WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

CIK

1644956

Location

CHICAGO, IL

Portfolio Value

Large $30,078,370,385

Diversification

Diversified

Filing Date

Global Rank

#208 / 8,607 ▼ 18 · as of Mar 2026

Top Industry

Semiconductors 16.4%

3Y Alpha vs SPY

-6.3%

Period ended 3 months ago

Filed May 8, 2026 · 2mo

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of cloning every reported 13F position and rebalancing on each filing, indexed to the same start.

Cloned portfolio

+49.8%

SPY

+76.7%

Annualised alpha

-6.5%

Max drawdown

−24.0%

Estimate. 13F holdings are quarter-lagged and long-only, so the clone rebalances about 45 days after each period end — when the filing becomes public — and excludes options and short positions. Past performance does not predict future results.

Portfolio Concentration

404 positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025

Top Position

6.2%

+0.6 pts

Top 5

21.4%

−1.0 pts

Top 10

30.8%

−2.0 pts

HHI

148

Diversified−9

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	36.3%	$10,931,487,808	77
Healthcare	12.7%	$3,816,019,157	52
Financial Services	11.6%	$3,495,078,851	65
Industrials	11.5%	$3,457,366,043	67
Consumer Cyclical	10.2%	$3,059,414,515	50
Communication Services	5.0%	$1,498,746,447	8
Consumer Defensive	4.2%	$1,263,981,042	18
Basic Materials	4.0%	$1,193,897,236	23
Energy	2.1%	$635,445,937	15
Real Estate	1.4%	$410,620,162	20
Utilities	1.1%	$316,313,187	9

Last Quarter's Activity

Export CSV

Mar 31, 2026 vs Dec 31, 2025

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
ALHC	Alignment Healthcare, Inc.	+2,909,359	5,214,614	$91,881,498
TIGO	Millicom International Cellular SA	+1,280,433	1,405,608	$105,336,263
STEP	StepStone Group Inc.	+1,244,285	1,914,477	$91,358,842
GFI	Gold Fields Ltd	+999,148	1,024,824	$46,527,009
BRBR	Bellring Brands, Inc.	+803,800	3,032,100	$48,786,489
IIIV	i3 Verticals, Inc.	+790,575	1,176,960	$26,316,825
BSY	Bentley Systems Inc	+707,550	3,322,723	$116,694,031
TTE	TotalEnergies SE	+688,876	853,751	$77,674,265
HALO	Halozyme Therapeutics, Inc.	+683,019	2,525,975	$163,253,764
CHRW	C. H. Robinson Worldwide, Inc.	+604,157	1,041,658	$172,988,144
CMG	Chipotle Mexican Grill Inc	+597,632	3,910,673	$125,180,642
LOPE	Grand Canyon Education, Inc.	+526,594	979,734	$166,584,172
PRMB	Primo Brands Corp	+428,772	13,056,192	$245,848,095
SILA	Sila Realty Trust, Inc.	+407,144	1,387,324	$32,851,832
KNX	Knight-Swift Transportation Holdings Inc.	+399,047	943,286	$54,314,407
RYAAY	Ryanair Holdings PLC	+369,378	420,246	$24,290,218
HLIO	Helios Technologies, Inc.	+343,665	931,008	$60,245,527
MLI	Mueller Industries Inc	+329,823	2,109,729	$116,878,986
HUBG	Hub Group, Inc.	+299,708	925,602	$33,358,696
STRL	Sterling Infrastructure, Inc.	+282,167	323,421	$131,719,670
AUB	Atlantic Union Bankshares Corp	+268,994	1,380,238	$49,329,706
NXT	Nextpower Inc.	+259,695	1,622,489	$195,591,048
VVV	Valvoline Inc	+258,541	958,268	$32,274,466
TGLS	Tecnoglass Inc.	+243,040	1,173,073	$52,260,402
FBK	FB Financial Corp	+237,693	720,893	$37,443,182
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
GRAB	Grab Holdings Ltd	−18,969,385	3,706,898	$13,567,246
NU	Nu Holdings Ltd.	−6,431,767	12,267,600	$176,285,412
ITUB	Itau Unibanco Holding S.A.	−4,867,055	31,684,708	$265,517,853
ACVA	ACV Auctions Inc.	−3,679,063	7,212,623	$30,581,521
INTR	Inter & Co, Inc.	−3,079,733	2,515,463	$20,023,085
VRRM	VERRA MOBILITY Corp	−3,050,331	388,617	$5,553,336
QTWO	Q2 Holdings, Inc.	−2,392,584	302,134	$14,290,938
ONB	Old National Bancorp /In/	−2,063,138	3,894,798	$86,075,035
NVDA	Nvidia Corp	−1,686,911	8,941,756	$1,559,442,246
AMZN	Amazon Com Inc	−1,223,374	3,163,629	$658,889,011
BCO	Brinks Co	−1,211,354	333,287	$34,538,531
ORCL	Oracle Corp	−1,200,810	55,726	$8,197,851
WSC	WillScot Holdings Corp	−1,155,226	1,494,201	$25,939,329
TRU	TransUnion	−1,074,308	2,891,187	$200,041,228
ECVT	Ecovyst Inc.	−864,128	1,864,621	$23,979,026
P	Everpure, Inc.	−861,447	2,881,481	$170,122,638
CG	Carlyle Group Inc.	−830,793	6,301,109	$304,910,664
HAYW	Hayward Holdings, Inc.	−828,014	994,229	$13,302,784
MNST	Monster Beverage Corp	−826,002	2,935,247	$212,687,997
HR	Healthcare Realty Trust Inc	−819,484	1,315,096	$22,343,481
ORLY	O Reilly Automotive Inc	−771,473	2,210,034	$204,008,238
ONTO	Onto Innovation Inc.	−762,374	964,213	$197,731,159
BWIN	Baldwin Insurance Group, Inc.	−749,321	6,794,492	$149,071,154
BANC	Banc Of California, Inc.	−733,886	1,583,477	$27,837,525
CIEN	Ciena Corp	−700,014	398,579	$154,740,325
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
AZN	Astrazeneca PLC	1,942,155	$383,031,809
AKAM	Akamai Technologies Inc	1,619,060	$185,949,041
BWA	Borgwarner Inc	2,884,062	$156,489,204
APH	Amphenol Corp /De/	1,077,434	$136,133,785
POWI	Power Integrations Inc	2,380,677	$121,890,662
SYNA	SYNAPTICS Inc	1,586,244	$111,100,529
LFUS	Littelfuse Inc /De	304,575	$103,357,526
NBHC	National Bank Holdings Corp	2,474,861	$96,915,556
BIRK	Birkenstock Holding plc	2,575,402	$92,276,653
KMT	Kennametal Inc	2,482,535	$89,693,989
GH	Guardant Health, Inc.	951,114	$87,854,400
CASY	Caseys General Stores Inc	118,098	$85,958,810
CFR	Cullen/Frost Bankers, Inc.	611,831	$83,869,793
TXN	Texas Instruments Inc	424,195	$82,353,217
CYTK	Cytokinetics Inc	1,087,591	$71,683,122
APG	APi Group Corp	1,740,449	$70,522,993
SCCO	Southern Copper Corp/	367,998	$62,690,814
SAIA	Saia Inc	170,145	$59,768,535
TEX	Terex Corp	853,618	$50,448,823
TEVA	Teva Pharmaceutical Industries Ltd	1,425,667	$42,941,090
VIST	Vista Energy, S.A.B. de C.V.	556,283	$41,982,678
MAR	Marriott International Inc /Md/	84,631	$27,680,261
CATY	Cathay General Bancorp	533,448	$26,597,717
MDA	MDA Space Ltd.	963,494	$24,395,668
MGRC	Mcgrath Rentcorp	219,784	$24,237,779
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
SE	Sea Ltd	2,370,876	$302,452,651
WAY	Waystar Holding Corp.	5,282,220	$172,992,705
FOLD	AMICUS THERAPEUTICS, INC.	10,627,717	$151,338,690
WAL	Western Alliance Bancorporation	1,711,503	$143,886,057
CWAN	Clearwater Analytics Holdings, Inc.	5,880,506	$141,837,804
TER	Teradyne, Inc	684,578	$132,506,917
OWL	Blue Owl Capital Inc.	7,615,956	$113,782,382
EXLS	ExlService Holdings, Inc.	2,584,072	$109,668,015
PEN	Penumbra Inc	345,974	$107,566,776
BAM	Brookfield Asset Management Ltd.	1,835,120	$96,141,936
MZTI	Marzetti Co	547,629	$90,041,160
TME	Tencent Music Entertainment Group	3,592,177	$62,970,862
CECO	Ceco Environmental Corp	706,273	$42,270,439
GXO	GXO Logistics, Inc.	618,514	$32,558,576
CTRE	CareTrust REIT, Inc.	835,850	$30,224,336
RMBS	Rambus Inc	316,397	$29,073,720
DBRG	DigitalBridge Group, Inc.	1,865,445	$28,615,926
SRAD	Sportradar Group AG	1,118,791	$26,593,662
ELME	Elme Communities	1,463,037	$25,456,843
HAE	Haemonetics Corp	314,654	$25,219,518
EXTR	Extreme Networks Inc	1,479,635	$24,635,922
AWI	Armstrong World Industries Inc	121,752	$23,266,807
WINA	Winmark Corp	51,781	$20,968,198
ESE	Esco Technologies Inc	97,783	$19,105,820
EMBC	Embecta Corp.	1,568,414	$18,632,758
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

404 positions · $30,078,370,385 total · as of Mar 31, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Real Estate Technology Utilities

Showing 1–50 of 404 positions by value · page 1 of 9

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	Reduced	5,518,260	-467,070	$1,864,895,967	+2.5%	6.20%
NVDA	Nvidia Corp Technology	Reduced	8,941,756	-1,686,911	$1,559,442,246	−21.3%	5.18%
AAPL	Apple Inc. Technology	Reduced	4,812,433	-631,895	$1,221,347,371	−17.5%	4.06%
MSFT	Microsoft Corp Technology	Reduced	2,896,782	-593,520	$1,072,301,792	−36.5%	3.57%
GOOGL	Alphabet Inc. Communication Services	Reduced	2,504,605	-650,368	$720,224,213	−27.1%	2.39%
AVGO	Broadcom Inc. Technology	Reduced	2,201,558	-335,053	$681,404,216	−22.4%	2.27%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	3,163,629	-1,223,374	$658,889,011	−34.9%	2.19%
META	Meta Platforms, Inc. Communication Services	Reduced	1,013,122	-173,647	$579,637,489	−26.0%	1.93%
MA	Mastercard Inc Financial Services	Reduced	1,060,651	-24,296	$529,964,878	−14.4%	1.76%
AZN	Astrazeneca PLC Healthcare	NEW	1,942,155	NEW	$383,031,809	NEW	1.27%
LIN	Linde PLC Basic Materials	Reduced	636,338	-7,132	$315,470,926	+15.0%	1.05%
CG	Carlyle Group Inc. Financial Services	Reduced	6,301,109	-830,793	$304,910,664	−27.7%	1.01%
COST	Costco Wholesale Corp /New Consumer Defensive	Reduced	302,468	-26,000	$301,388,189	+6.4%	1.00%
ITUB	Itau Unibanco Holding S.A. Financial Services	Reduced	31,684,708	-4,867,055	$265,517,853	+1.5%	0.88%
TWST	Twist Bioscience Corp Healthcare	Reduced	5,269,718	-684,711	$250,416,999	+32.6%	0.83%
NOW	ServiceNow, Inc. Technology	Added	2,371,614	+222,834	$247,952,243	−24.7%	0.82%
PRMB	Primo Brands Corp Consumer Defensive	Added	13,056,192	+428,772	$245,848,095	+19.1%	0.82%
INTU	Intuit Inc. Technology	Added	533,736	+91,345	$230,776,771	−21.2%	0.77%
MNST	Monster Beverage Corp Consumer Defensive	Reduced	2,935,247	-826,002	$212,687,997	−26.2%	0.71%
AMD	Advanced Micro Devices Inc Technology	Reduced	1,042,594	-296,952	$212,094,897	−26.1%	0.71%
BAP	Credicorp Ltd Financial Services	Reduced	622,690	-144,723	$211,203,994	−4.1%	0.70%
A	Agilent Technologies, Inc. Healthcare	Reduced	1,795,764	-267,245	$204,681,180	−27.1%	0.68%
ORLY	O Reilly Automotive Inc Consumer Cyclical	Reduced	2,210,034	-771,473	$204,008,238	−25.0%	0.68%
BWXT	BWX Technologies, Inc. Industrials	Reduced	981,782	-125,818	$200,764,601	+4.9%	0.67%
TRU	TransUnion Financial Services	Reduced	2,891,187	-1,074,308	$200,041,228	−41.2%	0.67%
ONTO	Onto Innovation Inc. Technology	Reduced	964,213	-762,374	$197,731,159	−27.5%	0.66%
IDXX	Idexx Laboratories Inc /De Healthcare	Reduced	351,621	-89,703	$197,572,323	−33.8%	0.66%
NXT	Nextpower Inc. Technology	Added	1,622,489	+259,695	$195,591,048	+64.8%	0.65%
ARGX	Argenx SE Healthcare	Added	266,067	+42,401	$194,295,426	+3.3%	0.65%
CAVA	Cava Group, Inc. Consumer Cyclical	Reduced	2,393,971	-25,276	$193,672,253	+36.4%	0.64%
LSCC	Lattice Semiconductor Corp Technology	Reduced	2,043,720	-81,540	$189,575,467	+21.2%	0.63%
FFIV	F5, Inc. Technology	Added	649,948	+99,684	$188,049,454	+33.9%	0.63%
AKAM	Akamai Technologies Inc Technology	NEW	1,619,060	NEW	$185,949,041	NEW	0.62%
CCJ	Cameco Corp Energy	Reduced	1,682,303	-298,524	$182,714,928	+0.8%	0.61%
UNH	Unitedhealth Group Inc Healthcare	Reduced	673,263	-88,980	$182,178,235	−27.6%	0.61%
MDGL	Madrigal Pharmaceuticals, Inc. Healthcare	Reduced	340,519	-13,701	$178,251,480	−13.6%	0.59%
NU	Nu Holdings Ltd. Financial Services	Reduced	12,267,600	-6,431,767	$176,285,412	−43.7%	0.59%
GMED	Globus Medical Inc Healthcare	Reduced	2,009,763	-510,019	$173,161,180	−21.3%	0.58%
CHRW	C. H. Robinson Worldwide, Inc. Industrials	Added	1,041,658	+604,157	$172,988,144	+146.0%	0.58%
P	Everpure, Inc. Technology	Reduced	2,881,481	-861,447	$170,122,638	−32.2%	0.57%
SNOW	Snowflake Inc. Technology	Reduced	1,127,525	-219,473	$170,053,320	−42.4%	0.57%
TLN	Talen Energy Corp Utilities	Reduced	525,214	-44,185	$167,664,065	−21.4%	0.56%
LOPE	Grand Canyon Education, Inc. Consumer Defensive	Added	979,734	+526,594	$166,584,172	+121.0%	0.55%
EG	Everest Group, Ltd. Financial Services	Reduced	506,166	-78,135	$165,440,357	−16.6%	0.55%
HALO	Halozyme Therapeutics, Inc. Healthcare	Added	2,525,975	+683,019	$163,253,764	+31.6%	0.54%
MLM	Martin Marietta Materials Inc Basic Materials	Added	272,392	+2,189	$160,351,722	−4.7%	0.53%
COHR	Coherent Corp. Technology	Reduced	668,137	-204,923	$159,156,914	−1.2%	0.53%
CW	Curtiss Wright Corp Industrials	Reduced	232,069	-45,768	$158,066,837	+3.2%	0.53%
RRX	Regal Rexnord Corp Industrials	Added	837,493	+78,210	$156,828,939	+47.2%	0.52%
BWA	Borgwarner Inc Consumer Cyclical	NEW	2,884,062	NEW	$156,489,204	NEW	0.52%