Comparable stake leader
VANGUARD CAPITAL MANAGEMENT LLC
SEC ownership of Interactive Brokers Group, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001381197.
Disclosed value leader
VANGUARD CAPITAL MANAGEMENT LLC
Comparable rows
50/50
Latest evidence
01 Jul 2026
- Public ticker
- IBKR on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
VANGUARD CAPITAL MANAGEMENT LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
VANGUARD CAPITAL MANAGEMENT LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
01 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001381197
- Issuer location
- Greenwich, CT
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Interactive Brokers Group, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VANGUARD CAPITAL MANAGEME...
Disclosed value leader
VANGUARD CAPITAL MANAGEME...
Comparable rows
50/50
Latest evidence
01 Jul 2026
13D/G
13F
3/4/5
Lead comparable stake: 7.3%
13D/G row: VANGUARD CAPITAL MANAGEMENT LLC
Showing 1-8 of 50 holder rows.
Quick read
VANGUARD CAPITAL MANAGEMENT LLC leads the comparable SEC ownership view at 7.3%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VANGUARD CAPITAL MANAGEMENT LLC's linked filing trail.
Comparable ownership
Top 5
VANGUARD CAPITAL MANAGEMENT LLC
7.3%
BlackRock, Inc.
6.2%
ORBIS INVESTMENT MANAGEMENT LTD
4.8%
Milan Galik
0.72%
Paul J. Brody
0.64%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
7.3%
|
$2,182,476,647
32,540,281 shares
|
$0 | 31 Mar 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
6.2%
from 13D/G
|
$2,104,323,725
31,375,037 shares
|
— | 31 Mar 2026 |
| ORBIS INVESTMENT MANAGEMENT LTD |
13D/G
|
4.8%
|
$906,513,980
5,277,180 shares
|
$0 | 31 Dec 2024 |
| Milan Galik |
3/4/5
Chief Executive Officer, Director
|
0.72%
|
$215,656,140
3,215,389 shares
|
— | 08 May 2026 |
| Paul J. Brody |
3/4/5
Chief Financial Officer, Director
|
0.64%
|
$191,605,978
2,856,806 shares
|
-$59,126,297 | 08 May 2026 |
| Earl H. Nemser |
3/4/5
Vice Chairman, Director
|
0.1%
|
$28,796,102
429,344 shares
|
-$57,185,586 | 08 May 2026 |
| Thomas Aj Frank |
3/4/5
Executive Vice President
|
0.06%
|
$16,869,312
251,518 shares
|
— | 08 May 2026 |
| Lawrence E. Harris |
3/4/5
Director
|
0.04%
|
$13,345,970
173,482 shares
|
-$5,767,543 | 28 Apr 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$122,039,602.
Buys
$39,824
Insiders: 2
Sells
$122,079,427
Insiders: 3
Net
-$122,039,602
Shares: -1,814,530
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 575
Shares: 1,815,105
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 75 | 26,000 | $6,344 | $2,000,180 | -$1,993,836 |
| 3-6 | 100 | 400,000 | $7,100 | $30,725,593 | -$30,718,493 |
| 6-9 | 400 | 55,000 | $26,380 | $3,767,363 | -$3,740,983 |
| 9-12 | 0 | 1,334,105 | $0 | $85,586,290 | -$85,586,290 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-15 of 15 reporting-owner rows connected to Interactive Brokers Group, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
15
Largest Forms 3/4/5 holder
Thomas Peterffy
Net 12M change
-$122,039,601
Latest report
01 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Thomas Peterffy | Chairman, Director | $332,817,111 | Mixed | 20 Feb 2025 | ||
| Milan Galik | Chief Executive Officer, Director | $215,656,140 | Mixed | 08 May 2026 | ||
| Paul J. Brody | Chief Financial Officer, Director | $191,605,978 | -$59,126,297 | -24% | Mixed | 08 May 2026 |
| Earl H. Nemser | Vice Chairman, Director | $28,796,102 | -$57,185,586 | -67% | Mixed | 08 May 2026 |
