Document:

EX-10.1

 Exhibit 10.1 

DIRECTOR NOMINATION AGREEMENT 

THIS DIRECTOR NOMINATION AGREEMENT (this “Agreement”) is made and entered into as of October 23, 2020, by and among
Datto Holding Corp., a Delaware corporation (the “Company”), Vista Foundation Fund II, L.P., Vista Foundation Fund II-A, L.P., VFF II FAF, L.P., Vista Foundation Fund II Executive, L.P., Vista
Foundation Associates II, L.P., Merritt VI Aggregator, LLC (collectively referred to herein as the “Vista Funds”), VEP Group, LLC (“VEP Group” and, together with the Vista Funds and their Affiliates (as defined
herein), “Vista”) and each of the Persons listed on Schedule I hereto (collectively, the “McChord Stockholders”). This Agreement shall become effective (the “Effective Date”) upon the closing
of the Company’s initial public offering (the “IPO”) of shares of its common stock, par value $0.001 per share (the “Common Stock”). 

WHEREAS, as of the date hereof, the Vista Funds collectively own all of the outstanding equity interests of the Company (apart from interests
held by the McChord Stockholders and certain current and former directors, officers and employees of the Company) and whereas VEP Group is the indirect beneficial owner of the majority of such equity interests; 

WHEREAS, Vista is contemplating causing the Company to effect the IPO; 

WHEREAS, the McChord Stockholders currently have the authority to appoint one director of the Company and Vista currently has the authority to
appoint all remaining directors of the Company; 
 WHEREAS, in consideration of Vista agreeing to undertake the IPO, the Company has agreed
to permit Vista and the McChord Stockholders to designate persons for nomination for election to the board of directors of the Company (the “Board”) following the Effective Date on the terms and conditions set forth herein; 

NOW, THEREFORE, in consideration of the mutual covenants contained herein and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, each of the parties to this Agreement agrees as follows: 
 1. Board Nomination Rights.

 (a) From the Effective Date, VEP Group shall have the right, but not the obligation, to nominate to the Board a number of designees (such
persons, the “Vista Nominees”) equal to at least: (x) (i) 100% of the Total Number of Directors (as defined below), so long as Vista Beneficially Owns shares of Common Stock representing at least 40% of the Original Amount of VEP
Group, (ii) 40% of the Total Number of Directors, in the event that Vista Beneficially Owns shares of Common Stock representing at least 30% but less than 40% of the Original Amount of VEP Group, (iii) 30% of the Total Number of Directors, in the
event that Vista Beneficially Owns shares of Common Stock representing at least 20% but less than 30% of the Original Amount of VEP Group, (iv) 20% of the Total Number of Directors, in the event that Vista Beneficially Owns shares of Common Stock
representing at least 10% but less than 20% of the Original Amount of VEP Group and (v) 1 Director (as defined below), in the event that Vista Beneficially Owns shares 

 
of Common Stock representing at least 5% of the Original Amount of VEP Group, minus (y) the number of designees, if any, the McChord Stockholders are then entitled to nominate
pursuant to Section 1(b). For purposes of calculating the number of directors that VEP Group is entitled to designate pursuant to the immediately preceding sentence, any fractional amounts shall automatically be rounded up
to the nearest whole number (e.g., 11⁄4 Directors shall equate to 2 Directors) and any such calculations shall be made after taking into account any increase in the
Total Number of Directors. 
 (b) From the Effective Date, the McChord Stockholders shall have the right, but not the obligation, to nominate
to the Board one designee (the “McChord Nominee” and, together with the Vista Nominees, the “Nominees”), until such time as the McChord Stockholders cease to beneficially own at least 5% of the outstanding Common
Stock; provided, that any designee other than Austin McChord shall be subject to the prior written approval of VEP Group. 
 (c) In the event
that VEP Group has nominated less than the total number of designees, VEP Group shall be entitled to nominate pursuant to Section 1(a), Vista shall have the right, at any time, to nominate such additional designees to which
it is entitled, in which case, the Company and the Directors shall take all necessary corporation action, to the fullest extent permitted by applicable law (including with respect to fiduciary duties under Delaware law), to (x) enable VEP Group
to nominate and effect the election or appointment of such additional individuals, whether by increasing the size of the Board, or otherwise and (y) to designate such additional individuals nominated by VEP Group to fill such newly created
vacancies or to fill any other existing vacancies. 
 (d) In addition to the nomination rights set forth in
Section 1(a) above, from the Effective Date, for so long as Vista Beneficially Owns shares of Common Stock representing at least 5% of the Original Amount of VEP Group, VEP Group shall have the right, but not the
obligation, to designate a person (a “Non-Voting Observer”) to attend meetings of the Board (including any meetings of any committees thereof) in a
non-voting observer capacity. Any such Non-Voting Observer shall be permitted to attend all meetings of the Board. VEP Group shall have the right to remove and replace
its Non-Voting Observer at any time and from time to time. The Company shall furnish to any Non-Voting Observer (i) notices of Board meetings no later than, and
using the same form of communication as, notice of Board meetings are furnished to directors and (ii) copies of any materials prepared for meetings of the Board that are furnished to the directors no later than the time such materials are
furnished to the directors; provided that failure to deliver notice, or materials, to such Non-Voting Observer in connection with such Non-Voting Observer’s right
to attend and/or review materials with respect to, any meeting of the Board shall not, by itself, impair the validity of any action taken by such Board at such meeting. Such Non-Voting Observer shall be
required to execute or otherwise become subject to any codes of conduct or confidentiality agreements of the Company generally applicable to directors of the Company or as the Company reasonably requests. 

(e) The Company shall pay all reasonable out-of-pocket expenses
incurred by the Nominees and the Non-Voting Observer in connection with the performance of his or her duties as a director or a Non-Voting Observer and in connection
with his or her attendance at any meeting of the Board. 

  
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 (f) “Beneficially Own” shall mean that a specified person has or shares the
right, directly or indirectly, through any contract, arrangement, understanding, relationship or otherwise, to vote shares of capital stock of the Company. “Affiliate” of any person shall mean any other person controlled by,
controlling or under common control with such person; where “control” (including, with its correlative meanings, “controlling,” “controlled by” and “under common control with”)
means possession, directly or indirectly, of power to direct or cause the direction of management or policies (whether through ownership of securities, by contract or otherwise). 

(g) “Director” means any member of the Board. 

(h) “Original Amount of VEP Group” means the aggregate number of shares of Common Stock held, directly or indirectly, by VEP
Group on the date hereof, as such number may be adjusted from time to time for any reorganization, recapitalization, stock dividend, stock split, reverse stock split or other similar changes in the Company’s capitalization. 

