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  Exhibit 10.16    
    

December 31,
2008                

Paul
Helbling

Senior Vice President, Chief Administration Officer

thinkorswim Group, Inc 

Dear
Paul: 

        This
letter agreement (the "Letter Agreement") confirms and documents your rights in the event of a Change in Control of thinkorswim Group, Inc. (the "Company") on or after the
date hereof. "Change in Control" means a change in the ownership or effective control, or a change in the ownership of a substantial portion of the assets, of the Company, within the meaning of
Section 409A(a)(2)(A)(v) of the Internal Revenue Code of 1986, as amended (the "Code") and U.S. Treasury Regulation Section 1.409A-3(i)(5). 

        This
Letter Agreement terminates and replaces your rights pursuant to, and supersedes any prior, plan, agreement, arrangement or understanding between you and the Company or its
affiliates with respect to the subject matter hereof. In the event the benefits under this Letter Agreement become due and
payable, you shall not have any right to receive severance benefits pursuant to any other plan, agreement, arrangement or understanding with the Company or any of its affiliates. 

        Upon
a Change in Control, you will be entitled to the full vesting of all outstanding options and restricted shares and other equity units granted prior to and through the date upon
which the Change in Control occurs. All other provisions of the plans and agreements governing the awards will remain in force. 

        If
a Change in Control occurs and, within one hundred eighty (180) days following such Change in Control, the Company terminates your employment without Cause (defined below), you
shall be entitled to receive a cash severance benefit in an amount equal to twelve (12) month's base salary (based on your annual salary on the date of the Change in Control), less applicable
taxes, paid in bi-weekly installments in accordance with the Company's normal payroll practices and schedule. In addition, the Company will pay the premiums for you to continue your group
health insurance coverage (as provided to other employees at the time of termination) under COBRA, at active employee contribution rates for the earlier of twelve (12) month's following
termination or until you obtain comparable coverage. 

        For
purposes of this Letter Agreement, "Cause" shall have the meaning set forth in the Company's Amended and Restated 2004 Restricted Stock Plan, as in effect on the date hereof (the
"Plan"), without regard to whether you are a "Participant" in the Plan. 

        The
payments and benefits under this Letter Agreement are intended to comply with Section 409A of the Code ("Section 409A") and the regulations and guidance promulgated
thereunder (except to the extent exempt as short-term deferrals or pursuant to the rules with respect to separation pay plans) and, accordingly, to the maximum extent permitted, the Letter
Agreement shall be interpreted to be in compliance therewith. The Company may reform any provision to the extent necessary to comply with Section 409A. It is intended that each installment, if
any, of the payments and benefits provided shall be treated as a separate "payment" for purposes of Section 409A. If, as of the date of the "separation from service" of you from the Company,
you are a "specified employee" (within the meaning of that term under Section 409A(a)(2)(B) of the Code, or any successor provision thereto), then with regard to any payment or the provision of
any benefit that is subject to this provision (whether under the Letter Agreement, any other plan, program, payroll practice or any equity grant) and is due upon or as a result of your separation from
service, such payment or benefit shall not be made or provided, to the extent making or providing such payment or benefit would result in additional taxes or interest under Section 409A, until
the date which is the earlier of (A) the expiration of the six (6)-month period measured from the date of such "separation from service" of Executive, and (B) the date of Executive's
death (the "Delay Period") and the Letter Agreement and each such plan, program, payroll practice or 

 

equity
grant shall hereby be deemed amended accordingly. Upon the expiration of the Delay Period, all payments and benefits delayed (whether they would have otherwise been payable in a single sum or
in installments in the absence of such delay) shall promptly be paid or reimbursed to you in a lump sum, and any remaining payments and benefits due under the Letter Agreement shall be paid or
provided in accordance with the normal payment dates specified for them herein. 

			
	Sincerely,	 	 
	 	 	 
	/s/ LEE BARBA

  Lee Barba

Chief Executive Officer

thinkorswim Group, Inc.	 	 
	
 	
 	

 
	Accepted and agreed:	 	 
	/s/ PAUL HELBLING

  Paul Helbling (Signature)	 	12/31/08

  (Dated)

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Exhibit 10.16QuickLinks
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  Exhibit 10.17    
    

 
 

  THINKORSWIM GROUP INC.    
    

