Interactive Brokers insider activity
What the executives and directors of Interactive Brokers actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.
−$54M
net open-market flow, 12 m
9 open-market buys, 12 m
33%
of sale value on 10b5-1 plans, 12 m
20 days since an insider bought, whole record
The tape: three years of insider trades
Open-market buy
Discretionary sale
Planned sale (10b5-1)
Reported-price path
Routine
Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling.
The 54 routine events on the chart, as a list
| Date | Insider | Shares |
|---|---|---|
| Jul 31, 2026 | Nemser Earl H | 804K |
| May 8, 2026 | Nemser Earl H | 22K |
| May 8, 2026 | Frank Thomas AJ | 32K |
| May 8, 2026 | Brody Paul Jonathan | 83K |
| May 8, 2026 | Galik Milan | 255K |
| May 8, 2026 | Mendonca Denis | 11K |
| Jan 1, 2026 | Nemser Earl H | 24K |
| Jan 1, 2026 | Brody Paul Jonathan | 54K |
| Jan 1, 2026 | Galik Milan | 225K |
| Jan 1, 2026 | Harris Lawrence E | 778 |
| Jan 1, 2026 | Bright Jill | 778 |
| Jan 1, 2026 | Peterffy William | 778 |
| Jan 1, 2026 | Yuen Nicole | 778 |
| Jan 1, 2026 | Repetto Richard H | 778 |
| Jan 1, 2026 | Conkling Lori A | 2,334 |
| Dec 31, 2025 | Frank Thomas AJ | 14K |
| Dec 31, 2025 | Mendonca Denis | 11K |
| Jul 30, 2025 | Nemser Earl H | 400K |
| Jul 30, 2025 | Brody Paul Jonathan | 1.0M |
| Jun 23, 2025 | Nemser Earl H | 500 |
| May 9, 2025 | Nemser Earl H | 5,178 |
| May 9, 2025 | Frank Thomas AJ | 8,212 |
| May 9, 2025 | Brody Paul Jonathan | 22K |
| May 9, 2025 | Galik Milan | 64K |
| May 9, 2025 | Mendonca Denis | 2,467 |
| Feb 20, 2025 | Peterffy Thomas | 97K |
| Dec 31, 2024 | Nemser Earl H | 7,905 |
| Dec 31, 2024 | Frank Thomas AJ | 6,709 |
| Dec 31, 2024 | Brody Paul Jonathan | 18K |
| Dec 31, 2024 | Galik Milan | 293K |
| Dec 31, 2024 | Harris Lawrence E | 142 |
| Dec 31, 2024 | Mendonca Denis | 3,748 |
| Dec 31, 2024 | Bright Jill | 142 |
| Dec 31, 2024 | Peterffy William | 142 |
| Dec 31, 2024 | Yuen Nicole | 142 |
| Dec 31, 2024 | Repetto Richard H | 567 |
| Oct 1, 2024 | Peterffy Thomas | 80K |
| Jul 25, 2024 | Nemser Earl H | 100K |
| May 9, 2024 | Nemser Earl H | 4,419 |
| May 9, 2024 | Frank Thomas AJ | 8,127 |
| May 9, 2024 | Brody Paul Jonathan | 23K |
| May 9, 2024 | Galik Milan | 62K |
| May 9, 2024 | Mendonca Denis | 1,964 |
| Dec 31, 2023 | Nemser Earl H | 15K |
| Dec 31, 2023 | Frank Thomas AJ | 15K |
| Dec 31, 2023 | Brody Paul Jonathan | 39K |
| Dec 31, 2023 | Galik Milan | 136K |
| Dec 31, 2023 | Harris Lawrence E | 302 |
| Dec 31, 2023 | Mendonca Denis | 7,821 |
| Dec 31, 2023 | Bright Jill | 302 |
| Dec 31, 2023 | Uhde Philip | 302 |
| Dec 31, 2023 | Peterffy William | 302 |
| Dec 31, 2023 | Yuen Nicole | 302 |
| Dec 6, 2023 | Nemser Earl H | 800 |
Where the shares went, last 12 months
Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price.
The chart, in numbers
| Flow | Shares |
|---|---|
| From holdings | 917K |
| Granted | 1.1M |
| Bought on market | 625 |
| Withheld for tax | 403K |
| Planned sales (10b5-1) | 276K |
| Discretionary sales | 481K |
| Other out | 896K |
Skin in the game
Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades.