(i) “Person” means any natural person, sole proprietorship, partnership, trust, unincorporated association, corporation,
limited liability company, entity or governmental entity. 
 (j) “Total Number of Directors” means the total number of
Directors comprising the Board. 
 (k) No reduction in the number of shares of Common Stock that Vista Beneficially Owns shall shorten the
term of any incumbent director who is serving as a Vista Nominee. At such time as the McChord Stockholders cease to beneficially own at least 5% of the Common Stock then outstanding, the McChord Nominee shall promptly furnish his or her resignation
to the Board, which the Board may accept or reject in its sole discretion. At the Effective Date, the Board shall be comprised of 9 members and the initial Vista Nominees shall be Marc Brown, Adrian Dillon, Maneet S. Saroya, John Stalder and Nadeem
Syed and the initial McChord Nominee shall be Austin McChord. 
 (l) In the event that any Nominee shall cease to serve for any reason, VEP
Group shall be entitled to designate such person’s successor in accordance with this Agreement (regardless of Vista’s beneficial ownership in the Company at the time of such vacancy) and the Board shall promptly fill the vacancy with such
successor nominee; it being understood that any such designee shall serve the remainder of the term of the director whom such designee replaces. 

(m) If a Vista Nominee or McChord Nominee is not appointed or elected to the Board because of such person’s death, disability,
disqualification, withdrawal as a nominee or for other reason is unavailable or unable to serve on the Board, VEP Group or the McChord Stockholders, as applicable, shall be entitled to designate promptly another nominee and the director position for
which the original Nominee was nominated shall not be filled pending such designation. 

  
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 (n) So long as VEP Group has the right to nominate Nominees under
Section 1(a) or any such Nominee is serving on the Board, the Company shall use its reasonable best efforts to maintain in effect at all times directors and officers indemnity insurance coverage reasonably satisfactory to
Vista, and the Company’s Amended and Restated Certificate of Incorporation and Amended and Restated Bylaws (each as may be further amended, supplemented or waived in accordance with its terms) shall at all times provide for indemnification,
exculpation and advancement of expenses to the fullest extent permitted under applicable law. 
 (o) If the size of the Board is expanded,
VEP Group shall be entitled to nominate a number of Nominees to fill the newly created vacancies such that the total number of Nominees serving on the Board following such expansion will be equal to that number of Nominees that VEP Group would be
entitled to nominate in accordance with Section 1(a) if such expansion occurred immediately prior to any meeting of the stockholders of the Company called with respect to the election of members of the Board, and the Board
shall appoint such Nominees to the Board. 
 (p) At such time as the Company ceases to be a “controlled company” and is required by
applicable law or the New York Stock Exchange (the “Exchange”) listing standards to have a majority of the Board comprised of “independent directors” (subject in each case to any applicable
phase-in periods), Vista’s Nominees shall include a number of persons that qualify as “independent directors” under applicable law and the Exchange listing standards such that, together with any
other “independent directors” then serving on the Board that are not Nominees, the Board is comprised of a majority of “independent directors.” 

(q) At any time that VEP Group or the McChord Stockholders shall have any nomination rights under Section 1, the
Company shall not take any action, including making or recommending any amendment to the Certificate of Incorporation or the Company’s bylaws that could reasonably be expected to adversely affect VEP Group’s or the McChord
Stockholders’ rights, respectively, under this Agreement, in each case without the prior written consent of VEP Group or the McChord Stockholders, respectively. 

2. Company Obligations. The Company agrees to use its reasonable best efforts to ensure that prior to the date that Vista and its
Affiliates cease to Beneficially Own shares of Common Stock representing at least 5% of the total voting power of the then outstanding Common Stock, (i) each Nominee is included in the Board’s slate of nominees to the stockholders (the
“Board’s Slate”) for each election of directors; and (ii) each Nominee is included in the proxy statement prepared by management of the Company in connection with soliciting proxies for every meeting of the stockholders of
the Company called with respect to the election of members of the Board (each, a “Director Election Proxy Statement”), and at every adjournment or postponement thereof, and on every action or approval by written consent of the
stockholders of the Company or the Board with respect to the election of members of the Board. VEP Group will promptly provide reporting to the Company after Vista ceases to Beneficially Own shares of Common Stock representing at least 5% of the
total voting power of the then outstanding Common Stock, such that Company is informed of when this obligation terminates. The calculation of the number of Nominees that VEP Group and the McChord Stockholders are entitled to nominate to the
Board’s Slate for any election of directors shall be based on the percentage of the total voting power of the then outstanding Common Stock then Beneficially Owned by Vista (“Vista Voting Control”) or the McChord Stockholders,
as applicable, immediately prior to the mailing to shareholders of the Director Election Proxy Statement relating to such election (or, if earlier, the filing of the definitive Director Election Proxy Statement with the U.S. Securities and Exchange
Commission). Unless 

  
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VEP Group notifies the Company otherwise prior to the mailing to shareholders of the Director Election Proxy Statement relating to an election of directors, the Nominees for such election shall
be presumed to be the same Nominees currently serving on the Board, and no further action shall be required of VEP Group for the Board to include such Nominees on the Board’s Slate; provided, that, in the event VEP Group is no longer entitled
to nominate the full number of Nominees then serving on the Board, VEP Group shall provide advance written notice to the Company, of which currently servicing Nominee(s) shall be excluded from the Board Slate, and of any other changes to the list of
Nominees. If VEP Group fails to provide such notice prior to the mailing to shareholders of the Director Election Proxy Statement relating to such election (or, if earlier, the filing of the definitive Director Election Proxy Statement with the U.S.
Securities and Exchange Commission), a majority of the independent directors then serving on the Board shall determine which of the Nominees of VEP Group then serving on the Board will be included in the Board’s Slate. Furthermore, the Company
agrees for so long as the Company qualifies as a “controlled company” under the rules of the Exchange the Company will elect to be a “controlled company” for purposes of the Exchange and will disclose in its annual meeting proxy
statement that it is a “controlled company” and the basis for that determination. The Company and Vista acknowledge and agree that, as of the Effective Date, the Company is a “controlled company.” 

3. Committees. From and after the Effective Date hereof until such time as Vista and its Affiliates cease to Beneficially Own shares of
Common Stock representing at least 5% of the total voting power of the then outstanding Common Stock, Vista shall have the right to designate a number of members of each committee of the Board equal to the nearest whole number greater than the
product obtained by multiplying (a) the percentage of the total voting power of the then outstanding Common Stock then Beneficially Owned by Vista and (b) the number of positions, including any vacancies, on the applicable committee,
provided that any such designee shall be a director and shall be eligible to serve on the applicable committee under applicable law or listing standards of the Exchange, including any applicable independence requirements (subject in each case to any
applicable exceptions, including those for newly public companies and for “controlled companies,” and any applicable phase-in periods). Any additional members shall be determined by the Board.
Nominees designated to serve on a Board committee shall have the right to remain on such committee until the next election of directors, regardless of the level of Vista Voting Control following such designation. Unless VEP Group notifies the
Company otherwise prior to the time the Board takes action to change the composition of a Board committee, and to the extent Vista has the requisite Vista Voting Control for VEP Group to nominate a Board committee member at the time the Board takes
action to change the composition of any such Board committee, any Nominee currently designated by VEP Group to serve on a committee shall be presumed to be re-designated for such committee. 

4. Amendment and Waiver. Any provision of this Agreement may be amended or waived if, but only if, such amendment or waiver is in
writing and is signed, in the case of an amendment, by the Company, Vista and the McChord stockholders, or in the case of a waiver, by the party against whom the waiver is to be effective; provided that the consent of the McChord Stockholders shall
not be required for an amendment or waiver at any time after the McChord Stockholders cease to beneficially own at least 5% of the Company’s outstanding common stock. No failure or delay by any party in exercising any right, power or privilege
hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further 

  
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exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein provided shall be cumulative and not exclusive of any rights or remedies provided by law.
Neither VEP Group nor the McChord Stockholders shall be obligated to nominate all (or any) of the Nominees each is entitled to nominate pursuant to this Agreement for any election of directors but the failure to do so shall not constitute a waiver
of such party’s rights hereunder with respect to future elections; provided, however, that in the event VEP Group or the McChord Stockholders fail to nominate all (or any) of the Nominees such parties are entitled to nominate
pursuant to this Agreement prior to the mailing to shareholders of the Director Election Proxy Statement relating to such election (or, if earlier, the filing of the definitive Director Election Proxy Statement with the U.S. Securities and Exchange
Commission), the Compensation and Nominating Committee of the Board shall be entitled to nominate individuals in lieu of such Nominees for inclusion in the Board’s Slate and the applicable Director Election Proxy Statement with respect to the
election for which such failure occurred and VEP Group or the McChord Stockholders, as applicable, shall be deemed to have waived such parties’ rights hereunder with respect to such election. The rights and remedies herein provided shall be
cumulative and not exclusive of any rights or remedies provided by law. 
 5. Benefit of Parties. This Agreement shall be binding upon
and shall inure to the benefit of the parties hereto and their respective permitted successors and assigns. Notwithstanding the foregoing, neither the Company nor the McChord Stockholders may assign any of their rights or obligations hereunder
without the prior written consent of Vista. Except as otherwise expressly provided in Section 6, nothing herein contained shall confer or is intended to confer on any third party or entity that is not a party to this
Agreement any rights under this Agreement. 
 6. Assignment. Upon written notice to the Company, VEP Group may assign to any of the
Vista Funds or any Affiliate of VEP Group (other than a portfolio company) all of its rights hereunder and, following such assignment, such assignee shall be deemed to be “VEP Group” for all purposes hereunder. 

7. Indemnification. 
 (a)
The Company shall defend, indemnify and hold harmless Vista and the McChord Stockholders, their respective Affiliates, partners, employees, agents, directors, managers, officers and controlling Persons (collectively, the “Indemnified
Parties”) from and against any and all actions, causes of action, suits, claims, liabilities, losses, damages, costs, expenses, or obligations of any kind or nature (whether accrued or fixed, absolute or contingent) in connection therewith
(including reasonable attorneys’ fees and expenses) incurred by the Indemnified Parties before or after the date of this Agreement (each, an “Action”) arising directly or indirectly out of, or in any way relating to, (i) any
Vista Entity’s, McChord Stockholders’ or their respective Affiliates’ Beneficial Ownership of Common Stock or other equity securities of the Company or control or ability to influence the Company or any of its subsidiaries (other than
any such Actions (x) to the extent such Actions arise out of any breach of this Agreement by an Indemnified Party or its Affiliates or the breach of any fiduciary or other duty or obligation of such Indemnified Party to its direct or indirect
equity holders, creditors or Affiliates or (y) to the extent such Actions are directly caused by such Person’s willful misconduct), (ii) the business, operations, properties, assets or other rights or liabilities of the Company or any of
its subsidiaries or (iii) any services 

  
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provided prior, on or after the date of this Agreement by any Vista Entity, McChord Stockholder or their respective Affiliates to the Company or any of its subsidiaries. The Company shall defend
at its own cost and expense in respect of any Action which may be brought against the Company and/or its Affiliates and the Indemnified Parties. The Company shall defend at its own cost and expense any and all Actions which may be brought in which
the Indemnified Parties may be impleaded with others upon any Action by the Indemnified Parties, except that if such damage shall be proven to be the direct result of gross negligence, bad faith or willful misconduct by any of the Indemnified
Parties, then such Indemnified Party shall reimburse the Company for the costs of defense and other costs incurred by the Company in proportion to such Indemnified Party’s culpability as proven. In the event of the assertion against any
Indemnified Party of any Action or the commencement of any Action, the Company shall be entitled to participate in such Action and in the investigation of such Action and, after written notice from the Company to such Indemnified Party, to assume
the investigation or defense of such Action with counsel of the Company’s choice at the Company’s expense; provided, however, that such counsel shall be reasonably satisfactory to the Indemnified Party. Notwithstanding anything to the
contrary contained herein, the Company may retain one firm of counsel to represent all Indemnified Parties in such Action; provided, however, that the Indemnified Party shall have the right to employ a single firm of separate counsel (and any
necessary local counsel) and to participate in the defense or investigation of such Action and the Company shall bear the expense of such separate counsel (and local counsel, if applicable), if (x) in the opinion of counsel to the Indemnified
Party use of counsel of the Company’s choice could reasonably be expected to give rise to a conflict of interest, (y) the Company shall not have employed counsel satisfactory to the Indemnified Party to represent the Indemnified Party
within a reasonable time after notice of the assertion of any such Action or (z) the Company shall authorize the Indemnified Party to employ separate counsel at the Company’s expense. The Company further agrees that with respect to any
Indemnified Party who is employed, retained or otherwise associated with, or appointed or nominated by, Vista, the McChord Stockholders or any of their respective Affiliates and who acts or serves as a director, officer, manager, fiduciary,
employee, consultant, advisor or agent of, for or to the Company or any of its subsidiaries, that the Company or such subsidiaries, as applicable, shall be primarily liable for all indemnification, reimbursements, advancements or similar payments
(the “Indemnity Obligations”) afforded to such Indemnified Party acting in such capacity or capacities on behalf or at the request of the Company, whether the Indemnity Obligations are created by law, organizational or constituent
documents, contract (including this Agreement) or otherwise. The Company hereby agrees that in no event shall the Company or any of its subsidiaries have any right or claim against any Vista Entity or McChord Stockholder for contribution or have
rights of subrogation against any Vista Entity or McChord Stockholder through an Indemnified Party for any payment made by the Company or any of its subsidiaries with respect to any Indemnity Obligation. In addition, the Company hereby agrees that
in the event that any Vista Entity or McChord Stockholder pay or advance an Indemnified Party any expenses with respect to an Indemnity Obligation, the Company will, or will cause its subsidiaries to, as applicable, promptly reimburse any such Vista
Entity or McChord Stockholder, respectively, for such payment or advance upon request; subject to the receipt by the Company of a written undertaking executed by the Indemnified Party and the Vista Entity or McChord Stockholder, as applicable, that
makes such payment or advance to repay any such amounts if it shall ultimately be determined by a court of competent jurisdiction that such Indemnified Party was not entitled to be indemnified by the Company. The foregoing right to indemnity shall
be in addition to any rights that any Indemnified Party may have at common law 

  
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or otherwise and shall remain in full force and effect following the completion or any termination of the engagement. If for any reason the foregoing indemnification is unavailable to any
Indemnified Party or insufficient to hold it harmless as and to the extent contemplated by this Section 7, then the Company shall contribute to the amount paid or payable by the Indemnified Party as a result of such Action in such proportion as
is appropriate to reflect the relative benefits received by the Company, on the one hand, and the Indemnified Party, as the case may be, on the other hand, as well as any other relevant equitable considerations. 

(b) The Company hereby acknowledges that the certain of the Indemnified Parties have certain rights to indemnification, advancement of expenses
and/or insurance provided by investment funds managed by Vista and certain of its Affiliates (collectively, the “Fund Indemnitors”). The Company hereby agrees with respect to any indemnification, hold harmless obligation, expense
advancement or reimbursement provision or any other similar obligation whether pursuant to or with respect to this Agreement, the organizational documents of the Company or any of its subsidiaries or any other agreement, as applicable, (i) that
the Company and its subsidiaries are the indemnitor of first resort (i.e., their obligations to the Indemnified Parties are primary and any obligation of the Fund Indemnitors to advance expenses or to provide indemnification for claims, expenses or
obligations arising out of the same or similar facts and circumstances suffered by any Indemnified Party are secondary), (ii) that the Company shall be required to advance the full amount of expenses incurred by any Indemnified Party and shall be
liable for the full amount of all expenses, liabilities, obligations, judgments, penalties, fines, and amounts paid in settlement to the extent legally permitted and as required by the terms of this Agreement, the organizational documents of the
Company or any of its subsidiaries or any other agreement, as applicable, without regard to any rights any Indemnified Party may have against the Fund Indemnitors, and (iii) that the Company, on behalf of itself and each of its subsidiaries,
irrevocably waives, relinquishes and releases the Fund Indemnitors from any and all Actions against the Fund Indemnitors for contribution, subrogation or any other recovery of any kind in respect thereof. The Company further agrees that no
advancement or payment by the Fund Indemnitors on behalf of any Indemnified Party with respect to any Action for which any Indemnified Party has sought indemnification from the Company shall affect the foregoing and the Fund Indemnitors shall have a
right of contribution and/or be subrogated to the extent of such advancement or payment to all of the rights of recovery of any Indemnified Party against the Company. The Company agrees that the Fund Indemnitors are express third-party beneficiaries
of the terms of this Section 7(b). 
 8. Headings. Headings are for ease of reference only and shall not form a part of this
Agreement. 
 9. Governing Law. This Agreement shall be construed in accordance with and governed by the law of the State of Delaware
without giving effect to the principles of conflicts of laws thereof. 
 10. Jurisdiction. Any suit, action or proceeding seeking to
enforce any provision of, or based on any matter arising out of or in connection with, this Agreement may be brought against any of the parties in any federal court located in the State of Delaware or any Delaware state court, and each of the
parties hereby consents to the exclusive jurisdiction of such court (and of the 

  
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appropriate appellate courts) in any such suit, action or proceeding and waives any objection to venue laid therein. Process in any such suit, action or proceeding may be served on any party
anywhere in the world, whether within or without the jurisdiction of any such court. Without limiting the foregoing, each of the parties agrees that service of process upon such party at the address referred to in
Section 17, together with written notice of such service to such party, shall be deemed effective service of process upon such party. 

11. WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL
PROCEEDING ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT. 
 12. Entire Agreement. This Agreement constitutes the entire
agreement among the parties with respect to the subject matter hereof and supersedes all prior agreements, understandings and negotiations, both written and oral among the parties with respect to the subject matter hereof. 

13. Counterparts; Effectiveness. This Agreement may be signed in any number of counterparts, each of which shall be deemed an original.
This Agreement shall become effective when each party shall have received a counterpart hereof signed by each of the other parties. An executed copy or counterpart hereof delivered by facsimile shall be deemed an original instrument. 

14. Severability. If any provision of this Agreement or the application thereof to any person or circumstance shall be invalid or
unenforceable to any extent, the remainder of this Agreement and the application of such provisions to other persons or circumstances shall not be affected thereby and shall be enforced to the greatest extent permitted by law. 

15. Further Assurances. Each of the parties hereto shall execute and deliver such further instruments and do such further acts and
things as may be required to carry out the intent and purpose of this Agreement. 
 16. Specific Performance. Each of the parties
hereto agree that irreparable damage would occur if any provision of this Agreement were not performed in accordance with the terms hereof and that the parties shall be entitled to an injunction or injunctions to prevent breaches of this Agreement
or to enforce specifically the performance of the terms and provisions hereof in any federal or state court located in the State of Delaware, in addition to any other remedy to which they are entitled at law or in equity. 

  
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 17. Notices. All notices, requests and other communications to any party or to the
Company shall be in writing (including telecopy or similar writing) and shall be given, 
 If to the Company: 

Datto Holding Corp. 
 101 Merritt
7 
 Norwalk, CT 06851 

Attention: General Counsel 
 If
to any member of Vista or any Vista Nominee: 
 c/o Vista Equity Partners 

4 Embarcadero Center 
 20th Floor

 San Francisco, California 94111 

Attention: David Breach 

Christina Lema 
 Facsimile: (415)
765-6666 
 With a copy to (which shall not constitute notice): 

Kirkland & Ellis LLP 

300 N. LaSalle 
 Chicago, IL 60654

 Attention: Robert M. Hayward, P.C. 

Robert E. Goedert, P.C. 

Facsimile: (312) 862-2200 

If to any McChord Stockholder or to the McChord Nominee: 

The address set forth on Schedule I hereto. 
 or
to such other address or telecopier number as such party or the Company may hereafter specify for the purpose by notice to the other parties and the Company. Each such notice, request or other communication shall be effective when delivered at the
address specified in this Section 17 during regular business hours. 
 18. Enforcement. Each of the parties
hereto covenant and agree that the disinterested members of the Board have the right to enforce, waive or take any other action with respect to this Agreement on behalf of the Company. 

*    *    *    *    * 

  
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 IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the date first above
written. 
  

			
	DATTO HOLDING CORP.
		
	By:	 	 /s/ Tim Weller

	Name:	 	Tim Weller
	Title:	 	Chief Executive Officer
	
	VISTA FOUNDATION FUND II, L.P.
		
