Document:

June
8, 2017

 

VIA
ELECTRONIC MAIL

 

Re:
Agreement to Convert – Series D Preferred Stock;

Receipt
of Warrant;

 

Dear:

 

Reference
is made to the 75 shares of Series D Preferred Stock (the “Preferred Stock”) issued by Pressure BioSciences, Inc.
(the “Company”) to you in November 2011. The Company expects to undertake a 1 for 30 reverse stock split on Monday,
June 5, 2017. Unless the context otherwise requires, all of the numbers reflected herein are represented on a pre-reverse stock
split basis.

 

Our
Current Financing

 

As
you may be aware, the Company is currently in the process of pursuing a public offering of its securities to raise up to $12,500,000
and list its securities onto the NASDAQ Stock Market (the “Offering”). The Company has filed a registration statement
on Form S-1 related to the Offering which is being led by Joseph Gunnar & Co (the “Underwriter”). The registration
statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective.
These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective.
A copy of the preliminary offering prospectus and registration statement related to the Offering can be found at www.sec.gov
and may be obtained by writing to the Company at the address below, attention: CEO. The Company believes that attaining and
maintaining the listing of our shares of common stock, par value $0.01 per share (the “Common Stock”), on the NASDAQ
Stock Market is in the best interests of our Company and its stockholders. The Company is therefore contacting you and other holders
of debt and preferred stock to request that holders convert their Preferred Stock into Common Stock.

 

 

What
We Need From You

By
executing and delivering this letter, you hereby agree:

 

	 	I.	That
    on May 10, 2017 you converted 75 shares of Preferred Stock into 187,500 restricted shares of Common Stock.
	 	 	 
	 	II.	That
    upon the conversion of the 75 shares of Preferred Stock into 187,500 restricted shares of Common Stock, PBI agreed to issue
    you an additional 112,500 restricted shares of Common Stock and a new warrant (the “New Warrant”) to purchase
    298,328 shares of Common Stock of the Company with $0.28 exercise price. The terms of the New Warrant will be substantially
    similar to the warrants being included in the Offering, except such New Warrants will have a $0.28 exercise price, will be
    restricted securities, and will not trade on NASDAQ. For the sake of clarity, you understand that the New Warrants will not
    contain a “Subsequent Equity Sales” provision that lowers the exercise price of the New Warrants upon any future
    dilutive issuance of shares of Common Stock.

 

 

 

    	 	 	 

    	 	 	 

    

 

Upon
the triggering of Automatic Conversion, the Company shall send you: (i) prompt written notice (the “Automatic Conversion
Notice”) specifying the date upon which such conversion was effective (the “Effective Date”); and (ii) the New
Warrants. The Automatic Conversion Notice will also contain instructions on surrendering to the Company your original Preferred
Stock certificates; provided, however, the Automatic Conversion shall be effective on the Effective Date whether or not you surrender
the Preferred Stock certificates, which shall be null and void on the Effective Date.

 

By
executing and delivering this letter, you hereby also agree to the following lock-up conditions:

 