The chart, in numbers
| Insider | Start of the window | Latest reported | Indexed, start = 100 |
|---|---|---|---|
| Peterffy Thomas | 6.1M | 1.5M | 24.7 |
| Frank Thomas AJ | 1.9M | 252K | 13 |
Who holds what
| Insider | Role | Shares held | Buys 12 m | Sales 12 m | 12 m | Last trade |
|---|---|---|---|---|---|---|
| Galik Milan Chief Executive Officer Last trade Sep 17, 2018 | CEO | 3.2M | – | – | Sep 17, 2018 | |
| Brody Paul Jonathan Chief Financial Officer Last trade Sep 30, 2025 | CFO | 2.9M | – | $18M | net selling over the year: 0 months buying, 1 month selling | Sep 30, 2025 |
| Peterffy Thomas Chairman Last trade Jan 27, 2023 | Officer | 1.5M | – | – | Jan 27, 2023 | |
| Nemser Earl H Vice Chairman Last trade Jan 27, 2026 | Officer | 1.2M | – | $31M | net selling over the year: 0 months buying, 1 month selling | Jan 27, 2026 |
| Frank Thomas AJ Executive Vice President Last trade Feb 6, 2024 | Officer | 1.1M | – | – | Feb 6, 2024 | |
| Harris Lawrence E Last trade Apr 28, 2026 | Director | 173K | – | $5.8M | net selling over the year: 0 months buying, 2 months selling | Apr 28, 2026 |
| Mendonca Denis Chief Accounting Officer Last trade Oct 21, 2021 | Officer | 145K | – | – | Oct 21, 2021 | |
| Bright Jill Last trade Oct 23, 2025 | Director | 11K | $26K | – | net buying over the year: 1 month buying, 0 months selling | Oct 23, 2025 |
| Peterffy William | Director | 10K | – | – | – | |
| Yuen Nicole | Director | 10K | – | – | – | |
| Uhde Philip Last trade Apr 20, 2023 | Director | 4,224 | – | – | Apr 20, 2023 | |
| Repetto Richard H | Director | 3,046 | – | – | – | |
| Conkling Lori A Last trade Sep 1, 2026 | Director | 2,559 | $18K | – | net buying over the year: 8 months buying, 0 months selling | Sep 1, 2026 |
Open-market trade log
the 60 most recent of 3,836| Date | Insider | Type | Shares | Price | Value | Since trade | Filed |
|---|---|---|---|---|---|---|---|
| Sep 1, 2026 | Conkling Lori A (Director) 25 shares $94.53 +0.0% since trade filed Sep 2, 2026 | Open-market buy | 25 | $94.53 | $2K | +0.0% | Sep 2, 2026 |
| Aug 3, 2026 | Conkling Lori A (Director) 25 shares $87.03 +8.6% since trade filed Aug 4, 2026 | Open-market buy | 25 | $87.03 | $2K | +8.6% | Aug 4, 2026 |
| Jul 1, 2026 | Conkling Lori A (Director) 25 shares $88.03 +7.4% since trade filed Jul 1, 2026 | Open-market buy | 25 | $88.03 | $2K | +7.4% | Jul 1, 2026 |
| Jun 1, 2026 | Conkling Lori A (Director) 25 shares $86.10 +9.8% since trade filed Jun 2, 2026 | Open-market buy | 25 | $86.10 | $2K | +9.8% | Jun 2, 2026 |
| May 1, 2026 | Conkling Lori A (Director) 25 shares $79.64 +18.7% since trade filed May 4, 2026 | Open-market buy | 25 | $79.64 | $2K | +18.7% | May 4, 2026 |
| Apr 28, 2026 | Harris Lawrence E (Director) 26K shares $76.93 +22.9% since trade filed Apr 29, 2026 | Discretionary sale | 26K | $76.93 | $2.0M | +22.9% | Apr 29, 2026 |
| Apr 1, 2026 | Conkling Lori A (Director) 25 shares $68.38 +38.2% since trade filed Apr 2, 2026 | Open-market buy | 25 | $68.38 | $2K | +38.2% | Apr 2, 2026 |
