Document:

EX-10.1

 Exhibit 10.1 

SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT 

This Second Amendment to Third Amended and Restated Credit Agreement, dated as of June 5, 2019 (this “Amendment”), is
among Altair Engineering Inc. (the “Borrower”), the Lenders party hereto, and JPMorgan Chase Bank, N.A., as Administrative Agent (in such capacity, the “Administrative Agent”). 

RECITAL 
 The
Borrower, the Lenders party thereto and the Administrative Agent are parties to a Third Amended and Restated Credit Agreement dated as of October 18, 2017 (as it may be amended or modified from time to time, the “Credit
Agreement”). The Borrower desires to amend the Credit Agreement as set forth herein and the Lenders are willing to do so in accordance with the terms hereof. Capitalized terms used herein, but not otherwise defined shall have the meanings
ascribed to them in the Credit Agreement. 
 TERMS 

In consideration of the premises and of the mutual agreements herein contained, the parties agree as follows: 

ARTICLE 1. 
 AMENDMENTS

 Upon the satisfaction of the conditions set forth in Article 4 hereof, the Credit Agreement shall be amended as follows: 

1.1    The following definitions are added to Section 1.01 of the Credit Agreement in their respective alphabetical
location: 
 “Convertible Senior Notes” means the Borrower’s 0.25% Convertible Senior Notes in the principal amount of
$200,000,000 (or $230,000,000 if the underwriters’ option to purchase additional Convertible Senior Notes on the same terms is exercised in full), due June 1, 2024. 

“Convertible Securities” means any Indebtedness of the Borrower or any Subsidiary that is or will become, upon the occurrence
of certain specified events or after the passage of a specified amount of time, (a) convertible into, or exchangeable for, Qualified Equity Interests of the Borrower (and cash in lieu of fractional shares), call options, warrants, rights or
obligations to purchase (or substantially equivalent derivative transactions) that are exercisable for Qualified Equity Interests of the Borrower and/or cash (in an amount determined by reference to the price of such Equity Interests) and/or
(b) sold as units with call options, warrants, rights or obligations to purchase (or substantially equivalent derivative transactions) that are exercisable for Qualified Equity Interests of the Borrower and/or cash (in an amount determined by
reference to the price of such Equity Interests). 
 “Dividing Person” has the meaning assigned to it in the definition of
“Division.” 
 “Division” means the division of the assets, liabilities and/or obligations of a Person (the
“Dividing Person”) among two or more Persons (whether pursuant to a “plan of division” or similar arrangement), which may or may not include the Dividing Person and pursuant to which the Dividing Person may or may not
survive. 

 “Division Successor” means any Person that, upon the consummation of a
Division of a Dividing Person, holds all or any portion of the assets, liabilities and/or obligations previously held by such Dividing Person immediately prior to the consummation of such Division. A Dividing Person which retains any of its assets,
liabilities and/or obligations after a Division shall be deemed a Division Successor upon the occurrence of such Division. 

“Liquidity” at any time, the sum of Unrestricted Cash and Cash Equivalents plus the amount that could be but is not borrowed
under Section 2.01. 
 “Permitted Bond Hedge Transaction” means (a) any call option or capped call option (or
substantively equivalent derivative transaction) on the common stock of the Borrower (or other securities or property following a merger event, reclassification or other change of the common stock of the Borrower) purchased by the Borrower or any of
its Subsidiaries in connection with an incurrence of Convertible Securities,, and (b) any call option or capped call option (or substantively equivalent derivative transaction) replacing or refinancing the foregoing; provided that (x) the
sum of (i) the purchase price for any Permitted Convertible Indebtedness Call Transaction it is refinancing or replacing, if any, minus (ii) the cash proceeds received upon the termination or the retirement of the Permitted Convertible
Indebtedness Call Transaction it is replacing or refinancing, if any, less (y) the sum of (i) the cash proceeds from the sale of the related Permitted Warrant Transaction plus (ii) the cash proceeds from the Permitted Warrant
Transaction refinancing or replacing such related Permitted Warrant Transaction, if any, minus (iii) the amount paid upon termination or retirement of such related Permitted Warrant Transaction, if any, does not exceed the Net Proceeds from the
incurrence of the related Convertible Securities. 
 “Permitted Convertible Indebtedness Call Transaction” means any
Permitted Bond Hedge Transaction and any Permitted Warrant Transaction. 
 “Permitted Warrant Transaction” means any call
options, warrants or rights to purchase (or substantively equivalent derivative transactions) on common stock of the Borrower (or other securities or property following a merger event, reclassification or other change of the common stock of the
Borrower) purchased or sold by the Borrower or any of its Subsidiaries concurrently with a Permitted Bond Hedge Transaction. 

“Qualified Equity Interests” means any Equity Interests other than Disqualified Stock. 

“Second Amendment” means the Second Amendment to the Third Amended and Restated Credit Agreement dated as of the Second
Amendment Effective Date by and among the Borrower, the Lenders party thereto and the Administrative Agent. 
 “Second Amendment
Effective Date” means June 5, 2019. 
 “Senior Secured Leverage Ratio” shall mean, at any time, the ratio of
(a) Consolidated Net Indebtedness at such time that is secured by a Lien on any assets (including Equity Interests) of any of the Borrower or any of its Subsidiaries to (b) Consolidated EBITDA as calculated for the four consecutive Fiscal
Quarters of the Borrower most recently ended. 
 1.2    The following definitions in Section 1.01 of the Credit
Agreement are restated as follows: 
 “Consolidated EBITDA” means, with respect to any period, Consolidated Net Income for
such period plus, to the extent deducted from revenues in determining such Consolidated Net Income, without duplication, (a) Consolidated Interest Expense, (b) expense for income taxes, (c) depreciation, (d)

  
 2 

 
amortization, (e) non-cash charges, including the Option Acceleration Non-Cash Charge, but excluding any such non-cash charge to the extent that it represents an accrual or reserve for potential cash items in any future period or the amortization of a prepaid cash item that was paid in a prior period and any non-cash charge that relates to the write-down or write-off of inventory, (f) losses from the sale of assets incurred other than in the ordinary course of business, (g) non-recurring severance and restructuring charges in an aggregate amount not exceeding $2,000,000 in any twelve (12) month period incurred in connection with Permitted Acquisitions, (h) reasonable
transaction fees, expenses and other charges (including payments due to acceleration of compensation arrangements) related to the issuance of Equity Interests or Indebtedness of the Companies and Permitted Acquisitions (whether or not successfully
consummated), (i) extraordinary losses, and (j) any cash charges relating to any redemption of Equity Interests, minus, to the extent included in Consolidated Net Income for such period, extraordinary gains (as determined in accordance with
GAAP), non-cash items of income and gains from the sale of assets realized other than in the ordinary course of business, plus the amount of any increase (or minus the amount of any decrease) in deferred
revenue for such period, all calculated for the Companies on a consolidated basis. 
 “Equity Interests” means shares of
capital stock, partnership interests, membership interests in a limited liability company, beneficial interests in a trust or other equity ownership interests in a Person, and any warrants, options or other rights entitling the holder thereof to
purchase or acquire any such equity interest, but excluding (a) any debt securities convertible or exchangeable into any of the foregoing (including Convertible Securities) and (b) any Permitted Convertible Indebtedness Call Transactions.

