Interactive Brokers Group, Inc.

CANTILLON CAPITAL MANAGEMENT LLC IBKR

Report date

12/31/2025

Quarter

2025 Q4

Filed

2/11/2026

Shares

12,759,904

Value ($000)

820,589

Weight

4.4%

2019 Q4 - 2025 Q4 (25 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2025 Q4	2/11/2026	820,589	4.4%	12,759,904	12/31/2025
2025 Q3	2/17/2026	871,412	4.8%	12,664,026	9/30/2025
2025 Q2	2/17/2026	709,449	4.1%	12,803,631	6/30/2025
2025 Q1	2/17/2026	545,425	3.5%	3,293,826	3/31/2025
2024 Q4	2/5/2025	599,917	3.6%	3,395,690	12/31/2024
2024 Q3	11/7/2024	470,708	2.9%	3,377,643	9/30/2024
2024 Q2	8/5/2024	426,473	2.9%	3,478,575	6/30/2024
2024 Q1	5/8/2024	408,379	2.6%	3,655,704	3/31/2024
2023 Q4	2/7/2024	309,123	2.1%	3,728,869	12/31/2023
2023 Q3	11/6/2023	330,627	2.5%	3,819,629	9/30/2023
2023 Q2	8/9/2023	318,529	2.2%	3,834,468	6/30/2023
2023 Q1	5/4/2023	297,579	2.4%	3,604,400	3/31/2023
2022 Q4	2/6/2023	232,982	2.0%	3,220,214	12/31/2022
2022 Q3	11/3/2022	157,914	1.4%	2,470,872	9/30/2022
2022 Q2	8/3/2022	137,135	1.1%	2,492,911	6/30/2022
2022 Q1	5/3/2022	146,617	1.0%	2,224,503	3/31/2022
2021 Q4	1/27/2022	171,745	1.1%	2,162,492	12/31/2021
2021 Q3	10/26/2021	144,992	1.0%	2,325,818	9/30/2021
2021 Q2	7/27/2021	155,062	1.0%	2,359,066	6/30/2021
2021 Q1	5/3/2021	175,097	1.3%	2,397,278	3/31/2021
2020 Q4	2/3/2021	150,985	1.1%	2,478,421	12/31/2020
2020 Q3	10/30/2020	120,266	1.0%	2,488,447	9/30/2020
2020 Q2	7/31/2020	105,013	0.9%	2,514,083	6/30/2020
2020 Q1	4/30/2020	107,721	1.2%	2,495,290	3/31/2020
2019 Q4	2/7/2020	116,664	1.1%	2,502,438	12/31/2019