| Mar 2, 2026 | Conkling Lori A (Director) 25 shares $69.21 +36.6% since trade filed Mar 26, 2026 late | Open-market buy | 25 | $69.21 | $2K | +36.6% | Mar 26, 2026 late |
| Feb 25, 2026 | Conkling Lori A (Director) 50 shares $73.21 +29.1% since trade filed Mar 26, 2026 late | Open-market buy | 50 | $73.21 | $4K | +29.1% | Mar 26, 2026 late |
| Jan 27, 2026 | Nemser Earl H (Officer) 20K shares $75.75 +24.8% since trade filed Jan 28, 2026 | Discretionary sale | 20K | $75.75 | $1.6M | +24.8% | Jan 28, 2026 |
| Jan 27, 2026 | Nemser Earl H (Officer) 40K shares $75.07 +25.9% since trade filed Jan 28, 2026 | Discretionary sale | 40K | $75.07 | $3.0M | +25.9% | Jan 28, 2026 |
| Jan 26, 2026 | Nemser Earl H (Officer) 3,101 shares $77.98 +21.2% since trade filed Jan 28, 2026 | Discretionary sale | 3,101 | $77.98 | $242K | +21.2% | Jan 28, 2026 |
| Jan 26, 2026 | Nemser Earl H (Officer) 31K shares $76.72 +23.2% since trade filed Jan 28, 2026 | Discretionary sale | 31K | $76.72 | $2.4M | +23.2% | Jan 28, 2026 |
| Jan 26, 2026 | Nemser Earl H (Officer) 61K shares $75.83 +24.7% since trade filed Jan 28, 2026 | Discretionary sale | 61K | $75.83 | $4.6M | +24.7% | Jan 28, 2026 |
| Jan 23, 2026 | Nemser Earl H (Officer) 60K shares $78.14 +21.0% since trade filed Jan 26, 2026 | Discretionary sale | 60K | $78.14 | $4.7M | +21.0% | Jan 26, 2026 |
| Jan 23, 2026 | Nemser Earl H (Officer) 85K shares $77.65 +21.7% since trade filed Jan 26, 2026 | Discretionary sale | 85K | $77.65 | $6.6M | +21.7% | Jan 26, 2026 |
| Jan 22, 2026 | Nemser Earl H (Officer) 100K shares $76.81 +23.1% since trade filed Jan 26, 2026 | Discretionary sale | 100K | $76.81 | $7.7M | +23.1% | Jan 26, 2026 |
| Oct 29, 2025 | Harris Lawrence E (Director) 11K shares $69.00 +37.0% since trade filed Oct 31, 2025 | Discretionary sale | 11K | $69.00 | $735K | +37.0% | Oct 31, 2025 |
| Oct 28, 2025 | Harris Lawrence E (Director) 6,855 shares $69.15 +36.7% since trade filed Oct 29, 2025 | Discretionary sale | 6,855 | $69.15 | $474K | +36.7% | Oct 29, 2025 |
| Oct 27, 2025 | Harris Lawrence E (Director) 7,500 shares $69.73 +35.6% since trade filed Oct 29, 2025 | Discretionary sale | 7,500 | $69.73 | $523K | +35.6% | Oct 29, 2025 |
| Oct 24, 2025 | Harris Lawrence E (Director) 8,000 shares $68.50 +38.0% since trade filed Oct 27, 2025 | Discretionary sale | 8,000 | $68.50 | $548K | +38.0% | Oct 27, 2025 |
| Oct 23, 2025 | Harris Lawrence E (Director) 22K shares $67.63 +39.8% since trade filed Oct 27, 2025 | Discretionary sale | 22K | $67.63 | $1.5M | +39.8% | Oct 27, 2025 |
| Oct 23, 2025 | Bright Jill (Director) 400 shares $65.95 +43.3% since trade filed Oct 27, 2025 | Open-market buy | 400 | $65.95 | $26K | +43.3% | Oct 27, 2025 |
| Sep 30, 2025 | Brody Paul Jonathan (CFO) 1,155 shares $70.00 +35.0% since trade filed Oct 1, 2025 | Planned sale (10b5-1) | 1,155 | $70.00 | $81K | +35.0% | Oct 1, 2025 |
| Sep 30, 2025 | Brody Paul Jonathan (CFO) 1,979 shares $69.30 +36.4% since trade filed Oct 1, 2025 | Planned sale (10b5-1) | 1,979 | $69.30 | $137K | +36.4% | Oct 1, 2025 |
| Sep 29, 2025 | Brody Paul Jonathan (CFO) 2,021 shares $68.70 +37.6% since trade filed Oct 1, 2025 | Planned sale (10b5-1) | 2,021 | $68.70 | $139K | +37.6% | Oct 1, 2025 |
