WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Top Portfolio Positions
404 positions ·
$30,335,994,855 total
· as of Mar 31, 2026
| Ticker | Company | Shares | Value (USD) | % of Portfolio | Open |
|---|---|---|---|---|---|
| TSM |
Taiwan Semiconductor Manufacturing Co Ltd
Technology
|
5,518,260 | $1,864,895,967 | 6.15% | |
| NVDA |
Nvidia Corp
Technology
|
8,941,756 | $1,559,442,246 | 5.14% | |
| AAPL |
Apple Inc.
Technology
|
4,812,433 | $1,221,347,371 | 4.03% | |
| MSFT |
Microsoft Corp
Technology
|
2,896,782 | $1,072,301,792 | 3.53% | |
| GOOGL |
Alphabet Inc.
Communication Services
|
2,504,605 | $720,224,213 | 2.37% | |
| AVGO |
Broadcom Inc.
Technology
|
2,201,558 | $681,404,216 | 2.25% | |
| AMZN |
Amazon Com Inc
Consumer Cyclical
|
3,163,629 | $658,889,011 | 2.17% | |
| META |
Meta Platforms, Inc.
Communication Services
|
1,013,122 | $579,637,489 | 1.91% | |
| MA |
Mastercard Inc
Financial Services
|
1,060,651 | $529,964,878 | 1.75% | |
| AZN |
Astrazeneca PLC
Healthcare
|
1,942,155 | $383,031,809 | 1.26% |
Portfolio Trend
25 quarters · across all stocks
Holdings in POWI
Shares Held
Position Value (USD)
16 quarters on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $121,890,662 | 2,380,677 | Shares | Sole | 2026-05-08 | |
| 2025-03-31 | $353,752 | 7,005 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $628,599 | 10,188 | Shares | Sole | 2025-02-10 | |
| 2024-09-30 | $658,384 | 10,268 | Shares | Sole | 2024-11-08 | |
| 2024-06-30 | $574,856 | 8,190 | Shares | Sole | 2024-08-08 | |
| 2024-03-31 | $21,177,440 | 295,981 | Shares | Sole | 2024-05-08 | |
| 2023-12-31 | $23,498,650 | 286,185 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $19,113,899 | 250,477 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $18,978,873 | 200,474 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $18,077,157 | 213,577 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $10,985,711 | 153,175 | Shares | Sole | 2023-02-09 | |
| 2022-09-30 | $9,633,592 | 149,776 | Shares | Sole | 2022-11-09 | |
| 2022-06-30 | $31,185,182 | 415,747 | Shares | Sole | 2022-08-10 | |
| 2022-03-31 | $42,718,158 | 460,921 | Shares | Sole | 2022-05-11 | |
| 2021-12-31 | $35,409,946 | 381,203 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $16,849,978 | 170,219 | Shares | Sole | 2021-11-10 | |
| No 13F history on record for this holder in this stock. | ||||||