What price per share was used for Denis Mendonca’s IBKR tax-withholding disposition?

The filing shows a price of $84.42 per share for the 11,157 tax-withholding shares. A footnote explains this represents the closing price of Interactive Brokers Group Class A common stock on May 8, 2026, which is identified as the vesting date for the equity award.

Interactive Brokers Group (IBKR) CAO reports 11,157-share tax-withholding move

Filing Impact

(Very High)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Interactive Brokers Group, Inc. Chief Accounting Officer Denis Mendonca reported a tax-withholding disposition of 11,157 shares of Class A common stock on May 8, 2026. The shares were delivered to satisfy tax obligations at a reference price of $84.42 per share tied to a vesting date.

After this transaction, Mendonca directly holds 145,071 shares of Class A common stock, which the disclosure notes includes both shares attributable to vested restricted stock units and unvested restricted stock units granted under the amended 2007 Stock Incentive Plan.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Mendonca Denis

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Tax Withholding	Class A common stock	11,157	$84.42	$942K

Holdings After Transaction: Class A common stock — 145,071 shares (Direct, null)

Footnotes (1)

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

Tax-withholding shares: 11,157 shares Reference share price: $84.42 per share Shares held after transaction: 145,071 shares +2 more

5 metrics

Tax-withholding shares 11,157 shares Class A common stock used for tax-withholding on May 8, 2026

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

Shares held after transaction 145,071 shares Direct holdings after tax-withholding disposition

Tax-withholding transactions 1 transaction, 11,157 shares Aggregate tax-withholding activity in this Form 4

Net buy/sell shares 0 shares Net directional activity classified as neutral

Key Terms

tax-withholding disposition, restricted stock units, amended 2007 Stock Incentive Plan, Class A common stock, +1 more

5 terms

tax-withholding disposition financial

"tax-withholding disposition of 11,157 shares of Class A common stock"

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

"includes (a) Class A common stock attributable to vested 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

"restricted stock units that were awarded under the amended 2007 Stock Incentive Plan"

Class A common stock financial

"The price represents the closing price of the issuer's Class A common stock"

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.

Form 4 regulatory

"What did IBKR Chief Accounting Officer Denis Mendonca report in this Form 4?"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

05/28/2026 - 04:01 PM

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^*

Mendonca Denis

(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)
	Chief Accounting Officer

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A common stock	05/08/2026	05/26/2026	F		11,157	D	$84.42⁽¹⁾	145,071⁽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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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/ Denis Mendonca	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)

Source: View Original Filing on SEC EDGAR

FAQ

What did IBKR Chief Accounting Officer Denis Mendonca report in this Form 4?

Denis Mendonca reported a tax-withholding disposition of 11,157 shares of Interactive Brokers Group Class A common stock. The shares were delivered to cover tax obligations related to equity compensation vesting on May 8, 2026 at a reference price of $84.42.

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

The transaction involved 11,157 shares of Interactive Brokers Group Class A common stock. These shares were used to satisfy tax liabilities associated with vesting restricted stock units, rather than being sold in an open-market trade, according to the Form 4 disclosure details.

How many IBKR shares does Denis Mendonca hold after this Form 4 transaction?

After the reported transaction, Denis Mendonca holds 145,071 shares of Interactive Brokers Group Class A common stock directly. A footnote indicates this amount includes shares attributable to vested restricted stock units and unvested restricted stock units granted under the company’s amended 2007 Stock Incentive Plan.

What does the F transaction code mean in Denis Mendonca’s IBKR Form 4?

The F code represents a tax-withholding disposition, where shares are delivered to pay an exercise price or tax liability. In this Form 4, the 11,157 Interactive Brokers shares were used to cover tax obligations tied to vesting restricted stock units, not recorded as an open-market sale.

How are restricted stock units referenced in this IBKR insider transaction?

A footnote explains that Mendonca’s 145,071 reported shares include stock attributable to vested and unvested restricted stock units. These units were awarded under Interactive Brokers Group’s amended 2007 Stock Incentive Plan, linking the reported holdings directly to the company’s long-term equity compensation program.