Interactive Brokers (IBKR) insider buying and selling
Every Table I transaction reported by directors and officers of S&P 500 companies on SEC Form 4 filings (2 business days to file): each row labeled with its official transaction code, nothing filtered out beforehand.
Open-market purchases (code P) are the rare signal, in green; sales (code S) are common and often pre-scheduled (10b5-1). Table II (derivatives) is not included: its prices are exercise prices, not market values. Guide: insider buying.
| Date | Ticker | Insider | Role | Shares | Price | Amount | % of stake | Type / filing |
|---|
Download these transactions as CSV No account, no sign-up. The data is public: it comes from SEC Form 4 filings.
Interactive Brokers Group, Inc. (IBKR) insider buying and selling: 10 purchases, 26 sales
64 Form 4 Table I transactions filed with the SEC by Interactive Brokers Group, Inc. insiders between 2025-09-11 and 2026-10-05 (15-month history): 10 open-market purchases and 26 sales, plus 28 transactions under other Form 4 codes, broken down one by one below. The largest open-market trade is a sale of $11.3M by Nemser Earl H on 2026-01-23.
Interactive Brokers insider buying and selling over the last 12 months
Between Oct 21, 2025 and Oct 20, 2026, Interactive Brokers insiders filed 10 purchases worth $46k and 10 sales worth $36.5M on the open market. The net balance is on the sell side: $36.4M more sold than bought.
The biggest buyer was Bright Jill (Director): $26k in 1 purchase, out of 2 different buyers. The biggest seller was Nemser Earl H (Vice Chairman): $30.7M in 4 sales, out of 2 different sellers.
The largest trade of the period was a sale of $11.3M on Jan 23, 2026, by Nemser Earl H (Vice Chairman). Form 4 on sec.gov (0001381197-26-000056).
None of the 10 sales carries the 10b5-1 plan flag on the Form 4 (sales scheduled months ahead). 9 of the 10 purchases were also scheduled under a 10b5-1 plan.
The last three months show 3 purchases and 0 sales, against 3 and 1 in the three before. The latest purchase is from Oct 1, 2026; the latest sale from Apr 28, 2026.
Against its sector (Financial Services, 70 companies with an insider page on this site), over the same dates the median is 10 sales and 0 purchases on the open market. Interactive Brokers has more sales than 34 of the other 69, ranks 24 of 70 by net dollars sold, and 32 of the 70 have at least one purchase, Interactive Brokers included.
The 20 most important trades
The 10 open-market purchases first, then the rest, each type from largest to smallest. The full history is in the tool above, already searched.
See all 64 IBKR trades in the full history →
| Trade date | Filed | Insider | Role | Amount | Code | Filing |
|---|---|---|---|---|---|---|
| 2025-10-23 | 2025-10-27 | Bright Jill | Director | $26k | P — Open-market purchase2 Form 4 footnotesF1 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 the ("Plan"); and (c) unvested restricted stock units that were awarded under the Plan. F2 On June 17, 2025, the Issuer effected a four-for-one split of its common stock, resulting in the reporting person's ownership of 7,428 additional shares of common stock. | SEC |
| 2026-02-25 | 2026-03-26 | Conkling Lori A | Director | $4k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-09-01 | 2026-09-02 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-07-01 | 2026-07-01 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-08-03 | 2026-08-04 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-06-01 | 2026-06-02 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-10-01 | 2026-10-05 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-05-01 | 2026-05-04 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-03-02 | 2026-03-26 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-04-01 | 2026-04-02 | Conkling Lori A | Director | $2k | P — Open-market purchase (scheduled 10b5-1)Form 4 footnoteF1 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. | SEC |
| 2026-01-23 | 2026-01-26 | Nemser Earl H | Vice Chairman | $11.3M | S — Open-market sale Indirect holding, through: by EN Holdings LLC 3 Form 4 footnotesF3 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.02 to $78.01. F1 Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates. F4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $78.02 to $78.44. | SEC |
| 2026-01-22 | 2026-01-26 | Nemser Earl H | Vice Chairman | $7.7M | S — Open-market sale Indirect holding, through: by EN Holdings LLC 2 Form 4 footnotesF2 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.45 to $77.34. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4. F1 Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates. | SEC |
| 2025-09-18 | 2025-09-19 | Brody Paul Jonathan | Chief Financial Officer | $7.6M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 4 Form 4 footnotesF4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.78 to $63.77. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. F5 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.78 to $64.77. F6 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.78 to $65.54. | SEC |
| 2026-01-26 | 2026-01-28 | Nemser Earl H | Vice Chairman | $7.2M | S — Open-market sale Indirect holding, through: by EN Holdings LLC 4 Form 4 footnotesF2 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.46 to $76.45. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4. F1 Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates. F3 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.46 to $77.45. F4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.46 to $78.41. | SEC |
| 2025-09-11 | 2025-09-15 | Brody Paul Jonathan | Chief Financial Officer | $7.1M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 3 Form 4 footnotesF2 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.29 to $63.28. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (5) to this Form 4. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. F3 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.29 to $63.79 | SEC |
| 2025-09-09 | 2025-09-11 | Brody Paul Jonathan | Chief Financial Officer | $6.7M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 3 Form 4 footnotesF2 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.68 to $61.67. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. F3 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.68 to $62.42. | SEC |
| 2025-09-17 | 2025-09-19 | Brody Paul Jonathan | Chief Financial Officer | $6.6M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 3 Form 4 footnotesF2 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.28 to $62.27. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (6) to this Form 4. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. F3 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.28 to $63.09. | SEC |
| 2025-09-10 | 2025-09-11 | Brody Paul Jonathan | Chief Financial Officer | $6.6M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 2 Form 4 footnotesF4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.01 to $62.92. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. | SEC |
| 2025-09-12 | 2025-09-15 | Brody Paul Jonathan | Chief Financial Officer | $6.2M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 3 Form 4 footnotesF4 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.03 to $64.02. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. F5 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.03 to $64.42. | SEC |
| 2025-09-16 | 2025-09-17 | Brody Paul Jonathan | Chief Financial Officer | $6.2M | S — Open-market sale (scheduled 10b5-1) Indirect holding, through: by PJB Holdings LLC 3 Form 4 footnotesF5 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.61 to $62.60. F1 Represents number of securities acquired by a limited liability company, owned indirectly by the Reporting Person, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interest in IBG LLC. F6 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.61 to $62.68. | SEC |
The period balance: money in, money out
Across the Form 4 filings submitted between Sep 11, 2025 and Oct 5, 2026, Interactive Brokers Group, Inc. open-market activity adds up to 10 purchases worth $46k and 26 sales worth $99.4M. The net balance is $99.4M on the sell side.
