EX-10.4



 EXHIBIT 10.4 

THIS NOTE MAY BE ISSUED WITH ORIGINAL ISSUE DISCOUNT (“OID”) FOR U.S. FEDERAL INCOME TAX PURPOSES. THE AMOUNT OF OID SHALL BE MUTUALLY DETERMINED BY
THE ORIGINAL HOLDER AND THE COMPANY IN GOOD FAITH AND IN ACCORDANCE WITH THE APPLICABLE PROVISIONS OF SECTIONS 1271 THROUGH 1275 OF THE U.S. INTERNAL REVENUE CODE. 

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE
SECURITIES MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES UNDER SAID ACT, OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER SAID ACT INCLUDING, WITHOUT LIMITATION, PURSUANT TO
RULES 144 OR 144A UNDER SAID ACT OR PURSUANT TO A PRIVATE SALE EFFECTED UNDER APPLICABLE FORMAL OR INFORMAL SEC INTERPRETATION OR GUIDANCE, SUCH AS A SO-CALLED “4(1) AND A HALF” SALE. 

SENIOR SECURED CONVERTIBLE NOTE 
  

			
	Issuance Date: June 2, 2014	 	Principal: U.S. $10,000,000

 FOR VALUE RECEIVED, KEMPHARM, INC., a Delaware corporation (the “Company”), hereby
promises to pay to Deerfield Private Design Fund III, L.P. or its registered assigns (the “Holder”), the principal amount of Ten Million Dollars ($10,000,000) pursuant to, and in accordance with, the terms of that certain Facility
Agreement, dated as of June 2, 2014, by and among the Company and the Lenders party thereto (together with all exhibits and schedules thereto and as may be amended, restated, modified and supplemented from time to time, the “Facility
Agreement”). The Company hereby promises to pay accrued and unpaid Interest (as defined below) and premium, if any, on the Principal on the dates, at the rates and in the manner provided for in the Facility Agreement. All capitalized terms
used and not otherwise defined herein shall have the respective meanings set forth in the Facility Agreement. 
 Except as set forth herein,
the Company has no right, but under certain circumstances may have an obligation, to make payments of Principal prior to the due date for such payments set forth in Section 2.3(b) of the Facility Agreement. At any time an Event of Default
exists, the Principal of this Note, together with all accrued and unpaid Interest and any applicable premium due, if any, may be declared, or shall otherwise become, due and payable in the manner, at the price and with the effect provided in the
Facility Agreement. 







 1. Definitions. 

(a) Certain Defined Terms. For purposes of this Note, the following terms shall have the following meanings: 

(i) “Affiliate” means any person or entity that, directly or indirectly through one or more intermediaries, controls or is
controlled by or is under common control with a person or entity, as such terms are used in and construed under Rule 144 under the Securities Act (“Rule 144”). With respect to a Holder, any investment fund or managed account that is
managed on a discretionary basis by the same investment manager as such Holder will be deemed to be an Affiliate of such Holder. 
 (ii)
“Applicable Value” means (i) at any time that the Company is subject to the reporting requirements under the Exchange Act, (A) the product of (x) the number of issued and outstanding shares of Common Stock on the date
the Company delivers the Major Transaction Notice (as defined in Section 3(b)) multiplied by (y) the per share closing price of the Common Stock on such date plus (B) the amount of the Company’s debt as shown on the latest
financial statements filed with the SEC (the “Current Financial Statements”) plus (C) the aggregate liquidation preference of each class of the Company’s preferred stock less (D) the amount of cash and cash
equivalents of the Company as shown on the Current Financial Statements; and (ii) at any time that the Company is not subject to the reporting requirements under the Exchange Act, the book value of the Company’s assets as shown on the most
recent financial statements of the Company. 
 (iii) “Bylaws” means the Amended and Restated Bylaws of the Company, as
amended from time to time. 
 (iv) “Cash-Out Major Transaction” means a Major Transaction in which the consideration
payable to holders of capital stock in connection with the Major Transaction (whether paid directly or in liquidation of the Company following such Major Transaction) consists solely of cash (whether or not subject to escrows, holdbacks or other
contingencies). 
 (v) “Charter” means the Company’s certificate of incorporation, as it may be amended or restated
from time to time. 
 (vi) “Common Stock” means the common stock, par value $0.001 per share, of the Company. 

(vii) “Conversion Amount” means the sum of (A) the Principal to be converted, redeemed or otherwise exchanged with
respect to which this determination is being made and (B) the amount of all accrued and unpaid Interest on the Principal to be converted, redeemed or otherwise exchanged with respect to which this determination is being made (the “Interest
Amount”). 
 (viii) “Conversion Price” means, as of any Conversion Date or other date of determination, $0.78 per
Series D Preferred Share, subject to adjustment as provided herein; provided, however, that from and after the Mandatory Conversion Time, the “Conversion Price” shall equal the Conversion Price in effect immediately prior to such Mandatory
Conversion Time divided by the number of shares of Common Stock that would have been issuable upon such Mandatory Conversion Time in respect of a share of Series D Preferred Shares, as applicable, subject to further adjustment as provided herein.


  
 2. 








 (ix) “Dollars” or “$” means United States
Dollars. 
 (x) “Eligible Market” means the New York Stock Exchange, Inc., the NYSE Arca, the NASDAQ Capital Market, the
NASDAQ Global Market, the NASDAQ Global Select Market or the NYSE Alternext U.S. 
 (xi) “Exchange Act” means the
Securities Exchange Act of 1934, as amended. 
 (xii) “Fair Market Value” means the fair market value as mutually
determined by the Company and Required Note Holders, subject to the dispute resolution provisions set forth in Section 2(c)(iii) below. 

(xiii) “Initial Holder” means Deerfield Private Design Fund III, L.P. 

(xiv) “Interest” means any interest (including any default interest) accrued on the Principal pursuant to the terms of this
Note and the Facility Agreement. 
 (xv) “Investor Agreements” means the Right of First Refusal and Co-Sale
Agreement, the Investors’ Rights Agreement (the “Investor Rights Agreement”) and the Voting Agreement, in each case, dated as of June 2, 2014, by and among the Company, the Initial Holder and the stockholders party thereto, as
amended or restated from time to time in accordance with the terms thereof. 
 (xvi) “IPO Event” means the date on which
shares of the Common Stock become registered under the Securities Act. 
 (xvii) “Issuance Date” means June 2, 2014,
regardless of any exchange or replacement hereof. 
 (xviii) “Major Transaction” means any of the following
events: 
 (A) a consolidation, merger, exchange of shares, recapitalization, reorganization, business combination or other similar event,
(1) following which the holders of shares of voting stock immediately preceding such consolidation, merger, exchange, recapitalization, reorganization, combination or event either (a) no longer hold a majority of the shares of voting stock
of the Company or (b) no longer have the ability to elect a majority of the board of directors of the Company, or (2) as a result of which Shares or shares of the Company’s voting stock shall be changed into (or the holders of Shares
or shares of the Company’s voting stock become entitled to receive) the same or a different number of shares of the same or another class or classes of stock or securities of another entity, other than such an event undertaken to adopt a
holding company structure without otherwise changing the relative holdings of capital stock (any event following which or resulting in the conditions described in the foregoing clauses (1) or (2), collectively, a “Change of Control
Transaction”); 

  
 3. 








