[Form 4] Interactive Brokers Group, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Paul J. Brody, Chief Financial Officer and director of Interactive Brokers Group, Inc. (IBKR), reported multiple sales of Class A common stock in a Form 4. The filings show sales on September 19, 2025 totaling 50,553 and 140 shares at weighted-average prices of $64.61 and $65.19, respectively, and sales on September 22, 2025 totaling 14,639 and 563 shares at weighted-average prices of $63.94 and $64.61. After these transactions, beneficial ownership reported for entities controlled by the reporting person is shown as 108,401, 108,261, 93,622 and 93,059 shares in the corresponding rows, with an additional line noting 2,885,496 shares related to vested and unvested restricted stock units awarded under the 2007 Stock Incentive Plan. The filer checked the box indicating the sales were made pursuant to a Rule 10b5-1 plan.

Positive

• 10b5-1 plan disclosure checked, indicating prearranged trading instructions and procedural compliance
• Detailed footnotes provided explaining weighted-average price ranges and source of shares, enhancing transparency
• Substantial retained interest via RSUs (2,885,496 shares) shows continued economic alignment with the company

Negative

• Significant share disposals on September 19 and 22, 2025 (total sold shown across rows exceeding 65,000 shares), reducing immediately available holdings
• Multiple sale prices across ranges may indicate sizable executed volumes over the period

Insights

Financial Analyst

TL;DR: CFO executed planned sales under a 10b5-1 program, trimming direct/indirect holdings while retaining significant equity tied to RSUs.

The Form 4 discloses systematic disposals across two dates with weighted-average prices in the low-$60s, consistent with sales under an established 10b5-1 trading plan as indicated on the form. The reporting lines show remaining beneficial ownership both directly/indirectly and a large position tied to vested and unvested restricted stock units totaling 2,885,496 shares, which keeps substantial economic exposure aligned with management. For investors, these sales appear procedural rather than ad hoc given the 10b5-1 disclosure, but they do reduce the reporting person’s immediately available Class A shares.

Corporate Governance Expert

TL;DR: Insider complied with disclosure rules and used a 10b5-1 plan; sales are material in size but governance processes appear followed.

The Form 4 includes clear identification of the reporting person as CFO and director and documents multiple dispositions executed at weighted-average prices. The checked 10b5-1 box and the explanatory footnotes describing price ranges and the origin of shares from a partial redemption and RSU awards demonstrate procedural transparency. From a governance perspective, the filing shows adherence to insider-trading plan protocols and full explanation of share provenance, which supports compliance but also documents meaningful share reductions in the reporting entity’s indirect holdings.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Brody Paul Jonathan

(Last) (First) (Middle)

ONE PICKWICK PLAZA

(Street)

GREENWICH CT 06830

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Interactive Brokers Group, Inc. [ IBKR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/19/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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
Class A common stock	09/19/2025		S		50,553	D	$64.61(2)	108,401(1)	I	by PJB Holdings LLC
Class A common stock	09/19/2025		S		140	D	$65.19(3)	108,261(1)	I	by PJB Holdings LLC
Class A common stock	09/22/2025		S		14,639	D	$63.94(4)	93,622(1)	I	by PJB Holdings LLC
Class A common stock	09/22/2025		S		563	D	$64.61(5)	93,059(1)	I	by PJB Holdings LLC
Class A common stock								2,885,496(6)	D

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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.16 to $65.15. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (5) to this Form 4.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.16 to $65.29.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.48 to $64.47.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.48 to $64.73.

6. This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the amended 2007 Stock Incentive Plan ("Plan") and (b) unvested restricted stock units that were awarded under the Plan.

	/s/ Raymond Bussiere as authorized signatory for Paul J. Brody	09/23/2025
	** 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 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What trades did Paul J. Brody report on Form 4 for IBKR?

The Form 4 reports sales on 09/19/2025 of 50,553 and 140 Class A shares and on 09/22/2025 of 14,639 and 563 Class A shares.

Were the insider sales made under a Rule 10b5-1 plan for IBKR?

Yes. The filer checked the box indicating the transactions were made pursuant to a 10b5-1 trading plan.

How many shares related to restricted stock units does the filing disclose?

The filing includes a line noting 2,885,496 Class A shares attributable to vested and unvested restricted stock units under the 2007 Stock Incentive Plan.

What weighted-average prices were reported for the September 2025 sales?

Reported weighted-average prices were approximately $64.61, $65.19, $63.94, and $64.61 for the respective sale groups.

Does the Form 4 explain the source of the sold shares?

Yes. Footnotes state some shares were acquired by a related LLC in a partial redemption of its interest in IBG Holdings LLC and others relate to RSU awards.