EXHIBIT 4.1


 


FORM OF WARRANT AGENCY AGREEMENT


 


WARRANT AGENCY AGREEMENT
made as of October , 2014 (the “Issuance Date”), between PlasmaTech Biopharmaceuticals, Inc., a Delaware corporation,
with offices at 4848 Lemmon Ave., Suite 517, Dallas, Texas 75219 (the “Company”), and American Stock Transfer &
Trust Company, LLC, with offices at 6201 15th Avenue, Brooklyn, New York 11219 (the “Warrant Agent”).


 


WHEREAS, the Company
is engaged in a public offering (the “Offering”) of up to ______ shares of the Company’s common stock, par value
$0.01 per share (“Common Stock”), and up to _______ Warrants (the “Warrants”), with each such Warrant evidencing
the right of the holder thereof to purchase one share of Common Stock for $____ , subject to adjustment as described herein; and


 


WHEREAS, the Company
has filed with the Securities and Exchange Commission a Registration Statement, No. 333-197220 on Form S-1 (as the same may be
amended from time to time, the “Registration Statement”) for the registration, under the Securities Act of 1933, as
amended (the “Act”) of, among other securities, the Warrants and the Common Stock issuable upon exercise of the Warrants
(the “Warrant Shares”), and such Registration Statement was declared effective on ________, 2014 ; and


 


WHEREAS, the Company
desires the Warrant Agent to act on behalf of the Company, and the Warrant Agent is willing to so act, in connection with the issuance,
registration, transfer, exchange and exercise of the Warrants; and


 


WHEREAS, the Company
desires to provide for the provisions of the Warrants, the terms upon which they shall be issued and exercised, and the respective
rights, limitation of rights, and immunities of the Company, the Warrant Agent, and the holders of the Warrants; and


 


WHEREAS, all acts and
things have been done and performed which are necessary to make the Warrants the valid, binding and legal obligations of the Company,
and to authorize the execution and delivery of this Warrant Agreement.


 


NOW, THEREFORE, in
consideration of the mutual agreements herein contained, the parties hereto agree as follows:


 


1. Appointment of
Warrant Agent. The Company hereby appoints the Warrant Agent to act as agent for the Company for the Warrants, and the Warrant
Agent hereby accepts such appointment and agrees to perform the same in accordance with the express terms and conditions set forth
in this Warrant Agreement (and no implied terms or conditions).


 


2. Warrants.


 


2.1 Form of Warrant.
Each Warrant, whenever issued, shall be issued in registered form only. All of the Warrants shall be represented by one or more
book-entries maintained by the Warrant Agent.


 


2.2. Registration.


 


2.2.1. Warrant Register.
The Warrant Agent shall maintain books (“Warrant Register”), for the registration of original issuance and the registration
of transfer of the Warrants. Upon the initial issuance of the Warrants, the Warrant Agent shall issue and register the Warrants
in the names of the respective holders thereof in such denominations and otherwise in accordance with written instructions delivered
to the Warrant Agent by the Company. All of the Warrants shall be represented by one or more Warrants and registered in the name
of Cede & Co., a nominee of The Depository Trust Company (the “Depository”). Ownership of beneficial interests
in the Warrants shall be shown on, and the transfer of such ownership shall be effected through, records maintained (i) by the
Depository or its nominee for each Warrant; (ii) by institutions that have accounts with the Depository (such institution, with
respect to a Warrant in its account, a “Participant”); or (iii) directly on the book-entry records of the Warrant Agent
with respect only to owners of beneficial interests that represent such direct registration.


 




    	 



    	 



    

  


2.2.2. Beneficial
Owner; Registered Holder. The term “beneficial owner” shall mean any person in whose name ownership of a beneficial
interest in the Warrants evidenced by a Warrant is recorded in the records maintained by the Depository or its nominee. Prior to
due presentment for registration of transfer of any Warrant, the Company and the Warrant Agent may deem and treat the person in
whose name such Warrant shall be registered upon the Warrant Register (“registered holder”), as the absolute owner
of such Warrant and of each Warrant represented thereby, for the purpose of any exercise thereof, and for all other purposes, and
neither the Company nor the Warrant Agent shall be affected by any notice to the contrary.


 


3. Terms and Exercise
of Warrants.


 


3.1. Exercise Price.
Each Warrant shall entitle the registered holder thereof, subject to the provisions of such Warrant and of this Warrant Agreement,
to purchase from the Company the number of shares of Common Stock stated therein, at the price of $ per whole share, subject to
the subsequent adjustments provided in Section 4 hereof. The term “Exercise Price” as used in this Warrant Agreement
refers to the price per share at which Common Stock may be purchased at the time a Warrant is exercised.


 


3.2. Duration of Warrants.
A Warrant may be exercised only during the period (“Exercise Period”) commencing on the Issuance Date and terminating
at 5:00 P.M., New York City time (the “close of business”) on ________, 2019 (“Expiration Date”). Each
Warrant not exercised on or before the Expiration Date shall become void, and all rights thereunder and all rights in respect thereof
under this Warrant Agreement shall cease at the close of business on the Expiration Date.


 


3.3. Exercise of Warrants.


 


3.3.1. Exercise
and Payment. Subject to the provisions of this Warrant Agreement, a registered holder may exercise a Warrant by delivering,
not later than 5:00 P.M., New York time, on any business day during the Exercise Period (the “Exercise Date”) to the
Warrant Agent at its office designated for such purpose (i) the Warrants to be exercised shown on the records of the Depository
to an account of the Warrant Agent at the Depository designated for such purpose in writing by the Warrant Agent to the Depository
from time to time, (ii) an election to purchase the Warrant Shares underlying the Warrants to be exercised (“Election to
Purchase”), properly delivered by the Participant in accordance with the Depository’s procedures, and (iii) the Warrant
Price for each Warrant to be exercised, and all applicable taxes and charges due in connection with the exercise of such Warrants,
in lawful money of the United States of America by certified or official bank check or by bank wire transfer in immediately available
funds.


