account_balance
Investment manager · 13F filer · SEC CIK 1644956
William Blair Investment Management, LLC
Reported value$30.8Bas of Sep 30, 2026
Positions399 42 new, 46 sold out
Top 10 weight31.0%TSM alone is 7%
FiledNov 637 days after quarter end
Portfolio · as of Sep 30, 2026
Where the money is
New or addedTrimmedHeld
TSMTaiwan Semiconductor Manufac
6.8%Trimmed −7%
NVDANvidia Corporation
6.0%Trimmed −6%
GOOGLAlphabet Inc
4.0%Added +13%
AAPLApple Inc
3.3%Trimmed −7%
MSFTMicrosoft Corp
2.8%Trimmed −16%
AVGOBroadcom Inc
2.3%Trimmed −4%
METAMeta Platforms Inc
1.9%Trimmed −15%
AMDAdvanced Micro Devices Inc
1.6%Added +3%
MAMastercard Incorporated
1.3%Trimmed −23%
P1.1%AMZNAmazon Com Inc
1.1%Trimmed −33%
AMAT1.0%TSMTaiwan Semiconductor Manufac
6.8%Trimmed −7%
NVDANvidia Corporation
6.0%Trimmed −6%
GOOGL4.0%AAPL3.3%MSFT2.8%AVGO2.3%META1.9%AMD1.6%MA1.3%P1.1%AMZN1.1%AMAT1.0%Boxes show the top 12 stocks, sized against each other. The bar above shows how much of the fund they are. 13F only covers US-listed stocks, so foreign holdings and short positions are missing.
Show the top 12 as a list
TSM Taiwan Semiconductor Manufac 6.8% Trimmed −7%NVDA Nvidia Corporation 6.0% Trimmed −6%GOOGL Alphabet Inc 4.0% Added +13%AAPL Apple Inc 3.3% Trimmed −7%MSFT Microsoft Corp 2.8% Trimmed −16%AVGO Broadcom Inc 2.3% Trimmed −4%META Meta Platforms Inc 1.9% Trimmed −15%AMD Advanced Micro Devices Inc 1.6% Added +3%MA Mastercard Incorporated 1.3% Trimmed −23%P Everpure Inc 1.1% Trimmed −26%AMZN Amazon Com Inc 1.1% Trimmed −33%AMAT Applied Matls Inc 1.0% Added +22%
What changed