Companies / Interactive Brokers Group Inc
Interactive Brokers Group Inc
Nasdaq: IBKRCIK 1381197FinancialsGREENWICH, CT
Insider flow · last 90 daysNet buys $2.2K
Financials · FY2025
Ownership
453.1M shares outstanding · as of Aug 5, 2026
Ownership
| Insiders | 1.57% | 7,108,474 |
| 10%+ / strategic | 7.18% | 32,540,281 |
| Institutions | 85.73% | 388,417,566 |
| Public float | 5.52% | 25,011,450 |
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 11
View all →| Insider | % of shares | Shares |
|---|---|---|
Galik MilanCEOChief Executive Officer · Director | 0.71% | 3,215,389 |
Brody Paul JonathanChief Financial Officer · Director | 0.63% | 2,856,806 |
Nemser Earl HVice Chairman · Director | 0.09% | 429,344 |
Frank Thomas AJExecutive Vice President | 0.06% | 251,518 |
Harris Lawrence EDirector | 0.04% | 173,482 |
Mendonca DenisChief Accounting Officer | 0.03% | 145,071 |
Bright JillDirector | <0.01% | 11,082 |
Peterffy WilliamDirector | <0.01% | 10,126 |
Yuen NicoleDirector | <0.01% | 10,126 |
Repetto Richard HDirector | <0.01% | 3,046 |
Institutional holders 989
View all →| Holder | Value | % of shares |
|---|---|---|
| $3.36B | 11.53% | |
| $2.88B | 7.31% | |
| $1.69B | 4.29% | |
| $754.26M | 2.48% | |
| $699.50M | 2.31% | |
| $671.79M | 2.21% | |
| $596.39M | 2.05% | |
| $557.55M | 1.83% | |
| $533.03M | 1.83% | |
| $532.76M | 1.83% |
Activity
Jun 30, 2026View all →
InsidersInstitutions
Who's accumulating and trimming this stock (13F).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q2 2025 as of | Cantillon Capital Management LLC 13F manager | Add | Common stock | $526.94M | +9.5M +288.72% | 12,803,631 2.83% of shares | high |
| Q1 2026 as of | Norges Bank 13F manager | Exit | Common stock | $-453.15M | -7.0M -100.00% | 0 | high |
| Q4 2025 as of | Norges Bank 13F manager | Add | Common stock | $364.22M | +5.7M +409.56% | 7,046,279 1.56% of shares | high |
| Q1 2026 as of | Two Sigma Investments, LP 13F manager | Add | Common stock | $321.01M | +4.8M +135.71% | 8,312,971 1.83% of shares | high |
| Q1 2026 as of | Marshall Wace, LLP 13F manager | Trim | Common stock | $-156.04M | -2.3M -72.61% | 877,766 0.19% of shares | high |
| Q2 2026 as of | BlackRock, Inc. 13F manager | Add | Common stock | $126.19M | +1.4M +4.58% | 33,129,663 7.31% of shares | high |
| Q1 2026 as of | Cantillon Capital Management LLC 13F manager | Trim | Common stock | $-101.55M | -1.5M -11.87% | 11,245,881 2.48% of shares | high |
| Q1 2026 as of | Viking Global Investors LP 13F manager | New | Common stock | $93.52M | +1.4M | 1,394,329 0.31% of shares | high |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Vanguard Group Inc | Passive13G/A | — |
| Vanguard Capital Management | Passive13G | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| IBKR | — | 45841N107 |