Exhibit 4.1 


 


COMMON
STOCK PURCHASE WARRANT


 


pulmatrix,
inc.


 


	Warrant
    Shares: ______	Initial
    Exercise Date: June 17, 2022
	 	Issue
    Date: December 17, 2021


 


THIS
COMMON STOCK PURCHASE WARRANT (the “Warrant”) certifies that, for value received, ________or its assigns (the “Holder”)
is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or after
June 17, 2022 (the “Initial Exercise Date”) and on or prior to 5:00 p.m. (New York City time) on December 17, 2026
(the “Termination Date”) but not thereafter, to subscribe for and purchase from Pulmatrix, Inc., a Delaware corporation
(the “Company”), up to ______ shares (as subject to adjustment hereunder, the “Warrant Shares”)
of Common Stock. The purchase price of one share of Common Stock under this Warrant shall be equal to the Exercise Price, as defined
in Section 2(b).


 


Section
1. Definitions. Capitalized terms used and not otherwise defined herein shall have the meanings set forth in that certain
Securities Purchase Agreement (the “Purchase Agreement”), dated December 15, 2021, among the Company and the
purchasers signatory thereto.


 


Section
2. Exercise.


 


a) Exercise
of Warrant. Exercise of the purchase rights represented by this Warrant may be made, in whole or in part, at any time or times
on or after the Initial Exercise Date and on or before the Termination Date by delivery to the Company of a duly executed facsimile
copy or PDF copy submitted by e-mail (or e-mail attachment) of the Notice of Exercise in the form annexed hereto (the
“Notice of Exercise”). Within the earlier of (i) two (2) Trading Days and (ii) the number of Trading Days
comprising the Standard Settlement Period (as defined in Section 2(d)(i) herein) following the date of exercise as aforesaid, the
Holder shall deliver the aggregate Exercise Price for the shares specified in the applicable Notice of Exercise by wire transfer or
cashier’s check drawn on a United States bank unless the cashless exercise procedure specified in Section 2(c) below is
specified in the applicable Notice of Exercise. No ink-original Notice of Exercise shall be required, nor shall any medallion
guarantee (or other type of guarantee or notarization) of any Notice of Exercise be required. Notwithstanding anything herein to the
contrary, the Holder shall not be required to physically surrender this Warrant to the Company until the Holder has purchased all of
the Warrant Shares available hereunder and the Warrant has been exercised in full, in which case, the Holder shall surrender this
Warrant to the Company for cancellation within three (3) Trading Days of the date on which the final Notice of Exercise is delivered
to the Company. Partial exercises of this Warrant resulting in purchases of a portion of the total number of Warrant Shares
available hereunder shall have the effect of lowering the outstanding number of Warrant Shares purchasable hereunder in an amount
equal to the applicable number of Warrant Shares purchased. The Holder and the Company shall maintain records showing the number of
Warrant Shares purchased and the date of such purchases. The Company shall deliver any objection to any Notice of Exercise within
one (1) Business Day of receipt of such notice. The Holder and any assignee, by acceptance of this Warrant, acknowledge and agree
that, by reason of the provisions of this paragraph, following the purchase of a portion of the Warrant Shares hereunder, the number
of Warrant Shares available for purchase hereunder at any given time may be less than the amount stated on the face
hereof.


 




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b) Exercise
Price. The exercise price per share of Common Stock under this Warrant shall be $0.70, subject to adjustment hereunder
(the “Exercise Price”).


 


c) Cashless
Exercise. If at the time of exercise hereof there is no effective registration statement registering, or the prospectus
contained therein is not available for the issuance of the Warrant Shares to the Holder, then this Warrant may also be exercised, in
whole or in part, at such time by means of a “cashless exercise” in which the Holder shall be entitled to receive a
number of Warrant Shares equal to the quotient obtained by dividing [(A-B) (X)] by (A), where:


 


	 	(A)	=	 as applicable: (i) the VWAP on the Trading Day immediately
preceding the date of the applicable Notice of Exercise if such Notice of Exercise is (1) both executed and delivered pursuant to Section
2(a) hereof on a day that is not a Trading Day or (2) both executed and delivered pursuant to Section 2(a) hereof on a Trading Day prior
to the opening of “regular trading hours” (as defined in Rule 600(b) of Regulation NMS promulgated under the federal securities
laws) on such Trading Day, (ii) at the option of the Holder, either (y) the VWAP on the Trading Day immediately preceding the date of
the applicable Notice of Exercise or (z) the Bid Price of the Common Stock on the principal Trading Market as reported by Bloomberg L.P.
(“Bloomberg”) as of the time of the Holder’s execution of the applicable Notice of Exercise if such Notice of
Exercise is executed during “regular trading hours” on a Trading Day and is delivered within two (2) hours thereafter (including
until two (2) hours after the close of “regular trading hours” on a Trading Day) pursuant to Section 2(a) hereof or (iii)
the VWAP on the date of the applicable Notice of Exercise if the date of such Notice of Exercise is a Trading Day and such Notice of
Exercise is both executed and delivered pursuant to Section 2(a) hereof after the close of “regular trading hours” on such
Trading Day;