	By:	 	Vista Foundation Fund II GP, LLC
	Its:	 	General Partner
		
	By:	 	VEP Group, LLC
	Its:	 	Senior Managing Member
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Managing Member
	
	VISTA FOUNDATION FUND II-A, L.P.
		
	By:	 	VFF II GP (Cayman), L.P.
	Its:	 	General Partner
		
	By:	 	VFF II GP (Cayman), Ltd.
	Its:	 	General Partner
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Sole director and member

 [Signature Page - Director Nomination Agreement] 

 
			
	VFF II FAF, L.P.
		
	By:	 	Vista Foundation Fund II GP, LLC
	Its:	 	General Partner
		
	By:	 	VEP Group, LLC
	Its:	 	Senior Managing Member
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Managing Member
	
	VISTA FOUNDATION FUND II EXECUTIVE, L.P.
		
	By:	 	Vista Foundation Fund II GP, LLC
	Its:	 	General Partner
		
	By:	 	VEP Group, LLC
	Its:	 	Senior Managing Member
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Managing Member
	
	VISTA FOUNDATION ASSOCIATES II, L.P.
		
	By:	 	VEP Group, LLC
	Its:	 	Senior Managing Member
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Managing Member

 [Signature Page - Director Nomination Agreement] 

 
			
	MERRITT VI AGGREGATOR, LLC
		
	By:	 	Vista Equity Partners Funds VI, L.P.
	Its:	 	Managing Member
		
	By:	 	Vista Equity Partners Funds VI GP, L.P.
	Its:	 	General Partner
		
	By:	 	VEPF VIGP, Ltd.
	Its:	 	General Partner
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Sole director and member
	
	VEP GROUP, LLC
		
	By:	 	 /s/ Robert F. Smith

	Name:	 	Robert F. Smith
	Title:	 	Managing Member

 [Signature Page - Director Nomination Agreement] 

 
			
	McChord Stockholders:
		
	By:	 	 /s/ Austin McChord

	Name: Austin McChord
	
	 AUSTIN MCCHORD NON-EXEMPT

IRREVOCABLE FAMILY TRUST

		
	By:	 	 /s/ Virginia Hurst

	Name: Virginia Hurst, on behalf of J.P. Morgan Trust Company of Delaware
	Its: Trustee, Vice President
	
	 AUSTIN MCCHORD GST-EXEMPT

IRREVOCABLE FAMILY TRUST

		
	By:	 	 /s/ Virginia Hurst

	Name: Virginia Hurst, on behalf of J.P. Morgan Trust Company of Delaware
	Its: Trustee, Vice President
	
	Notice Address of McChord Stockholders:

 [Signature Page - Director Nomination Agreement] 

 Schedule I 

McChord Stockholders 
 Austin McChord 

Austin McChord Non-Exempt Irrevocable Family Trust 

Austin McChord GST-Exempt Irrevocable Family TrustDocument

FOURTH AMENDMENT TO 
SECOND AMENDED AND RESTATED CREDIT AGREEMENT

    THIS FOURTH AMENDMENT TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT (this “Agreement”) is made as of the 14th day of October, 2020, by and among LYDALL, INC., a Delaware corporation (“Borrower”), LYDALL THERMAL/ACOUSTICAL, INC., a Delaware corporation (“Lydall Thermal”), LYDALL PERFORMANCE MATERIALS, INC., a Connecticut corporation (“Lydall Performance”), LYDALL INTERNATIONAL, INC., a Delaware corporation (“Lydall International”), SOUTHERN FELT COMPANY, INC., a South Carolina corporation (“Southern Felt”), LYDALL NORTH AMERICA, LLC, a Connecticut limited liability company (“Lydall North America”), LYDALL PERFORMANCE MATERIALS (US), INC., a Delaware corporation (“Lydall Performance (US)”), LYDALL SEALING SOLUTIONS, INC., a Delaware corporation (“Lydall Sealing”), and SUSQUEHANNA CAPITAL ACQUISITION CO., a Delaware corporation (“Susquehanna Capital” and each of Lydall Thermal, Lydall Performance, Lydall International, Southern Felt, Lydall North America, Lydall Performance (US), and Lydall Sealing, is sometimes individually referred to herein as a “Guarantor”, and all such entities are herein collectively referred to as, the “Guarantors”) and Bank of America, N.A., a national banking association (“Bank of America”), as Swingline Lender and L/C Issuer, and on behalf of itself and as administrative agent (in such capacity, the “Agent”), for the ratable benefit of itself and the other lenders that are a party to the Credit Agreement (defined below) (collectively with Bank of America, the “Lenders”).  Capitalized terms used herein but not defined shall have the meaning given to such terms in the Credit Agreement.

RECITALS

    WHEREAS, Borrower, Guarantors, Agent and Lenders are parties to that certain Second Amended and Restated Credit Agreement dated as of August 31, 2018, as amended by that certain First Amendment to Second Amended and Restated Credit Agreement dated as of December 6, 2019, as further amended by that certain Second Amendment to Second Amended and Restated Credit Agreement dated as of February 14, 2020, as further amended by that certain Third Amendment to Second Amended and Restated Credit Agreement dated as of May 11, 2020 (as amended and in effect from time to time, the “Credit Agreement”).  

    WHEREAS, the parties hereto desire to amend the Credit Agreement pursuant to terms herein to, among other things, reflect certain capital transactions of the Borrower and its Subsidiaries. 

AGREEMENT

    NOW, THEREFORE, in consideration of the mutual promises and covenants contained herein, the parties hereto agree as follows:

1.    Amendments to Credit Agreement.  

    (a)    The following definitions from Section 1.01 of the Credit Agreement are hereby amended and restated as follows:  
    
    

    “Consolidated EBITDA” means, for any period, the sum (in each case, without duplication) of the following determined on a Consolidated basis for the Borrower and its Subsidiaries in accordance with GAAP, (a) Consolidated Net Income for the most recently completed Measurement Period plus (b) the following to the extent deducted in calculating such Consolidated Net Income:  (i) Consolidated Interest Charges, (ii) the provision for federal, state, local and foreign income taxes payable, (iii) depreciation and amortization expense, (iv) costs and expenses incurred in connection with the Closing Date Acquisition and other Permitted Acquisitions, evidenced by supporting documentation acceptable to the Administrative Agent; (v) fees and expenses payable by Borrower in connection with this Agreement and the other Loan Documents; (vi) non-cash stock compensation expenses, (vii) increases to costs of goods sold because of the one-time write-up of inventory in connection with the Closing Date Acquisition, not to exceed $5,000,000 in the aggregate; (viii) increases to costs of goods sold because of the one-time write-up of inventory in connection with any Permitted Acquisition other than the Closing Date Acquisition, (ix) one-time, non-cash charges and losses resulting from the Expected Plan Termination, not to exceed $30,000,000 in the aggregate, (x) one-time, non-cash charges and losses resulting from any future employee benefit plan termination acquired by Lydall as part of the acquisition of the business known as Interface Performance Materials, not to exceed $15,000,000 in the aggregate; (xi) other non-cash charges and losses but excluding any such non-cash charges or losses to the extent (A) there were cash charges with respect to such charges and losses in past accounting periods or (B) there is a reasonable expectation that there will be cash charges with respect to such charges and losses in future accounting periods; (xii) costs and expenses incurred in connection with Permitted Transfers, evidenced by supporting documentation acceptable to the Administrative Agent; (xiii) so long as such costs are incurred before May 1, 2020, actual severance costs incurred due to reduction-in-force and other restructuring initiatives, not to exceed an aggregate amount of $2,000,000; (xiv) so long as such costs are incurred before May 1, 2020, one-time cash compensation and related recruiting expenses associated with the transition of the Company’s President and Chief Executive Officer, not to exceed $2,500,000; (xv) non-cash impairment charges; (xvi) one-time costs to close or sell the Performance Materials facility in Altenkirchen, Germany, not to exceed $13,500,000 in the aggregate, so long as such costs are incurred on or before March 31, 2021; (xvii) so long as such costs are incurred on or before September 30, 2020, one-time costs to close the Performance Materials facility in the Netherlands, not to exceed $2,400,000; (xviii) so long as such costs are incurred on or before September 30, 2020, non-cash expenses to close the Carded Line product in the Green Island, New York facility, not to exceed $5,500,000; and (xix) so long as such costs are incurred on or before December 31, 2020, one-time costs for consulting fees related to the automotive business, not to exceed $2,000,000; provided, that, for any twelve (12) month period, the aggregate amount of the adjustments to Consolidated EBITDA made pursuant to clauses (iv), (v), (viii), (xi) and (xii) above, plus the aggregate amount of Synergies and Cost Savings for such period, shall not exceed ten percent (10%) of Consolidated EBITDA for such period; less (c) to the extent reflected as a gain or otherwise included in the calculation of Consolidated Net Income for such period (i) non-cash gains (excluding any such non-cash gains to the extent (A) there were cash gains with respect to such gains in past accounting periods or (B) there is a reasonable expectation that there will be cash gains with respect to such gains in future accounting periods).
    2

“LIBOR Successor Rate Conforming Changes” means, with respect to any proposed LIBOR Successor Rate, any conforming changes to the definition of Base Rate, Interest Period, timing and frequency of determining rates and making payments of interest and other technical, administrative or operational matters (including, for the avoidance of doubt, the definition of Business Day, timing of borrowing requests or prepayment, conversion or continuation notices and length of lookback periods) as may be appropriate, in the discretion of the Administrative Agent, to reflect the adoption and implementation of such LIBOR Successor Rate and to permit the administration thereof by the Administrative Agent in a manner substantially consistent with market practice (or, if the Administrative Agent determines that adoption of any portion of such market practice is not administratively feasible or that no market practice for the administration of such LIBOR Successor Rate exists, in such other manner of administration as the Administrative Agent determines is reasonably necessary in connection with the administration of this Agreement and any other Loan Document).
“Relevant Governmental Body” means the Federal Reserve Board and/or the Federal Reserve Bank of New York, or a committee officially endorsed or convened by the Federal Reserve Board and/or the Federal Reserve Bank of New York. 
“SOFR” with respect to any Business Day means the secured overnight financing rate published for such day by the Federal Reserve Bank of New York, as the administrator of the benchmark (or a successor administrator) on the Federal Reserve Bank of New York’s website (or any successor source) at approximately 8:00 a.m. (New York City time) on the immediately succeeding Business Day and, in each case, that has been selected or recommended by the Relevant Governmental Body. 

(b) The following definitions are hereby deleted from Section 1.01:

“SOFR-Based Rate” means SOFR or Term SOFR.
(c)    The following definitions are hereby added to Section 1.01, in their appropriate alphabetical order: 

“ISDA Definitions” means the 2006 ISDA Definitions published by the International Swaps and Derivatives Association, Inc. or any successor thereto, as amended or supplemented from time to time, or any successor definitional booklet for interest rate derivatives published from time to time by the International Swaps and Derivatives Association, Inc. or such successor thereto. 
“LIBOR Replacement Date” has the meaning specified in Section 3.03(c). 
“LIBOR Successor Rate” has the meaning specified in Section 3.03(c).
    3

“Pre-Adjustment Successor Rate” has the meaning specified in Section 3.03(c).
“Related Adjustment” means, in determining any LIBOR Successor Rate, the first relevant available alternative set forth in the order below that can be determined by the Administrative Agent applicable to such LIBOR Successor Rate: 

a.the spread adjustment, or method for calculating or determining such spread adjustment, that has been selected or recommended by the Relevant Governmental Body for the relevant Pre-Adjustment Successor Rate (taking into account the interest period, interest payment date or payment period for interest calculated and/or tenor thereto) and which adjustment or method (x) is published on an information service as selected by the Administrative Agent from time to time in its reasonable discretion or (y) solely with respect to Term SOFR, if not currently published, which was previously so recommended for Term SOFR and published on an information service acceptable to the Administrative Agent; or 
b.the spread adjustment that would apply (or has previously been applied) to the fallback rate for a derivative transaction referencing the ISDA Definitions (taking into account the interest period, interest payment date or payment period for interest calculated and/or tenor thereto).
(d)    Section 3.03(c) is hereby amended and restated in its entirety as follows:

“(c)  Notwithstanding anything to the contrary in this Agreement or any other Loan Documents, if the Administrative Agent determines (which determination shall be conclusive absent manifest error), or the Borrower or Required Lenders notify the Administrative Agent (with, in the case of the Required Lenders, a copy to the Borrower) that the Borrower or Required Lenders (as applicable) have determined, that:
i.adequate and reasonable means do not exist for ascertaining LIBOR for any Interest Period hereunder or any other tenors of LIBOR, including, without limitation, because the LIBOR Screen Rate is not available or published on a current basis and such circumstances are unlikely to be temporary; or 
i.the administrator of the LIBOR Screen Rate or a Governmental Authority having jurisdiction over the Administrative Agent or such administrator has made a public statement identifying a specific date after which LIBOR or the LIBOR Screen Rate shall no longer be made available, or used for determining the interest rate of loans, provided that, at the time of such statement, there is no successor administrator that is satisfactory to the Administrative Agent, that will continue to provide LIBOR after such specific date (such specific date, the “Scheduled Unavailability Date”); or
ii.the administrator of the LIBOR Screen Rate or a Governmental Authority having jurisdiction over such administrator has made a public statement announcing that all Interest Periods and other tenors of LIBOR are no longer representative; or
iii.syndicated loans currently being executed, or that include language similar to that contained in this Section 3.03, are being executed or amended (as applicable) to incorporate or adopt a new benchmark interest rate to replace LIBOR;
    4

then, in the case of clauses (i)-(iii) above, on a date and time determined by the Administrative Agent (any such date, the “LIBOR Replacement Date”), which date shall be at the end of an Interest Period or on the relevant interest payment date, as applicable, for interest calculated and shall occur reasonably promptly upon the occurrence of any of the events or circumstances under clauses (i), (ii) or (iii) above and, solely with respect to clause (ii) above, no later than the Scheduled Unavailability Date, LIBOR will be replaced hereunder and under any Loan Document with, subject to the proviso below, the first available alternative set forth in the order below for any payment period for interest calculated that can be determined by the Administrative Agent, in each case, without any amendment to, or further action or consent of any other party to, this Agreement or any other Loan Document (the “LIBOR Successor Rate”; and any such rate before giving effect to the Related Adjustment, the “Pre-Adjustment Successor Rate”):
(x)    Term SOFR plus the Related Adjustment; and
(y)     SOFR plus the Related Adjustment; 
and in the case of clause (iv) above, the Borrower and Administrative Agent may amend this Agreement solely for the purpose of replacing LIBOR under this Agreement and under any other Loan Document in accordance with the definition of “LIBOR Successor Rate” and such amendment will become effective at 5:00 p.m., on the fifth Business Day  after the Administrative Agent shall have notified all Lenders and the Borrower of the occurrence of the circumstances described in clause (iv) above unless, prior to such time, Lenders comprising the Required Lenders have delivered to the Administrative Agent written notice that such Required Lenders object to the implementation of a LIBOR Successor Rate pursuant to such clause;
provided that, if the Administrative Agent determines that Term SOFR has become available, is administratively feasible for the Administrative Agent and would have been identified as the Pre-Adjustment Successor Rate in accordance with the foregoing if it had been so available at the time that the LIBOR Successor Rate then in effect was so identified, and the Administrative Agent notifies the Borrower and each Lender of such availability, then from and after the beginning of the Interest Period, relevant interest payment date or payment period for interest calculated, in each case, commencing no less than thirty (30) days after the date of such notice, the Pre-Adjustment Successor Rate shall be Term SOFR and the LIBOR Successor Rate shall be Term SOFR plus the relevant Related Adjustment. 
 
The Administrative Agent will promptly (in one or more notices) notify the Borrower and each Lender of (x) any occurrence of any of the events, periods or circumstances under clauses (i) through (iii) above, (y) a LIBOR Replacement Date and (z) the LIBOR Successor Rate.
    Any LIBOR Successor Rate shall be applied in a manner consistent with market practice; provided that to the extent such market practice is not administratively feasible for the Administrative Agent, such LIBOR Successor Rate shall be applied in a manner as otherwise reasonably determined by the Administrative Agent.

    Notwithstanding anything else herein, if at any time any LIBOR Successor Rate as so determined would otherwise be less than one percent (1%), the LIBOR Successor Rate will be deemed to be one percent (1%) for the purposes of this Agreement and the other Loan Documents.
    5

    In connection with the implementation of a LIBOR Successor Rate, the Administrative Agent will have the right to make LIBOR Successor Rate Conforming Changes from time to time and, notwithstanding anything to the contrary herein or in any other Loan Document, any amendments implementing such LIBOR Successor Rate Conforming Changes will become effective without any further action or consent of any other party to this Agreement; provided that, with respect to any such amendment effected, the Administrative Agent shall post each such amendment implementing such LIBOR Successor Rate Conforming Changes to the Borrower and the Lenders reasonably promptly after such amendment becomes effective.

If the events or circumstances of the type described in 3.03(c)(i)-(iii) have occurred with respect to the LIBOR Successor Rate then in effect, then the successor rate thereto shall be determined in accordance with the definition of “LIBOR Successor Rate.””

(e)    A new Section 3.03(d) is hereby added as follows:

“(d)    Notwithstanding anything to the contrary herein, (i) after any such determination by the Administrative Agent or receipt by the Administrative Agent of any such notice described under Section 3.03(c)(i)-(iii), as applicable, if the Administrative Agent determines that none of the LIBOR Successor Rates is available on or prior to the LIBOR Replacement Date, (ii) if the events or circumstances described in Section 3.03(c)(iv) have occurred but none of the LIBOR Successor Rates is available, or (iii) if the events or circumstances of the type described in Section 3.03(c)(i)-(iii) have occurred with respect to the LIBOR Successor Rate then in effect and the Administrative Agent determines that none of the LIBOR Successor Rates is available, then in each case, the Administrative Agent and the Borrower may amend this Agreement solely for the purpose of replacing LIBOR or any then current LIBOR Successor Rate in accordance with this Section 3.03 at the end of any Interest Period, relevant interest payment date or payment period for interest calculated, as applicable, with another alternate benchmark rate giving due consideration to any evolving or then existing convention for similar U.S. dollar denominated syndicated credit facilities for such alternative benchmarks and, in each case, including any Related Adjustments and any other mathematical or other adjustments to such benchmark giving due consideration to any evolving or then existing convention for similar U.S. dollar denominated syndicated credit facilities for such benchmarks, which adjustment or method for calculating such adjustment shall be published on an information service as selected by the Administrative Agent from time to time in its reasonable discretion and may be periodically updated. For the avoidance of doubt, any such proposed rate and adjustments shall constitute a LIBOR Successor Rate. Any such amendment shall become effective at 5:00 p.m. on the fifth Business Day after the Administrative Agent shall have posted such proposed amendment to all Lenders and the Borrower unless, prior to such time, Lenders comprising the Required Lenders have delivered to the Administrative Agent written notice that such Required Lenders object to such amendment.”
(f)    A new Section 3.03(e) is hereby added as follows:

    “(e)     If, at the end of any Interest Period, relevant interest payment date or payment period for interest calculated, no LIBOR Successor Rate has been determined in accordance with clauses (c) or (d) of this Section 3.03 and the circumstances under clauses (c)(i) or (c)(iii) above exist or the Scheduled Unavailability Date has occurred (as applicable), the Administrative Agent will promptly so notify the Borrower and each Lender. Thereafter, (x) the obligation of the Lenders to make or maintain Eurodollar Rate Loans shall be suspended, (to the extent of the affected Eurodollar Rate Loans, Interest Periods, interest payment dates or payment periods), and (y) the 
    6

Eurodollar Rate component shall no longer be utilized in determining the Base Rate, until the LIBOR Successor Rate has been determined in accordance with clauses (c) or (d). Upon receipt of such notice, the Borrower may revoke any pending request for a Borrowing of, conversion to or continuation of Eurodollar Rate Loans (to the extent of the affected Eurodollar Rate Loans, Interest Periods, interest payment dates or payment periods) or, failing that, will be deemed to have converted such request into a request for a Committed Borrowing of Base Rate Loans (subject to the foregoing clause (y)) in the amount specified therein.”