| Sep 29, 2025 | Brody Paul Jonathan (CFO) 7,414 shares $67.16 +40.8% since trade filed Oct 1, 2025 | Planned sale (10b5-1) | 7,414 | $67.16 | $498K | +40.8% | Oct 1, 2025 |
| Sep 29, 2025 | Brody Paul Jonathan (CFO) 8,792 shares $68.27 +38.5% since trade filed Oct 1, 2025 | Planned sale (10b5-1) | 8,792 | $68.27 | $600K | +38.5% | Oct 1, 2025 |
| Sep 26, 2025 | Brody Paul Jonathan (CFO) 1,581 shares $66.15 +42.9% since trade filed Sep 29, 2025 | Planned sale (10b5-1) | 1,581 | $66.15 | $105K | +42.9% | Sep 29, 2025 |
| Sep 26, 2025 | Brody Paul Jonathan (CFO) 15K shares $65.74 +43.8% since trade filed Sep 29, 2025 | Planned sale (10b5-1) | 15K | $65.74 | $1.0M | +43.8% | Sep 29, 2025 |
| Sep 25, 2025 | Brody Paul Jonathan (CFO) 1,182 shares $63.81 +48.1% since trade filed Sep 29, 2025 | Planned sale (10b5-1) | 1,182 | $63.81 | $75K | +48.1% | Sep 29, 2025 |
| Sep 25, 2025 | Brody Paul Jonathan (CFO) 4,248 shares $65.19 +45.0% since trade filed Sep 29, 2025 | Planned sale (10b5-1) | 4,248 | $65.19 | $277K | +45.0% | Sep 29, 2025 |
| Sep 25, 2025 | Brody Paul Jonathan (CFO) 8,866 shares $64.76 +46.0% since trade filed Sep 29, 2025 | Planned sale (10b5-1) | 8,866 | $64.76 | $574K | +46.0% | Sep 29, 2025 |
| Sep 24, 2025 | Brody Paul Jonathan (CFO) 927 shares $65.54 +44.2% since trade filed Sep 25, 2025 | Planned sale (10b5-1) | 927 | $65.54 | $61K | +44.2% | Sep 25, 2025 |
| Sep 24, 2025 | Brody Paul Jonathan (CFO) 13K shares $64.76 +46.0% since trade filed Sep 25, 2025 | Planned sale (10b5-1) | 13K | $64.76 | $872K | +46.0% | Sep 25, 2025 |
| Sep 23, 2025 | Brody Paul Jonathan (CFO) 6,227 shares $64.90 +45.7% since trade filed Sep 25, 2025 | Planned sale (10b5-1) | 6,227 | $64.90 | $404K | +45.7% | Sep 25, 2025 |
| Sep 23, 2025 | Brody Paul Jonathan (CFO) 13K shares $65.49 +44.3% since trade filed Sep 25, 2025 | Planned sale (10b5-1) | 13K | $65.49 | $838K | +44.3% | Sep 25, 2025 |
| Sep 22, 2025 | Brody Paul Jonathan (CFO) 563 shares $64.61 +46.3% since trade filed Sep 23, 2025 | Planned sale (10b5-1) | 563 | $64.61 | $36K | +46.3% | Sep 23, 2025 |
| Sep 22, 2025 | Brody Paul Jonathan (CFO) 15K shares $63.94 +47.8% since trade filed Sep 23, 2025 | Planned sale (10b5-1) | 15K | $63.94 | $936K | +47.8% | Sep 23, 2025 |
| Sep 19, 2025 | Brody Paul Jonathan (CFO) 140 shares $65.19 +45.0% since trade filed Sep 23, 2025 | Planned sale (10b5-1) | 140 | $65.19 | $9K | +45.0% | Sep 23, 2025 |
| Sep 19, 2025 | Brody Paul Jonathan (CFO) 6,928 shares $64.66 +46.2% since trade filed Oct 3, 2025 late | Planned sale (10b5-1) | 6,928 | $64.66 | $448K | +46.2% | Oct 3, 2025 late |
| Sep 19, 2025 | Brody Paul Jonathan (CFO) 51K shares $64.61 +46.3% since trade filed Sep 23, 2025 | Planned sale (10b5-1) | 51K | $64.61 | $3.3M | +46.3% | Sep 23, 2025 |
| Sep 18, 2025 | Brody Paul Jonathan (CFO) 7,937 shares $63.43 +49.0% since trade filed Sep 19, 2025 | Planned sale (10b5-1) | 7,937 | $63.43 | $503K | +49.0% | Sep 19, 2025 |
| Sep 18, 2025 | Brody Paul Jonathan (CFO) 38K shares $64.40 +46.8% since trade filed Sep 19, 2025 | Planned sale (10b5-1) | 38K | $64.40 | $2.4M | +46.8% | Sep 19, 2025 |