 


	 	(B)	=	the Exercise Price of this Warrant, as adjusted hereunder; and




 


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




 


If
Warrant Shares are issued in such a cashless exercise, the parties acknowledge and agree that in accordance with Section 3(a)(9) of the
Securities Act, the Warrant Shares shall take on the registered characteristics of the Warrants being exercised. The Company agrees not
to take any position contrary to this Section 2(c).


 




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“Bid
Price” 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 a Trading Market, the bid price of the Common Stock for the time in question (or the nearest preceding date)
on the Trading Market on which the Common Stock is then listed or quoted as reported by Bloomberg (based on a Trading Day from 9:30 a.m.
(New York City time) to 4:02 p.m. (New York City time)), (b) if OTCQB or OTCQX is not a Trading Market, the volume weighted average price
of the Common Stock for such date (or the nearest preceding date) on OTCQB or OTCQX as applicable, (c) if the Common Stock is not then
listed or quoted for trading on OTCQB or OTCQX and if prices for the Common Stock are then reported on The Pink Open Market (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 Purchasers of a majority in interest of the Securities then outstanding and reasonably acceptable to the Company, the fees
and expenses of which shall be paid by the Company.


 


“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 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 (based on a Trading Day from 9:30 a.m.
(New York City time) to 4:02 p.m. (New York City time)), (b) if OTCQB or OTCQX is not a Trading Market, the volume weighted average price
of the Common Stock for such date (or the nearest preceding date) on OTCQB or OTCQX as applicable, (c) if the Common Stock is not then
listed or quoted for trading on OTCQB or OTCQX and if prices for the Common Stock are then reported on The Pink Open Market (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 Purchasers of a majority in interest of the Securities then outstanding and reasonably acceptable to the Company, the fees
and expenses of which shall be paid by the Company.


 


Notwithstanding
anything herein to the contrary, on the Termination Date, this Warrant shall be automatically exercised via cashless exercise pursuant
to this Section 2(c).


 




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d)
Mechanics of Exercise.




 


i. Delivery
of Warrant Shares Upon Exercise. The Company shall cause the Warrant Shares purchased hereunder to be transmitted by the
Transfer Agent to the Holder by crediting the account of the Holder’s or its designee’s balance account with The
Depository Trust Company through its Deposit or Withdrawal at Custodian system (“DWAC”) if the Company is then a
participant in such system and either (A) there is an effective registration statement permitting the issuance of the Warrant Shares
to or resale of the Warrant Shares by Holder or (B) this Warrant is being exercised via cashless exercise, and otherwise by physical
delivery of a certificate, registered in the Company’s share register in the name of the Holder or its designee, for the
number of Warrant Shares to which the Holder is entitled pursuant to such exercise to the address specified by the Holder in the
Notice of Exercise by the date that is the earliest of (i) two (2) Trading Days after the delivery to the Company of the Notice of
Exercise, (ii) one (1) Trading Day after delivery of the aggregate Exercise Price to the Company and (iii) the number of Trading
Days comprising the Standard Settlement Period after the delivery to the Company of the Notice of Exercise (such date, the
“Warrant Share Delivery Date”). Upon delivery of the Notice of Exercise, the Holder shall be deemed for all
corporate purposes to have become the holder of record of the Warrant Shares with respect to which this Warrant has been exercised,
irrespective of the date of delivery of the Warrant Shares, provided that payment of the aggregate Exercise Price (other than in the
case of a cashless exercise) is received within the earlier of (i) two (2) Trading Days and (ii) the number of Trading Days
comprising the Standard Settlement Period following delivery of the Notice of Exercise. If the Company fails for any reason to
deliver to the Holder the Warrant Shares subject to a Notice of Exercise by the Warrant Share Delivery Date, the Company shall pay
to the Holder, in cash, as liquidated damages and not as a penalty, for each $1,000 of Warrant Shares subject to such exercise
(based on the VWAP of the Common Stock on the date of the applicable Notice of Exercise), $10 per Trading Day (increasing to $20 per
Trading Day on the third Trading Day after the Warrant Share Delivery Date) for each Trading Day after such Warrant Share Delivery
Date until such Warrant Shares are delivered or Holder rescinds such exercise. The Company agrees to maintain a transfer agent that
is a participant in the FAST program so long as this Warrant remains outstanding and exercisable. As used herein, “Standard
Settlement Period” means the standard settlement period, expressed in a number of Trading Days, on the Company’s
primary Trading Market with respect to the Common Stock as in effect on the date of delivery of the Notice of Exercise.
Notwithstanding the foregoing, with respect to any Notice(s) of Exercise delivered on or prior to 12:00 p.m. (New York City time) on
the Initial Exercise Date, which may be delivered at any time after the time of execution of the Purchase Agreement, the Company
agrees to deliver the Warrant Shares subject to such notice(s) by 4:00 p.m. (New York City time) on the Initial Exercise Date and
the Initial Exercise Date shall be the Warrant Share Delivery Date for purposes hereunder, provided that payment of the aggregate
Exercise Price (other than in the case of a cashless exercise) is received by such Warrant Share Delivery Date.