 (B) the sale or transfer in one transaction or a series of related transactions of (i) all
or substantially all of the assets of the Company to any Person or (ii) assets of the Company for a purchase price equal to more than 50% of the Applicable Value (as defined below); 

(C) a third-party purchase, tender or exchange offer made to the holders of outstanding Conversion Shares or shares of any class(es) or
series capital stock, such that following such purchase, tender or exchange offer a Change of Control Transaction shall have occurred; 

(D) the liquidation, bankruptcy, insolvency, dissolution or winding-up (or the occurrence of any analogous proceeding) affecting the Company;

 (E) after an IPO Event the shares of Common Stock cease to be listed on any Eligible Market on which they are then listed or quoted and
are not promptly re-listed or requoted on an Eligible Market; 
 (F) at any time after an IPO Event, the shares of Common Stock cease to be
registered under Section 12 of the Exchange Act; or 
 (G) an “Event of Liquidation” under the Company’s Amended and
Restated Certificate of Incorporation. 
 provided, however, that a Major Transaction or Change of Control shall not be deemed to have occurred solely as a
result of the transfer of ownership of any shares of capital stock of the Company without the consent or agreement of the Company; provided that such proviso shall not apply to an event specified in subsection (G) of the definition of Major
Transaction. 
 (xix) “Mandatory Conversion Time” means the time of any mandatory conversion of the Series D Preferred
Shares required by the Charter. 
 (xx) “Note” means this Senior Secured Convertible Note (including all Senior Secured
Convertible Notes issued in exchange, transfer or replacement hereof, and as may be amended, restated or supplemented from time to time). 

(xxi) “Parent Entity” of a Person means an entity that, directly or indirectly, controls the applicable Person, or, if there
is more than one such Person or Parent Entity, the Person or Parent Entity with the largest enterprise value as of the date of consummation of a Major Transaction. 

(xxii) “Per Share Underlying Common Stock Amount” means the number of shares of Common Stock, at any relevant time, that
would be issuable upon conversion of one Share, reflected as a fraction to the third decimal. 

  
 4. 








 (xxiii) “Person” means an individual, a limited liability company, a
partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity and a government or any department or agency thereof. 

(xxiv) “Principal” means the outstanding principal amount of this Note as of any date of determination. 

(xxv) “Publicly Traded Successor Entity” means a Successor Entity that is a publicly traded corporation whose common stock
is quoted on or listed for trading on an Eligible Market. 
 (xxvi) “Qualified IPO” means the closing of the sale of
shares of the Common Stock to the public at a price of at least $1.25 per share (subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization with respect to Common Stock), in a
firm-commitment underwritten public offering pursuant to an effective registration statement under the Securities Act, with at least $25,000,000 of gross proceeds to the Company and a listing of the Common Stock on the Nasdaq Stock Market or the New
York Stock Exchange. 
 (xxvii) “Required Conversion Conditions” means either of the following occurring prior to
June 30, 2016: (i) the United States Food & Drug Administration (“FDA”) has approved, without requiring the performance of an efficiency study, the New Drug Application for KP201 for the treatment of acute pain or
(ii) both (A) the FDA has accepted the New Drug Application for KP201 for review and (B) a Qualified IPO has occurred. 

(xxviii) “Required Note Holders” means, at any time following the assignment or transfer of a portion of this Note such that
the interest initially represented by this Note is represented by multiple Notes, Holders of at least 50% in interest of the Notes. 

(xxix) “Securities Act” means the Securities Act of 1933, as amended. 

(xxx) “Series D Preferred Shares” means shares of the Series D Preferred Stock. 

(xxxi) “Series D Preferred Stock” means the Company’s Series D Preferred Stock, par value $0.001 per share. 

(xxxii) “Shares” means Series D Preferred Shares, Other Preferred Shares and, following the Mandatory Conversion Time,
shares of Common Stock. 
 (xxxiii) “Successor Entity” means any Person purchasing the Company’s assets sold in a
Major Transaction or a majority of the Company’s capital stock in a Major Transaction, or any successor entity resulting from such Major Transaction, or if the Note is to be convertible for shares of capital stock of its Parent Entity (as
defined above), its Parent Entity. 

  
 5. 








 (xxxiv) “Trading Day” means any day on which trading occurs on the principal
securities exchanges or other securities markets in the United States. 
 2. Conversion Rights. This Note may be converted into
Series D Preferred Shares, shares of Common Stock or Required Conversion Shares (as defined below) on the terms and conditions set forth in this Section 2. 

(a) Conversion at Option of the Holder. At any time, the Holder shall be entitled to convert all or any part of the Principal (and the
Interest Amount thereon) or any Interest accrued hereunder into fully paid and nonassessable Series D Preferred Shares, or, following the Mandatory Conversion Time, shares of Common Stock (collectively, together with any Required Conversion Shares,
the “Conversion Shares”) in accordance with this Section 2 at the Conversion Rate (as defined in Section 2(b)). In addition, the entire Principal shall be convertible into Required Conversion Shares at the
option of the Company, as further set forth in and subject to the terms and conditions set forth in Section 2(h). The Company shall not issue any fraction of a Share upon any conversion. If the issuance would result in the issuance of a
fraction of a Share, then the Company shall round such fraction of a Share up or down to the nearest whole share (with 0.5 rounded up). 

(b) Conversion Rate. The number of Conversion Shares issuable upon a conversion of any portion of this Note pursuant to
Section 2 shall be determined according to the following formula (the “Conversion Rate”): 
  

			
	            Conversion Amount            
	            Conversion Price            

 (c) Mechanics of Conversion. The conversion of this Note shall be conducted in the following manner:

 (i) Holder’s Delivery Requirements. To convert a Conversion Amount into Conversion Shares (other than Required Conversion
Shares) on any date (the “Conversion Date”, which shall also refer to the date of the Required Conversion Notice), the Holder shall (A) transmit by facsimile or electronic mail (or otherwise deliver), for receipt on or prior to
5:00 p.m. New York City time on such date, a copy of an executed conversion notice in the form attached hereto as Exhibit A (the “Conversion Notice”) to the offices of the Company, 2656 Crosspark Road, Suite 100, Carolville,
IA 52241 (Attention: Chief Executive Officer, Fax: (319) 665-2577, Email: rjohnson@kempharm.com), or such other address, facsimile number or email address as the Company may designate in writing, and (B) if required by
Section 2(c)(vi), surrender to a common carrier for delivery to the Company, no later than three (3) Business Days after the Conversion Date, the original Note being converted (or an indemnification undertaking in customary form
with respect to this Note in the case of its loss, theft or destruction). 
 (ii) Company’s Response. Upon receipt or deemed
receipt by the Company of a copy of a Conversion Notice or upon the date of a Required Conversion Notice (as defined below), as applicable, the Company (I) shall as soon as practicable send, via


  
 6. 








 
facsimile, a confirmation of receipt of such Conversion Notice to the Holder and the Company’s designated transfer agent (the “Transfer Agent”), if applicable, which
confirmation shall constitute an instruction to any such Transfer Agent to process such Conversion Notice or Required Conversion Notice in accordance with the terms herein and (II) (A) in the case of a conversion prior to an IPO Event, on or
before the fifthteenth (15th) Business Day following the date of receipt or deemed receipt by the Company of such Conversion Notice, and (B) in the case of a conversion after an IPO
Event, on or before the third (3rd) Business Day following the date of receipt or deemed receipt by the Company of such Conversion Notice or the date of the Required Conversion Notice, as the
case may be (the “Share Delivery Date”), issue and deliver to the address as specified in the Conversion Notice or otherwise specified by the Holder, a stock certificate, registered in the name of the Holder or its designee, for the
number of Conversion Shares to which the Holder shall be entitled. If this Note is submitted for conversion, as may be required by Section 2(c)(vi), and the Principal represented by this Note is greater than the Principal being
converted, then the Company shall, as soon as practicable and in no event later than (1) in the case of a conversion prior to an IPO Event, fifteen (15) Business Days after receipt of this Note, or (2), in the case of a conversion after an
IPO Event, three (3) Business Days (the “Note Delivery Date”) and at its own expense, issue and deliver to the Holder a new Note representing the Principal not converted and cancel this Note. 

