Chesley Taft & Associates LLC

Position in IBB — iShares Biotechnology ETF

CIK 1164632 CHICAGO, IL

Position in IBB

as of Mar 31, 2026 · filed Apr 13, 2026 Compact

Position Value

$4,019,980

-$436,728 QoQ

Shares Held

23,808

-9.8% QoQ

Ownership

—

of shares outstanding

% of Portfolio

0.20%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 94% Shared 0% None 6%

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$4,019,980	23,808	-9.8%	Shares	Sole	2026-04-13
2025-12-31	$4,456,708	26,407	+3.9%	Shares	Sole	2026-01-14
2025-09-30	$3,669,452	25,417	-0.4%	Shares	Sole	2025-10-08
2025-06-30	$3,227,523	25,512	-4.1%	Shares	Sole	2025-07-09
2025-03-31	$3,403,802	26,613	-0.3%	Shares	Sole	2025-04-10
2024-12-31	$3,529,742	26,698	-18.0%	Shares	Sole	2025-01-17
2024-09-30	$4,740,444	32,558	-1.1%	Shares	Sole	2024-10-07
2024-06-30	$4,520,246	32,932	+1.1%	Shares	Sole	2024-07-19
2024-03-31	$4,467,745	32,559	+1.0%	Shares	Sole	2024-04-16
2023-12-31	$4,381,434	32,252	-0.6%	Shares	Sole	2024-01-11
2023-09-30	$3,966,353	32,434	-0.1%	Shares	Sole	2023-10-11
2023-06-30	$4,122,264	32,469	-0.9%	Shares	Sole	2023-07-18
2023-03-31	$4,231,798	32,764	-2.1%	Shares	Sole	2023-04-11
2022-12-31	$4,395,064	33,476	+0.6%	Shares	Sole	2023-01-20
2022-09-30	$3,893,130	33,286	+1.6%	Shares	Sole	2022-10-13
2022-06-30	$3,855,558	32,777	+0.4%	Shares	Sole	2022-07-07
2022-03-31	$4,253,252	32,642	+2.8%	Shares	Sole	2022-04-14
2021-12-31	$4,844,311	31,741	+2.5%	Shares	Sole	2022-01-05
2021-09-30	$5,006,582	30,966	+0.0%	Shares	Sole	2021-10-05
2021-06-30	$5,065,949	30,956	+0.3%	Shares	Sole	2021-07-07
2021-03-31	$4,647,937	30,871	-17.6%	Shares	Sole	2021-04-06
2020-12-31	$5,678,451	37,484	+1.1%	Shares	Sole	2021-01-11
2020-09-30	$5,022,898	37,094	-3.2%	Shares	Sole	2020-10-08
2020-06-30	$5,238,507	38,324	-0.9%	Shares	Sole	2020-07-08
2020-03-31	$4,166,736	38,674	—	Shares	Sole	2020-04-15
No filing history on record for this holder in this stock.