| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Frank Thomas AJ | Executive Vice President | ONE PICKWICK PLAZA, GREENWICH | /s/ Raymond Bussiere as authorized signatory for Thomas AJ Frank | 07 Jan 2026 | 0001391401 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | IBKR | Class A common stock | Award | $0 | +13,944 | +5.2% | $0.000000 | 283,248 | 31 Dec 2025 | Direct | F1, F2, F3 |
| Id | Content |
|---|---|
| F1 | This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026. |
| F2 | On June 17, 2025, the issuer effected a four-for-one split of its common stock, resulting in the Reporting Person's indirect ownership of 201,978 additional shares of common stock. |
| F3 | This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the Plan and (b) unvested restricted stock units that were awarded under the Plan. |