WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

CIK

1644956

Location

CHICAGO, IL

Portfolio Value

Large $33,471,309,357

Diversification

Diversified

Filing Date

Global Rank

#230 / 8,700 ▲ 3

Top Industry

Semiconductors 19.0%

Period ended 2 months ago

Filed Aug 12, 2026 · 32d

26 quarters · since Mar 2020

Portfolio Concentration

396 tracked positions · as of Jun 30, 2026 · Δ vs Mar 31, 2026

Top Position

7.0%

+0.9 pts

Top 5

20.7%

−0.6 pts

Top 10

29.1%

−1.6 pts

HHI

147

Diversified+0

Portfolio Trend

26 quarters · across all stocks

Sector Breakdown

As of Jun 30, 2026

Sector	% Portfolio	Value	Positions
Technology	38.0%	$12,715,804,890	74
Healthcare	13.6%	$4,550,585,742	50
Industrials	12.9%	$4,317,717,482	69
Financial Services	10.0%	$3,345,220,216	63
Consumer Cyclical	8.0%	$2,693,605,050	44
Communication Services	5.7%	$1,895,918,185	7
Consumer Defensive	3.8%	$1,262,119,875	18
Basic Materials	3.4%	$1,122,321,291	24
Energy	2.8%	$938,695,010	17
Utilities	0.9%	$313,175,227	9
Real Estate	0.9%	$312,836,835	20
Unclassified	0.0%	$3,309,554	1

Last Quarter's Activity

Export CSV

Jun 30, 2026 vs Mar 31, 2026

Added To

Positions the filer increased

25 positions

Ticker	Company	Δ Shares	Shares	Value
TEVA	Teva Pharmaceutical Industries Ltd	+5,167,554	6,593,221	$223,378,327
BSY	Bentley Systems Inc	+2,619,784	5,942,507	$177,621,534
ALHC	Alignment Healthcare, Inc.	+2,546,789	7,761,403	$184,799,005
DIOD	Diodes Inc /Del/	+1,241,124	1,682,686	$184,153,155
MIRM	Mirum Pharmaceuticals, Inc.	+1,069,072	1,404,741	$164,453,028
TTE	TotalEnergies SE	+965,524	1,819,275	$141,466,824
TKR	Timken Co	+949,663	954,839	$138,757,203
BWA	Borgwarner Inc	+900,645	3,784,707	$251,304,544
VERX	Vertex, Inc.	+849,202	2,128,372	$24,433,710
VIST	Vista Energy, S.A.B. de C.V.	+689,315	1,245,598	$79,469,152
GOOGL	Alphabet Inc.	+688,167	3,193,797	$1,141,355,982
WFRD	Weatherford International plc	+680,947	1,260,878	$102,761,557
DT	Dynatrace, Inc.	+628,690	3,857,741	$169,393,407
WGS	GeneDx Holdings Corp.	+625,384	1,400,653	$96,154,828
P	Everpure, Inc.	+573,900	3,455,381	$272,249,468
RVLV	Revolve Group, Inc.	+567,294	2,333,717	$53,418,782
HAYW	Hayward Holdings, Inc.	+555,632	1,549,861	$26,828,093
QTWO	Q2 Holdings, Inc.	+528,580	830,714	$39,957,343
EYE	National Vision Holdings, Inc.	+521,656	4,747,422	$90,248,492
CYTK	Cytokinetics Inc	+515,851	1,603,442	$136,597,223
AMAT	Applied Materials Inc /De	+463,006	497,946	$360,014,958
APH	Amphenol Corp /De/	+457,625	1,535,059	$541,323,205
VCYT	Veracyte, Inc.	+441,909	1,431,596	$84,077,633
RYAAY	Ryanair Holdings PLC	+390,037	810,283	$52,465,824
KNX	Knight-Swift Transportation Holdings Inc.	+386,761	1,330,047	$103,570,759
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
NU	Nu Holdings Ltd.	−4,671,549	7,596,051	$101,483,241
ITUB	Itau Unibanco Holding S.A.	−3,401,226	28,283,482	$231,076,047
TWST	Twist Bioscience Corp	−3,095,124	2,174,594	$223,722,230
GTX	Garrett Motion Inc.	−2,529,814	3,232,883	$117,127,351
TECH	BIO-TECHNE Corp	−2,458,427	4,060	$286,839
INTR	Inter & Co, Inc.	−1,663,175	852,288	$4,627,923
PRMB	Primo Brands Corp	−1,629,369	11,426,823	$279,271,554
COLD	Americold Realty Trust	−1,602,183	822,464	$12,929,134
DCI	DONALDSON Co INC	−1,580,385	34,964	$3,138,718
AAPL	Apple Inc.	−1,552,519	3,259,914	$943,288,715
CAVA	Cava Group, Inc.	−1,248,952	1,145,019	$89,861,091
CPRT	Copart Inc	−1,234,209	3,159,978	$89,079,779
AMZN	Amazon Com Inc	−1,176,544	1,987,085	$473,601,838
ECVT	Ecovyst Inc.	−1,004,182	860,439	$10,712,465
CWST	Casella Waste Systems Inc	−988,752	268,340	$26,020,929
NXT	Nextpower Inc.	−950,722	671,767	$80,034,320
ADTN	ADTRAN Holdings, Inc.	−890,511	1,099,019	$15,276,364
LSCC	Lattice Semiconductor Corp	−883,303	1,160,417	$177,497,384
MSFT	Microsoft Corp	−848,140	2,048,642	$764,184,438
GRAB	Grab Holdings Ltd	−846,828	2,860,070	$10,782,463
NOW	ServiceNow, Inc.	−820,422	1,551,192	$154,002,341
IBN	Icici Bank Ltd	−797,185	243,995	$7,083,174
KN	Knowles Corp	−780,184	494,516	$20,512,523
GMED	Globus Medical Inc	−724,867	1,284,896	$101,519,632
PDFS	Pdf Solutions Inc	−701,333	554,226	$39,233,658
No positions match the current search.

