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Super Investors WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
WB

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$33.3B
Positions
403
Quarter ended
June 30, 2026
Filed
August 12, 2026

Reported portfolio value by quarter (44 quarters reported)

$49B $20.1B
Q3 15 Q4 17 Q1 20 Q2 22 Q3 24 Q2 26

$49B in Q3 2015 → $33.3B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
TS Taiwan Semiconductor Manufac 7.1% Trimmed 11% 4,936,408 $2.36B
Nvidia Corporation 5.2% Trimmed 3.8% 8,599,021 $1.72B
Alphabet Inc 3.4% Added 27% 3,191,012 $1.14B
Apple Inc 2.8% Trimmed 32% 3,259,914 $943M
Broadcom Inc 2.3% Trimmed 6.6% 2,056,135 $777M
Microsoft Corp 2.3% Trimmed 29% 2,048,642 $764M
Meta Platforms Inc 1.6% Trimmed 6.2% 950,115 $535M
Amazon Com Inc 1.4% Trimmed 37% 1,987,085 $474M
Mastercard Incorporated 1.4% Trimmed 13% 918,005 $471M
Advanced Micro Devices Inc 1.3% Trimmed 27% 763,517 $444M
AM Applied Matls Inc 1.1% Added 1325% 497,946 $360M
GA Ge Aerospace 0.9% New 790,801 $296M
Astrazeneca PLC 0.9% Trimmed 22% 1,514,795 $283M
Primo Brands Corporation 0.8% Trimmed 12% 11,426,823 $279M
Everpure Inc 0.8% Added 20% 3,455,381 $272M
Amphenol Corp 0.8% Added 42% 1,535,059 $271M
Linde PLC 0.8% Trimmed 21% 504,953 $262M
Onto Innovation Inc 0.8% Trimmed 31% 665,377 $252M
Borgwarner Inc 0.8% Added 31% 3,784,707 $251M
Carlyle Group Inc 0.7% Trimmed 6.1% 5,914,905 $249M
Argenx Se 0.7% Trimmed 0.5% 264,617 $245M
MI Mueller Inds Inc 0.7% Trimmed 5.9% 1,986,139 $244M
MB Monster Beverage Corp New 0.7% Trimmed 14% 2,538,136 $244M
F5 Inc 0.7% Trimmed 9.8% 586,271 $244M
Credicorp Ltd 0.7% Added 0.4% 625,144 $244M
Curtiss Wright Corp 0.7% Added 37% 317,306 $240M
IU Itau Unibanco Hldg S A 0.7% Trimmed 11% 28,283,482 $231M
Snowflake Inc 0.7% Trimmed 20% 901,087 $229M
Twist Bioscience Corp 0.7% Trimmed 59% 2,174,594 $224M
TP Teva Pharmaceutical Inds Ltd 0.7% Added 362% 6,593,221 $223M
Unitedhealth Group Inc 0.7% Trimmed 22% 523,387 $218M
CH Crowdstrike Hldgs Inc 0.6% New 281,409 $215M
Regal Rexnord Corporation 0.6% Added 6.4% 891,139 $212M
Krystal Biotech Inc 0.6% Added 40% 570,153 $212M
Carpenter Technology Corp 0.6% Trimmed 5.2% 332,607 $205M
Power Integrations Inc 0.6% Added 0.1% 2,382,007 $200M
NE Nvent Elec PLC 0.6% Trimmed 5.4% 1,167,763 $198M
Guardant Health Inc 0.6% Added 38% 1,311,320 $197M
Halozyme Therapeutics Inc 0.6% Trimmed 0.6% 2,511,050 $197M
Talen Energy Corp 0.6% Trimmed 5.2% 497,660 $191M
Transunion 0.6% Trimmed 8.4% 2,648,744 $191M
Cameco Corp 0.6% Added 10% 1,858,735 $189M
Sterling Infrastructure Inc 0.6% Trimmed 31% 223,697 $188M
Costco Wholesale Corporation 0.6% Trimmed 34% 199,355 $186M
Alignment Healthcare Inc 0.6% Added 49% 7,761,403 $185M
CH C H Robinson Worldwide In 0.6% Trimmed 6.1% 978,297 $184M
ST Seagate Technology Hldngs Pl 0.6% New 190,847 $184M
Diodes Inc 0.6% Added 281% 1,682,686 $184M
Bwx Technologies Inc 0.6% Trimmed 4.1% 941,233 $183M
Akamai Technologies Inc 0.5% Trimmed 5.2% 1,535,467 $182M
BI The Baldwin Insurance Grp In 0.5% Trimmed 0.9% 6,732,965 $179M
BS Bentley Sys Inc 0.5% Added 79% 5,942,507 $178M
Lattice Semiconductor Corp 0.5% Trimmed 43% 1,160,417 $177M
Madrigal Pharmaceuticals Inc 0.5% Trimmed 4.8% 324,123 $174M
Everest Group Ltd 0.5% Trimmed 5.2% 479,877 $171M
Agilent Technologies Inc 0.5% Trimmed 28% 1,287,265 $171M
OA Oreilly Automotive Inc 0.5% Trimmed 16% 1,855,002 $171M
Dynatrace Inc 0.5% Added 19% 3,857,741 $169M
Mirum Pharmaceuticals Inc 0.5% Added 318% 1,404,741 $164M
Healthequity Inc 0.5% Added 6.8% 1,773,227 $160M

