Document:

Exhibit 10.16

 

Quantitative Solutions BV Confidential

 

CONTRACT OF EMPLOYMENT FOR AN INDEFINITE
PERIOD OF TIME

 

THE UNDERSIGNED:

 

		1.	The private company with limited liability Quantitative Solutions B.V., established in (4818
SJ) Breda at Parkstraat 1-B, legally represented in this matter by Benjamin Management B.V., established in (4835 PT) Breda at
Prins Hendrikstraat 174, which company is legally represented in this matter by Mr E.H. Cox, hereinafter to be referred to as ‘the
Employer’;

 

and

 

		2.	Mr. Thomas Kerbusch, born on [           ], resident in [           ], The Netherlands at [          ], hereinafter to
be referred to as : ‘the Employee’;

 

jointly to be referred to hereinafter as:
 ‘the parties’;

 

DECLARE TO HAVE AGREED THE FOLLOWING:

 

Article 1 Commencement
and term

 

		1.	The Employee has entered the services of the Employer as from 1 July 2014 in the capacity of managing
director Europe (EU).

 

		2.	As from 1 July 2014 Employee will be employed in the capacity of managing director Europe for an
indefinite period of time.

 

		3.	The first two months after the commencement of employment is a trial period. During this period
both the employer and the employee can terminate the contract with immediate effect

 

		4.	The contract of employment can be cancelled by either of the parties in writing before the last day of a calendar month, with due observance of the statutory terms of notice and the other provisions concerning
                                                          notice.

 

Article 2 Job

 

		1.	The Employee is employed by the Employer in the capacity of managing director Europe. The job description
is attached to the employment agreement as Addendum 1.

 

		2.	The Employee is expected, if in the Employer’s opinion the situation at the company requires
such, to perform work other than that directly related to the job or to perform work at times or places other than are usual, such
in so far as the Employer can reasonably demand such.

 

	Employer’s initials:
	 	Employee’s initials:
/s/ TK

 

    

     

    

 

Quantitative Solutions BV Confidential

 

Article 3 Work location

 

The Employee will perform the work referred
to in this contract at one of the official Employer’s business addresses. Up to a certain extent, work from home is possible
and on mutual agreement between the Employer and the Employee. The Employee hereby declares that he is aware of the fact that the
nature of the job and the work means that work will also have to be performed at places other than the work location referred to.

 

Article 4 Working hours

 

		1.	The Employee is expected to work at least 40 hours a week, spread over 5 days.

 

		2.	The Employee is expected to perform the work during the Employer’s usual working hours. The
working hours are to be specified by the Employer.

 

		3.	If the scope of the work offered gives cause to do so, the Employee declares that he is prepared
to work for more than the number of hours per week referred to. On such occasions the Employer will consult beforehand with the
Employee.

 

Article 5 Salary and
other emoluments

 

		1.	The gross salary in the event of 40 working hours a week is € 10231 per month, excluding holiday
allowance.

 

		2.	The salary is to be paid retroactively, after deduction of the amounts required by law and agreed,
to the bank account specified by the Employee.

 

		3.	The Employee is to receive a holiday allowance of 8% annually in the month of May. The holiday
allowance is calculated on the basis of the gross salary for the period 1 June to 31 May. If the Employee leaves the company, he
will be entitled to a proportional amount of holiday allowance.

 

		4.	Employee will be reimbursed for commuting expenses according to statutory provisions.

 

Article 6 Leave and national
holidays

 

		1.	The Employee is entitled, on the basis of 40 working hours a week, to 25 days leave per year with
retention of salary. If the Employee leaves the company, the number of days leave will be determined proportionally.

 

		2.	If the Employee wants to take hours/days leave, he must submit a written request to the Employer
in which he indicates when and how many days leave he wishes to take. The request referred to must be submitted to the Employer
no later than:

 

		a.	five working days prior to the days leave to be taken if the number of days leave to be taken does not exceed three days;

 

	Employer’s initials:
	 	Employee’s initials:
/s/ TK

 

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Quantitative Solutions BV Confidential

 

		b.	three calendar weeks prior to the days leave to be taken if the number of days leave to be taken exceeds three days.

 

		3.	The Employer will determine the days leave in conformity with the Employee’s request except
in the event of substantial interests. If the Employer has any objections the employer will make these known to the Employee in
writing within two weeks after receipt of the request.

 

		4.	Furthermore the Employee has a day off during the following national holidays, also with retention
of salary: New Year’s Day, Good Friday, Easter Monday, The Kings Birthday, Ascension Day, Whitmonday, Christmas Day and Boxing
Day.

 

		5.	The employee is entitled to a 3-day company paid paternity leave for each newly arrived child,
in addition to two days entitled by Dutch legislation.

