Document:

Exhibit 4.2

 

THE
REGISTERED HOLDER OF THIS COMMON STOCK PURCHASE WARRANT BY ITS ACCEPTANCE HEREOF, AGREES THAT IT WILL NOT SELL, TRANSFER OR ASSIGN
THIS COMMON STOCK PURCHASE WARRANT EXCEPT AS HEREIN PROVIDED AND THE REGISTERED HOLDER OF THIS COMMON STOCK PURCHASE WARRANT AGREES
THAT IT WILL NOT SELL, TRANSFER, ASSIGN, PLEDGE OR HYPOTHECATE THIS COMMON STOCK PURCHASE WARRANT OR CAUSE IT TO BE THE SUBJECT
OF ANY HEDGING, SHORT SALE, DERIVATIVE, PUT, OR CALL TRANSACTION THAT WOULD RESULT IN THE EFFECTIVE ECONOMIC DISPOSITION OF THE
COMMON STOCK PURCHASE WARRANT BY ANY PERSON FOR A PERIOD OF ONE HUNDRED EIGHTY (180) DAYS FOLLOWING THE EFFECTIVE DATE (DEFINED
BELOW) TO ANYONE OTHER THAN (I) [                ]
OR AN UNDERWRITER OR A SELECTED DEALER IN CONNECTION WITH THE OFFERING, OR (II) A BONA FIDE OFFICER OR PARTNER OF [               ]
OR OF ANY SUCH UNDERWRITER OR SELECTED DEALER AND IN ACCORDANCE WITH FINRA RULE 5110(G)(2).

 

THIS
COMMON STOCK PURCHASE WARRANT IS NOT EXERCISABLE PRIOR TO [               ]
[DATE THAT IS 180 DAYS FROM THE EFFECTIVE DATE OF THE OFFERING]. VOID AFTER 5:00 P.M., EASTERN TIME, [                    ]
[DATE THAT IS FIVE (5) YEARS FROM THE EFFECTIVE DATE OF THE OFFERING].

 

COMMON STOCK PURCHASE WARRANT

 

For the Purchase of [          ] Shares of Common Stock

of

SUMMIT SEMICONDUCTOR, INC.

 

1.       Purchase
Warrant. THIS CERTIFIES THAT, in consideration of funds duly paid by or on behalf of [                ]
(“Holder”), as registered owner of this Common Stock Purchase Warrant (this “Purchase Warrant”),
to Summit Semiconductor, Inc., a Delaware corporation (the “Company”), Holder is entitled, at any time or from
time to time from [                             ]
[DATE THAT IS 180 DAYS FROM THE EFFECTIVE DATE OF THE OFFERING] (the “Commencement Date”), and at or
before 5:00 p.m., Eastern time, [               ]
[DATE THAT IS FIVE (5) YEARS FROM THE EFFECTIVE DATE OF THE OFFERING] (the “Expiration Date”), but not
thereafter, to subscribe for, purchase and receive, in whole or in part, up to [               ]
shares of common stock of the Company, par value $0.0001 per share (the “Shares”), subject to adjustment as
provided in Section 5 hereof. If the Expiration Date is a day on which banking institutions are authorized by law to close, then
this Purchase Warrant may be exercised on the next succeeding day which is not such a day in accordance with the terms herein.
During the period ending on the Expiration Date, the Company agrees not to take any action that would terminate this Purchase Warrant.
This Purchase Warrant is initially exercisable at $[                    ]
per Share [125% of the price of the shares sold in the Offering]; provided, however, that upon the occurrence
of any of the events specified in Section 5 hereof, the rights granted by this Purchase Warrant, including the exercise price per
Share and the number of Shares to be received upon such exercise, shall be adjusted as therein specified. This Purchase Warrant
is being issued pursuant to the certain Underwriting Agreement (the “Underwriting Agreement”), dated [       ],
2018, by and among the Company, the Holder and other underwriters named therein, providing for the public offering (the “Offering”)
of shares of common stock, par value $0.0001 per share, of the Company (the “Common Stock”). The term “Effective
Date” shall mean the effective date of the Offering. The term “Exercise Price” shall mean the initial
exercise price or the adjusted exercise price, depending on the context.

  

    	 		 

     

    

 

		1.	Exercise.

 

1.1       Exercise
Form. In order to exercise this Purchase Warrant, the exercise form attached hereto must be duly executed and completed
and delivered to the Company, together with this Purchase Warrant and payment of the Exercise Price for the Shares being purchased
payable in cash by wire transfer of immediately available funds to an account designated by the Company or by certified check or
official bank check. If the subscription rights represented hereby shall not be exercised at or before 5:00 p.m., Eastern time,
on the Expiration Date, this Purchase Warrant shall become and be void without further force or effect, and all rights represented
hereby shall cease and expire.

 

1.2       Cashless
Exercise. If at any time after the Commencement Date there is no effective registration statement registering, or no current
prospectus available for, the resale of the Shares by the Holder, then in lieu of exercising this Purchase Warrant by payment of
cash or check payable to the order of the Company pursuant to Section 1.1 above, Holder may elect to receive the number of Shares
equal to the value of this Purchase Warrant (or the portion thereof being exercised), by surrender of this Purchase Warrant to
the Company, together with the exercise form attached hereto, in which event the Company shall issue to Holder, Shares in accordance
with the following formula:

 

Y(A-B)

X =             A

 

Where,

 

X = The number of Shares to be issued to Holder;

 

Y = The number of Shares for which the Purchase Warrant
is being exercised;

 

A = The fair market value of one Share; and

 

B = The Exercise Price.

