Interactive Brokers (IBKR) 10-K/A 4 Mar 25 2024 FY Annual report (amended) Financial data

Documentation and Entity Inform

Documentation and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 21, 2025	Jun. 28, 2024
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	001-33440
Entity Registrant Name	INTERACTIVE BROKERS GROUP, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	30-0390693
Entity Address, Address Line One	One Pickwick Plaza
Entity Address, City or Town	Greenwich
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06830
City Area Code	203
Local Phone Number	618-5800
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	IBKR
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 12,885,708,490
Current Fiscal Year End Date	--12-31
Fiscal Period Focus	FY
Fiscal Year Focus	2024
Entity Central Index Key	0001381197
Amendment Flag	true
Documents Incorporated by Reference [Text Block]	Documents Incorporated by Reference: Portions of Registrant’s definitive proxy statement for its 2025 annual meeting of shareholders are incorporated by reference in Part III of this Form 10 - K.
Amendment Description	Explanatory NoteThis Amendment No. 1 (this "Amendment") to the Annual Report on Form 10-K filed on February 27, 2025 (the “Original Annual Report”) of Interactive Brokers Group, Inc. (the “Company”) is being filed solely for the purpose of correcting the inadvertent omissions of a 10b5-1 trading plan adopted by one of the Company’s named executive officers and a modification of an existing 10b5-1 trading plan of another named executive officer, of the Company, under the caption “Item 9B. Other Information” on page 113 of the Form 10-K by amending only the data appearing in Part II, Item 9B. “Other Information” in the Original Annual Report. Except as described above, no other changes have been made to the Original Annual Report. We have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the Original Annual Report. The Company has included as exhibits to this Amendment updated certifications from the Company’s Principal Executive Officer and Principal Financial Officer pursuant to Sections 302 and 906 of the Sarbanes Oxley
Common Class A [Member]
Common Stock Shares Outstanding		108,931,614
Common Class B [Member]
Common Stock Shares Outstanding		100

Insider Trading Arrangements (D

Insider Trading Arrangements (Details)	3 Months Ended
	Dec. 31, 2024 shares
Insider Trading Arrangements [Line Items]
Material Terms of Trading Arrangement [Text Block]	Rule 10b5-1 Trading Plans The following table discloses the adoption of Rule 10b5-1 trading plans for the sale of shares of our common stock by our directors and officers (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended) during the three months ended December 31, 2024, each of which is intended to satisfy the affirmative defense conditions of Rule 10b-51(c) under the Exchange Act. Name Title Plan Adoption and/or Termination Plan Adoption Date Plan Expiration Date (1) Purchase or Sale Aggregate Number of IBKR shares to be Sold Thomas Peterffy Chairman of the Board of Directors Adoption October 31, 2024 June 2, 2025 Sale 1,612,926 (2) ________________________ (1) Or upon the earlier completion of all authorized transactions under the plan. (2) Shares held through Conyers Investments LLC, which is indirectly wholly owned by Thomas Peterffy. Mr. Peterffy is also a manager of Conyers Investments LLC with the unilateral power to vote or sell the shares. Mr. Earl Nemser, the Company’s Vice Chairman, modified his 10b5-1 plan adopted on August 20, 2024 to extend the expiration date to August 31, 2025. Other than as disclosed above, no other director or officer adopted, modified or terminated a contract, instruction or written plan for the purchase or sale of our securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a “ non-Rule 10b5-1 trading arrangement”, as defined in Item 408(c) of Regulation S-K.
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false
Thomas Peterffy [Member]
Insider Trading Arrangements [Line Items]
Trading Arrangement, Individual Name	Thomas Peterffy
Trading Arrangement, Individual Title	Chairman of the Board of Directors
Rule 10b5-1 Arrangement Adopted [Flag]	true
Trading Arrangement, Securities Aggregate Available Amount	1,612,926
Trading Arrangement Adoption Date	October 31, 2024