Interactive Brokers Group Ownership | Who Owns Interactive Brokers Group?

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Interactive Brokers Group Ownership Summary

Interactive Brokers Group is owned by 57.25% institutional investors, 2.87% insiders, and 39.87% retail investors. Vanguard group is the largest institutional shareholder, holding 11.73% of IBKR shares. iShares Core S&P Mid-Cap ETF is the top mutual fund, with 3.22% of its assets in Interactive Brokers Group shares.

IBKR Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Interactive Brokers Group	57.25%	2.87%	39.87%
Sector	Financial Services Stocks	32.19%	15.44%	52.37%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Vanguard group	52.25M	11.73%	$3.36B
Blackrock	9.30M	8.69%	$1.14B
Blackrock funding, inc. /de	31.68M	7.11%	$2.04B
State street	18.65M	4.25%	$1.28B
Cantillon capital management	12.76M	2.87%	$820.59M
Kayne anderson rudnick investment management	12.17M	2.78%	$837.73M
Wellington management group llp	10.90M	2.49%	$750.11M
Geode capital management	10.20M	2.29%	$654.26M
Orbis allan gray	9.54M	2.18%	$656.71M
Greenwich wealth management	9.19M	2.06%	$590.69M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Hengistbury investment partners llp	1.14M	32.80%	$73.06M
Oakcliff capital partners, lp	1.03M	30.61%	$70.93M
Ancient art	1.64M	27.18%	$113.10M
Greenwich wealth management	9.19M	26.35%	$590.69M
Systrade	500.00K	19.62%	$32.16M
Brooktree capital management	400.73K	17.14%	$25.77M
Lansing management lp	337.99K	16.87%	$23.26M
Bares capital management	2.06M	13.08%	$141.79M
Rv capital	752.48K	11.27%	$48.39M
Bronte capital management pty	1.49M	9.53%	$95.58M

Top Buyers

Holder	Shares	% Assets	Change
Norges bank	7.05M	0.05%	7.05M
State street	18.65M	0.04%	3.52M
Wellington management group llp	10.90M	0.13%	1.63M
Bessemer group	1.53M	0.15%	1.52M
Worldquant millennium advisors	1.37M	0.41%	1.37M

Top Sellers

Holder	Shares	% Assets	Change
Agf management	-	-	-2.06M
Marshall wace, llp	3.48M	0.24%	-1.93M
Jpmorgan chase	7.44M	0.03%	-1.61M
Qube research	-	-	-1.52M
Citigroup	992.68K	0.03%	-1.44M

New Positions

Holder	Shares	% Assets	Change	Value
Norges bank	7.05M	0.05%	7.05M	$453.15M
Bristol gate capital partners	1.21M	4.50%	1.21M	$77.93M
Adage capital partners gp	405.30K	0.04%	405.30K	$27.89M
Ofi invest asset management	347.63K	0.27%	347.63K	$19.04M
Blue whale capital llp	315.58K	1.20%	315.58K	$21.72M

Sold Out

Holder	Change
Northwest financial advisors	-2.00
Blume capital management	-2.00
Claris advisors, llc / mo /	-2.00
Castleview partners	-3.00
Migdal insurance & financial	-4.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	716	-24.95%	254,998,782	-32.75%	57	0.77%	337	-33.79%	251	-16.33%
Sep 30, 2025	704	-14.77%	261,205,947	-29.31%	59	0.84%	374	-51.43%	227	1094.74%
Jun 30, 2025	831	6.40%	376,882,120	302.56%	85	1.16%	772	91.56%	18	-92.94%
Mar 31, 2025	767	4.35%	93,565,490	0.04%	85	1.16%	393	-1.50%	254	8.09%
Dec 31, 2024	426	-29.47%	56,720,993	-37.97%	52	0.74%	229	-28.88%	143	-23.12%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Mid-Cap ETF	14.20M	3.22%	-25.52K
Vanguard US Total Market Shares ETF	3.27M	3.00%	53.98K
Vanguard Total Stock Mkt Idx Inv	13.38M	3.00%	22.54K
Vanguard 500 Index Investor	11.45M	2.57%	109.32K
Vanguard Mid Cap Index Institutional	9.20M	2.06%	32.05K
iShares Core S&P 500 ETF	5.73M	1.28%	-3.12K
Fidelity 500 Index	5.67M	1.27%	9.35K
Fidelity Magellan	5.34M	1.20%	5.34M
SPDR® S&P 500® ETF	5.26M	1.18%	64.77K
State Street® SPDR® S&P 500® ETF	5.20M	1.17%	11.65K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Apr 01, 2026	Conkling Lori A	-	Buy	$1.71K
Feb 25, 2026	Conkling Lori A	-	Buy	$3.66K
Mar 02, 2026	Conkling Lori A	-	Buy	$1.73K
Jan 26, 2026	Nemser Earl H	Vice Chairman	Sell	$4.62M
Jan 26, 2026	Nemser Earl H	Vice Chairman	Sell	$2.36M

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	1	-
2026 Q1	2	8
2025 Q4	1	5
2025 Q3	-	64
2025 Q2	-	-

IBKR Ownership FAQ

Who owns the most shares of Interactive Brokers Group?

Interactive Brokers Group’s largest shareholders are Vanguard group (52.25M shares, 11.73%), Blackrock (9.3M shares, 8.69%), and Blackrock funding, inc. /de (31.68M shares, 7.11%). Together, they hold 27.53% of Interactive Brokers Group’s total shares outstanding.

Does Blackrock own Interactive Brokers Group?

Yes, BlackRock owns 8.69% of Interactive Brokers Group, totaling 9.3M shares as of Jun 2024. This represents 0.03% of BlackRock's total assets, with a market value of 1.14B$. In the last quarter, BlackRock increased its holdings by 210.61K shares, a 2.32% change.

Who is Interactive Brokers Group’s biggest shareholder by percentage of total assets invested?

Hengistbury investment partners llp is Interactive Brokers Group’s biggest shareholder by percentage of total assets invested, with 32.80% of its assets in 1.14M Interactive Brokers Group shares, valued at 73.06M$.

Who is the top mutual fund holder of Interactive Brokers Group shares?

iShares Core S&P Mid-Cap ETF is the top mutual fund holder of Interactive Brokers Group shares, with 3.22% of its total shares outstanding invested in 14.2M Interactive Brokers Group shares.

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