 

For purposes of this Section
1.2, the fair market value of a Share is defined as follows:

 

(i)       if
the Common Stock is traded on a securities exchange, the fair market value shall be deemed to be the closing price on such exchange
on the trading day immediately prior to the date the exercise form is submitted to the Company in connection with the exercise
of the Purchase Warrant; or

 

(ii)       if
the Common Stock is actively traded over-the-counter, the fair market value shall be deemed to be the closing bid price on the
trading day immediately prior to the date the exercise form is submitted to the Company in connection with the exercise of the
Purchase Warrant; or

 

(iii)       if
there is no active public market, the value shall be the fair market value thereof, as determined in good faith by the Company’s
Board of Directors.

 

1.3       Legend.
Each certificate for the securities purchased under this Purchase Warrant shall bear a legend as follows unless such securities
have been registered under the Securities Act of 1933, as amended (the “Act”):

 

“The securities represented
by this certificate have not been registered under the Securities Act of 1933, as amended (the “Act”), or applicable
state law. Neither the securities nor any interest therein may be offered for sale, sold or otherwise transferred except pursuant
to an effective registration statement under the Securities Act, or pursuant to an exemption from registration under the Securities
Act and applicable state law which, in the opinion of counsel to the Company, is available.”

 

    	 		 

     

    

 

1.4       No
Obligation to Net Cash Settle. Notwithstanding anything to the contrary contained in this Purchase Warrant, in no event will
the Company be required to net cash settle the exercise of the Purchase Warrant. The holder of the Purchase Warrant will not be
entitled to exercise the Purchase Option unless it exercises such Purchase Warrant pursuant to the cashless exercise right or a
registration statement is effective, or an exemption from the registration requirements is available at such time and, if the Holder
is not able to exercise the Purchase Warrant, the Purchase Warrant will expire worthless.

 

		2.	Transfer.

 

2.1       General
Restrictions. The registered Holder of this Purchase Warrant agrees by his, her or its acceptance hereof, that such Holder
will not: (a) sell, transfer, assign, pledge or hypothecate this Purchase Warrant for a period of one hundred eighty (180) days
following the Effective Date to anyone other than: (i) [__________] (“[Underwriter]”) or another underwriter
or a selected dealer participating in the Offering, or (ii) a bona fide officer or partner of [Underwriter] or of any such underwriter
or selected dealer, in each case in accordance with FINRA Conduct Rule 5110(g)(1), or (b) cause this Purchase Warrant or the securities
issuable hereunder to be the subject of any hedging, short sale, derivative, put or call transaction that would result in the effective
economic disposition of this Purchase Warrant or the securities hereunder, except as provided for in FINRA Rule 5110(g)(2). On
and after one (1) year after the Effective Date, transfers to others may be made subject to compliance with or exemptions from
applicable securities laws. In order to make any permitted assignment, the Holder must deliver to the Company the assignment form
attached hereto duly executed and completed, together with the Purchase Warrant and payment of all transfer taxes, if any, payable
in connection therewith. The Company shall within five (5) Business Days transfer this Purchase Warrant on the books of the Company
and shall execute and deliver a new Purchase Warrant or Purchase Warrants of like tenor to the appropriate assignee(s) expressly
evidencing the right to purchase the aggregate number of Shares purchasable hereunder or such portion of such number as shall be
contemplated by any such assignment.

 

2.2       Restrictions
Imposed by the Securities Act. The securities evidenced by this Purchase Warrant shall not be transferred unless and until:
(i) the Company has received the opinion of counsel for the Holder that the securities may be transferred pursuant to an exemption
from registration under the Securities Act and applicable state securities laws, the availability of which is established to the
reasonable satisfaction of the Company (the Company hereby agreeing that the opinion of Cozen O’Connor shall be deemed satisfactory
evidence of the availability of an exemption), or (ii) a registration statement or a post-effective amendment to the Registration
Statement relating to the offer and sale of such securities has been filed by the Company and declared effective by the U.S. Securities
and Exchange Commission (the “Commission”) and compliance with applicable state securities law has been established.

 

		3.	Registration Rights.

 

		3.1	“Piggy-Back” Registration.

 

3.1.1       Grant
of Right. The Holder shall have the right, for a period of no more than seven (7) years from the Effective Date in accordance
with FINRA Rule 5110(f)(2)(G)(v), to include any portion of the Shares underlying the Purchase Warrants (collectively, the “Registrable
Securities”) as part of any other registration of securities filed by the Company (other than in connection with a transaction
contemplated by Rule 145(a) promulgated under the Securities Act or pursuant to Form S-8 or any equivalent form); provided,
however, that if, solely in connection with any primary underwritten public offering for the account of the Company, the
managing underwriter(s) thereof shall, in its reasonable discretion, impose a limitation on the number of shares of Common Stock
which may be included in the Registration Statement because, in such underwriter(s)’ judgment, marketing or other factors
dictate such limitation is necessary to facilitate public distribution, then the Company shall be obligated to include in such
Registration Statement only such limited portion of the Registrable Securities with respect to which the Holder requested inclusion
hereunder as the underwriter shall reasonably permit. Any exclusion of Registrable Securities shall be made pro rata among the
Holders seeking to include Registrable Securities in proportion to the number of Registrable Securities sought to be included by
such Holders; provided, however, that the Company shall not exclude any Registrable Securities unless the Company
has first excluded all outstanding securities, the holders of which are not entitled to inclusion of such securities in such Registration
Statement or are not entitled to pro rata inclusion with the Registrable Securities.