 “Material Indebtedness” means Indebtedness (other than the Loans and Letters of Credit), or obligations in respect of
one or more Swap Agreements, of any one or more of the Companies in an aggregate principal amount exceeding $5,000,000. For purposes of determining Material Indebtedness, the “principal amount” of the obligations of any Company in respect
of any Swap Agreement at any time shall be the maximum aggregate amount (giving effect to any netting agreements) that such Company would be required to pay if such Swap Agreement were terminated at such time. 

“Termination Date” means the earlier of (a) December 15, 2023 and (b) the date of the termination of the
Revolving Commitment. 
 1.3    Each reference to “Leverage Ratio” in the definition of Applicable Margin, the
definition of Permitted Acquisition and in Section 2.23 to “Leverage Ratio” is replaced with “Senior Secured Leverage Ratio”, respectively, and the reference in Section 2.23 to “Section 6.13” is replaced
with “Section 6.14”. 
 1.4    Section 1.04 of the Credit Agreement is amended by (a) replacing the
reference therein to “the Interest Coverage Ratio and Leverage Ratio” with “the Interest Coverage Ratio, the Leverage Ratio and the Senior Secured Leverage Ratio, and (b) adding the following to the end thereof: “For the
avoidance of doubt, and without limitation of the foregoing, Convertible Securities shall at all times be valued at the full stated principal amount thereof and shall not include any reduction or appreciation in value of the shares deliverable upon
conversion thereof. Notwithstanding anything to the contrary contained in Section 1.04 or in the definition of “Capital Lease Obligations”, all obligations of the Borrower and its Subsidiaries that are or would have been treated as
operating leases as determined in accordance with GAAP immediately prior to the issuance of the Accounting Standards Update 2016-02, Leases (Topic 842) by the Financial Accounting Standards Board shall not be
treated as capital or finance leases hereunder due to such issuance, whether or not such obligations were in effect as of the date such update was issued and regardless of whether GAAP requires such obligations to be treated as capitalized lease
obligations or finance lease obligations in the financial statements.” 

  
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 1.5    Section 5.11 of the Credit Agreement is deleted. 

1.6    Section 6.01 of the Credit Agreement is restated as follows: 

SECTION 6.01 Indebtedness. The Borrower will not, nor will it permit any Subsidiary to, create, incur, assume or permit to exist any
Indebtedness, except: 
 (a)     Indebtedness created hereunder; 

(b)    Indebtedness existing on the Second Amendment Effective Date and set forth in Schedule 6.01 and extensions,
renewals and replacements of any such Indebtedness that do not increase the outstanding principal amount thereof; 

(c)    Indebtedness of any Company incurred to finance the acquisition, construction or improvement of any fixed or
capital assets, including Capital Lease Obligations and any Indebtedness assumed in connection with the acquisition of any such assets or secured by a Lien on any such assets prior to the acquisition thereof, and extensions, renewals and
replacements of any such Indebtedness that do not increase the outstanding principal amount thereof; provided that (i) such Indebtedness is incurred prior to or within 90 days after such acquisition or the completion of such construction or
improvement and (ii) the aggregate principal amount of Indebtedness permitted by this clause (c) shall not exceed $10,000,000 (exclusive of the Indebtedness described on Schedule 6.01(c) hereto, provided that the Indebtedness described on
Schedule 6.01(c) may not be increased (as reduced from time to time) or extended) at any time outstanding; 

(d)    Unsecured Indebtedness not to exceed $1,000,000 in aggregate principal amount at any time outstanding owing by any
Foreign Subsidiary to the Borrower; 
 (e)    Indebtedness not to exceed $12,000,000 in aggregate principal amount at
any time outstanding owing by any Foreign Subsidiary; 
 (f)    Indebtedness in connection with Swap Agreements and Swap
Agreement Obligations permitted under Section 6.05; 
 (g)    Indebtedness in connection with the investments
permitted under Section 6.04; 
 (h)    Indebtedness in connection with the redemptions by the Borrower of its
Equity Interests pursuant to Sections 6.06(c) or (d); 
 (i)     Intercompany Indebtedness among the Borrower and its
Domestic Subsidiaries, provided that any such Indebtedness owing by the Borrower is subordinated to the Secured Obligations on terms acceptable to the Administrative Agent; 

(j)    Matured and contingent obligations under the Indemnity Agreement in an aggregate amount not to exceed $5,000,000;

 (k)    The Deferred Runtime Payment; and 

  
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 (l)    Other unsecured Indebtedness not to exceed $250,000,000 in
aggregate principal amount at any time outstanding. 
 1.7    Reference in Section 6.03(a)(i) of the Credit
Agreement to “$500,000” is replaced with “$5,000,000” and the word “and” prior to clause (vi) is deleted and the following is added at the end of the existing language to read as follows “and (vii) the
settlement or early termination of any Permitted Convertible Indebtedness Call Transaction”. 
 1.8    The
following new Section 6.03(c) is added to the Credit Agreement: 
 (c)    The Borrower will not, and will not
permit any of its Subsidiaries to, consummate a Division as the Dividing Person, without the prior written consent of Administrative Agent. Without limiting the foregoing, if any Loan Party that is a limited liability company consummates a Division
(with or without the prior consent of Administrative Agent as required above), each Division Successor shall be required to comply with the obligations set forth in Section 5.09 and the other further assurances obligations set forth in the Loan
Documents and become a Loan Party under this Agreement and the other Loan Documents. 
 1.9    Section 6.04 of the
Credit Agreement is restated as follows: 
 SECTION 6.04 Investments, Loans, Advances, Guarantees and Acquisitions. The Borrower will
not, nor will it permit any Subsidiary to, purchase, hold or acquire (including pursuant to any merger with any Person that was not a Wholly-Owned Subsidiary prior to such merger) any Equity Interests, evidences of indebtedness or other securities
(including any option, warrant or other right to acquire any of the foregoing) of, make or permit to exist any loans or advances to, Guarantee any obligations of, or make or permit to exist any investment or any other interest in, any other Person,
or make any Acquisition, except: 
 (a)    Permitted Investments; 

(b)    investments existing on the Second Amendment Effective Date and set forth in
Schedule 6.04, without any increase in the outstanding amount thereof (without giving effect to any write down or decrease in the value thereof); 

(c)    Guarantees constituting Indebtedness permitted by Section 6.01; 

(d)    the redemption by the Borrower of its Equity Interests pursuant to Restricted Payments permitted under
Sections 6.06(c) or (d); 
 (e)    investments in Foreign Subsidiaries (excluding Permitted Acquisitions),
provided that (i) the aggregate amount paid or payable for all such acquisitions shall not exceed $5,000,000 in the aggregate (based on the amount when made, and without giving effect to any write down or decrease in the value thereof)
during the term of this Agreement, and (ii) no Event of Default or Default exists or would be caused thereby; 

(f)    investments in Domestic Subsidiaries, including, without limitation, the acquisition of Equity Interests; 

(g)    Indebtedness permitted under Section 6.01(d) or (i); 

(h)    Permitted Acquisitions; 

  
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 (i)    investments by the Borrower or any Subsidiary that issued
Convertible Securities consisting of the Convertible Securities acquired in connection with the conversion or exchange of the Convertible Securities; provided that (x) to the extent such Convertible Securities are converted or exchanged into
Equity Interests, such Equity Interests shall be Qualified Equity Interests of the Borrower, and (y) to the extent such conversion or exchange involves any cash payment or any other payment not consisting of Qualified Equity Interests of the
Borrower, no Default exists or would be caused thereby and Liquidity pro forma giving effect to such payment is greater than $25,000,000; 

(j)    investments represented by Permitted Convertible Indebtedness Call Transactions; and 

(k)    other investments not to exceed $10,000,000 in the aggregate (based on the amount when made, and without giving
effect to any write down or decrease in the value thereof) during the term of this Agreement, provided that if on a pro forma basis for the investment, the Leverage Ratio would be equal to or greater than 2.00:1.00, then such investments shall be
limited to $2,000,000 in the aggregate, provided in either case no Event of Default or Default exists or would be caused thereby. 

1.10    Section 6.06 of the Credit Agreement is restated as follows: 

SECTION 6.06 Restricted Payments. The Borrower will not, nor will it permit any Subsidiary to, declare or make, or agree to pay or
make, directly or indirectly, any Restricted Payment, except (a) the Borrower may declare and pay dividends with respect to its Equity Interests payable solely in additional shares of its common Equity Interests, redeem Indebtedness solely with
the issuance of Qualified Equity Interests or purchase, redeem, retire, acquire, cancel or terminate any debt securities convertible or exchangeable for Equity Securities with the issuance of Qualified Equity Interests and cash in lieu of fractional
shares of any such Qualified Equity Interests, (b) Subsidiaries may declare and pay dividends ratably with respect to their Equity Interests, (c) if no Default exists or would be caused thereby (both before and after giving effect to any
of the following redemptions, including without limitation each installment thereon), the Borrower may redeem its Equity Interests issued as part of the consideration for any Permitted Acquisition in an amount not to exceed $20,000,000 in the
aggregate in any Fiscal Year, (d) if no Default exists or would be caused thereby (both before and after giving effect to any such Restricted Payment), other Restricted Payments (other than in connection with a purchase, redemption, call,
defeasance or prepayment of Indebtedness for cash pursuant to Section 6.11(e)), provided that such other Restricted Payments shall not exceed $20,000,000 in the aggregate in any Fiscal Year if, on a pro forma basis after giving effect to such
Restricted Payment, the Senior Secured Leverage Ratio is greater than 1.50:1.0, and (e) a purchase, redemption, call, defeasance or prepayment of the Senior Convertible Notes if permitted under Section 6.11(e). 

1.11    Section 6.11 of the Credit Agreement is restated as follows: 

Section 6.11 Prepayment of Indebtedness. The Borrower will not, nor will it permit any Subsidiary to, directly or indirectly,
voluntarily purchase, redeem, call, defease or prepay any principal of, premium, if any, interest or other amount payable in respect of any Indebtedness prior to its scheduled maturity, other than (a) the Secured Obligations;
(b) Indebtedness secured by a Permitted Lien if the asset securing such Indebtedness has been sold or otherwise disposed of in accordance herewith; (c) Indebtedness permitted hereunder upon any permitted refinancing thereof in accordance
therewith; (d) the redemption or other prepayment of the Senior Convertible Notes solely with the issuance of Qualified Equity Interests, and (e) the Senior Convertible Notes if no Default exists or would be caused thereby and, to the
extent such purchase, redemption, call, defeasance or prepayment involves payment in cash, Liquidity pro forma giving effect to such payment is greater than $25,000,000. 

  
 6 

 1.12    Section 6.13 of the Credit Agreement is restated as follows:

 SECTION 6.13 Leverage Ratio. The Borrower will not permit the Leverage Ratio to be greater than 5.00 to 1.0 as of the end of any
Fiscal Quarter. 
 1.13    The following new Section 6.14 is added to the Credit Agreement: 

SECTION 6.14 Senior Secured Leverage Ratio. The Borrower will not permit the Senior Secured Leverage Ratio to be greater than 3.00 to
1.0 as of the end of any Fiscal Quarter. 
 ARTICLE 2. 

REPRESENTATIONS. 
 In order
to induce the Lenders and the Administrative Agent to enter into this Amendment, each Loan Party represents and warrants to each Lender and the Administrative Agent that the following statements are true, correct and complete as of the Second
Amendment Effective Date: 
 2.1    The execution, delivery and performance of this Amendment are within its powers and
have been duly authorized by it. 
 2.2    This Amendment is the legal, valid and binding obligation of it, enforceable
against it in accordance with the terms hereof, subject to applicable bankruptcy, insolvency, reorganization, moratorium or other laws affecting creditors’ rights generally and subject to general principles of equity, regardless of whether
considered in a proceeding in equity or at law. 
 2.3    After giving effect to the amendments herein contained, the
representations and warranties of each Loan Party set forth in the Credit Agreement or in any other Loan Document shall be true and correct in all material respects on and as of the Second Amendment Effective Date (it being understood and agreed
that any representation or warranty which by its terms is made as of a specified date shall be required to be true and correct in all material respects only as of such specified date, and that any representation or warranty which is subject to any
materiality qualifier shall be required to be true and correct in all respects). 
 2.4    After giving effect to the
amendments herein contained, no Default shall have occurred and be continuing. 
 ARTICLE 3. 

CONDITIONS PRECEDENT. 

This Amendment shall be effective as of the date hereof when each of the following conditions is satisfied or waived by the Administrative
Agent: 
 3.1    This Amendment shall be executed by the Borrower and the Required Lenders. 

3.2    The Guarantors shall have signed the Consent and Agreement hereto. 

3.3    The Administrative Agent shall have received such other documents, and such other conditions shall be satisfied,
including the final terms of the Convertible Senior Note, as requested by the Administrative Agent. 

  
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 ARTICLE 4. 

MISCELLANEOUS. 

