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

Rhea-AI Filing Summary

Interactive Brokers Group (IBKR) Form 4 highlights: Vice-Chairman & Director Earl H. Nemser, through affiliate EN Holdings LLC, sold 39,786 Class A shares on 30-Jul-2025 in two open-market transactions:

• 32,386 shares at a weighted average price of $66.32
• 7,400 shares at a weighted average price of $66.64

Following the sales, Nemser indirectly owns 360,114 shares via EN Holdings LLC and directly holds 427,812 shares (including vested and unvested RSUs), leaving him with an estimated total stake of 787,926 shares. The filing does not state that the trades were made under a Rule 10b5-1 trading plan.

The transactions reduce Nemser’s indirect position by roughly 10% but leave his overall economic interest substantial, suggesting liquidity rather than exit. No derivative activity was reported.

Positive

• Executive still retains roughly 788 k shares, indicating continued long-term alignment with shareholders and confidence in IBKR's outlook.

Negative

• Vice-chairman sold 39,786 shares (~$2.6 m), a ~10% cut to his indirect position, which can signal reduced confidence or need for liquidity.
• No Rule 10b5-1 plan disclosed, leaving timing of the trades open to interpretation and potential scrutiny.

Insights

Senior Equity Analyst

TL;DR: Large insider sale (≈$2.6 m) is modestly bearish but stake remains sizable; no 10b5-1 plan disclosed.

The vice-chairman’s disposal of 39,786 shares (~$2.6 m at the reported averages) trims his indirect holding to 360 k shares. While insider selling is often interpreted negatively, the remaining 788 k-share aggregate stake preserves substantial alignment with shareholders. Absence of a disclosed 10b5-1 plan may raise questions about timing, but volume represents <5 days of average trading and should be easily absorbed. Overall impact: slightly negative sentiment, minimal fundamental effect.

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)
07/30/2025

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	07/30/2025		S		32,386	D	$66.32(2)	367,514(1)	I	by EN Holdings LLC
Class A common stock	07/30/2025		S		7,400	D	$66.64(3)	360,114(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 $65.58 to $66.57. 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 $66.58 to $66.73.

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	08/01/2025
	** 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 IBKR shares did Vice-Chairman Earl H. Nemser sell?

39,786 Class A shares were sold on 30-Jul-2025.

What was the average sale price of the IBKR shares?

Weighted averages were $66.32 and $66.64 for the two transaction blocks.

How many IBKR shares does Nemser own after the sale?

He indirectly owns 360,114 shares and directly holds 427,812, totaling about 787,926 shares.

Were the sales made under a 10b5-1 trading plan?

The filing does not indicate that the transactions were executed under Rule 10b5-1.

Did the filing report any derivative transactions?

No, Table II lists no derivative activity for this period.