 

    	 		 

     

    

 

3.1.2       Terms.
The Company shall bear all fees and expenses attendant to registering the Registrable Securities pursuant to Section 3.1.1 hereof,
but the Holders shall pay any and all underwriting commissions and the expenses of any legal counsel selected by the Holders to
represent them in connection with the sale of the Registrable Securities. In the event of such a proposed registration, the Company
shall furnish the then Holders of outstanding Registrable Securities with not less than thirty (30) days written notice prior to
the proposed date of filing of such registration statement. Such notice to the Holders shall continue to be given for each registration
statement filed by the Company until such time as all of the Registrable Securities have been sold by the Holder. The holders of
the Registrable Securities shall exercise the “piggy-back” rights provided for herein by giving written notice within
ten (10) days of the receipt of the Company’s notice of its intention to file a registration statement. Except as otherwise
provided in this Purchase Warrant, there shall be no limit on the number of times the Holder may request registration under this
Section 3.1.2; provided, however, that such registration rights shall terminate upon on the sixth anniversary of
the Commencement Date.

 

		3.2	General Terms.

 

3.2.1       Indemnification.
The Company shall indemnify the Holder(s) of the Registrable Securities to be sold pursuant to any registration statement hereunder
and each person, if any, who controls such Holders within the meaning of Section 15 of the Securities Act or Section 20(a) of the
Securities Exchange Act of 1934, as amended (the “Exchange Act”), against all loss, claim, damage, expense or
liability (including all reasonable attorneys’ fees and other expenses reasonably incurred in investigating, preparing or
defending against any claim whatsoever) to which any of them may become subject under the Securities Act, the Exchange Act or otherwise,
arising from such registration statement but only to the same extent and with the same effect as the provisions pursuant to which
the Company has agreed to indemnify the Underwriters contained in Section 5.1 of the Underwriting Agreement between the Underwriters
and the Company, dated as of [                              ],
2018. The Holder(s) of the Registrable Securities to be sold pursuant to such registration statement, and their successors and
assigns, shall severally, and not jointly, indemnify the Company and its affiliates, against all loss, claim, damage, expense or
liability (including all reasonable attorneys’ fees and other expenses reasonably incurred in investigating, preparing or
defending against any claim whatsoever) to which they may become subject under the Securities Act, the Exchange Act or otherwise,
arising from information furnished by or on behalf of such Holders, or their successors or assigns, in writing, for specific inclusion
in such registration statement to the same extent and with the same effect as the provisions contained in Section 5.2 of the Underwriting
Agreement pursuant to which the Underwriters have agreed to indemnify the Company.

 

3.2.2       Exercise
of Purchase Warrants. Nothing contained in this Purchase Warrant shall be construed as requiring the Holder(s) to exercise
their Purchase Warrants prior to or after the initial filing of any registration statement or the effectiveness thereof.

  

    	 		 

     

    

 

3.2.3       Documents
Delivered to Holders. The Company shall furnish to each Holder participating in any underwritten offerings and to each underwriter
of any such offering, a signed counterpart, addressed to such Holder and underwriter, of: (i) an opinion of counsel to the Company,
dated the effective date of such registration statement (and an opinion dated the date of the closing under any underwriting agreement
related thereto), and (ii) a “cold comfort” letter dated the effective date of such registration statement (and a letter
dated the date of the closing under the underwriting agreement) signed by the independent registered public accounting firm which
has issued a report on the Company’s financial statements included in such registration statement, in each case covering
substantially the same matters with respect to such registration statement (and the prospectus included therein) and, in the case
of such accountants’ letter, with respect to events subsequent to the date of such financial statements, as are customarily
covered in opinions of issuer’s counsel and in accountants’ letters delivered to underwriters in underwritten public
offerings of securities. The Company shall also deliver promptly to each Holder participating in the underwritten offering requesting
the correspondence and memoranda described below and to the managing underwriter copies of all correspondence between the Commission
and the Company, its counsel or auditors and all memoranda relating to discussions with the Commission or its staff with respect
to the registration statement and permit each Holder and underwriter to do such investigation, upon reasonable advance notice,
with respect to information contained in or omitted from the registration statement as it deems reasonably necessary to comply
with applicable securities laws or rules of FINRA. Such investigation shall include access to books, records and properties and
opportunities to discuss the business of the Company with its officers and independent auditors, all to such reasonable extent
and at such reasonable times as any such Holder shall reasonably request.

 

3.2.4       Underwriting
Agreement. In the event the Company shall enter into an underwriting agreement with any managing underwriter(s), if any, selected
by the Company with respect to the Registrable Securities that are being registered pursuant to this Section 3, which managing
underwriter shall be reasonably satisfactory to the Majority Holders. Such agreement shall be reasonably satisfactory in form and
substance to the Company and such managing underwriters, and shall contain such representations, warranties and covenants by the
Company and such other terms as are customarily contained in agreements of that type used by the managing underwriter. The Holders
shall be parties to any underwriting agreement relating to an underwritten sale of their Registrable Securities and may, at their
option, require that any or all the representations, warranties and covenants of the Company to or for the benefit of such underwriters
shall also be made to and for the benefit of such Holders. Such Holders shall not be required to make any representations or warranties
to or agreements with the Company or the underwriters except as they may relate to such Holders, their Shares and their intended
methods of distribution.