4.1    References in the Loan Documents to the Credit Agreement shall be deemed to be references to the Credit Agreement
as amended hereby and as further amended from time to time. This Amendment is a Loan Document. 
 4.2    Except as
expressly amended hereby, the Borrower agrees that the Loan Documents are ratified and confirmed and shall remain in full force and effect and that it has no set off, counterclaim, defense or other claim or dispute with respect to any of the
foregoing. Nothing herein shall be deemed to entitle the Borrower to any future consent to, or waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement
or any other Loan Document in similar or different circumstances. 
 4.3    This Amendment may be signed upon any number
of counterparts with the same effect as if the signatures thereto and hereto were upon the same instrument and signatures sent by facsimile or other electronic imaging shall be enforceable as originals. 

4.4    This Amendment is governed by, and construed in accordance with, the law of the State of Michigan. 

[Signature Pages Follow] 

  
 8 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by
their respective authorized officers as of the day and year first above written. 
  

					
	ALTAIR ENGINEERING INC.
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	Chief Executive Officer

  
 SIGNATURE
PAGE - SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT – ALTAIR
ENGINEERING INC. 

 
					
	JPMORGAN CHASE BANK, N.A.,
	as a Lender and as Administrative Agent
		
	By:	 	 /s/ Daniel J. Maniaci

		 	Name:	 	Daniel J. Maniaci
		 	Title:	 	VP

  
 SIGNATURE
PAGE - SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT – ALTAIR
ENGINEERING INC. 

 
					
	ROYAL BANK OF CANADA,
	as Syndication Agent and as a Lender
		
	By:	 	 /s/ Sheldon Pinto

		 	Name:	 	Sheldon Pinto
		 	Title:	 	Authorized Signatory

  
 SIGNATURE
PAGE - SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT – ALTAIR
ENGINEERING INC. 

 CONSENT AND AGREEMENT 

Each of the undersigned hereby fully consents to the terms and provisions of the Second Amendment to Third Amended and Restated Credit
Agreement dated as of June 5, 2019 (the “Second Amendment”) among Altair Engineering Inc. (the “Borrower”), the Lenders party hereto, and JPMorgan Chase Bank, N.A., as Administrative Agent, and the consummation of
the transactions contemplated by the Second Amendment, and acknowledges and agrees to all terms and provisions of the Second Amendment applicable to it, including without limitation all covenants, representations and warranties, releases,
indemnifications, and all other terms and provisions, and further confirms and agrees that the Loan Documents, including without limitation the Credit Agreement as amended by the Second Amendment, are ratified and confirmed and shall remain in full
force and effect and that it has no set off, counterclaim, defense or other claim or dispute with respect to any of the foregoing. 

[Signature Pages Follow] 

 
					
	ALTAIR ENGINEERING INC.
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	Chief Executive Officer
	
	ALTAIR PRODUCT DESIGN, INC.
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President
	
	ILUMISYS, INC.
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President
	
	ALTAIR BELLINGHAM II, LLC
	By: Altair Engineering Inc., its sole member
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President
	
	DATAWATCH CORPORATION
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President

  
 SIGNATURE
PAGE - CONSENT AND AGREEMENT – GUARANTORS – SECOND AMENDMENT TO THIRD AMENDED
AND RESTATED CREDIT AGREEMENT – ALTAIR ENGINEERING INC. 

 
					
	ALTAIR BELLINGHAM LLC
	By: Altair Engineering Inc., its sole member
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President
	
	SOLIDTHINKING, INC.
		
	By:	 	 /s/ Steve M. Rivkin

		 	Name:	 	Steve M. Rivkin
		 	Title:	 	Secretary
	
	WEYV, INC.
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President
	
	RUNTIME DESIGN AUTOMATION
		
	By:	 	 /s/ James Scapa

		 	Name:	 	James Scapa
		 	Title:	 	President

  
 SIGNATURE
PAGE - CONSENT AND AGREEMENT – GUARANTORS – SECOND AMENDMENT TO THIRD AMENDED
AND RESTATED CREDIT AGREEMENT – ALTAIR ENGINEERING INC.EX-4.1

 Exhibit 4.1 

AMERICAN MIDSTREAM PARTNERS, LP 

AMERICAN MIDSTREAM FINANCE CORPORATION 

and 
 the Guarantors named herein

 8.500% SENIOR NOTES DUE 2021 

SIXTH SUPPLEMENTAL INDENTURE 

DATED AS OF JUNE 5, 2019 

WELLS FARGO BANK, NATIONAL ASSOCIATION, 

Trustee 

 This SIXTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of
June 5, 2019, is among American Midstream Partners, LP, a Delaware limited partnership (the “Company”), American Midstream Finance Corporation, a Delaware corporation (“Finance Corp.” and, together with the Company, the
“Issuers”), each of the parties identified under the caption “Guarantors” on the signature page hereto (the “Guarantors”) and Wells Fargo Bank, National Association, a national banking association, as trustee (the
“Trustee”). Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture (as defined below). 

RECITALS 
 WHEREAS, the Issuers,
the initial Guarantors and the Trustee entered into an Indenture, dated as of December 28, 2016 (as amended, restated, supplemented, waived or otherwise modified from time to time, the “Indenture”), pursuant to which the Issuers have
issued $425,000,000 in the aggregate principal amount of 8.500% Senior Notes due 2021 (the “Notes”); 
 WHEREAS, on March 17,
2019, the Company and its general partner, American Midstream GP, LLC, a Delaware limited liability company (the “General Partner”), entered into an Agreement and Plan of Merger with Anchor Midstream Acquisition, LLC, a Delaware limited
liability company (“Parent”), Anchor Midstream Merger Sub, LLC, a Delaware limited liability company (“Merger Sub”), and High Point Infrastructure Partners, LLC, a Delaware limited liability company, pursuant to which Merger Sub
will merge with and into the Company, with the Company surviving as a direct wholly-owned subsidiary of the General Partner and Parent (the “Merger”); 

WHEREAS, the Issuers desire to (i) amend the covenant in Section 4.03 of the Indenture so that the Company will no longer be
required to file certain reports with the Securities and Exchange Commission following consummation of the Merger; (ii) amend the covenant in Section 4.11 of the Indenture to remove certain requirements that will no longer be applicable to
the Company following the Company’s conversion from a limited partnership to a member-managed limited liability company, which is expected to occur after consummation of the Merger, and to add a requirement for the Board of Directors of the
Company to obtain a fairness opinion in connection with certain Affiliate Transactions; and (iii) amend Section 6.01 of the Indenture, reducing the number of days of non-compliance by the Company
with its obligations under Section 4.03 of the Indenture that would constitute an Event of Default (collectively, the “Amendments”); 

WHEREAS, Section 9.02 of the Indenture provides that the Issuers, the Guarantors and the Trustee may amend or supplement the Indenture or
the Notes with the consent of the Holders of at least a majority in principal amount of the then outstanding Notes; 
 WHEREAS, (i) the
Issuers have solicited the consent of the Holders of the outstanding Notes pursuant to and in accordance with the Consent Solicitation Statement, dated as of May 20, 2019, as amended by Amendment No. 1 to the Consent Solicitation Statement,
dated June 3, 2019 (as amended, the “Consent Solicitation Statement”), and (ii) the Issuers have received, and has delivered to the Trustee evidence of, the consent of the Holders of at least a majority in principal amount of the
then outstanding Notes to the Amendments as set forth in this Supplemental Indenture; and 

