William Blair Investment Management, LLC holds a diversified book of 403 stocks worth $33.3B as of Q2 2026 (disclosed Aug 12, 2026, a ~43-day 13F lag). This quarter they opened General Electric and trimmed Taiwan Semiconductor-SP ADR. Their largest long position is Taiwan Semiconductor-SP ADR at 7% of the equity book.
Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
100% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Other tracked managers holding the same core names as William Blair Investment Management, LLC
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| BlackRock, Inc. | 80 / 80 | $1.7T |
| FMR LLC | 80 / 80 | $695.1B |
| JPMORGAN CHASE & CO | 80 / 80 | $367.7B |
| MORGAN STANLEY | 80 / 80 | $353.9B |
| NORTHERN TRUST CORP | 80 / 80 | $219.8B |
| BANK OF AMERICA CORP /DE/ | 80 / 80 | $205.1B |
| GOLDMAN SACHS GROUP INC | 80 / 80 | $176.5B |
| Bank of New York Mellon Corp | 80 / 80 | $151.9B |
Ranked by how many of William Blair Investment Management, LLC's top 80 disclosed names each fund also holds: a cross-fund conviction signal from the latest 13F of every tracked manager.
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Taiwan Semiconductor Manufac SPONSORED ADS | $2.4B | 4.94M | 7.1% | ▼−11% Reduced · −582K sh | |
| 2 | Nvidia Corporation COM | $1.7B | 8.60M | 5.2% | ▼−3.8% Reduced · −343K sh | |
| 3 | Alphabet Inc CAP STK CL A | $1.1B | 3.19M | 3.4% | ▲+27% Added · +686K sh | |
| 4 | Apple Inc COM | $943.3M | 3.26M | 2.8% | ▼−32% Reduced · −1.6M sh | |
| 5 | Broadcom Inc COM | $776.7M | 2.06M | 2.3% | ▼−6.6% Reduced · −145K sh | |
| 6 | Microsoft Corp COM | $764.2M | 2.05M | 2.3% | ▼−29% Reduced · −848K sh | |
| 7 | Meta Platforms Inc CL A | $535.2M | 950.1K | 1.6% | ▼−6.2% Reduced · −63K sh | |
| 8 | Amazon Com Inc COM | $473.6M | 1.99M | 1.4% | ▼−37% Reduced · −1.2M sh | |
| 9 | Mastercard Incorporated CL A | $471.5M | 918.0K | 1.4% | ▼−13% Reduced · −143K sh | |
| 10 | Advanced Micro Devices Inc COM | $443.5M | 763.5K | 1.3% | ▼−27% Reduced · −279K sh | |
| 11 | Applied Matls Inc COM | $360.0M | 497.9K | 1.1% | ▲14× Added · +463K sh | |
| 12 | Ge Aerospace COM NEW | $295.5M | 790.8K | 0.9% | ▲New New position | |
| 13 | AstraZeneca PLC ORD | $283.2M | 1.51M | 0.9% | ▼−22% Reduced · −427K sh | |
| 14 | Primo Brands Corporation CLASS A COM SHS | $279.3M | 11.43M | 0.8% | ▼−12% Reduced · −1.6M sh | |
| 15 | Everpure Inc CL A | $272.2M | 3.46M | 0.8% | ▲+20% Added · +574K sh | |
| 16 | Amphenol Corp CL A | $270.7M | 1.54M | 0.8% | ▲+42% Added · +458K sh | |
| 17 | Linde PLC SHS | $262.0M | 505.0K | 0.8% | ▼−21% Reduced · −131K sh | |
| 18 | Onto Innovation Inc COM | $251.8M | 665.4K | 0.8% | ▼−31% Reduced · −299K sh | |
| 19 | Borgwarner Inc COM | $251.3M | 3.78M | 0.8% | ▲+31% Added · +901K sh | |
| 20 | Carlyle Group Inc COM | $249.1M | 5.91M | 0.7% | ▼−6.1% Reduced · −386K sh | |
| 21 | Argenx SE SPONSORED ADR | $245.5M | 264.6K | 0.7% | ▼−0.5% Reduced · −1K sh | |
| 22 | Mueller Inds Inc COM | $244.2M | 1.99M | 0.7% | ▼−5.8% Reduced · −124K sh | |
| 23 | Monster Beverage Corp New COM | $244.0M | 2.54M | 0.7% | ▼−14% Reduced · −397K sh | |
| 24 | F5 Inc COM | $243.9M | 586.3K | 0.7% | ▼−9.8% Reduced · −64K sh | |
| 25 | Credicorp Ltd COM | $243.5M | 625.1K | 0.7% | ▲+0.4% Added · +2K sh | |
| 26 | Curtiss Wright Corp COM | $240.4M | 317.3K | 0.7% | ▲+37% Added · +85K sh | |
| 27 | Itau Unibanco Hldg S A SPON ADR REP PFD | $231.1M | 28.28M | 0.7% | ▼−11% Reduced · −3.4M sh | |
| 28 | Snowflake Inc COM SHS | $229.3M | 901.1K | 0.7% | ▼−20% Reduced · −226K sh | |
| 29 | Twist Bioscience Corp COM | $223.7M | 2.17M | 0.7% | ▼−59% Reduced · −3.1M sh | |
| 30 | Teva Pharmaceutical Inds Ltd SPONSORED ADS | $223.4M | 6.59M | 0.7% | ▲+362% Added · +5.2M sh | |
| 31 | Unitedhealth Group Inc COM | $217.5M | 523.4K | 0.7% | ▼−22% Reduced · −150K sh | |
