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ROCKWOOD RESEARCH · A CORPORATE FILINGS WEBSITE|STRAIGHT FROM THE SOURCE · SEC EDGAR|SPONSOREDYour message on this tape — bid on the Rockwood Ad Exchange · Rockwood Ad Exchange|

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IBKR

Interactive Brokers Group, Inc.

Security Brokers, Dealers & Flotation Companies · SIC 6211CIK 1381197Held by 16 tracked managersEDGAR filings ↗10-K/10-Q ↗

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14 of 14 reported changes in each tracked manager’s latest 13F vs its prior quarter (2 reporting periods). Every change is listed — no cap.

ManagerActionShare change% chgEnding % of 13F bookPosition size

Lone Pine Capital

Q2 2026Position history →

New+577,666—0.31%$50.3M

Viking Global Investors

Q2 2026Position history →

Add+3,436,419+246.5%1.2%$420.5M

Capital World Investors

Q2 2026Position history →

Add+224,492+7.4%0.03%$283.4M

Holocene Advisors

Q2 2026Position history →

Add+259,929+1392.8%0.06%$24.2M

Motley Fool Asset Management

Q2 2026Position history →

Add+26,572+349.0%0.11%$3.0M

WCM Investment Management

Q2 2026Position history →

Add+382+4.3%<0.01%$0.8M

Orbis Investment Management

Q2 2026Position history →

Trim(48,775)(0.8%)1.8%$528.3M

Egerton Capital

Q2 2026Position history →

Trim(2,145,763)(34.2%)3.5%$359.4M

Bares Capital Management

Q3 2025Position history →

Trim(950,511)(31.6%)13.1%$141.8M

Q2 2026Position history →

Trim(196,833)(26.0%)12.8%$48.8M

Cantillon Capital Management

Q2 2026Position history →

Trim(10,728,048)(95.4%)6.8%$45.1M

Adage Capital Management

Q2 2026Position history →

Trim(2,000)(0.5%)0.05%$34.6M

Soros Fund Management

Q2 2026Position history →

Trim(493,874)(76.5%)0.17%$13.2M

Bridgewater Associates

Q2 2026Position history →

Trim(30,261)(41.8%)0.02%$3.7M

Changes compare each manager’s latest 13F with its prior quarter for the same CUSIP. “First observation” rows have no earlier stored filing to compare and are never counted as buys; “Split?” rows moved by a near-whole factor at an unchanged value and are treated as stock splits, not trades. Ending weight is the position after the change, not the size of the change.