 


If any of (A) the Warrants,
(B) the Election to Purchase, or (C) the Warrant Price therefor, and all applicable taxes and charges due in connection therewith,
is received by the Warrant Agent after 5:00 P.M., New York time, on any date, or on a date that is not a business day, the Warrants
with respect thereto will be deemed to have been received and exercised on the business day next succeeding such date. For the
avoidance of doubt, the “Exercise Date” will be the date the materials in the foregoing sentence are received by the
Warrant Agent (if by 5:00 P.M., New York time), or the following business day (if after 5:00 P.M., New York time), regardless of
any earlier date written on the materials. If the Warrants are received or deemed to be received after the Expiration Date, the
exercise thereof will be null and void and any funds delivered to the Warrant Agent will be returned to the registered holder or
Participant, as the case may be, as soon as practicable. In no event will interest accrue on any funds deposited with the Warrant
Agent in respect of an exercise or attempted exercise of Warrants. The validity of any exercise of Warrants will be determined
by the Company in its sole discretion and such determination will be final and binding upon the registered holder or Participant
and the Warrant Agent. Neither the Company nor the Warrant Agent shall have any obligation to inform a registered holder or the
Participant, as applicable, of the invalidity of any exercise of Warrants.


 


The Warrant Agent shall
deposit all funds received by it in payment of the Warrant Price in the account of the Company maintained with the Warrant Agent
for such purpose and shall advise the Company via telephone at the end of each day on which funds for the exercise of the Warrants
are received of the amount so deposited to its account. The Warrant Agent shall promptly confirm such telephonic advice to the
Company in writing.


 




    	 



    	 



    

  


3.3.2. Issuance
of Warrant Shares. The Warrant Agent shall, by 11:00 A.M. New York Time on the business day following the Exercise Date of
any Warrant, advise the Company or, if instructed in writing to do so by the Company, the transfer agent and registrar, in respect
of (a) the number of Warrant Shares indicated on the Election to Purchase as issuable upon such exercise with respect to such exercised
Warrants, (b) the instructions of each registered holder or Participant, as the case may be, provided to the Warrant Agent with
respect to the notation that shall be made to the records maintained by the Depository, its nominee for each Warrant, or a Participant,
as appropriate, evidencing the balance, if any, of the Warrants remaining after such exercise and (c) such other information as
the Company shall reasonably request.


 


The Company shall,
by 5:00 P.M., New York time, on the third business day next succeeding the Exercise Date of any Warrant and the clearance of the
funds in payment of the Warrant Price, use its reasonable best efforts to cause its transfer agent to electronically transmit the
Warrant Shares issuable upon exercise to the Depository by crediting the account of the Depository or of the Participant through
its Deposit Withdrawal Agent Commission system. The time periods for delivery described in the immediately preceding paragraph
shall apply to the electronic transmittals described herein.


 


3.3.3. Valid Issuance.
All shares of Common Stock issued by the Company upon the proper exercise of a Warrant in conformity with this Warrant Agreement
shall be validly issued, fully paid and non-assessable.


 


3.3.4. No Fractional
Exercise. Warrants may be exercised only in whole numbers of Warrant Shares. No fractional Warrant Shares are to be issued
upon the exercise of the Warrant, but rather the number of Warrant Shares to be issued shall be rounded up or down, as applicable,
to the nearest whole number. If fewer than all the Warrants evidenced by a Warrant are exercised, a notation shall be made to the
records maintained by the Depository, its nominee for each Warrant, or a Participant, as appropriate, evidencing the balance of
the Warrants remaining after such exercise.


 


3.3.5 No Transfer
Taxes. The Company shall not be required to pay any stamp or other tax or charge required to be paid in connection with any
transfer involved in the issue of the Warrant Shares upon the exercise of Warrants; and in the event that any such transfer is
involved, the Company shall not be required to issue or deliver any Warrant Shares until such tax or other charge shall have been
paid or it has been established to the Company’s and the Warrant Agent’s satisfaction that no such tax or other charge
is due.


 


3.3.6 Date of Issuance.
Each person in whose name any such shares of Common Stock is issued shall for all purposes be deemed to have become the holder
of record of such shares on the date on which the Warrant was validly exercised and payment of the Warrant Price was made, irrespective
of the date of delivery of such Election to Purchase, except that, if the date of such Election to Purchase and payment is a date
when the stock transfer books of the Company are closed, such person shall be deemed to have become the holder of such shares at
the close of business on the next succeeding date on which the stock transfer books are open.


 


3.3.7 Cashless Exercise Under Certain
Circumstances.


 


(i) The Company shall
provide to the Warrant Agent and each registered holder of Warrants prompt written notice of any time that the Company is unable
to issue the Warrant Shares via DTC transfer or otherwise (without restrictive legend), because (A) the Commission has issued a
stop order with respect to the Registration Statement, (B) the Commission otherwise has suspended or withdrawn the effectiveness
of the Registration Statement, either temporarily or permanently, (C) the Company has suspended or withdrawn the effectiveness
of the Registration Statement, either temporarily or permanently, or (D) otherwise (each a “Restrictive Legend Event”).
To the extent that a Restrictive Legend Event occurs after the registered holder has exercised a Warrant in accordance with the
terms of the Warrants but prior to the delivery of the Warrant Shares, the Company shall, at the election of the registered holder,
which shall be given within five (5) days of receipt of such notice of the Restrictive Legend Event, either (A) rescind the previously
submitted Election to Purchase and the Company shall return all consideration paid by registered holder for such shares upon such
rescission or (B) treat the attempted exercise as a cashless exercise as described in the next paragraph and refund the cash portion
of the exercise price to the registered holder.


 




    	 



    	 



    

  


(ii) If a Restrictive
Legend Event has occurred and no exemption from the registration requirements is available, the Warrant shall only be exercisable
on a cashless basis. Notwithstanding anything herein to the contrary, the Company shall not be required to make any cash payments
or net cash settlement to the registered holder in lieu of issuance of the Warrant Shares. Upon a “cashless exercise”,
the Holder shall be entitled to receive the number of Warrant Shares equal to the quotient obtained by dividing [(A-B) (X)] by
(A), where:


 


	 	(A)	= the VWAP on the Business Day preceding the Exercise Date;


 


	 	(B)	= the Exercise Price of the Warrant; and


 


	 	(X)	= the number of Warrant Shares that would be issuable upon exercise of the Warrant in accordance with the terms of the Warrant if such exercise were by means of a cash exercise rather than a cashless exercise.


