Interactive Brokers Group, Inc. (IBKR) - Dilution Analysis

Visualizing historical and potential share dilution over time

Dilution Analysis

Low Risk
Limited dilution potential
Last updated: May 07, 2026

Risk Assessment Details

Potential Dilution: 0.0% of current shares
Recent Dilution: 4.2% (2 years)
Historical Dilution Factor: minimal recent dilution
Outstanding Shares
450M
Potential Supply
0
Additional shares possible
Splits
1 Split
Past 2 years

Summary

IBKR currently has 445M outstanding shares. with minimal authorized share overhang for future dilution. The company has minimally diluted shareholders by 4.2% over the past 2 years. Recent corporate actions include 1 stock split (positive for accessibility).

Share Structure Timeline

Outstanding Shares
Total Supply

Historical Data Points

Date Event Outstanding Supply
May 07, 2026

10-Q filing | 445.4M shares outstanding

450M 0
Nov 05, 2025

10-Q filing | 446.5M shares outstanding

450M 0
Aug 06, 2025

10-Q filing | 441.4M shares outstanding

440M 0
Jul 30, 2025

8-K filing: Interactive Brokers Group, Inc. filed a Prospectus Supplement to take down 3,836,000 shares of the Company's common stock off its shelf Registration Statement on Form S-3.

440M 0
Jun 17, 2025
Stock Split

8-K filing: Stock split 4-for-1 | Outstanding: 109,002,938 → 436,011,752

440M 0
May 08, 2025

10-Q filing | 108.9M shares outstanding

110M 0
Feb 27, 2025

10-K filing | 109.0M shares outstanding

110M 0
Nov 07, 2024

10-Q filing | 108.8M shares outstanding

110M 0
Aug 05, 2024

10-Q filing | 108.6M shares outstanding

110M 0
Jul 25, 2024

8-K filing: Interactive Brokers Group, Inc. filed a Prospectus Supplement under Rule 424(b)(5) to take down 333,000 shares of the Company's common stock off its shelf Registration Statement on Form S-3.

110M 0
May 06, 2024

10-Q filing | 107.1M shares outstanding

110M 0
Feb 27, 2024

10-K filing | 105.8M shares outstanding

110M 0
Nov 06, 2023

10-Q filing | 107.0M shares outstanding

110M 0
Aug 08, 2023

10-Q filing | 104.5M shares outstanding

100M 0
Jul 27, 2023

8-K filing: Interactive Brokers Group, Inc. filed a Prospectus Supplement under Rule 424(b)(5) to take down 2,632,748 shares of the Company's common stock off its shelf Registration Statement on Form S-3.

100M 0
Jul 26, 2023

8-K filing: Interactive Brokers Group, Inc. filed a Prospectus Supplement to register 630,000 shares of the Company's common stock from its shelf Registration Statement.

100M 0
May 08, 2023

10-Q filing | 103.0M shares outstanding

100M 0
Feb 24, 2023

10-K filing | 101.3M shares outstanding

100M 0
Feb 02, 2023

8-K filing: Mr. Thomas Peterffy, founder and Chairman of Interactive Brokers Group, Inc., adopted a Rule 10b5-1 trading plan to sell up to 20,000 shares of the Company's Class A common stock per day until July 29, 2023.

100M 0
Nov 08, 2022

10-Q filing | 102.6M shares outstanding

100M 0
Aug 09, 2022

10-Q filing | 99.7M shares outstanding

100M 0
Aug 02, 2022

8-K filing: Mr. Thomas Peterffy, founder and Chairman Interactive Brokers Group, Inc., adopted a Rule 10b5-1 trading plan to sell 1,000,000 of the Company's Class A common stock received in partial redemption of his interests in IBG Holdings LLC.

98M 0
Aug 01, 2022

8-K filing: Interactive Brokers Group, Inc. completed a takedown of 3,271,390 shares of its common stock from its shelf Registration Statement on Form S-3 filed with the SEC on July 27, 2020.

98M 0
May 09, 2022

10-Q filing | 98.2M shares outstanding

98M 0
Feb 25, 2022

10-K filing | 95.0M shares outstanding

95M 0
Nov 09, 2021

10-Q filing | 97.0M shares outstanding

97M 0
Aug 09, 2021

10-Q filing | 92.2M shares outstanding

92M 0
Aug 03, 2021

8-K filing: Dr. Thomas A.J. Frank, Executive Vice President and Chief Information Officer of Interactive Brokers Group, Inc., adopted a Rule 10b5-1 trading plan to sell 2,000,000 shares of the Company's Class A common stock.

91M 0
Jul 30, 2021

8-K filing: Interactive Brokers Group, Inc. filed a legal opinion letter regarding the validity of 6,079,542 shares of the Company's common stock from its shelf Registration Statement on Form S-3.

91M 0
May 10, 2021

10-Q filing | 90.8M shares outstanding

91M 0
Mar 01, 2021

10-K filing | 90.8M shares outstanding

91M 0
Nov 09, 2020

10-Q filing | 90.8M shares outstanding

91M 0
Nov 03, 2020

8-K filing: On October 30, 2020, Mr. Thomas Peterffy, Chairman and Founder of Interactive Brokers Group, Inc., Paul J. Brody, Chief Financial Officer of the Company, and Dr. Thomas A.J. Frank, Executive Vice President and Chief Information Officer of the Company, each adopted Rule 10b5-1 trading plans to sell shares of the Company's Class A common stock.

78M 0
Oct 30, 2020

8-K filing: Interactive Brokers Group, Inc. completed a takedown of 11,710,608 shares of its common stock from its shelf Registration Statement on Form S-3.

78M 0
Aug 24, 2020

8-K filing: A limited liability company owned by Mr. Earl H. Nemser, Vice Chairman of Interactive Brokers Group, Inc., adopted a Rule 10b5-1 trading plan to sell 1,000,000 shares of IBKR Class A common stock.

78M 0
Aug 20, 2020

8-K filing: Interactive Brokers Group, Inc. completed the takedown of 1,000,000 shares of its common stock from its shelf Registration Statement on Form S-3.

78M 0
Aug 07, 2020

10-Q filing | 78.0M shares outstanding

78M 0
May 11, 2020

10-Q filing | 76.8M shares outstanding

77M 0
Feb 28, 2020

10-K filing | 76.8M shares outstanding

77M 0
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