 

3.2.5       Documents
to be Delivered by Holder(s). Each of the Holder(s) participating in any of the foregoing offerings shall furnish to the Company
a completed and executed questionnaire provided by the Company requesting information customarily sought of selling security holders.

 

3.2.6       Damages.
Should the registration or the effectiveness thereof required by Section 3.1 hereof be delayed by the Company or the Company otherwise
fails to comply with such provisions, the Holder(s) shall, in addition to any other legal or other relief available to the Holder(s),
be entitled to seek specific performance or other equitable (including injunctive) relief against the threatened breach of such
provisions or the continuation of any such breach, without the necessity of proving actual damages and without the necessity of
posting bond or other security.

 

		4.	New Purchase Warrants to be Issued.

 

4.1       Partial
Exercise or Transfer. Subject to the restrictions in Section 2 hereof, this Purchase Warrant may be exercised or assigned
in whole or in part. In the event of the exercise or assignment hereof in part only, upon surrender of this Purchase Warrant for
cancellation, together with the duly executed exercise or assignment form and funds sufficient to pay any Exercise Price and/or
transfer tax if exercised pursuant to Section 1.1 hereto, the Company shall cause to be delivered to the Holder without charge
a new Purchase Warrant of like tenor to this Purchase Warrant in the name of the Holder evidencing the right of the Holder to purchase
the number of Shares purchasable hereunder as to which this Purchase Warrant has not been exercised or assigned.

 

    	 		 

     

    

 

4.2       Lost
Certificate. Upon receipt by the Company of evidence satisfactory to it of the loss, theft, destruction or mutilation of
this Purchase Warrant and of reasonably satisfactory indemnification or the posting of a bond, the Company shall execute and deliver
a new Purchase Warrant of like tenor and date. Any such new Purchase Warrant executed and delivered as a result of such loss, theft,
mutilation or destruction shall constitute a substitute contractual obligation on the part of the Company.

 

		5.	Adjustments.

 

5.1       Adjustments
to Exercise Price and Number of Securities. The Exercise Price and the number of Shares underlying the Purchase Warrant
shall be subject to adjustment from time to time as hereinafter set forth:

 

5.1.1       Share
Dividends; Split Ups. If, after the date hereof, and subject to the provisions of Section 5.3 below, the number of outstanding
Shares is increased by a stock dividend payable in Shares or by a split up of Shares or other similar event, then, on the effective
day thereof, the number of Shares purchasable hereunder shall be increased in proportion to such increase in outstanding Shares,
and the Exercise Price shall be proportionately decreased.

 

5.1.2       Aggregation
of Shares. If, after the date hereof, and subject to the provisions of Section 5.3 below, the number of outstanding Shares
is decreased by a consolidation, combination or reclassification of Shares or other similar event, then, on the effective date
thereof, the number of Shares purchasable hereunder shall be decreased in proportion to such decrease in outstanding Shares, and
the Exercise Price shall be proportionately increased.

 

5.1.3       Replacement
of Securities upon Reorganization, etc. In case of any reclassification or reorganization of the outstanding Shares other than
a change covered by Section 5.1.1 or 5.1.2 hereof or that solely affects the par value of such Shares, or in the case of any share
reconstruction or amalgamation or consolidation of the Company with or into another corporation or other entity (other than a consolidation
or share reconstruction or amalgamation in which the Company is the continuing corporation and that does not result in any reclassification
or reorganization of the outstanding Shares), or in the case of any sale or conveyance to another corporation or entity of the
property of the Company as an entirety or substantially as an entirety in connection with which the Company is dissolved, the Holder
of this Purchase Warrant shall have the right thereafter (until the expiration of the right of exercise of this Purchase Warrant)
to receive upon the exercise hereof, for the same aggregate Exercise Price payable hereunder immediately prior to such event, the
kind and amount of shares of stock or other securities or property (including cash) receivable upon such reclassification, reorganization,
share reconstruction or amalgamation, or consolidation, or upon a dissolution following any such sale or transfer, by a Holder
of the number of Shares of the Company obtainable upon exercise of this Purchase Warrant immediately prior to such event; and if
any reclassification also results in a change in Shares covered by Section 5.1.1 or 5.1.2, then such adjustment shall be made pursuant
to Sections 5.1.1, 5.1.2 and this Section 5.1.3. The provisions of this Section 5.1.3 shall similarly apply to successive reclassifications,
reorganizations, share reconstructions or amalgamations, or consolidations, sales or other transfers.

 

5.1.4       Changes
in Form of Purchase Warrant. This form of Purchase Warrant need not be changed because of any change pursuant to this Section
5.1, and Purchase Warrants issued after such change may state the same Exercise Price and the same number of Shares as are stated
in the Purchase Warrants initially issued to the Holder in connection with the Offering. The acceptance by any Holder of the issuance
of new Purchase Warrants reflecting a required or permissive change shall not be deemed to waive any rights to an adjustment occurring
after the Commencement Date or the computation thereof.

