 
  

	 	•	 	 ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers; 



 

	 	•	 	 block trades in which the broker-dealer will attempt to sell the shares as agent, but may position and resell a portion of the block as principal to
facilitate the transaction; 


  

	 	•	 	 purchases by a broker-dealer as principal and resale by the broker-dealer for its account; 



 

	 	•	 	 an exchange distribution in accordance with the rules of the applicable exchange; 



 

	 	•	 	 privately negotiated transactions; 


  

	 	•	 	 short sales; 


  

	 	•	 	 through the writing or settlement of options or other hedging transactions, whether through an options exchange or otherwise;



  

	 	•	 	 broker-dealers may agree with the selling stockholders to sell a specified number of such shares at a stipulated price per share;



  

	 	•	 	 a combination of any such methods of sale; and 


  

	 	•	 	 any other method permitted pursuant to applicable law. 


 The selling stockholders may, from time to time, pledge or grant a security interest in some or all of the shares of common stock owned by them and, if they default in the performance of their secured
obligations, the pledgees or secured parties may offer and sell the shares of common stock, from time to time, under this prospectus, or under an amendment to this prospectus under Rule 424(b)(3) or other applicable provision of the Securities Act
amending the list of selling stockholders to include the pledgee, transferee or other successors in interest as selling stockholders under this prospectus. The selling stockholders also may transfer the shares


  
 [***] Certain information
in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
of common stock in other circumstances, in which case the transferees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus. 

In connection with the sale of our common stock or interests therein, the selling stockholders may enter into hedging transactions with
broker-dealers or other financial institutions, which may in turn engage in short sales of the common stock in the course of hedging the positions they assume. The selling stockholders may also sell shares of our common stock short and deliver these
securities to close out their short positions, or loan or pledge the common stock to broker-dealers that in turn may sell these securities. The selling stockholders may also enter into option or other transactions with broker-dealers or other
financial institutions or the creation of one or more derivative securities which require the delivery to such broker-dealer or other financial institution of shares offered by this prospectus, which shares such broker-dealer or other financial
institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction). 
 The aggregate
proceeds to the selling stockholders from the sale of the common stock offered by them will be the purchase price of the common stock less discounts or commissions, if any. Each of the selling stockholders reserves the right to accept and, together
with their agents from time to time, to reject, in whole or in part, any proposed purchase of common stock to be made directly or through agents. We will not receive any of the proceeds from this offering. 

The selling stockholders and any underwriters, broker-dealers or agents that participate in the sale of the common stock or interests
therein may be “underwriters” within the meaning of Section 2(11) of the Securities Act. Any discounts, commissions, concessions or profit they earn on any resale of the shares may be underwriting discounts and commissions under the
Securities Act. Selling stockholders who are “underwriters” within the meaning of Section 2(11) of the Securities Act will be subject to the prospectus delivery requirements of the Securities Act. 

To the extent required, the shares of our common stock to be sold, the names of the selling stockholders, the respective purchase prices
and public offering prices, the names of any agents, dealer or underwriter, any applicable commissions or discounts with respect to a particular offer will be set forth in an accompanying prospectus supplement or, if appropriate, a post-effective
amendment to the registration statement that includes this prospectus. 
 In order to comply with the securities laws of some
states, if applicable, the common stock may be sold in these jurisdictions only through registered or licensed brokers or dealers. In addition, in some states the common stock may not be sold unless it has been registered or qualified for sale or an
exemption from registration or qualification requirements is available and is complied with. 
 We have advised the selling
stockholders that the anti-manipulation rules of Regulation M under the Exchange Act may apply to sales of shares in the market and to the activities of the selling stockholders and their affiliates. In addition, we will make copies of this
prospectus (as it may be supplemented or amended from time to time) available to the selling stockholders for the purpose of satisfying the prospectus delivery requirements of the Securities Act. The selling


  
 [***] Certain information
in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 








 
stockholders may indemnify any broker-dealer that participates in transactions involving the sale of the shares against certain liabilities, including liabilities arising under the Securities
Act. 
 We have agreed to indemnify the selling stockholders against liabilities, including liabilities under the Securities Act
and state securities laws, relating to the registration of the shares offered by this prospectus. 
 We have agreed with the
selling stockholders to keep the registration statement of which this prospectus constitutes a part effective until the earlier of the second anniversary of the date the registration statement is declared effective by the SEC and such time as all of
the shares covered by this prospectus have been disposed of pursuant to and in accordance with the registration statement or Rule 144 of the Securities Act. 

  
 [***] Certain information
in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions.