Document:

EX-10.1

Execution Version

AMENDMENT NO. 1 TO TERM LOAN CREDIT AGREEMENT

dated as of

June 9, 2016,

among

MKS INSTRUMENTS, INC.,

as the Borrower,

the other Loan Parties party hereto,

the Participating Lenders party hereto,

BARCLAYS BANK PLC,

as Administrative Agent,

and

BARCLAYS BANK PLC and DEUTSCHE BANK SECURITIES INC.,

as Joint Lead Arrangers and Joint Bookrunners

1

AMENDMENT NO. 1 TO TERM LOAN CREDIT AGREEMENT

This AMENDMENT NO. 1 TO TERM LOAN CREDIT AGREEMENT, dated as of June 9, 2016 (this
“Agreement”), by and among MKS Instruments, Inc., a Massachusetts corporation (the
“Borrower”), the other Loan Parties party hereto, Barclays Bank PLC, as the administrative
agent and the collateral agent (in such capacity, the “Administrative Agent”) under the
Credit Agreement referred to below, and each Participating Lender (as defined below) party hereto.

RECITALS:

WHEREAS, reference is made to the Term Loan Credit Agreement, dated as of April 29, 2016 (as
amended, restated, amended and restated, supplemented or otherwise modified from time to time, the
“Credit Agreement”), among the Borrower, the Lenders from time to time party thereto and
the Administrative Agent (capitalized terms used but not defined herein having the meaning provided
in the Credit Agreement), pursuant to which the Lenders provided the Borrower with Term Loans in an
aggregate initial principal amount of $780,000,000 (the “Initial Term Loans”);

WHEREAS, this Agreement constitutes a Refinancing Amendment, and the Borrower is hereby
notifying the Administrative Agent that it is requesting the establishment of Other Term
Commitments and/or Other Term Loans, in each case, pursuant to Section 2.15 of the Credit
Agreement;

WHEREAS, the Borrower requests Other Term Loans in an aggregate principal amount of
$730,000,000 (the “Tranche B-1 Term Loans”; the commitments in respect of such Tranche B-1
Term Loans, the “Tranche B-1 Term Commitments”; and the Participating Lenders with Tranche
B-1 Term Commitments and any permitted assignees thereof, the “Tranche B-1 Lenders”), which
will be available on the Amendment No. 1 Effective Date (as defined below) to refinance all
existing Initial Term Loans outstanding under the Credit Agreement immediately prior to
effectiveness of this Agreement (the “Existing Loans”) and which Tranche B-1 Term Loans
shall constitute Other Term Loans and Term Loans (as applicable) for all purposes of the Credit
Agreement and the other Loan Documents; it being understood that the aggregate principal amount of
the Existing Loans immediately prior to effectiveness of this Agreement is $730,000,000;

WHEREAS, each Lender holding Existing Loans under the Credit Agreement immediately prior to
effectiveness of this Agreement (each, an “Existing Lender”) executing and delivering a
notice of participation in the Tranche B-1 Term Loans in the form attached as Exhibit A
hereto (a “Tranche B-1 Participation Notice”) and electing the cashless settlement option
therein (each such Lender in such capacity and with respect to the Existing Loans so elected, a
“Converting Lender” and, together with each other Person executing and delivering a Tranche
B-1 Participation Notice or otherwise providing a Tranche B-1 Term Commitment, the
“Participating Lenders”) shall be deemed to have exchanged on the Amendment No. 1 Effective
Date the aggregate outstanding principal amount of its Initial Term Loans under the Credit
Agreement exchanged pursuant to this Agreement for an equal aggregate principal amount of Tranche
B-1 Term Loans under the Credit Agreement;

WHEREAS, the Borrower has appointed each of Barclays and Deutsche Bank Securities Inc.
(“DBSI”) to act, and each of Barclays and DBSI agrees to act, as joint lead arrangers and
joint bookrunners in respect of the Tranche B-1 Term Loans;

WHEREAS, Barclays, in its capacity as joint lead arranger and joint bookrunner (the “Lead
Arranger”), agrees to act as fronting bank for the syndication of the Tranche B-1 Term Loans
(in such capacity, the “Fronting Bank”), the Fronting Bank will purchase, and the Existing
Lenders will sell to the Fronting Bank, immediately prior to effectiveness of this Agreement, (i)
Initial Term Loans of Existing Lenders that do not execute and deliver a Tranche B-1 Participation
Notice (the “Non-Participating Lenders”) and (ii) Initial Term Loans of Existing Lenders
that execute and deliver a Tranche B-1 Participation Notice and elect the cash settlement option
therein (the “Non-Converting Lenders”) (the Loans described in the foregoing clauses (i)
and (ii), collectively, the “Reallocated Loans”);

WHEREAS, to the extent there exist any Reallocated Loans, the Fronting Bank shall be deemed to
exchange on the Amendment No. 1 Effective Date such Reallocated Loans on a cashless settlement
basis for an equal aggregate principal amount of Tranche B-1 Term Loans under the Credit Agreement,
and such Reallocated Loans shall promptly thereafter be purchased by Participating Lenders (other
than Existing Lenders) (the “New Lenders”), Non-Converting Lenders, and Existing Lenders
purchasing additional Tranche B-1 Term Loans, each in accordance with such Participating Lenders’
respective Tranche B-1 Participation Notice and as allocated by the Lead Arranger (with the consent
of the Borrower, not to be unreasonably withheld or delayed); and

WHEREAS, contemporaneously with the effectiveness of the Tranche B-1 Term Commitments the
Borrower wishes to (a) make certain amendments to the Credit Agreement to provide for the
incurrence of the Tranche B-1 Term Loans and (b) make certain other modifications to the Credit
Agreement set forth herein.

NOW, THEREFORE, in consideration of the premises and agreements, provisions and covenants
herein contained, the parties hereto agree as follows:

	1.	 	Credit Agreement Amendments. Effective as of the Amendment No. 1 Effective Date, the
Credit Agreement is hereby amended as follows:

	 	(a)	 	Section 1.1 of the Credit Agreement is amended by inserting the following new
definitions in their correct alphabetical order:

“Amendment No. 1” shall mean Amendment No. 1 to this Agreement,
dated as of June [9], 2016, among the Borrower, the other Loan Parties party
thereto, the Lenders party thereto, and the Administrative Agent.

“Amendment No. 1 Effective Date” shall mean the “Amendment No.
1 Effective Date” under and as defined in Amendment No. 1.

“Tranche B-1 Commitments” shall mean the “Tranche B-1 Term
Commitments” as defined in Amendment No. 1.

“Tranche B-1 Term Loans” shall mean the “Tranche B-1 Term
Loans” as defined in Amendment No. 1.

	 	(b)	 	The definition of “Applicable Margin” is hereby amended and restated in its
entirety as follows:

“ “Applicable Margin” means a percentage per annum equal to (i)
for Tranche B-1 Term Loans that are Eurodollar Loans, 3.50% and (ii) for
Tranche B-1 Term Loans that are Base Rate Loans, 2.50%.”.

	 	(c)	 	The definition of “Term Lender” is hereby amended and restated and replaced in
its entirety with the following:

“ “Term Lender” means, collectively, prior to the Amendment No. 1
Effective Date, each Lender identified on Schedule 2.01 as having a
Term Commitment on the Closing Date, the “Tranche B-1 Lenders” under
Amendment No. 1, and each Eligible Assignee which acquires a Term Loan
pursuant to Section 10.06(b) and their respective permitted
successors, in each case, other than any such Person that has ceased to be a
party hereto pursuant to an Assignment and Assumption.”.

	 	(d)	 	The definition of “Term Loans” is amended by adding the following proviso at
the end thereof:

“; provided that from and after the effectiveness of Amendment No.
1, “Term Loans” shall mean all Tranche B-1 Term Loans made on the Amendment
No. 1 Effective Date (through exchange or otherwise) pursuant to Amendment
No. 1.”.

	 	(e)	 	Section 2.01 of the Credit Agreement is hereby amended by adding the following
text at the end thereof:

“Subject to the terms and conditions hereof, each Lender with a Tranche B-1
Commitment severally agrees to make and/or exchange, on the Amendment No. 1
Effective Date, a Tranche B-1 Term Loan to the Borrower in Dollars in an amount
equal to such Lender’s Tranche B-1 Commitment. The aggregate principal amount of
Tranche B-1 Commitments as of the Amendment No. 1 Effective Date for all Lenders is
$730,000,000. The Borrower may make only one borrowing under the Tranche B-1
Commitments, which shall be on the Amendment No. 1 Effective Date. Each Lender’s
Tranche B-1 Commitment shall terminate immediately and without further action on the
Amendment No. 1 Effective Date after giving effect to the funding of such Lender’s
Tranche B-1 Commitment on such date.”.

	 	(f)	 	Section 2.07 of the Credit Agreement is amended by (x) deleting the word
“original” appearing before the text “aggregate principal amount” and (y) replacing the
text “Closing Date” with the text “Amendment No. 1 Effective Date”, in each case,
appearing therein.

	 	(g)	 	Section 2.08(f) of the Credit Agreement is amended by replacing the text
“Closing Date” with the text “Amendment No. 1 Effective Date”.

	3.	 	Tranche B-1 Term Loans. Subject to the terms and conditions set forth herein, each
Tranche B-1 Lender severally agrees to exchange Existing Loans for Tranche B-1 Term Loans
and/or make Tranche B-1 Term Loans to the Borrower in a single borrowing in Dollars on the
Amendment No. 1 Effective Date. The Tranche B-1 Term Loans shall be subject to the following
terms and conditions:

	 	(a)	 	Terms Generally. Other than as set forth herein, for all purposes under the
Credit Agreement and the other Loan Documents, the Tranche B-1 Term Loans shall have
the same terms as the Initial Term Loans and shall be treated for purposes of voluntary
and mandatory prepayments (including for scheduled principal payments) and all other
terms as Initial Term Loans.

	 	(b)	 	Proposed Borrowing. This Agreement represents a request by the Borrower to
borrow Tranche B-1 Term Loans from the Tranche B-1 Lenders as set forth on the
applicable Notice of Borrowing to be delivered by the Borrower under the Credit
Agreement.

	 	(c)	 	New Lenders. Each New Lender (i) confirms that it has received a copy of the
Credit Agreement and the other Loan Documents and the exhibits and schedules thereto,
together with copies of the financial statements referred to therein and such other
documents and information as it has deemed appropriate to make its own credit analysis
and decision to enter into this Agreement; (ii) agrees that it will, independently and
without reliance upon the Administrative Agent, the Collateral Agent, or any other
Lender and based on such documents and information as it shall deem appropriate at the
time, continue to make its own credit decisions in taking or not taking action under
the Credit Agreement; (iii) appoints and authorizes the Administrative Agent and the
Collateral Agent to take such action as agent on its behalf and to exercise such powers
under the Credit Agreement and the other Loan Documents as are delegated to the
Administrative Agent or the Collateral Agent, as the case may be, by the terms thereof,
together with such powers as are reasonably incidental thereto; and (iv) agrees that it
will perform in accordance with their terms all of the obligations which by the terms
of the Credit Agreement are required to be performed by it as a Lender, as the case may
be. Each New Lender acknowledges and agrees that it shall become a “Lender” under, and
for all purposes of, the Credit Agreement and the other Loan Documents, and shall be
subject to and bound by the terms thereof, and shall have all rights of a Lender
thereunder.

	 	(d)	 	Credit Agreement Governs. Except as set forth in this Agreement, the Tranche
B-1 Term Loans shall otherwise be subject to the provisions of the Credit Agreement and
the other Loan Documents.

	 	(e)	 	Exchange Mechanics.

	 	(i)	 	On the Amendment No. 1 Effective Date, upon the satisfaction or
waiver of the conditions set forth in Section 4 hereof, the outstanding amount
of Existing Loans of each Converting Lender exchanged pursuant to this
Agreement shall be deemed to be exchanged for an equal outstanding amount of
Tranche B-1 Term Loans under the Credit Agreement. Such exchange shall be
effected by book entry in such manner, and with such supporting documentation,
as may be reasonably determined by the Administrative Agent in its sole
discretion. It is acknowledged and agreed that each Converting Lender has
agreed to accept as satisfaction in full of its right to receive payment on the
outstanding amount of Existing Loans of such Converting Lender the conversion
of its Existing Loans into Tranche B-1 Term Loans in accordance herewith, in
lieu of the prepayment amount that would otherwise be payable by the Borrower
pursuant to the Credit Agreement in respect of the outstanding amount of
Existing Loans of such Converting Lender. Notwithstanding anything to the
contrary herein, each Converting Lender hereby waives any break funding
payments in respect of such Lender’s Initial Term Loans.

	 	(ii)	 	To the extent there exist any Reallocated Loans, (x) on the
Amendment No. 1 Effective Date, the Fronting Bank shall provide such
Reallocated Loans to the Borrower in the amount set forth opposite the Fronting
Bank’s name on Annex I hereto by purchase of Existing Loans in such amount and
exchange for Tranche B-1 Term Loans on a cashless settlement basis and (y)
promptly following the Amendment No. 1 Effective Date (but not later than 30
days following the Amendment No. 1 Effective Date (or such later date as may be
agreed to by the Fronting Bank in its sole discretion)), each New Lender, each
Non-Converting Lender and each Existing Lender purchasing additional Tranche
B-1 Term Loans shall purchase Reallocated Loans from the Fronting Bank as
directed by the Lead Arrangers in accordance with such Participating Lender’s
Tranche B-1 Participation Notice and as allocated by the Lead Arrangers.
Purchases and sales of Reallocated Loans shall be without representations from
the Fronting Bank other than as provided for in the relevant Assignment and
Assumption.

	4.	 	Effective Date Conditions. This Agreement will become effective on the date (the
“Amendment No. 1 Effective Date”), on which each of the following conditions have been
satisfied (or waived by the Lead Arrangers) in accordance with the terms therein:

	 	(a)	 	the Administrative Agent (or its counsel) shall have received from each of the
Borrower and the Participating Lenders, either (i) a counterpart of this Agreement
signed on behalf of such party or (ii) written evidence satisfactory to the
Administrative Agent (which may include facsimile or other electronic transmission of a
signed counterpart of this Agreement) that such party has signed a counterpart to this
Agreement (which, in the case of the Participating Lenders, may be in the form of a
Tranche B-1 Participation Notice);

	 	(b)	 	the Administrative Agent shall have received an executed Notice of Borrowing in
accordance with the terms hereof and Section 2.02 of the Credit Agreement;

	 	(c)	 	the Administrative Agent shall have received fully executed and delivered
Tranche B-1 Participation Notices from Participating Lenders and the Fronting Bank
representing 100% of the aggregate outstanding principal amount of the Existing Loans;

	 	(d)	 	the Administrative Agent shall have received a certificate of the Borrower
dated as of the Amendment No. 1 Effective Date signed by an Responsible Officer of the
Borrower (i) (A) certifying and attaching the resolutions or similar consents adopted
by the Borrower approving or consenting to this Agreement and the Tranche B-1 Term
Loans, (B) certifying that the certificate or articles of organization or formation and
by-laws or operating (or limited liability company) agreement of the Borrower either
(x) have not been amended since the Closing Date or (y) are attached as an exhibit to
such certificate, and (C) certifying as to the incumbency and specimen signature of
each officer executing this Agreement and any related documents on behalf of the
Borrower and (ii) certifying as to the matters set forth in clauses (g) and (h) below;

	 	(e)	 	the Administrative Agent shall have received, for the ratable account of each
Existing Lender, the full amount of any prepayment fee required to be paid by the
Borrower pursuant to Section 2.08(f) of the Credit Agreement;

	 	(f)	 	(i) the Administrative Agent shall have received all fees and other amounts
previously agreed to in writing by the Lead Arrangers and the Borrower to be due on or
prior to the Amendment No. 1 Effective Date, including, to the extent invoiced at least
two (2) Business Days prior to the Amendment No. 1 Effective Date (or such later date
as is reasonably agreed by the Borrower), including legal fees and expenses and the
fees and expenses of any other advisors in accordance with the terms of the Credit
Agreement and (ii) all accrued interest and fees in respect of the Existing Loans
outstanding immediately prior to effectiveness of this Agreement shall have been paid;

	 	(g)	 	the representations and warranties of the Borrower and the other Loan Parties
contained in Article V of the Credit Agreement and in any other Loan Document
shall be (x) in the case of representations and warranties qualified by “materiality,”
“Material Adverse Effect” or similar language, true and correct in all respects on the
Amendment No. 1 Effective Date and (y) in the case of all other representations and
warranties, true and correct in all material respects, in each case, on and as of the
Amendment No. 1 Effective Date, except to the extent that such representations and
warranties specifically refer to an earlier date, in which case they shall be true and
correct on the basis set forth above as of such earlier date;

	 	(h)	 	no Default or Event of Default shall exist on the Amendment No. 1 Effective
Date before or after giving effect to the effectiveness of this Agreement and the
incurrence of the Tranche B-1 Term Loans;

	 	(i)	 	the Administrative Agent shall have shall have received a solvency certificate
executed by a Financial Officer of the Borrower, substantially in the form of Exhibit K
to the Credit Agreement, dated and certifying as to solvency, in each case, as of the
Amendment No. 1 Effective Date; and

	 	(j)	 	the Loan Parties shall have provided the documentation and other information to
the Lenders required by regulatory authorities under the applicable
“know-your-customer” rules and regulations, including the Patriot Act, in each case at
least three (3) Business Days prior to the Amendment No. 1 Effective Date, as has been
requested to the Borrower in writing reasonably prior to the Amendment No. 1 Effective
Date.