(iii) Dispute Resolution. In the case of a dispute as to the determination of the Conversion Price or the Major Transaction Note Early
Termination Price (including any determination as to Fair Market Value) or the arithmetic calculation of the Conversion Rate, the Company shall issue, or instruct the Transfer Agent to issue, as applicable, to the Holder the number of Conversion
Shares that is not disputed and shall transmit an explanation of the disputed determinations or arithmetic calculations to the Holder via facsimile within two (2) Business Days of receipt or deemed receipt of the Holder’s Conversion Notice
or other date of determination. If the Holder and the Company are unable to agree upon the determination of the Conversion Price, Major Transaction Note Early Termination Price or arithmetic calculation of the Conversion Rate within one
(1) Business Day of such disputed determination or arithmetic calculation being transmitted to the Holder, then the Company shall promptly (and in any event within two (2) Business Days) submit via facsimile or email (A) the disputed
determination of the Conversion Price or Major Transaction Note Early Termination Price to an independent, reputable investment banking firm agreed to by the Company and the Required Note Holders, or (B) the disputed arithmetic calculation of
the Conversion Rate to the Company’s independent registered public accounting firm, as the case may be. The Company shall use commercially reasonable best efforts to direct the investment bank or the accounting firm, as the case may be, to
perform the determinations or calculations and notify the Company and the Holder of the results no later than two (2) Business Days from the time it receives the disputed determinations or calculations. Such investment bank’s or accounting
firm’s determination or calculation, as the case may be, shall be binding upon all parties absent manifest error. 
 (iv) Record
Holder. The person or persons entitled to receive the Conversion Shares issuable upon a conversion of this Note shall be treated for all purposes as the legal and record holder or holders of such Shares on the Conversion Date, or in the case of


  
 7. 








 
Conversion Shares the issuance of which is subject to a bona fide dispute that is subject to and being resolved pursuant to, and in compliance with the time periods and other provisions
of, the dispute resolution provisions of Section 2(c)(iii), the first Business Day after the resolution of such bona fide dispute and the fees and expenses of such investment bank or accountant shall be paid by the Company. 

(v) Company’s Failure to Timely Convert. 

(A) Cash Damages. If, on or before the Share Delivery Date, the Company shall fail to issue and deliver a certificate to the Holder
for the number of Conversion Shares (free of any restrictive legend if the Unrestricted Conditions (as defined below) are met) to which the Holder is entitled upon the Holder’s conversion of any Conversion Amount, or if the Company fails to
issue and deliver a new Note representing the Principal to which such Holder is entitled on or before the Note Delivery Date pursuant to Section 2(c)(ii), then in addition to all other available remedies that the Holder may pursue
hereunder and under the Facility Agreement, the Company shall pay additional damages to the Holder for each 30-day period (prorated for any partial period) after the Share Delivery Date such conversion is not timely effected and/or each day after
the Note Delivery Date such Note is not delivered in an amount equal to (x) in the case of a failure to deliver a certificate for the Conversion Shares, one percent (1%) of the Conversion Amount or (y) in the case of a failure to
deliver a new Note, one percent (1%) of the outstanding balance of the new Note. If the Company fails to pay the additional damages set forth in this Section 2(c)(v)(A) within five (5) Business Days of the date incurred, then the
Holder entitled to such payments shall have the right at any time, so long as the Company continues to fail to make such payments, to require the Company, upon written notice, to immediately issue, in lieu of such damages payments described herein,
the number of Shares equal to the quotient of (X) the aggregate amount of the damages payments described in this Section 2(c)(v)(A) divided by (Y) the lower of (i) the Conversion Price in effect on such Conversion Date as
specified by the Holder in the Conversion Note and (ii) the Fair Market Value Price per Conversion Share on the date of the Conversion Notice. 

(B) Void Conversion Notice. If for any reason the Holder has not received all of the Conversion Shares prior to the tenth
(10th) Business Day after the Share Delivery Date (a “Conversion Failure”), then the Holder, upon written notice to the Company (a “Void Conversion Notice”) delivered prior to the receipt of such Conversion
Shares, may void such applicable conversion with respect to, and retain or have returned, as the case may be, any portion of this Note that has not been converted pursuant to such notice; provided, that the voiding of such conversion shall not
affect the Company’s obligations to make any payments that have accrued prior to the date of such notice pursuant to Section 2(c)(v)(A), 2(c)(v)(C) or otherwise. 

(C) Event of Default. A Conversion Failure shall constitute an Event of Default under the Facility Agreement and entitle the Lenders
to all payments and remedies provided under the Facility Agreement upon the occurrence of an Event of Default. 

  
 8. 








 (vi) Book-Entry. Notwithstanding anything to the contrary set forth herein, upon
conversion or redemption of this Note in accordance with the terms hereof, the Holder shall not be required to physically surrender this Note to the Company unless all of the Principal is being converted or redeemed. The Holder and the Company shall
maintain records showing the Principal converted or redeemed and the dates of such conversions or redemptions or shall use such other method, reasonably satisfactory to the Holder and the Company, so as not to require physical surrender of this Note
upon any such partial conversion or redemption. Notwithstanding the foregoing, if this Note is converted or redeemed as aforesaid, the Holder may not transfer this Note unless the Holder first physically surrenders this Note to the Company,
whereupon the Company will forthwith issue and deliver upon the order of the Holder a new Note of like tenor, registered as the Holder may request, representing in the aggregate the remaining Principal represented by this Note. The Holder and any
assignee, by acceptance of this Note, acknowledge and agree that, by reason of the provisions of this paragraph, following conversion or redemption of any portion of this Note, the Principal of this Note may be less than the principal amount stated
on the face hereof. 
 (d) Taxes. The Company shall pay any and all taxes (excluding income taxes, franchise taxes or other taxes
levied on gross earnings, profits or the like of the Holder) that may be payable with respect to the issuance and delivery of Conversion Shares upon the conversion of this Note. 

