# INTERACTIVE BROKERS GROUP IN (IBKR) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 45841N107
Page URL: https://superinvestorclub.com/stock/IBKR
Last updated: 2026-08-29T13:46:57.502Z

## Summary

As of the most recent 13F filing period, INTERACTIVE BROKERS GROUP IN (IBKR) is held by 7 tracked superinvestors with an aggregate position value of $1.73B representing 01124588148307484129416103074057766656108642076 shares.

## Top institutional holders (7)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [William Von Mueffling](https://superinvestorclub.com/manager/2284) | Cantillon Capital Management | 11245881 | $754.3M | 5.01% | 2026-03-31 |
| 2 | [Andreas Halvorsen](https://superinvestorclub.com/manager/59) | Viking Global Investors | 4830748 | $420.5M | 1.20% | 2026-06-30 |
| 3 | [John Armitage](https://superinvestorclub.com/manager/66) | Egerton Capital | 4129416 | $359.4M | 3.47% | 2026-06-30 |
| 4 | [Bryan Lawrence](https://superinvestorclub.com/manager/39) | Oakcliff Capital Partners | 1030740 | $89.7M | 33.42% | 2026-06-30 |
| 5 | [Stephen Mandel](https://superinvestorclub.com/manager/61) | Lone Pine Capital | 577666 | $50.3M | 0.31% | 2026-06-30 |
| 6 | [Robert Vinall](https://superinvestorclub.com/manager/3221) | RV Capital GmbH | 561086 | $48.8M | 12.75% | 2026-06-30 |
| 7 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 42076 | $3.7M | 0.02% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2024-03-31: 2 holders, $349.2M aggregate, 02823697302647 shares
- 2024-06-30: 3 holders, $423.8M aggregate, 0313337030264720596 shares
- 2024-09-30: 4 holders, $561.4M aggregate, 0338251331554730264727546 shares
- 2024-12-31: 3 holders, $419.6M aggregate, 01848173299685224347 shares
- 2025-03-31: 5 holders, $934.6M aggregate, 03293826183396925768521248046304 shares
- 2025-06-30: 4 holders, $1.26B aggregate, 01280363180568441030740849920 shares
- 2025-09-30: 5 holders, $1.47B aggregate, 01266402662541341030740799267582770 shares
- 2025-12-31: 5 holders, $1.41B aggregate, 01275990469395811030740752478488940 shares
- 2026-03-31: 6 holders, $1.39B aggregate, 01124588162751791394329103074075791972337 shares
- 2026-06-30: 6 holders, $972.4M aggregate, 048307484129416103074057766656108642076 shares

## Recent congressional trades (5)

- 2025-10-14: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-08-13: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2025-06-24: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-06-17: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2024-11-13: Morgan McGarvey (Democrat-KY) sale $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "INTERACTIVE BROKERS GROUP IN (IBKR) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/IBKR), aggregating SEC 13F, Form 4, and congressional disclosures."