| Thomas Aj Frank | Executive Vice President | $16,869,312 | Mixed | 08 May 2026 | ||
| Lawrence E. Harris | Director | $13,345,970 | -$5,767,543 | -30% | Filing P/S | 28 Apr 2026 |
| Denis Mendonca | Chief Accounting Officer | $9,729,911 | Mixed | 08 May 2026 | ||
| Jill Bright | Director | $712,683 | +$26,380 | +3.8% | Mixed | 01 Jan 2026 |
| Nicole Yuen | Director | $651,203 | Mixed | 01 Jan 2026 | ||
| William Peterffy | Director | $651,203 | Mixed | 01 Jan 2026 | ||
| Philip Uhde | Director | $237,293 | Mixed | 31 Dec 2023 | ||
| Lori A. Conkling | Director | $220,867 | +$13,445 | +6.5% | Filing P/S | 01 Jul 2026 |
| John M. Damgard | Director | $201,865 | Mixed | 31 Dec 2021 | ||
| Richard H. Repetto | Director | $195,888 | Mixed | 01 Jan 2026 | ||
| Gary Katz | Director | $177,877 | Mixed | 31 Dec 2022 |
Recent insider transactions for Interactive Brokers Group, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Lori A. Conkling | IBKR | Class A common stock | Purchase | 1.01% | $2,201 | $88.03 | 25 | 2,509 | 01 Jul 2026 | Direct |
| Lori A. Conkling | IBKR | Class A common stock | Purchase | 1.02% | $2,152 | $86.10 | 25 | 2,484 | 01 Jun 2026 | Direct |
| Paul J. Brody | IBKR | Class A common stock | Tax liability | -2.82% | -82,920 | 2,856,806 | 08 May 2026 | Direct | ||
| Denis Mendonca | IBKR | Class A common stock | Tax liability | -7.14% | -11,157 | 145,071 | 08 May 2026 | Direct | ||
| Milan Galik | IBKR | Class A common stock | Tax liability | -7.35% | -255,039 | 3,215,389 | 08 May 2026 | Direct | ||
| Thomas Aj Frank | IBKR | Class A common stock | Tax liability | -11.2% | -31,730 | 251,518 | 08 May 2026 | Direct | ||
| Earl H. Nemser | IBKR | Class A common stock | Tax liability | -4.98% | -22,486 | 429,344 | 08 May 2026 | Direct | ||
| Lori A. Conkling | IBKR | Class A common stock | Purchase | 1.03% | $1,991 | $79.64 | 25 | 2,459 | 01 May 2026 | Direct |
| Lawrence E. Harris | IBKR | Class A common stock | Sale | -13% | $2,000,180 | $76.93 | -26,000 | 173,482 | 28 Apr 2026 | Direct |
| Lori A. Conkling | IBKR | Class A common stock | Purchase | 1.04% | $1,710 | $68.38 | 25 | 2,434 | 01 Apr 2026 | Direct |
| Lori A. Conkling | IBKR | Class A common stock | Purchase | 1.05% | $1,730 | $69.21 | 25 | 2,409 | 02 Mar 2026 | Direct |
| Lori A. Conkling | IBKR | Class A common stock | Purchase | 2.14% | $3,660 | $73.21 | 50 | 2,384 | 25 Feb 2026 | Direct |
| Earl H. Nemser | IBKR | Class A common stock | Sale | -100% | $4,533,133 | $75.30 | -60,200 | 0 | 27 Jan 2026 | by EN Holdings LLC |
| Earl H. Nemser | IBKR | Class A common stock | Sale | -61.2% | $7,222,778 | $76.19 | -94,800 | 60,200 | 26 Jan 2026 | by EN Holdings LLC |
| Earl H. Nemser | IBKR | Class A common stock | Sale | -48.3% | $11,288,682 | $77.85 | -145,000 | 155,000 | 23 Jan 2026 | by EN Holdings LLC |
| Earl H. Nemser | IBKR | Class A common stock | Sale | -25% | $7,681,000 | $76.81 | -100,000 | 300,000 | 22 Jan 2026 | by EN Holdings LLC |
| William Peterffy | IBKR | Class A common stock | Award | 4% | 389 | 10,126 | 01 Jan 2026 | Direct | ||
| Earl H. Nemser | IBKR | Class A common stock | Award | 0.09% | 389 | 451,830 | 01 Jan 2026 | Direct | ||
| Paul J. Brody | IBKR | Class A common stock | Award | 0.01% | 389 | 2,939,726 | 01 Jan 2026 | Direct | ||
| Milan Galik | IBKR | Class A common stock | Award | 0.01% | 389 | 3,470,428 | 01 Jan 2026 | Direct | ||
| Lawrence E. Harris | IBKR | Class A common stock | Award | 0.2% | 389 | 199,482 | 01 Jan 2026 | Direct | ||