 




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ii. Delivery
of New Warrants Upon Exercise. If this Warrant shall have been exercised in part, the Company shall, at the request of a Holder
and upon surrender of this Warrant certificate, at the time of delivery of the Warrant Shares, deliver to the Holder a new Warrant
evidencing the rights of the Holder to purchase the unpurchased Warrant Shares called for by this Warrant, which new Warrant shall
in all other respects be identical with this Warrant.


 


iii. Rescission
Rights. If the Company fails to cause the Transfer Agent to transmit to the Holder the Warrant Shares pursuant to Section
2(d)(i) by the Warrant Share Delivery Date, then the Holder will have the right to rescind such exercise.


 


iv. Compensation
for Buy-In on Failure to Timely Deliver Warrant Shares Upon Exercise. In addition to any other rights available to the Holder,
if the Company fails to cause the Transfer Agent to transmit to the Holder the Warrant Shares in accordance with the provisions of
Section 2(d)(i) above pursuant to an exercise on or before the Warrant Share Delivery Date, and if after such date the Holder is
required by its broker to purchase (in an open market transaction or otherwise) or the Holder’s brokerage firm otherwise
purchases, shares of Common Stock to deliver in satisfaction of a sale by the Holder of the Warrant Shares which the Holder
anticipated receiving upon such exercise (a “Buy-In”), then the Company shall (A) pay in cash to the Holder the
amount, if any, by which (x) the Holder’s total purchase price (including brokerage commissions, if any) for the shares of
Common Stock so purchased exceeds (y) the amount obtained by multiplying (1) the number of Warrant Shares that the Company was
required to deliver to the Holder in connection with the exercise at issue times (2) the price at which the sell order giving rise
to such purchase obligation was executed, and (B) at the option of the Holder, either reinstate the portion of the Warrant and
equivalent number of Warrant Shares for which such exercise was not honored (in which case such exercise shall be deemed rescinded)
or deliver to the Holder the number of shares of Common Stock that would have been issued had the Company timely complied with its
exercise and delivery obligations hereunder. For example, if the Holder purchases Common Stock having a total purchase price of
$11,000 to cover a Buy-In with respect to an attempted exercise of shares of Common Stock with an aggregate sale price giving rise
to such purchase obligation of $10,000, under clause (A) of the immediately preceding sentence the Company shall be required to pay
the Holder $1,000. The Holder shall provide the Company written notice indicating the amounts payable to the Holder in respect of
the Buy-In and, upon request of the Company, evidence of the amount of such loss. Nothing herein shall limit a Holder’s right
to pursue any other remedies available to it hereunder, at law or in equity including, without limitation, a decree of specific
performance and/or injunctive relief with respect to the Company’s failure to timely deliver shares of Common Stock upon
exercise of the Warrant as required pursuant to the terms hereof.


 




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v. No
Fractional Shares or Scrip. No fractional shares or scrip representing fractional shares shall be issued upon the exercise of
this Warrant. As to any fraction of a share which the Holder would otherwise be entitled to purchase upon such exercise, the Company
shall, at its election, either pay a cash adjustment in respect of such final fraction in an amount equal to such fraction
multiplied by the Exercise Price or round up to the next whole share.


 


vi. Charges,
Taxes and Expenses. Issuance of Warrant Shares shall be made without charge to the Holder for any issue or transfer tax or other
incidental expense in respect of the issuance of such Warrant Shares, all of which taxes and expenses shall be paid by the Company,
and such Warrant Shares shall be issued in the name of the Holder or in such name or names as may be directed by the Holder; provided, however,
that, in the event that Warrant Shares are to be issued in a name other than the name of the Holder, this Warrant when surrendered
for exercise shall be accompanied by the Assignment Form attached hereto duly executed by the Holder and the Company may require, as
a condition thereto, the payment of a sum sufficient to reimburse it for any transfer tax incidental thereto. The Company shall pay
all Transfer Agent fees required for same-day processing of any Notice of Exercise and all fees to the Depository Trust Company (or
another established clearing corporation performing similar functions) required for same-day electronic delivery of the Warrant
Shares.


