Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| Taiwan Semiconductor ManufacSPONSORED ADS | SPONSORED ADS | $2,357,357,783 | 7.1% |
| Nvidia CorporationCOM | COM | $1,720,578,016 | 5.2% |
| Alphabet Inc.CAP STK CL A | CAP STK CL A | $1,140,372,074 | 3.4% |
| Apple Inc.COM | COM | $943,288,764 | 2.8% |
| Broadcom Inc.COM | COM | $776,705,149 | 2.3% |
| Microsoft Corp.COM | COM | $764,184,389 | 2.3% |
| Meta Platforms Inc.CL A | CL A | $535,190,234 | 1.6% |
| Amazon Com Inc.COM | COM | $473,601,839 | 1.4% |
| Mastercard IncorporatedCL A | CL A | $471,487,500 | 1.4% |
| Advanced Micro Devices Inc.COM | COM | $443,534,660 | 1.3% |
| Applied Matls Inc.COM | COM | $360,014,958 | 1.1% |
| GE AerospaceCOM NEW | COM NEW | $295,546,058 | 0.9% |
| Astrazeneca PLCORD | ORD | $283,249,808 | 0.9% |
| Primo Brands CorporationCLASS A COM SHS | CLASS A COM SHS | $279,271,556 | 0.8% |
| Everpure Inc.CL A | CL A | $272,249,469 | 0.8% |
| Amphenol Corp.CL A | CL A | $270,661,603 | 0.8% |
| Linde PLCSHS | SHS | $262,040,310 | 0.8% |
| Onto Innovation Inc.COM | COM | $251,811,926 | 0.8% |
| Borgwarner Inc.COM | COM | $251,304,551 | 0.8% |
| Carlyle Group Inc.COM | COM | $249,076,659 | 0.7% |
| Argenx SESPONSORED ADR | SPONSORED ADR | $245,489,701 | 0.7% |
| Mueller Inds Inc.COM | COM | $244,156,078 | 0.7% |
| Monster Beverage Corp. NewCOM | COM | $243,965,632 | 0.7% |
| F5 Inc.COM | COM | $243,865,285 | 0.7% |
| Credicorp LtdCOM | COM | $243,543,600 | 0.7% |
| Curtiss Wright Corp.COM | COM | $240,441,795 | 0.7% |
| Itau Unibanco Hldg S ASPON ADR REP PFD | SPON ADR REP PFD | $231,061,774 | 0.7% |
| Snowflake Inc.COM SHS | COM SHS | $229,326,642 | 0.7% |
| Twist Bioscience Corp.COM | COM | $223,722,231 | 0.7% |
| Teva Pharmaceutical Inds LtdSPONSORED ADS | SPONSORED ADS | $223,369,747 | 0.7% |
| Unitedhealth Group Inc.COM | COM | $217,535,213 | 0.7% |
| Crowdstrike Hldgs Inc.CL A | CL A | $214,754,464 | 0.6% |
| Regal Rexnord CorporationCOM | COM | $212,260,398 | 0.6% |
| Krystal Biotech Inc.COM | COM | $211,908,766 | 0.6% |
| Carpenter Technology Corp.COM | COM | $205,165,302 | 0.6% |
| Power Integrations Inc.COM | COM | $199,516,906 | 0.6% |
| Nvent Elec PLCSHS | SHS | $198,064,282 | 0.6% |
| Guardant Health Inc.COM | COM | $196,737,340 | 0.6% |
| Halozyme Therapeutics Inc.COM | COM | $196,539,884 | 0.6% |
| Talen Energy Corp.COM | COM | $191,230,832 | 0.6% |
| TransunionCOM | COM | $191,080,410 | 0.6% |
| Cameco Corp.COM | COM | $189,330,699 | 0.6% |
| Sterling Infrastructure Inc.COM | COM | $187,762,314 | 0.6% |
| Costco Wholesale CorporationCOM | COM | $186,490,622 | 0.6% |
| Alignment Healthcare Inc.COM | COM | $184,799,005 | 0.6% |
| C H Robinson Worldwide INCOM NEW | COM NEW | $184,252,457 | 0.6% |
| Seagate Technology Hldngs PLORD SHS | ORD SHS | $184,167,355 | 0.6% |
| Diodes Inc.COM | COM | $184,153,156 | 0.6% |
| Bwx Technologies Inc.COM | COM | $183,211,003 | 0.6% |
| Akamai Technologies Inc.COM | COM | $181,507,554 | 0.5% |
Taiwan Semiconductor ManufacSPONSORED ADS$2,357,357,783
- Class
- SPONSORED ADS
- Share
- 7.1%
Nvidia CorporationCOM$1,720,578,016
- Class
- COM
- Share
- 5.2%
Alphabet Inc.CAP STK CL A$1,140,372,074
- Class
- CAP STK CL A
- Share
- 3.4%
Apple Inc.COM$943,288,764
- Class
- COM
- Share
- 2.8%
Broadcom Inc.COM$776,705,149
- Class
- COM
- Share
- 2.3%
Microsoft Corp.COM$764,184,389
- Class
- COM
- Share
- 2.3%
Meta Platforms Inc.CL A$535,190,234
- Class
- CL A
- Share
- 1.6%
Amazon Com Inc.COM$473,601,839
- Class
- COM
- Share
- 1.4%
Mastercard IncorporatedCL A$471,487,500
- Class
- CL A
- Share
- 1.4%
Advanced Micro Devices Inc.COM$443,534,660
- Class
- COM
- Share
- 1.3%
Applied Matls Inc.COM$360,014,958
- Class
- COM
- Share
- 1.1%
GE AerospaceCOM NEW$295,546,058
- Class
- COM NEW
- Share
- 0.9%
