Exhibit 10.1
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Brandon Smith
[Address Redacted]
 
February 14, 2020

Dear Brandon:

I am pleased to confirm this offer for you to join Prothena Biosciences Inc
(“Prothena” or the “Company”). We are confident in your knowledge, expertise and
judgment, and believe your performance will meet our team’s high-quality
objectives and standards.

Your start date will be March 2, 2020, and the Prothena Corporation plc Board of
Directors will appoint you as Chief Business Officer effective March 2, 2020,
subject to your commencement of employment with the Company. In this position,
you will report to Gene Kinney (President and CEO), although your duties, title
and reporting relationship may change, based on the Company’s needs and
priorities. This is a full-time, exempt position – which means that you are not
eligible for overtime pay under state and federal laws.

Your starting annualized salary will be $400,000.00 (gross), paid twice per
month. Your pay is subject to applicable taxes and withholdings.

We agree to pay you a Retention Bonus of $100,000.00 (gross) which will be fully
earned in the event that you remain employed with Prothena for one year. The
entire Retention Bonus will be paid to you with your first paycheck, less
applicable taxes and withholdings. This Retention Bonus will be earned on a
pro-rata basis for each week worked during your initial one-year period of your
employment at Prothena. The unearned portion of this Retention Bonus will be
repayable by you to Prothena on a pro-rata basis if you cease employment at
Prothena prior to the one-year anniversary of your employment start date, unless
your employment ends for a reason that would make you eligible for severance
benefits in accordance with the Prothena Biosciences Inc Amended and Restated
Severance Plan. The forgoing will be set forth in a Retention Bonus Repayment
Agreement, a form of which is attached (Exhibit 1), that we will need you to
sign on your start date in order to receive the Retention Bonus.

Prothena embraces a pay-for-performance philosophy. All employees are currently
eligible for an annual cash bonus under the terms of the Company's cash
incentive plan (the Prothena Corporation plc Amended and Restated Incentive
Compensation Plan). The amount of these annual cash bonuses is determined by the
Company on the basis of a number of factors, including industry competitiveness,
Prothena’s business strategy, and the degree to which Company, function and/or
individual goals are met. Your targeted cash bonus for our 2020 performance year
will be 40% of

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Exhibit 10.1
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your actual salaried earnings during that year. A condition of earning any cash
incentive award is that you remain employed through the pay date of an otherwise
earned award, which will be paid no later than March 15, 2021. The cash bonus
plan is operated at the sole discretion of Prothena, is subject to review on a
regular basis and may change from time to time.

In connection with and subject to your commencement of employment and
appointment as Chief Business Officer, both effective March 2, 2020, you will
also be eligible to receive an option to acquire 240,000 shares of Prothena
Corporation plc. This stock option award is at the discretion of the
Compensation Committee of the Board of Directors of Prothena Corporation plc
(the “Committee”) and is subject to the approval and terms and conditions of the
Prothena Corporation plc 2020 Employment Inducement Incentive Plan and the terms
and conditions of the award agreement for such a stock option. The grant date of
this stock option will be March 2, 2020. The option exercise price will be equal
to the closing price of Prothena Corporation plc’s ordinary shares on the NASDAQ
Global Select Market on that date. Subject to your continued employment with the
Company, the stock option will vest 25% on the first anniversary of the grant
date, and monthly at a rate of 1/48th of the award thereafter, such that the
option will fully vest after a four-year period following the grant date.

On the first day of the month following your employment start date, you will be
eligible to participate in Prothena’s comprehensive health and welfare benefits
program. On your start date, you will also be eligible to participate in our
retirement benefits plan, as well as the Prothena Biosciences Inc Amended and
Restated Severance Plan. Details about these and other applicable plans will be
provided separately.

The Company provides paid vacation time to full-time employees in accordance
with the Company’s vacation policy in its Employee Handbook, which will be
provided to you upon commencement of your employment. You will also be eligible
for paid sick time as required by state law. Additional information about paid
sick time is contained in the Company’s Employee Handbook.

Further information regarding onboarding requirements and/or documents needed on
your employment start date (e.g., Employee Proprietary Information and Invention
Assignment Agreement, Code of Conduct, Form I-9 completion process, direct
deposit information, Form W-4 allowance elections) will be provided separately.

