BLACKROCK INC

Ticker: BLK CUSIP: 09290D101 Class: Common Stock

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

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

Q4 2025

Shares 4,543 Value ($000) $4,863 Avg Close $1089.41 Range $985.78 - $1214.03

Q3 2025

Shares 4,211 Value ($000) $4,909 Avg Close $1108.77 Range $1023.93 - $1177.77

Q2 2025

Shares 4,277 Value ($000) $4,488 Avg Close $933.09 Range $762.34 - $1044.14

Q1 2025

Shares 4,401 Value ($000) $4,165 Avg Close $961.85 Range $885.02 - $1062.44

Q4 2024

Shares 4,666 Value ($000) $4,783 Avg Close $991.05 Range $896.06 - $1060.71

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	4,543	$4,863	$1089.41	$985.78 - $1214.03
Q3 2025	4,211	$4,909	$1108.77	$1023.93 - $1177.77
Q2 2025	4,277	$4,488	$933.09	$762.34 - $1044.14
Q1 2025	4,401	$4,165	$961.85	$885.02 - $1062.44
Q4 2024	4,666	$4,783	$991.05	$896.06 - $1060.71