(e) Legends. 
 (i)
Restrictive Legend. The Holder understands and agrees that, for so long as required pursuant to the Investor Agreements, any Conversion Shares shall contain the restrictive legends required pursuant to the terms of the Investor Agreements
(the “IA Legends”). The Holder further understands and agrees that (A) until the Conversion Shares have been registered for sale or resale under the Securities Act, (B) are eligible for sale pursuant to Rule 144(b)(1)
under the Securities Act without volume restriction or (C) have been sold pursuant to Rule 144, any Conversion Shares shall bear a restrictive legend (the “Securities Legend”) in substantially the following form (and a
stop-transfer order may be placed against transfer of the certificates for such securities): 
 “THE SECURITIES REPRESENTED BY THIS
CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES MAY NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED, HYPOTHECATED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF AN
EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES UNDER SAID ACT, OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER SAID ACT INCLUDING, WITHOUT LIMITATION, PURSUANT TO RULES 144 OR 144A UNDER SAID ACT OR PURSUANT TO A PRIVATE SALE EFFECTED UNDER
APPLICABLE FORMAL OR INFORMAL SEC INTERPRETATION OR GUIDANCE, SUCH AS A SO-CALLED “4(1) AND A HALF” SALE.” 

  
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 (ii) Removal of Restrictive Legends. The certificates evidencing the Conversion Shares
shall not contain the Securities Legend and no legend (other than the IA Legends, if required under the Investor Agreements) shall apply restricting the transfer thereof (any such legend that the certificates evidencing the Conversion Shares shall
not so contain or that shall not so apply to the Conversion Shares, as applicable, a “Removable Legend”): (A) while a registration statement covering the sale or resale of such security is effective under the Securities Act, or
(B) following any sale of such Conversion Shares pursuant to Rule 144, or (C) if such Conversion Shares are eligible for sale under Rule 144(b)(1) without volume restriction or (D) if transfer restrictions are not required under
applicable requirements of the Securities Act (including judicial interpretations and pronouncements issued by the staff of the SEC) (collectively, the “Unrestricted Conditions”). The Company shall use best efforts to cause its
counsel to issue a legal opinion to the Transfer Agent promptly at such time as the Unrestricted Conditions have been satisfied, if required by the Transfer Agent to issue a certificate evidencing the Conversion Shares without the Removable Legends.
If the Unrestricted Conditions are met at the time of issuance of the Conversion Shares, then the Conversion Shares shall be issued free of all Removable Legends. The Company agrees that following such time as the Unrestricted Conditions are met, it
will, no later than three (3) Trading Days following the delivery (the “Unlegended Shares Delivery Deadline”) by the Holder to the Company or the Transfer Agent, if applicable, of a certificate representing Conversion Shares
issued with the Removable Legends (such third Trading Day following such delivery, the “Legend Removal Date”), deliver or cause to be delivered to such Holder one or more certificates evidencing such Conversion Shares that do not
contain the Removable Legends and/or a confirmation confirming in respect of such shares that they are free from the Removable Legends. 

(iii) Sale of Unlegended Shares. Holder agrees that the removal of any restrictive legends from any securities as set forth in this
Section 2(e) is predicated upon the Company’s reliance that the Holder will sell such Conversion Shares pursuant to either the registration requirements of the Securities Act, including any applicable prospectus delivery
requirements, or an exemption therefrom, and that if such securities are sold pursuant to a registration statement, they will be sold in compliance with the plan of distribution set forth therein. 

(f) Adjustments to Conversion Price. 

(i) Adjustment of Conversion Price upon Issuance of Common Stock, Options, Convertible Securities, Etc. 

(A) If at any time after the Mandatory Conversion Time for so long as this Note is outstanding, the Company (x) issues or sells any
Common Stock, Convertible Securities, warrants, or Options or (y) directly or indirectly effectively reduces the conversion, exercise or exchange price for any Convertible Securities or Options which are currently outstanding, at or to an
effective Per Share Selling Price (as defined below) which is less than the greater of (I) the closing sale price per share of the Common Stock on the principal securities exchange, trading market or quotation system on which shares of Common
Stock are 

  
 10. 








 
then traded, listed or quoted on the Trading Day immediately preceding such issue or sale (“Fair Market Price”), or (II) the Conversion Price, then in each such case the Conversion
Price in effect immediately prior to such issue or sale date, as applicable, shall be automatically reduced effective concurrently with such issue or sale to an amount determined by multiplying the Conversion Price then in effect by a fraction,
(x) the numerator of which shall be the sum of (1) the number of shares of Common Stock outstanding immediately prior to such issue or sale, plus (2) the number of shares of Common Stock which the aggregate consideration received by
the Company for such additional shares would purchase at such Fair Market Price or Conversion Price, as the case may be, and (y) the denominator of which shall be the number of shares of Common Stock of the Company outstanding immediately after
such issue or sale. The foregoing provision shall not apply to any issuances or sales of Common Stock or Convertible Securities (i) pursuant to any Convertible Securities or Options currently outstanding on the date hereof in accordance with
the terms of such Convertible Securities in effect on the date hereof provided that such securities have not been amended since the date hereof to directly or indirectly effectively reduce the conversion, exercise or exchange price for any
Convertible Securities or Options which are currently outstanding, or (ii) any Common Stock issued or issuable upon exercise of any options to employees, officers, directors, consultants and advisors (and any individuals who have accepted an
offer of employment), in each case in connection with any Approved Stock Plan (as defined below). 
 For the purposes of the foregoing adjustments, in the
case of the issuance of any Convertible Securities or Options, the maximum number of shares of Common Stock issuable upon exercise, exchange or conversion of such Convertible Securities or Options shall be deemed to be outstanding, provided that no
further adjustment shall be made upon the actual issuance of Common Stock upon exercise, exchange or conversion of such Convertible Securities or Options, and provided further that to the extent such Convertible Securities or Options expire or
terminate unconverted or unexercised, then at such time the Conversion Price shall be readjusted as if such portion of such Convertible Securities or Options had not been issued. 

For purposes of this Section 2(f), if an event occurs that triggers more than one of the above adjustment provisions, then only one adjustment shall be
made and the calculation method which yields the greatest downward adjustment in the Conversion Price shall be used. 
 (B) Record
Date. If the Company takes a record of the holders of Shares for the purpose of entitling them (1) to receive a dividend or other distribution payable in shares of Common Stock, Options or in Convertible Securities or (2) to subscribe
for or purchase shares of Common Stock, Options or Convertible Securities, then such record date will be deemed to be the date of the issue or sale of the Shares deemed to have been issued or sold upon the declaration of such dividend or the making
of such other distribution or the date of the granting of such right of subscription or purchase, as the case may be. 