 

Article 7 Incapacity
for work

 

		1.	If, after being called upon to do so, the Employee is unable to perform the work stipulated or
suitable tasks due to illness or incapacity for work, the Employee will receive a payment in accordance with the statutory provisions
and for the period as described in Article 7:629 of the Dutch Civil Code.

 

		2.	The obligation to continue payment lapses, in principle, at the moment at which the contract of
employment ends.

 

		3.	The periods during which the Employee has been prevented from working as a consequence of illness
or incapacity for work are to be counted together if these periods succeed each other with intervals of less than four weeks.

 

		4.	If the Employee is unable to work due to illness or incapacity for work, the Employee is obliged
to notify the Employer to this effect in person by telephone.

 

		5.	During the period of illness the Employee must ensure that - in as far as is possible —he/she
can be contacted by the Employer and/or the Arbo-dienst (labour conditions and absenteeism monitoring body) as engaged by the Employer.
Employee must comply with all instructions of the Arbo-dienst and must everything to ensure that he will become capable for work
at the shortest possible notice.

 

		6.	If the incapacity for work by the Employee is the consequence of an event for which another party
is, or can be held, liable, the Employee must immediately provide the Employer with all the information and do everything in his
power to enable the Employer to exercise its right of recourse as referred to in Article 6:107a of the Dutch Civil Code.

 

Article 8 Bonus

 

		1.	The employee shall be entitled to a performance bonus.

 

	Employer’s initials:
	 	Employee’s initials:
/s/ TK

 

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Quantitative Solutions BV Confidential

 

		2.	At the end of every year the financial performance of the company will be evaluated and the employee
will be eligible to a bonus based on this financial performance. The Company’s gross profits will be calculated on a cash
basis and will be equal to all revenue received by the Company during the applicable period less all Company expenses (including
without limitation, salaries, benefits, and travel expenses, etc.). A portion of the gross profits will be distributed as a bonus
according to the following formula:

 

		a.	Thirty percent (30%) of the gross profits of the EU operations will be the first part of the bonus pool. The employee will
receive 70% of the Oss share of this bonus pool. The Oss share of the bonus pool will be calculated as the total revenue of the
Oss group divided by the total revenue of EU operations times the bonus pool (bonus pool * Oss revenue/ EU revenue). For the bonus
allocation, revenue is counted once the invoices have been paid by the client.

 

		b.	Thirty percent (30%) of the gross profits of the worldwide operations will be the second part of the bonus pool. The employee
will receive 6% of this bonus pool.

 

		3.	The formula according to which the gross profits will be distributed as a bonus will be determined
on a year-to-year basis. Qualifying for determination of the Bonus are the accounts of the Employer, to the exclusion of everything
else.

 

Article 9 Obligation
to confidentiality

 

In connection with the obligation to confidentiality
Employer refers to the annex which is attached to this contract of employment.

 

Article 10 Obligation
to hand in company property

 

If Employee is suspended or the contract
of employment ends in any other way or for any other reason, or at the Employer’s first request, the Employee is obliged
to give the Employer immediately all that which he has in his possession for the Employer in relation to or in connection with
the present agreement, including computers, keys, items, documents, copies hereof and all other items that the Employer has provided
him with.

 

Article 11 Ban on additional
jobs

 

The Employee is forbidden from engaging
in paid or unpaid (additional) jobs for third parties during the term of the contract of employment which may be/are detrimental,
or compete with the Employer’s interests, unless the Employer gives written permission to do so.

 

Article 12 Penalty clause

 

If the Employee acts contrary to its obligations
on account of that stated in the Articles 9 (confidentiality), including the annex and/or 10 (obligation to hand in company property)
and/or 11 (ban on additional jobs) of this contract, he will, contrary to Article 7:650, paragraph 3 of the Dutch Civil Code, forfeit
to the Employer, without any notice of default being required, a penalty of € 4,500.00 for each violation, and a penalty of
 € 450.00 for each day that the violation persists, without prejudicing the Employer's right to claim full compensation plus
costs and interest instead, in so far as the damage actually suffered exceeds the stipulated penalty.

 

	Employer’s initials:
	 	Employee’s initials:
/s/ TK

 

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Quantitative Solutions BV Confidential

 

Article 13 Applicable
law and competent court

 

		1.	This contract and the resulting contracts are governed by Dutch law.

 

		2.	Any disputes which result from the present contract will be settled by the competent court in Breda.

 

Article 14 Other provisions

 

		1.	This contract applies equally to male and female employees.

 

		2.	Changes and additions to this contract of employment can only be legally made in the form of a
written agreement signed by both parties which is to be attached to this contract of employment and which is regarded as being
an inextricable part thereof. On the grounds of Article 7:611 of the Dutch Civil Code the Employee as well as the Employer will
respond positively to reasonable proposals for changes to the contract of employment.

 

		3.	Changes or additions to this contract as a consequence of changed fiscal, social insurance law
and/or employment law regulations, about which the Employer notifies the Employee in writing, will be regarded as having been accepted
by the Employee.

 

		4.	The Employer is also authorized to change the terms and conditions of employment if the Employer
has an interest in the change which is so considerable that, based on criteria of reasonableness and fairness, the Employee's interest
has to yield. The change takes effect at the moment that it is communicated to the Employee.

 

		5.	Nullity of one or more provisions in this contract of employment will not result in nullity of
the other provisions. In relation to provisions for which one of the parties has invoked nullity, the parties undertake to consult
immediately.

 

		6.	Signing this contract of employment causes all previous contracts and agreements relating to the
applicability of conditions to lapse.

 

Thus agreed and signed in duplicate in
Breda on 20 June 2014.

 

	Signed as correct:	 	Signed as correct:
	 	 	 
	The Employer	 	The Employee
	 	 	 
	On behalf of the above:	 	
	 	 	 
	 	 	/s/ Thomas Kerbusch
	Mr E.H. Cox	 	Mr. Thomas Kerbusch

 

	Employer’s initials:
	 	Employee’s initials:
/s/ TK

 

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Quantitative Solutions BV Confidential

 

Addendum-1:

Job Description Managing Director Europe

 

		·	Is a part of the executive committee of the company

		·	Is responsible for managing all European business operations

		·	Is capable to perform a Mentor consulting role:

		1.	Provides expert scientific and strategic input on development programs, including review of development
strategy, regulatory filing strategy, and guidance on ACM preparation.

		2.	Able to mentor internal staff of client on how to identify and formulate key questions facing development
teams.

		3.	Able to mentor internal staff on developing and executing PK/PD and M&S strategies to inform
key decisions (e.g. dose selection, go/no-go).

		4.	Advices and reviews on CSRs, CTD, M&S reports, etc. from inception to final version.

		5.	Strategic advice and consultancy in development of internal PKPD/M&S capabilities, organization
and infrastructure.

		6.	May provide Expert Quantitative Pharmacology Consultancy and/or Modeling Consultancy.

 

	Employer’s initials:
	 	Employee’s initials:
/s/ TK

 

    6Exhibit 10.17

 

SUBJECT TO COMPLETION OF THE ENVISAGED TRANSACTION

 

ADDENDUM TO THE CONTRACT OF EMPLOYMENT
FOR AN INDEFINITE PERIOD

OF TIME DATED 20 JUNE 2014

 

THE UNDERSIGNED PARTIES,

 

		1.	The private company with limited liability Quantitative Solutions B.V., established in (4818
SJ) Breda at Parkstraat 1-B, legally represented in this matter by Benjamin Management B.V., established in (4835 PT) Breda at
Prins Hendrikstraat 174, which company is legally represented in this matter by Mr E.H. Cox, hereinafter to be referred to as “the
Employer”;

 

and

 

		2.	Mr Th. Kerbusch, residing at [                ], the Netherlands, hereinafter referred to as “the
Employee”;

 

WHEREAS:

 

		a)	Certara USA, Inc. (“the Company”) has entered into a Sale and Purchase Agreement
with all of the owners of the Target and the Target (“Purchase Agreement”), pursuant to which the Company will acquire
all of the outstanding and issued shares of Target and its direct and indirect subsidiaries including Quantitative Solutions, LP,
Quantitative Solutions Coöperatief U.A. and Quantitative Solutions BV (collectively with the Target, the “Acquired Entities”)
(the “Transaction”);

 

		b)	the definitions used in this addendum are the definitions as used in the Purchase Agreement or
as defined as such in this addendum.

 

Clause 1 - Non-Compete, Business Relationship
and Non-Solicitation Clause

 

		1.1	Unless the Employer’s prior written permission has been obtained, the Employee may not during
the contract of employment and for 12 months after the end of this contract of employment, regardless of how and why this employment
ended:

 

		a)	the Employee shall not, directly or indirectly, engage in or assist others in engaging in a Competing
Business anywhere in the world. Notwithstanding the foregoing, the Employee may own, directly or indirectly, solely as a passive
investment, securities of any Person traded on any national securities exchange or in the over the counter market if the Employee
is not a controlling Person of or a member of a group which controls, such Person and does not, directly or indirectly, own 2%
or more of any class of securities of such Person. For the purposes of this Clause 1.1. any reference to Competing Business includes
a reference to any expansion or innovation of the business actually commenced or fully developed, but not yet marketed by the Acquired
Entities or the Company or its affiliates at the date the contract of employment is terminated.