Showing top 60 of 403 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 12, 2026

Company Action Shares changed Value of change % of portfolio
Apple Inc Trimmed −1,552,519 −$449M 2.8%
AM Applied Matls Inc Added +463,006 +$335M 1.1%
Twist Bioscience Corp Trimmed −3,095,124 −$318M 0.7%
Microsoft Corp Trimmed −848,140 −$316M 2.3%
GA Ge Aerospace New +790,801 +$296M 0.9%
Amazon Com Inc Trimmed −1,176,544 −$280M 1.4%
TS Taiwan Semiconductor Manufac Trimmed −581,852 −$278M 7.1%
Alphabet Inc Added +686,407 +$245M 3.4%
CH Crowdstrike Hldgs Inc New +281,409 +$215M 0.6%
ST Seagate Technology Hldngs Pl New +190,847 +$184M 0.6%

Showing the 10 largest of 453 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 08, 2026

Company Action Shares changed Value of change % of portfolio
Astrazeneca PLC New +1,942,155 +$377M 1.2%
Sea Ltd Exited −2,370,876 −$302M —
Nvidia Corporation Trimmed −1,686,911 −$294M 5.2%
Ciena Corp Trimmed −700,014 −$272M 0.5%
Amazon Com Inc Trimmed −1,223,374 −$255M 2.2%
Microsoft Corp Trimmed −593,520 −$220M 3.5%
Alphabet Inc Trimmed −650,368 −$187M 2.4%
Akamai Technologies Inc New +1,619,060 +$186M 0.6%
Oracle Corp Trimmed −1,200,810 −$177M —
WH Waystar Hldg Corp Exited −5,282,220 −$173M —

Showing the 10 largest of 455 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 09, 2026

Company Action Shares changed Value of change % of portfolio
Ciena Corp Trimmed −1,342,295 −$314M 0.7%
Lam Research Corp Trimmed −1,732,948 −$297M 0.1%
Servicenow Inc Added +1,774,770 +$272M 0.9%
RB Royal Bk Cda Trimmed −1,421,835 −$242M —
LN Live Nation Entertainment In Exited −1,400,174 −$229M —
Stride Inc Exited −1,511,080 −$225M —
Uber Technologies Inc Trimmed −2,590,339 −$212M —
Alphabet Inc Added +668,971 +$209M 2.8%
Argenx Se New +223,666 +$188M 0.5%
Snowflake Inc Added +828,789 +$182M 0.8%

Showing the 10 largest of 457 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 12, 2025