	5.	 	Representations and Warranties. By its execution of this Agreement, each Loan Party
hereby represents and warrants that:

	 	(a)	 	such Loan Party has all requisite corporate or other organizational power and
authority execute, deliver and perform its obligations under this Agreement;

	 	(b)	 	the execution, delivery and performance by such Loan Party of this Agreement
(x) have been duly authorized by all necessary corporate, partnership, limited
liability company or other organizational action, and (y) do not and will not (i)
contravene the terms of any of such Loan Party’s Organization Documents, (ii) conflict
with or result in any breach or contravention of, or the creation of any Lien (other
than Permitted Liens) under, any Contractual Obligation to which such Loan Party is a
party or any order, injunction, writ or decree of any Governmental Authority or any
arbitral award to which such Person or its property is subject except in the case of
this clause (ii) any such conflict, breach or contravention that would not
reasonably be expected individually or in the aggregate to have a Material Adverse
Effect or (iii) violate any Law, except in any case for such violations that would not
reasonably be expected, individually or in the aggregate, to have a Material Adverse
Effect;

	 	(c)	 	this Agreement has been duly executed and delivered by each Loan Party that is
party hereto, and this Agreement constitutes a legal, valid and binding obligation of
such Loan Party, enforceable against each Loan Party that is party thereto in
accordance with its terms, except (i) as such enforceability may be limited by
applicable bankruptcy, insolvency, examinership, reorganization, moratorium or similar
laws affecting the enforcement of creditors’ rights generally and (ii) that rights of
acceleration and the availability of equitable remedies may be limited by equitable
principles of general applicability (regardless of whether enforcement is sought by
proceedings in equity or at law); and

	 	(d)	 	both immediately before and after giving effect to the Amendment No. 1
Effective Date and the incurrence and/or exchange of the Tranche B-1 Term Loans, (i)
the representations and warranties contained in the Credit Agreement and in the other
Loan Documents shall be (x) in the case of representations and warranties qualified by
“materiality,” “Material Adverse Effect” or similar language, true and correct in all
respects on the Amendment No. 1 Effective Date and (y) in the case of all other
representations and warranties, true and correct in all material respects, in each
case, on and as of the Amendment No. 1 Effective Date, except to the extent that such
representations and warranties specifically refer to an earlier date, in which case
they shall be true and correct on the basis set forth above as of such earlier date and
(ii) no event shall have occurred and be continuing or would result from the
consummation of this Agreement that would constitute an Event of Default.

	6.	 	Use of Proceeds. The Borrower covenants and agrees that it will use the proceeds of
the Tranche B-1 Term Loans to prepay in full the aggregate principal amount of Existing Loans
outstanding on the Amendment No. 1 Effective Date and to pay any interest, fees and/or
expenses related thereto.

	7.	 	Reaffirmation of the Loan Parties; Reference to and Effect on the Credit Agreement and
the other Loan Documents.

	 	(a)	 	Each Loan Party hereby consents to the amendment of the Credit Agreement
effected hereby and confirms and agrees that, notwithstanding the effectiveness of this
Agreement, each Loan Document to which such Loan Party is a party is, and the
obligations of such Loan Party contained in the Credit Agreement, this Agreement or in
any other Loan Document to which it is a party are, and shall continue to be, in full
force and effect and are hereby ratified and confirmed in all respects, in each case as
amended by this Agreement. For greater certainty and without limiting the foregoing,
each Loan Party hereby confirms that the existing security interests granted by such
Loan Party in favor of the Senior Credit Parties pursuant to the Loan Documents in the
Collateral described therein shall continue to secure the obligations of the Loan
Parties under the Credit Agreement and the other Loan Documents as and to the extent
provided in the Loan Documents. Except as specifically amended by this Agreement, the
Credit Agreement and the other Loan Documents shall remain in full force.

	 	(b)	 	The execution, delivery and performance of this Agreement shall not constitute
a waiver of any provision of, or operate as a waiver of any right, power or remedy of
any Agent or Lender under, the Credit Agreement or any of the other Loan Documents.

	 	(c)	 	On and after the Amendment No. 1 Effective Date, each reference in the Credit
Agreement to “this Agreement”, “hereunder”, “hereof”, “herein” or words of like import
referring to the Credit Agreement, and each reference in the other Loan Documents to
the “Credit Agreement”, “thereunder”, “thereof” or words of like import referring to
the Credit Agreement shall mean and be a reference to the Credit Agreement as amended
by this Agreement.

	8.	 	Prepayment Notice. The Participating Lenders and the Fronting Bank party hereto,
which constitute the Required Lenders, and the Administrative Agent hereby waive the
requirement under Section 2.08(d) of the Credit Agreement to provide notice to the
Administrative Agent not less than three (3) Business Days prior to the prepayment of the
Initial Term Loans to be made hereunder. It is understood and agreed that this Agreement
shall serve as the notice referred to in Section 2.08(d) of the Credit Agreement.

	9.	 	Request for Borrowing. Pursuant to this Agreement, the Borrower hereby requests a
Borrowing of Tranche B-1 Term Loans in an aggregate principal amount of $730,000,000, with
such Borrowing to be made on the Amendment No. 1 Effective Date and to have an Interest Period
ending on June 30, 2016 (and, notwithstanding anything to the contrary herein, each
Participating Lender hereby consents to such non-conforming Interest Period).

	10.	 	Notice. For purposes of the Credit Agreement, the initial notice address of each New
Lender shall be as separately identified to the Administrative Agent.

	11.	 	Tax Forms. For each New Lender, solely to the extent relevant and applicable,
delivered herewith to the Administrative Agent are such forms, certificates or other evidence
with respect to United States federal income tax withholding matters as such New Lender may be
required to deliver to the Administrative Agent pursuant to Section 3.01(f) of the Credit
Agreement.

	12.	 	Recordation of the New Loans. Upon execution and delivery hereof, the Administrative
Agent will record the Tranche B-1 Term Loans made by each Participating Lender in the
Register.

	13.	 	Amendment, Modification and Waiver. This Agreement may not be amended, modified or
waived except as permitted by Section 10.01 of the Credit Agreement.

	14.	 	Integration. This Agreement, the other Loan Documents and any separate letter
agreements with respect to fees payable to the Lead Arranger and/or the Administrative Agent
or the syndication of the Tranche B-1 Term Loans and commitments related thereto constitute
the entire contract among the parties relating to the subject matter hereof and supersede any
and all previous agreements and understandings, oral or written, relating to the subject
matter hereof. This Agreement shall not constitute a novation of any amount owing under the
Credit Agreement and all amounts owing in respect of principal, interest, fees and other
amounts pursuant to the Credit Agreement and the other Loan Documents shall, to the extent not
paid or exchanged on or prior to the Amendment No. 1 Effective Date, continue to be owing
under the Credit Agreement or such other Loan Documents until paid in accordance therewith.

	15.	 	Severability. The provisions of Section 10.12 of the Credit Agreement are hereby
incorporated by reference, mutatis mutandis, as if originally made a part hereof.

	16.	 	GOVERNING LAW; JURISDICTION; SERVICE OF PROCESS; WAIVER OF JURY TRIAL. THE
PROVISIONS OF SECTION 10.13 OF THE CREDIT AGREEMENT ARE HEREBY INCORPORATED BY REFERENCE,
MUTATIS MUTANDIS, AS IF ORIGINALLY MADE A PART HEREOF.

	17.	 	Counterparts. This Agreement may be executed in counterparts (and by different
parties hereto in different counterparts), each of which shall constitute an original, but all
of which when taken together shall constitute a single contract. Delivery of an executed
counterpart of a signature page of this Agreement by telecopier shall be effective as delivery
of a manually executed counterpart of this Agreement.

	18.	 	Loan Document. On and after the Amendment No. 1 Effective Date, this Agreement shall
constitute a “Loan Document” for all purposes of the Credit Agreement and the other Loan
Documents (it being understood that for the avoidance of doubt this Agreement may be amended
or waived by the parties hereto solely as set forth in Section 13 above).

	 	 	[Signature Pages Follow]

IN WITNESS WHEREOF, each of the undersigned has caused its duly authorized officer to execute
and deliver this Agreement as of the date first set forth above.

MKS INSTRUMENTS, INC.

	 	 	 
	By:

	 	/s/ Seth H. Bagshaw
	
 
	 	 
	
 
	 	Name: Seth H. Bagshaw

Title: Vice President and CFO

	 	 	NEWPORT CORPORATION,

	 	 	 
	By:

	 	/s/ Seth H. Bagshaw
	
 
	 	 
	
 
	 	Name: Seth H. Bagshaw

Title: Vice President and CFO

	 	 	BARCLAYS BANK PLC, as Administrative Agent

	 	 	 
	By:

	 	/s/ Robert Chen
	
 
	 	 
	
 
	 	Name: Robert Chen

Title: Managing Director

2

	 	 	BARCLAYS BANK PLC, as Fronting Bank

	 	 	 
	By:

	 	/s/ Robert Chen
	
 
	 	 
	
 
	 	Name: Robert Chen

Title: Managing Director

EXHIBIT A

Form of Tranche B-1 Participation Notice

Date: [__], 2016

Barclays Bank PLC, as Administrative Agent

700 Prides Crossing

Newark, DE 19713

Attn: Tim O’Connell

Phone: (302) 286-2355

Fax: (214) 545-5230

Email: timothy.o’connell@barclays.com

MKS Instruments, Inc.

Tranche B-1 Participation Notice

Ladies and Gentlemen:

Reference is made to Amendment No. 1 (the “Amendment”) to that certain Term Loan
Credit Agreement, dated as of April 29, 2016 (as amended by the Amendment and as otherwise may be
amended, restated, amended and restated, supplemented or otherwise modified from time to time, the
“Credit Agreement”), by and among MKS Instruments, Inc., a Massachusetts corporation (the
“Borrower”), the Lenders from time to time party thereto, Barclays Bank PLC, administrative
agent (in such capacity, the “Administrative Agent”). Unless otherwise specified herein,
capitalized terms used but not defined herein are used as defined in the Amendment.

By delivery of this Tranche B-1 Participation Notice, each of the undersigned (each a
“Participating Lender”), hereby irrevocably consents to the Amendment and the amendment of
the Credit Agreement contemplated thereby and (check as applicable):

Name of Participating Existing Lender:       

Cashless Settlement Option. Hereby (i) elects, upon the Amendment No. 1 Effective
Date, to exchange the full amount of the outstanding Initial Term Loans of such
Participating Lender for an equal outstanding amount of Tranche B-1 Term Loans under
the Credit Agreement and (ii) represents and warrants to the Administrative Agent
that it has the organizational power and authority to execute, deliver and perform
its obligations under this letter agreement and the Amendment (including, without
limitation, with respect to any exchange contemplated hereby) and has taken all
necessary corporate and other organizational action to authorize the execution,
delivery and performance of this letter agreement and the Amendment.

Cash Settlement Option. Hereby (i) elects to have the full amount of the
outstanding Initial Term Loans of such Participating Lender repaid or purchased and
agrees to promptly (but in any event, on or prior to the date that is 30 days
following the Amendment No. 1 Effective Date) purchase an equal amount of Tranche
B-1 Term Loans and (ii) represents and warrants to the Administrative Agent that it
has the organizational power and authority to execute, deliver and perform its
obligations under this letter agreement and the Amendment (including, without
limitation, with respect to any exchange contemplated hereby) and has taken all
necessary corporate and other organizational action to authorize the execution,
delivery and performance of this letter agreement and the Amendment.

Notwithstanding anything to the contrary, each undersigned Lender hereby agrees to
waive its right to compensation for any amounts owing under Sections 3.02 or 3.03 of
the Credit Agreement.