 


Upon receipt of an
Election to Purchase for a cashless exercise, the Warrant Agent will promptly deliver a copy of the Election to Purchase to the
Company to confirm the number of Warrant Shares issuable in connection with the cashless exercise. The Company shall calculate
and transmit to the Warrant Agent in a written notice, and the Warrant Agent shall have no duty, responsibility or obligation under
this section to calculate, the number of Warrant Shares issuable in connection with any cashless exercise. The Warrant Agent shall
be entitled to rely conclusively on any such written notice provided by the Company, and the Warrant Agent shall not be liable
for any action taken, suffered or omitted to be taken by it in accordance with such written instructions or pursuant to this Warrant
Agreement.


 


“VWAP”
means, for any date, the price determined by the first of the following clauses that applies: (a) if the Common Stock is then listed
or quoted on NYSE MKT, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market or the New York Stock
Exchange (each, a “Trading Market”), the daily volume weighted average price of the Common Stock for such date (or
the nearest preceding date) on the Trading Market on which the Common Stock is then listed or quoted as reported by Bloomberg L.P.
(based on a Trading Day from 9:30 a.m. (New York City time) to 4:02 p.m. (New York City time)), (b) the volume weighted average
price of the Common Stock for such date (or the nearest preceding date) on the OTC Bulletin Board, (c) if the Common Stock is not
then listed or quoted for trading on the OTC Bulletin Board and if prices for the Common Stock are then reported in the OTC Pink
Market maintained by OTC Markets Group, Inc. (or a similar organization or agency succeeding to its functions of reporting prices),
the most recent bid price per share of the Common Stock so reported, or (d) in all other cases, the fair market value of a share
of Common Stock as determined by an independent appraiser selected in good faith by the holders of a majority in interest of the
Warrants then outstanding and reasonably acceptable to the Company, the fees and expenses of which shall be paid by the Company.


 


3.3.8 Disputes.
In the case of a dispute as to the determination of the Exercise Price or the arithmetic calculation of the Warrant Shares, the
Company shall promptly issue to the registered holder the number of Warrant Shares that are not disputed.


 


4. Adjustments.


 


4.1 Adjustment upon
Subdivision or Combination of Common Stock. If the Company at any time after the Issuance Date subdivides (by any stock split,
stock dividend, recapitalization, reorganization, scheme, arrangement or otherwise) its outstanding shares of Common Stock into
a greater number of shares, the Exercise Price in effect immediately prior to such subdivision will be proportionately reduced
and the number of Warrant Shares will be proportionately increased. If the Company at any time after the Issuance Date combines
(by any stock split, stock dividend, recapitalization, reorganization, scheme, arrangement or otherwise) its outstanding shares
of Common Stock into a smaller number of shares, the Exercise Price in effect immediately prior to such combination will be proportionately
increased and the number of Warrant Shares will be proportionately decreased. Any adjustment under this Section 4.1 shall become
effective at the close of business on the date the subdivision or combination becomes effective. The Company shall promptly notify
Warrant Agent in writing of any adjustment to the Warrants and give specific instructions to the Warrant Agent with respect to
any adjustments to the warrant register.


 




    	 



    	 



    

  


4.2 Adjustment for
Other Distributions. In the event the Company shall fix a record date for the making of a dividend or distribution to all holders
of Common Stock of any evidences of indebtedness or assets or subscription rights or warrants (excluding those referred to in Section
4.1 or other dividends paid out of retained earnings), then in each such case the Holder will, upon the exercise of this Warrant,
be entitled to receive, in addition to the number of shares of Common Stock issuable thereupon, and without payment of any additional
consideration therefor, the amount of such dividend or distribution, as applicable, which such Holder would hold on the date of
such exercise had such Holder been the holder of record of such Common Stock as of the date on which holders of Common Stock received
or became entitled to receive such dividend or distribution. Such adjustment shall be made whenever any such distribution is made
and shall become effective immediately after the record date mentioned above.


 


4.3. Reclassification,
Consolidation, Purchase, Combination, Sale or Conveyance. If, at any time while the Warrants are outstanding, (i) the Company,
directly or indirectly, in one or more related transactions effects any merger or consolidation of the Company with or into another
person, (ii) the Company, directly or indirectly, effects any sale, lease, license, assignment, transfer, conveyance or other disposition
of all or substantially all of its assets in one or a series of related transactions, (iii) any, direct or indirect, purchase offer,
tender offer or exchange offer (whether by the Company or another person) is completed pursuant to which holders of Common Stock
are permitted to sell, tender or exchange their shares for other securities, cash or property and has been accepted by the holders
of 50% or more of the outstanding Common Stock, (iv) the Company, directly or indirectly, in one or more related transactions effects
any reclassification, reorganization or recapitalization of the Common Stock or any compulsory share exchange pursuant to which
the Common Stock is effectively converted into or exchanged for other securities, cash or property, (v) the Company, directly or
indirectly, in one or more related transactions consummates a stock or share purchase agreement or other business combination (including,
without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with another person whereby such other
person acquires more than 50% of the outstanding shares of Common Stock (not including any shares of Common Stock held by the other
person or other persons making or party to, or associated or affiliated with the other persons making or party to, such stock or
share purchase agreement or other business combination) (each a “Fundamental Transaction”), then, upon any subsequent
exercise of a Warrant, the registered holder shall have the right to receive, for each Warrant Share that would have been issuable
upon such exercise immediately prior to the occurrence of such Fundamental Transaction, the number of shares of Common Stock, if
any, of the successor or acquiring corporation or of the Company, if it is the surviving corporation, and any additional consideration
(the “Alternate Consideration”) receivable as a result of such Fundamental Transaction by a holder of the number of
shares of Common Stock for which this Warrant is exercisable immediately prior to such Fundamental Transaction. For purposes of
any such exercise, the determination of the Exercise Price shall be appropriately adjusted to apply to such Alternate Consideration
based on the amount of Alternate Consideration issuable in respect of one share of Common Stock in such Fundamental Transaction,
and the Company shall apportion the Exercise Price among the Alternate Consideration in a reasonable manner reflecting the relative
value of any different components of the Alternate Consideration. If holders of Common Stock are given any choice as to the securities,
cash or property to be received in a Fundamental Transaction, then the registered holder shall be given the same choice as to the
Alternate Consideration it receives upon any exercise of this Warrant following such Fundamental Transaction. The Company shall
cause any successor entity in a Fundamental Transaction in which the Company is not the survivor (the “Successor Entity”)
and for which shareholders received any equity securities of the Successor Entity, to assume in writing all of the obligations
of the Company under this Warrant Agreement in accordance with the provisions of this Section 4.3 pursuant to written agreements
and shall, upon the written request of the registered holder of a Warrant, deliver to the registered holder in exchange for this
Warrant created by this Warrant Agreement a security of the Successor Entity evidenced by a written instrument substantially similar
in form and substance to the Warrant which is exercisable for a corresponding number of shares of capital stock of such Successor
Entity (or its parent entity), if any, plus any Alternate Consideration, receivable as a result of such Fundamental Transaction
by a holder of the number of shares of Common Stock for which the Warrant is exercisable immediately prior to such Fundamental
Transaction, and with an exercise price which applies the exercise price hereunder to such shares of capital stock, if any, plus
any Alternate Consideration (but taking into account the relative value of the shares of Common Stock pursuant to such Fundamental
Transaction and the value of such shares of capital stock, such number of shares of capital stock and such exercise price being
for the purpose of protecting the economic value of such Warrant immediately prior to the consummation of such Fundamental Transaction).
Upon the occurrence of any such Fundamental Transaction the Successor Entity shall succeed to, and be substituted for (so that
from and after the date of such Fundamental Transaction, the provisions of this Warrant Agreement and the Warrant 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 Warrant Agreement and the Warrant with the same effect as if such
Successor Entity had been named as the Company herein.


The Company shall
instruct the Warrant Agent in writing to mail by first class mail, postage prepaid, to each registered holder of a Warrant, written
notice of the execution of any such amendment, supplement or agreement. Any supplemented or amended agreement entered into by the
successor corporation or transferee shall provide for adjustments, which shall be as nearly equivalent as may be practicable to
the adjustments provided for in Section 4. The Warrant Agent shall have no duty, responsibility or obligation to determine the
correctness of any provisions contained in such agreement or such notice, including but not limited to any provisions relating
either to the kind or amount of securities or other property receivable upon exercise of warrants or with respect to the method
employed and provided therein for any adjustments, and shall be entitled to rely conclusively for all purposes upon the provisions
contained in any such agreement. The provisions of this Section 4.3 shall similarly apply to successive reclassifications, changes,
consolidations, mergers, sales and conveyances of the kind described above.


 




    	 



    	 



    

  


4.4 Other Events.
If any event occurs of the type contemplated by the provisions of Section 4.1, 4.2 or 4.3 but not expressly provided for by such
provisions (including, without limitation, the granting of stock appreciation rights, phantom stock rights or other rights with
equity features to all holders of Common Stock for no consideration), then the Company's Board of Directors will, at its discretion
and in good faith, make an adjustment in the Exercise Price and the number of Warrant Shares or designate such additional consideration
to be deemed issuable upon exercise of a Warrant, so as to protect the rights of the registered holder.


 


4.5. Notices of Changes
in Warrant. Upon every adjustment of the Warrant Price or the number of shares issuable upon exercise of a Warrant, the Company
shall give written notice thereof to the Warrant Agent, which notice shall state the Warrant Price resulting from such adjustment
and the increase or decrease, if any, in the number of shares purchasable at such price upon the exercise of a Warrant, setting
forth in reasonable detail the method of calculation and the facts upon which such calculation is based. Upon the occurrence of
any event specified in Sections 4.1 or 4.2, then, in any such event, the Company shall give written notice to each registered holder,
at the last address set forth for such holder in the warrant register, of the record date or the effective date of the event. Failure
to give such notice, or any defect therein, shall not affect the legality or validity of such event. The Warrant Agent shall be
entitled to rely conclusively on, and shall be fully protected in relying on, any certificate, notice or instructions provided
by the Company with respect to any adjustment of the Warrant Price or the number of shares issued able upon exercise of a Warrant,
or any related matter, and the Warrant Agent shall not be liable for any action taken, suffered or omitted to be taken by it in
accordance with any such certificate, notice or instructions or pursuant to this Warrant Agreement. The Warrant Agent shall not
be deemed to have knowledge of any such adjustment unless and until it shall have received written notice thereof from the Company.


 


5. Transfer and
Exchange of Warrants.


 


5.1. Registration
of Transfer. The Warrant Agent shall register the transfer, from time to time, of any outstanding Warrant upon the Warrant
Register, upon surrender of such Warrant for transfer, properly endorsed with signatures properly medallion signature guaranteed
and accompanied by appropriate instructions for transfer, and written confirmation from the Company that such transfer is approved.
Upon any such transfer, a new Warrant representing an equal aggregate number of Warrants shall be issued and the old Warrant shall
be cancelled by the Warrant Agent. The Warrants so cancelled shall be delivered by the Warrant Agent to the Company from time to
time upon request.


 


5.2. Procedure for
Surrender of Warrants. Warrants may be surrendered to the Warrant Agent, together with a written request for exchange or transfer
reasonably acceptable to Warrant Agent, and thereupon the Warrant Agent shall request written confirmation from the Company that
such transfer is approved, and upon receipt of such written confirmation, the Warrant Agent shall issue in exchange therefor one
or more new Warrants as requested by the registered holder of the Warrants so surrendered, representing an equal aggregate number
of Warrants; provided, however, that except as otherwise provided herein, each Warrant may be transferred only in whole and only
to the Depository, to another nominee of the Depository, to a successor depository, or to a nominee of a successor depository;
provided further, however, that in the event that a Warrant surrendered for transfer bears a restrictive legend, the Warrant Agent
shall not cancel such Warrant and issue new Warrants in exchange therefor until the Warrant Agent has received an opinion of counsel
for the Company stating that such transfer may be made and indicating whether the new Warrants must also bear a restrictive legend.


 




    	 



    	 



    

  


5.3. Fractional Warrants.
The Warrant Agent shall not be required to effect any registration of transfer or exchange which will result in the issuance of
a Warrant for a fraction of a Warrant.


 


6. Limitations on
Exercise. The Company shall not, and shall not instruct the Warrant Agent to, effect any exercise of any Warrant, and a registered
holder shall not have the right to exercise any portion of a Warrant, to the extent that after giving effect to the issuance of
shares of Common Stock after exercise as set forth on the applicable Election to Purchase, the registered holder (together with
such registered holder’s Affiliates (as defined in Rule 405 under the Securities Act of 1933), and any other persons acting
as a group together with the registered holder or any of the registered holder’s Affiliates), would beneficially own in excess
of 4.99% of the Company’s Common Stock. For purposes of the foregoing sentence, the number of shares of Common Stock beneficially
owned by the registered holder and its Affiliates shall include the number of shares of Common Stock issuable upon exercise of
the Warrant with respect to which such determination is being made, but shall exclude the number of shares of Common Stock which
would be issuable upon exercise of the remaining, non-exercised portion of any Warrant beneficially owned by the registered holder
or any of its Affiliates. Except as set forth in the preceding sentence, for purposes of this Section 6, beneficial ownership shall
be calculated in accordance with Section 13(d) of the Exchange Act and the rules and regulations promulgated thereunder, it being
acknowledged by the registered holder that neither the Warrant Agent nor the Company is representing to the registered holder that
such calculation is in compliance with Section 13(d) of the Exchange Act and the registered holder is solely responsible for any
schedules required to be filed in accordance therewith. To the extent that the limitation contained in this Section 6 applies,
the determination of whether a Warrant is exercisable (in relation to other securities owned by the registered holder together
with any Affiliates) and of which portion of a Warrant is exercisable shall be in the sole discretion of the registered holder,
and the submission of an Election to Purchase shall be deemed to be the registered holder’s determination of whether such
Warrant is exercisable (in relation to other securities owned by the registered holder together with any Affiliates) and of which
portion of a Warrant is exercisable, and neither the Warrant Agent nor the Company shall have any obligation to verify or confirm
the accuracy of such determination and neither of them shall have any liability for any error made by the registered holder. In
addition, a determination as to any group status as contemplated above shall be determined in accordance with Section 13(d) of
the Exchange Act and the rules and regulations promulgated thereunder. For purposes of this Section 6, in determining the number
of outstanding shares of Common Stock, a registered holder may rely on the number of outstanding shares of Common Stock as reflected
in (A) the Company’s most recent periodic or annual report filed with the Securities and Exchange Commission, as the case
may be, (B) a more recent public announcement by the Company or (C) a more recent written notice by the Company or the Company’s
transfer agent setting forth the number of shares of Common Stock outstanding. The provisions of this Section 6 shall be construed
and implemented in a manner otherwise than in strict conformity with the terms of this Section 6 to correct this subsection (or
any portion hereof) which may be defective or inconsistent with the intended beneficial ownership limitation herein contained or
to make changes or supplements necessary or desirable to properly give effect to such limitation. The limitations contained in
this paragraph shall apply to a successor holder of a Warrant.


 


7. Other Provisions
Relating to Rights of Holders of Warrants.


 


7.1. No Rights as
Stockholder. Except as otherwise specifically provided herein, a registered holder, solely in its capacity as a holder of a
Warrant, shall not be entitled to vote or receive dividends or be deemed the holder of share capital of the Company for any purpose,
nor shall anything contained in this Warrant Agreement be construed to confer upon a registered holder, solely in its capacity
as the registered holder of a Warrant, any of the rights of a stockholder of the Company or any right to vote, give or withhold
consent to any corporate action (whether any reorganization, issue of stock, reclassification of stock, consolidation, merger,
conveyance or otherwise), receive notice of meetings, receive dividends or subscription rights, or otherwise, prior to the issuance
to the registered holder of the Warrant Shares which it is then entitled to receive upon the due exercise of a Warrant. A Warrant
does not entitle the registered holder thereof to any of the rights of a stockholder.


 


7.2. Reservation of
Common Stock. The Company shall at all times reserve and keep available a number of its authorized but unissued shares of Common
Stock that will be sufficient to permit the exercise in full of all outstanding Warrants issued pursuant to this Warrant Agreement.


 




    	 



    	 



    

  


8. Concerning the
Warrant Agent and Other Matters.


 


8.1 Concerning the
Warrant Agent. The Warrant Agent:


 


a)      shall have no duties
or obligations other than those expressly set forth herein and no duties or obligations shall be inferred or implied;


 


b)      may rely on and
shall be held harmless and protected and shall incur no liability for or in respect of any action taken, suffered or omitted to
be taken by it in reliance upon any certificate, statement, instrument, opinion, notice, letter, facsimile transmission, telegram
or other document, or any security delivered to it, and believed by it to be genuine and to have been made or signed by the proper
party or parties, or upon any written or oral instructions or statements from the Company with respect to any matter relating to
its acting as Warrant Agent hereunder;


 


c)      may consult with
counsel satisfactory to it (including counsel for the Company) and the advice or opinion of such counsel shall be full and complete
authorization and protection in respect of any action taken, suffered or omitted to be taken by it in accordance with such advice
or opinion of such counsel;


 


d)      shall be held harmless
by the Company and any other person in respect of any action taken, suffered or omitted to be taken by the Warrant Agent hereunder
in accordance with any determination as to whether or not a Warrant received by the Warrant Agent is duly, completely and correctly
executed;


 


e)      shall not be obligated
to expend or risk its own funds or to take any action that it believes would expose or subject it to expense or liability or to
a risk of incurring expense or liability, unless it has been furnished with assurances of repayment or indemnity satisfactory to
it;


 


f)      shall not be liable
or responsible for any failure of the Company to comply with any of its obligations relating to the Registration Statement or this
Warrant Agreement, including without limitation obligations under applicable regulation or law;


 


g)      and its officers,
directors and employees, may become the owner of, or acquire any interest in, any Warrant, with the same rights that it or they
would have were it not the Warrant Agent hereunder, and, to the extent permitted by applicable law, it or they may engage or be
interested in any financial or other transaction with the Company and may act on, or as a depositary, trustee or agent for, any
committee or body of holders of Warrants, or other securities or obligations of the Company, as freely as if it were not the Warrant
Agent hereunder. Nothing in this Warrant Agreement shall be deemed to prevent the Warrant Agent from acting as trustee under an
indenture;


 


h)      shall not be under
any liability for interest on any monies at any time received by it pursuant to any of the provisions of this Warrant Agreement;


 


i)      shall not be accountable
or under any duty or responsibility for the use by the Company of any Warrants authenticated by the Warrant Agent and delivered
by it to the Company pursuant to this Warrant Agreement or for the application by the Company of the proceeds of the issue and
sale, or exercise, of the Warrants;


 


j)      shall have no duty
or responsibility in case of any default by the Company in the performance of its covenants or agreements contained herein or in
any Warrant or in the case of the receipt of any written demand from any Warrant holder with respect to such default, including,
without limiting the generality of the foregoing, any duty or responsibility to initiate or attempt to initiate any proceedings
at law or otherwise or to make any demand upon the Company;


 


k)      shall not be responsible
for any failure of the Company to comply with any of the covenants contained in this Warrant Agreement or in the Warrants to be
complied with by the Company;


 




    	 



    	 



    

  


l)      may execute any
of the trusts or powers hereunder or perform any duties hereunder either directly or by or through agents or attorneys-in-fact,
and the Warrant Agent shall not be responsible for any loss or expense arising out of, or in connection with, the actions or omissions
to act of its agents or attorneys-in-fact, so long as the Warrant Agent acts without gross negligence or willful misconduct (each
as determined by a final, non-appealable judgment of a court of competent jurisdiction) in connection with the selection of such
agents or attorneys-in-fact; and


 


m)      shall act hereunder
solely as agent for the Company, and its duties shall be determined solely by the provisions hereof. The Warrant Agent shall not
assume any obligations or relationship of agency or trust with any of the owners or holders of the Warrants. The Warrant Agent
shall not be liable for anything which it may do or refrain from doing in connection with this Warrant Agreement except for its
own gross negligence, bad faith or willful misconduct (as each is determined by a final, non-appealable judgment of a court of
competent jurisdiction). The Warrant Agent shall not be liable for any error of judgment made by it, unless it shall be proved
that the Warrant Agent was grossly negligent in ascertaining the pertinent facts (as determined by a final, non-appealable judgment
of a court of competent jurisdiction).


 


8.2      Payment of Taxes.
The Company will from time to time promptly pay all taxes and charges that may be imposed upon the Company or the Warrant Agent
in respect of the issuance or delivery of shares of Common Stock upon the exercise of Warrants, but the Company may require the
Common Stock holders to pay any transfer taxes in respect of the Warrants or such shares. The Warrant Agent may refrain from registering
any transfer or issue or delivery of any Warrant Shares unless or until the persons requesting the registration or issuance shall
have paid to the Warrant Agent for the account of the Company the amount of such tax or charge, if any, or shall have established
to the reasonable satisfaction of the Company and the Warrant Agent that such tax or charge, if any, has been paid.


 


		8.3	Resignation, Consolidation, or Merger of Warrant Agent.



 


8.3.1. Appointment
of Successor Warrant Agent. The Warrant Agent, or any successor to it hereafter appointed, may resign its duties and be discharged
from all further duties and liabilities hereunder after giving thirty (30) days’ notice in writing to the Company, or such
shorter period of time agreed to by the Company. If the office of the Warrant Agent becomes vacant by resignation or incapacity
to act or otherwise, the Company shall appoint in writing a successor Warrant Agent in place of the Warrant Agent. If the Company
shall fail to make such appointment within a period of 30 days after it has been notified in writing of such resignation or incapacity
by the Warrant Agent or by the holder of the Warrant (who shall, with such notice, submit his Warrant for inspection by the Company),
then the Warrant Agent or the holder of any Warrant may apply to the any court of competent jurisdiction for the appointment of
a successor Warrant Agent at the Company’s cost. Pending appointment of a successor to such Warrant Agent, either by the
Company or by such a court, the duties of the Warrant Agent shall be carried out by the Company. Any successor Warrant Agent (but
not including the initial Warrant Agent), whether appointed by the Company or by such court, shall be a person organized and existing
under the laws of any state or of the United States of America, in good standing, and authorized under such laws to exercise shareowner
services powers and subject to supervision or examination by federal or state authority. After appointment, any successor Warrant
Agent shall be vested with all the authority, powers, rights, immunities, duties, and obligations of its predecessor Warrant Agent
with like effect as if originally named as Warrant Agent hereunder, without any further act or deed, and except for executing and
delivering documents as provided in the sentence that follows, the predecessor Warrant Agent shall have no further duties, obligations,
responsibilities or liabilities hereunder, but shall be entitled to all rights that survive the termination of this Warrant Agreement
and the resignation or removal of the Warrant Agent, including but not limited to its right to indemnity hereunder. If for any
reason it becomes necessary or appropriate, the predecessor Warrant Agent shall execute and deliver, at the expense of the Company,
an instrument transferring to such successor Warrant Agent all the authority, powers, and rights of such predecessor Warrant Agent
hereunder; and upon request of any successor Warrant Agent the Company shall make, execute, acknowledge, and deliver any and all
instruments in writing for more fully and effectually vesting in and confirming to such successor Warrant Agent all such authority,
powers, rights, immunities, duties, and obligations.


 


8.2.2. Notice of
Successor Warrant Agent. In the event a successor Warrant Agent shall be appointed, the Company shall give notice thereof to
the predecessor Warrant Agent and the transfer agent for the Common Stock not later than the effective date of any such appointment.


 




    	 



    	 



    

  


8.2.3. Merger or
Consolidation of Warrant Agent. Any person into which the Warrant Agent may be merged or converted or with which it may be
consolidated or any person resulting from any merger, conversion or consolidation to which the Warrant Agent shall be a party or
any person succeeding to the shareowner services business of the Warrant Agent or any successor Warrant Agent shall be the successor
Warrant Agent under this Warrant Agreement, without any further act or deed. For purposes of this Warrant Agreement, “person”
shall mean any individual, firm, corporation, partnership, limited liability company, joint venture, association, trust or other
entity, and shall include any successor (by merger or otherwise) thereof or thereto.


 


8.3. Fees and Expenses
of Warrant Agent.


 


8.3.1. Remuneration.
The Company agrees to pay the Warrant Agent reasonable remuneration in an amount separately agreed to between Company and Warrant
Agent for its services as Warrant Agent hereunder and will reimburse the Warrant Agent upon demand for all expenditures (including
reasonable counsel fees and expenses) that the Warrant Agent may reasonably incur in the preparation, delivery, administration,
execution and amendment of this Warrant Agreement and the exercise and performance of its duties hereunder. The Warrant Agent fees,
including postage and any out-of-pocket and/or per item fees incurred by the Warrant Agent, shall be paid in accordance with the
payment terms and instructions set forth on each invoice provided to the Company by the Warrant Agent. It is understood and agreed
that all services to be performed by Warrant Agent shall cease if full payment for its services has not been received in accordance
with such payment terms and conditions, and said services will not commence thereafter until all payment due has been received
by Warrant Agent.


