Exhibit 4.181



STOCK OPTION AGREEMENT



This STOCK OPTION AGREEMENT
(the “Agreement”) is made as of April 15, 2016 (the “Execution Date”), by and
between Prime Acquisition Corp., a Cayman Islands exempted company (the “Company”), and Amy Lau, (the
“Optionee”).



W I T N E S S E T H:



In consideration of the
premises and mutual covenants contained herein and for other good and valuable consideration, the receipt, validity and sufficiency
of which is hereby acknowledged, the parties agree as follows:



1.                 
Grant of Option. Subject to the terms and conditions of this Agreement, the Company confirms that it granted to the Optionee
the right (the “Option”) to purchase all or any part of an aggregate of 30,000 (thirty thousand) ordinary
shares of the Company, par value $0.001 per share (“Common Stock”).



2.                 
Vesting Schedule. This Option shall vest based on activities and/or services performed, as set out in Addendum A.



3.                 
Exercise Price. The price of each share of Common Stock purchased pursuant to this Option shall be U.S. $2.94.



4.                 
Exercise of Option. The Optionee may exercise the Option, in whole or in part, with respect to any whole number of vested
shares of Common Stock subject to the Option. The Optionee shall exercise the Option by giving the Company written notice, in a
form prescribed by the Company. Such notice shall specify the number of shares of Common Stock to be purchased and shall be accompanied
by payment, in U.S. dollars, in cash, by wire transfer of immediately available funds, or by certified check or by official bank
check, of an amount equal to the Option exercise price per share of Common Stock, multiplied by the number of shares of Common
Stock as to which the Option is being exercised; provided, however, that (i) [this Option may be exercised on a cashless basis,
in whole or in part, in accordance with the Cashless Exercise Formula (as defined below), and (ii) the purchase price may be paid
by the delivery of funds equal to the purchase price by a broker, in accordance with Regulation T promulgated by the Board of Governors
of the Federal Reserve System or as otherwise may be permissible by law. The board of directors of the Company (the “Board”)
may impose from time to time such limitations as it deems appropriate on the exercise of the Option.



For purposes of this
Agreement, the term “Cashless Exercise Formula” means:

N’= (N x (P - E))
/ P

where:

N’ =    the adjusted
number of shares of Common Stock issuable upon cashless exercise of the Option.

N =     the current number
of shares of Common Stock issuable upon exercise of the Option.

E =     the Exercise Price
on the date of cashless exercise of the Option.

P =     the average reported
last sales price of the Common Stock for the last 10 trading days ending on the third business day prior to the date on which notice
of cashless exercise is given.









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5.                 
Delivery of Common Stock Certificate. Subject to Section 6, as soon as practicable after receipt of the notice and payment
referred to in Section 4 above, the Company shall deliver to the Optionee (or, in the case of a broker financed exercise described
in Section 4, to the broker) a certificate or certificates for such shares of Common Stock purchased pursuant to the Option; provided,
however, that the time of such delivery may be postponed by the Company for such period of time as the Company may require for
compliance with any law, rule or regulation applicable to the issuance or transfer of shares of Common Stock.



6.                 
Payment of Taxes. Prior to or concurrently with delivery by the Company to the Optionee of a certificate or certificate(s)
representing such shares of Common Stock, the Optionee shall, if required by the IRS, upon notification of the amount due, promptly
pay or cause to be paid, in cash, any amount necessary to satisfy any tax requirements (or otherwise satisfy such requirements
in a manner satisfactory to the Company).



7.                 
Termination of Option. This Option and all rights of the Optionee to purchase shares of Common Stock hereunder shall terminate
on April 14, 2021 (the “Expiration Date”) unless terminated earlier in accordance with the terms hereof.
If the Optionee ceases its position or engagement with the Company, Optionee shall have 30 (thirty) days to exercise the Options.



8.                 
Notice. All notices, request, demands, waivers and communications required or permitted to be given hereunder shall be in
writing and shall be delivered in person or mailed, certified or registered mail with postage prepaid, or sent by facsimile, as
follows:



To Company:
Prime Acquisition Corp.

