SEC Form 3
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
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
Echinus Advisors, LLC

(Last) (First) (Middle)
63 CROSBY STREET
4TH FLOOR

(Street)
NEW YORK NY 10012

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
04/18/2019
3. Issuer Name and Ticker or Trading Symbol
Interactive Brokers Group, Inc. [ IBKR ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) X Other (specify below)
See Remarks
5. If Amendment, Date of 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
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)
Class A Common Stock, par value $0.01 per share 2,411,525 I See footnote(1)
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: 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
1. Name and Address of Reporting Person*
Echinus Advisors, LLC

(Last) (First) (Middle)
63 CROSBY STREET
4TH FLOOR

(Street)
NEW YORK NY 10012

(City) (State) (Zip)
1. Name and Address of Reporting Person*
Uhde Philip

(Last) (First) (Middle)
63 CROSBY STREET, 4TH FLOOR

(Street)
NEW YORK NY 10012

(City) (State) (Zip)
Explanation of Responses:
1. These securities are held for the account of Echinus Partners, LP, a Delaware limited partnership (the "Echinus Fund"). Echinus Advisors, LLC, a Delaware limited liability Company ("Echinus"), serves as the investment manager to the Echinus Fund. Mr. Philip Uhde ("Mr. Uhde") is the manager and majority controlling person of Echinus. In such capacities, each of Echinus and Mr. Uhde may be deemed to beneficially own the securities herein. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein, if any.
Remarks:
Echinus may be deemed a director by deputization of the Issuer by virtue of the fact that Mr. Uhde, currently serves on the board of directors of the Issuer.
/s/ Philip Uhde 04/25/2019
Echinus Advisors, LLC: by /s/ Philip Yang, its Chief Financial Officer & Chief Compliance Officer 04/25/2019
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
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