 


8.3.2. Further Assurances.
The Company agrees to perform, execute, acknowledge, and deliver or cause to be performed, executed, acknowledged, and delivered
all such further and other acts, instruments, and assurances as may reasonably be required by the Warrant Agent for the carrying
out or performing of the provisions of this Warrant Agreement.


 


8.4. Liability of
Warrant Agent.


 


8.4.1. Reliance
on Company Statement. Whenever in the performance of its duties under this Warrant Agreement, the Warrant Agent shall deem
it necessary or desirable that any fact or matter be proved or established by the Company prior to taking or suffering any action
hereunder, such fact or matter may be deemed to be conclusively proved and established by a statement signed by the President of
the Company and delivered to the Warrant Agent, and the Warrant Agent is hereby authorized and directed to apply to such officer
for advice and instructions in connection with its duties and responsibilities hereunder. Such certificate will be full authorization
to the Warrant Agent for any action taken, suffered or omitted to be taken by it in reliance upon such certificate, and the Warrant
Agent will not be liable for any such action taken, suffered or omitted to be taken by it in accordance with any such instructions
or pursuant to the provisions of this Warrant Agreement.


 


8.4.2. Indemnity.
The Warrant Agent shall be liable hereunder only for its own gross negligence, willful misconduct or bad faith (each as determined
by a final, non-appealable judgment of a court of competent jurisdiction). The Company agrees to indemnify the Warrant Agent for,
and to hold it harmless against, any loss, liability, suit, action, proceeding, judgment, claim, settlement, cost or expense (including
reasonable counsel fees and expenses), incurred without gross negligence, willful misconduct or bad faith on the part of the Warrant
Agent (each as determined by a final, non-appealable judgment of a court of competent jurisdiction), for any action taken, suffered
or omitted to be taken by the Warrant Agent in connection with the preparation, delivery, acceptance, administration, execution
and amendment of this Warrant Agreement and the exercise and performance of its duties hereunder, including the costs and expenses
of defending against any claim of liability arising therefrom, directly or indirectly, and the costs and expenses of enforcing
its rights hereunder.


 


8.4.3. Limitation
of Liability. The Warrant Agent’s aggregate liability, if any, during the term of this Warrant Agreement with respect
to, arising from, or arising in connection with this Warrant Agreement, or from all services provided or omitted to be provided
under this Warrant Agreement, whether in contract, or in tort, or otherwise, is limited to, and shall not exceed, the annual amounts
paid or payable hereunder by the Company to Warrant Agent as fees and charges, but not including reimbursable expenses.


 




    	 



    	 



    

  


8.4.4 Disputes.
In the event any question or dispute arises with respect to the proper interpretation of this Warrant Agreement or the Warrant
Agent’s duties hereunder or the rights of the Company or of any holder of a Warrant, the Warrant Agent shall not be required
to act and shall not be held liable or responsible for refusing to act until the question or dispute has been judicially settled
(and the Warrant Agent may, if it deems it advisable, but shall not be obligated to, file a suit in interpleader or for a declaratory
judgment for such purpose) by final judgment rendered by a court of competent jurisdiction, binding on all parties interested in
the matter which is no longer subject to review or appeal, or settled by a written document in form and substance satisfactory
to the Warrant Agent and executed by the Company and each other interested party. In addition, the Warrant Agent may require for
such purpose, but shall not be obligated to require, the execution of such written settlement by all the Warrant holders, as applicable,
and all other parties that may have an interest in the settlement.


 


8.4.5 Exclusions.
The Warrant Agent shall have no responsibility with respect to the validity of this Warrant Agreement or with respect to the validity
of any Warrant; nor shall it be responsible for any breach by the Company of any covenant or condition contained in this Warrant
Agreement or in any Warrant; nor shall it be responsible or have any duty to make any calculation or adjustment, or to determine
when any calculation or adjustment required under the provisions of this Warrant Agreement, including but not limited to Section
4 hereof, should be made, how it should be made or what it should be, or have any responsibility or liability for the manner, method
or amount of any such calculation or adjustment or the ascertaining of the existence of facts that would require any such calculation
or adjustment, including but not limited to any calculation or determination of “fair market value” and any calculation
or determination made in connection with an exercise of Warrants on a “cashless basis;” nor shall it by any act hereunder
be deemed to make any representation or warranty as to the authorization or reservation of any shares of Common Stock to be issued
pursuant to this Warrant Agreement or any Warrant or as to whether any securities will, when issued, be validly authorized and
issued, fully paid, non-assessable and free from all preemptive rights, taxes, liens and charges; nor will the Warrant Agent be
under any duty or responsibility to ensure compliance with any applicable federal or state securities laws in connection with the
issuance, transfer or exchange of Warrants.


 


8.5. Acceptance of
Agency. The Warrant Agent hereby accepts the agency established by this Warrant Agreement and agrees to perform the same upon
the express terms and conditions herein set forth and among other things, shall account promptly to the Company with respect to
Warrants exercised and concurrently account for, and pay to the Company, all moneys received by the Warrant Agent for the purchase
of shares of Common Stock through the exercise of Warrants.


 


9. Miscellaneous
Provisions.


 


9.1. Successors.
All the covenants and provisions of this Warrant Agreement by or for the benefit of the Company or the Warrant Agent shall bind
and inure to the benefit of their respective successors and assigns.


 


9.2. Notices.
Any notice, statement or demand authorized by this Warrant Agreement to be given or made by the Warrant Agent or by the holder
of any Warrant to or on the Company shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by
certified mail or private courier service within five days after deposit of such notice, postage prepaid, addressed (until another
address is filed in writing by the Company with the Warrant Agent), as follows:


 


PlasmaTech Biopharmaceuticals,
Inc.


