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

Rhea-AI Filing Summary

Interactive Brokers Group director and Vice Chairman Earl H. Nemser reported sales of Class A common stock on 08/14/2025. The Form 4 discloses two dispositions executed under a 10b5-1 plan: 33,379 shares sold at a weighted average price of $63.86 and 20,521 shares sold at a weighted average price of $64.22. The reporting tables show holdings attributable to EN Holdings LLC and list 427,812 Class A shares in total, including vested and unvested restricted stock units. The filing includes an explanatory note that EN Holdings LLC is owned by the reporting person and his affiliates and that sale prices reflect multiple transactions within the stated ranges.

Insights

Corporate Governance Expert

TL;DR: Insider sold 53,900 Class A shares under a 10b5-1 plan, reducing indirect holdings; transaction appears orderly, not an unscheduled dump.

The filing shows planned dispositions under a 10b5-1 written plan, which provides an affirmative defense under Rule 10b5-1 and typically indicates pre-arranged, non-discretionary trading. The sales were completed in multiple tranches at weighted average prices of $63.86 and $64.22. holdings are reported via EN Holdings LLC, suggesting indirect ownership structures remain in place. For governance review, note the combination of direct officer/director status and use of an affiliated LLC to hold shares, which is common but relevant to beneficial ownership transparency.

Securities Analyst

TL;DR: Insider disposed of 53,900 shares at ~$64 under a 10b5-1 plan; transaction size is modest relative to reported total holdings.

The Form 4 discloses two sold tranches totaling 53,900 shares with reported price ranges $63.03–$64.55 and weighted averages near $64. The reporting person still has shares attributable to EN Holdings LLC and restricted stock units aggregating 427,812 shares per the form. From a securities perspective, the filing indicates liquidity actions rather than a change in control or material corporate event. Impact on float and market liquidity is likely minor absent larger concurrent transactions.

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)
08/14/2025

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	08/14/2025		S		33,379	D	$63.86(2)	420,521(1)	I	by EN Holdings LLC
Class A common stock	08/14/2025		S		20,521	D	$64.22(3)	400,000(1)	I	by EN Holdings LLC
Class A common stock								427,812(4)	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 $63.03 to $64.02. 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) - (3) 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 $64.03 to $64.55.

4. 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	08/15/2025
	** Signature of Reporting Person	Date
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