[SCHEDULE 13G/A] Interactive Brokers Group, Inc. SEC Filing

Rhea-AI Filing Summary

The Vanguard Group reports beneficial ownership of 50,758,486 shares of Interactive Brokers Group Inc, representing 11.40% of the common stock. Vanguard indicates it has no sole voting power and 2,422,392 shares of shared voting power, while retaining 47,231,170 shares of sole dispositive power and 3,527,316 shares of shared dispositive power. The filing states these holdings are held in the ordinary course of business and are not intended to change or influence control of the issuer. The report identifies Vanguard as an investment-adviser type filer and provides its principal business address.

Positive

• Material disclosed stake: Vanguard beneficially owns 50,758,486 shares (11.40%), a clear signal of substantial institutional ownership.
• Passive intent declared: Filing certifies holdings are in the ordinary course of business and not held to change or influence control, indicating no immediate activist intent.
• Clear voting/dispositive breakdown: Report provides specific counts for shared voting power (2,422,392) and sole dispositive power (47,231,170), aiding transparency.

Negative

• None.

Insights

Securities Analyst

TL;DR: Vanguard holds a material passive stake (11.4%) with limited voting influence.

Vanguard's reported 11.40% position is economically significant and exceeds the 5% disclosure threshold, but the declaration of passive intent and zero sole voting power suggest this is a routine asset-management holding rather than an activist stake. The large sole dispositive power indicates control over trading decisions for client accounts, while shared voting power is modest relative to the position size. For investors, the entry confirms a major institutional owner but does not signal governance intervention.

Corporate Governance Expert

TL;DR: A sizable institutional stake is disclosed, yet the filing affirms no intent to influence company control.

From a governance perspective, an 11.4% ownership by a single institutional manager warrants attention because it can affect shareholder composition and liquidity. However, the Schedule 13G classification and explicit certification that the stake is held in the ordinary course reduce the likelihood of imminent activist engagement. The modest shared voting power relative to total shares suggests limited direct voting influence unless coordinated with other holders.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 12)

Interactive Brokers Group Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

45841N107

(CUSIP Number)

08/29/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 45841N107

1

Names of Reporting Persons

The Vanguard Group

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,422,392.00
7	Sole Dispositive Power 47,231,170.00
8	Shared Dispositive Power 3,527,316.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

50,758,486.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

11.40 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Interactive Brokers Group Inc
(b)	Address of issuer's principal executive offices: 1 Pickwick Plaza, Greenwich, CT, 06830
Item 2.
(a)	Name of person filing: The Vanguard Group
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd., Malvern, PA 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 45841N107
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 50758486
(b)	Percent of class: 11.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 2422392
	(iii) Sole power to dispose or to direct the disposition of: 47231170
	(iv) Shared power to dispose or to direct the disposition of: 3527316
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The Vanguard Group, Inc.'s clients, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein. No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

The Vanguard Group

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	09/08/2025

FAQ

How many shares of IBKR does The Vanguard Group report owning?

The Vanguard Group reports beneficial ownership of 50,758,486 shares of Interactive Brokers Group Inc.

What percentage of IBKR does Vanguard's stake represent?

Vanguard's reported position represents 11.40% of the company's common stock.

Does Vanguard have sole voting power over IBKR shares?

No. The filing reports 0 shares with sole voting power and 2,422,392 shares with shared voting power.

Does Vanguard control the disposition of the reported IBKR shares?

Vanguard reports 47,231,170 shares with sole dispositive power and 3,527,316 shares with shared dispositive power.

Is Vanguard attempting to influence control of Interactive Brokers Group?

The filing includes a certification that the securities are held in the ordinary course of business and were not acquired and are not held for the purpose of changing or influencing control of the issuer.