  
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 (C) Certain Definitions. For purposes of this Section 2(f), the following
terms have the respective meanings set forth below: 
 (I) “Approved Stock Plan” means any employee benefit plan which has
been duly adopted by a majority of the non-employee members of the Board of Directors of the Company or a majority of the members of a committee of non- employee directors established for such purpose, pursuant to which the Company’s securities
may be issued to any employee, consultant, advisor, officer or director (or any individual who has accepted an offer of employment) for services provided to the Company, and in all cases, providing for a Conversion Price that is at or above the fair
market value (as defined in such Approved Stock Plan). 
 (II) “Convertible Securities” means any stock or securities
(other than Options) directly or indirectly convertible into or exchangeable or exercisable for shares of Common Stock. 
 (III)
“Exempt Issuances” shall mean: (i) prior to the IPO Event, the actual or deemed issuance of any Exempted Securities (as defined in the Charter), and (ii) on or after the IPO Event, the issuance of (a) any Common Stock
issued or issuable upon exercise of any options to employees, officers, directors, consultants and advisors (and any individuals who have accepted an offer of employment), in each case in connection with any Approved Stock Plan, up to a maximum
amount of Common Stock not to exceed in any one calendar year 5% of the total number of outstanding shares of the Company (as of the beginning of such calendar year, (b) securities upon the exercise, exchange of, conversion or redemption of, or
payment of interest or liquidated or similar damages on, any Common Stock issued hereunder, (c) other securities exercisable, exchangeable for, convertible into, or redeemable for shares of Common Stock issued and outstanding on the date of
this Note, provided that such securities have not been amended since the date of this Note to directly or indirectly increase the number of such securities or to decrease the exercise, exchange or conversion price of such securities (and including
any issuances of securities pursuant to the anti- dilution provisions of any such securities), and (d) the issuance of Common Stock, Options, Convertible Securities, stock appreciation rights, phantom stock rights or other rights with equity
features (collectively, “Management Incentives”) issued or granted to employees, officers, directors, consultants and advisors (and individuals who have accepted an offer of employment), which Management Incentives have been
approved by the Required Note Holders. 
 (IV) “Options” means any rights, warrants or options to subscribe for or
purchase shares of Common Stock or Convertible Securities. 
 (V) “Per Share Selling Price” shall include the amount
actually paid by third parties for each share of Common Stock in a sale or issuance by the Company. In the event a fee is paid by the Company in connection with such transaction directly or indirectly to such third party or its affiliates, any such
fee shall be deducted from the selling price pro rata to all shares sold in the transaction to arrive at the Per Share Selling Price. A sale of shares of Common Stock shall include the sale or issuance of Convertible Securities or Options, and in
such circumstances the Per Share Selling Price of the Common Stock covered thereby shall also include the exercise, exchange or conversion price thereof (in addition to the consideration received by the Company upon such sale or issuance less the
fee amount as 

  
 12. 








 
provided above). In case of any such security issued in a transaction in which the purchase price or the conversion, exchange or exercise price is directly or indirectly subject to adjustment or
reset based on a future date, future trading prices of the Common Stock, specified or contingent events directly or indirectly related to the business of the Company or the market for the Common Stock, or otherwise (but excluding standard stock
split anti-dilution provisions or weighted-average anti-dilution provisions similar to that set forth herein, provided that any actual reduction of such price under any such security pursuant to such weighted-average anti-dilution provision shall be
included and cause an adjustment hereunder), the Per Share Selling Price shall be deemed to be the lowest conversion, exchange, exercise or reset price at which such securities are converted, exchanged, exercised or reset or might have been
converted, exchanged, exercised or reset, or the lowest adjustment, as the case may be, over the life of such securities. If shares are issued for a consideration other than cash, the Per Share Selling Price shall be the fair value of such
consideration as determined in good faith by independent certified public accountants mutually acceptable to the Company and the Holder. In the event the Company directly or indirectly effectively reduces the conversion, exercise or exchange price
for any Convertible Securities or Options which are currently outstanding, then the Per Share Selling Price shall equal such effectively reduced conversion, exercise or exchange price. 

(ii) Adjustment of Conversion Price upon Subdivision or Combination of Shares. If the Company at any time on or after the Issuance
Date subdivides (by any stock split, stock dividend, recapitalization or otherwise) outstanding Shares into a greater number of Shares, the Conversion Price in effect immediately prior to such subdivision will be proportionately reduced. If the
Company at any time on or after the Issuance Date combines (by combination, reverse stock split or otherwise) its outstanding Shares into a lesser number of Shares, the Conversion Price in effect immediately prior to such combination will be
proportionately increased. 
 (iii) Adjustment of Conversion Price upon a Distribution of Assets. If the Company at any time on or
after the Issuance Date shall declare or make any dividend or other distribution of its assets (or rights to acquire its assets) to holders of Shares, by way of return of capital or otherwise (including any distribution of cash, stock or other
securities, property or options by way of a dividend, spin-off, reclassification, corporate rearrangement or other similar transaction (a “Distribution”), then, in each such case, the applicable Conversion Prices in effect
immediately prior to the close of business on the date fixed for the determination of holders of Shares entitled to receive the Distribution shall be reduced, effective as of the close of business on such date, to a price determined by multiplying
such applicable Conversion Price by a fraction of which (A) the numerator shall be the Fair Market Value of one Share immediately preceding such date minus the Fair Market Value of the Distribution applicable to one Share, and (B) the
denominator shall be the Fair Market Value of one Share on the Trading Day immediately preceding such date. 
 (iv) Recapitalization or
Reclassification. In the event of any reclassification, recapitalization, reorganization, or change affecting the Shares, or any automatic 

  
 13. 








 
or mandatory conversion of all of the outstanding shares of the class or series of capital stock for which this Note is then convertible (except for a conversion of the Series D Preferred Shares
into Common Stock, which this Note handles by its terms), this Note shall become convertible for the kind and amount of shares of stock and other securities and property receivable in connection with such reclassification, reorganization, change or
conversion by a holder of the same number of Conversion Shares as were purchasable by the Holder pursuant to conversion hereof immediately prior to such reclassification, reorganization, change or conversion. In any such case, appropriate provisions
shall be made with respect to the rights and interest of the Holder so that the provisions hereof shall thereafter be applicable with respect to any shares of stock or other securities and property deliverable upon conversion hereof, and appropriate
adjustments shall be made to the Conversion Price payable hereunder, provided the aggregate Conversion Price shall remain the same. 
 (v)
Adjustment for Tax Purposes. The Company shall be entitled to make such reductions in the Conversion Price, in addition to those otherwise required by this Section 2(f), as the Company’s Board of Directors in its discretion
shall determine to be advisable in order that any stock dividends, subdivisions of shares, distribution of rights to purchase stock or securities, or any distribution of securities convertible into or exchangeable for stock, made after the Issuance
Date by the Company to its stockholders shall not be taxable. 
 (vi) Other Events. If any event occurs of the type contemplated by
the provisions of this Section 2(f) but not expressly provided for by such provisions (including the granting of stock appreciation rights, phantom stock rights or other rights with equity features), then the Company’s Board of
Directors will make an appropriate adjustment in the Conversion Price so as to protect the rights of the Holder; provided that no such adjustment will increase the Conversion Price as otherwise determined pursuant to this
Section 2(f). 
 (vii) Notices. Promptly upon any adjustment of the Conversion Price, the Company will give written
notice thereof to the Holder, setting forth in reasonable detail, and certifying, the calculation of such adjustment. The Company will give written notice to the Holder at least ten (10) Business Days prior to the date on which the Company
closes its books or takes a record (I) with respect to any dividend or distribution upon the Common Stock or the Shares, (II) with respect to any pro rata subscription offer to holders of Common Stock or Shares or (III) for determining rights
to vote with respect to any Major Transaction, provided that, if such notice is to be provided after the IPO Event, such information shall be made known to the public prior to or in conjunction with such notice being provided to the Holder.
The Company will also give written notice to the Holder with respect to any Major Transaction as provided under Section 3(b) below. 

(g) Adjustments for Diluting Issuances. The number of shares of Common Stock (or the number and type of other securities, as
applicable) issuable upon conversion pursuant to the Charter of the Series D Preferred Shares into which this Note is initially convertible is subject to adjustment, from time to time, in the manner set forth in the Charter and/or Bylaws as if the
Series D Preferred Shares into which this Note is convertible were issued and outstanding on and as of the date of any such required adjustment. The provisions set forth 

  
 14. 








 
in the Charter and/or Bylaws (and any amendment thereto) relating to adjustments to the Common Stock (or the number and type of other securities) into which Series D Preferred Shares are
convertible pursuant thereto in effect as of the date hereof may not be amended, modified or waived, in a manner adverse to the holders of the shares of Series D Preferred Stock, without the prior written consent of the Holder unless (i) such
amendment, modification or waiver applies on its face to all shares of Series D Preferred Stock in the same manner or (ii) such amendment, modification or waiver is approved by the Required Note Holders). Nothing in this subsection
(g) shall in any way derogate from any other rights of the Holder set forth herein. 
 (h) Required Conversion. For the seven
(7) Business Day period following the satisfaction of the Required Conversion Conditions, the Company may notify the Holder in writing (a “Required Conversion Notice”) of its election to require the Holder to convert the entire
principal amount of this Note then outstanding (subject to subsection (i) below) into Conversion Shares (a “Required Conversion”). Following receipt of a Required Conversion Notice, the Holder shall be entitled to receive the
Conversion Shares in respect of such Required Conversion Notice within the time frame set forth in this Section 2 with respect to Conversion Shares. 

(i) Limitations on Conversion. Notwithstanding anything herein to the contrary, the Company shall not issue to the Holder, and the
Holder may not acquire, a number of Conversion Shares upon conversion of this Warrant to the extent that, upon such exercise, the number of shares of Common Stock then beneficially owned by the Holder and its Affiliates and any other persons or
entities whose beneficial ownership of Common Stock would be aggregated with the Holder’s for purposes of Section 13(d) of the Exchange Act (including shares held by any “group” of which the Holder is a member, but excluding
shares beneficially owned by virtue of the ownership of securities or rights to acquire securities that have limitations on the right to convert, exercise or purchase similar to the limitation set forth herein) would exceed 9.985% of the total
number of the shares of Common Stock then issued and outstanding (the “9.985% Cap”)); provided that the 9.985% Cap shall not apply to the extent that shares of Common Stock are not deemed to constitute “equity securities”
pursuant to Rule 13d-1(i) under the Exchange Act and, provided further, that the 9.985% Cap shall not apply to an exercise effected following receipt of a Major Transaction Notice (as defined below) in respect of a Major Transaction (as defined
below) described in clause (A) of the definition of Major Transaction above in which the Company will not be the surviving entity, until consummation or abandonment of such Major Transaction and, provided further, that the 9.985% Cap shall not
apply to the conversion of this Note into IPO Conversion Shares. For the avoidance of doubt, a conversion hereunder (whether at the election of the Holder or the Company) shall be null and void to the extent the issuance of shares upon such
conversion would violate this subsection (i). 
 3. Rights Upon Major Transaction. Notwithstanding anything contained herein or in
the Facility Agreement to the contrary, in the event that a Major Transaction occurs, then the Holder, at its option, may require the Company to redeem all or any portion of the Principal (and the Interest Amount thereon) outstanding on the
Holder’s Notes for cash in accordance with Section 3(b) below. In the event the Holder shall not have exercised any of its rights under the immediately preceding sentence within the applicable time periods set forth herein, then the


  
 15. 








 
Major Transaction shall be treated as an Assumption (as defined below) in accordance with Section 3(a) below unless the Holder waives its rights under this Section 3 with
respect to such Major Transaction. For the avoidance of doubt, the Holder may waive the above provisions of this Section 3 with respect to any Major Transaction and, without limitation, may elect to convert this Note in accordance with the
other terms hereof prior to any Major Transaction. 
 (a) Assumption. The Company shall not enter into or be party to a Major
Transaction that is to be treated as an Assumption pursuant to this Section 3, unless any Successor Entity assumes in writing all of the obligations of the Company under this Note and provides (a) registration rights that are comparable to
those provided to the initial Holder under the Investor Rights Agreement, if the Successor Entity is not a Publicly Traded Successor Entity, or (B) resale registration rights reasonably acceptable to the Holder, if the Successor Entity is a
Publicly Traded Successor Entity, in accordance with the provisions of this Section 3(a) pursuant to written agreements and instruments in form and substance reasonably satisfactory to the Holder and approved by the Holder prior to such
Major Transaction (not to be unreasonably withheld or delayed), including a security of the Successor Entity evidenced by a written instrument (a “Replacement Note”) substantially similar in form and substance to the Notes,
including, without limitation, representing the appropriate number of shares of the Successor Entity, having similar conversion rights as the Notes (including but not limited to a similar Conversion Price and similar Conversion Price adjustment
provisions based on the price per share or conversion ratio, and taking into account any cash consideration, to be received by the holders of Conversion Shares in the Major Transaction) and providing for conversion into the shares of the Successor
Entity into or for which shares of the same class and series as the Shares are to be converted or exchanged (“Successor Conversion Shares”). Upon the occurrence of any Major Transaction, but only if a Replacement Note has not been
delivered to the Holder in connection therewith, any Successor Entity shall succeed to, and be substituted for (so that from and after the date of such Major Transaction, the provisions of this Note referring to the “Company” shall refer
instead to the Successor Entity), and may exercise every right and power of the Company and shall assume all of the obligations of the Company under this Note with the same effect as if such Successor Entity had been named as the Company herein.
Upon consummation of the Major Transaction, but only if a Replacement Note has not been delivered to the Holder in connection therewith, any Successor Entity shall deliver to the Holder confirmation that there shall be issued upon conversion or
redemption of this Note at any time after the consummation of the Major Transaction, in lieu of the Conversion Shares (or other securities, cash, assets or other property) issuable upon the conversion of the Notes prior to such Major Transaction,
such Successor Conversion Shares in accordance with the provisions of this Note. The provisions of this Section shall apply similarly and equally to successive Major Transactions and shall be applied without regard to any limitations on the
conversion of this Note, including any applicable beneficial ownership limitations. Any assumption of Company obligations under this paragraph shall be referred to herein as an “Assumption.” 

(b) Notice; Major Transaction Early Termination Right. At least fifteen (15) days prior to the consummation of any Major
Transaction, but, in any event, within five (5) Business Days following the first to occur of (x) the date of the public announcement of such Major Transaction if such announcement is made before 4:00 p.m., New York City time, (y) the


  
 16. 








 
day following the public announcement of such Major Transaction if such announcement is made on and after 4:00 p.m., New York City time, and (z) the date of execution of the definitive
agreement with respect to a Major Transaction, if such agreement is executed prior to an IPO Event, the Company shall deliver written notice thereof via facsimile and overnight courier to the Holder (a “Major Transaction Notice”).
At any time during the period beginning after the Holder’s receipt of a Major Transaction Notice and ending five (5) Trading Days prior to the consummation of such Major Transaction (the “Early Termination Period”), the
Holder may require the Company to redeem (an “Early Termination Upon Major Transaction”) all or any portion of the outstanding portion of this Note (without regard to any ownership limitations) by delivering written notice thereof
(“Major Transaction Early Termination Notice”) to the Company, which Major Transaction Early Termination Notice shall indicate the portion (the “Early Termination Portion”) of this Note that the Holder is electing
to have so redeemed. The Early Termination Portion shall be redeemed by the Company at a price (the “Major Transaction Note Early Termination Price”) payable in cash equal to the greater of (1) the Principal amount of the Early
Termination Portion and the Interest Amount thereon (additionally including, for this purpose, any interest that would have accrued on such Principal amount from the date of the Major Transaction until the then applicable maturity date of the Note
were such Principal amount on the Note outstanding throughout such period), and (2) the amount of cash payable or distributable per Conversion Share plus the Fair Market Value of any property (other than cash) payable or distributable per
Conversion Share (or the shares of Common Stock into which such Conversion Shares are then convertible, if greater), in each case, pursuant to the terms of the Charter in connection with such Major Transaction. 

(c) Payment of Major Transaction Note Early Termination Price. Following the receipt of a Major Transaction Early Termination Notice
from the Holder, the Company shall not effect a Major Transaction that is being treated as an early termination unless it obtains the written agreement of any Successor Entity that payment of the Major Transaction Note Early Termination Price shall
be made to the Holder prior to or concurrently with consummation of such Major Transaction (subject to any holdbacks or escrows applicable to such payment pursuant to the applicable acquisition agreement and subject to standard non-material
conditions on such payment imposed by such Successor Entity, such as surrender of this Note and delivery of a letter of transmittal and an applicable IRS Form W-9 or applicable W-8, if applicable), and such payment shall be a condition precedent or
concurrent to consummation of such Major Transaction. 
 (d) Injunction. Following the receipt of a Major Transaction Early
Termination Notice from the Holder, in the event that the Company attempts to consummate a Major Transaction without the Major Transaction Note Early Termination Price being paid to the Holder prior to or concurrently with the consummation of such
Major Transaction in accordance with Section 3(c) above, or obtaining any written agreement of the Successor Entity required by Section 3(c) above, the Holder shall have the right to apply for an injunction in any state or
federal courts sitting in the City of New York, borough of Manhattan to prevent the closing of such Major Transaction until the Major Transaction Note Early Termination Price is paid to the Holder, in full. 

  
 17. 








 Any payment determined pursuant to clause (1) of Section 3(b) in connection
with an early termination shall have priority to payments to holders of capital stock in connection with a Major Transaction and to the extent an early termination required by this Section 3 is deemed or determined by a court of
competent jurisdiction to be prepayments of the Note by the Company, such early termination shall be deemed to be voluntary prepayments. Notwithstanding anything to the contrary in this Section 3, until the Major Transaction Note Early
Termination Price is paid in full (excluding any amount subject to escrows or holdbacks and any other contingent consideration that has not accrued), this Note may be converted, in whole or in part, by the Holder into Shares, or in the event the
Conversion Date is after the consummation of a Major Transaction, Successor Conversion Shares pursuant to this Section 3. The parties hereto agree that in the event of the early termination of any portion of the Note under this
Section 3, the Holder’s damages would be uncertain and difficult to estimate because of the parties’ inability to predict future interest rates and the uncertainty of the availability of a suitable substitute investment
opportunity for the Holder. Accordingly, any premium due under this Section 3 is intended by the parties to be, and shall be deemed, a reasonable estimate of the Holder’s actual loss of its investment opportunity and not as a
penalty. 
 4. Amendment; Waiver. The terms and provisions of this Note shall not be amended or waived except in a writing signed by
the Company and the Holder, provided that the Company and the Required Note Holders may in writing amend the Notes on behalf of all of the Holders of Notes. 

5. Remedies, Characterizations, Other Obligations, Breaches and Injunctive Relief. The remedies provided in this Note shall be
cumulative and in addition to all other remedies available under this Note, the Facility Agreement, at law or in equity (including a decree of specific performance and/or other injunctive relief). No remedy contained herein shall be deemed a waiver
of compliance with the provisions giving rise to such remedy, and nothing herein shall limit the Holder’s right to pursue actual damages for any failure by the Company to comply with the terms of this Note. The Company covenants to the Holder
that, except as may be set forth in the Facility Agreement, there shall be no characterization concerning this instrument other than as expressly provided herein. Amounts set forth or provided for herein with respect to payments, conversion and the
like (and the computation thereof) shall be the amounts to be received by the Holder thereof and shall not, except as expressly provided herein, be subject to any other obligation of the Company (or the performance thereof). The Company acknowledges
that a breach by it of its obligations hereunder will cause irreparable harm to the Holder and that the remedy at law for any such breach may be inadequate. The Company therefore agrees that, in the event of any such breach or threatened breach, the
Holder shall be entitled, in addition to all other available remedies, to an injunction restraining any breach, without the necessity of showing economic loss and without any bond or other security being required. 

6. Specific Shall Not Limit General; Construction. No specific provision contained in this Note shall limit or modify any more general
provision contained herein. This Note shall be deemed to be jointly drafted by the Company and all purchasers of Notes pursuant to the Facility Agreement and shall not be construed against any Person as the drafter hereof. 

  
 18. 








 7. Failure or Indulgence Not Waiver. No failure or delay on the part of the Holder in the
exercise of any power, right or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such power, right or privilege preclude other or further exercise thereof or of any other right, power or
privilege. 
 8. Notices. Whenever notice is required to be given under this Note, unless otherwise provided herein, such notice
shall be given in accordance with Section 4.1 of the Facility Agreement. 
 9. Restrictions on Transfer. 

(a) Registration or Exemption Required. This Note has been issued in a transaction exempt from the registration requirements of the
Securities Act by virtue of Regulation D and exempt from state registration or qualification under applicable state laws. None of the Note or the Conversion Shares may be pledged, transferred, sold, assigned, hypothecated or otherwise disposed of
except pursuant to an effective registration statement or an exemption to the registration requirements of the Securities Act and applicable state laws including, without limitation, a so-called “4(1) and a half” transaction. 

(b) Assignment. Subject to Section 6.5 of the Facility Agreement, the Holder may sell, transfer, assign, pledge,
hypothecate or otherwise dispose (collectively, “Transfer”) of this Note, in whole or in part. Holder shall deliver a written notice to Company, substantially in the form of the Assignment attached hereto as Exhibit B,
indicating the Person or Persons to whom the Note shall be Transferred and the respective principal amount of the Note to be Transferred to each assignee. The Company shall effect the Transfer within (i) five (5) Business Days, in the case
of a transfer occurring prior to an IPO Event, and (ii) three (3) Business Days, in the case of a transfer occurring following the IPO Event (the “Transfer Delivery Period”), and shall deliver to the assignee(s) designated
by Holder a Note or Notes of like tenor and terms for the appropriate principal amount. This Note and the rights evidenced hereby shall inure to the benefit of and be binding upon the successors and assigns of the Holder. The provisions of this Note
are intended to be for the benefit of all Holders from time to time of this Note, and shall be enforceable by any such Holder. For avoidance of doubt, in the event Holder notifies the Company that such sale or transfer is a so called “4(1) and
half” transaction, the parties hereto agree that a legal opinion from outside counsel for the Holder delivered to counsel for the Company substantially in the form attached hereto as Exhibit C shall be the only requirement to satisfy an
exemption from registration under the Securities Act to effectuate such “4(1) and half” transaction. 
 10. Payment of
Collection, Enforcement and Other Costs. If (a) this Note is placed in the hands of an attorney for collection or enforcement or is collected or enforced through any legal proceeding; or (b) an attorney is retained to represent the
Holder in any bankruptcy, reorganization, receivership of the Company or other proceedings affecting Company creditors’ rights and involving a claim under this Note, then the Company shall pay the costs incurred by the Holder for such
collection, enforcement or action, including reasonable attorneys’ fees and disbursements. 

  
 19. 








 11. Cancellation. After all Principal, Interest and other amounts at any time owed under,
or on account of, this Note have been paid in full or converted into Shares in accordance with the terms hereof, this Note shall automatically be deemed cancelled, shall be surrendered to the Company for cancellation and shall not be reissued. 

12. Registered Note. This Note may be transferred only upon notation of such transfer on the Register, and no assignment thereof shall
be effective until recorded therein. 
 13. Waiver of Notice. To the extent permitted by law, the Company hereby waives demand,
notice, presentment, protest and all other demands and notices in connection with the delivery, acceptance, performance, default or enforcement of this Note and the Facility Agreement. 

14. Governing Law. All questions concerning the construction, validity, enforcement and interpretation of this Note shall be governed
by and construed and enforced in accordance with the laws of the State of New York applicable to contracts made and to be performed in such State. All legal proceedings concerning the interpretations, enforcement and defense of the transactions
contemplated by this Note (whether brought against a party or its respective affiliates, directors, officers, shareholders, employees or agents) shall be commenced exclusively in the state and federal courts sitting in the City of New York. Each
party hereby irrevocably submits to the exclusive jurisdiction of the state and federal courts sitting in the City of New York, borough of Manhattan 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 improper or is an inconvenient venue for such proceeding. 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 via
registered or certified mail or overnight delivery (with evidence of delivery) to such party at the address in effect for notices to it under this Note 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 other manner permitted by law. The parties hereby waive all rights to a trial by jury. 

15. Interpretative Matters. Unless the context otherwise requires, (a) all references to Sections or Exhibits are to Sections or
Exhibits contained in or attached to this Note, (b) each accounting term not otherwise defined in this Note has the meaning assigned to it in accordance with GAAP, (c) words in the singular or plural include the singular and plural and
pronouns stated in either the masculine, the feminine or neuter gender shall include the masculine, feminine and neuter and (d) the use of the word “including” in this Note shall be by way of example rather than limitation. If a stock
split, stock dividend, stock combination or other similar event occurs during any period over which an average price is being determined, then an appropriate adjustment will be made to such average to reflect such event. 

16. Execution. A facsimile, telecopy, PDF or other reproduction of this Note may be delivered by the Company, and an executed copy of
this Note may be delivered by the Company 

  
 20. 








 
by facsimile, e-mail or other similar electronic transmission device pursuant to which the signature of or on behalf of the Company can be seen, and such execution and delivery shall be
considered valid, binding and effective for all purposes. The Company hereby agrees that it shall not raise the execution of facsimile, PDF or other reproduction of this Note, or the fact that any signature was transmitted by facsimile, e-mail or
other similar electronic transmission device, as a defense to the Company’s execution of this Note. Notwithstanding the foregoing, the Company shall be required to deliver an originally executed Note to the Holder. 

[Signature page follows] 

  
 21. 








 IN WITNESS WHEREOF, the Company has caused this Senior Secured Convertible Note to be duly
executed as of the date first set forth above. 
  

			
	COMPANY:
	
	KEMPHARM, INC.
		
	By:	 	 /s/ Travis C. Mickle










 Exhibit A 

CONVERSION NOTICE 

Reference is made to the Senior Secured Convertible Note (the “Note”) of KEMPHARM, INC., a Delaware corporation (the
“Company”), in the original principal amount of $10,000,000. In accordance with and pursuant to the Note, the undersigned hereby elects to convert the Conversion Amount (as defined in the Note) of the Note indicated below into
shares of the Company, as of the date specified below. 
 Date of
Conversion:                             

Aggregate Conversion Amount to be converted at the Conversion Price (as defined in the Note): 

                       
                                         
         
 Principal, applicable thereto, to be
converted:                                       
                  
 Interest, applicable thereto,
to be
converted:`                                       
                  
 Please confirm the following information: 

Conversion
Price:                                        
                                         
                            

Number of shares of [                    ]
to be
issued:                                        
                     
 Please issue the
[                    ] into which the Note is being converted in the following name and to the following address: 

Issue
to:                                        
                                         
                                         
   
 Facsimile
Number:                                        
                                         
                            

Authorization:                     
                        

By:                      
                               

Title:                      
                           

Dated:                      
                                         
  







 ACKNOWLEDGMENT 

The Company hereby acknowledges this Conversion Notice and hereby directs [TRANSFER AGENT] to issue the above indicated number of shares of
Common Stock in accordance with the Irrevocable Transfer Agent Instructions dated [            ], 2014 from the Company and acknowledged and agreed to by [TRANSFER AGENT]. 

 

			
	KEMPHARM, INC.
		
	By:	 	  

	Name:	 	  

	Title:	 	  










 Exhibit B 

ASSIGNMENT 
 (To be
executed by the registered holder 
 desiring to transfer the Note) 

FOR VALUE RECEIVED, the undersigned holder of the attached Senior Secured Convertible Note (the “Note”) hereby sells, assigns and transfers unto the
person or persons below named the right to receive the principal amount of $             from KEMPHARM, INC., a [            ]
corporation, evidenced by the attached Note and does hereby irrevocably constitute and appoint              attorney to transfer the said Note on the books of the Company, with full power
of substitution in the premises. 
  

			
	Dated:                                     
           	 	  

		 	Signature
		
	Fill in for new registration of Note:	 	
		
	  
	 	
	Name	 	
		
	  
	 	
	Address	 	
		
	  
	 	
	Please print name and address of assignee	 	
	(including zip code number)	 	

 NOTICE 
 The signature to the
foregoing Assignment must correspond to the name as written upon the face of the attached Note in every particular, without alteration or enlargement or any change whatsoever. 







 Exhibit C 

FORM OF OPINION 

            , 20         

[                    ] 

Re: KEMPHARM, INC. (the “Company”) 
 Dear Sir:

 [            ]
(“[            ]”) intends to transfer its Senior Secured Convertible Note in the principal amount of $            
(the “Note”) of the Company to              (“            ”) without registration under the Securities Act of
1933, as amended (the “Securities Act”). In connection herewith, we have examined such documents and issues of law as we have deemed relevant. 

Based on and subject to the foregoing, we are of the opinion that the transfer of the Note by
             to              may be effected without registration under the Securities Act, provided, however, that the Note to
be transferred to              contain a legend restricting its transferability pursuant to the Securities Act and that transfer of the Note is subject to a stop order. 

The foregoing opinion is furnished only to              and may not be used, circulated, quoted or
otherwise referred to or relied upon by you for any purposes other than the purpose for which furnished or by any other person for any purpose, without our prior written consent. 

Very truly yours,