  
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 WHEREAS, all acts and things prescribed by the Indenture, by law and by the Certificate of
Incorporation and the Bylaws (or comparable constituent documents) of the Issuers, of the Guarantors and of the Trustee necessary to make this Supplemental Indenture a valid instrument legally binding on the Issuers, the Guarantors and the Trustee,
in accordance with its terms, have been duly done and performed. 
 NOW, THEREFORE, to comply with the provisions of the Indenture and in
consideration of the above premises, the Issuers, the Guarantors and the Trustee covenant and agree for the equal and proportionate benefit of the respective Holders of the Notes as follows: 

ARTICLE 1 
 Section 1.01.
This Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall be construed in connection with and as part of, the Indenture for any and all purposes. 

Section 1.02. This Supplemental Indenture shall become effective immediately upon its execution and delivery by each of the Issuers, the
Guarantors and the Trustee; provided, however, that the Amendments set forth in Article 2 of this Supplemental Indenture shall only become effective once (i) the Merger is consummated and (ii) the Issuers pay (or cause to be paid)
each consenting Holder’s pro rata portion of an aggregate consent payment in the amount of $2,125,000 to The Depository Trust Company for the benefit of the consenting Holders in accordance with the terms set forth in the Consent Solicitation
Statement (collectively, the “Conditions”). The Company shall notify the Trustee promptly in writing after the satisfaction of the Conditions. 

ARTICLE 2 
 Section 2.01.
The parties hereto agree and acknowledge that Section 1.02 of the Indenture shall be amended by inserting the term “Independent Qualified Party” in alphabetical order with its corresponding section reference being Section 4.11.

 Section 2.02. The parties hereto agree and acknowledge that Section 4.03 of the Indenture shall be amended and restated in its
entirety as follows: 
 “Reports. (a) So long as any Notes are outstanding, the Company will, in accordance with paragraph
(b) of this Section 4.03, furnish to the Trustee, the Holders and, upon its prior request, any Beneficial Owner of the Notes: 

(1) (i) within 120 days after the end of each fiscal year of the Company, an annual report containing substantially all the
information that would have been required to be contained in an annual report on Form 10-K under the Exchange Act if the Company had been a reporting company under the Exchange Act, including audited annual
financial statements of the Company and its consolidated Subsidiaries prepared in accordance with GAAP (with footnotes to such financial statements) and a report thereon by the Company’s certified independent accountants in accordance with
generally accepted auditing standards of the American Institute of Certified Public 

  
 2 

 
Accountants and a “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section; provided, however, that (x) such annual reports shall not be
required to contain any of the information required by Part II, Items 5 (Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities) and 9A (Controls and Procedures), and Part
III, Items 10 (Directors, Executive Officers and Corporate Governance), 11 (Executive Compensation), 12 (Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters), 13 (Certain
Relationships and Related Transactions, and Director Independence) and 14 (Principal Accounting Fees and Services) of Form 10-K and (y) any information contained in such annual reports with
respect to non-consolidated Subsidiaries shall be consistent with past practice; and 

(ii) within 60 days after the end of each fiscal quarter of the Company (solely with respect to the first three fiscal
quarters of each fiscal year), a quarterly report with respect to the most recent fiscal quarter and year-to-date period containing substantially all the information
that would have been required to be contained in a quarterly report on Form 10-Q under the Exchange Act if the Company had been a reporting company under the Exchange Act, including unaudited quarterly
financial statements of the Company and its consolidated Subsidiaries prepared in accordance with GAAP (with condensed footnotes to such financial statements consistent with past practice) and a “Management’s Discussion and Analysis of
Financial Condition and Results of Operations” section; provided, however, that (x) such quarterly reports shall not be required to contain any of the information required by Part I, Item 4 of Form
10-Q (Controls and Procedures) and (y) any information contained in such quarterly reports with respect to non-consolidated Subsidiaries shall be consistent
with past practice; and 
 (2) promptly from time to time, and in any event within five Business Days, after the occurrence
of any event that would be required to be reported in a current report on Form 8-K under the Exchange Act under any of the following: 

(A)    Item 1.01 (Entry into a Material Definitive Agreement); 

(B)    Item 1.02 (Termination of a Material Definitive Agreement.); 

(C)    Item 1.03 (Bankruptcy or Receivership); 

(D)    Item 2.01 (Completion of Acquisition or Disposition of Assets); 

(E)    Item 2.03 (Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant); 
 (F)    Item
2.04 (Triggering Events that Accelerate or Increase a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement); 

(G)    Item 3.03 (Material Modification to Rights of Security Holders), but only with respect to a
material modification to the rights of the Holders pursuant to this Indenture; 

  
 3 

 (H)    Item 4.02
(Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review); 

(I)    Item 5.01 (Changes in Control of Registrant); 

(J)    Item 5.02(a)(1) (Resignation of Director due to Disagreement with Registrant); 

(K)    Item 5.02(c)(1) (Name and Position of Newly Appointed Officer and Date of Appointment); or

 (L)    Item 5.03 (Changes in Fiscal Year); 

in accordance with the requirements of Form 8-K as of the date hereof, as if the Company had been a
reporting company under the Exchange Act, a current report containing substantially all the information that would have been required to be contained in such Form 8-K; provided, however, that no such report
will be required to be made available pursuant to this Section 4.03 if the Company determines in its good faith judgment that such event is not material to the Holders or the business, assets, operations, financial position or prospects of the
Company and its Restricted Subsidiaries, taken as a whole; 
 provided, however, that, with respect to reports provided pursuant to either
paragraph (a)(1) or paragraph (a)(2) of this Section 4.03, in no event will such reports be required to: 

(A)    comply with Section 302, Section 404 or Section 906 of the Sarbanes-Oxley Act of
2002, or related Items 307 and 308 of Regulation S-K promulgated by the SEC; 

(B)    comply with Item 302 of Regulation S-K promulgated by the
SEC; 
 (C)    comply with Rule 3-10 of Regulation S-X promulgated by the SEC or contain separate financial statements for the Company, Finance Corp., the Guarantors or other Subsidiaries or other Persons that would be required under (i) Rule 3-05 of Regulation S-X, (ii) Rule 3-09 of Regulation S-X, (iii) Rule 3-16 of Regulation S-X, (iv) Rule 8-04 of Regulation S-X, (v) Rule 8-05 of Regulation S-X or (vi) Section 11 of Regulation S-X, respectively, promulgated by the SEC; 