 


vii. Closing
of Books. The Company will not close its stockholder books or records in any manner which prevents the timely exercise of this
Warrant, pursuant to the terms hereof.


 


		e)	Holder’s
                                            Exercise Limitations. The Company shall not effect any exercise of this Warrant, and
                                            a Holder shall not have the right to exercise any portion of this Warrant, pursuant to Section
                                            2 or otherwise, to the extent that after giving effect to such issuance after exercise as
                                            set forth on the applicable Notice of Exercise, the Holder (together with the Holder’s
                                            Affiliates, and any other Persons acting as a group together with the Holder or any of the
                                            Holder’s Affiliates (such Persons, “Attribution Parties”)), would
                                            beneficially own in excess of the Beneficial Ownership Limitation (as defined below). For
                                            purposes of the foregoing sentence, the number of shares of Common Stock beneficially owned
                                            by the Holder and its Affiliates and Attribution Parties shall include the number of shares
                                            of Common Stock issuable upon exercise of this 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 (i) exercise of the remaining, nonexercised portion of this Warrant beneficially owned
                                            by the Holder or any of its Affiliates or Attribution Parties and (ii) exercise or conversion
                                            of the unexercised or nonconverted portion of any other securities of the Company (including,
                                            without limitation, any other Common Stock Equivalents) subject to a limitation on conversion
                                            or exercise analogous to the limitation contained herein beneficially owned by the Holder
                                            or any of its Affiliates or Attribution Parties. Except as set forth in the preceding sentence,
                                            for purposes of this Section 2(e), 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 Holder that the Company is not representing to the Holder that
                                            such calculation is in compliance with Section 13(d) of the Exchange Act and the Holder is
                                            solely responsible for any schedules required to be filed in accordance therewith. To the
                                            extent that the limitation contained in this Section 2(e) applies, the determination of whether
                                            this Warrant is exercisable (in relation to other securities owned by the Holder together
                                            with any Affiliates and Attribution Parties) and of which portion of this Warrant is exercisable
                                            shall be in the sole discretion of the Holder, and the submission of a Notice of Exercise
                                            shall be deemed to be the Holder’s determination of whether this Warrant is exercisable
                                            (in relation to other securities owned by the Holder together with any Affiliates and Attribution
                                            Parties) and of which portion of this Warrant is exercisable, in each case subject to the
                                            Beneficial Ownership Limitation, and the Company shall have no obligation to verify or confirm
                                            the accuracy of such determination. 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 2(e),
                                            in determining the number of outstanding shares of Common Stock, a 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 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 Transfer Agent setting forth the number of shares of Common Stock outstanding. Upon
                                            the written or oral request of a Holder, the Company shall within one Trading Day confirm
                                            orally and in writing to the Holder the number of shares of Common Stock then outstanding.
                                            In any case, the number of outstanding shares of Common Stock shall be determined after giving
                                            effect to the conversion or exercise of securities of the Company, including this Warrant,
                                            by the Holder or its Affiliates or Attribution Parties since the date as of which such number
                                            of outstanding shares of Common Stock was reported. The “Beneficial Ownership Limitation”
                                            shall be [4.99%] [9.99%] of the number of shares of the Common Stock outstanding immediately
                                            after giving effect to the issuance of shares of Common Stock issuable upon exercise of this
                                            Warrant. The Holder, upon notice to the Company, may increase or decrease the Beneficial
                                            Ownership Limitation provisions of this Section 2(e), provided that the Beneficial Ownership
                                            Limitation in no event exceeds 9.99% of the number of shares of the Common Stock outstanding
                                            immediately after giving effect to the issuance of shares of Common Stock upon exercise of
                                            this Warrant held by the Holder and the provisions of this Section 2(e) shall continue to
                                            apply. Any increase in the Beneficial Ownership Limitation will not be effective until the
                                            61st day after such notice is delivered to the Company. The provisions of this
                                            paragraph shall be construed and implemented in a manner otherwise than in strict conformity
                                            with the terms of this Section 2(e) to correct this paragraph (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 this Warrant.



 




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Section
3. Certain Adjustments.