Company Action Shares changed Value of change % of portfolio
Alphabet Inc Added +2,126,770 +$517M 1.6%
Datadog Inc Trimmed −2,166,992 −$309M —
Amazon Com Inc Trimmed −979,192 −$215M 2.5%
NH Nu Hldgs Ltd Added +12,574,893 +$201M 0.8%
Talen Energy Corp Trimmed −422,085 −$180M 0.7%
Meta Platforms Inc Trimmed −242,994 −$178M 2.3%
MS Mercury Sys Inc Trimmed −2,207,726 −$171M 0.5%
BS Bentley Sys Inc New +2,931,296 +$151M 0.4%
ES Epam Sys Inc Exited −841,922 −$149M —
IL Idexx Labs Inc Trimmed −226,069 −$144M 0.8%

Showing the 10 largest of 461 changes.

Q2 2025

quarter ended June 30, 2025 · filed July 29, 2025

Company Action Shares changed Value of change % of portfolio
OA Oreilly Automotive Inc Added +3,285,249 +$296M 0.8%
E L F Beauty Inc Trimmed −2,075,714 −$258M 0.1%
YC Yum China Hldgs Inc Trimmed −4,853,287 −$217M 0.1%
Palo Alto Networks Inc Trimmed −1,035,967 −$212M 0.1%
Oracle Corp New +861,343 +$188M 0.5%
Bwx Technologies Inc Added +1,273,895 +$184M 0.6%
Blueprint Medicines Corp Trimmed −1,421,094 −$182M —
Stride Inc Trimmed −1,218,542 −$177M 0.4%
CI Chart Inds Inc Trimmed −1,038,346 −$171M —
TS Taiwan Semiconductor Mfg Ltd Trimmed −739,428 −$168M 4.0%

Showing the 10 largest of 456 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 09, 2025

Company Action Shares changed Value of change % of portfolio
Broadcom Inc Added +2,431,202 +$407M 1.4%
Advanced Micro Devices Inc Trimmed −2,062,244 −$212M —
Penumbra Inc Exited −883,098 −$210M —
CI Cf Inds Hldgs Inc Exited −2,354,192 −$201M —
AP Accenture PLC Ireland Trimmed −627,404 −$196M 0.3%
Sea Ltd Added +1,444,853 +$189M 1.3%
TI Texas Instrs Inc Exited −979,075 −$184M —
Tyler Technologies Inc Added +297,728 +$173M 0.5%
WH Waystar Hldg Corp New +4,227,425 +$158M 0.4%
Linde PLC Trimmed −294,590 −$137M 0.9%

Showing the 10 largest of 465 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 10, 2025

Company Action Shares changed Value of change % of portfolio
Primo Brands Corporation New +11,161,870 +$343M 0.8%
Intuitive Surgical Inc Trimmed −604,245 −$315M 0.1%
Icon PLC Trimmed −1,257,039 −$264M —
Lam Research Corp Exited −309,482 −$253M —
Lam Research Corp New +3,410,320 +$246M 0.6%
YC Yum China Hldgs Inc New +5,063,332 +$244M 0.6%
Talen Energy Corp New +1,191,166 +$240M 0.6%
Zoetis Inc Trimmed −1,284,619 −$209M 0.1%
BA Brookfield Asset Managmt Ltd New +3,767,650 +$204M 0.5%
QH Q2 Hldgs Inc New +2,013,368 +$203M 0.5%

Showing the 10 largest of 462 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 08, 2024

Company Action Shares changed Value of change % of portfolio
Alphabet Inc Trimmed −6,962,832 −$1.15B 0.4%
Meta Platforms Inc Added +1,421,779 +$814M 2.2%
Apple Inc Added +1,747,660 +$407M 3.3%
Transunion Added +2,198,113 +$230M 0.7%
Axon Enterprise Inc Exited −716,967 −$211M —
Manhattan Associates Inc New +624,427 +$176M 0.4%
Nvent Electric PLC New +2,380,715 +$167M 0.4%
Azek Co Inc New +3,543,851 +$166M 0.4%
MM Merit Med Sys Inc Trimmed −1,614,929 −$160M 0.4%
Sea Ltd New +1,685,649 +$159M 0.4%

Showing the 10 largest of 453 changes.

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