Interactive Brokers Group, Inc.
Interactive Brokers Group, Inc. (IBKR) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IBKR · as of Sep 30, 2025
Ownership Breakdown
960
Institutional Holders
▲ 110 vs Q2
$26.15B
Total Inst. Value
▲ $5.15B vs Q2
443.38M
Shares Outstanding
freeFloat 97.57%
379.64M
13F Shares Held
▲ 906,889 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IBKR largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC security brokers, dealers & flotation companies | 52.86M | 12.06% | 12.06% | $3.64T | Nov 7, 2025 | ▲ 11.05M |
BLACKROCK, INC. security brokers, dealers & flotation companies | 30.97M | 7.06% | 7.06% | $2.13T | Nov 12, 2025 | ▼ 9.27M |
STATE STREET CORP security brokers, dealers & flotation companies | 18.65M | 4.25% | 4.25% | $1.28T | Nov 14, 2025 | ▲ 3.52M |
CANTILLON CAPITAL MANAGEMENT LLC security brokers, dealers & flotation companies | 12.66M | 2.89% | 2.89% | $871.41B | Feb 17, 2026 | ▼ 139.6K |
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC security brokers, dealers & flotation companies | 12.17M | 2.78% | 2.78% | $837.73B | Nov 13, 2025 | ▼ 315.6K |
WELLINGTON MANAGEMENT GROUP LLP security brokers, dealers & flotation companies | 10.90M | 2.49% | 2.49% | $750.11B | Nov 14, 2025 | ▲ 1.63M |
GREENWICH WEALTH MANAGEMENT LLC security brokers, dealers & flotation companies | 10.37M | 2.36% | 2.36% | $713.37B | Nov 12, 2025 | ▼ 497.3K |
GEODE CAPITAL MANAGEMENT, LLC security brokers, dealers & flotation companies | 10.34M | 2.36% | 2.36% | $712.11B | Nov 12, 2025 | ▲ 3.66M |
ORBIS ALLAN GRAY LTD security brokers, dealers & flotation companies | 9.54M | 2.18% | 2.18% | $656.71B | Nov 14, 2025 | ▼ 196.2K |
JPMORGAN CHASE & CO security brokers, dealers & flotation companies | 9.05M | 2.06% | 2.06% | $622.77B | Nov 26, 2025 | ▼ 1.10M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
21
Increased
+31.85M shares0
New Positions
first time holders27
Decreased
−22.88M shares0
Sold Out
fully exitedNet shares change (top 50)
+8.96M
+31.85M / −22.88M
Net new holders
-6
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IBKR insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
3
Buy transactions
6
Sell transactions
0.50
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Conkling Lori A director | Jun 1, 2026 | Purchase | 25 | $86.10 | $2.2K | 2.5K | Form 4 ↗ |
Brody Paul Jonathan Chief Financial Officer | May 8, 2026 | Tax Withhold | 82,920 | $84.42 | $7.00M | 2.86M | Form 4 ↗ |
Mendonca Denis Chief Accounting Officer | May 8, 2026 | Tax Withhold | 11,157 | $84.42 | $941.9K | 145.1K | Form 4 ↗ |
Galik Milan Chief Executive Officer | May 8, 2026 | Tax Withhold | 255,039 | $84.42 | $21.53M | 3.22M | Form 4 ↗ |
Frank Thomas AJ Executive Vice President | May 8, 2026 | Tax Withhold | 31,730 | $84.42 | $2.68M | 251.5K | Form 4 ↗ |
Nemser Earl H Vice Chairman | May 8, 2026 | Tax Withhold | 22,486 | $84.42 | $1.90M | 429.3K | Form 4 ↗ |
Conkling Lori A director | May 1, 2026 | Purchase | 25 | $79.64 | $2.0K | 2.5K | Form 4 ↗ |
Harris Lawrence E director | Apr 28, 2026 | Sale | 26,000 | $76.93 | $2.00M | 173.5K | Form 4 ↗ |
Conkling Lori A director | Apr 1, 2026 | Purchase | 25 | $68.38 | $1.7K | 2.4K | Form 4 ↗ |
Conkling Lori A director | Mar 2, 2026 | Purchase | 25 | $69.21 | $1.7K | 2.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Interactive Brokers Group, Inc. (IBKR) is primarily owned by institutional investors, who hold approximately 85.6% of total shares outstanding. Company insiders own approximately 2.43%, while retail and public investors account for the remaining 11.95%.
The largest institutional shareholder of Interactive Brokers Group, Inc. is VANGUARD GROUP INC, holding approximately 52.86 million shares — equal to 12.06% of outstanding shares — as of September 30, 2025.
A total of 960 institutional investors currently hold IBKR stock, with a combined institutional value of approximately $26.15 billion as of the most recent 13F filing period.
Frequently asked questions
IBKR ownershipInteractive Brokers Group, Inc. (IBKR) is primarily owned by institutional investors, who hold approximately 85.6% of shares. The largest shareholder is VANGUARD GROUP INC with a 12.06% stake. Company insiders hold 2.43%. Data sourced from SEC Form 13F as of September 30, 2025.