	 	a.	That
    for a period of 90 days beginning on the Effective Date (the “Lock-Up Period”), you will not, without the prior
    written consent of the Underwriter, (1) offer, pledge, sell, contract to sell, grant, lend, or otherwise transfer or dispose
    of, directly or indirectly, any shares of the Common Stock you currently own or will own including those hereafter acquired
    by you or with respect to which you hereafter acquire the power of disposition (collectively, the “Lock-Up Securities”);
    (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences
    of ownership of the Lock-Up Securities, whether any such transaction described in clause (1) above or this clause (2) is to
    be settled by delivery of Lock-Up Securities, in cash or otherwise; (3) make any demand for or exercise any right with respect
    to the registration of any Lock-Up Securities; or (4) publicly disclose the intention to make any offer, sale, pledge or disposition,
    or to enter into any transaction, swap, hedge or other arrangement relating to any Lock-Up Securities. Notwithstanding the
    foregoing, and subject to the conditions below, you may transfer Lock-Up Securities without the prior written consent of the
    Underwriter in connection with (a) transfers of Lock-Up Securities as a bona fide gift, by will or intestacy or to a family
    member or trust for the benefit of a family member (for purposes of this Letter Agreement, “family member” means
    any relationship by blood, marriage or adoption, not more remote than first cousin); (b) transfers of Lock-Up Securities to
    a charity or educational institution; (c) transfers of Lock-Up Securities pursuant to a bona fide third party tender offer
    made to all holders of the Common Stock, merger, consolidation or other similar transaction involving a change of control
    (as defined below) of the Company, including voting in favor of any such transaction or taking any other action in connection
    with such transaction, provided that in the event that such merger, tender offer or other transaction is not completed, the
    Lock-Up Securities shall remain subject to the restrictions set forth herein; or (d) transfers of Lock-Up Securities in the
    case of a “forced conversion” by the Company. In the case of any transfer pursuant to the foregoing clauses (a)
    or (b), (i) any such transfer shall not involve a disposition for value, (ii) each transferee shall sign and deliver to the
    Underwriter a lock up agreement substantially in the form of the lock-up provisions of this Letter Agreement and (iii) no
    filing under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) shall be required
    or shall be voluntarily made. You also agree and consent to the entry of stop transfer instructions with the Company’s
    transfer agent and registrar against the transfer of your Lock-Up Securities except in compliance with the lock-up provisions
    of this Letter Agreement. For purposes of clause (d) above, “change of control” shall mean the consummation of
    any bona fide third party tender offer, merger, purchase, consolidation or other similar transaction the result of which is
    that any “person” (as defined in Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the “Exchange
    Act”)), or group of persons, becomes the beneficial owner (as defined in Rules 13d-3 and 13d-5 of the Exchange Act)
    of a majority of total voting power of the voting stock of the Company. 

 

 

 

    	 	 	 

    	 	 	 

    

 

	 	b.	If
    (i) during the last 17 days of the Lock-Up Period, the Company issues an earnings release or material news or a material event
    relating to the Company occurs, or (ii) prior to the expiration of the Lock-Up Period, the Company announces that it will
    release earnings results or becomes aware that material news or a material event will occur during the 16-day period beginning
    on the last day of the Lock-Up Period, the restrictions imposed by the lock-up provisions of this Letter Agreement shall continue
    to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of
    such material news or material event, as applicable, unless the Underwriter waives, in writing, such extension.
	 	 	 
	 	c.	You
    agree that, prior to engaging in any transaction or taking any other action that is subject to the terms of the lock-up provisions
    of this Letter Agreement during the initial Lock-Up Period and including the 34th day following the expiration
    of the initial Lock-Up Period, you will give notice thereof to the Company and will not consummate any such transaction or
    take any such action unless you have received written confirmation from the Company that the Lock-Up Period (as may have been
    extended pursuant to the previous paragraph) has expired. 
	 	 	 
	 	d.	No
    portion of the lock-up provisions of this Letter Agreement shall be deemed to restrict or prohibit the exercise, exchange
    or conversion by you of any securities exercisable or exchangeable for or convertible into the Lock-Up Securities, as applicable;
    provided that you do not transfer the Lock-Up Securities acquired on such exercise, exchange or conversion during the Lock-Up
    Period, unless otherwise permitted pursuant to the terms of the lock-up provisions of this Letter Agreement. In addition,
    no provision herein shall be deemed to restrict or prohibit the entry into or modification of a so-called “10b5-1”
    plan at any time (other than the entry into or modification of such a plan in such a manner as to cause the sale of any Lock-Up
    Securities within the Lock-Up Period).
	 	 	 
	 	e.	You
    understand that the lock-up provisions of this Letter Agreement are irrevocable and shall be binding upon your heirs, legal
    representatives, successors and assigns.

