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Exhibit 10.28  

 
  FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT
  AND RATIFICATION OF LOAN DOCUMENTS    
    

        THIS FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT AND RATIFICATION OF LOAN DOCUMENTS dated as of
August 31, 2007 (this "First Amendment") is entered into by and between CITIZENS BANK OF
MASSACHUSETTS (together with its successors and assigns the "Bank"), a Massachusetts bank with a principal place of business at
28 State Street, Boston, Massachusetts 02109, and HITTITE MICROWAVE CORPORATION (the "Borrower"), a
Delaware corporation with a principal place of business at 20 Alpha Road, Chelmsford, Massachusetts 01824. 

        WHEREAS, the Bank and the Borrower entered into an Equipment and Commercial Revolving Line of Credit Agreement dated as of
September 30, 2001 (as amended by various amendments, including the First Amendment to Equipment and Commercial Revolving Credit Agreement and Ratification of Loan Documents dated as of
June 25, 2003 and the Second Amendment to Equipment and Commercial Revolving Credit Agreement and Ratification of Loan Documents dated as of July 7, 2004, collectively the  "Original Credit Agreement") pursuant to which the Bank extended to the Borrower (i) a revolving line of credit facility in the original
principal amount of Four Million Dollars ($4,000,000.00) (the "Revolving Credit") and (ii) an equipment line of credit in the original principal
amount of Four Million Dollars ($4,000,000.00) (the "Equipment Credit"); and 

        WHEREAS, the Bank and the Borrower entered into an Amended and Restated Credit Agreement dated as of July 31, 2006 (as the same may
be amended, modified, extended or replaced from time to time, including by this First Amendment, the "Amended and Restated Credit Agreement"), pursuant
to which, among other things, the parties agreed to (i) eliminate the Equipment Credit, (ii) increase the amount available under the Revolving Credit to Thirty Million Dollars
($30,000,000.00) evidenced by a revolving credit note in the original principal amount of $30,000,000.00 dated July 31, 2006 (the "Original Revolving
Note"), and (iii) amend and restate the Original Credit Agreement; and 

        WHEREAS, subject to the terms of this First Amendment, the Borrower and the Bank have agreed to extend the Maturity Date of the Revolving
Credit from July 31, 2007 to August 30, 2008; 

        NOW, THEREFORE, for good and valuable consideration, the receipt of which are hereby acknowledged, the parties hereby agree as follows: 

        1.     The
Amended and Restated Credit Agreement is hereby amended as follows: 

	(a)
	The
definition of "Maturity Date" at the bottom of page 2 is hereby amended by deleting the date "July 31, 2007" and substituting the date "August 30, 2008" in
lieu thereof, thereby extending the Maturity Date of the Revolving Credit to August 30, 2008. 

        2.     Simultaneously
herewith and as a condition of the effectiveness of this First Amendment, the Borrower shall execute and deliver, in addition to this First Amendment, the
following to the Bank: 

	(a)
	An
Allonge to and Amendment of Revolving Credit Note;

	(b)
	A
Secretary Certificate attesting to the incumbency and authority of the persons executing this First Amendment and all other related documents; and

	(c)
	Such
other documents and certificates as the Bank or its counsel may reasonably require, with all documents to be in form and substance satisfactory to the Bank and its counsel. 

        3.     The
Borrower hereby represents and warrants that, to the best of its knowledge: (a) the representations and warranties contained in Section 4 of the Amended
and Restated Credit Agreement remain true and accurate in all material respects; (b) there has not occurred any material adverse change in the business, assets, financial condition or prospects
of the business of the Borrower since 

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the
date of the last financial statements submitted to the Bank by the Borrower; and (c) the Borrower has no offsets, set-offs or other claims of any kind against the Bank as of the
date hereof, and, to the extent the Borrower has any such offsets, set-offs, claims, the Borrower hereby waives the same. 

        4.     The
Borrower agrees to execute, acknowledge and deliver such further instruments as the Bank shall reasonably require in order to effectuate the intent of this First
Amendment. 

        5.     The
Borrower will pay or reimburse the Bank, on demand, for all reasonable expenses (including, without limitation, reasonable counsel fees and expenses) incurred or paid
by the Bank in connection with the making of the Loans, including this First Amendment, and the enforcement by the Bank of its rights as against the Borrower or any other person primarily or
secondarily liable to the Bank hereunder or thereunder; the administration, supervision, protection or realization on any collateral held by the Bank as security for any obligation of the Borrower or
any other person primarily or secondarily liable with respect thereto. In addition, the Borrower shall pay any and all stamp and other taxes and fees payable or determined to by payable in connection
with the execution, delivery, filing and recording of any of the Loan Documents and the other documents to be delivered under any such Loan Documents, and agree to save the Bank harmless from and
against any and all liabilities with respect to or resulting from any delay in paying or omission to pay such taxes and fees. 

