William Blair Investment Management, LLC Top Holdings and 13F Report (2026)

About William Blair Investment Management, LLC

Investment Activity

William Blair Investment Management, LLC has $33.25 billion in total holdings as of June 30, 2026.
William Blair Investment Management, LLC owns shares of 403 different stocks, but just 113 companies or ETFs make up 80% of its holdings.
Approximately 15.75% of the portfolio was purchased this quarter.
About 22.73% of the portfolio was sold this quarter.
This quarter, William Blair Investment Management, LLC has purchased 413 new stocks and bought additional shares in 119 stocks.
William Blair Investment Management, LLC sold shares of 230 stocks and completely divested from 57 stocks this quarter.

Largest Holdings

Taiwan Semiconductor Manufacturing: $2,357,357,783
NVIDIA: $1,720,578,016
Alphabet: $1,140,372,074
Apple: $943,288,764
Broadcom: $776,705,149

Largest New Holdings this Quarter

369604301 - GE Aerospace: $295,546,058 Holding
22788C105 - CrowdStrike: $214,754,464 Holding
G7997R103 - Seagate Technology: $184,167,355 Holding
136385101 - Canadian Natural Resources: $143,695,031 Holding
34631F102 - FORGENT POWER SOLUTIONS INC: $140,558,842 Holding

Largest Purchases this Quarter

Applied Materials: 463,006 shares (about $334.75M)
GE Aerospace: 790,801 shares (about $295.55M)
Alphabet: 686,407 shares (about $245.30M)
CrowdStrike: 281,409 shares (about $214.75M)
Seagate Technology: 190,847 shares (about $184.17M)

Largest Sales this Quarter

Apple: 1,552,519 shares (about $449.24M)
Twist Bioscience: 3,095,124 shares (about $318.43M)
Microsoft: 848,140 shares (about $316.37M)
Amazon.com: 1,176,544 shares (about $280.42M)
Taiwan Semiconductor Manufacturing: 581,852 shares (about $277.86M)