 


a) Stock
Dividends and Splits. If the Company, at any time while this Warrant is outstanding: (i) pays a stock dividend or otherwise
makes a distribution or distributions on shares of its Common Stock or any other equity or equity equivalent securities payable in
shares of Common Stock (which, for avoidance of doubt, shall not include any shares of Common Stock issued by the Company upon
exercise of this Warrant), (ii) subdivides outstanding shares of Common Stock into a larger number of shares, (iii) combines
(including by way of reverse stock split) outstanding shares of Common Stock into a smaller number of shares, or (iv) issues by
reclassification of shares of the Common Stock any shares of capital stock of the Company, then in each case the Exercise Price
shall be multiplied by a fraction of which the numerator shall be the number of shares of Common Stock (excluding treasury shares,
if any) outstanding immediately before such event and of which the denominator shall be the number of shares of Common Stock
outstanding immediately after such event, and the number of shares issuable upon exercise of this Warrant shall be proportionately
adjusted such that the aggregate Exercise Price of this Warrant shall remain unchanged. Any adjustment made pursuant to this Section
3(a) shall become effective immediately after the record date for the determination of stockholders entitled to receive such
dividend or distribution and shall become effective immediately after the effective date in the case of a subdivision, combination
or re-classification.


 


b)
[RESERVED]


 


c) Subsequent
Rights Offerings. In addition to any adjustments pursuant to Section 3(a) above, if at any time the Company grants, issues or
sells any Common Stock Equivalents or rights to purchase stock, warrants, securities or other property pro rata to the record
holders of any class of shares of Common Stock (the “Purchase Rights”), then the Holder will be entitled to
acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder could have acquired if
the Holder had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to any
limitations on exercise hereof, including without limitation, the Beneficial Ownership Limitation) immediately before the date on
which a record is taken for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken, the date as of
which the record holders of shares of Common Stock are to be determined for the grant, issue or sale of such Purchase Rights
(provided, however, that, to the extent that the Holder’s right to participate in any such Purchase Right would
result in the Holder exceeding the Beneficial Ownership Limitation, then the Holder shall not be entitled to participate in such
Purchase Right to such extent (or beneficial ownership of such shares of Common Stock as a result of such Purchase Right to such
extent) and such Purchase Right to such extent shall be held in abeyance for the Holder until such time, if ever, as its right
thereto would not result in the Holder exceeding the Beneficial Ownership Limitation).


 




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d) Pro
Rata Distributions. During such time as this Warrant is outstanding, if the Company shall declare or make any dividend or other
distribution of its assets (or rights to acquire its assets) to holders of shares of Common Stock, by way of return of capital or
otherwise (including, without limitation, any distribution of cash, stock or other securities, property or options by way of a
dividend, spin off, reclassification, corporate rearrangement, scheme of arrangement or other similar transaction) (a
“Distribution”), at any time after the issuance of this Warrant, then, in each such case, the Holder shall be
entitled to participate in such Distribution to the same extent that the Holder would have participated therein if the Holder had
held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to any limitations on
exercise hereof, including without limitation, the Beneficial Ownership Limitation) immediately before the date of which a record is
taken for such Distribution, or, if no such record is taken, the date as of which the record holders of shares of Common Stock are
to be determined for the participation in such Distribution (provided, however, that, to the extent that the Holder's
right to participate in any such Distribution would result in the Holder exceeding the Beneficial Ownership Limitation, then the
Holder shall not be entitled to participate in such Distribution to such extent (or in the beneficial ownership of any shares of
Common Stock as a result of such Distribution to such extent) and the portion of such Distribution shall be held in abeyance for the
benefit of the Holder until such time, if ever, as its right thereto would not result in the Holder exceeding the Beneficial
Ownership Limitation).


 


e) Fundamental
Transaction. If, at any time while this Warrant is 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 and all of its
Subsidiaries taken as a whole, 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, or (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, merger or scheme of arrangement)
with another Person or group of Persons whereby such other Person or group 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 this Warrant, the 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, at the option of the Holder (without regard to any limitation in Section 2(e) on the exercise of this
Warrant), the number of shares of Common Stock 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 (without regard to any limitation in Section 2(e) on the exercise of this Warrant). 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 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”) to assume in writing all of the obligations of the Company under this Warrant and the other Transaction Documents
in accordance with the provisions of this Section 3(e) pursuant to written agreements in form and substance reasonably satisfactory
to the Holder and approved by the Holder (without unreasonable delay) prior to such Fundamental Transaction and shall, at the option
of the Holder, deliver to the Holder in exchange for this Warrant a security of the Successor Entity evidenced by a written
instrument substantially similar in form and substance to this Warrant which is exercisable for a corresponding number of shares of
capital stock of such Successor Entity (or its parent entity) equivalent to the shares of Common Stock acquirable and receivable
upon exercise of this Warrant (without regard to any limitations on the exercise of this Warrant) prior to such Fundamental
Transaction, and with an exercise price which applies the exercise price hereunder to such shares of capital stock (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 this Warrant immediately prior to the consummation of such Fundamental Transaction), and which is reasonably satisfactory in form
and substance to the Holder. 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 and the other
Transaction Documents 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 and the other Transaction
Documents with the same effect as if such Successor Entity had been named as the Company herein.


