Interactive Brokers (IBKR) director adds 75 shares in open-market buys

Rhea-AI Filing Summary

Interactive Brokers Group director Lori A. Conkling reported two open-market purchases of Class A common stock. She bought 50 shares at $73.21 per share on February 25, 2026 and 25 shares at $69.21 per share on March 2, 2026, totaling 75 shares.

After these transactions, she directly owned 2,409 shares. A footnote explains this amount includes shares she acquired plus both vested and unvested restricted stock units granted under the company’s 2007 Stock Incentive Plan.

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

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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^*

Conkling Lori A

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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	02/25/2026		P		50	A	$73.21	2,384(1)	D
Class A common stock	03/02/2026		P		25	A	$69.21	2,409(1)	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. This amount includes (a) securities acquired by the Reporting Person; (b) Class A common stock attributable to vested restricted stock units that were awarded under the 2007 Stock Incentive Plan as amended ("Plan"); and (c) unvested restricted stock units that were awarded under the Plan.

Remarks:

The Reporting Person is hereby disclosing delinquent transactions reportable on Form 4 that were not reported due to an inadvertent oversight. These shares were purchased pursuant to a 10b5-1 trading plan.

	/s/ Matthew Kelly as authorized signatory for Lori A Conkling	03/26/2026
	** 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)

FAQ

What insider transactions did IBKR director Lori A. Conkling report?

Lori A. Conkling reported two open-market purchases of Interactive Brokers Group Class A common stock, totaling 75 shares. She bought 50 shares at $73.21 on February 25, 2026 and 25 shares at $69.21 on March 2, 2026.

At what prices did Lori A. Conkling buy IBKR Class A shares?

She purchased IBKR Class A common stock at two different prices: 50 shares at $73.21 per share and 25 shares at $69.21 per share. Both transactions were coded as open-market purchases under SEC rules.

How many IBKR shares does Lori A. Conkling own after these trades?

Following the reported purchases, Lori A. Conkling directly owned 2,409 shares of Interactive Brokers Group Class A common stock. A footnote states this figure also reflects vested and unvested restricted stock units awarded under the company’s 2007 Stock Incentive Plan.

What type of Form 4 transactions did IBKR report for Lori A. Conkling?

The Form 4 shows two non-derivative transactions classified as open-market purchases of Class A common stock. Both transactions carry code “P,” indicating purchases in the open market or private transactions, with no derivative exercises or sales reported in this filing.

Does Lori A. Conkling’s IBKR position include restricted stock units?

Yes. A footnote explains her reported holdings include securities she acquired directly plus Class A shares attributable to vested and unvested restricted stock units granted under the 2007 Stock Incentive Plan, meaning part of the 2,409 total relates to equity awards.

Were any IBKR shares sold by Lori A. Conkling in this Form 4?

No. The transaction summary shows two buy transactions and zero sales. Net activity was a purchase of 75 shares of Class A common stock, with no dispositions, gifts, tax withholdings, or derivative exercises reported in this particular Form 4.