        6.     This
First Amendment may be executed in any number of counterparts, and when each party has signed and delivered at least one such counterpart, each counterpart shall be
considered an original, and when taken together with other signed counterparts, shall constitute one agreement, which shall be binding upon and effective as to all parties. Time of all payments and
provisions hereof is of strict essence. The provisions of this First Amendment are hereby declared to be severable, and the invalidity of any provision or application thereof shall not affect any
other provision or any other application thereof. This First Amendment is binding upon and shall inure to the benefit of the parties hereto, their heirs, executors, administrators, successors and
assigns. This First Amendment shall be deemed to have been executed and delivered within The Commonwealth of Massachusetts, and the rights and obligations of the parties hereto shall be construed and
enforced in accordance with, and governed by, the laws of The Commonwealth of Massachusetts. Each party has cooperated in the drafting and preparation of this Agreement; hence, in any construction to
be made of this First Amendment, the same shall not be construed against any party. Facsimile and scanned signatures shall be deemed originals for all purposes. 

        7.     All
capitalized terms not otherwise defined herein shall have the meanings ascribed to them in the Amended and Restated Credit Agreement, as amended hereby. All
references to the loan documents or "Loan Documents" shall hereinafter be deemed to include this First Amendment. 

        8.     Except
as set forth herein, the Borrower hereby acknowledges and agrees that this First Amendment and the Amended and Restated Credit Agreement, and all loan documents
now or heretofore executed and delivered by the Borrower to the Bank, securing the Obligations, as defined in the Amended and Restated Credit Agreement, remain in full force and effect and hereby
ratify and confirm that all Obligations of the Borrower to the Bank, whether now existing or hereafter arising, remain in full force and effect. 

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        IN WITNESS WHEREOF, the parties have executed, or caused this First Amendment to be executed, by their respective officers thereunto duly
authorized, as of the day first written above and it and shall take effect as a sealed instrument. 

	 	 	HITITTE MICROWAVE CORPORATION
	
/s/  NORMAN G. HILDRETH, JR.      
	
 	

By:	

/s/  WILLIAM W. BOECKE      

	Witness	 	Name:	WILLIAM W. BOECKE
	 	 	Title:	V.P. CHIEF FINANCIAL OFFICER
	

 	
 	
CITIZENS BANK OF MASSACHUSETTS
 
	

 	
 	

By:	

/s/  CHRISTOPHER J. WICKLES      

	 	 	Christopher J. Wickles, Vice President

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  ALLONGE TO AND AMENDMENT OF REVOLVING CREDIT NOTE  

        Reference is hereby made to a certain Revolving Credit Note dated July 31, 2006 in the original principal amount of Thirty Million Dollars ($30,000,000.00)
(the "Original Revolving Note") executed and delivered by HITTITE MICROWAVE CORPORATION (the  "Borrower"), a
Delaware corporation, payable to the order of CITIZENS BANK OF MASSACHUSETTS (the
"Bank"). 

        WHEREAS, the Bank and the Borrower entered into an Amended and Restated Credit Agreement dated as of July 31, 2006 (together will
all modifications and amendments the "Amended and Restated Credit Agreement") pursuant to which the Bank extended a Revolving Credit to the Borrower in
the original principal amount of $30,000,000.00 and the Borrower executed and delivered the Original Revolving Note; and 

        WHEREAS, the Borrower has requested that the Maturity Date of the Revolving Credit be extended from July 31, 2007 to
August 30, 2008 and the Bank has agreed, subject to the execution and/or delivery of, among other things, the First Amendment to Amended and Restated Credit Agreement and Ratification of Loan
Documents and this Allonge; 

        NOW, THEREFORE, the parties agree as follows: 

        1.     The
Original Revolving Note is hereby amended by deleting the date "July 31, 2007" from the first paragraph thereof and substituting the date "August 30,
2008" in lieu thereof, thereby extending the Maturity Date to August 30, 2008. 

        2.     In
all other respects, the Original Revolving Note is ratified and confirmed as being in full force and effect and as being secured by the same collateral, which secured
the Original Revolving Note. 

[This
Page Ends Here—Signature Page to Follow] 

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Signed
as a sealed instrument as of August 31, 2007. 