No. 322, Zhongshan East Road,

Shijiazhuang, Hebei Province, 050011

People’s Republic of China
Attn: Chief Executive Officer

To Optionee:

Amy Lau,

109 Cordova Street, San Francisco, CA 94112



or to such other address or to the attention of such other person
as the recipient party shall have specified by prior written notice to the sending party. In the case of mailing, all such notices,
requests, demands, waivers and communications shall be deemed to have been received on the third business day after the date of
the mailing. In the case of facsimile after 5:00 P.M. local time at the place of delivery or on a day that is not a business day,
all such notices, requests, demands, waivers and communications shall be deemed to have been received on the next business day.



9.                 
Certain Adjustments.



(a)               
In the event that the Company or the division, subsidiary or other affiliated entity for which the Optionee performs services is
sold (including a stock or an asset sale), spun off, merged, consolidated, reorganized or liquidated, the Board may determine that
(i) the Option shall be assumed, or a substantially equivalent Option shall be substituted, by an acquiring or succeeding entity
(or an affiliate thereof) on such terms as the Board determines to be appropriate; (ii) upon written notice to the Optionee, provide
that the Option shall terminate immediately prior to the consummation of the transaction unless exercised by the Optionee within
a specified period following the date of the notice (such period of time to be no less than 20 days); (iii) in the event of a sale
or similar transaction under the terms of which holders of Common Stock receive a payment for each share of Common Stock surrendered
in the transaction (the “Sales Price”), make or provide for a payment to each Optionee equal to the amount
by which (A) the Sales Price times the number of shares of Common Stock subject to the Option (to the extent such Option is then
exercisable) exceeds (B) the aggregate exercise price for all such shares of Common Stock; or (iv) may make such other equitable
adjustments as the Board deems appropriate.









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(b)              
In the event of any stock dividend or split, recapitalization, combination, exchange or similar change affecting the Common Stock,
the Board shall make any or all of the following adjustments as it deems appropriate to equitably reflect such event: (i) adjust
the option price to be paid for any or all shares subject to this Agreement, (ii) adjust the number of shares of Common Stock
(or such other security as is designated by the Board) subject to this Agreement and (iii) make any other equitable adjustments
or take such other equitable action as the Board, in its discretion, shall deem appropriate.



(c)               
Any and all adjustments or actions taken by the Board pursuant to this Section shall be conclusive and binding for all purposes.



10.             
No Restriction on the Right of the Company to Effect Corporate Changes. The Option granted hereunder shall not affect in
any way the right or power of the Company or its stockholders to make or authorize any or all adjustments, recapitalizations, reorganizations
or other changes in the Company’s capital structure or its business, or any merger or consolidation of the Company, or any
issue of stock or of options, warrants or rights to purchase stock or of bonds, debentures, preferred or prior preference stocks
whose rights are superior to or affect the Common Stock or the rights of holders thereof or which are convertible into or exchangeable
for Common Stock, or the dissolution or liquidation of the Company, or any sale or transfer of all or any part of its assets or
business, or any other corporate act or proceeding, whether of a similar character or otherwise.



11.             
No Shareholder Rights. The Optionee shall have no rights as a shareholder of the Company with respect to shares of Common
Stock subject to the Option until payment for such shares shall have been made in full and until the date of the issuance of share
certificates for such shares of Common Stock.



12.             
Nontransferability.



(a)               
Except as provided in paragraph (b) of this Section 12, or by will or the laws of descent and distribution, the Option is not transferable,
and may be exercised only by the Optionee. In the event of any attempt by the Optionee to transfer, assign, pledge, hypothecate
or otherwise dispose of the Option or of any right hereunder, except as provided for herein, or in the event of the levy of any
attachment, execution or similar process upon the rights or interest hereby conferred, the Company may terminate the Option by
notice to the Optionee and it shall thereupon become null and void.



(b)              
Notwithstanding paragraph (a), the Optionee may transfer the Option, by gift or a domestic relations order, to a family member
of the Optionee.



(c)               
Notwithstanding paragraphs (a) or (b), the Optionee may transfer the Option with the express, prior written consent of the Company,
which consent may be withheld for any reason or for no reason.



13.             
Representations By and Covenants of Optionee.



The following representations,
warranties and covenants by Optionee are made as of the date of this Agreement and, unless stated otherwise herein, are also made
as of each date of exercise of this Agreement.



(a)               
If applicable, the Optionee understands and consents to the placement of a legend on any certificate or other document evidencing
the Shares stating that they have not been registered under the Securities Act and setting forth or referring to the restrictions
on transferability and sale thereof.











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(b)              
Optionee hereby represents that the address of Optionee furnished by him on the signature page of this Agreement is accurate and
that said address is the Optionee’s principal residence. Optionee understands that the Company is relying on the accuracy
of this representation for purposes of its compliance with United States federal securities laws and state “blue sky”
laws.



(c)               
This Agreement has been duly executed and delivered by the Optionee and constitutes the legal, valid and binding obligation of
the Optionee, enforceable in accordance with its terms.



14.             
NSO. It is intended that this Option shall be a non-qualified stock option and shall not constitute an incentive stock option
for purposes of Section 422 of the Internal Revenue Code of 1986, as amended.



15.             
Compliance with Law; Registration of Shares.



(a)               
The Option grant provided hereunder shall be subject to all applicable laws, rules, and regulations of any applicable jurisdiction
or authority or agency thereof and to such approvals by any regulatory or governmental authority or agency or securities exchange
which, in the opinion of Company’s counsel, may be required or appropriate.



(b)              
Notwithstanding any other provision of this Agreement, the Company shall not be required to issue or deliver any certificate or
certificates for shares of Common Stock under this Agreement prior to fulfillment of all of the following conditions:



(i)                
Effectiveness of any registration or other qualification of such shares of the Company under any law or regulation of any applicable
jurisdiction, authority or agency that the Board, in its absolute discretion or upon the advice of counsel, deems necessary or
advisable; and



(ii)              
Grant of any other consent, approval or permit from any applicable jurisdiction or authority or agency thereof or securities exchange
which the Board shall, in its absolute discretion or upon the advice of counsel, deem necessary or advisable.



The Company shall use
all reasonable efforts to obtain any consent, approval or permit described above.



16.             
Headings. The headings of sections and subsections herein are included solely for convenience of reference and shall not
affect the meaning of any of the provisions of this Agreement.



17.             
Severability. In the event that any one or more provisions of this Agreement, or any action taken pursuant to this Agreement,
should, for any reason, be unenforceable or invalid in any respect under the laws of the United States, any state of the United
States or any other jurisdiction, such unenforceability or invalidity shall not affect any other provision of this Agreement, but
in such particular jurisdiction and instance this Agreement shall be construed as if such unenforceable or invalid provision had
not been contained therein or if the action in question had not been taken thereunder.



18.             
Board Determinations. In the event that any question or controversy shall arise with respect to the nature, scope or extent
of any one or more rights conferred by the Option, or any provision of this Agreement, the good faith determination by the Board
of the rights of the Optionee shall be conclusive, final and binding upon the Optionee and upon any other person who shall assert
any right pursuant to this Option.



19.             
Governing Law. This Agreement and all rights hereunder shall be construed in accordance with and governed by the internal
laws of the State of New York applicable to agreements made and to be performed within the State of New York, without giving effect
to any choice-of-law provisions thereof that would compel the application of the substantive laws of any other jurisdiction.









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20.             
Jurisdiction; Venue. The Optionee hereby agrees that any action, proceeding or claim against it arising out of, or relating
in any way to this Agreement shall be brought and enforced in the courts of the State of New York or of the United States of America
for the Southern District of New York, and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive. The
Optionee 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 Optionee 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 herein. Such mailing shall be deemed personal service
and shall be legal and binding upon the Optionee in any action, proceeding or claim. The Company and the Optionee 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.



21.             
Amendment. This Agreement may not be changed or modified except by an instrument in writing signed by both of the parties
hereto.



22.             
Counterparts. This Agreement may be executed in one or more counterparts, each of which shall be deemed to be an original,
all of which together will constitute one and the same instrument.



























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IN WITNESS WHEREOF, the
Company and the Optionee have executed this Agreement effective as of the date first written above.



PRIME ACQUISITION CORP.





By: /s/ Diana Liu

Name: DIANA LIU

Title: CHAIRMAN









OPTIONEE:





/s/ Amy Lau

Amy Lau



Address:

109 Cordova Street, San Francisco, CA 94112

Email: amylausf@gmail.com

































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ADDENDUM A

VESTING SCHEDULE



The Stock Option granted in the Stock Option Agreement shall
vest based on the following formula:



1/18(or 1,667 options) of the total Stock Option
shall vest on the monthly anniversary of the grant. The last monthly vesting shall be the remainder of whatever unvested options.



Vesting shall stop when the Optionee ceases her position as
the Interim Chief Financial Officer of the Company.































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