Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *
GETCO Holding Company, LLC
   2. Issuer Name and Ticker or Trading Symbol
KNIGHT CAPITAL GROUP, INC. [KCG] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
350 N. ORLEANS STREET		 3. Date of Earliest Transaction (Month/Day/Year)
08/16/2012
(Street)

CHICAGO, IL 60654		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Series A-2 Convertible Preferred Stock (1) 08/16/2012   S     2,187   (1)   (1) Series A-1 Convertible Preferred Stock 2,187 $ 1,500 67,900 (2) I Held by Subsidiary (3)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
GETCO Holding Company, LLC
350 N. ORLEANS STREET
CHICAGO, IL 60654		     X    
GETCO Strategic Investments, LLC
350 N. ORLEANS STREET
CHICAGO, IL 60654		     X    

Signatures

 /s/ Alex Sadowski, Authorized Signatory   08/20/2012
**Signature of Reporting Person Date
 /s/ Alex Sadowski, Authorized Signatory   08/20/2012
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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) Shares of Series A-2 Convertible Preferred Stock will be convertible at the option of the holder into shares of Series A-1 Convertible Preferred Stock on a 1-for-1 basis at any time upon certifying that all required regulatory approvals have been obtained. In addition, if the closing price of the Class A Common Stock exceeds 200% of the then applicable conversion price for 60 consecutive trading days, all of the outstanding shares of Series A-2 Convertible Preferred Stock will mandatorily convert into shares of Class A Common Stock at a ratio of 666.667 shares of Class A Common Stock for each share of Series A-2 Convertible Preferred Stock (subject to customary anti-dilution adjustments), which reflects an approximate initial conversion price of $1.50 per share of Class A Common Stock. The Series A-2 Convertible Preferred Stock has no expiration date.
(2) Shares of Series A-1 Convertible Preferred Stock are convertible at the option of the holder into shares of Class A Common Stock at a ratio of 666.667 shares of Class A Common Stock for each share of Series A-1 Convertible Preferred Stock, subject to customary anti-dilution adjustments. Based on this conversion ratio, the 67,900 shares of Series A-1 Convertible Preferred Stock entitle the Reporting Persons to receive approximately 45,266,689 shares of Class A Common Stock on a fully-converted basis.
(3) These shares of Series A-2 Convertible Preferred Stock are directly held by GETCO Strategic Investments, LLC. The Reporting Persons disclaim beneficial ownership of the securities reported herein except to the extent of their pecuniary interest therein and this report shall not be deemed an admission that any such Reporting Person is the beneficial owner of, or has any pecuniary interest in, such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

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