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

Rhea-AI Filing Summary

Earl H. Nemser, Vice Chairman and director of Interactive Brokers Group, Inc. (IBKR), reported multiple sales of Class A common stock on this Form 4. The filing shows sales executed on 08/08/2025 and 08/11/2025 by EN Holdings LLC, an entity owned by the reporting person and his affiliates. The Form lists sales of 10,200 shares at a weighted average price of $65.60, 2,641 shares at $65.94, and 12,841 shares at $66.09, with price ranges disclosed in footnotes.

The filing reports post-transaction beneficial ownership figures associated with EN Holdings LLC including 671,068, 668,427 and 655,586 shares on the respective lines, and separately notes 427,812 shares attributable to vested and unvested restricted stock units awarded under the company plan. The form is signed by an authorized signatory on 08/12/2025.

Positive

• Timely and detailed SEC disclosure of insider sales with weighted-average prices and price ranges provided in footnotes.
• Substantial continued indirect ownership is documented: EN Holdings LLC is shown with post-transaction beneficial ownership figures (e.g., 655,586 to 671,068 shares) and 427,812 RSU-related shares.

Negative

• Insider sales reported: a total of 25,682 Class A shares were sold across 08/08/2025 and 08/11/2025 at weighted-average prices of $65.60, $65.94, and $66.09.
• Reduction in holdings is reflected by the post-transaction beneficial ownership figures shown on the form.

Insights

Securities Analyst

TL;DR: Routine disclosure of insider sales by the vice chairman; sizable indirect holdings remain after disclosed transactions.

The Form 4 documents three grouped sales by EN Holdings LLC on 08/08/2025 and 08/11/2025 totaling 25,682 Class A shares sold at weighted-average prices reported as $65.60, $65.94, and $66.09. Footnotes disclose the price ranges for the component trades and confirm EN Holdings LLC is owned by the reporting person and affiliates. Post-transaction beneficial ownership figures are provided on each line and a separate entry discloses 427,812 shares from vested and unvested restricted stock units. For investors this is a transparent, contemporaneous reporting of insider sales; it documents liquidity events but does not itself explain motivation.

Corporate Governance Expert

TL;DR: Disclosure appears complete and includes explanatory footnotes; continued indirect ownership remains material.

The filer used EN Holdings LLC to report indirect ownership and provided weighted-average prices plus ranges for the multiple transactions. The Form includes an explanation that EN Holdings LLC is owned by the reporting person and affiliates and discloses restricted stock unit amounts attributable to the reporting person. The filing is signed by an authorized signatory on 08/12/2025. From a governance perspective this is a standard Section 16 disclosure of insider sales with supporting details; the filing preserves regulatory transparency but does not alter governance control disclosures shown on the form.

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

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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^*

Nemser Earl H

(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)
	Vice Chairman

3. Date of Earliest Transaction (Month/Day/Year)
08/08/2025

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	08/08/2025		S		10,200	D	$65.6(2)	671,068(1)	I	by EN Holdings LLC
Class A common stock	08/08/2025		S		2,641	D	$65.94(3)	668,427(1)	I	by EN Holdings LLC
Class A common stock	08/11/2025		S		12,841	D	$66.09(4)	655,586(1)	I	by EN Holdings LLC
Class A common stock								427,812(5)	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 owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.90 to $65.89. 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) - (4) 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 $65.90 to $66.00.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.63 to $66.42.

5. 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 Earl H. Nemser	08/12/2025
	** 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.
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FAQ

What did the IBKR Form 4 filed by Earl H. Nemser report?

The Form 4 reports multiple sales by EN Holdings LLC beneficially owned by Earl H. Nemser totaling 25,682 Class A shares on 08/08/2025 and 08/11/2025.

At what prices were the IBKR shares sold according to the Form 4?

The filing shows weighted-average prices of $65.60, $65.94, and $66.09, with component trade price ranges disclosed in footnotes.

How is ownership held according to the Form 4 for IBKR insider Nemser?

The securities are reported as indirectly owned by EN Holdings LLC, which the filing states is owned by the reporting person and his affiliates.

Does the Form 4 disclose restricted stock units for IBKR?

Yes. The filing notes 427,812 Class A shares attributable to vested and unvested restricted stock units awarded under the company plan.

When was the Form 4 signed and filed?

The Form 4 bears an authorized signatory signature dated 08/12/2025.