New Positions

Positions the filer opened this quarter

25 positions

Ticker	Company	Shares	Value
GE	General Electric Co	790,801	$295,546,057
CRWD	CrowdStrike Holdings, Inc.	281,409	$214,754,464
STX	Seagate Technology Holdings plc	190,847	$184,167,355
CNQ	CANADIAN NATURAL RESOURCES Ltd	3,635,082	$143,585,739
FPS	Forgent Power Solutions, Inc.	2,516,270	$140,558,842
PTCT	Ptc Therapeutics, Inc.	1,722,688	$140,519,660
ETSY	Etsy Inc	1,598,520	$120,416,511
RGEN	Repligen Corp	788,571	$107,592,627
HBM	Hudbay Minerals Inc.	4,215,842	$99,536,029
AAOI	Applied Optoelectronics, Inc.	504,202	$74,702,568
LRN	Stride, Inc.	823,698	$71,035,715
SPCX	Space Exploration Technologies Corp	349,477	$59,711,640
CRCL	Circle Internet Group, Inc.	861,252	$53,940,212
AMX	America Movil Sab De Cv/	2,010,385	$52,249,906
KRMN	Karman Holdings Inc.	977,462	$48,794,903
PRIM	Primoris Services Corp	399,966	$39,644,629
DPC	DPC Holdings PLC	640,005	$31,398,645
CIB	Grupo Cibest S.A.	356,370	$28,306,469
WBI	WaterBridge Infrastructure LLC	783,780	$26,860,140
RMBS	Rambus Inc	200,116	$26,563,397
SARO	StandardAero, Inc.	884,307	$26,449,622
HAE	Haemonetics Corp	332,075	$24,905,625
EEFT	Euronet Worldwide, Inc.	315,386	$23,083,101
CTRE	CareTrust REIT, Inc.	570,637	$23,025,202
CHEF	Chefs' Warehouse, Inc.	194,636	$18,704,519
No positions match the current search.

Sold Out

Positions the filer fully exited

25 positions

Ticker	Company	Shares	Value
COHR	Coherent Corp.	668,137	$159,156,914
VEEV	Veeva Systems Inc	643,325	$113,006,469
DOCS	Doximity, Inc.	4,834,220	$112,637,326
PLNT	Planet Fitness, Inc.	1,452,642	$108,047,511
POOL	Pool Corp	452,273	$91,508,396
WMS	Advanced Drainage Systems, Inc.	655,684	$89,913,946
PSN	Parsons Corp	1,487,529	$80,579,445
TYL	Tyler Technologies Inc	215,748	$73,867,800
INSP	Inspire Medical Systems, Inc.	1,137,384	$58,666,266
SPOT	Spotify Technology S.A.	106,941	$51,856,760
BRBR	Bellring Brands, Inc.	3,032,100	$48,786,489
GFI	Gold Fields Ltd	1,024,824	$46,527,009
LPX	Louisiana-Pacific Corp	596,108	$43,366,857
BE	Bloom Energy Corp	317,721	$43,048,018
ACVA	ACV Auctions Inc.	7,212,623	$30,581,521
PODD	Insulet Corp	139,130	$29,195,039
SMPL	Simply Good Foods Co	1,910,640	$27,417,684
IIIV	i3 Verticals, Inc.	1,176,960	$26,316,825
WSC	WillScot Holdings Corp	1,494,201	$25,939,329
AAXJ	iShares MSCI All Country Asia ex Japan ETF	183,890	$23,926,994
AMPX	Amprius Technologies, Inc.	1,170,131	$19,728,408
AEHR	Aehr Test Systems	513,293	$19,032,904
LITE	Lumentum Holdings Inc.	26,579	$18,678,658
BGSI	Boyd Group Services Inc.	135,248	$17,292,809
OMF	OneMain Holdings, Inc.	271,107	$14,501,513
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

396 tracked positions · $33,471,309,357 total · filing declares 403 positions · $33,254,908,063 · as of Jun 30, 2026

