Cantillon Capital Management LLC

Position in IBKR — Interactive Brokers Group, Inc.

CIK 1279936 New York, NY

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Position in IBKR

as of Jun 30, 2026 · filed Jul 29, 2026 Compact

Position Value

$45,072,184

-$709,189,053 QoQ

Shares Held

517,833

-95.4% QoQ

Ownership

0.114%

of shares outstanding

% of Portfolio

6.78%

of 13F equity value

Holder Rank

#110

of 1,105 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in IBKR Over Time

Shares Held

Position Value (USD)

Position in Capital Markets

Financial Services · as of Jun 30, 2026

Cantillon Capital Management LLC holds $55,934,027 across 2 Capital Markets names. IBKR ranks #1 (80.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)	Open
1	IBKR	Interactive Brokers Group, Inc. This page	517,833	$45,072,184
2	TW	Tradeweb Markets Inc.	108,989	$10,861,843

All Filings in IBKR

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26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$45,072,184	517,833	-95.4%	Shares	Defined	2026-07-29
2026-03-31	$754,261,237	11,245,881	-11.9%	Shares	Defined	2026-05-07
2025-12-31	$820,589,426	12,759,904	+0.8%	Shares	Defined	2026-02-11
2025-09-30	$871,411,628	12,664,026	-1.1%	Shares	Defined	2026-02-17
2025-06-30	$709,449,192	12,803,631	+288.7%	Shares	Defined	2026-02-17
2025-03-31	$545,424,646	3,293,826	-3.0%	Shares	Defined	2026-02-17
2024-12-31	$599,916,551	3,395,690	+0.5%	Shares	Defined	2025-02-05
2024-09-30	$470,708,328	3,377,643	-2.9%	Shares	Defined	2024-11-07
2024-06-30	$426,473,294	3,478,575	-4.8%	Shares	Defined	2024-08-05
2024-03-31	$408,378,692	3,655,704	-2.0%	Shares	Defined	2024-05-08
2023-12-31	$309,123,239	3,728,869	-2.4%	Shares	Defined	2024-02-07
2023-09-30	$330,627,085	3,819,629	-0.4%	Shares	Defined	2023-11-06
2023-06-30	$318,529,256	3,834,468	+6.4%	Shares	Defined	2023-08-09
2023-03-31	$297,579,263	3,604,400	+11.9%	Shares	Defined	2023-05-04
2022-12-31	$232,982,482	3,220,214	+30.3%	Shares	Defined	2023-02-06
2022-09-30	$157,913,429	2,470,872	-0.9%	Shares	Defined	2022-11-03
2022-06-30	$137,135,033	2,492,911	+12.1%	Shares	Defined	2022-08-03
2022-03-31	$146,616,992	2,224,503	+2.9%	Shares	Defined	2022-05-03
2021-12-31	$171,745,114	2,162,492	-7.0%	Shares	Defined	2022-01-27
2021-09-30	$144,991,493	2,325,818	-1.4%	Shares	Defined	2021-10-26
2021-06-30	$155,061,407	2,359,066	-1.6%	Shares	Defined	2021-07-27
2021-03-31	$175,097,185	2,397,278	-3.3%	Shares	Defined	2021-05-03
2020-12-31	$150,985,407	2,478,421	-0.4%	Shares	Defined	2021-02-03
2020-09-30	$120,266,643	2,488,447	-1.0%	Shares	Defined	2020-10-30
2020-06-30	$105,013,245	2,514,083	+0.8%	Shares	Defined	2020-07-31
2020-03-31	$107,721,668	2,495,290	—	Shares	Defined	2020-04-30
No filing history on record for this holder in this stock.