| Sep 18, 2025 | Brody Paul Jonathan (CFO) 71K shares $65.05 +45.3% since trade filed Sep 19, 2025 | Planned sale (10b5-1) | 71K | $65.05 | $4.6M | +45.3% | Sep 19, 2025 |
| Sep 17, 2025 | Brody Paul Jonathan (CFO) 45K shares $62.48 +51.3% since trade filed Sep 19, 2025 | Planned sale (10b5-1) | 45K | $62.48 | $2.8M | +51.3% | Sep 19, 2025 |
| Sep 17, 2025 | Brody Paul Jonathan (CFO) 62K shares $62.06 +52.3% since trade filed Sep 19, 2025 | Planned sale (10b5-1) | 62K | $62.06 | $3.8M | +52.3% | Sep 19, 2025 |
| Sep 16, 2025 | Brody Paul Jonathan (CFO) 587 shares $62.62 +51.0% since trade filed Sep 17, 2025 | Planned sale (10b5-1) | 587 | $62.62 | $37K | +51.0% | Sep 17, 2025 |
| Sep 16, 2025 | Brody Paul Jonathan (CFO) 99K shares $62.24 +51.9% since trade filed Sep 17, 2025 | Planned sale (10b5-1) | 99K | $62.24 | $6.1M | +51.9% | Sep 17, 2025 |
| Sep 15, 2025 | Brody Paul Jonathan (CFO) 1,499 shares $64.26 +47.1% since trade filed Sep 17, 2025 | Planned sale (10b5-1) | 1,499 | $64.26 | $96K | +47.1% | Sep 17, 2025 |
| Sep 15, 2025 | Brody Paul Jonathan (CFO) 38K shares $63.79 +48.2% since trade filed Sep 17, 2025 | Planned sale (10b5-1) | 38K | $63.79 | $2.4M | +48.2% | Sep 17, 2025 |
| Sep 15, 2025 | Brody Paul Jonathan (CFO) 57K shares $62.66 +50.9% since trade filed Sep 17, 2025 | Planned sale (10b5-1) | 57K | $62.66 | $3.6M | +50.9% | Sep 17, 2025 |
| Sep 12, 2025 | Brody Paul Jonathan (CFO) 36K shares $63.84 +48.1% since trade filed Sep 15, 2025 | Planned sale (10b5-1) | 36K | $63.84 | $2.3M | +48.1% | Sep 15, 2025 |
| Sep 12, 2025 | Brody Paul Jonathan (CFO) 62K shares $64.19 +47.3% since trade filed Sep 15, 2025 | Planned sale (10b5-1) | 62K | $64.19 | $4.0M | +47.3% | Sep 15, 2025 |
| Sep 11, 2025 | Brody Paul Jonathan (CFO) 55K shares $63.54 +48.8% since trade filed Sep 15, 2025 | Planned sale (10b5-1) | 55K | $63.54 | $3.5M | +48.8% | Sep 15, 2025 |
| Sep 11, 2025 | Brody Paul Jonathan (CFO) 58K shares $62.94 +50.2% since trade filed Sep 15, 2025 | Planned sale (10b5-1) | 58K | $62.94 | $3.6M | +50.2% | Sep 15, 2025 |
| Sep 10, 2025 | Brody Paul Jonathan (CFO) 105K shares $62.51 +51.2% since trade filed Sep 11, 2025 | Planned sale (10b5-1) | 105K | $62.51 | $6.6M | +51.2% | Sep 11, 2025 |
| Sep 9, 2025 | Brody Paul Jonathan (CFO) 23K shares $61.30 +54.2% since trade filed Sep 11, 2025 | Planned sale (10b5-1) | 23K | $61.30 | $1.4M | +54.2% | Sep 11, 2025 |
| Sep 9, 2025 | Brody Paul Jonathan (CFO) 85K shares $62.02 +52.4% since trade filed Sep 11, 2025 | Planned sale (10b5-1) | 85K | $62.02 | $5.3M | +52.4% | Sep 11, 2025 |
| Aug 14, 2025 | Nemser Earl H (Officer) 21K shares $64.22 +47.2% since trade filed Aug 15, 2025 | Planned sale (10b5-1) | 21K | $64.22 | $1.3M | +47.2% | Aug 15, 2025 |
“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles.
Filing hygiene
151 Forms 4, 3 years
56 filed late
2 amendments
4.9 avg. days to file
How to read this
A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.
Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.