 

    	 		 

     

    

 

5.2       Substitute
Purchase Warrant. In case of any consolidation of the Company with, or share reconstruction or amalgamation of the Company
with or into, another corporation or other entity (other than a consolidation or share reconstruction or amalgamation which does
not result in any reclassification or change of the outstanding Shares), the corporation or other entity formed by such consolidation
or share reconstruction or amalgamation shall execute and deliver to the Holder a supplemental Purchase Warrant providing that
the holder of each Purchase Warrant then outstanding or to be outstanding shall have the right thereafter (until the stated expiration
of such Purchase Warrant) to receive, upon exercise of such Purchase Warrant, the kind and amount of shares of stock and other
securities and property receivable upon such consolidation or share reconstruction or amalgamation, by a holder of the number of
Shares of the Company for which such Purchase Warrant might have been exercised immediately prior to such consolidation, share
reconstruction or amalgamation, sale or transfer. Such supplemental Purchase Warrant shall provide for adjustments which shall
be identical to the adjustments provided for in this Section 5. The above provision of this Section shall similarly apply to successive
consolidations or share reconstructions or amalgamations.

 

5.3       Elimination
of Fractional Interests. The Company shall not be required to issue certificates representing fractions of Shares upon
the exercise of the Purchase Warrant, nor shall it be required to issue scrip or pay cash in lieu of any fractional interests,
it being the intent of the parties that all fractional interests shall be eliminated by rounding any fraction up or down, as the
case may be, to the nearest whole number of Shares or other securities, properties or rights.

 

6.            Reservation
and Listing. The Company shall at all times reserve and keep available out of its authorized Shares, solely for the purpose
of issuance upon exercise of the Purchase Warrants, such number of Shares or other securities, properties or rights as shall be
issuable upon the exercise thereof. The Company covenants and agrees that, upon exercise of the Purchase Warrants and payment of
the Exercise Price therefor, in accordance with the terms hereby, all Shares and other securities issuable upon such exercise shall
be duly and validly issued, fully paid and non-assessable and not subject to preemptive rights of any shareholder. The Company
further covenants and agrees that upon exercise of the Purchase Warrants and payment of the exercise price therefor, all Shares
and other securities issuable upon such exercise shall be duly and validly issued, fully paid and non-assessable and not subject
to preemptive rights of any shareholder. As long as the Purchase Warrants shall be outstanding, the Company shall use its commercially
reasonable efforts to cause all Shares issuable upon exercise of the Purchase Warrants to be listed (subject to official notice
of issuance) on all national securities exchanges (or, if applicable, on the OTC Bulletin Board or any successor trading market)
on which the Shares issued to the public in the Offering may then be listed and/or quoted.

 

		7.	Certain Notice Requirements.

 

7.1       Holder’s
Right to Receive Notice. Nothing herein shall be construed as conferring upon the Holders the right to vote or consent
or to receive notice as a shareholder for the election of directors or any other matter, or as having any rights whatsoever as
a shareholder of the Company. If, however, at any time prior to the expiration of the Purchase Warrants and their exercise, any
of the events described in Section 7.2 shall occur, then, in one or more of said events, the Company shall give written notice
of such event at least fifteen (15) days prior to the date fixed as a record date or the date of closing the transfer books for
the determination of the shareholders entitled to such dividend, distribution, conversion or exchange of securities or subscription
rights, or entitled to vote on such proposed dissolution, liquidation, winding up or sale. Such notice shall specify such record
date or the date of the closing of the transfer books, as the case may be. Notwithstanding the foregoing, the Company shall deliver
to each Holder a copy of each notice given to the other shareholders of the Company at the same time and in the same manner that
such notice is given to the shareholders.

 

    	 		 

     

    

 

7.2       Events
Requiring Notice. The Company shall be required to give the notice described in this Section 7 upon one or more of the
following events: (i) if the Company shall take a record of the holders of its Shares for the purpose of entitling them to receive
a dividend or distribution payable otherwise than in cash, or a cash dividend or distribution payable otherwise than out of retained
earnings, as indicated by the accounting treatment of such dividend or distribution on the books of the Company, (ii) the Company
shall offer to all the holders of its Shares any additional shares of capital stock of the Company or securities convertible into
or exchangeable for shares of capital stock of the Company, or any option, right or warrant to subscribe therefor, or (iii) a dissolution,
liquidation or winding up of the Company (other than in connection with a consolidation or share reconstruction or amalgamation)
or a sale of all or substantially all of its property, assets and business shall be proposed.

 

7.3       Notice
of Change in Exercise Price. The Company shall, promptly after an event requiring a change in the Exercise Price pursuant
to Section 5 hereof, send notice to the Holders of such event and change (“Price Notice”). The Price Notice
shall describe the event causing the change and the method of calculating same and shall be certified as being true and accurate
by the Company’s Chief Financial Officer.

 

7.4       Transmittal
of Notices. All notices, requests, consents and other communications under this Purchase Warrant shall be in writing and
shall be deemed to have been duly made when hand delivered, or mailed by express mail or private courier service: (i) if to the
registered Holder of the Purchase Warrant, to the address of such Holder as shown on the books of the Company, or (ii) if to the
Company, to following address or to such other address as the Company may designate by notice to the Holders:

 

If to the Holder:

____________

____________

____________

Attn: [●]

with a copy (which shall not constitute notice) to:

 

Carmel, Milazzo & DiChiara LLP 

55 West 39th Street

New York, NY 10018

Attention: Peter DiChiara 

Facsimile: 646-838-1314 

Email: pdichiara@cmdllp.com

 

If to the Company:

 

Summit Semiconductor, Inc.