(D)    comply with Regulation G under the Exchange Act or Item 10(e) of Regulation S-K promulgated by the SEC with respect to any non-GAAP financial measures contained therein; provided, however, that any EBITDA or Adjusted EBITDA information included in
reports provided pursuant to paragraph (a)(1) of this Section 4.03 shall comply with Regulation G under the Exchange Act; 

  
 4 

 (E)    contain any segment reporting information;
provided, however, that reports provided pursuant to paragraphs (a)(1)(i) and (ii) of this Section 4.03 shall present revenue and capital expenditures on a segment basis for the periods presented in such report; 

(F)    contain any compensation or beneficial ownership information; 

(G)    comply with Item 601 of Regulation S-K promulgated by the
SEC (with respect to exhibits) or include as an exhibit copies of any agreements or other items that would be required to be filed as exhibits to a periodic report on Form 10-K or Form 10-Q or current report on Form 8-K; or 

(H)    make any adjustments to or recasts of financial information with respect to (i) either
acquisitions or divestitures to provide period-over-period comparability in any segment financial presentation or “Management’s Discussion and Analysis of
Financial Condition and Results of Operations” section included in such reports or (ii) under ASC 805-50 in connection with any common control transactions. 

The Company shall at all times comply with TIA § 314(a). 

(b)    The Company will make the reports required by paragraph (a) of this Section 4.03 available
to the Trustee, the Holders and, upon its prior request, any Beneficial Owner of the Notes that certifies to its status as a Beneficial Owner to the reasonable satisfaction of the Company, in each case by posting such reports on its website, on
Intralinks, SyndTrak, ClearPar or any comparable password-protected online data system that requires a confidentiality acknowledgment and will make such reports readily available to any Holder, any bona fide prospective investor in the Notes (which
prospective investors will be limited to QIBs that certify their status as such to the reasonable satisfaction of the Company), any bona fide securities analyst (to the extent providing analysis of investment in the Notes to investors and
prospective investors therein) or any bona fide market maker in the Notes who agrees to treat such reports as confidential or accesses such reports on Intralinks, SyndTrak, ClearPar or any comparable password-protected online data system that
requires a confidentiality acknowledgment; provided that such Holders, prospective investors, security analysts or market makers will agree to (i) treat all of the information in such reports as confidential, (ii) not use any of the
information in such reports for any purpose other than their investment or potential investment in the Notes and (iii) not publicly disclose or distribute any of the information in such reports. 

(c) The Company will be deemed to have furnished the reports required by paragraph (a) of this Section 4.03 if the
Company or any direct or indirect parent of the Company has filed the corresponding reports with the SEC via the SEC’s EDGAR filing system (or any successor system), provided, however, that in the case of filed reports of a direct or indirect
parent, such reports will be accompanied by consolidating information (which need not be audited) that explains in reasonable detail the difference between the 

  
 5 

 
information relating to such parent, on the one hand, and the information relating to the Company and its Restricted Subsidiaries on a stand-alone basis, on the other hand. 

(d)    To the extent any reports are not provided within the time periods specified in paragraph
(a) of this Section 4.03 and such reports are subsequently provided, the Company will be deemed to have satisfied its obligations with respect thereto at such time and any Default with respect thereto will be deemed to have been cured.

 (e)    The Company and the Guarantors shall furnish to the Holders and Beneficial Owners of the Notes,
prospective purchasers of the Notes and securities analysts, upon their request, the information, if any, required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act. 

(f) If the Company has designated any of its Subsidiaries as Unrestricted Subsidiaries, then, to the extent material, the
quarterly and annual financial information required by paragraph (a) of this Section 4.03 shall include a reasonably detailed presentation, either on the face of the financial statements or in the footnotes to the financial statements and
in Management’s Discussion and Analysis of Financial Condition and Results of Operations, of the financial condition and results of operations of the Company and its Restricted Subsidiaries separate from the financial condition and results of
operations of the Unrestricted Subsidiaries. 
 (g)    No later than five Business Days after the date
the annual and quarterly financial information for the prior fiscal period have been provided pursuant to Section 4.03(a)(1)(i) or 4.03(a)(1)(ii) above, the Company shall also hold live quarterly conference calls with the opportunity to ask
questions of the Company. No fewer than two Business Days prior to the date such conference call is to be held, the Company shall issue a notice through its website, Intralinks, SyndTrak, ClearPar or the other comparable password-protected online
data system through which it provides the information pursuant to paragraph (a) of this Section 4.03 announcing such quarterly conference call for the benefit of the Holders, Beneficial Owners of the Notes, bona fide prospective investors
in the Notes (which prospective purchasers shall be limited to QIB that certify their status as such to the reasonable satisfaction of the Company), bona fide securities analysts and market making financial institutions, which notice shall contain
the time and the date of such conference call and direct the recipients thereof to contact an individual at the Company (for whom contact information shall be provided in such notice) to obtain information on how to access such quarterly conference
call. The Trustee shall not be obligated to attend or participate in any such conference calls or be deemed to have actual or constructive notice of any information disclosed therein or determinable from information disclosed therein, including the
Issuers’ compliance with any of their covenants under this Indenture (as to which the Trustee is entitled to rely exclusively on an Officers’ Certificate). 

(h) Delivery of reports, information and documents to the Trustee under this Section is for informational purposes only and the
Trustee’s receipt of the foregoing shall not constitute constructive notice of any information contained therein or determinable from information contained therein, including the Issuers’ compliance with any of their covenants under this
Indenture (as to which the Trustee is entitled to rely exclusively on an Officers’ 

  
 6 

 
Certificate). The Trustee shall not be obligated to monitor or confirm, on a continuing basis or otherwise, the Issuers’ compliance with the covenants in this Indenture with respect to the
furnishing or posting of such reports, information and documents filed with the Commission or EDGAR or on a website or any online data system under this Indenture.” 

Section 2.03. The parties hereto agree and acknowledge that Section 4.11 of the Indenture shall be amended and restated in its
entirety as follows: 
 “Limitation on Transactions with Affiliates. The Company will not, and will not permit any of its
Restricted Subsidiaries to, directly or indirectly make any payment to, or sell, lease, transfer or otherwise dispose of any of its properties or assets to, or purchase any property or assets from, or enter into or make or amend any transaction,
contract, agreement, understanding, loan, advance or guarantee with, or for the benefit of, any Affiliate (each, an “Affiliate Transaction”), unless: 

(1)    the Affiliate Transaction is on terms that are no less favorable to the Company or the relevant
Restricted Subsidiary than those that would have been obtained in a comparable transaction by the Company or such Restricted Subsidiary with an unrelated Person or, if in the good faith judgment of the Board of Directors of the Company, no
comparable transaction is available with which to compare such Affiliate Transaction, such Affiliate Transaction is otherwise fair to the Company or the relevant Restricted Subsidiary from a financial point of view; and 

