moderna
messenger therapeutics

February 17th, 2015
Dr. Tal Zaks

Re:    Employment by Moderna Therapeutics, Inc.
Dear Tal,
Moderna Therapeutics, Inc. (the "Company") is pleased to confirm its offer to
employ you as Chief Medical Officer. Your effective date of hire will be on or
before March 16, 2015 (the "Start Date"), and you will perform services for the
Company as a regular, full-time employee.
Your initial base salary for this position will be at the rate of $400,000 per
year, payable semi-monthly in accordance with the Company's normal pay schedule.
Your salary will be subject to periodic review and adjustments at the Company's
discretion.
You will be eligible to receive an annual performance bonus. The Company will
initially target the bonus at up to 30% of your annual salary rate (pro-rated
based on your Start Date). The actual bonus percentage is discretionary and will
be subject to the Company's assessment of your performance, as well as business
conditions at the Company. The bonus also will be subject to approval by and
adjustment at the discretion of the Board of Directors of the Company (the
"Board") and the terms of any applicable bonus plan. You must be employed on the
date a bonus is paid to earn that bonus. The Company expects to review your job
performance on an annual basis and expects to discuss with you the criteria
which the Company will use to assess your performance for bonus purposes.

Subject to the commencement of your employment with the Company, the Company
will recommend to the Board of Directors of Moderna LLC, the Company's parent
entity, that you be eligible to participate in Moderna LLC's equity incentive
program and be granted a "profits interest" in Moderna LLC, at such time as the
Board determines, in an aggregate amount of 150,000 Non-Voting Incentive Units,
pursuant to a plan to be adopted by the Board. The Non­ Voting Incentive Units
shall vest according to the following schedule: 25% of the Non-Voting Incentive
Units will vest on the first anniversary of the Start Date, and the remaining
75% of the Non-Voting Incentive Units will vest in equal calendar quarterly
installments over the next three years, provided in each case that you continue
to provide continuous services to the Company as of such vesting date. The grant
of the Non-Voting Incentive Units will be conditioned upon your execution of
Moderna LLC's form incentive unit grant agreement and a counterpart signature
page to Moderna LLC's Amended and Restated Limited Liability Agreement (the
"Operating Agreement"). The terms and conditions with respect to your Non-Voting
Incentive Units shall be set forth in the equity incentive plan to be adopted by
the Board and the associated incentive unit grant agreement and the Operating
Agreement.

In addition to your compensation, you may take advantage of various benefits
offered by the Company. Currently the Company provides group medical, dental and
vision insurance, short term disability coverage, group life insurance and a
401(k) plan. These benefits, of course, may be modified, changed or eliminated
from time to time at the sole discretion of the Company, and the provision of
such benefits to you in no way changes or impacts your status as an at-will
employee. Where a particular benefit is subject to a formal plan (for example,
medical insurance or life insurance), eligibility to participate in and receive
any particular benefit is governed solely by the applicable plan document.
Should you ever have any questions about Company benefits, you should ask for a
copy of the applicable plan document. You will also be eligible for vacation
pursuant to the Company's policies.
All forms of compensation referred to in this offer letter are subject to
reduction to reflect applicable withholding and payroll taxes and other
deductions required by law.
It is understood that you are an "at-will" employee. You are not being offered
employment for a definite period of time, and either you or the Company may
terminate the employment relationship at any time and for any reason without
prior notice and without additional compensation to you. Similarly, this offer
letters sets forth the initial terms and conditions of your employment, which
are subject to change at the company's discretion.
Your normal place of work will be Cambridge, Massachusetts; however, it is
understood that the Company may change your normal place of work according to
the Company's future needs. As a condition of your employment, you will need to
enter into a ''Non-Competition, Non-Solicitation, Confidentiality and Assignment
Agreement", a copy of which is enclosed. This offer is conditioned on your
representation that you are not subject to any confidentiality, non-competition
agreement or any other similar type of restriction that may affect your ability
to devote full time and attention to your work at the Company. If you have
entered into any agreement that may restrict your activities on behalf of the
Company, please provide me with a copy of the agreement as soon as possible. You
further represent that you have not used and will not use or disclose any trade
secret or other proprietary right of any previous employer or any other party.
The Immigration Reform and Control Act requires employers to verify the
employment eligibility and identity of new employees. Enclosed is a copy of the
Form 1-9 that you will be required to complete. Please bring the appropriate
documents listed on that form with you when you report for work. We will not be
able to employ you if you fail to comply with this requirement.
Please indicate your acceptance of this offer by signing and dating this letter
(PDF by email) and returning it by February 20th.

--------------------------------------------------------------------------------

Tal, we look forward to your joining the Company and are pleased that you will
be working with us to build a transformative company for patients.

Very truly yours,
MODERNA, INC.
 
By: Stéphane Bancel
Title: Chief Executive Officer
 
/s/ Stéphane Bancel
February 17th, 2015

Accepted and Agreed:
Dr. Tal Zaks
/s/ Dr. Tal Zaks