 

 

 

    	 	 	 

    	 	 	 

    

 

By
your agreement and acknowledgment below, this Letter Agreement shall serve as written confirmation that:

 

	 	1.	You
    agree to the terms of the Automatic Conversion and the New Warrants.
	 	 	 
	 	2.	Upon
    the date of the Automatic Conversion, the New Warrants shall be deemed issued as described herein irrespective of your physical
    receipt of same. 
	 	 	 
	 	3.	You
    acknowledge and agree that upon the Automatic Conversion the Preferred Stock shall be cancelled. 

 

By
signing below, this Letter Agreement shall serve as written confirmation that you have reviewed this Letter Agreement (and consulted
with your legal and tax advisors to the extent you deemed necessary) and agree to the terms and conditions of the Automatic Conversion
and the New Warrants as described herein. Upon the Effective Date of such conversion, you understand that you will be releasing
and discharging the Company and its affiliates from any and all obligations and duties that such persons may have to you with
respect to Preferred Stock. Notwithstanding anything contained herein, in the event the Offering is not consummated on or before
December 31, 2017, this Letter Agreement will terminate and shall be of no further force and effect.

 

This
Letter Agreement contains the entire understanding between and among the parties and supersedes any prior understandings and agreements
among them respecting the subject matter of this Letter Agreement. In addition, you hereby represent that you meet the requirements
of at least one of the suitability standards for an “accredited investor” as that term is defined in Regulation D
promulgated under the Securities Act of 1933, as amended and that you have had the opportunity to obtain any additional information,
to the extent the Company has such information in its possession or could acquire it without unreasonable effort or expense, necessary
in connection with the matters set forth in this Letter Agreement including, without limitation, information concerning the financial
condition, results of operations, capitalization and business of the Company deemed relevant by you or your advisors, if any,
and all such requested information, to the extent the Company had such information in its possession or could acquire it without
unreasonable effort or expense, has been provided to your full satisfaction. This Letter Agreement shall be governed by and construed
in accordance with the laws of the Commonwealth of Massachusetts without regard to choice of law principles. This Letter Agreement
may be executed in any number of counterparts, each of which shall be an original but all of which together shall constitute one
and the same instrument. In case any provision of this Letter Agreement shall be held to be invalid, illegal or unenforceable,
such provision shall be severable from the rest of this Letter Agreement, and the validity legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

 

 

 

    	 	 	 

    	 	 	 

    

 

This
letter evidences waiver by the undersigned with respect to any and all defaults or events of default by the Company with respect
to any failure by the Company to comply with any covenants contained in the Preferred Stock or the transaction documents signed
in connection with the issuance thereof.

 

The
parties hereby consent and agree that if this Letter Agreement shall at any time be deemed by the parties for any reason insufficient,
in whole or in part, to carry out the true intent and spirit hereof or thereof, the parties will execute or cause to be executed
such other and further assurances and documents as in the reasonable opinion of the parties may be reasonably required in order
more effectively to accomplish the purposes of this Letter Agreement.

 

***REMAINDER
OF PAGE INTENTIONALLY LEFT BLANK***

 

 

 

    	 	 	 

    	 	 	 

    

 

Please
indicate confirmation of the terms provided herein by executing and returning this letter in the space provided below.

 

	 	Very
    truly yours, 
	 	 
	 	PRESSURE
    BIOSCIENCES, INC.
	 	 
	 	By:
    	 
	 	Name:	Richard
    T. Schumacher
	 	Title:	Chief
    Executive Officer
	 	 	 
	 	Date:	____________,
    2017

 

	ACCEPTED
    AND AGREED:	 
	 	 
	INVESTOR	 
	 	 
	 	 
	Date:
    ____________, 2017VIA
ELECTRONIC MAIL

 

Re:
Agreement to Amend Conversion Price and Convert – Debentures;

Agreement
to Amend Debenture Warrants

 

Dear
Investor:

 