(2) the Company delivers to the Trustee, with respect to any Affiliate Transaction or series of related Affiliate Transactions
involving aggregate consideration in excess of $50.0 million, a resolution of the Board of Directors of the Company set forth in an Officers’ Certificate certifying that such Affiliate Transaction complies with this Section 4.11,
provided that with respect to any Affiliate Transaction or series of related Affiliate Transactions that involve an amount in excess of $80.0 million, the Board of Directors of the Company shall have also received a written opinion from an
Independent Qualified Party to the effect that such Affiliate Transaction or series of related Affiliate Transactions are fair (taken as a whole), from a financial standpoint, to the Company and such Restricted Subsidiary or is not materially less
favorable to the Company and such Restricted Subsidiary than could reasonably be expected to be obtained at the time of the Affiliate Transaction or related Affiliate Transactions in a comparable transaction by the Company or such Restricted
Subsidiary with a Person who is not an Affiliate. For the purpose of this Section 4.11, the term “Independent Qualified Party” means an investment banking firm, accounting firm or appraisal firm of nationally recognized
standing; provided, however, that such firm is not an Affiliate of the Company. 
 The following items will not be deemed to be Affiliate
Transactions and, therefore, will not be subject to the provisions of the prior paragraph of this Section 4.11: 
 (1)
any transaction or series of related transactions involving aggregate consideration of less than $10.0 million; 

  
 7 

 (2) any employment, equity award, equity option or equity appreciation
agreement or plan entered into by the Company or any of its Restricted Subsidiaries in the ordinary course of business; 

(3) transactions between or among any of the Company and its Restricted Subsidiaries; 

(4) transactions with a Person that is an Affiliate of the Company (other than an Unrestricted Subsidiary) solely because the
Company owns an Equity Interest in such Person; 
 (5) transactions effected in accordance with the JPE Merger Agreement or
other agreements that are identified or incorporated by reference in the Offering Memorandum, in each case as such agreements are in effect on the date of this Indenture, and any amendment or replacement of any of such agreements so long as such
amendment or replacement agreement is no less advantageous to the Company and its Restricted Subsidiaries in any material respect than the agreement so amended or replaced; 

(6) customary compensation, indemnification and other benefits made available to officers, directors or employees of the
Company or a Restricted Subsidiary or Affiliate of the Company, including reimbursement or advancement of out-of-pocket expenses and provisions of officers’ and
directors’ liability insurance; 
 (7) sales of Equity Interests (other than Disqualified Stock) to Affiliates of the
Company; 
 (8) Permitted Investments or Restricted Payments that are permitted by Section 4.07; 

(9) payments to the General Partner with respect to reimbursement for expenses in accordance with the Partnership Agreement as
in effect on the date of this Indenture and as it may be amended, provided that any such amendment is not less favorable to the Company in any material respect than the agreement prior to such amendment; 

(10) transactions between the Company or any of its Restricted Subsidiaries and any other Person, a director of which is also
on the Board of Directors of the Company or any direct or indirect parent company of the Company, and such common director is the sole cause for such other Person to be deemed an Affiliate of the Company or any of its Restricted Subsidiaries;
provided, however, that such director abstains from voting as a member of the Board of Directors of the Company or any direct or indirect parent company of the Company, as the case may be, on any transaction with such other Person; and 

(11) in the case of contracts for gathering, transporting, treating, processing, fractionating, refining, marketing,
distributing, storing, terminalling, purchasing, selling, blending or otherwise handling Hydrocarbons or other products, or activities or services reasonably related or ancillary thereto, or other operational contracts, any such

  
 8 

 
contracts are entered into in the ordinary course of business on terms substantially similar to those contained in similar contracts entered into by the Company or any Restricted Subsidiary and
third parties, or if neither the Company nor any Restricted Subsidiary has entered into a similar contract with a third party, then the terms are no less favorable than those available from third parties on an arm’s length basis.” 

Section 2.04. The parties hereto agree and acknowledge that Section 6.01 of the Indenture shall be amended and restated in its
entirety as follows: 
 “Events of Default. An “Event of Default” occurs if one of the following shall have occurred
and be continuing (whatever the reason for such Event of Default and whether it shall be involuntary or be effected by operation of law): 

(a) an Issuer defaults in the payment when due of interest or Additional Interest, if any, with respect to, the Notes, and such
default continues for a period of 30 days; 
 (b) an Issuer defaults in the payment of the principal of or premium, if any,
on the Notes when due at its Stated Maturity, upon optional redemption, upon required repurchase or redemption, upon declaration or otherwise; 

(c) the Company fails to comply with its obligations to repurchase Notes within the time periods set forth, or to consummate a
purchase of Notes when required, under the provisions of Section 3.09, 4.10 or 4.15, or the Company fails to comply with its obligations under the provisions of Section 5.01 hereof; 

(d) the Company fails to comply with the provisions of Section 4.03 for 90 days after notice to the Company by the Trustee
or the Holders of at least 25% in principal amount of the Notes then outstanding of such failure; 
 (e) the Company fails to
comply with any other covenant or other agreement in this Indenture or the Notes for 60 days after notice to the Company by the Trustee or the Holders of at least 25% in principal amount of the Notes then outstanding of such failure; 

(f) a default occurs under any mortgage, indenture or instrument under which there may be issued or by which there may be
secured or evidenced any Indebtedness for money borrowed by the Company or any of its Restricted Subsidiaries (or the payment of which is guaranteed by the Company or any of its Restricted Subsidiaries), whether such Indebtedness or guarantee now
exists or is created after the date of this Indenture, if such default: 
 (1) is caused by a failure to pay principal of,
or interest or premium, if any, on such Indebtedness prior to the expiration of any grace period provided in such Indebtedness (a “Payment Default”); or 

(2) results in the acceleration of such Indebtedness prior to its Stated Maturity 

and, in each case, the principal amount of any such Indebtedness, together with the 

  
 9 

 
principal amount of any other such Indebtedness under which there has been a Payment Default or the maturity of which has been so accelerated, aggregates in excess of $25.0 million;
provided, however, that if any such Payment Default is cured or waived or any such acceleration rescinded, or such Indebtedness is repaid, within a period of 60 days from the continuation of such Payment Default beyond the applicable grace period or
the occurrence of such acceleration, as the case may be, such Event of Default and any consequential acceleration of the Notes shall be automatically rescinded, so long as such rescission does not conflict with any judgment or decree; 

(g) the Company or any of its Restricted Subsidiaries fails to pay final non-appealable
judgments aggregating in excess of $25.0 million (to the extent not covered by insurance by a reputable and creditworthy insurer as to which the insurer has not disclaimed coverage), which judgments are not paid, discharged or stayed for a
period of 60 days; 
 (h) except as permitted by this Indenture, any Subsidiary Guarantee is held in any judicial proceeding
to be unenforceable or invalid or ceases for any reason to be in full force and effect or any Guarantor, or any Person acting on behalf of any Guarantor, denies or disaffirms its obligations under its Subsidiary Guarantee; 