This offer is contingent upon your successful completion of a background check,
pre-employment drug test and certain other pre-employment requirements. More
information regarding these processes will be provided by Human Resources.

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Exhibit 10.1
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Additionally, your acceptance of this offer of employment and commencement of
that employment means that you understand and agree that your employment
relationship with the Company is at-will, for no specific period, and neither
this letter nor any other oral or written representations may be considered a
contract of employment for any specific period of time. As a result, you are
free to resign your employment with Prothena at any time, for any reason or no
reason. Similarly, Prothena is also free to end your employment at any time,
with or without cause or advance notice. At-will employment also means that the
Company may make decisions regarding other terms of your employment at any time
with or without advance notice or cause, including but not limited to demotion,
promotion, transfer, discipline, compensation and duties. Further, all benefits
and compensation provided by the Company are contingent upon your continued
employment.

To accept our offer, please sign this letter and return it to Kevin Hickey (VP,
Human Resources) by Tuesday, February 18, 2020. This offer is valid until then,
after which time we will not be able to accommodate an acceptance of this offer.
Accordingly, please sign and return this letter before the above-stated
expiration date. If you do not intend to accept this offer, we would like to be
notified as soon as possible.

This letter, along with the Company’s policies and procedures, sets forth the
terms of your employment with the Company if you accept this offer and commence
that employment, and supersedes any prior representations or agreements, whether
written or oral. This letter may be modified only by a written agreement signed
by you and an authorized officer of the Company.

We look forward to having you join Prothena as a full-time employee. If you have
any questions, or if you would like additional information to help you reach a
decision, please feel free to contact Kevin at (650) 837-8545. Please be sure to
bring with you on you first day of employment documentation that proves your
eligibility to work in the U.S., your bank details and emergency contact
information.

Sincerely,

/s/ Gene Kinney
Gene Kinney
President and CEO
Prothena Biosciences Inc

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Exhibit 10.1
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ACCEPTANCE:

s/ Brandon Smith                    February 18, 2020
Brandon Smith                        Date

Exhibit 1 – RETENTION BONUS REPAYMENT AGREEMENT

I, Brandon Smith, will receive $100,000.00 (gross) as a Retention Bonus with my
first paycheck, less applicable withholdings and deductions, from Prothena
Biosciences Inc (“Prothena” or the “Company”), which will not be fully earned
until I have provided 12 months of Active Service as described below.

I understand and agree that a key purpose of the Retention Bonus is my retention
as an employee, that the Retention Bonus is being paid to me before it is
earned, and that I have not earned the Retention Bonus until I complete 12
months of continuous Active Service. For purposes of this Retention Bonus,
“Active Service” includes periods from my employment start date that I am
continuously employed by the Company or its affiliates, including time off for
approved vacation, holidays, personal time, family & medical leave, and military
leave, but not other leaves of absence unless otherwise required by applicable
law.

I understand and agree that if I complete 12 months of Active Service from my
employment start date, then I have earned this Retention Bonus and have no
obligation to repay any portion of it upon termination of my employment.

I further understand and agree that if my employment terminates for any reason
(other than if my employment ends for a reason that would make me eligible for
severance benefits in accordance with the Prothena Biosciences Inc Amended and
Restated Severance Plan) prior to my completion of 12 months of Active Service
from my start date, then I must repay a pro-rata amount of the Retention Bonus
in one lump sum within 30 days of my termination date. Within 5 days of my
employment end date, the Company will notify me in writing of the amount to be
repaid.

If I fail to repay the amount due under this Retention Bonus Repayment Agreement
(this “Agreement”) within 30 days of the termination of my employment, then the
Company may bring legal proceedings against me for collection. I further agree
that for any claims brought by the Company to enforce the terms of this
Agreement, the prevailing party will be entitled to costs and reasonable
attorneys’ fees.

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Exhibit 10.1
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I agree and understand that nothing in this Agreement alters the at-will nature
of my employment with Prothena, meaning that my employment is for no definite
period and may be terminated either by me or the Company at any time, with or
without cause or advance notice.

I acknowledge that I understand the terms of this Agreement, that I have had an
opportunity to consult with counsel or another advisor prior to signing it, and
that I agree to abide by its terms. I am voluntarily signing this Agreement.

ACCEPTANCE:

[TO BE SIGNED AND DATED ON DAY 1 OF EMPLOYMENT]

___________________________________        ____________________
Brandon Smith                        Date