Reference
is made to that certain Subscription Agreement (the “Subscription Agreement”), entered into between July 22, 2015
and March 31, 2016 by and among Pressure BioSciences, Inc. (the “Company”) and the holders of the Company’s
Senior Secured Convertible Debentures (the “Debenture Holders”); and those certain Senior Secured Convertible Debentures
(each a “Debenture” and, together, the “Debentures”) and Common Stock Purchase Warrants issued in connection
therewith (the “Debenture Warrants” and, together with the Subscription Agreement and Debentures, the “Debenture
Documents”). You are being sent this letter as you are currently the holder of: (i) a Debenture pursuant to which you are
owed principal along with accrued interest (the “Debenture Obligation”); and (ii) Debenture Warrants. The Company
expects to undertake a 1 for 30 reverse stock split on Monday, June 5, 2017. Unless the context otherwise requires, all of the
numbers reflected herein are represented on a pre-reverse stock split basis.

 

Our
Current Financing

 

As
you may be aware, the Company is currently in the process of pursuing a public offering of its securities to raise up to $12,500,000
and list its securities onto the NASDAQ Stock Market (the “Offering”). The Company has filed a registration statement
on Form S-1 related to the Offering which is being led by Joseph Gunnar & Co (the “Underwriter”). The Company
believes that attaining and maintaining the listing of our shares of common stock, par value $0.01 per share (the “Common
Stock”), on the NASDAQ Stock Market is in the best interests of our Company and its stockholders. The Company is therefore
contacting you and other holders of debt and preferred stock to request that holders convert their Debentures into Common Stock
and amend their Debenture Warrants. A copy of the preliminary offering prospectus and registration statement related to the Offering
can be found at www.sec.gov.

 

What
We Need From You

 

By
executing and delivering this letter, you hereby agree:

 

	 	I.	To
    automatically convert upon closing of the Offering (the “Automatic Conversion”) the Debenture Obligation into
    restricted shares of Common Stock at a conversion price equal to the lower of $0.28 and the price per share of Common Stock
    paid by investors in the Offering (the “Conversion Price”).
	 	 	 
	 	II.	That
    upon triggering the Automatic Conversion, your Debenture Warrants will be amended via a one page amendment in the form attached
    hereto as Exhibit A (the “Amended Warrants”). The Amended Warrants shall have the same exercise price as
    the warrants being included in the Offering and will not contain a “Subsequent Equity Sales” provision that lowers
    the exercise price of the Amended Warrants upon any future dilutive issuance of shares of Common Stock.

 

 

    	 	 	 

    	 

    

 

Upon
the triggering of Automatic Conversion, the Company shall send you: (i) prompt written notice (the “Automatic Conversion
Notice”) specifying the Conversion Price and date upon which such conversion was effective (the “Effective Date”)
and the number of shares of Common Stock to be issued to you; and (ii) the Amended Warrant. The Automatic Conversion Notice will
also contain instructions on surrendering to the Company your original Debenture; provided, however, the Automatic Conversion
shall be effective on the Effective Date whether or not you surrender the Debenture, which shall be null and void on the Effective
Date. 

 

By
executing and delivering this letter, you hereby also agree to the following lock-up conditions:

 