Only codes P and S count, where an insider puts in or takes out their own money. A selling balance like Interactive Brokers Group, Inc.'s is the norm in the S&P 500, where much of the pay comes as stock. It is not a recommendation to buy or sell: it is what was filed.
Every transaction, code by code
| Code | What it means | Trades | Reported amount |
|---|---|---|---|
| S | Open-market sale | 26 | $99.4M |
| A | Grant or award | 22 | $71.2M |
| P | Open-market purchase | 10 | $46k |
| F | Tax withholding (shares surrendered for taxes) | 5 | $34.0M |
| J | Other transaction (explained in the filing) | 1 | $0 |
| Total | Everything filed in the period | 64 | $204.7M |
4 of the 64 rows carry no usable amount on the Form 4: they count as trades and add $0. The code labels come from the SEC index.
Who has traded
Over the 15 months of history, 11 distinct people or entities have filed Interactive Brokers Group, Inc. transactions: 2 bought on the open market and 3 sold. Counted by CIK, the fixed number the SEC gives each filer, and not by name, which each filer types their own way.
| Filer | Role | Transactions | Bought (count) | Sold (count) | Last filed |
|---|---|---|---|---|---|
| Brody Paul Jonathan | Chief Financial Officer | 19 | — | $62.9M (16) | 2026-05-28 |
| Nemser Earl H | Vice Chairman | 8 | — | $30.7M (4) | 2026-08-04 |
| Harris Lawrence E | Director | 8 | — | $5.8M (6) | 2026-04-29 |
| Bright Jill | Director | 3 | $26k (1) | — | 2026-01-26 |
| Conkling Lori A | Director | 12 | $20k (9) | — | 2026-10-05 |
| Galik Milan | Chief Executive Officer | 4 | — | — | 2026-05-28 |
| Frank Thomas Aj | Executive Vice President | 2 | — | — | 2026-05-28 |
| Mendonca Denis | Chief Accounting Officer | 2 | — | — | 2026-05-28 |
Shown here are the 8 who moved the most money, out of 11. The rest are in the full history, one link above. The name links to all their trades, in any company. "Transactions" counts any code; the money, open market only. Role: from their latest filing.
Month by month
By the month the trade was executed, not the month it was filed; months with no trades show zero. The busiest month was Sep 2025: 0 purchases and 16 sales, worth $62.9M. 3 of the 15 months have none.
| Month | Purchases | Amount | Sales | Amount |
|---|---|---|---|---|
| Aug 2025 | 0 | $0 | 0 | $0 |
| Sep 2025 | 0 | $0 | 16 | $62.9M |
| Oct 2025 | 1 | $26k | 5 | $3.8M |
| Nov 2025 | 0 | $0 | 0 | $0 |
| Dec 2025 | 0 | $0 | 0 | $0 |
| Jan 2026 | 0 | $0 | 4 | $30.7M |
| Feb 2026 | 1 | $4k | 0 | $0 |
| Mar 2026 | 1 | $2k | 0 | $0 |
| Apr 2026 | 1 | $2k | 1 | $2.0M |
| May 2026 | 1 | $2k | 0 | $0 |
| Jun 2026 | 1 | $2k | 0 | $0 |
| Jul 2026 | 1 | $2k | 0 | $0 |
| Aug 2026 | 1 | $2k | 0 | $0 |
| Sep 2026 | 1 | $2k | 0 | $0 |
| Oct 2026 | 1 | $2k | 0 | $0 |
The last month may be partial: a Form 4 is filed up to two business days later. The table does not say whether the pattern is good or bad; it says when it happened.
Interactive Brokers Group, Inc. (IBKR) analysis page →
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How to read this data
7 of the 10 sales in the table are flagged as scheduled (10b5-1 plan): signed months ahead and executed automatically, so they say nothing about what the insider thinks today. Interactive Brokers's 10 open-market purchases (code P) are the rare signal: insiders are already paid in stock, so buying more means putting in their own money. The latest filing is from Oct 5, 2026, and a Form 4 arrives up to two business days after the trade.
20 of the 20 rows in the table carry footnotes from the Form 4 itself, folded into the code column and copied verbatim; a row with no footnote means the filing has none.
Guide: Insider buying · all guides
What is behind these trades
The concepts on this page, explained from scratch in the Academy. Free, no account.
- What the efficiency hypothesis says and what it does NOT sayIf an insider's purchase is public and anyone can read it, is there any information left in it? That is the exact question that brings people here.
- Who really moves the market: the types of investorWho sits on the other side of each order, and where a company's own insiders fit among them.
- Supply, demand and price: why it rises and falls constantlyHow a piece of news ends up inside the price, and why the reaction to a filed sale is rarely the one you would expect.
Source: SEC EDGAR Form 4. This is a list of public facts, not financial advice or a recommendation to buy or sell.