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

Showing 1–50 of 396 positions by value · page 1 of 8

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	Reduced	4,936,408	-581,852	$2,357,480,368	+26.4%	7.04%
NVDA	Nvidia Corp Technology	Reduced	8,599,021	-342,735	$1,720,578,111	+10.3%	5.14%
GOOGL	Alphabet Inc. Communication Services	Added	3,193,797	+688,167	$1,141,355,982	+58.4%	3.41%
AAPL	Apple Inc. Technology	Reduced	3,259,914	-1,552,519	$943,288,715	−22.8%	2.82%
AVGO	Broadcom Inc. Technology	Reduced	2,056,135	-145,423	$776,704,996	+14.0%	2.32%
MSFT	Microsoft Corp Technology	Reduced	2,048,642	-848,140	$764,184,438	−28.7%	2.28%
APH	Amphenol Corp /De/ Technology	Added	1,535,059	+457,625	$541,323,205	+98.8%	1.62%
META	Meta Platforms, Inc. Communication Services	Reduced	950,115	-63,007	$535,190,278	−7.7%	1.60%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	1,987,085	-1,176,544	$473,601,838	−28.1%	1.41%
MA	Mastercard Inc Financial Services	Reduced	918,005	-142,646	$471,487,368	−11.0%	1.41%
AMD	Advanced Micro Devices Inc Technology	Reduced	763,517	-279,077	$443,534,660	+109.1%	1.33%
AMAT	Applied Materials Inc /De Technology	Added	497,946	+463,006	$360,014,958	+2914.7%	1.08%
GE	General Electric Co Industrials	NEW	790,801	NEW	$295,546,057	NEW	0.88%
AZN	Astrazeneca PLC Healthcare	Reduced	1,514,795	-427,360	$287,235,427	−25.0%	0.86%
PRMB	Primo Brands Corp Consumer Defensive	Reduced	11,426,823	-1,629,369	$279,271,554	+13.6%	0.83%
P	Everpure, Inc. Technology	Added	3,455,381	+573,900	$272,249,468	+60.0%	0.81%
LIN	Linde PLC Basic Materials	Reduced	504,953	-131,385	$262,040,309	−16.9%	0.78%
ONTO	Onto Innovation Inc. Technology	Reduced	665,377	-298,836	$251,811,925	+27.4%	0.75%
BWA	Borgwarner Inc Consumer Cyclical	Added	3,784,707	+900,645	$251,304,544	+60.6%	0.75%
CG	Carlyle Group Inc. Financial Services	Reduced	5,914,905	-386,204	$249,076,649	−18.3%	0.74%
ARGX	Argenx SE Healthcare	Reduced	264,617	-1,450	$245,503,714	+26.4%	0.73%
MLI	Mueller Industries Inc Industrials	Reduced	1,986,139	-123,590	$244,156,067	+4.4%	0.73%
MNST	Monster Beverage Corp Consumer Defensive	Reduced	2,538,136	-397,111	$243,965,632	+14.7%	0.73%
FFIV	F5, Inc. Technology	Reduced	586,271	-63,677	$243,865,285	+29.7%	0.73%
BAP	Credicorp Ltd Financial Services	Added	625,144	+2,454	$243,543,599	+15.3%	0.73%
CW	Curtiss Wright Corp Industrials	Added	317,306	+85,237	$240,441,794	+52.1%	0.72%
ITUB	Itau Unibanco Holding S.A. Financial Services	Reduced	28,283,482	-3,401,226	$231,076,047	−13.0%	0.69%
SNOW	Snowflake Inc. Technology	Reduced	901,087	-226,438	$229,326,641	+34.9%	0.69%
TWST	Twist Bioscience Corp Healthcare	Reduced	2,174,594	-3,095,124	$223,722,230	−10.7%	0.67%
TEVA	Teva Pharmaceutical Industries Ltd Healthcare	Added	6,593,221	+5,167,554	$223,378,327	+420.2%	0.67%
UNH	Unitedhealth Group Inc Healthcare	Reduced	523,387	-149,876	$217,535,338	+19.4%	0.65%
CRWD	CrowdStrike Holdings, Inc. Technology	NEW	281,409	NEW	$214,754,464	NEW	0.64%
RRX	Regal Rexnord Corp Industrials	Added	891,139	+53,646	$212,260,398	+35.3%	0.63%
KRYS	Krystal Biotech, Inc. Healthcare	Added	570,153	+162,975	$211,908,765	+101.5%	0.63%
CRS	Carpenter Technology Corp Industrials	Reduced	332,607	-18,289	$205,165,301	+48.3%	0.61%
POWI	Power Integrations Inc Technology	Added	2,382,007	+1,330	$199,516,906	+63.7%	0.60%
NVT	nVent Electric plc Industrials	Reduced	1,167,763	-66,111	$198,064,282	+35.7%	0.59%
GH	Guardant Health, Inc. Healthcare	Added	1,311,320	+360,206	$196,737,339	+123.9%	0.59%
HALO	Halozyme Therapeutics, Inc. Healthcare	Reduced	2,511,050	-14,925	$196,539,883	+20.4%	0.59%
TLN	Talen Energy Corp Utilities	Reduced	497,660	-27,554	$191,230,831	+14.1%	0.57%
TRU	TransUnion Financial Services	Reduced	2,648,744	-242,443	$191,080,392	−4.5%	0.57%
CCJ	Cameco Corp Energy	Added	1,858,735	+176,432	$189,330,747	+3.6%	0.57%
STRL	Sterling Infrastructure, Inc. Industrials	Reduced	223,697	-99,724	$187,762,313	+42.5%	0.56%
COST	Costco Wholesale Corp /New Consumer Defensive	Reduced	199,355	-103,113	$186,490,621	−38.1%	0.56%
ALHC	Alignment Healthcare, Inc. Healthcare	Added	7,761,403	+2,546,789	$184,799,005	+101.1%	0.55%
CHRW	C. H. Robinson Worldwide, Inc. Industrials	Reduced	978,297	-63,361	$184,252,456	+6.5%	0.55%
STX	Seagate Technology Holdings plc Technology	NEW	190,847	NEW	$184,167,355	NEW	0.55%
DIOD	Diodes Inc /Del/ Technology	Added	1,682,686	+1,241,124	$184,153,155	+511.0%	0.55%
BWXT	BWX Technologies, Inc. Industrials	Reduced	941,233	-40,549	$183,211,003	−8.7%	0.55%
AKAM	Akamai Technologies Inc Technology	Reduced	1,535,467	-83,593	$181,507,554	−2.4%	0.54%

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.