(i) the Company, Finance Corp., any of the Company’s Restricted Subsidiaries that is a Significant Subsidiary of the
Company or any group of Restricted Subsidiaries of the Company that, taken together, would constitute a Significant Subsidiary of the Company pursuant to or within the meaning of Bankruptcy Law: 

(1) commences a voluntary case, 

(2) consents in writing to the entry of an order for relief against it in an involuntary case, 

(3) consents in writing to the appointment of a Custodian of it or for all or substantially all of its property, 

(4) makes a general assignment for the benefit of its creditors, or 

(5) admits in writing it generally is not paying its debts as they become due; and 

(j) a court of competent jurisdiction enters an order or decree under any Bankruptcy Law that: 

(1) is for relief against the Company, Finance Corp., any of the Company’s Restricted Subsidiaries that is a Significant
Subsidiary of the Company or any group of Restricted Subsidiaries of the Company that, taken together, would constitute a Significant Subsidiary of the Company in an involuntary case; 

(2) appoints a Custodian of the Company, Finance Corp., any of the 

  
 10 

 
Company’s Restricted Subsidiaries that is a Significant Subsidiary of the Company or any group of Restricted Subsidiaries of the Company that, taken together, would constitute a Significant
Subsidiary of the Company or for all or substantially all of the property of the Company, Finance Corp., any of the Company’s Restricted Subsidiaries that is a Significant Subsidiary of the Company or any group of Restricted Subsidiaries of the
Company, that, taken together, would constitute a Significant Subsidiary of the Company; or 
 (3) orders the liquidation of
the Company, Finance Corp., any of the Company’s Restricted Subsidiaries that is a Significant Subsidiary of the Company or any group of Restricted Subsidiaries of the Company that, taken together, would constitute a Significant Subsidiary of
the Company; 
 and the order or decree remains unstayed and in effect for 60 consecutive days.” 

ARTICLE 3 
 Section 3.01.
Except as specifically modified herein, the Indenture and the Notes are in all respects ratified and confirmed (mutatis mutandis) and shall remain in full force and effect in accordance with their terms with all capitalized terms used herein
without definition having the same respective meanings ascribed to them as in the Indenture. 
 Section 3.02. Except as otherwise
expressly provided herein, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Supplemental Indenture. This Supplemental Indenture is executed and accepted by the Trustee
subject to all the terms and conditions set forth in the Indenture with the same force and effect as if those terms and conditions were repeated at length herein and made applicable to the Trustee with respect hereto. The Trustee shall not be
responsible for and makes no representation as to the validity or adequacy of this Supplemental Indenture or the Notes, and it shall not be responsible for any statement or recital herein or any statement in the Notes other than its certificate of
authentication. 
 Section 3.03. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE
STATE OF NEW YORK. 
 Section 3.04. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be
an original, but all of such executed copies together shall represent the same agreement. Signatures of the parties hereto transmitted by facsimile or electronic mail in .pdf format shall be deemed to be their original signatures for all purposes.

 [NEXT PAGE IS SIGNATURE PAGE] 

  
 11 

 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as
of the date first written above. 
  

			
	AMERICAN MIDSTREAM PARTNERS, LP
		
	By:	 	 American Midstream GP, LLC,
 its sole general
partner

		
	By:	 	/s/ Eric T. Kalamaras
	Name:	 	Eric T. Kalamaras
	Title:	 	Senior Vice President and Chief Financial Officer

  

			
	AMERICAN MIDSTREAM FINANCE CORPORATION
		
	By:	 	/s/ Eric T. Kalamaras
	Name:	 	Eric T. Kalamaras
	Title:	 	Senior Vice President and Chief Financial Officer

  

			
	 Guarantors:
  

American Midstream, LLC
 American Midstream (Alabama Gathering),
LLC
 American Midstream (Alabama Intrastate), LLC
 American
Midstream (AlaTenn), LLC
 American Midstream (Burns Point), LLC

American Midstream (Lavaca), LLC
 American Midstream (Louisiana
Intrastate), LLC
 American Midstream (Mississippi), LLC

American Midstream (SIGCO Intrastate), LLC
 American Midstream
(Tennessee River), LLC
 American Midstream AMPAN, LLC
 American
Midstream Bakken, LLC
 American Midstream Chatom, LLC
 American
Midstream Chatom Unit 1, LLC
 American Midstream Chatom Unit 2, LLC

American Midstream Costar, LLC
 American Midstream Delta House,
LLC
 American Midstream East Texas Rail, LLC
 American
Midstream Emerald, LLC
 American Midstream Gas Solutions, LP

		
	By:	 	 American Midstream Gas Solutions GP, LLC,
 its
general partner

	American Midstream Gas Solutions GP, LLC

  
 [Signature Page to
Sixth Supplemental Indenture] 

			
	 American Midstream Gas Solutions LP, LLC

American Midstream Madison, LLC
 American Midstream Marketing,
LLC
 American Midstream Mesquite, LLC
 American Midstream Midla
Reconfiguration, LLC
 American Midstream Offshore (Seacrest) LP

		
	By:	 	 American Midstream, LLC,
 its general
partner

 
			
	 American Midstream Onshore Pipelines, LLC

American Midstream Permian, LLC
 American Midstream Piney Woods,
LLC
 American Midstream Republic, LLC
 American Midstream
Transtar Gas Processing, LLC
 AMID Crude Oil Services LLC
 AMID
Crude Oil Storage LLC
 AMID Crude Trucking LLC
 AMID Energy
Products Supply LLC
 AMID Liquids Trucking LLC
 AMID Merger
LP

		
	By:	 	 American Midstream, LLC,
 its general
partner

 
			
	 AMID Payment Services, LLC
 AMID
Silver Dollar Pipeline LLC
 AMID St. Croix LLC
 Argo Merger GP
Sub, LLC
 Centana Gathering, LLC
 Centana Oil Gathering,
LLC
 D-Day Offshore Holdings, LLC

High Point Gas Gathering, L.L.C.
 High Point Gas Gathering
Holdings, LLC
 High Point Gas Transmission, LLC
 High Point Gas
Transmission Holdings, LLC
 PAM Acquisition Company, LLC

Panther Offshore Gathering Systems, LLC
 Panther Operating
Company, LLC
 Panther Pipeline, LLC
 American Panther, LLC

Main Pass Oil Gathering Company, LLC
 American Midstream
Blackwater, LLC
 Blackwater Investments, Inc.
 Blackwater
Maryland, L.L.C.

		
	By:	 	/s/ Eric T. Kalamaras
	Name:	 	Eric T. Kalamaras
	Title:	 	Senior Vice President and Chief Financial Officer

  
 [Signature Page to
Sixth Supplemental Indenture] 

			
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Trustee
		
	By:	 	/s/ Patrick Giordano
	Name:	 	Patrick Giordano
	Title:	 	Vice President

  
 [Signature Page to
Sixth Supplemental Indenture]

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