 
 

  FORM OF RESTRICTED STOCK AWARD AGREEMENT
  UNDER THE AMENDED AND RESTATED 2004 RESTRICTED STOCK PLAN    
    

        thinkorswim Group Inc., a Delaware corporation (the "Company"), hereby awards
and issues to                        (the "Participant"), effective as of XXX, XXX
shares ("Restricted Stock")
of the Company's common stock, par value $0.01 per share (the "Common Stock"), pursuant to and in all respects subject to the terms and conditions of
the Company's Amended and Restated 2004 Restricted Stock Plan, as amended from time to time (the "Plan"), which is incorporated herein in its entirety
by reference. Capitalized terms not otherwise defined in this agreement (this "Agreement") shall have the meaning given to such terms in the Plan. 

        1.     Vesting Schedule.    The shares of the Restricted Stock shall vest as set forth below: 

			
	Vesting Date

 
	 	Cumulative Shares of Restricted Stock

Vested After Such Vesting Date 
	 XXX, 20      
	 	XXX
	 XXX, 20      
	 	XXX

        2.     Transferability.    Shares of Restricted Stock that have not vested may not be sold, assigned, transferred,
pledged, or otherwise disposed of under any circumstances during the applicable Restricted Period (as hereinafter defined) unless otherwise provided by the Plan. The Restricted Stock shall not be
subject to execution, attachment or similar process during the applicable Restricted Period. Upon any attempt to transfer, assign, pledge, or otherwise dispose of the Restricted Stock during the
applicable Restricted Period contrary to the provisions of the Plan or this Agreement, or upon the levy of any attachment or similar process upon the Restricted Stock during the applicable Restricted
Period, the Restricted Stock shall immediately be forfeited to the Company and cease to be outstanding. Subject to Sections 4 and 5 hereof, the period beginning on the date hereof through and
including the vesting date for any particular shares of Restricted Stock shall be referred to herein as the "Restricted Period" with respect to such
shares of Restricted Stock. 

        3.     Stock Certificate.    Upon the grant of Restricted Stock hereunder, one or more stock certificates issued in
respect of such shares of Restricted Stock shall be registered in the name of the Participant and shall be deposited by the Participant with the Company together with a stock power endorsed in blank.
The Company shall provide the Participant with a receipt for such stock certificate acknowledging that the Company is holding such certificate pursuant to the terms of this Agreement. All stock
certificates for shares of Restricted Stock during the Restricted Period shall bear the following legend: 

"THE
TRANSFERABILITY OF THIS CERTIFICATE AND THE SHARES OF STOCK REPRESENTED HEREBY ARE SUBJECT TO THE TERMS AND CONDITIONS (INCLUDING FORFEITURE) CONTAINED IN THE THINKORSWIM GROUP INC.
AMENDED AND RESTATED 2004 RESTRICTED STOCK PLAN AND AN AGREEMENT ENTERED INTO BETWEEN THE REGISTERED OWNER AND THINKORSWIM GROUP INC. A COPY OF SUCH PLAN AND AGREEMENT ARE ON FILE AT THE
PRINCIPAL PLACE OF BUSINESS OF THE COMPANY." 

        With
regard to any shares of Restricted Stock which vest pursuant to Section 1, the Company shall, within 60 days of the date such shares cease to be subject to
restrictions, transfer such shares free of all restrictions set forth in this Agreement to the Participant (or his legal representative, beneficiary or heir); provided,
however, that such shares shall continue to be subject to the restrictions on transfer imposed under applicable requirements of federal and state securities laws and any stock
exchange on which the Common Stock may be listed at the time of such transfer. 

 

        4.     Forfeiture of Restricted Stock.    Any shares of Restricted Stock issued pursuant to this Agreement which have
not vested shall immediately be forfeited to the Company and cease to be outstanding upon the Participant's termination of employment or services with the Company for any reason other than
(i) death, (ii) disability, or with the Committee's discretionary waiver of the vesting requirements, (iii) retirement, or (iv) Change of Control. 