[Signature Page Follows]

Very truly yours,

	 	 	 
	      ,
	By:
	 	

	 	 	Name:

	 	 	Title:

	By:
	 	

	 	 	Name:

	 	 	Title:

3

ANNEX I

REALLOCATED LOANS

	 	 	 	 	 
	Barclays Bank PLC
	 	$	67,595,124.63	 
	 
	 	 	 	 

4Exhibit

Exhibit 10.1

Doug Merritt 
CEO & President 
250 Brannan Street                           
San Francisco, CA 94107

March 3, 2016
Ms. Susan St. Ledger 
c/o Splunk Inc.
250 Brannan Street
San Francisco, CA 94107

Re:    Your Splunk Employment Offer

Dear Susan:

I am thrilled and delighted to offer you the position of Senior Vice President, Chief Revenue Officer of Splunk Inc. (“the Company”), reporting to me.  We are all very excited to have you join the team.  In your role, you will have the opportunity to make a meaningful impact upon our future success.  Understandably, this offer is contingent upon you fully cooperating with, and successfully completing, background and reference checks, including completing and returning the enclosed Director and Officer Questionnaire.  Here are the terms of our proposed agreement (the “Agreement”):

1.Annual Salary; Executive Bonus.  Your gross base salary will be $400,000 per year and you will be paid semi-monthly at a rate of $16,666.67, less applicable deductions and withholdings. In addition, you will participate in Splunk's Executive Bonus Plan and you will be eligible to earn an annual bonus of 100% of your base salary at target, based on actual achievement of Company financial goal(s), as determined by the Compensation Committee of our Board of Directors (“Compensation Committee”), and pro-rated as of the Effective Date (defined below).  Your annual on target earnings initially will be $800,000. Under current practices (which may change in the future), you will be paid a mid-fiscal-year bonus of up to 50% of your annual bonus at target but pro-rated for the time you have worked during the fiscal year.  Any mid-fiscal-year bonus will be based on the Company's actual achievement of financial performance metrics through the end of the fiscal second quarter.  Your mid-fiscal-year bonus will be included in the calculation of your annual bonus and your year-end bonus payment will be equal to your calculated annual bonus, less any mid-fiscal-year bonus paid for that fiscal year.  The year-end bonus payment will be made approximately 45 days after the completion of the fiscal year and after the Compensation Committee's review and approval of executive bonuses.  Note that all payments to you will be made after applicable withholdings.

2.Fiscal Year 2017 Discretionary Bonus.  In addition to the compensation set forth above, you shall be eligible to receive a discretionary bonus of up to $75,000 based upon your achievement in fiscal year 2017 of individual qualitative performance measures, including an increase in the number of customers, deployment of programs that result in broad adoption of our products  and services, an increase in revenue from outside the United  States, continued increase in high quality partner velocity and contribution, and other projects to be assigned by me. At the conclusion of fiscal year 2017, I will make an assessment of your performance and a recommendation to the Compensation Committee, which will have final authority to approve payments.

3.Start Date.  Your start date will be May 2, 2016 (the “Effective Date”)

4.Benefits.  You will be eligible to participate in the healthcare, 40l(k), employee stock purchase and other employee benefit plans established for our employees.  You will be entitled to 15 days or such other amount as your manager may approve of Paid Time-Off (PTO) annually, accrued on a semi-monthly basis in accordance with Company policy.  You are also authorized to fly business class while on Company business.

5.Equity. We will recommend to the Compensation Committee that you be granted 68,000 Restricted Stock Units (RSUs) and 102,000 Performance Stock Units (PSUs).  The RSUs will vest over approximately 4 years with 25% of the RSUs vesting on or about June 10, 2017 and 1/16th of the RSUs vesting quarterly thereafter as specified in 

your RSU agreement, so long as you remain employed by the Company. The number of earned PSUs will be determined on or about March 2017 based upon achievement of performance metrics to be established by the Compensation Committee in March 2016.  To the extent earned, PSUs will vest over approximately 4 years with 25% of the PSUs vesting on or about June 10, 2017.  The remaining PSUs will vest quarterly thereafter as specified in your PSU agreement, so long as you remain employed by the Company.

6.Confidentiality.  As an employee of the Company, you will have access to confidential information of the Company and certain third parties and you may, during the course of your employment, create inventions, improvements designs, original works of authorship, computer software programs, trade secrets and other matters that will be the sole and exclusive property of the Company.  You hereby irrevocably assign each such invention, work and matter to the Company.  As a condition of employment, you are required to comply with the terms of the Company’s “Employee Invention Assignment and Confidentiality Agreement,” which is attached to this Agreement.  We wish to impress upon you that the Company does not want you to, and we hereby direct you not to, bring with you or use on behalf of the Company, any confidential or proprietary material or information of any former employer or other third party.  In addition, you must not violate any other obligation you may have to any former employer or other third party.  During the period that you render services to the Company, you agree you will not engage in any employment, business or activity that is in any way competitive with the business or proposed business of the Company.  You will disclose to the Company, in writing, any other gainful employment, business or activity that you are currently associated with or participate in that competes with the Company and that you become associated with during the period that you render services to the Company.  You will not assist any other person or organization in competing with the Company or in preparing to engage in competition with the business or proposed business of the Company.  By signing this Agreement you certify that your employment with the Company will not violate any contractual or other legal obligation that would prohibit or limit you from performing your duties to the Company.

7.At-Will Employment.  During your entire employment you will be an at-will employee of the Company, which means the employment relationship can be terminated by either of us for any reason, at any time, with or without prior notice and with or without Cause (defined below).  Your participation in any equity or benefit program does not assure you of continuing employment for any particular period of time.  Any modification or change in your at-will employment status may only occur by way of a written agreement signed by you and the Chief Executive Officer of the Company.

8.Severance.  We will recommend to the Compensation Committee that you also receive the following severance benefits.

(a)Separation in Event of Termination Within the 3-Month Period Before or 12-Month Period Following a Change in Control.  In the event of your involuntary separation from employment with the Company without Cause or for Good Reason (defined below), in each case within the period that begins after the signing of a definitive agreement that ultimately results in a Change in Control within three (3) months of  its signing or within twelve (12) months following a Change in Control (“Change in Control Period”), then, in addition to any accrued compensation, and provided that you deliver to the Company a signed release of claims in favor of the Company (“Release”), and satisfy all conditions to make the Release effective within sixty (60) days following your separation from service, you shall be entitled to the benefits as set forth below:

(i)Lump sum payment equal to twelve (12) months of your then-current base salary, plus a pro-rated portion of your annual target bonus for the time you are actively employed in the year of termination;

(ii)Provided you timely elect to continue health coverage under COBRA, reimbursement for any monthly COBRA premium payments made by you in the twelve (12) months following your separation from service.  If at the time you separate from service, it would result in a Company excise tax to reimburse you for COBRA premiums, then no such premiums will be reimbursed and if doing so would not cause imposition of an excise tax, you will be paid a single lump sum of $24,000; and

(iii)Acceleration of vesting as to all then-unvested shares or rights subject to all equity awards which have been granted to you.  You shall have six (6) months following your separation from service from the Company in which to exercise any stock options that have been granted to you.

(b)Severance in Event of Termination Without Cause Outside the Change in Control Period.  In the event of your involuntary separation from employment with the Company without Cause not during the Change 

in Control Period, then, in addition to any accrued compensation, and provided that you deliver to the Company a signed Release and satisfy all conditions to make the Release effective within sixty (60) days following your separation from service, you shall be entitled to benefits as set forth below:

(i)Lump sum payment equal to six (6) months of your then-current base salary, plus a pro-rated portion of your annual target bonus for the time you are actively employed in the year of termination;

(ii)Provided you timely elect to continue health coverage under COBRA, reimbursement for any monthly COBRA premium payments made by you in the six (6) months following your separation from service.  If at the time you separate from service,  it would result in a Company excise tax to reimburse you for COBRA premiums then no such premiums will be reimbursed and if doing so would not cause imposition of an excise tax, you will be paid a single lump sum of $12,000; and

(iii)Acceleration of vesting as to a number of shares or rights subject to all equity awards which have been granted to you as would have vested in the six (6) months following your separation from service.  You shall have six (6) months following your separation from service from the Company in which to exercise any vested options that have been granted to you.

9.Section 409A Matters.

(a)For purposes of this Agreement, no payment will be made to you upon termination of your employment unless such termination constitutes a “separation from service” within the meaning of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), and Section 1.409A-l(h) of the regulations promulgated thereunder.

(b)To the extent any payments to which you become entitled under this agreement, or any agreement or plan referenced herein, in connection with your separation from service from the Company constitute deferred compensation subject to Section 409A of the Code (the “Deferred Payments”), such payments will be paid on, or in the case of installments, will not commence, until the sixtieth (60th) day following your separation from service, or if later, such time as required by Section 8(c).  Except as required by Section 8(c), any installment payments that would have been made to you during the sixty (60) day period immediately following your separation from service but for the preceding sentence will be paid to you on or around the sixtieth (60th) day following your separation from service and the remaining payments will be made as provided herein.

(c)If you are deemed at the time of such separation from service to be a “specified employee” under Section 409A of the Code, then any Deferred Payment(s) shall not be made or commence until the earliest of (i) the expiration of the six (6)-month period measured from the date of your “separation from service” (as such term is at the time defined in Treasury Regulations under Section 409A of the Code) with the Company or (ii) the date of your death following such separation from service; provided, however, that such deferral shall only be effected to the extent required to avoid adverse tax treatment to you, including (without limitation) the additional twenty percent (20%) tax for which you would otherwise be liable under Section 409A(a)(l)(B) of the Code in the absence of such deferral.  Upon the expiration of the applicable deferral period, any payments which would have otherwise been made during that period (whether in a single sum or in installments) in the absence of this paragraph shall be paid to you or your beneficiary in one lump sum.

(d)To the extent any payments to which you become entitled under this agreement, or any agreement or plan referenced herein, in connection with your separation from service from the Company constitute deferred compensation subject to Section 409A of the Code, you and the Company may make changes to this Agreement to avoid adverse tax consequences under Section 409A.  Each payment and benefit payable hereunder is intended to constitute a separate payment for purposes of Section 1.409A-2(b)(2) of the Treasury Regulations.

10.Definitions.

(a)Cause.  For purposes of this Agreement, “Cause” means (i) your conviction of or plea of nolo contendere to a felony or a crime involving moral turpitude which the Board believes has had or will have a detrimental effect on the Company's reputation or business, (ii) your engaging in an act of gross negligence or willful misconduct in the performance of your employment obligations and duties, (iii) your committing an act of fraud against, material misconduct or willful misappropriation of property belonging to the Company; (iv) your engaging in any other misconduct 

that has had or will have an adverse effect on the Company's reputation or business; or (v) your breach of the Employee Invention Assignment and Confidentiality Agreement or other unauthorized misuse of the Company's or a third party's trade secrets or proprietary information.

(b)Change in Control.  For purposes of this Agreement “Change in Control” means (i) a sale, conveyance, exchange or transfer (excluding any venture-backed or similar investments in the Company) in which any person or entity, other than persons or entities who as of immediately prior to such sale, conveyance, exchange or transfer own securities in the Company, either directly or indirectly, becomes the beneficial owner, directly or indirectly, of securities of the Company representing fifty (50%) percent of the total voting power of all its then-outstanding voting securities; (ii) a merger or consolidation of the Company in which its voting securities immediately prior to the merger or consolidation do not represent, or are not converted into securities that represent, a majority of the voting power of all voting securities of the surviving entity immediately after the merger or consolidation; or (iii) a sale of substantially all of the assets of the Company or a liquidation or dissolution of the  Company.

(c)Good Reason.  For purposes of this Agreement, “Good Reason” means any of the following taken without your written consent and provided (a) the Company receives, within thirty (30) days following the occurrence of any of the events set forth in clauses (i) through (iv) below, written notice from you specifying the specific basis for your belief that you are entitled to terminate employment for Good Reason, (b) the Company fails to cure the event constituting Good Reason within thirty (30) days after receipt of such written notice thereof,  and (c) you terminate your employment within thirty (30) days following expiration of such cure period: (i) a material change, adverse to you, in your position, title(s), office(s) or duties; (ii) an assignment of any significant duties to you that are inconsistent with your positions or offices held under this Agreement; (iii) a decrease in your then-current annual base salary by more than 10% (other than  in connection with a general decrease in the salary of all executives); or (iv) your relocation to a facility or a location more than thirty (30) miles from your  residence.

11.Authorization to Work.  As required by law, this offer of employment is contingent upon your providing legal proof of your identity and authorization to work in the United States within three (3) business days of starting your employment.

12.Policies.  You acknowledge that you have read and will comply with all Company policies, guidelines and processes in effect throughout your employment, including but not limited to the attached Company Code of Business Conduct and Ethics, Insider Trading Policy, Anticorruption Compliance Policy and Guidelines, and U.S.  Export Control Compliance Policy Statement.  You acknowledge that the Company may implement, modify or revoke Company policies, guidelines and processes from time to time, and you agree to read and comply with each then-current policy, guideline and/or process.

13.Arbitration.

(a)Arbitration.  In consideration of your employment with the Company, its promise to arbitrate all employment-related disputes, and your receipt of the compensation, pay raises, and other benefits paid to you by the Company, at present and in the future, you agree that any and all controversies, claims, or disputes with anyone (including the Company and any employee, officer, director, shareholder, or benefit plan of the Company, in their capacity as such or otherwise), arising out of: relating to, or resulting from your employment with the Company or the termination of your employment with the Company, including any breach of this Agreement, shall be subject to binding arbitration under the arbitration provisions set forth in California Code of Civil Procedure sections 1280 through 1294.2, including section 1281.8 (the “Act”), and pursuant to California law, and shall be brought in your individual capacity, and not as a plaintiff or class member in any purported class or representative proceeding.  The Federal Arbitration Act shall continue to apply with full force and effect notwithstanding the application of procedural rules set forth in the Act.  Disputes that you agree to arbitrate, and thereby agree to waive any right to a trial by jury, include any statutory claims under local, state, or federal law, including, but not limited to, claims under Title VII of the Civil Rights Act of 1964, the Americans with Disabilities Act of 1990, the Age Discrimination in Employment Act of 1967, the Older Workers Benefit Protection Act, the Sarbanes-Oxley Act, the Worker Adjustment and Retraining Notification Act, the California Fair Employment and Housing Act, the Family and Medical Leave Act, the California Family Rights Act, the California Labor Code, claims of harassment, discrimination, and wrongful termination, and any statutory or common law claims.  Notwithstanding the foregoing, you understand that nothing in this Agreement constitutes a waiver of your rights under section 7 of the National Labor Relations Act.  You further understand that this Agreement to arbitrate also applies to any disputes that the Company may have with you.

(b)Procedure.  You agree that any arbitration will be administered by Judicial Arbitration & 

Mediation Services, Inc. (“JAMS”), pursuant to its employment arbitration rules & procedures (the “JAMS rules”), which are available at http://www.jamsadr.com/rules­-employment-arbitration/ and from Human Resources.  You agree that the arbitrator shall issue a written decision on the merits.  You also agree that the arbitrator shall have the power to award any remedies available under applicable law.  You agree that the decree or award rendered by the arbitrator may be entered as a final and binding judgment in any court having jurisdiction thereof.  You understand that the Company will pay for any administrative or hearing fees charged by the arbitrator or JAMS except that you shall pay any filing fees associated with any arbitration that you initiate, but only so much of the filing fees as you would have instead paid had you filed a complaint in a court of law.  You agree that the arbitrator shall administer and conduct any arbitration in accordance with California law, including the California Code of Civil Procedure and the California Evidence Code, and that the arbitrator shall apply substantive and procedural California law to any dispute or claim, without reference to rules of conflict of law.  To the extent that the JAMS rules conflict with California law, California law shall take precedence.  You agree that any arbitration hearing under this Agreement shall be conducted in San Francisco County, California.

(c)Remedy.  Except as provided by the Act and this Agreement, arbitration shall be the sole, exclusive, and final remedy for any dispute between you and the Company.  Accordingly, except as provided for by the Act and this Agreement, neither you nor the Company will be permitted to pursue court action regarding claims that are subject to arbitration.

(d)Administrative relief.  This Agreement does not prohibit you from pursuing an administrative claim with a local, state, or federal administrative body or government agency that is authorized to enforce or administer laws related to employment, including, but not limited to, the Department of Fair Employment and Housing, the Equal Employment Opportunity Commission, the National Labor Relations Board, or the Workers' Compensation Board.  This Agreement does, however, preclude you from pursuing court action regarding any such claim, except as permitted by law.

(e)Voluntary nature of Agreement.  You acknowledge and agree that you are executing this Agreement voluntarily and without any duress or undue influence by the Company or anyone else.  You further acknowledge and agree that you have carefully read this Agreement and that you have asked any questions needed for you to understand the terms, consequences, and binding effect of this Agreement and fully understand it, including that you are waiving your right to a jury trial.  Finally, you agree that you have been provided an opportunity to seek the advice of an attorney of your choice before signing this Agreement.

14.Complete Agreement.  You understand and agree that after this Agreement is signed by you and the Company, this Agreement shall supersede any prior offer letter(s), employment agreement(s) and/or any addenda existing between the parties, whether written or verbal.  This Agreement can only be modified by a written agreement signed by you and the Chief Executive Officer of the Company.

15.Acceptance.  To accept this Agreement, please sign in the space indicated and return to me.  Your signature will acknowledge that you have read, understand and agree to the terms and conditions of this Agreement.

Please feel free to contact me if you have any questions at (415) 848-5852.

	
			
	Best,
	 
	 

	 
	 
	 

	/s/ Doug Merritt     
	 
	 

	Doug Merritt
	 
	 

	Chief Executive Officer and President
	 
	 

	Splunk Inc.
	 
	 

Enclosures:

•Employee Invention Assignment and Confidentiality Agreement 
•Code of Business Conduct and Ethics
•Insider Trading Policy
•Anticorruption Compliance Policy and Guidelines
•U.S. Export Controls Compliance Policy Statement
•Director and Officer Questionnaire

Acceptance and Agreement

I have read, understand, and agree to each of the terms and conditions set forth above.

I further acknowledge that no promises or commitments have been made to me except as specifically set forth herein.

	
			
	/s/ Susan St. Ledger                                                                   
	 
	March 7, 2016                                                                           

	Susan St. Ledger
	 
	Date

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