 




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f) Calculations.
All calculations under this Section 3 shall be made to the nearest cent or the nearest 1/100th of a share, as the case may be. For
purposes of this Section 3, the number of shares of Common Stock deemed to be issued and outstanding as of a given date shall be the
sum of the number of shares of Common Stock (excluding treasury shares, if any) issued and outstanding.


 


g) Notice
to Holder.


 


i. Adjustment
to Exercise Price. Whenever the Exercise Price is adjusted pursuant to any provision of this Section 3, the Company shall
promptly deliver to the Holder by facsimile or email a notice setting forth the Exercise Price after such adjustment and any
resulting adjustment to the number of Warrant Shares and setting forth a brief statement of the facts requiring such
adjustment.


 


ii. Notice
to Allow Exercise by Holder. If (A) the Company shall declare a dividend (or any other distribution in whatever form) on the
Common Stock, (B) the Company shall declare a special nonrecurring cash dividend on or a redemption of the Common Stock, (C) the
Company shall authorize the granting to all holders of the Common Stock rights or warrants to subscribe for or purchase any shares
of capital stock of any class or of any rights, (D) the approval of any stockholders of the Company shall be required in connection
with any reclassification of the Common Stock, any consolidation or merger to which the Company is a party, any sale or transfer of
all or substantially all of its assets, or any compulsory share exchange whereby the Common Stock is converted into other
securities, cash or property, or (E) the Company shall authorize the voluntary or involuntary dissolution, liquidation or winding up
of the affairs of the Company, then, in each case, the Company shall cause to be delivered by facsimile or email to the Holder at
its last facsimile number or email address as it shall appear upon the Warrant Register of the Company, at least 20 calendar days
prior to the applicable record or effective date hereinafter specified, a notice stating (x) the date on which a record is to be
taken for the purpose of such dividend, distribution, redemption, rights or warrants, or if a record is not to be taken, the date as
of which the holders of the Common Stock of record to be entitled to such dividend, distributions, redemption, rights or warrants
are to be determined or (y) the date on which such reclassification, consolidation, merger, sale, transfer or share exchange is
expected to become effective or close, and the date as of which it is expected that holders of the Common Stock of record shall be
entitled to exchange their shares of the Common Stock for securities, cash or other property deliverable upon such reclassification,
consolidation, merger, sale, transfer or share exchange; provided that the failure to deliver such notice or any defect therein or
in the delivery thereof shall not affect the validity of the corporate action required to be specified in such notice. To the extent
that any notice provided in this Warrant constitutes, or contains, material, non-public information regarding the Company or any of
the Subsidiaries, the Company shall simultaneously file such notice with the Commission pursuant to a Current Report on Form 8-K.
The Holder shall remain entitled to exercise this Warrant during the period commencing on the date of such notice to the effective
date of the event triggering such notice except as may otherwise be expressly set forth herein.


 




    	9



     


    

 


h) Voluntary
Adjustment By Company. Subject to the rules and regulations of the Trading Market, the Company may at any time during the term
of this Warrant, subject to the prior written consent of the Holder, reduce the then current Exercise Price to any amount and for
any period of time deemed appropriate by the board of directors of the Company.


 


Section
4. Transfer of Warrant.


 


a) Transferability.
This Warrant and all rights hereunder (including, without limitation, any registration rights) are transferable, in whole or in
part, upon surrender of this Warrant at the principal office of the Company or its designated agent, together with a written
assignment of this Warrant substantially in the form attached hereto duly executed by the Holder or its agent or attorney and funds
sufficient to pay any transfer taxes payable upon the making of such transfer. Upon such surrender and, if required, such payment,
the Company shall execute and deliver a new Warrant or Warrants in the name of the assignee or assignees, as applicable, and in the
denomination or denominations specified in such instrument of assignment, and shall issue to the assignor a new Warrant evidencing
the portion of this Warrant not so assigned, and this Warrant shall promptly be cancelled. Notwithstanding anything herein to the
contrary, the Holder shall not be required to physically surrender this Warrant to the Company unless the Holder has assigned this
Warrant in full, in which case, the Holder shall surrender this Warrant to the Company within three (3) Trading Days of the date on
which the Holder delivers an assignment form to the Company assigning this Warrant in full. The Warrant, if properly assigned in
accordance herewith, may be exercised by a new holder for the purchase of Warrant Shares without having a new Warrant
issued.


 


b) New
Warrants. This Warrant may be divided or combined with other Warrants upon presentation hereof at the aforesaid office of the
Company, together with a written notice specifying the names and denominations in which new Warrants are to be issued, signed by the
Holder or its agent or attorney. Subject to compliance with Section 4(a), as to any transfer which may be involved in such division
or combination, the Company shall execute and deliver a new Warrant or Warrants in exchange for the Warrant or Warrants to be
divided or combined in accordance with such notice. All Warrants issued on transfers or exchanges shall be dated the initial
issuance date of this Warrant and shall be identical with this Warrant except as to the number of Warrant Shares issuable pursuant
thereto.