Chief Executive Officer

Summit Semiconductor, Inc.

6840 Via Del Oro Ste. 280

San Jose, CA 95119

 

    	 		 

     

    

with a copy (which shall not constitute notice) to:

 

Robinson Brog Leinwand Greene Genovese & Gluck, P.C.

875 3rd Avenue

New York, NY 10022

Attention: David E. Danovitch, Esq.

 

		8.	Miscellaneous.

 

8.1       Amendments.
The Company and [Underwriter] may from time to time supplement or amend this Purchase Warrant without the approval of any of the
Holders in order to cure any ambiguity, to correct or supplement any provision contained herein that may be defective or inconsistent
with any other provisions herein, or to make any other provisions in regard to matters or questions arising hereunder that the
Company and [Underwriter] may deem necessary or desirable and that the Company and [Underwriter] deem shall not adversely affect
the interest of the Holders. All other modifications or amendments shall require the written consent of and be signed by the party
against whom enforcement of the modification or amendment is sought.

 

8.2       Headings.
The headings contained herein are for the sole purpose of convenience of reference, and shall not in any way limit or affect the
meaning or interpretation of any of the terms or provisions of this Purchase Warrant.

 

8.3       Entire
Agreement. This Purchase Warrant (together with the other agreements and documents being delivered pursuant to or in connection
with this Purchase Warrant) constitutes the entire agreement of the parties hereto with respect to the subject matter hereof, and
supersedes all prior agreements and understandings of the parties, oral and written, with respect to the subject matter hereof.

 

8.4       Binding
Effect. This Purchase Warrant shall inure solely to the benefit of and shall be binding upon, the Holder and the Company
and their permitted assignees, respective successors, legal representative and assigns, and no other person shall have or be construed
to have any legal or equitable right, remedy or claim under or in respect of or by virtue of this Purchase Warrant or any provisions
herein contained.

 

8.5       Governing
Law; Submission to Jurisdiction; Trial by Jury. This Purchase Warrant shall be governed by and construed and enforced in
accordance with the laws of the State of New York, without giving effect to conflict of laws principles thereof. The Company hereby
agrees that any action, proceeding or claim against it arising out of, or relating in any way to this Purchase Warrant shall be
brought and enforced in the New York Supreme Court, County of New York, or in the United States District Court for the Southern
District of New York, and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive. The Company hereby waives
any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum. Any 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 7 hereof. Such mailing shall be deemed personal service and
shall be legal and binding upon the Company in any action, proceeding or claim. The Company and the Holder agree that the prevailing
party(ies) in any such action shall be entitled to recover from the other party(ies) all of its reasonable attorneys’ fees
and expenses relating to such action or proceeding and/or incurred in connection with the preparation therefor. The Company (on
its behalf and, to the extent permitted by applicable law, on behalf of its stockholders and affiliates) and the Holder hereby
irrevocably waive, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding
arising out of or relating to this Agreement or the transactions contemplated hereby.

 

    	 		 

     

    

 

8.6       Waiver,
etc. The failure of the Company or the Holder to at any time enforce any of the provisions of this Purchase Warrant shall
not be deemed or construed to be a waiver of any such provision, nor to in any way affect the validity of this Purchase Warrant
or any provision hereof or the right of the Company or any Holder to thereafter enforce each and every provision of this Purchase
Warrant. No waiver of any breach, non-compliance or non-fulfillment of any of the provisions of this Purchase Warrant shall be
effective unless set forth in a written instrument executed by the party or parties against whom or which enforcement of such waiver
is sought; and no waiver of any such breach, non-compliance or non-fulfillment shall be construed or deemed to be a waiver of any
other or subsequent breach, non-compliance or non-fulfillment.

 

8.7       Execution
in Counterparts. This Purchase Warrant may be executed in one or more counterparts, and by the different parties hereto
in separate counterparts, each of which shall be deemed to be an original, but all of which taken together shall constitute one
and the same agreement, and shall become effective when one or more counterparts has been signed by each of the parties hereto
and delivered to each of the other parties hereto. Such counterparts may be delivered by facsimile transmission or other electronic
transmission.

 

[Signature Page Follows]

 

    	 		 

     

    

  

IN WITNESS WHEREOF, the
Company has caused this Purchase Warrant to be signed by its duly authorized officer as of the ______ day of ________________,
2018.

  

	 	SUMMIT SEMICONDUCTOR, INC.
	 	 	 
	 	By:	 
	 	 	Name:	 
	 	 	Title:	 

    	 		 

     

    

  

[Form to be used to exercise Purchase Warrant]

 

Date: _______________, 20___

 

The undersigned hereby
elects irrevocably to exercise the Purchase Warrant for  ___ shares of common stock, par value $0.0001 per share (the
“Shares”), of Summit Semiconductor, Inc., a Delaware corporation (the “Company”), and hereby
makes payment of $ (at the rate of $  per Share) in payment of the Exercise Price pursuant thereto. Please
issue the Shares as to which this Purchase Warrant is exercised in accordance with the instructions given below and, if applicable,
a new Purchase Warrant representing the number of Shares for which this Purchase Warrant has not been exercised.