	 	a.	That
    for a period of 90 days beginning on the Effective Date (the “Lock-Up Period”), you will not, without the prior
    written consent of the Underwriter, (1) offer, pledge, sell, contract to sell, grant, lend, or otherwise transfer or dispose
    of, directly or indirectly, any shares of the Common Stock you currently own (with the exception of [_____] shares of unrestricted
    Common Stock you own as of the date of your signature on this Letter Agreement due to issuances by the Company of interest
    earned on the Debenture in the form of “payment in kind” shares of Common Stock. Such shares shall not be considered
    Lock-Up Securities) or will own including those hereafter acquired by you or with respect to which you hereafter acquire the
    power of disposition (collectively, the “Lock-Up Securities”); (2) enter into any swap or other arrangement that
    transfers to another, in whole or in part, any of the economic consequences of ownership of the Lock-Up Securities, whether
    any such transaction described in clause (1) above or this clause (2) is to be settled by delivery of Lock-Up Securities,
    in cash or otherwise; (3) make any demand for or exercise any right with respect to the registration of any Lock-Up Securities;
    or (4) publicly disclose the intention to make any offer, sale, pledge or disposition, or to enter into any transaction, swap,
    hedge or other arrangement relating to any Lock-Up Securities. Notwithstanding the foregoing, and subject to the conditions
    below, you may transfer Lock-Up Securities without the prior written consent of the Underwriter in connection with (a) transfers
    of Lock-Up Securities as a bona fide gift, by will or intestacy or to a family member or trust for the benefit of a family
    member (for purposes of this Letter Agreement, “family member” means any relationship by blood, marriage or adoption,
    not more remote than first cousin); (b) transfers of Lock-Up Securities to a charity or educational institution; (c) transfers
    of Lock-Up Securities pursuant to a bona fide third party tender offer made to all holders of the Common Stock, merger, consolidation
    or other similar transaction involving a change of control (as defined below) of the Company, including voting in favor of
    any such transaction or taking any other action in connection with such transaction, provided that in the event that such
    merger, tender offer or other transaction is not completed, the Lock-Up Securities shall remain subject to the restrictions
    set forth herein; or (d) transfers of Lock-Up Securities in the case of a “forced conversion” by the Company.
    In the case of any transfer pursuant to the foregoing clauses (a) or (b), (i) any such transfer shall not involve a disposition
    for value, (ii) each transferee shall sign and deliver to the Underwriter a lock up agreement substantially in the form of
    the lock-up provisions of this Letter Agreement and (iii) no filing under Section 16(a) of the Securities Exchange Act of
    1934, as amended (the “Exchange Act”) shall be required or shall be voluntarily made. You also agree and consent
    to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of your
    Lock-Up Securities except in compliance with the lock-up provisions of this Letter Agreement. For purposes of clause (d) above,
    “change of control” shall mean the consummation of any bona fide third party tender offer, merger, purchase, consolidation
    or other similar transaction the result of which is that any “person” (as defined in Section 13(d)(3) of the Securities
    Exchange Act of 1934, as amended (the “Exchange Act”)), or group of persons, becomes the beneficial owner (as
    defined in Rules 13d-3 and 13d-5 of the Exchange Act) of a majority of total voting power of the voting stock of the Company.
    

 

 

    	 	 	 

    	 

    

 

	 	b.	If
    (i) during the last 17 days of the Lock-Up Period, the Company issues an earnings release or material news or a material event
    relating to the Company occurs, or (ii) prior to the expiration of the Lock-Up Period, the Company announces that it will
    release earnings results or becomes aware that material news or a material event will occur during the 16-day period beginning
    on the last day of the Lock-Up Period, the restrictions imposed by the lock-up provisions of this Letter Agreement shall continue
    to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the occurrence of
    such material news or material event, as applicable, unless the Underwriter waives, in writing, such extension.
	 	 	 
	 	c.	You
    agree that, prior to engaging in any transaction or taking any other action that is subject to the terms of the lock-up provisions
    of this Letter Agreement during the initial Lock-Up Period and including the 34th day following the expiration
    of the initial Lock-Up Period, you will give notice thereof to the Company and will not consummate any such transaction or
    take any such action unless you have received written confirmation from the Company that the Lock-Up Period (as may have been
    extended pursuant to the previous paragraph) has expired. 

 

 

 

    	 	 	 

    	 

    

 

	 	d.	No
    portion of the lock-up provisions of this Letter Agreement shall be deemed to restrict or prohibit the exercise, exchange
    or conversion by you of any securities exercisable or exchangeable for or convertible into the Lock-Up Securities, as applicable;
    provided that you do not transfer the Lock-Up Securities acquired on such exercise, exchange or conversion during the Lock-Up
    Period, unless otherwise permitted pursuant to the terms of the lock-up provisions of this Letter Agreement. In addition,
    no provision herein shall be deemed to restrict or prohibit the entry into or modification of a so-called “10b5-1”
    plan at any time (other than the entry into or modification of such a plan in such a manner as to cause the sale of any Lock-Up
    Securities within the Lock-Up Period).
	 	 	 
	 	e.	You
    understand that the lock-up provisions of this Letter Agreement are irrevocable and shall be binding upon your heirs, legal
    representatives, successors and assigns.