| 32 | Crowdstrike Hldgs Inc CL A | $214.8M | 281.4K | 0.6% | ▲New New position | |
| 33 | Regal Rexnord Corporation COM | $212.3M | 891.1K | 0.6% | ▲+6.4% Added · +54K sh | |
| 34 | Krystal Biotech Inc COM | $211.9M | 570.2K | 0.6% | ▲+40% Added · +163K sh | |
| 35 | Carpenter Technology Corp COM | $205.2M | 332.6K | 0.6% | ▼−5.2% Reduced · −18K sh | |
| 36 | Power Integrations Inc COM | $199.5M | 2.38M | 0.6% | ▲+0.1% Added · +1K sh | |
| 37 | Nvent Elec PLC SHS | $198.1M | 1.17M | 0.6% | ▼−5.3% Reduced · −66K sh | |
| 38 | Guardant Health Inc COM | $196.7M | 1.31M | 0.6% | ▲+38% Added · +360K sh | |
| 39 | Halozyme Therapeutics Inc COM | $196.5M | 2.51M | 0.6% | ▼−0.6% Reduced · −15K sh | |
| 40 | Talen Energy Corp COM | $191.2M | 497.7K | 0.6% | ▼−5.2% Reduced · −28K sh | |
| 41 | Transunion COM | $191.1M | 2.65M | 0.6% | ▼−8.4% Reduced · −242K sh | |
| 42 | Cameco Corp COM | $189.3M | 1.86M | 0.6% | ▲+10% Added · +176K sh | |
| 43 | Sterling Infrastructure Inc COM | $187.8M | 223.7K | 0.6% | ▼−31% Reduced · −100K sh | |
| 44 | Costco Wholesale Corporation COM | $186.5M | 199.4K | 0.6% | ▼−34% Reduced · −103K sh | |
| 45 | Alignment Healthcare Inc COM | $184.8M | 7.76M | 0.6% | ▲+49% Added · +2.5M sh | |
| 46 | C H Robinson Worldwide In COM NEW | $184.3M | 978.3K | 0.6% | ▼−6.1% Reduced · −63K sh | |
| 47 | Seagate Technology HLDNGS PL ORD SHS | $184.2M | 190.8K | 0.6% | ▲New New position | |
| 48 | Diodes Inc COM | $184.2M | 1.68M | 0.6% | ▲+281% Added · +1.2M sh | |
| 49 | BWX Technologies Inc COM | $183.2M | 941.2K | 0.6% | ▼−4.1% Reduced · −41K sh | |
| 50 | Akamai Technologies Inc COM | $181.5M | 1.54M | 0.5% | ▼−5.2% Reduced · −84K sh |
The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This fund page is the Follow view. The Build view lets your agent pull holdings, quarter changes, overlap, and source filings through API or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1644956/holdings"
Use Arkolith to show WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q2 2026 | Jun 30, 2026 | Aug 12, 2026 | 403 | $33.3B | 13F-HR |
| Q1 2026 | Mar 31, 2026 | May 8, 2026 | 413 | $30.3B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Feb 9, 2026 | 413 | $35.9B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Nov 12, 2025 | 414 | $38.7B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 29, 2025 | 417 | $37.7B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | May 9, 2025 | 423 | $35.6B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 10, 2025 | 433 | $40.9B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Nov 8, 2024 | 412 | $40.5B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 8, 2024 | 411 | $38.1B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 8, 2024 | 410 | $38.7B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 9, 2024 | 406 | $34.4B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Nov 9, 2023 | 398 | $30.1B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Aug 11, 2023 | 395 | $31.2B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | May 12, 2023 | 393 | $28.7B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Feb 9, 2023 | 401 | $26.1B | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 9, 2022 | 387 | $25.3B | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 10, 2022 | 403 | $27.0B | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 11, 2022 | 441 | $33.5B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 14, 2022 | 427 | $37.0B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Nov 10, 2021 | 431 | $35.5B | 13F-HR |
| Q2 2021 | Jun 30, 2021 | Aug 12, 2021 | 465 | $31.9B | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 13, 2021 | 367 | $30.9B | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 9, 2021 | 356 | $30.0B | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 6, 2020 | 343 | $25.7B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.