 

or

 

The undersigned hereby
elects irrevocably to convert its right to purchase ___ Shares of the Company under the Purchase Warrant for ______ Shares, as
determined in accordance with the following formula:

 

Y(A-B)

 

X =             A

 

Where,

 

X = The number of Shares to be issued to Holder;

 

Y = The number of Shares for which the Purchase Warrant
is being exercised;

 

A = The fair market value of one Share which is equal
to $_____; and

 

B = The Exercise Price which is equal to $______ per share

 

The undersigned agrees
and acknowledges that the calculation set forth above is subject to confirmation by the Company and any disagreement with respect
to the calculation shall be resolved by the Company in its sole discretion.

 

Please issue the Shares
as to which this Purchase Warrant is exercised in accordance with the instructions given below and, if applicable, a new Purchase
Warrant representing the number of Shares for which this Purchase Warrant has not been converted.

 

Signature

 

	
         Signature Guaranteed 
	 	

 

    	 		 

     

    

  

INSTRUCTIONS FOR REGISTRATION OF SECURITIES

 

	
        Name:
	
	 	 
	 	(Print in Block Letters)
	 	 
	Address:	 
	 	 
	 	 
	 	 
	 	 

 

NOTICE: The signature to
this form must correspond with the name as written upon the face of the Purchase Warrant without alteration or enlargement or any
change whatsoever, and must be guaranteed by a bank, other than a savings bank, or by a trust company or by a firm having membership
on a registered national securities exchange.

 

    	 		 

     

    

  

[Form to be used to assign Purchase Warrant]

 

ASSIGNMENT

 

(To be executed by the registered Holder to
effect a transfer of the within Purchase Warrant):

 

FOR VALUE RECEIVED, __________________ does
hereby sell, assign and transfer unto the right to purchase shares of common stock, par value $0.0001 per share, of Summit Semiconductor,
Inc., a Delaware corporation (the “Company”), evidenced by the Purchase Warrant and does hereby authorize the
Company to transfer such right on the books of the Company.

 

Dated: __________, 20__

 

Signature

	
         

        Signature Guaranteed
	

 

NOTICE: The signature to this form must correspond with the name
as written upon the face of the within Purchase Warrant without alteration or enlargement or any change whatsoever, and must be
guaranteed by a bank, other than a savings bank, or by a trust company or by a firm having membership on a registered national
securities exchange.Exhibit 4.3

 

SECURED PROMISSORY NOTE

 

	$500,000.00	January 5, 2015
	 	Portland, Oregon

 

FOR VALUE RECEIVED, Summit Semiconductor
LLC, a Delaware limited liability company (“Borrower”), promises to pay to the order of Meriwether Mezzanine
Partners, L.P., a Delaware limited partnership (“Lender”), or registered assigns, in lawful money of the United
States of America, the principal sum of $500,000.00, together with accrued interest, on July 5, 2015 (the “Maturity Date”).

 

The following is a statement of the rights
of Lender and the conditions to which this Note (the “Note”) is subject, and to which Lender, by the acceptance
of this Note, agrees:

 

1.          Interest
and Payments. Interest shall accrue on a simple interest basis on the outstanding principal balance at a rate of 1.25% per
month, from the date hereof until this Note is paid in full. All payments to be made by Borrower pursuant to the terms of this
Note shall be made in U.S. dollars and at such place as Lender hereof may from time to time designate in writing to Borrower as
follows:

 

(a)          On
February 5, 2015, and the 5th day of each month thereafter through the Maturity Date, Borrower shall make payments of accrued interest
on the outstanding principal amount of this Note, with such interest payments being equal to $6,250.00.

 

(b)          On
the Maturity Date, Borrower shall pay Lender the entire unpaid principal amount of this Note and all accrued unpaid interest hereon.
Promptly following the payment in full of this Note, Lender shall surrender this Note to Borrower for cancellation.

 

2.          Prepayment.
This Note may be prepaid before the Maturity Date without penalty, provided however, that (i) any prepayment made on a date
that is not a regular payment date must be accompanied by interest to the next regular payment date, and (ii) such prepayment will
not be credited to Borrower’s account until such regular payment date.

 

3.          Events
of Default. The occurrence of any of the following events will constitute an “Event of Default” by Borrower:
(a) Borrower fails to make any payment when due; (b) Borrower breaks any promise Borrower has made to Lender, or Borrower
fails to comply with or to perform when due any other term, obligation, covenant, or condition contained in this Note, the Security
Agreement, any other agreement related to this Note or the Security Agreement, or in any other agreement or loan Borrower has with
Lender; (c) any representation or statement made or furnished to Lender by Borrower or on Borrower’s behalf is false
or misleading in any material respect either now or at the time made or furnished; (d) Borrower becomes insolvent, a receiver
is appointed for any part of Borrower’s property, Borrower makes an assignment for the benefit of creditors, or any proceeding
is commenced either by Borrower or against Borrower under any bankruptcy or insolvency laws; (e) any creditor tries to take
any of Borrower’s property on or in which Lender has a lien or security interest; (f) Lender determines in good faith
that the prospect of payment of the indebtedness evidenced hereby or the prospect of performance of any agreement or obligation
securing the same or relating thereto is significantly impaired; (g) the members of Borrower as of the date hereof cease to
own and control at least 50% of Borrower’s limited liability company interests and voting rights; or (h) any of the events
described in this default section occurs with respect to any guarantor of this Note.

