=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-01-26
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: Interactive Brokers Group, Inc. (IBKR)
CIK: 0001381197
--- Reporting Owner ---
Name: Nemser Earl H
CIK: 0001391400
Role: Director, Officer (Vice Chairman)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Class A common stock
Date: 2026-01-26 | Code: S (Open market sale)
Shares: -60,882 | Price: $75.83
Total Value: $4,616,682.06
Shares Owned After: 94,118 | Ownership: I (Indirect) | Nature: by EN Holdings LLC
Footnotes:
[F2] 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.
[Transaction #2]
Security: Class A common stock
Date: 2026-01-26 | Code: S (Open market sale)
Shares: -30,817 | Price: $76.72
Total Value: $2,364,280.24
Shares Owned After: 63,301 | Ownership: I (Indirect) | Nature: by EN Holdings LLC
Footnotes:
[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.
[F1] Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.
[Transaction #3]
Security: Class A common stock
Date: 2026-01-26 | Code: S (Open market sale)
Shares: -3,101 | Price: $77.98
Total Value: $241,815.98
Shares Owned After: 60,200 | Ownership: I (Indirect) | Nature: by EN Holdings LLC
Footnotes:
[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.
[F1] Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.
[Transaction #4]
Security: Class A common stock
Date: 2026-01-27 | Code: S (Open market sale)
Shares: -39,731 | Price: $75.07
Total Value: $2,982,606.17
Shares Owned After: 20,469 | Ownership: I (Indirect) | Nature: by EN Holdings LLC
Footnotes:
[F5] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $74.55 to $75.54.
[F1] Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.
[Transaction #5]
Security: Class A common stock
Date: 2026-01-27 | Code: S (Open market sale)
Shares: -20,469 | Price: $75.75
Total Value: $1,550,526.75
Shares Owned After: 0 | Ownership: I (Indirect) | Nature: by EN Holdings LLC
Footnotes:
[F6] The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.55 to $75.99.
[F1] Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.
--- Holdings ---
[Holding #1]
Security: Class A common stock
Ownership: D (Direct)
Footnotes:
[F7] This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the amended 2007 Stock Incentive Plan ("Plan") and (b) unvested restricted stock units that were awarded under the Plan.
--- Footnotes (Complete Index) ---
F1: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.
F2: 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.
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.
F5: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $74.55 to $75.54.
F6: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.55 to $75.99.
F7: This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the amended 2007 Stock Incentive Plan ("Plan") and (b) unvested restricted stock units that were awarded under the Plan.
--- Signature ---
/s/ /s/ Raymond Bussiere as authorized signatory for Earl H Nemser (2026-01-28)