 


c) Warrant
Register. The Company shall register this Warrant, upon records to be maintained by the Company for that purpose (the
“Warrant Register”), in the name of the record Holder hereof from time to time. The Company may deem and treat
the registered Holder of this Warrant as the absolute owner hereof for the purpose of any exercise hereof or any distribution to the
Holder, and for all other purposes, absent actual notice to the contrary.


 




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Section
5. Miscellaneous.


 


a) No
Rights as Stockholder Until Exercise; No Settlement in Cash. This Warrant does not entitle the Holder to any voting rights,
dividends or other rights as a stockholder of the Company prior to the exercise hereof as set forth in Section 2(d)(i), except as
expressly set forth in Section 3. Without limiting any rights of a Holder to receive Warrant Shares on a “cashless
exercise” pursuant to Section 2(c) or to receive cash payments pursuant to Section 2(d)(i) and Section 2(d)(iv) herein, in no
event shall the Company be required to net cash settle an exercise of this Warrant.


 


b) Loss,
Theft, Destruction or Mutilation of Warrant. The Company covenants that upon receipt by the Company of evidence reasonably
satisfactory to it of the loss, theft, destruction or mutilation of this Warrant or any stock certificate relating to the Warrant
Shares, and in case of loss, theft or destruction, of indemnity or security reasonably satisfactory to it (which, in the case of the
Warrant, shall not include the posting of any bond), and upon surrender and cancellation of such Warrant or stock certificate, if
mutilated, the Company will make and deliver a new Warrant or stock certificate of like tenor and dated as of such cancellation, in
lieu of such Warrant or stock certificate.


 


c) Saturdays,
Sundays, Holidays, etc. If the last or appointed day for the taking of any action or the expiration of any right required or
granted herein shall not be a Business Day, then such action may be taken or such right may be exercised on the next succeeding
Business Day.


 


d) Authorized
Shares.


 


The
Company covenants that, during the period the Warrant is outstanding, it will reserve from its authorized and unissued Common Stock a
sufficient number of shares to provide for the issuance of the Warrant Shares upon the exercise of any purchase rights under this Warrant.
The Company further covenants that its issuance of this Warrant shall constitute full authority to its officers who are charged with
the duty of issuing the necessary Warrant Shares upon the exercise of the purchase rights under this Warrant. The Company will take all
such reasonable action as may be necessary to assure that such Warrant Shares may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of the Trading Market upon which the Common Stock may be listed. The Company covenants
that all Warrant Shares which may be issued upon the exercise of the purchase rights represented by this Warrant will, upon exercise
of the purchase rights represented by this Warrant and payment for such Warrant Shares in accordance herewith, be duly authorized, validly
issued, fully paid and nonassessable and free from all taxes, liens and charges created by the Company in respect of the issue thereof
(other than taxes in respect of any transfer occurring contemporaneously with such issue).


 


Except
and to the extent as waived or consented to by the Holder, the Company shall not by any action, including, without limitation, amending
its certificate of incorporation or through any reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale
of securities or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this Warrant,
but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such actions as may be necessary
or appropriate to protect the rights of Holder as set forth in this Warrant against impairment. Without limiting the generality of the
foregoing, the Company will (i) not increase the par value of any Warrant Shares above the amount payable therefor upon such exercise
immediately prior to such increase in par value, (ii) take all such action as may be necessary or appropriate in order that the Company
may validly and legally issue fully paid and nonassessable Warrant Shares upon the exercise of this Warrant and (iii) use commercially
reasonable efforts to obtain all such authorizations, exemptions or consents from any public regulatory body having jurisdiction thereof,
as may be, necessary to enable the Company to perform its obligations under this Warrant.


 




    	11



     


    

 


Before
taking any action which would result in an adjustment in the number of Warrant Shares for which this Warrant is exercisable or in the
Exercise Price, the Company shall obtain all such authorizations or exemptions thereof, or consents thereto, as may be necessary from
any public regulatory body or bodies having jurisdiction thereof.


 


e) Jurisdiction.
All questions concerning the construction, validity, enforcement and interpretation of this Warrant shall be determined in
accordance with the provisions of the Purchase Agreement.


 


f) Restrictions.
The Holder acknowledges that the Warrant Shares acquired upon the exercise of this Warrant, if not registered, and the Holder does
not utilize cashless exercise, will have restrictions upon resale imposed by state and federal securities laws.


