---
schema_version: "secwatch.filing_event.v1"
accession: "0001381197-26-000130"
form_type: "8-K"
ticker: "IBKR"
cik: "0001381197"
company_name: "Interactive Brokers Group, Inc."
filed_at: "2026-07-31T17:02:54+00:00"
generated_at: "2026-07-31T17:04:12.610893+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "medium"
source: SEC EDGAR
---

# Interactive Brokers files prospectus supplement to sell 2,499,567 shares of common stock

## Summary
- Company filed a Prospectus Supplement under Rule 424(b)(5) to take down 2,499,567 shares off its shelf registration.
- Shares are offered under Registration Statement No. 333-297857 filed July 31, 2026.
- Legal opinion of Dechert LLP regarding share validity filed as Exhibit 5.2.
- No offering price or use of proceeds disclosed in the 8-K.

## SEC filing metadata
- accession: 0001381197-26-000130
- form_type: 8-K
- ticker: IBKR
- cik: 0001381197
- company_name: Interactive Brokers Group, Inc.
- filed_at: 2026-07-31T17:02:54+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: medium
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1381197/000138119726000130/0001381197-26-000130-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1381197/000138119726000130/ibkr-20260731.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001381197-26-000130
- JSON: https://secwatch.observer/filing/0001381197-26-000130.json
- Plain text: https://secwatch.observer/filing/0001381197-26-000130.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.