IBKR EVP reports tax-withholding share disposition

Interactive Brokers Group, Inc. Executive Vice President Frank Thomas AJ reported a tax-related share disposition tied to equity compensation.

Rhea-AI Filing Summary

Interactive Brokers Group, Inc. Executive Vice President Frank Thomas AJ reported a tax-related share disposition tied to equity compensation. On May 8, 2026, 31,730 shares of Class A common stock were delivered at a reference price of $84.42 per share to cover tax obligations upon vesting of restricted stock units. This was a tax-withholding disposition, not an open-market sale. After this event, he directly held 251,518 shares of Class A common stock, a figure that includes both vested and unvested restricted stock units awarded under the amended 2007 Stock Incentive Plan.

Insider Trade Summary

Exercise Price or Tax Liability: 31,730 shares

Exercise Price or Tax Liability 1 txn

Insider Frank Thomas AJ

Role Executive Vice President

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Class A common stock	31,730	$84.42	$2.68M

Holdings After Transaction: Class A common stock — 251,518 shares (Direct)

Footnotes (2)

1. F1. The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.
2. F2. 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.

Key Figures

Shares withheld for taxes: 31,730 shares Reference share price: $84.42 per share Shares held after transaction: 251,518 shares

3 metrics

Shares withheld for taxes 31,730 shares Tax-withholding disposition on May 8, 2026

Reference share price $84.42 per share Closing price on May 8, 2026 used for vesting

Shares held after transaction 251,518 shares Direct holdings following tax-withholding disposition

Key Terms

tax-withholding disposition, restricted stock units, amended 2007 Stock Incentive Plan, Class A common stock

4 terms

tax-withholding disposition financial

"This was a tax-withholding disposition, not an open-market sale."

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

restricted stock units financial

"tax obligations upon vesting of restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

amended 2007 Stock Incentive Plan financial

"awarded under the amended 2007 Stock Incentive Plan ("Plan")."

Class A common stock financial

"31,730 shares of Class A common stock were delivered"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did IBKR executive Frank Thomas AJ report on this Form 4?

Frank Thomas AJ reported a tax-withholding disposition of 31,730 shares of Interactive Brokers Class A common stock. The shares were delivered to cover tax obligations when restricted stock units vested under the company’s amended 2007 Stock Incentive Plan.

Was the IBKR Form 4 transaction an open-market sale of shares?

No, the Form 4 shows a tax-withholding disposition, not an open-market sale. Shares were used to satisfy tax liabilities upon vesting of restricted stock units, using the May 8, 2026 closing price as the reference value.

How many IBKR shares were involved in the tax-withholding disposition?

The transaction involved 31,730 shares of Interactive Brokers Class A common stock. These shares were delivered to cover tax obligations related to vesting restricted stock units rather than being sold in the open market on an exchange.

What reference price was used for the IBKR tax-withholding shares on May 8, 2026?

The reference price was $84.42 per share, equal to the May 8, 2026 closing price of Interactive Brokers’ Class A common stock. This closing price was used to value the shares delivered for the tax-withholding disposition.

How many IBKR shares does Frank Thomas AJ hold after this Form 4 transaction?

After the transaction, Frank Thomas AJ directly held 251,518 shares of Interactive Brokers Class A common stock. This amount includes stock attributable to vested restricted stock units and unvested restricted stock units awarded under the amended 2007 Stock Incentive Plan.

What role does the amended 2007 Stock Incentive Plan play in this IBKR Form 4 filing?

The amended 2007 Stock Incentive Plan is the source of the restricted stock units that vested, triggering the tax-withholding disposition. Shares held after the transaction include both vested and unvested restricted stock units granted under this equity incentive plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/28/2026 - 04:01 PM Learn about SEC filing dates

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^*

Frank Thomas AJ

(Last) (First) (Middle)

ONE PICKWICK PLAZA

(Street)

GREENWICH CONNECTICUT 06830

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Interactive Brokers Group, Inc. [ IBKR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Vice President

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/08/2026	05/26/2026	F		31,730	D	$84.42(1)	251,518(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. The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.

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 Thomas AJ Frank	05/28/2026
	** 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.
* Form 4: SEC 1474 (03-26)