WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

CIK

1644956

City

CHICAGO

State / Country

Stock

MLM — Martin Marietta Materials Inc

Top Portfolio Positions

404 positions · $30,195,876,293 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	5,518,260	$1,864,895,967	6.18%
NVDA	Nvidia Corp Technology	8,941,756	$1,559,442,246	5.16%
AAPL	Apple Inc. Technology	4,812,433	$1,221,347,371	4.04%
MSFT	Microsoft Corp Technology	2,896,782	$1,072,301,792	3.55%
GOOGL	Alphabet Inc. Communication Services	2,504,605	$720,224,213	2.39%
AVGO	Broadcom Inc. Technology	2,201,558	$681,404,216	2.26%
AMZN	Amazon Com Inc Consumer Cyclical	3,163,629	$658,889,011	2.18%
META	Meta Platforms, Inc. Communication Services	1,013,122	$579,637,489	1.92%
MA	Mastercard Inc Financial Services	1,060,651	$529,964,878	1.76%
AZN	Astrazeneca Plc Healthcare	1,942,155	$383,031,809	1.27%

26 quarters · across all stocks

Compact Export CSV

25 of 25 shown

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$160,351,722	272,392	+0.8%	Shares	Sole	2026-05-08
2025-12-31	$168,244,599	270,203	-2.6%	Shares	Sole	2026-02-09
2025-09-30	$174,811,939	277,356	-3.3%	Shares	Sole	2025-11-12
2025-06-30	$157,395,066	286,715	-2.1%	Shares	Sole	2025-07-29
2025-03-31	$139,973,513	292,752	-33.2%	Shares	Sole	2025-05-09
2024-12-31	$226,331,333	438,202	+5.5%	Shares	Sole	2025-02-10
2024-09-30	$223,629,418	415,475	+10.8%	Shares	Sole	2024-11-08
2024-06-30	$203,072,599	374,811	+1.0%	Shares	Sole	2024-08-08
2024-03-31	$227,902,509	371,213	+11.7%	Shares	Sole	2024-05-08
2023-12-31	$165,832,195	332,389	+64.7%	Shares	Sole	2024-02-09
2023-09-30	$82,847,999	201,832	-61.2%	Shares	Sole	2023-11-09
2023-06-30	$240,109,271	520,066	+23.6%	Shares	Sole	2023-08-11
2023-03-31	$149,415,639	420,818	-16.2%	Shares	Sole	2023-05-12
2022-12-31	$169,812,688	502,449	-5.6%	Shares	Sole	2023-02-09
2022-09-30	$171,509,704	532,490	+72.7%	Shares	Sole	2022-11-09
2022-06-30	$92,285,915	308,401	-2.2%	Shares	Sole	2022-08-10
2022-03-31	$121,386,223	315,379	-53.3%	Shares	Sole	2022-05-11
2021-12-31	$297,621,038	675,613	-20.4%	Shares	Sole	2022-02-14
2021-09-30	$290,022,084	848,812	-12.3%	Shares	Sole	2021-11-10
2021-06-30	$340,556,301	968,012	-1.5%	Shares	Sole	2021-08-12
2021-03-31	$329,886,732	982,332	-15.4%	Shares	Sole	2021-05-13
2020-12-31	$329,734,605	1,161,160	-1.3%	Shares	Sole	2021-02-09
2020-09-30	$276,881,034	1,176,415	-1.5%	Shares	Sole	2020-11-06
2020-06-30	$246,605,125	1,193,809	+4.7%	Shares	Sole	2020-08-12
2020-03-31	$215,676,595	1,139,759	—	Shares	Sole	2020-05-08
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