William Blair Investment Management reported 403 equity positions with a combined reported value of $33.25B in its Q2 2026 Form 13F filing. The ten largest of those positions account for 28.9%of the filing’s reported value.
| # | Security | CUSIP | Class | Reported value | Shares | Weight |
|---|---|---|---|---|---|---|
| 1 | TAIWAN SEMICONDUCTOR MANUFAC | 874039100 | SPONSORED ADS | $2.36B | 4.94M | 7.09% |
| 2 | NVIDIA CORPORATION | 67066G104 | COM | $1.72B | 8.60M | 5.17% |
| 3 | ALPHABET INC | 02079K305 | CAP STK CL A | $1.14B | 3.19M | 3.43% |
| 4 | APPLE INC | 037833100 | COM | $943.3M | 3.26M | 2.84% |
| 5 | BROADCOM INC | 11135F101 | COM | $776.7M | 2.06M | 2.34% |
| 6 | MICROSOFT CORP | 594918104 | COM | $764.2M | 2.05M | 2.30% |
| 7 | META PLATFORMS INC | 30303M102 | CL A | $535.2M | 950K | 1.61% |
| 8 | AMAZON COM INC | 023135106 | COM | $473.6M | 1.99M | 1.42% |
| 9 | MASTERCARD INCORPORATED | 57636Q104 | CL A | $471.5M | 918K | 1.42% |
| 10 | ADVANCED MICRO DEVICES INC | 007903107 | COM | $443.5M | 764K | 1.33% |
The full 403-position filing, quarter-over-quarter position changes, concentration analysis and cross-fund security search are in the Fund Tracker dashboard.
Open Fund TrackerRock Group holds William Blair Investment Management’s 13F filings for Q2 2026, Q1 2026, Q4 2025, Q3 2025, Q2 2025, Q1 2025, Q4 2024, Q3 2024. Period-over-period comparison — positions added, exited and resized — is available in the dashboard.
Browse all 13F filers on file, or read the Fund Tracker documentation for what Form 13F does and does not disclose.