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

Rhea-AI Filing Summary

Interactive Brokers Group director and Vice Chairman Earl H. Nemser reported multiple disposals of Class A common stock in a Form 4 filing. The transactions on 08/12/2025 and 08/13/2025 show sales executed by or attributed to EN Holdings LLC, an entity owned by the reporting person and affiliates. Total reported disposals include blocks of 153,000, 41,086, 4,600, 200, 200, 2,400, and 200 shares at weighted-average prices ranging roughly from $63.75 to $68.04. Following the transactions, EN Holdings LLC beneficially owned between 502,586 and 453,900 shares depending on line items; the filing also discloses 427,812 shares attributable to vested and unvested restricted stock units under the company plan.

Positive

• Transactions disclosed with attribution: Sales are reported as conducted by EN Holdings LLC and ownership is clearly attributed to the reporting person and affiliates.
• Rule 10b5-1 plan indicated: The filer checked the box indicating the trades were pursuant to a written plan, which may support affirmative defense to insider trading claims.
• Transparency commitment: The reporting person offers to provide per-price breakdowns on request, supplementing the weighted-average prices disclosed.

Negative

• Significant share disposals: Large blocks were sold (e.g., 153,000 shares on 08/12/2025), reducing beneficial holdings reported for EN Holdings LLC.
• Aggregated pricing: Prices are reported as weighted averages with ranges in footnotes rather than per-transaction prices, requiring follow-up for precise trade-level detail.

Insights

Securities Analyst

TL;DR: Senior insider executed multiple sales through an affiliated entity over two days, reducing direct beneficial holdings.

The Form 4 confirms that Earl H. Nemser, a director and Vice Chairman, conducted a series of Class A share sales on 08/12/2025 and 08/13/2025 via EN Holdings LLC. The filing reports multiple weighted-average sale prices across the trades, with ranges provided in footnotes rather than single per-trade prices. The disclosure clarifies EN Holdings LLC is owned by the reporting person and affiliates, and the filing separately identifies shares tied to vested and unvested restricted stock units under the 2007 Stock Incentive Plan. The filing also indicates a plan-based sale (box checked for Rule 10b5-1(c)). From an investor-reporting perspective, the submission is detailed and includes commitments to provide per-price breakdowns on request, which supports transparency despite aggregated weighted-average pricing.

Corporate Governance Expert

TL;DR: Multiple insider disposals disclosed; transaction structure and 10b5-1 notation are material for governance review.

The Form 4 shows that the reporting person used an affiliate vehicle, EN Holdings LLC, for share ownership and executed multiple disposals across two dates. The filing properly attributes indirect ownership and documents restricted stock units separately, including vested and unvested amounts totaling 427,812 shares. The checked box indicating the trades were pursuant to a Rule 10b5-1(c) plan signals the transactions may have been preplanned, which is relevant for board-level compliance oversight. The reporting person authorized signature is executed by an authorized signatory, and the filer offers to provide transaction-level pricing details upon request, aligning with disclosure expectations.

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
Estimated average burden
hours per response:			0.5

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)
08/12/2025

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	08/12/2025		S		153,000	D	$67.39(2)	502,586(1)	I	by EN Holdings LLC
Class A common stock	08/12/2025		S		41,086	D	$67.88(3)	461,500(1)	I	by EN Holdings LLC
Class A common stock	08/13/2025		S		4,600	D	$63.75(4)	456,900(1)	I	by EN Holdings LLC
Class A common stock	08/13/2025		S		200	D	$64.19(5)	456,700(1)	I	by EN Holdings LLC
Class A common stock	08/13/2025		S		200	D	$66.09(6)	456,500(1)	I	by EN Holdings LLC
Class A common stock	08/13/2025		S		2,400	D	$66.77(7)	454,100(1)	I	by EN Holdings LLC
Class A common stock	08/13/2025		S		200	D	$67.2	453,900(1)	I	by EN Holdings LLC
Class A common stock								427,812(8)	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 $66.76 to $67.75. 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) - (7) 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 $67.76 to $68.04.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.18 to $64.17.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.18 to $65.17.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.18 to $66.17.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.18 to $67.06.

8. 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	08/14/2025
	** 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 did Earl H. Nemser report on the Form 4 for IBKR?

The Form 4 reports multiple sales of IBKR Class A common stock by or for EN Holdings LLC, an entity owned by the reporting person and affiliates, on 08/12/2025 and 08/13/2025.

How many shares were sold and at what prices?

Reported disposals include 153,000, 41,086, 4,600, 200, 200, 2,400, and 200 shares at weighted-average prices roughly from $63.75 to $68.04 (ranges provided in footnotes).

How many IBKR shares does EN Holdings LLC beneficially own after these transactions?

The filing shows amounts reported after transactions ranging by line item, for example 502,586, 461,500, down to 453,900, and also separately notes 427,812 shares attributable to vested and unvested restricted stock units.

Were the transactions part of a Rule 10b5-1 trading plan?

Yes, the filer checked the box indicating the transactions were made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c) affirmative defense conditions.

Who signed the Form 4 filing for the reporting person?

The Form 4 was signed by /s/ Raymond Bussiere as authorized signatory for Earl H. Nemser on 08/14/2025.