Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Cahill William P
 2. Date of Event Requiring Statement (Month/Day/Year)
01/01/2009		 3. Issuer Name and Ticker or Trading Symbol
TRADESTATION GROUP INC [TRAD]
(Last)
(First)
(Middle)
8050 SW 10TH STREET, SUITE 2000		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Pres & COO of TS Securities
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

PLANTATION, FL 33324		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to buy) 04/22/2005(1) 04/21/2014 Common Stock 10,000 $ 7.27 D  
Stock Option (Right to buy) 01/03/2006(2) 01/02/2015 Common Stock 5,000 $ 7.11 D  
Stock Option (Right to buy) 01/26/2007(3) 01/25/2016 Common Stock 2,000 $ 16.58 D  
Stock Option (Right to buy) 01/19/2008(4) 01/18/2017 Common Stock 3,000 $ 12.43 D  
Stock Option (Right to buy) 01/18/2009(5) 01/17/2018 Common Stock 3,000 $ 11.42 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Cahill William P
8050 SW 10TH STREET
SUITE 2000
PLANTATION, FL 33324		       Pres & COO of TS Securities  

Signatures

/s/ William P. Cahill 01/02/2009
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Stock options to purchase 6,000 shares of common stock became exercisable as follows: 2,000 each on April 22, 2005, 2006 and 2007. The remaining stock options to purchase 4,000 shares of common stock become exercisable as follows: 2,000 each on April 22, 2008 and 2009.
(2) Stock options to purchase 3,000 shares of common stock became exercisable as follows: 1,000 each on January 3, 2006, 2007 and 2008. The remaining stock options to purchase 2,000 shares of common stock become exercisable as follows: 1,000 each on January 3, 2009 and 2010.
(3) Stock options to purchase 800 shares of common stock became exercisable as follows: 400 each on January 26, 2007 and January 26, 2008. The remaining stock options to purchase 1,200 shares of common stock become exercisable as follows: 400 each on January 26, 2009, 2010 and 2011.
(4) Stock options to purchase 600 shares of common stock became exercisable on January 19, 2008. The remaining stock options to purchase 2,400 shares of common stock become exercisable as follows: 600 each on January 19, 2009, 2010, 2011 and 2012.
(5) Stock options to purchase 3,000 shares of common stock become exercisable as follows: 600 each on January 18, 2009, 2010, 2011, 2012 and 2013.

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