UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported):  July 26, 2019

INTERACTIVE BROKERS GROUP, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware	001-33440	30-0390693
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification  Number)

One Pickwick Plaza, Greenwich, CT 06830

(Address of Principal Executive Offices) (Zip Code)

(203) 618-5800

(Registrant’s Telephone Number, Including Area Code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

□ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

□ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

□ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

□ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Title of each class	Trading Symbol	Name of the exchange on which registered
Common Stock, par value $.01 per share	IBKR	The Investors Exchange LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company □

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    □

Item 8.01. Other Events.

In connection with the July 26, 2019 takedown, by a Rule 424(b)(5) prospectus of Interactive Brokers Group, Inc. (the "Company"), of 21,075 shares of the Company's common stock from its shelf Registration Statement on Form S-3 (Registration Statement No. 333-219552) (the "Registration Statement") filed with the SEC on July 28, 2017, the legal opinion letter of Dechert LLP, counsel to the Company, regarding the validity of the Shares is filed as Exhibit 5.3 to this Current Report on Form 8-K. The legal opinion letter is also hereby incorporated by reference into the Registration Statement, as Exhibit 5.3 thereto.

Item 9.01. Financial Statements and Exhibits

 (d)Exhibits

Exhibit Number	Description
5.3	Opinion of Dechert LLP (*)

(*) Filed herewith.

***

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 26, 2019

INTERACTIVE BROKERS GROUP, INC.
By:	/s/ Paul J. Brody
Name:	Paul J. Brody
Title:	Chief Financial Officer, Treasurer and Secretary