(g)    Exhibit C to the Credit Agreement is hereby deleted in its entirety and replaced by Exhibit C attached hereto.  

2.    Reaffirmation of Guaranty.  

    (a)      Each Guarantor hereby reaffirms its guarantee of all obligations of the Borrower to the Agent and the Lenders as such obligations arise pursuant to the Credit Agreement and the Loan Documents (the “Reaffirmation”).

    (b)      Each Guarantor represents and warrants to the Agent that (i) no default exists under the Credit Agreement or the Loan Documents or will exist with the giving of notice, the passage of time or both, (ii) all of the terms, conditions, obligations, agreements, warranties and representations contained in the Credit Agreement and the Loan Documents remain true and accurate and are hereby ratified and confirmed in all material respects (except that to the extent that any term, condition, obligation, agreement, warranty and representation is already qualified by materiality, in which case, such any term, condition, obligation, agreement, warranty and representation shall be true and correct as written as of such date), (iii) nothing in the Credit Agreement or any Loan Document shall operate to release it from any of its liability to pay any and all sums it owes to the Lender or to perform all of the terms, conditions, obligations and agreements contained in the Credit Agreement and the Loan Documents, (iv) the debt evidenced by the notes issued in connection with the Credit Agreement and the other Loan Documents is a valid debt of the Borrower owed to the Lenders and neither Borrower nor it has any defense, setoff, counterclaim or independent action against Agent or any Lender of any kind, whether relating to the Credit Agreement, any Loan Document or otherwise.

    (c)      Each Guarantor represents and warrants to Agent that (i) it has the power and authority to enter into this Agreement and to reaffirm its guarantee of all obligations of the Borrower to the Agent or the Lenders, as such obligations arise pursuant to the Credit Agreement and the Loan Documents, (ii) it has taken all necessary corporate action to authorize this Reaffirmation and the transactions contemplated hereby and (iii) this Reaffirmation, any related documents to which it is a party and the Loan Documents to which it is a party, are its valid and binding obligations, enforceable in accordance with their terms.

    (d)      Each Guarantor represents and warrants to Agent that the consummation of the transactions contemplated by this Reaffirmation (i) is not prevented by, nor does it conflict with or result in a breach of terms, conditions or provisions of its organizational documents, or any evidence of indebtedness, agreement or instrument of whatever nature to which it is a party or by which it is bound, (ii) does not constitute a default under any of the foregoing, and (iii) does not violate any federal, state, local or foreign law, regulation or order or any order of any court or agency which is binding upon it.
    7

    (e)     Each Guarantor reaffirms that any grant and pledge of security interests by it in its assets pursuant to the Credit Agreement and the Loan Documents secures all Obligations and continues in full force and effect. 

3.    Conditions to Effectiveness of Fourth Amendment.  The effectiveness of this Agreement is subject to the satisfaction of the following conditions precedent:

(a)    Agent’s receipt of the following, each of which shall be originals or telecopies (followed promptly by originals) unless otherwise specified, each properly executed by a Responsible Officer of the signing Loan Party, each dated as of the date hereof and each in form and substance reasonably satisfactory to Agent:

    (i)    executed counterparts of this Agreement, sufficient in number for distribution to Lenders and the Borrower;

    (ii)    such documents and certifications as the Agent may reasonably require to evidence that each Loan Party is duly organized or formed, and that each Loan Party is validly existing, in good standing (where such concept is applicable) and qualified to engage in business in each jurisdiction where its ownership, lease or operation of properties or the conduct of its business requires such qualification, except to the extent that failure to do so could not reasonably be expected to have a Material Adverse Effect.

(b)    the Borrower shall have paid the reasonable attorney’s fees of Agent’s counsel.

(c)      Borrower shall have paid to Administrative Agent, for the account of each of the Lenders that consent to this Amendment (including Bank of America), an amendment fee in an amount equal to ten basis points (10 bps) times the aggregate Commitment of all consenting Lenders.

4.    Miscellaneous.  

    (a)  This Agreement may be executed in any number of counterparts (including those delivered by facsimile or other electronic means), each of which shall be deemed to be an original, and all of which shall collectively constitute a single agreement, fully binding and enforceable against the parties hereto.

    (b)  Except as specifically amended by the terms of this Agreement, all terms and conditions set forth in the Credit Agreement and the other Loan Documents shall remain in full force and effect and none of the rights or obligations of any party thereto shall be modified in any manner.

    (c)  This Agreement shall be binding upon the parties hereto and their respective successors and assigns.

    (d)  This Agreement shall be governed by and construed in accordance with the laws of the State of New York.

    8

[Signature page to follow]

    9

    IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first written above.

BORROWER:                    LYDALL, INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer
                        
[Signature Page to Fourth Amendment]

GUARANTORS:                LYDALL THERMAL/ACOUSTICAL, INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer

        

                        LYDALL PERFORMANCE MATERIALS, INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer        

                        LYDALL INTERNATIONAL, INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer            

                        SOUTHERN FELT COMPANY, INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer    

                        LYDALL NORTH AMERICA, LLC

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer    

[Signature Page to Fourth Amendment]

GUARANTORS:    LYDALL PERFORMANCE MATERIALS, (US) INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer    

        
                        LYDALL SEALING SOLUTIONS, INC.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer    
        

                        SUSQUEHANNA CAPITAL ACQUISITION CO.

By:                            
Name:    Chad A. McDaniel
Title:    Executive Vice President, General Counsel & Chief Administrative Officer    

[Signature Page to Fourth Amendment]

bank of america, n.a., as Administrative Agent
By:      
Name:  
Title:  

    
BANK OF AMERICA, N.A., 
[Signature Page to Fourth Amendment]

as a Lender, L/C Issuer and Swingline Lender

By:                            
Name:    
Title:    

    LENDERS:                Wells fargo bank, n.a.,
[Signature Page to Fourth Amendment]

as a Lender

By:                            
Name:    Barbara A. Keegan
Title:    Senior Vice President

    
LENDERS:                    jpmorgan chase bank, n.a.,
[Signature Page to Fourth Amendment]

as a Lender

By:                            
Name:                            
Title:                            

LENDERS:                    KEYBANK national association
[Signature Page to Fourth Amendment]

as a Lender

By:                            
Name:                            
Title:                            
LENDERS:                    SANTANDER Bank, n.a.,
[Signature Page to Fourth Amendment]

as a Lender

By:                            
Name:                            
Title:                            
LENDERS:                    TD Bank, n.a.,
[Signature Page to Fourth Amendment]

as a Lender

By:                            
Name:                            
Title:                            
LENDERS:                    WEBSTER BANK, nATIONAL ASSOCIATION,
[Signature Page to Fourth Amendment]

as a Lender

By:                            
Name:                            
Title:                            

[Signature Page to Fourth Amendment]

Exhibit C
Compliance Certificate

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