| Lori A. Conkling | IBKR | Class A common stock | Award | 20% | 389 | 2,334 | 01 Jan 2026 | Direct | ||
| Jill Bright | IBKR | Class A common stock | Award | 3.64% | 389 | 11,082 | 01 Jan 2026 | Direct | ||
| Nicole Yuen | IBKR | Class A common stock | Award | 4% | 389 | 10,126 | 01 Jan 2026 | Direct | ||
| Richard H. Repetto | IBKR | Class A common stock | Award | 14.6% | 389 | 3,046 | 01 Jan 2026 | Direct | ||
| Lori A. Conkling | IBKR | Class A common stock | Award | 25% | 389 | 1,945 | 31 Dec 2025 | Direct | ||
| Paul J. Brody | IBKR | Class A common stock | Award | 1.87% | 53,841 | 2,939,337 | 31 Dec 2025 | Direct | ||
| Lawrence E. Harris | IBKR | Class A common stock | Award | 0.2% | 389 | 199,093 | 31 Dec 2025 | Direct | ||
| Jill Bright | IBKR | Class A common stock | Award | 3.78% | 389 | 10,693 | 31 Dec 2025 | Direct | ||
| Richard H. Repetto | IBKR | Class A common stock | Award | 17.2% | 389 | 2,657 | 31 Dec 2025 | Direct | ||
| Milan Galik | IBKR | Class A common stock | Award | 6.93% | 225,039 | 3,470,039 | 31 Dec 2025 | Direct | ||
| Earl H. Nemser | IBKR | Class A common stock | Award | 5.52% | 23,629 | 451,441 | 31 Dec 2025 | Direct | ||
| Thomas Aj Frank | IBKR | Class A common stock | Award | 5.18% | 13,944 | 283,248 | 31 Dec 2025 | Direct | ||
| Denis Mendonca | IBKR | Class A common stock | Award | 7.69% | 11,156 | 156,228 | 31 Dec 2025 | Direct | ||
| Lori A. Conkling | IBKR | Class A common stock | Award | 1,556 | 1,556 | 31 Dec 2025 | Direct | |||
| Nicole Yuen | IBKR | Class A common stock | Award | 4.16% | 389 | 9,737 | 31 Dec 2025 | Direct | ||
| William Peterffy | IBKR | Class A common stock | Award | 4.16% | 389 | 9,737 | 31 Dec 2025 | Direct | ||
| Milan Galik | IBKR | Class A common stock | Other | -100% | -895,688 | 0 | 29 Dec 2025 | Immediate Family Member | ||
| Lawrence E. Harris | IBKR | Class A common stock | Sale | -5.08% | $734,505 | $69.00 | -10,645 | 198,704 | 29 Oct 2025 | Direct |
| Lawrence E. Harris | IBKR | Class A common stock | Sale | -3.17% | $474,023 | $69.15 | -6,855 | 209,349 | 28 Oct 2025 | Direct |
| Lawrence E. Harris | IBKR | Class A common stock | Sale | -3.35% | $522,975 | $69.73 | -7,500 | 216,204 | 27 Oct 2025 | Direct |
| Lawrence E. Harris | IBKR | Class A common stock | Sale | -3.45% | $548,000 | $68.50 | -8,000 | 223,704 | 24 Oct 2025 | Direct |
| Jill Bright | IBKR | Class A common stock | Purchase | 4.04% | $26,380 | $65.95 | 400 | 10,304 | 23 Oct 2025 | Direct |
| Lawrence E. Harris | IBKR | Class A common stock | Sale | -8.67% | $1,487,860 | $67.63 | -22,000 | 231,704 | 23 Oct 2025 | Direct |
| Paul J. Brody | IBKR | Class A common stock | Sale | -31.2% | $217,995 | $69.56 | -3,134 | 6,928 | 30 Sep 2025 | by PJB Holdings LLC |
| Paul J. Brody | IBKR | Class A common stock | Sale | -64.4% | $1,236,997 | $67.87 | -18,227 | 10,062 | 29 Sep 2025 | by PJB Holdings LLC |
| Paul J. Brody | IBKR | Class A common stock | Sale | -37.6% | $1,122,041 | $65.78 | -17,058 | 28,289 | 26 Sep 2025 | by PJB Holdings LLC |
| Paul J. Brody | IBKR | Class A common stock | Sale | -24% | $926,513 | $64.81 | -14,296 | 45,347 | 25 Sep 2025 | by PJB Holdings LLC |
| Paul J. Brody | IBKR | Class A common stock | Sale | -19.4% | $932,684 | $64.81 | -14,391 | 59,643 | 24 Sep 2025 | by PJB Holdings LLC |
| Paul J. Brody | IBKR | Class A common stock | Sale | -20.4% | $1,242,273 | $65.30 | -19,025 | 74,034 | 23 Sep 2025 | by PJB Holdings LLC |
* marks a reported price that did not pass the local price check.