 

It shall not be a violation of
this Clause 1.1. under a) if the Employee works for a pharmaceutical company or an academic institution of higher education even
if engaged in a business that is competitive with the Acquired Entities;

 

		b)	the Employee shall not, directly or indirectly, (i) knowingly solicit or interfere with the
relationship between the Company or any of its affiliates (which includes the Acquired Entities), on the one hand, and any of their
customers, suppliers, employees or other business relations, on the other hand; and/or

 

    

     

    

 

		c)	hire or offer employment to any person who was employed by any of the Company or any of its affiliates
(which includes the Acquired Entities) at any time during the twelve (12) months prior to the termination of Employee’s employment
hereunder.

 

“Competing Business”
means, on a world-wide basis, any business or trade carried on by the Company or any of its affiliates during the term of employment.

 

Clause 2 - Breach

 

		2.1	Should the Employee breach any of the obligations set forth in Clause 1.1 of this contract of employment,
the Employee will promptly forfeit to the Employer, an immediately payable penalty of EUR 4,500, which amount will increase by
EUR 450 for each day that the breach continues, without prejudice to the Employer’s right to demand performance of this contract
of employment. Instead of imposing a penalty, the Employer may, without issuing a notice of default, claim full damages.

 

		2.2	Payment of the penalty referred to in this clause will not release the Employee from the obligations
contained in Clause 1.1 of this contract.

 

		2.3	Any breach by the Employee of the obligations set forth in Clause 1.1 will constitute an urgent
reason on the grounds of which the Employer may terminate this contract of employment with immediate effect.

 

		2.4	Paragraphs 3, 4 and 5 of Section 7:650 of the Dutch Civil Code do not apply to this contract
of employment.

 

Clause 3 - Severance

 

		3.1	Only if the Employee’s contract for employment has been terminated by the Employer without
Cause or by the Employee for Good Reason, the Employer will award a compensation consisting of a base gross monthly salary and
holiday allowance (not including fringe benefits) equal to the 12 months. The Employer and the Employee acknowledge that the compensation
mentioned in this Clause 3.1 does include any form of transition payment (in Dutch: “transitievergoeding”) to the extent
that the Employee at some point in time would be eligible for or is awarded such transition payment as a result of the (form
of) termination of the contract of employment. Therefore, if and to the extent that the Employee is awarded a transition payment,
payment of this transition payment shall be deducted from the compensation as mentioned in this Clause 3.1.

 

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“Cause”
means (i) Employee’s conviction of, or plea of nolo contendere to, a felony or to any other crime involving fraud, dishonesty
or breach of trust, (ii) Employee’s gross negligence or intentional misconduct in the performance of Employee’s
duties to the Employer, Employee’s the repeated or intentional failure to perform at a standard reasonably expected of an
employee in Employee’s position with the Employer, or Employee’s failure to devote Employee’s full business time
to the Employer, (iii) Employee’s fraud or willful dishonesty or misrepresentation intended to result in direct or indirect
gain or personal enrichment at the expense of the Employer or its equity holders, (iv) Employee’s public or consistent
drunkenness or illegal use of narcotics that is reasonably likely to become materially injurious to the reputation or business
of the Employer or that is reasonably likely to impair Employee’s performance of duties to the Employer, (v) the repeated
or intentional failure of the Employee to follow the reasonable directions of the Board or the individual(s) to whom such
Employee reports, following notice to the Employee and a reasonable opportunity to cure such repeated failure, or (iv) any
other intentional conduct of Employee that materially injures the Employer or its reputation including but not limited to knowingly
participating or allowing accounting or tax improprieties, embezzlement or theft.

 

“Good
Reason” means (a) a material diminution in Employee’s authority, duties, or responsibilities, (b) the principal
place of employment of the Employee is relocated to any location which is outside of a 50 kilometers radius of the employment location
or (c) a material reduction in Employee’s base salary, other than as part of a reduction plan affecting all of the Employer’s
leadership team that is instituted as a result of economic circumstances; provided that Good Reason shall not exist unless (i) within
twenty (20) days after the occurrence of such act the Employee gives written notice to the Employer stating that such act constitutes
Good Reason, is not acceptable to the Employee, and requesting that the Employer cure such act and (ii) the Employee terminates
his or her employment with the Employer within ninety (90) days after delivery of such notice.

 

Clause 4 - Other terms and conditions

 

		4.1	The other terms and conditions of the contract of employment signed on 20 June 2014 remain
in full force and effect.

 

[Remainder of page intentionally
left blank; signature page to follow]

  

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	QUANTITATIVE SOLUTIONS B.V.	 	EMPLOYEE
	 	 	 
	Agreed:	 	Agreed:
	 	 	 
	/s/ Edmundo Muniz 	 	/s/ Thomas Kerbusch 
	On behalf of Quantitative Solutions B.V., solely authorised
director 	 	By: Thomas Kerbusch 
	By: Edmundo Muniz 	 	Date: 30 June 2015
	Title: Managing Director 	 	 
	Date:	 	 

 

(Signature page to Addendum to Contract of Employment for
an Indefinite Period of Mr. Kerbusch)

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