 

    	 	1	 

     

    

 

If any Event of Default, other than a monetary
Event of Default, is curable and if Borrower has not already been given a notice of a breach of the same provision of this Note,
it may be cured (and no Event of Default will have occurred) if Borrower, after receiving written notice from Lender demanding
cure: (a) cures the Event of Default within fifteen (15) days; or (b) if the cure requires more than fifteen (15) days,
immediately initiates steps which Lender deems in Lender’s sole discretion to be sufficient to cure the Event of Default
and thereafter continues and completes all reasonable and necessary steps sufficient to produce compliance as soon as reasonably
practical.

 

4.          Lender’s
Rights. Upon an Event of Default, Lender may declare the entire unpaid principal balance on this Note and all accrued unpaid
interest immediately due, without notice, and then Borrower will pay that amount. Upon an Event of Default, including failure to
pay upon final maturity, Lender, at its option, may also, if permitted under applicable law, do one or both of the following: (a)
increase the interest rate on this Note to an interest rate which is six percent (6%) per annum in excess of interest rate otherwise
applicable under this Note (which increased rate is referred to as the “Default Rate”), and (b) add any unpaid
accrued interest to principal and such sum will bear interest therefrom until paid at the Default Rate. The interest rate will
not exceed the maximum rate permitted by applicable law. Lender may have or pay someone else to help collect this Note if Borrower
does not pay. Borrower also will pay Lender that amount. This includes, subject to any limits under applicable law, Lender’s
attorneys’ fees and Lender’s legal expenses whether or not there is a lawsuit, including attorneys’ fees and
legal expenses for bankruptcy proceedings (including efforts to modify or vacate any automatic stay or injunction), appeals, and
any anticipated post-judgment collection services. If not prohibited by applicable law, Borrower also will pay any court costs,
in addition to all other sums provided by law.

 

5.          Security.
This Note is secured by a Loan and Security Agreement of even date herewith (the “Security Agreement”) and other
related security instruments to which reference is hereby made for a description of the nature and extent of the security, the
rights and limitations of the rights of the holder of this Note and the terms and conditions upon which this Note is secured.

 

6.          Lender
Advances. Lender may make advances under the Security Agreement or other instrument providing security for this Note, to protect
Lender’s interest in the Security Agreement or other instrument providing security for this Note from loss of value or damage.
Any money so advanced (including reasonable costs of recovery and attorneys’ fees) plus interest at the Default Rate shall
become an obligation due and owing under the terms of this Note immediately upon the date advanced by Lender and is an obligation
of Borrower secured by the Security Agreement or other instrument providing security for this Note.

 

    	 	2	 

     

    

 

7.            Commercial
Loan. Borrower acknowledges that the proceeds of this Note are primarily for commercial, investment or business purposes, and
are not for a consumer transaction (which is defined as a transaction primarily for personal, family or household purposes).

 

8.            Governing
Law, and Jurisdiction. In the event of a lawsuit to enforce or interpret this Note, Borrower agrees, upon Lender’s request,
to submit to the jurisdiction of the courts of Multnomah County, State of Oregon. This Note shall be governed by and construed
in accordance with the laws of the State of Oregon, without regard to its choice of law principles.

 

9.            General.

 

(a)          This
Note shall bind the heirs, personal representatives, successors and assigns of each of the undersigned.

 

(b)          Borrower
waives protest, presentment, demand and notice of nonpayment and expressly agrees that this Note and the time for any payment under
this Note may be extended from time to time without in any way affecting the undertakings of the Borrower under this Note, the
Security Agreement or any other instrument securing this Note or Borrower’s obligations to Lender.

 

10.         Usury. Notwithstanding
any provision in this Note which might otherwise be construed to the contrary, it is the desire of Lender and Borrower that the
total liability for payments in the nature of interest shall not exceed the limits imposed by any applicable state or federal interest
rate laws. If any payments in the nature of interest, additional interest, and other charges made under this Note are held to be
in excess of the limits imposed by any applicable state or federal laws, then at Lender's option, any such excess amount shall
either be refunded to Borrower or shall be considered a premium-free prepayment of principal.

 

11.         Further
Assurances. Borrower agrees that from time to time, at its own expense, Borrower will promptly execute and deliver all further
instruments and documents, and take all further action, that may be necessary or desirable, or that Lender may request, in order
to perfect and protect any security interest granted hereby or to enable Lender to exercise and enforce its rights and remedies
hereunder with respect to any collateral. Borrower hereby authorizes Lender to take all action that may be necessary or desirable
to perfect and protect any security interest granted hereby, including without limitation the filing of any financing statement
or continuation statement, and any amendments thereto, with the appropriate governmental offices.

 

    	 	3	 

     

    

 

12.          NOTICE
TO BORROWER.

 

UNDER OREGON LAW, MOST AGREEMENTS, PROMISES AND COMMITMENTS
MADE BY US CONCERNING LOANS AND OTHER CREDIT EXTENSIONS WHICH ARE NOT FOR PERSONAL, FAMILY OR HOUSEHOLD PURPOSES OR SECURED SOLELY
BY THE BORROWER’S RESIDENCE MUST BE IN WRITING, EXPRESS CONSIDERATION AND BE SIGNED BY AN AUTHORIZED REPRESENTATIVE OF LENDER
TO BE ENFORCEABLE.

 

	BORROWER:	 
	 	SUMMIT SEMICONDUCTOR LLC, a Delaware 

limited liability company
	 	 	 
	 	By:  	/s/ Brett Moyer
	 	 	Brett Moyer, Chief Executive Officer

 

    	 	4

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