        5.     Acceleration of Vesting. 

        (a)   Death or disability.    If Participant's employment or services with the Company terminate prior to the end of
the Restricted Period by reason of his death or disability, all Restricted Stock shall be vested in full and all limitations on the Restricted Stock set forth in this Agreement and in the Plan shall
automatically lapse. 

        (b)   Retirement or Change of Control.    If Participant's employment or services with the Company terminate prior to
the end of the Restricted Period by reason of his retirement or a Change of Control, all shares of Restricted Stock shall vest in full as of the date of retirement or a Change in Control, and all
limitation on such shares of Restricted Stock set forth in this Agreement and in the Plan shall automatically lapse as of such date. 

        6.     Stockholder's Rights.    Subject to the terms of this Agreement, during the Restricted Period, the Participant
shall have, with respect to any of the shares of Restricted Stock, all rights of a stockholder of the Company, including the right to vote such shares and the right to receive all dividends paid with
respect to such shares of Restricted Stock; provided, that the right to vote and receive dividends shall terminate immediately with respect to any
shares of Restricted Stock upon forfeiture of those shares pursuant to Sections 4 hereof. 

        7.     Withholding Tax.    The Participant hereby agrees that (i) he shall pay to the Company the amount of
taxes which the Company is required to withhold with respect to any benefit under the Plan or this Agreement and (ii) in the event he fails to make such payment, the Company may, in its sole
discretion, withhold from any payment or consideration to be paid to the Participant by the Company any such tax which the Company believes is required to be withheld, or retain or sell without notice
a sufficient number of shares of Restricted Stock awarded hereunder to cover the amount to be withheld. 

        8.     Representations.    The Participant hereby represents and warrants to the Company that all shares of Restricted
Stock acquired upon the grant of Restricted Stock hereunder have been acquired for his own account for investment purposes only and not with a view toward the sale or distribution of any of the shares
of Restricted Stock. The Participant acknowledges that he has been afforded full opportunity to request any and all relevant information and ask questions concerning the purposes and business of the
Company, has been provided all information and copies of all documents he has requested, and has received answers to such questions to his full satisfaction. 

        9.     Term of Employment or Services.    Neither the Plan nor this Agreement shall grant Participant any right to
continue to serve in Participant's current capacity with the Company. 

        10.   Amendment.    This Agreement may not be amended, modified or waived except by a written instrument signed by
the party against whom enforcement of any such modification, amendment or waiver is sought. 

        11.   Governing Law.    This Agreement shall be governed and construed in accordance with the laws of the state of
Delaware. 

        12.   Severability.    If any provision hereof is held invalid or unenforceable by a court of competent jurisdiction,
such invalidity shall not affect the validity or operation of any other provision and such invalid provision shall be deemed to be severed from this Agreement. 

2

 

        13.   Plan Governing.    The Participant hereby acknowledges receipt of a copy of the Plan and accepts and agrees to
be bound by all of the terms and conditions of the Plan as if set out verbatim in this Agreement. In the event of a conflict between the terms of the Plan and the terms of this Agreement, the terms of
the Plan shall control. 

        14.   Integration.    This Agreement, read in conjunction with the Plan, constitutes the entire understanding of the
parties, superceding and replacing all prior agreements and understandings, oral or written, between the Company and the Participant regarding the award and issuance of Restricted Stock covered
hereby. 

        15.   Counterparts.    This Agreement may be executed in two (2) or more counterparts each of which shall be
deemed an original and all of which together shall constitute but one and the same instrument. Facsimile signatures shall have the same effect as original signatures. 

IN
WITNESS WHEREOF, the Participant has hereunto set his hand and the Company has caused this Agreement to be executed in its name and on its behalf, effective as of the date first written above. 

					
	 
	 	THINKORSWIM GROUP INC.
	     
	 	 	 	 
	 
	 	By:	 	  

  [Officer]
	     
	 	 	 	 
	 
	 	PARTICIPANT
	     
	 	 	 	 
	 
	 	By:	 	 

 
	 
	 	Name:	 	  

 
	 
	 	Date:	 	  

 

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Exhibit 10.17

THINKORSWIM GROUP INC.

FORM OF RESTRICTED STOCK AWARD AGREEMENT UNDER THE AMENDED AND RESTATED 2004 RESTRICTED STOCK PLAN

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