	 	 	HITTITE MICROWAVE CORPORATION
	
/s/  NORMAN G. HILDRETH, JR.      
	
 	

By:	

/s/  WILLIAM W. BOECKE      

	Witness	 	Name:	WILLIAM W. BOECKE
	 	 	Title:	V.P. CHIEF FINANCIAL OFFICER
	

 	
 	
CITIZENS BANK OF MASSACHUSETTS
 
	

 	
 	

By:	

/s/  CHRISTOPHER J. WICKLES      

	 	 	Christopher J. Wickles, Vice President

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Exhibit 10.30    
    

Second Amendment to the Second Amended and Restated Limited Liability Company Agreement of HELIO LLC  

This
Second Amendment to the Second Amended and Restated Limited Liability Company Agreement of Helio LLC is entered into on this 28th day of February 2008 (this
"Second Amendment") by and between SK Telecom USA Holdings, Inc., a Delaware corporation, EarthLink, Inc., a Delaware corporation,
Helio, Inc., a Delaware corporation, and HELIO LLC, a Delaware limited liability company (the "Operating Company"). All capitalized terms
used in this Second Amendment and not otherwise defined herein shall have the meanings ascribed to them in the Agreement, as defined below. 

 
 

RECITALS    
    

        WHEREAS, the parties hereto entered into the Second Amended and Restated Limited Liability Company Agreement of Helio LLC, dated November 12, 2007,
and subsequently entered into an Amendment to the Second Amended and Restated Limited Liability Company Agreement of HELIO LLC, dated November 16, 2007 (hereinafter referred to
collectively as the "Agreement"); and 

        WHEREAS,
the parties hereto mutually desire to clarify and adjust the impact of certain events on the rights and obligations of the Members of the Operating Company as described in the
Agreement. 

        NOW,
THEREFORE, in consideration of the mutual covenants herein contained, and for other good and valuable consideration, the parties hereto agree and amend the Agreement as follows: 

ARTICLE 1

DEFINITIONS  

        1.1    Amended Definitions.    For purposes of this Second Amendment
and the Agreement, as amended, the following terms shall have the meanings set forth beside them in this Section 1.2 in lieu of the meanings set forth beside such terms in the Agreement: 

        "Agreement" shall have the meaning set forth in the Recitals to the Second Amendment, as amended by the Second Amendment and such other
amendments thereafter entered into from time to time. 

        "Change of Control" shall mean (i) a Management Company Change in Control or (ii) an Operating Company Change in Control. 

        "Control" (and "Controlling" and  "Controlled"), as used with respect to any Entity, shall mean possession, directly or
indirectly, of the power to direct or cause the direction of
management policies of such Entity through the ownership of voting securities or by contract. 

        "Person" means any human being, firm, corporation, partnership, or other entity. "Person" also includes any human being, firm,
corporation, partnership, or other entity as defined in sections 13(d)(3) and 14(d)(2) of the Exchange Act. For purpose of the definition of Change of Control and the defined terms referenced
therein, the term "Person" does not include the Management Company, the Operating Company or any of their Affiliates, and the term Person does not include any employee-benefit plan maintained by the
Management Company, the Operating Company or any of their Affiliates, or any person or entity organized, appointed, or established by the Management Company, the Operating Company or any of their
Affiliates for or pursuant to the terms of any such employee-benefit plan, unless the Board determines that such an employee-benefit plan or such person or entity is a "Person". 

 

        1.2    Additional Definitions.    For purposes of this Second
Amendment and the Agreement, as amended, the following terms shall have the meanings set forth beside them in this Section 1.1: 

        "Change of Control Date" means the date on which a Change of Control occurs. If any such Change of Control occurs on account of a series
of transactions, the "Change of Control Date" is the date of the last of such transactions. 

        "Continuing Director" means any member of the Board whose nomination for or election to the Board was recommended or approved by the
Initial Members or a majority of the Continuing Directors. 

        "Management Company Acquiring Person" means that a Person, considered alone or as part of a "group" within the meaning of
Section 13(d)(3) of the Exchange Act, as amended, other than an Initial Member (as identified in the definition of Member) or any Affiliate, is or becomes directly or indirectly the beneficial
owner (as defined in Rule 13d-3 under the Exchange Act) of securities representing more than fifty percent (50%) of the Management Company's then outstanding securities entitled to
vote generally in the election of the Board. 

        "Management Company Change in Control" means (i) a Person, other than an Initial Member, is or becomes a Management Company
Acquiring Person; (ii) holders of the securities of the Management Company entitled to vote thereon approve any agreement with a Person, other than an Initial Member or any Affiliate, (or, if
such approval is not required by applicable law and is not solicited by the Management Company, the closing of such an agreement) that involves the transfer of all or substantially all of the
Management Company's assets on a consolidated basis; (iii) holders of the securities of the Management Company entitled to vote thereon approve a transaction (or, if such approval is not
required by applicable law and is not solicited by the Management Company, the closing of such a transaction) pursuant to which the Management Company will undergo a merger, consolidation, statutory
share exchange or similar event with a Person, other than an Initial Member of any Affiliate, regardless of whether the Management Company is intended to be the surviving or resulting entity after the
merger, consolidation, statutory share exchange or similar event, other than a transaction that results in the voting securities of the Management Company carrying the right to vote in elections of
persons to the Board outstanding immediately prior to the closing of the transaction continuing to represent (either by remaining outstanding or by being converted into voting securities of the
surviving entity) more than 50% (fifty percent) of the Management Company's voting securities carrying the right to vote in elections of persons to the Management Company's Board, or voting securities
of such surviving entity carrying the right to vote in elections of persons to the Board of Directors or similar authority of such surviving entity, outstanding immediately after the closing of such
transaction; (iv) the Continuing Directors cease for any reason to constitute at least half of the number of members of the Board; (v) holders of the securities of the Management Company
entitled to vote thereon approve a plan of complete liquidation of the Management Company or an agreement for the liquidation by the Management Company of all or substantially all of the Management
Company's assets (or, if such approval is not required by applicable law and is not solicited by the Management Company, the commencement of actions constituting such a plan or the closing of such an
agreement); or (vi) the Board adopts a resolution to the effect that, in its judgment, as a consequence of any one or more transactions or events or series of transactions or events, a change
in control of the Management Company has effectively occurred. Notwithstanding the foregoing, no event resulting from an initial public offering of securities of the Management Company shall
constitute a Management Company
Change in Control. The Board shall be entitled to exercise its sole and absolute discretion in exercising its judgment and in the adoption of such resolution, whether or not any such transaction(s) or
event(s) might be deemed, individually or collectively, to satisfy any of the criteria set forth in subparagraphs (i) through (v) above. 

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        "Operating Company Acquiring Person" means that a Person, considered alone or as part of a "group" within the meaning of
Section 13(d)(3) of the Exchange Act, as amended, other than an Initial Member or any Affiliate, is or becomes directly or indirectly the beneficial owner (as defined in
Rule 13d-3 under the Exchange Act) of securities representing more than fifty percent (50%) of the Operating Company's then outstanding Membership Units. 

        "Operating Company Change in Control" means (i) a Person, other than an Initial Member, is or becomes an Operating Company
Acquiring Person; (ii) holders of the Membership Units of the Operating Company entitled to vote thereon approve any agreement with a Person, other than an Initial Member or any Affiliate (or,
if such approval is not required by applicable law and is not solicited by the Operating Company, the closing of such an agreement) that involves the transfer of all or substantially all of the
Operating Company's assets on a consolidated basis; (iii) holders of the Membership Units of the Operating Company entitled to vote thereon approve a transaction (or, if such approval is not
required by applicable law and is not solicited by the Operating Company, the closing of such a transaction) pursuant to which the Operating Company will undergo a merger, consolidation, statutory
share exchange or similar event with a Person, other than an Initial Member or any Affiliate, regardless of whether the Operating Company is intended to be the surviving or resulting entity after the
merger, consolidation, statutory share exchange or similar event, other than a transaction that results in the Membership Units of the Operating Company outstanding immediately prior to the closing of
the transaction continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity) more than 50% (fifty percent) of the Operating Company's
Membership Units, or voting securities of such surviving entity carrying the right to vote in elections of persons to the Board of Directors or similar authority of such surviving entity, outstanding
immediately after the closing of such transaction; (iv) holders of the Membership Units of the Operating Company approve a plan of complete liquidation of the Operating Company or an agreement
for the liquidation by the Operating Company of all or substantially all of the Operating Company's assets (or, if such approval is not required by applicable law and is not solicited by the Operating
Company, the commencement of actions constituting such a plan or the closing of such an agreement). Notwithstanding the foregoing, no event resulting from an initial public offering of securities of
the Company shall constitute an Operating Company Change in Control. The Board shall be entitled to exercise its sole and absolute discretion in exercising its judgment and in the adoption of such
resolution, whether or not any such transaction(s) or event(s) might be deemed, individually or collectively, to satisfy any of the criteria set forth in subparagraphs (i) through
(iv) above. 

        "Special Management Services Agreement" shall have the meaning set forth in Section 4.7. 

        "Type C Triggering Event Fee" shall have the meaning set forth in Section 4.7. 

        "Type C Triggering Event" shall mean (i) a Change of Control, or (ii) an event causing dissolution under
Section 13.2. 

ARTICLE 2

EFFECT OF TRIGGERING EVENTS  

        2.1    Sale of Operating Company.    Section 4.7 of the
Agreement is hereby deleted in its entirety and replaced with the following: 

        4.7    Effect of a Type C Triggering
Event.    Upon the occurrence of a Type C Triggering Event, the Members shall negotiate in good faith and enter into a contract between
the Operating Company and the Management Company (the "Special Management Services Agreement"), pursuant to which the Management Company shall provide
the additional and special management required by such Type C Triggering Event in return for a one-time fee (the "Type C Triggering Event
Fee"). The Type C Triggering Event Fee shall be determined: (i) if in relation to a Change 

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of
Control resulting in proceeds to the Operating Company and/or Management Company, based on factors, including, but not limited to, the structure of such transaction, the amount of proceeds
generated thereby, and the Total Outstanding Shares at the time of the Type C Triggering Event, and (ii) if otherwise in relation to liquidation and dissolution of the Operating Company
and/or Management Company, based on factors, including, but not limited to, the likely liquidation value realizable from the assets of the entity or entities, the anticipated time to completion of the
liquidation and dissolution process, and the Total Outstanding Shares at the time of the Type C Triggering Event. The Type C Triggering Event Fee shall be a current obligation of the
Operating Company payable prior to any distributions made pursuant to Article 11; if the Type C Triggering Event results in receipt of
proceeds by the Operating Company or the Management Company, whether cash, securities or other property, and such proceeds are received prior to the execution of the Special Management Services
Agreement, the proceeds shall be placed in escrow until such time as the parties consummate the Special Management Services Agreement. If the parties fail to enter a Special Management Services
Agreement within thirty (30) days from the Type C Triggering Event and the Management Company has negotiated in good faith with the Operating Company for the full thirty (30)day period,
then, notwithstanding Article 11, including Sections 11.1 and  11.2, if and as applicable, each
Member shall receive the same distribution(s) in relation to such Type C Triggering Event as such Member would
have been entitled to receive if that Member's Membership Units had been automatically exchanged upon such Type C Triggering Event to Class A Common Stock, consistent with the procedures
set forth in Section 15.1. 

        2.2    Distributions.    The introduction to
Section 11.1 is hereby deleted in its entirety and replaced as follows: 

        11.1    Distributions.    Except as otherwise
provided in Sections 4.7, 11.2, 11.4, 11.5 and 11.6 below, all distributions to Members with
respect to each Fiscal Year shall be made, at such time and in such amounts, if any, as the Management Company shall determine, as follows: 

        2.3    Winding Up.    Section 13.4 of the Agreement is hereby
deleted in its entirety and replaced with the following: 

        13.4    Winding Up.    In the event of the
dissolution of the Operating Company for any reason, the Management Company shall proceed promptly to wind up the affairs and liquidate the assets of the Operating Company. Subject to  Section 4.7
and except as otherwise provided in this Agreement, the Members shall continue to share distributions and allocations during the
period of liquidation in the same manner as before dissolution. The Management Company shall have complete discretion to determine the time, manner and terms of any sale of the Operating Company
property pursuant to such liquidation. 

ARTICLE 3

AFFIRMATION OF TERMS  

        3.1    Effectiveness.    This Second Amendment shall be valid and
effective on and from February 28, 2008. All of the other terms and conditions of the Agreement, unless otherwise expressly amended herein, shall remain in full force and effect. 

SIGNATURE PAGE FOLLOWS  

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IN WITNESS WHEREOF, the parties hereto have caused this Second Amendment to be executed by their duly authorized representatives as of the date first written in this Second
Amendment. 

	 	EARTHLINK, INC.
	

 	

 
	 	
 Name:

Title:
	

 	
SK TELECOM USA HOLDINGS, INC.
	

 	

 
	 	
 Name:

Title:
	

 	
HELIO, INC.
	

 	

 
	 	
 Name:

Title:
	

 	
HELIO LLC
	

 	

By: Helio, Inc.

Its: Manager
	

 	

 
	 	
 Name:

Title:

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Exhibit 10.30

RECITALS

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