 


g) Nonwaiver
and Expenses. No course of dealing or any delay or failure to exercise any right hereunder on the part of Holder shall operate
as a waiver of such right or otherwise prejudice the Holder’s rights, powers or remedies. Without limiting any other provision
of this Warrant or the Purchase Agreement, if the Company willfully and knowingly fails to comply with any provision of this
Warrant, which results in any material damages to the Holder, the Company shall pay to the Holder such amounts as shall be
sufficient to cover any costs and expenses including, but not limited to, reasonable attorneys’ fees, including those of
appellate proceedings, incurred by the Holder in collecting any amounts due pursuant hereto or in otherwise enforcing any of its
rights, powers or remedies hereunder.


 


h) Notices.
Any notice, request or other document required or permitted to be given or delivered to the Holder by the Company shall be delivered
in accordance with the notice provisions of the Purchase Agreement.


 


i) Limitation
of Liability. No provision hereof, in the absence of any affirmative action by the Holder to exercise this Warrant to purchase
Warrant Shares, and no enumeration herein of the rights or privileges of the Holder, shall give rise to any liability of the Holder
for the purchase price of any Common Stock or as a stockholder of the Company, whether such liability is asserted by the Company or
by creditors of the Company.


 




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j) Remedies.
The Holder, in addition to being entitled to exercise all rights granted by law, including recovery of damages, will be entitled to
specific performance of its rights under this Warrant. The Company agrees that monetary damages would not be adequate compensation
for any loss incurred by reason of a breach by it of the provisions of this Warrant and hereby agrees to waive and not to assert the
defense in any action for specific performance that a remedy at law would be adequate.


 


k) Successors
and Assigns. Subject to applicable securities laws, this Warrant and the rights and obligations evidenced hereby shall inure to
the benefit of and be binding upon the successors and permitted assigns of the Company and the successors and permitted assigns of
Holder. The provisions of this Warrant are intended to be for the benefit of any Holder from time to time of this Warrant and shall
be enforceable by the Holder or holder of Warrant Shares.


 


l) Amendment.
This Warrant may be modified or amended or the provisions hereof waived with the written consent of the Company and the
Holder.


 


m) Severability.
Wherever possible, each provision of this Warrant shall be interpreted in such manner as to be effective and valid under applicable
law, but if any provision of this Warrant shall be prohibited by or invalid under applicable law, such provision shall be
ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of such provisions or the remaining
provisions of this Warrant.


 


n) Headings.
The headings used in this Warrant are for the convenience of reference only and shall not, for any purpose, be deemed a part of this
Warrant.


 


********************


 


(Signature
Page Follows)


 




    	13



     


    

 


IN
WITNESS WHEREOF, the Company has caused this Warrant to be executed by its officer thereunto duly authorized as of the date first above
indicated.


 


	 	PULMATRIX,
    INC.
	 	 
	 	By:
    	                
	 	Name:	 
	 	Title:	 


 




    	14



     


    

 


NOTICE
OF EXERCISE


 


To:       PULMATRIX,
INC.


 


(1)
The undersigned hereby elects to purchase ________ Warrant Shares of the Company pursuant to the terms of the attached Warrant (only
if exercised in full), and tenders herewith payment of the exercise price in full, together with all applicable transfer taxes, if
any.


 


(2)
Payment shall take the form of (check applicable box):


 


[   ] in lawful money of the United States; or


 


[   ] if permitted the cancellation of such number of Warrant Shares as is necessary, in accordance with the formula set forth in subsection
2(c), to exercise this Warrant with respect to the maximum number of Warrant Shares purchasable pursuant to the cashless exercise procedure
set forth in subsection 2(c).


 


(3)
Please issue said Warrant Shares in the name of the undersigned or in such other name as is specified below:


 


_______________________________


 


 


The
Warrant Shares shall be delivered to the following DWAC Account Number:


 


_______________________________


 


_______________________________


 


_______________________________


 


	[SIGNATURE
    OF HOLDER]
	 
	Name
    of Investing Entity: ________________________________________________________________________
	Signature
    of Authorized Signatory of Investing Entity: _________________________________________________
	Name
    of Authorized Signatory: ___________________________________________________________________
	Title
    of Authorized Signatory: ____________________________________________________________________
	Date:
    ________________________________________________________________________________________


 




    	 



    	 



    

 


EXHIBIT
B


 


ASSIGNMENT
FORM


 


(To
assign the foregoing Warrant, execute this form and supply required information. Do not use this form to purchase shares.)


 


FOR
VALUE RECEIVED, the foregoing Warrant and all rights evidenced thereby are hereby assigned to


 


	Name:	 	 	
	 	 	 	(Please
    Print)
	 	 	 	 
	Address:	 	 	 
	 	 	 	(Please
    Print)



 


	Phone
    Number:	 	 	 
	Email
    Address:	 	 	 
	Dated:
    	 	 	 
	Holder’s
    Signature:	 	 	 
	Holder’s
    Address: