WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

CIK

1644956

Location

CHICAGO, IL

Portfolio Value

Large $30,157,499,574

Diversification

Diversified

Filing Date

Global Rank

#207 / 8,622 ▼ 16 · as of Mar 2026

Top Industry

Semiconductors 16.4%

3Y Alpha vs SPY

-6.1%

Period ended 4 months ago

Filed May 8, 2026 · 3mo

25 quarters · since Mar 2020

Clone Performance

Jul 2023–Jul 2026 · vs SPY

Hypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.

Cloned portfolio

+46.6%

SPY

+67.9%

Annualised alpha

-5.3%

Max drawdown

−23.9%

Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. It tracks 100% of reported value on average across 13 quarters. Past performance does not predict future results.

Portfolio Concentration

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

Top Position

6.2%

+0.6 pts

Top 5

21.3%

−1.0 pts

Top 10

30.7%

−2.0 pts

HHI

147

Diversified−9

Portfolio Trend

25 quarters · across all stocks

Sector Breakdown

As of Mar 31, 2026

Sector	% Portfolio	Value	Positions
Technology	36.2%	$10,931,487,808	77
Healthcare	12.7%	$3,816,019,157	52
Industrials	11.9%	$3,574,245,030	67
Financial Services	11.6%	$3,495,078,851	65
Consumer Cyclical	10.1%	$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%	$1,194,524,144	23
Energy	2.0%	$597,069,231	14
Real Estate	1.4%	$410,620,162	20
Utilities	1.0%	$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	$233,757,973
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 Holdings 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	$63,317,722
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

403 tracked positions · $30,157,499,574 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 403 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%	6.18%
NVDA	Nvidia Corp Technology	Reduced	8,941,756	-1,686,911	$1,559,442,246	−21.3%	5.17%
AAPL	Apple Inc. Technology	Reduced	4,812,433	-631,895	$1,221,347,371	−17.5%	4.05%
MSFT	Microsoft Corp Technology	Reduced	2,896,782	-593,520	$1,072,301,792	−36.5%	3.56%
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%	2.26%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	3,163,629	-1,223,374	$658,889,011	−34.9%	2.18%
META	Meta Platforms, Inc. Communication Services	Reduced	1,013,122	-173,647	$579,637,489	−26.0%	1.92%
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%
MLI	Mueller Industries Inc Industrials	Added	2,109,729	+329,823	$233,757,973	+14.4%	0.78%
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%	0.70%
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%	0.66%
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%	0.64%
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%	0.62%
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%	0.60%
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%	0.58%
GMED	Globus Medical Inc Healthcare	Reduced	2,009,763	-510,019	$173,161,180	−21.3%	0.57%
CHRW	C. H. Robinson Worldwide, Inc. Industrials	Added	1,041,658	+604,157	$172,988,144	+146.0%	0.57%
P	Everpure, Inc. Technology	Reduced	2,881,481	-861,447	$170,122,638	−32.2%	0.56%
SNOW	Snowflake Inc. Technology	Reduced	1,127,525	-219,473	$170,053,320	−42.4%	0.56%
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%	0.52%
RRX	Regal Rexnord Corp Industrials	Added	837,493	+78,210	$156,828,939	+47.2%	0.52%

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.