SEC Form 4
Interactive Brokers Group, Inc. (IBKR) insider trading
In the 12 months to Oct 24, 2026, 2 IBKR insiders reported open-market sales of $36.5M across 6 filings; 2 insiders bought $46.5K.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $36.5M
- 6 filings · 2 insiders
- Open-market purchases
- $46.5K
- 9 filings
Who traded IBKR, and when
- Purchase
- Sale
IBKR daily close from Oct 24, 2025 to Oct 23, 2026, between $61.05 and $98.19, last $80.28. 6 sale and 9 purchase filings by 4 insiders, marked at their filing dates. Earl H. Nemser, Vice Chairman: sold $30.7M across 2 filings, first filed Jan 26, 2026, last Jan 28, 2026. Lawrence E. Harris, Director: sold $5.8M across 4 filings, first filed Oct 27, 2025, last Apr 29, 2026. Jill Bright, Director: bought $26.4K across 1 filing, first filed Oct 27, 2025, last Oct 27, 2025. Lori A. Conkling, Director: bought $20.1K across 8 filings, first filed Mar 26, 2026, last Oct 5, 2026.
Largest mark · tap a row for others
Earl H. Nemser · Vice Chairman
Filing 1 of 2 within a week · $30,725,593 total
Sale $18,969,682
245,000 shares at $77.43 avg
Filed Jan 26, 2026 · traded Jan 22
Close on filing date $75.35
Earl H. Nemser · Vice Chairman
Vice Chairman
$30.7M soldLawrence E. Harris · Director
Director
$5.8M soldJill Bright · Director
Director
$26.4K boughtLori A. Conkling · Director
Director
$20.1K boughtHas Interactive Brokers Group, Inc.'s CEO sold stock?
No. Milan Galik (CEO) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
15 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Earl H. Nemser | Vice Chairman | $30.7M | — | 2 | — | |
| Lawrence E. Harris | Director | $5.8M | — | 4 | — | |
| Jill Bright | Director | — | $26.4K | 1 | — | |
| Lori A. Conkling | Director | — | $20.1K | 8 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $85.42 | $2.1K | 2,584 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $94.53 | $2.4K | 2,559 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $87.03 | $2.2K | 2,534 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $88.03 | $2.2K | 2,509 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $86.10 | $2.2K | 2,484 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $79.64 | $2.0K | 2,459 | |
traded | Lawrence E. Harris Director | Sale | 26,000 | $76.93 | $2.0M | 173,482 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 25 | $68.38 | $1.7K | 2,434 | |
traded | Lori A. Conkling Director | PurchasePre-arranged (10b5-1) | 75 | $71.88 | $5.4K | 2,409 | |
traded | Earl H. Nemser Vice Chairman | Sale | 155,000 | $75.84 | $11.8M | 0 | |
traded | Earl H. Nemser Vice Chairman | Sale | 245,000 | $77.43 | $19.0M | 215,065 | |
traded | Lawrence E. Harris Director | Sale | 10,645 | $69.00 | $734.5K | 198,704 | |
traded | Lawrence E. Harris Director | Sale | 14,355 | $69.45 | $997.0K | 209,349 | |
traded | Lawrence E. Harris Director | Sale | 30,000 | $67.86 | $2.0M | 223,704 | |
traded | Jill Bright Director | Purchase | 400 | $65.95 | $26.4K | 10,304 |
GET /stocks/filings/vX/form-4?tickers=IBKR&filing_date.gte=2025-10-24&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"IBKR"
],
"issuer_cik": "0001381197",
"owner_cik": "0002067952",
"accession_number": "0001381197-26-000151",
"form_type": "4",
"filing_date": "2026-10-05",
"period_of_report": "2026-10-01",
"issuer_name": "Interactive Brokers Group, Inc.",
"issuer_trading_symbol": "IBKR",
"owner_name": "Conkling Lori A",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A common stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 25,
"transaction_price_per_share": 85.42,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 2584,
"transaction_value": 2135.5,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "This amount includes (a) securities acquired by the Reporting Person; (b) Class A common stock attributable to vested restricted stock units that were awarded under the 2007 Stock Incentive Plan as amended (\"Plan\"); and (c) unvested restricted stock units that were awarded under the Plan."
}
]
},
{
"tickers": [
"IBKR"
],
"issuer_cik": "0001381197",
"owner_cik": "0002067952",
"accession_number": "0001381197-26-000149",
"form_type": "4",
"filing_date": "2026-09-02",
"period_of_report": "2026-09-01",
"issuer_name": "Interactive Brokers Group, Inc.",
"issuer_trading_symbol": "IBKR",
"owner_name": "Conkling Lori A",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A common stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-01",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 25,
"transaction_price_per_share": 94.53,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 2559,
"transaction_value": 2363.25,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "This amount includes (a) securities acquired by the Reporting Person; (b) Class A common stock attributable to vested restricted stock units that were awarded under the 2007 Stock Incentive Plan as amended (\"Plan\"); and (c) unvested restricted stock units that were awarded under the Plan."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 32 records
- Tax withholding5 records
- Grants and awards26 records
- Other1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for IBKR every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.