Astrazeneca PLCORD$283,249,808
- Class
- ORD
- Share
- 0.9%
Primo Brands CorporationCLASS A COM SHS$279,271,556
- Class
- CLASS A COM SHS
- Share
- 0.8%
Everpure Inc.CL A$272,249,469
- Class
- CL A
- Share
- 0.8%
Amphenol Corp.CL A$270,661,603
- Class
- CL A
- Share
- 0.8%
Linde PLCSHS$262,040,310
- Class
- SHS
- Share
- 0.8%
Onto Innovation Inc.COM$251,811,926
- Class
- COM
- Share
- 0.8%
Borgwarner Inc.COM$251,304,551
- Class
- COM
- Share
- 0.8%
Carlyle Group Inc.COM$249,076,659
- Class
- COM
- Share
- 0.7%
Argenx SESPONSORED ADR$245,489,701
- Class
- SPONSORED ADR
- Share
- 0.7%
Mueller Inds Inc.COM$244,156,078
- Class
- COM
- Share
- 0.7%
Monster Beverage Corp. NewCOM$243,965,632
- Class
- COM
- Share
- 0.7%
F5 Inc.COM$243,865,285
- Class
- COM
- Share
- 0.7%
Credicorp LtdCOM$243,543,600
- Class
- COM
- Share
- 0.7%
Curtiss Wright Corp.COM$240,441,795
- Class
- COM
- Share
- 0.7%
Itau Unibanco Hldg S ASPON ADR REP PFD$231,061,774
- Class
- SPON ADR REP PFD
- Share
- 0.7%
Snowflake Inc.COM SHS$229,326,642
- Class
- COM SHS
- Share
- 0.7%
Twist Bioscience Corp.COM$223,722,231
- Class
- COM
- Share
- 0.7%
Teva Pharmaceutical Inds LtdSPONSORED ADS$223,369,747
- Class
- SPONSORED ADS
- Share
- 0.7%
Unitedhealth Group Inc.COM$217,535,213
- Class
- COM
- Share
- 0.7%
Crowdstrike Hldgs Inc.CL A$214,754,464
- Class
- CL A
- Share
- 0.6%
Regal Rexnord CorporationCOM$212,260,398
- Class
- COM
- Share
- 0.6%
Krystal Biotech Inc.COM$211,908,766
- Class
- COM
- Share
- 0.6%
Carpenter Technology Corp.COM$205,165,302
- Class
- COM
- Share
- 0.6%
Power Integrations Inc.COM$199,516,906
- Class
- COM
- Share
- 0.6%
Nvent Elec PLCSHS$198,064,282
- Class
- SHS
- Share
- 0.6%
Guardant Health Inc.COM$196,737,340
- Class
- COM
- Share
- 0.6%
Halozyme Therapeutics Inc.COM$196,539,884
- Class
- COM
- Share
- 0.6%
Talen Energy Corp.COM$191,230,832
- Class
- COM
- Share
- 0.6%
TransunionCOM$191,080,410
- Class
- COM
- Share
- 0.6%
Cameco Corp.COM$189,330,699
- Class
- COM
- Share
- 0.6%
Sterling Infrastructure Inc.COM$187,762,314
- Class
- COM
- Share
- 0.6%
Costco Wholesale CorporationCOM$186,490,622
- Class
- COM
- Share
- 0.6%
Alignment Healthcare Inc.COM$184,799,005
- Class
- COM
- Share
- 0.6%
C H Robinson Worldwide INCOM NEW$184,252,457
- Class
- COM NEW
- Share
- 0.6%
Seagate Technology Hldngs PLORD SHS$184,167,355
- Class
- ORD SHS
- Share
- 0.6%
Diodes Inc.COM$184,153,156
- Class
- COM
- Share
- 0.6%
Bwx Technologies Inc.COM$183,211,003
- Class
- COM
- Share
- 0.6%
Akamai Technologies Inc.COM$181,507,554
- Class
- COM
- Share
- 0.5%
The share class is shown on a wider screen.
The 50 largest of 403 positions by value, with holdings of the same security combined. The 200 largest are in this firm's machine-readable record. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 1644956
- File number
- 028-17022
- Options
- 0 call, 0 put
- In the 25 largest
- 41.0%
- Prior quarter
- $30,260,249,668 at 31 March 2026
- Positions opened
- 47
- Positions closed
- 57
Common questions
What are William Blair Investment Management’s 13F holdings worth?
$33,254,908,063 across 403 positions for the quarter ended 30 June 2026.
What is William Blair Investment Management’s largest 13F holding?
TAIWAN SEMICONDUCTOR MANUFAC (SPONSORED ADS) was the largest position at $2,357,357,783, or 7.1% of reported 13F value, as of 30 June 2026.
How concentrated is William Blair Investment Management’s 13F portfolio?
The ten largest positions accounted for 28.9% of reported value and the twenty-five largest for 41.0%, across 403 positions as of 30 June 2026.
Does Form 13F show everything William Blair Investment Management manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does William Blair Investment Management file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.