4848 Lemmon Avenue,
Suite 517


Dallas, TX 75219


Attn: Chief Executive
Officer


 


Any notice, statement
or demand authorized by this Warrant Agreement to be given or made by the holder of any Warrant or by the Company to or on the
Warrant Agent shall be sufficiently given when so delivered if by hand or overnight delivery or if sent by certified mail or private
courier service within five days after deposit of such notice, postage prepaid, addressed (until another address is filed in writing
by the Warrant Agent with the Company), as follows:


 


American Stock Transfer
& Trust Company, LLC


 




    	 



    	 



    

  


6201 15th Avenue


Brooklyn, NY 11219


Attn: Legal Department


 


with a copy in each case to:


 


________________


________________


________________


Attn: _________________


 


9.3. Applicable law.
The validity, interpretation, and performance of this Warrant Agreement and of the Warrants shall be governed in all respects by
the laws of the State of New York, without giving effect to conflicts of law principles that would result in the application of
the substantive laws of another jurisdiction. The Company hereby agrees that any action, proceeding or claim against it arising
out of or relating in any way to this Warrant Agreement may be brought and enforced in the courts of the State of New York or the
United States District Court for the Southern District of New York, and irrevocably submits to such jurisdiction, which jurisdiction
shall be non-exclusive. The Company hereby waives any objection to such non-exclusive jurisdiction and that such courts represent
an inconvenience forum. Any such process or summons to be served upon the Company may be served by transmitting a copy thereof
by registered or certified mail, return receipt requested, postage prepaid, addressed to it at the address set forth in Section
9.2 hereof. Such mailing shall be deemed personal service and shall be legal and binding upon the Company in any action, proceeding
or claim.


 


9.4. Persons Having
Rights under this Warrant Agreement. Nothing in this Warrant Agreement expressed and nothing that may be implied from any of
the provisions hereof is intended, or shall be construed, to confer upon, or give to, any person or corporation other than the
parties hereto, the registered holders of the Warrants, certain indemnitees pursuant to Section 8.4.2, and, for purposes of Sections
3.3, 9.3 and 9.8, the Underwriter, any right, remedy, or claim under or by reason of this Warrant Agreement or of any covenant,
condition, stipulation, promise, or agreement hereof. The Underwriters shall be deemed to be an express third-party beneficiary
of this Warrant Agreement with respect to Sections 3.3, 9.3 and 9.8 hereof. All covenants, conditions, stipulations, promises,
and agreements contained in this Warrant Agreement shall be for the sole and exclusive benefit of the parties hereto (and the Underwriters
with respect to the Sections 3.3, 9.3 and 9.8 hereof and those certain indemnitees pursuant to Section 8.4.2) and their successors
and assigns and of the registered holders of the Warrants.


 


9.5. Examination of
the Warrant Agreement. A copy of this Warrant Agreement shall be available at all reasonable times at the office of the Warrant
Agent designated for such purpose for inspection by the registered holder of any Warrant. Prior to such inspection, the Warrant
Agent may require any such holder to submit his Warrant for inspection by it.


 


9.6. Counterparts.
This Warrant Agreement may be executed in any number of original, facsimile or electronic counterparts and each of such counterparts
shall for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument.


 


9.7. Effect of Headings.
The Section headings herein are for convenience only and are not part of this Warrant Agreement and shall not affect the interpretation
thereof.


 


9.8 Amendments.
This Warrant Agreement may be amended by the parties hereto without the consent of any registered holder for the purpose of curing
any ambiguity, or of curing, correcting or supplementing any defective provision contained herein or adding or changing any other
provisions with respect to matters or questions arising under this Warrant Agreement as the parties may deem necessary or desirable
and that the parties deem shall not adversely affect the interest of the registered holders. All other modifications or amendments,
including any amendment to increase the Warrant Price or shorten the Exercise Period, shall require the written consent of the
Underwriter and the registered holders of a majority of the then outstanding Warrants.


 




    	 



    	 



    

  


9.9      Severability.
This Warrant Agreement shall be deemed severable, and the invalidity or unenforceability of any term or provision hereof shall
not affect the validity or enforceability of this Warrant Agreement or of any other term or provision hereof; provided, that if
such invalid or unenforceable term affects the rights, duties, obligations or liabilities of the Warrant Agent, the Warrant Agent
shall be entitled to resign immediately. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties
hereto intend that there shall be added as a part of this Warrant Agreement a provision as similar in terms to such invalid or
unenforceable provision as may be possible and be valid and enforceable.


 


9.10      Force Majeure.
In the event either party is unable to perform its obligations under the terms of this Warrant Agreement because of acts of
God, strikes, failure of carrier or utilities, equipment or transmission failure or damage that is reasonably beyond its control,
or any other cause that is reasonably beyond its control, such party shall not be liable for damages to the other for any damages
resulting from such failure to perform or otherwise from such causes. Performance under this Warrant Agreement shall resume when
the affected party or parties are able to perform substantially that party’s duties; provided, that in no event shall this
provision relieve the Company of its indemnification obligations hereunder.


 


9.11      Consequential
Damages. Notwithstanding anything in this Warrant Agreement to the contrary, except for indemnification of third party
claims by the Company pursuant to Section 8.4.2, neither party to this Warrant Agreement shall be liable to the other party for
any consequential, indirect, punitive, special or incidental damages of any kind whatsoever (including but not limited to lost
profits), even if that party has been advised of or has foreseen the likelihood of such losses or damages and regardless of the
form of action.


 


9.12      Customer Identification
Program. The Company acknowledges that the Warrant Agent is subject to the customer identification program (“Customer
Identification Program”) requirements under the USA PATRIOT Act and its implementing regulations, and that the Warrant Agent
must obtain, verify and record information that allows the Warrant Agent to identify the Company. Accordingly, prior to accepting
an appointment hereunder, the Warrant Agent may request information from the Company that will help the Warrant Agent to identify
the Company, including without limitation the Company’s physical address, tax identification number, organizational documents,
certificate of good standing, license to do business, or any other information that the Warrant Agent deems necessary. The Company
agrees that the Warrant Agent cannot accept an appointment hereunder unless and until the Warrant Agent verifies the Company’s
identity in accordance with the Customer Identification Program requirements.


 


IN WITNESS WHEREOF,
this Warrant Agreement has been duly executed by the parties hereto as of the day and year first above written.


 


PLASMATECH BIOPHARMACEUTICALS, INC.


 


	By: 	 	 
	Name: Scott Shorer	 
	Title: Chief Executive Officer	 
	 	 
	AMERICAN STOCK TRANSFER & TRUST COMPANY, LLC	 
	 	 
	By: 	 	 
	Name:	 	 
	Title: