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Exhibit 10.19    
    

 
  PROMISSORY NOTE    
    

	$150,000	 	As of June 21, 2005
	 	 	Menlo Park, CA

        MDC ACQUISITION PARTNERS INC. (the "Maker") promises to pay
to the order of McCown De Leeuw & Co., LLC (the "Payee") the principal sum of One Hundred Fifty
Thousand Dollars ($150,000) in lawful money of the United States of America together with interest on the unpaid principal balance of this Promissory Note (this
"Note"), on the terms and conditions described below. 

        1.     Principal.    The principal balance of this Note shall be repayable on the earlier of (i) June 22,
2005 or (ii) the date on which Maker consummates an initial public offering of its securities under the Securities Act of 1933, as amended. 

        2.     Interest.    Interest shall accrue at the rate of 3.5% per year on the unpaid principal balance of this Note. 

        3.     Application of Payments.    All payments shall be applied first to payment in full of any costs incurred in the
collection of any sum due under this Note, including (without limitation) reasonable attorneys' fees, then to the reduction of the unpaid principal and interest balance of this Note. 

        4.     Events of Default.    Each of the following shall constitute an event of default ("Event
of Default") under this Note: 

        (a)   Failure to Make Required Payments.    Failure by Maker to pay the principal and accrued interest of this Note
within five (5) business days following the date when due. 

        (b)   Voluntary Bankruptcy, Etc.    The commencement by Maker of a voluntary case under the Federal Bankruptcy Code,
as now constituted or hereafter amended, or any other applicable federal or state bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment
of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of
any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker in furtherance of any of the
foregoing. 

        (c)   Involuntary Bankruptcy, Etc.    The entry of a decree or order for relief by a court having jurisdiction in the
premises in respect of maker in an involuntary case under the Federal Bankruptcy Code, as now or hereafter constituted, or any other applicable federal or state bankruptcy, insolvency or other similar
law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up
or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of sixty (60) consecutive days. 

        5.     Remedies.  

         (a)   Upon the occurrence of an Event of Default specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this
Note to
be immediately due and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and payable. 

        (b)   Upon the occurrence of an Event of Default specified in either Section 4(b) or Section 4(c) hereof, the
unpaid principal balance of this Note, and all other amounts payable hereunder, shall automatically and immediately become due and payable, in all cases without any 

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action
on the part of Payee, including presentment, demand, protest or other notice of any kind, all of which are hereby expressly waived. 

        6.     Waivers.    Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for
payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note,
and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property,
from attachment, levy or sale under execution, or providing for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be
levied upon pursuant to a judgment obtained by virtue hereof, on any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order desired by Payee. 

        7.     Unconditional Liability.    Maker hereby waives all notices in connection with the delivery, acceptance,
performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in
any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications
that may be granted by Payee with respect to the payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without
notice to it or affecting its liability hereunder. 

        8.     Notices.    Any notice called for hereunder shall be deemed properly given if in writing and (i) sent by
certified mail, return receipt requested, (ii) personally delivered, (iii) dispatched by any form of private or governmental express mail or delivery service providing receipted
delivery, (iv) sent by confirmed telefacsimile or (v) sent by confirmed e-mail, to the following addresses or to such other address as either party may designate by notice in
accordance with this Section: 

        If to Maker:

MDC
ACQUISITION PARTNERS INC.

525 Middlefield Rd., Suite 210

Menlo Park, CA 94025

Attn.: Robert B. Hellman, Jr. 

        If to Payee:

MCCOWN
DE LEEUW & CO., LLC

525 Middlefield Rd., Suite 210

Menlo Park, CA 94025 

Notice
shall be deemed given on the earlier of (i) actual receipt by the receiving party, (ii) the date shown on the confirmed telefacsimile transmission confirmation, (iii) the
date on which an e-mail transmission was received by the receiving party's on-line access provider (iv) the date reflected on a signed delivery receipt, or
(vi) two (2) Business Days following tender of delivery or dispatch by express mail or delivery service. 

        9.     Governing Law; Construction.    This Note, the legal relations between the Maker and Payee and the adjudication
and the enforcement hereof shall be governed by and construed in accordance with the laws of the State of California applicable to contracts executed in and to be performed in that state, without
regard to the conflicts of law provisions thereof to the extent such principles or rules would require or permit the application of the laws of another jurisdiction. 

        10.   Severability.    Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction
shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or 

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unenforceability
in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction. 

        IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly executed the day and year first above
written. 

	 	 	MDC ACQUISITION PARTNERS INC.
	

 	
 	

By:	

/s/  MATTHEW P. CARBONE      

	 	 	Name:	Matthew P. Carbone
	 	 	Title:	President

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Exhibit 10.19

PROMISSORY NOTEQuickLinks
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Exhibit 10.23    
    

[COMPANY LETTERHEAD]  

                                ,
2005 

	 
	 	 

	
	 	 
	
	 	 
	
	 	 

Dear
                        : 

        We
are pleased to inform you that the Board of Directors has selected you for participation in a special bonus program established by the Company (the
"Program"). The purpose of the Program is to allow you and other individuals important to the success of the Company to derive a future benefit from
future Common Stock repurchases by the Company from certain Company stockholders through the creation of a Stock Unit Pool. 

        The
purpose of this letter is to notify you of your opportunity to participate in the Program and the terms and conditions that will govern such participation. Section 1 of this
letter contains certain definitions that will be in effect for purposes of the Program. Section 2 specifies the terms of your participation in the Program and the provisions governing the
settlement of Stock Units that are awarded to you. Section 3 contains certain miscellaneous provisions of the Program. 

1.     DEFINITIONS.  

        For purposes of the Program, the following definitions will apply: 

        1.1   Board means the Company's Board of Directors. 

        1.2   Business Combination means an acquisition by the Company of, through merger, capital stock exchange, asset acquisition or
other similar business combination, one or more operating businesses. 

        1.3   Code means the Internal Revenue Code of 1986, as amended. 

        1.4   Common Stock means the common stock of the Company. 

        1.5   Company means MDC Acquisition Partners Inc., a Delaware corporation. 

        1.6   Continuous Service means that your service with the Company (or a parent or subsidiary of the Company), whether as an
employee, member of the Board, or member of the management council is not interrupted or terminated. A change in the capacity in which you render service to the Company (or a parent or subsidiary of
the Company) as an employee, member of the Board or member of the management council or a change in the entity for which you render service as an employee, provided that there is no interruption or
termination of your service with the Company (or a parent or subsidiary of the Company), shall not terminate your Continuous Service. 

        1.7   Effective Date means                         , 2005. 

        1.8   Program Administrator means the Compensation Committee or other committee appointed by the Board to administer the
Program. 

        1.9   Program Participants means you and the other persons participating in the Program from time to time. 

        1.10 Repurchased Stock means Common Stock repurchased by the Company pursuant to the terms of those certain Founder's Stock
Purchase Agreements entered by the Company with its stockholders prior to the consummation of the IPO. 

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        1.11 Stock Units means the participating interests in the Stock Unit Pool awarded from time to time to you and other Program
Participants. 

        1.12 Stock Unit Pool means a pool reserved for distribution to the Program Participants consisting of the aggregate number of
shares of Repurchased Stock held by the Company plus the proceeds (net of commissions, discounts, fees and expenses) from any sale by the Company of shares of Repurchased Stock. 

        1.13 Stock Unit Pool Ratio means, for each Program Participant, the ratio equal to such person's vested Stock Units divided
by the aggregate number of outstanding Stock Units. 

2.     BONUS AWARD  

        2.1   Number of Stock Units. Based on your Common Stock ownership of the Company as of the Effective
Date, you have been awarded                          Stock Units. 

        Your
awarded Stock Units will allow you to participate in the Stock Unit Pool established pursuant to the terms of the Program as provided below but will  not entitle you to any rights as a stockholder
of the Company, including any voting, dividend or liquidation rights. 

        The
terms and conditions which govern the vesting and settlement of your Stock Units are as follows: 

        (a)   Vesting in Stock Units. You will have a vested nonforfeitable right to your awarded Stock Units, assuming continuation of
your Continuous Service, upon the consummation of a Business Combination. If your Continuous Service ceases for any reason (including death or disability), or for no reason, with or without cause,
before your awarded Stock Units have vested as set forth above, then all of your Stock Units shall be immediately cancelled and shall cease to be outstanding for all purposes under the Program. 

        (b)   Settlement of Stock Units. Upon the third anniversary of the Effective Date, the Company shall distribute to each Program
Participant then holding vested Stock Units (i) the number of shares of Common Stock equal to such person's Stock Unit Ratio multiplied by the total number of shares of Repurchased Stock then
held by the Company in the Stock Unit Pool, plus (ii) such person's Stock Unit Ratio multiplied by the proceeds (net of commissions, discounts, fees and expenses) from any sale by the Company
of shares of Repurchased Stock then held in the Stock Unit Pool. 

        2.2   Special Limitation. In the event that any payments to which you become entitled in accordance
with the provisions of the Program or otherwise would constitute a parachute payment under Section 280G of the Code and applicable Treasury Regulations, then such payments under the Program
will be subject to reduction to the extent necessary to assure that you receive only the greater of (i) the amount of those payments that would
not constitute such a parachute payment or (ii) the amount that yields you the greatest after-tax amount of benefits after taking into account any excise tax imposed on the payments
provided to you under the Program or any other payments under Section 4999 of the Code. 

3.     MISCELLANEOUS PROVISIONS  

        The issuance of Stock Units under the Program shall in no way affect the right of the Company to adjust, reclassify, reorganize or otherwise change its capital or
business structure or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets. 

        Subject
to the restriction imposed on the transfer of the Repurchased Stock by the letter agreements between the Program Participants and the lead underwriter for the Company's initial
public offering, the Company shall have the right to sell or otherwise distribute any or all shares of 

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Repurchased
Stock at its sole discretion, provided that the proceeds (net of commissions, discounts, fees and expenses) from any such sale shall constitute a portion of the Stock Unit Pool. 

        To
the extent payments or distributions under the Program are subject to tax withholding by the Company, the Company shall withhold from all payments or distributions under the Program
all applicable federal, state and local income and employment taxes, including excise taxes imposed under Section 4999 of the Code. To the extent distributions of Repurchased Stock under the
Program to a Program Participant are not subject to tax withholding by the Company, the Company shall, at the request of such Program Participant, withhold from such distributions such number of
Repurchased Stock having a fair market value equal to such Program Participant's expected tax on such distribution and in lieu thereof distribute to such Program Participant cash. 

        Your
Stock Units or any rights or interests pertaining thereto may not be transferred, assigned, pledged or encumbered, other than a transfer effected by will or the laws of inheritance
following your death. 

        The
Board may amend the Program at any time prior to a Business Combination. This Program shall terminate upon the dissolution of the Company. 

        The
Program Administrator will have full power and authority to administer the Program and to interpret any terms and provisions of this letter that may become the subject of dispute.
Decisions of the Program Administrator will be binding upon you and all other Program Participants. 

        No
provision of the Program or your outstanding Stock Units, whether or not vested, will confer any right upon you to continue in Continuous Service for any period of specific duration
or interfere with or otherwise restrict in any way the rights of the Company or your rights to terminate your Continuous Service at any time for any reason, with or without cause. 

        The
provisions of the Program and this letter will be governed by and construed in accordance with the laws of the State of California, without resort to that state's conflict of laws
rules. 

        The
liabilities and obligations of the Company under the Program and this letter will be binding upon any successor corporation or entity that succeeds to all or substantially all of the
assets and business of the Company by merger or other transaction, whether or not such transaction qualifies as a Business Combination. 

We
ask that you acknowledge your receipt of this letter and your acceptance of the terms and conditions in effect for the Stock Units that have been awarded to you under the Program by signing and
dating the Acceptance section below and returning it to the Company as soon as possible. 

	 
	 	 
	 	 

	 	 	Very truly yours,
	

 	
 	

 	
 	

 
	

 	
 	

Name:	
 	

	

 	
 	

Title:	
 	

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ACCEPTANCE  

        I hereby acknowledge receipt of the Company's letter of August    , 2005 setting forth the terms and conditions governing the Stock Units awarded to me
under the Company's special bonus program (the "Program"). I hereby agree to and accept all of the terms and conditions of the Program, and my
entitlement to any bonus payments by reason of those Stock Units shall be determined solely by such terms and conditions. 

	 
	 	 
	 	 

	 	 	Signature:	 	

	

 	
 	

Printed Name:	
 	

	

 	
 	

Dated:	
 	

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Exhibit 10.23

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