Interactive Brokers Gro-cl A (IBKR) — 13F Filings Explorer (Q2 2026)

IBKR ranks #398 out of 37501 tracked stocks by institutional interest — one of the most closely watched names in our coverage.

IBKR is a top-conviction position for Greenwich Wealth Management LLC — at 31.5% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.

The largest dollar stake in IBKR belongs to BlackRock, Inc., but the position matters far more to Greenwich Wealth Management LLC, who has 31.5% of their own portfolio riding on it — a reminder that the biggest holder by size and the holder with the biggest bet aren't always the same fund.

BlackRock has added to its IBKR position for two straight quarters, increasing it by $846.3M to reach $2.9B today.

Cantillon Capital Management LLC has trimmed its IBKR position for two straight quarters, cutting it by $775.5M while still holding $45.1M.

IBKR is down 7% today, but institutions show net buying of $5.1B this quarter — a divergence between today's price move and the underlying institutional flow.

IBKR posted net income of $4.9B over the trailing twelve months, and currently trades at a P/E of 8.2.

• Profitable — net income of $4.9B over the trailing twelve months
• Revenue grew 22.1% year over year
• Net income improved year over year, from $3.8B to $4.9B
• Generated $15.8B in positive operating cash flow
• Liabilities run 34.08x equity — a highly leveraged balance sheet worth noting