INTERACTIVE BROKERS GROUP IN

Ticker: IBKR CUSIP: 45841N107 Class: EQTY

Mainstream Capital Management LLC's Holding History (CIK: 0002043084)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 21,552 Value ($000) $1,386 Avg Close $66.89 Range $58.88 - $73.26

Q3 2025

Shares 19,381 Value ($000) $1,334 Avg Close $62.79 Range $53.01 - $70.18

Q2 2025

Shares 18,372 Value ($000) $1,018 Avg Close $47.28 Range $32.69 - $55.48

Q1 2025

Shares 4,301 Value ($000) $712 Avg Close $49.31 Range $39.14 - $58.82

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	21,552	$1,386	$66.89	$58.88 - $73.26
Q3 2025	19,381	$1,334	$62.79	$53.01 - $70.18
Q2 2025	18,372	$1,018	$47.28	$32.69 - $55.48
Q1 2025	4,301	$712	$49.31	$39.14 - $58.82