Sector Allocation Over Time

Selling

Neutral

Buying

Latest 13F Holdings and Changes Since Previous Quarterly Filing

Issuer Name	Holdings Value	Approximate Purchase/Sale	Change in Shares	Shares Held	% of Portfolio	Sector
TSM Taiwan Semiconductor Manufacturing	$2,357,357,783	$277,860,611 â–¼	-10.5%	4,936,408	7.1%	Technology
NVDA NVIDIA	$1,720,578,016	$68,577,842 â–¼	-3.8%	8,599,021	5.2%	Technology
GOOGL Alphabet	$1,140,372,074	$245,301,294 â–²	27.4%	3,191,012	3.4%	Communication Services
AAPL Apple	$943,288,764	$449,236,921 â–¼	-32.3%	3,259,914	2.8%	Technology
AVGO Broadcom	$776,705,149	$54,933,549 â–¼	-6.6%	2,056,135	2.3%	Technology
MSFT Microsoft	$764,184,389	$316,373,162 â–¼	-29.3%	2,048,642	2.3%	Technology
META Meta Platforms	$535,190,234	$35,491,210 â–¼	-6.2%	950,115	1.6%	Communication Services
AMZN Amazon.com	$473,601,839	$280,417,497 â–¼	-37.2%	1,987,085	1.4%	Consumer Discretionary
MA Mastercard	$471,487,500	$73,263,006 â–¼	-13.4%	918,005	1.4%	Finance
AMD Advanced Micro Devices	$443,534,660	$162,118,620 â–¼	-26.8%	763,517	1.3%	Technology
AMAT Applied Materials	$360,014,958	$334,753,338 â–²	1,325.1%	497,946	1.1%	Technology
GE GE Aerospace	$295,546,058	$295,546,058 â–²	New Holding	790,801	0.9%	Industrials
AZNCF AstraZeneca	$283,249,808	$79,911,564 â–¼	-22.0%	1,514,795	0.9%	Healthcare
PRIMO BRANDS CORPORATION	$279,271,556	$39,821,779 â–¼	-12.5%	11,426,823	0.8%	CLASS A COM SHS
EVERPURE INC	$272,249,469	$45,217,581 â–²	19.9%	3,455,381	0.8%	CL A
APH Amphenol	$270,661,603	$80,688,440 â–²	42.5%	1,535,059	0.8%	Technology
LINDE PLC	$262,040,310	$68,180,932 â–¼	-20.6%	504,953	0.8%	SHS
ONTO Onto Innovation	$251,811,926	$113,094,484 â–¼	-31.0%	665,377	0.8%	Technology
BWA BorgWarner	$251,304,551	$59,802,829 â–²	31.2%	3,784,707	0.8%	Consumer Discretionary
CG Carlyle Group	$249,076,659	$16,263,051 â–¼	-6.1%	5,914,905	0.7%	Finance
ARGX argenex	$245,489,701	$1,345,190 â–¼	-0.5%	264,617	0.7%	Healthcare
MLI Mueller Industries	$244,156,078	$15,192,919 â–¼	-5.9%	1,986,139	0.7%	Industrials
MNST Monster Beverage	$243,965,632	$38,170,309 â–¼	-13.5%	2,538,136	0.7%	Consumer Staples
FFIV F5	$243,865,285	$26,487,085 â–¼	-9.8%	586,271	0.7%	Technology
BAP Credicorp	$243,543,600	$956,029 â–²	0.4%	625,144	0.7%	Finance
CW Curtiss-Wright	$240,441,795	$64,589,189 â–²	36.7%	317,306	0.7%	Industrials
ITUB Itau Unibanco	$231,061,774	$27,786,300 â–¼	-10.7%	28,283,482	0.7%	Finance
SNOW Snowflake	$229,326,642	$57,628,471 â–¼	-20.1%	901,087	0.7%	Technology
TWST Twist Bioscience	$223,722,231	$318,426,358 â–¼	-58.7%	2,174,594	0.7%	Healthcare
TEVA Teva Pharmaceutical Industries	$223,369,747	$175,070,004 â–²	362.5%	6,593,221	0.7%	Healthcare
UNH UnitedHealth Group	$217,535,213	$62,292,926 â–¼	-22.3%	523,387	0.7%	Healthcare
CRWD CrowdStrike	$214,754,464	$214,754,464 â–²	New Holding	281,409	0.6%	Technology
RRX Regal Rexnord	$212,260,398	$12,777,941 â–²	6.4%	891,139	0.6%	Industrials
KRYS Krystal Biotech	$211,908,766	$60,572,918 â–²	40.0%	570,153	0.6%	Healthcare
CRS Carpenter Technology	$205,165,302	$11,281,387 â–¼	-5.2%	332,607	0.6%	Industrials
POWI Power Integrations	$199,516,906	$111,401 â–²	0.1%	2,382,007	0.6%	Technology
NVT nVent Electric	$198,064,282	$11,213,087 â–¼	-5.4%	1,167,763	0.6%	Industrials
GH Guardant Health	$196,737,340	$54,041,706 â–²	37.9%	1,311,320	0.6%	Healthcare
HALO Halozyme Therapeutics	$196,539,884	$1,168,180 â–¼	-0.6%	2,511,050	0.6%	Healthcare
TALEN ENERGY CORP	$191,230,832	$10,587,900 â–¼	-5.2%	497,660	0.6%	COM
TRU TransUnion	$191,080,410	$17,489,840 â–¼	-8.4%	2,648,744	0.6%	Industrials
CCJ Cameco	$189,330,699	$17,971,359 â–²	10.5%	1,858,735	0.6%	Energy
STRL Sterling Infrastructure	$187,762,314	$83,704,337 â–¼	-30.8%	223,697	0.6%	Industrials
COST Costco Wholesale	$186,490,622	$96,459,118 â–¼	-34.1%	199,355	0.6%	Consumer Staples
ALHC Alignment Healthcare	$184,799,005	$60,639,046 â–²	48.8%	7,761,403	0.6%	Healthcare
CHRW C.H. Robinson Worldwide	$184,252,457	$11,933,411 â–¼	-6.1%	978,297	0.6%	Industrials
STX Seagate Technology	$184,167,355	$184,167,355 â–²	New Holding	190,847	0.6%	Technology
DIOD Diodes	$184,153,156	$135,828,611 â–²	281.1%	1,682,686	0.6%	Technology
BWXT BWX Technologies	$183,211,003	$7,892,863 â–¼	-4.1%	941,233	0.6%	Industrials
AKAM Akamai Technologies	$181,507,554	$9,881,529 â–¼	-5.2%	1,535,467	0.5%	Technology
BRP The Baldwin Insurance Group	$178,962,210	$1,635,388 â–¼	-0.9%	6,732,965	0.5%	Finance
BSY Bentley Systems	$177,621,534	$78,305,344 â–²	78.8%	5,942,507	0.5%	Technology
LSCC Lattice Semiconductor	$177,497,384	$135,110,027 â–¼	-43.2%	1,160,417	0.5%	Technology
MDGL Madrigal Pharmaceuticals	$174,037,845	$8,803,832 â–¼	-4.8%	324,123	0.5%	Healthcare
EG Everest Group	$171,426,461	$9,391,219 â–¼	-5.2%	479,877	0.5%	Finance
A Agilent Technologies	$170,987,393	$67,543,915 â–¼	-28.3%	1,287,265	0.5%	Healthcare
ORLY O'Reilly Automotive	$170,827,134	$32,694,897 â–¼	-16.1%	1,855,002	0.5%	Consumer Discretionary
DT Dynatrace	$169,393,407	$27,605,778 â–²	19.5%	3,857,741	0.5%	Technology
MIRM Mirum Pharmaceuticals	$164,453,029	$125,156,259 â–²	318.5%	1,404,741	0.5%	Healthcare
HQY HealthEquity	$160,157,863	$10,261,346 â–²	6.8%	1,773,227	0.5%	Healthcare
IDXX IDEXX Laboratories	$156,960,192	$28,147,168 â–¼	-15.2%	298,154	0.5%	Healthcare
NOW ServiceNow	$154,002,342	$81,451,496 â–¼	-34.6%	1,551,192	0.5%	Technology
SYNA Synaptics	$153,998,241	$43,060,851 â–¼	-21.9%	1,239,622	0.5%	Technology
TXN Texas Instruments	$150,891,678	$24,451,874 â–²	19.3%	506,229	0.5%	Technology
SN SharkNinja	$150,260,950	$13,183,232 â–¼	-8.1%	986,806	0.5%	Consumer Discretionary
WST West Pharmaceutical Services	$149,813,786	$135,552,525 â–²	950.5%	417,309	0.5%	Healthcare
LOPE Grand Canyon Education	$148,666,675	$8,456,942 â–²	6.0%	1,038,828	0.4%	Consumer Discretionary
LFUS Littelfuse	$146,471,010	$7,788,875 â–²	5.6%	321,681	0.4%	Technology
CNQ Canadian Natural Resources	$143,695,031	$143,695,031 â–²	New Holding	3,635,082	0.4%	Energy
RS Reliance	$142,899,758	$7,842,985 â–¼	-5.2%	382,494	0.4%	Industrials
TOTALENERGIES SE	$141,364,811	$75,025,006 â–²	113.1%	1,819,275	0.4%	ACT
FORGENT POWER SOLUTIONS INC	$140,558,842	$140,558,842 â–²	New Holding	2,516,270	0.4%	COM SHS CL A
PTCT PTC Therapeutics	$140,519,660	$140,519,660 â–²	New Holding	1,722,688	0.4%	Healthcare
TKR Timken	$138,757,203	$138,005,027 â–²	18,347.4%	954,839	0.4%	Industrials
CYTK Cytokinetics	$136,597,224	$43,945,347 â–²	47.4%	1,603,442	0.4%	Healthcare
LECO Lincoln Electric	$134,576,930	$7,431,359 â–¼	-5.2%	506,862	0.4%	Industrials
EXP Eagle Materials	$129,760,200	$12,078,000 â–¼	-8.5%	576,712	0.4%	Materials
CLH Clean Harbors	$125,238,988	$7,136,540 â–¼	-5.4%	419,210	0.4%	Industrials
NOVT Novanta	$124,254,262	$2,793,286 â–¼	-2.2%	765,867	0.4%	Technology
BIRKENSTOCK HOLDING PLC	$123,319,462	$12,499,914 â–²	11.3%	2,865,895	0.4%	COM SHS
FHN First Horizon	$123,282,838	$6,406,641 â–¼	-4.9%	4,808,223	0.4%	Finance
ETSY INC	$120,416,512	$120,416,512 â–²	New Holding	1,598,520	0.4%	COM
TIGO Millicom International Cellular	$118,854,304	$8,718,678 â–¼	-6.8%	1,309,545	0.4%	Communication Services
DIEBOLD NIXDORF INC	$117,289,596	$3,988,373 â–¼	-3.3%	1,379,553	0.4%	COM SHS
GARRETT MOTION INC	$117,127,351	$91,655,161 â–¼	-43.9%	3,232,883	0.4%	COM
EHC Encompass Health	$116,351,672	$35,169,169 â–²	43.3%	1,151,085	0.3%	Healthcare
APPF AppFolio	$115,744,799	$12,602,708 â–²	12.2%	721,826	0.3%	Technology
MAR Marriott International	$111,500,154	$80,136,752 â–²	255.5%	300,872	0.3%	Consumer Discretionary
NBHC National Bank	$110,978,009	$1,019,935 â–²	0.9%	2,497,817	0.3%	Finance
CMG Chipotle Mexican Grill	$110,015,908	$22,946,974 â–¼	-17.3%	3,235,762	0.3%	Consumer Discretionary
SAIA Saia	$109,088,863	$37,430,595 â–²	52.2%	259,020	0.3%	Industrials
RGEN Repligen	$107,592,627	$107,592,627 â–²	New Holding	788,571	0.3%	Healthcare
FRPT Freshpet	$107,065,965	$129,532 â–¼	-0.1%	1,810,994	0.3%	Consumer Staples
JAZZ Jazz Pharmaceuticals	$105,278,106	$88,197,430 â–²	516.4%	436,893	0.3%	Healthcare
MLM Martin Marietta Materials	$104,902,883	$52,185,583 â–¼	-33.2%	181,902	0.3%	Materials
KNX Knight-Swift Transportation	$103,570,760	$30,117,079 â–²	41.0%	1,330,047	0.3%	Industrials
WFRD Weatherford International	$102,761,557	$55,497,181 â–²	117.4%	1,260,878	0.3%	Energy
GMED Globus Medical	$101,519,633	$57,271,742 â–¼	-36.1%	1,284,896	0.3%	Healthcare
NU NU	$101,483,241	$62,411,894 â–¼	-38.1%	7,596,051	0.3%	Finance
HBM HudBay Minerals	$99,536,030	$99,536,030 â–²	New Holding	4,215,842	0.3%	Materials

Showing largest 100 holdings. View all holdings.

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William Blair Investment Management, LLC Top Holdings and 13F Report (2026)

About William Blair Investment Management, LLC

Investment Activity

Largest Holdings

Largest New Holdings this Quarter

Largest Purchases this Quarter

Largest Sales this Quarter

Sector Allocation Over Time

Latest 13F Holdings and Changes Since Previous Quarterly Filing

More Institutional Buying and Selling Information

Best-in-Class Portfolio Monitoring

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William Blair Investment Management, LLC Top Holdings and 13F Report (2026)

About William Blair Investment Management, LLC

Investment Activity

Largest Holdings

Largest New Holdings this Quarter

Largest Purchases this Quarter

Largest Sales this Quarter

Sector Allocation Over Time

Map of 500 Largest Holdings ofWilliam Blair Investment Management, LLC

Latest 13F Holdings and Changes Since Previous Quarterly Filing

More Institutional Buying and Selling Information

MarketBeat All Access Features

Best-in-Class Portfolio Monitoring

Stock Ideas and Recommendations

Advanced Stock Screeners and Research Tools