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

Rhea-AI Filing Summary

Insider: Earl H. Nemser, Vice Chairman & Director of Interactive Brokers Group (IBKR).

Transaction: On 07/28/2025 Nemser executed an open-market sale (Code S) of 100 Class A shares at $65.90 per share through his affiliate EN Holdings LLC.

Post-transaction holdings: 399,900 Class A shares held indirectly via EN Holdings LLC and 427,812 shares held directly (vested & unvested RSUs), totaling roughly 827,712 shares.

The sale represents <0.01 % of both IBKR’s outstanding shares and Nemser’s reported stake, signalling no meaningful change in ownership or control. No derivative security activity was disclosed.

Insights

Securities Analyst

TL;DR: De minimis insider sale; immaterial to ownership structure or market sentiment.

The 100-share sale at $65.90 reduces Nemser’s indirect stake by only 0.025 %. With ~827k shares remaining, governance alignment stays intact. No derivatives indicate straightforward liquidity management rather than hedging or signal of concern. Market impact expected to be neutral.

Corporate Governance Specialist

TL;DR: Ownership oversight unchanged; transaction raises no governance red flags.

Nemser retains substantial equity, preserving incentive alignment with shareholders. Transaction complies with Section 16 reporting and does not trigger any control thresholds. Lack of 10b5-1 plan disclosure suggests discretionary timing but scale is too small for concern.

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).

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)
07/28/2025

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	07/28/2025		S		100	D	$65.9	399,900(1)	I	by EN Holdings LLC
Class A common stock								427,812(2)	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. 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	07/30/2025
	** 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

How many Interactive Brokers (IBKR) shares did Earl H. Nemser sell?

He sold 100 Class A common shares on 07/28/2025.

At what price were the IBKR shares sold?

The shares were sold at $65.90 per share.

How many IBKR shares does Nemser own after the sale?

He owns 399,900 shares indirectly via EN Holdings LLC and 427,812 shares directly, totaling roughly 827,712 shares.

What does transaction code "S" signify in a Form 4?

Code S denotes an open-market sale of the issuer’s securities.

Were any derivative securities involved in this filing?

No. The filing reports only non-derivative Class A common stock activity.

Is the sale considered material to IBKR investors?

Given its tiny scale (<0.01 % of shares outstanding), the sale is generally not material to investors.