 

By
your agreement and acknowledgment below, this Letter Agreement shall serve as written confirmation that:

 

	 	1.	You
    agree to the terms of the Automatic Conversion and the Amended Warrants.
	 	 	 
	 	2.	Upon
    the date of the Automatic Conversion, the Amended Warrants shall be deemed issued as described herein irrespective of your
    physical receipt of same. 
	 	 	 
	 	3.	You
    acknowledge and agree that upon the Automatic Conversion the Debentures shall be cancelled. 
	 	 	 
	 	4.	The
    Company agrees that until such time as (i) twelve (12) months after the closing of the Offering in the event that the Company
    raises at least $11,000,000 by virtue of the sale of Common Stock and Warrants or (ii) ten (10) months after the closing of
    the Offering in the event that the Company raises less than $11,000,000 by virtue of the sale of the Company’s Common
    Stock and Warrants; the Company shall not issue or sell Common Stock, or grant any option to purchase, or sell or grant any
    right to reprice, or otherwise dispose of or issue (or announce any offer, sale, grant or any option to purchase or other
    disposition) any Common Stock (including pursuant to the terms of any outstanding securities issued prior to the date hereof
    (including, but not limited to, warrants, convertible notes, or other agreements) or any security entitling the holder thereof
    to acquire Common Stock, including, without limitation, any debt, preferred stock, right, option, warrant or other instrument
    that is convertible into or exercisable or exchangeable for, or otherwise entitles the holder thereof to receive Common Stock
    (a “Common Stock Equivalent”) at an effective price per share less than price per share of Common Stock sold in
    the Offering without the prior written consent of the Debenture Holders who hold at least 80% of the shares represented by
    the as-converted Debentures as of May 30, 2017, which such consent shall not be unreasonably withheld; provided however, that
    such issuances will not apply to Excepted Issuances. Excepted Issuance means (i) the Company’s issuance of Common Stock
    in full or partial consideration in connection with a strategic merger, acquisition, consolidation or purchase of substantially
    all of the securities or assets of a corporation or other entity, so long as such issuances are not for the purpose of raising
    capital, (ii) the Company’s issuances of Common Stock or the issuances or grants of Options to purchase Common Stock
    to employees, directors, and consultants, pursuant to the Company’s stock option plan at or above Fair Market Value,
    or (iii) securities upon the exercise or exchange of or conversion of any securities exercisable or exchangeable for or convertible
    into shares of Common Stock issued and outstanding on the date hereof.

 

 

 

    	 	 	 

    	 

    

 

By
signing below, this Letter Agreement shall serve as written confirmation that you have reviewed this Letter Agreement (and consulted
with your legal and tax advisors to the extent you deemed necessary) and agree to the terms and conditions of the Automatic Conversion
and the Amended Warrants as described herein. Upon the Effective Date of such conversion, you understand that you will be releasing
and discharging the Company and its affiliates from any and all obligations and duties that such persons may have to you with
respect to the Debenture Documents. Notwithstanding anything contained herein, in the event the Offering is not consummated on
or before December 31, 2017, this Letter Agreement will terminate and shall be of no further force and effect.

 

This
Letter Agreement contains the entire understanding between and among the parties and supersedes any prior understandings and agreements
among them respecting the subject matter of this Letter Agreement. In addition, you hereby represent that you meet the requirements
of at least one of the suitability standards for an “accredited investor” as that term is defined in Regulation D
promulgated under the Securities Act of 1933, as amended and that you have had the opportunity to obtain any additional information,
to the extent the Company has such information in its possession or could acquire it without unreasonable effort or expense, necessary
in connection with the matters set forth in this Letter Agreement including, without limitation, information concerning the financial
condition, results of operations, capitalization and business of the Company deemed relevant by you or your advisors, if any,
and all such requested information, to the extent the Company had such information in its possession or could acquire it without
unreasonable effort or expense, has been provided to your full satisfaction. This Letter Agreement shall be governed by and construed
in accordance with the laws of the Commonwealth of Massachusetts without regard to choice of law principles. This Letter Agreement
may be executed in any number of counterparts, each of which shall be an original but all of which together shall constitute one
and the same instrument. In case any provision of this Letter Agreement shall be held to be invalid, illegal or unenforceable,
such provision shall be severable from the rest of this Letter Agreement, and the validity legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

 

This
letter evidences waiver by the undersigned with respect to any and all defaults or events of default by the Company with respect
to any failure by the Company to comply with any covenants contained in the Debenture Documents.

 

The
parties hereby consent and agree that if this Letter Agreement shall at any time be deemed by the parties for any reason insufficient,
in whole or in part, to carry out the true intent and spirit hereof or thereof, the parties will execute or cause to be executed
such other and further assurances and documents as in the reasonable opinion of the parties may be reasonably required in order
more effectively to accomplish the purposes of this Letter Agreement.

 

***REMAINDER
OF PAGE INTENTIONALLY LEFT BLANK***

 

 

 

    	 	 	 

    	 

    

 

Please
indicate confirmation of the terms provided herein by executing and returning this letter in the space provided below.

 

	 	Very
    truly yours,
	 	 
	 	PRESSURE
    BIOSCIENCES, INC.
	 	 	 
	 	By:
    	
	 	Name:	Richard
    T. Schumacher
	 	Title:	Chief
    Executive Officer
	 	 	 
	 	Date:	____________,
    2017

 

	ACCEPTED
    AND AGREED:	 
	 	 
	[investor
    name]	 
	 	 
	 	 
	 	 
	Date:
    ____________, 2017	 

 

 

 

    	 	 	 

    	 

    

 

EXHIBIT
A

 

Form
of Amendment to Debenture Warrant

 

FIRST
AMENDMENT TO

COMMON
STOCK PURCHASE WARRANT

 

This
First Amendment (the “Amendment”) to Common Stock Purchase Warrant (the “Warrant”), is made
and entered into effective as of [ ] [ ], 2017 (the “Effective Date”), by and between Pressure BioSciences,
Inc., a Massachusetts corporation (the “Company”), and the undersigned (the “Holder”). Capitalized
terms used but not otherwise defined herein shall have the same meanings as set forth in the Warrant.

 

WHEREAS,
in connection with the Company’s conducting a registered offering of its securities via the filing of a Registration Statement
on Form S-1, as amended (the “Offering”), the Company and the Holder desire to amend the Warrant as set forth
herein.

 

NOW,
THEREFORE, in consideration of the mutual covenants and conditions contained herein, the parties hereby agree as follows:

 

1.
Exercise Price. Section 2(b) of the Warrant is hereby amended and restated in its entirety as follows:

 

“Exercise
Price. The exercise price per share of the Common Stock under this Warrant shall be $[exercise price of the warrants being
included in the Offering to be inserted], subject to adjustment hereunder (the “Exercise Price”).”

 

2. Anti-Dilution.
Any provision in the Warrant relating to the anti-dilution feature, including but not limited to Section 3(b) of the
Warrant, is deleted in its entirety and replaced with the following: “[RESERVED]”.

 

3. Necessary
Acts. Each party to this Amendment hereby agrees to perform any further acts and to execute and deliver any
further documents that may be necessary or required to carry out the intent and provisions of this Amendment and the
transactions contemplated hereby.

 

4. Continued
Validity. Except as otherwise expressly provided herein, the Warrant shall remain in full force and effect.

 

5. Approval
of Amendment; No Execution Required. By Company’s previous execution and by Holder’s previous execution
and delivery of a Letter Agreement regarding “Agreement to Convert – Debentures”, each of the Company and
the Holder shall be deemed to have authorized, approved and executed this Amendment.

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