William Blair Investment Management, Llc
Institutional manager — quarterly 13F holdings, Q ending 2026-06-30
Reported value
$33.25B
Q ending 2026-06-30
Prior quarter
$30.26B
Q ending 2026-03-31
Change
+9.9% QoQ · -11.7% YoY
Positions
403
reported holdings
Largest positions
Top 100 of 403 reported positions by value, Q ending 2026-06-30. A manager can hold shares, calls and puts on the same security at once — such positions are listed as separate rows. Type: Shares = common stock, Put/Call = option positions (valued at the underlying), Principal = debt. Tickers link to stock pages where covered.
| Holding | Ticker | Type | Value ▼ | Shares |
|---|---|---|---|---|
| Taiwan Semiconductor Manufac | TSM | Shares | $2.36B | 4.9M |
| Nvidia Corporation | NVDA | Shares | $1.72B | 8.6M |
| Alphabet Inc | GOOGL | Shares | $1.14B | 3.2M |
| Apple Inc | AAPL | Shares | $943.3M | 3.3M |
| Broadcom Inc | AVGO | Shares | $776.7M | 2.1M |
| Microsoft Corp | MSFT | Shares | $764.2M | 2.0M |
| Meta Platforms Inc | META | Shares | $535.2M | 950K |
| Amazon Com Inc | AMZN | Shares | $473.6M | 2.0M |
| Mastercard Incorporated | MA | Shares | $471.5M | 918K |
| Advanced Micro Devices Inc | AMD | Shares | $443.5M | 764K |
| Applied Matls Inc | AMAT | Shares | $360.0M | 498K |
| Ge Aerospace | GE | Shares | $295.5M | 791K |
| Astrazeneca Plc | Shares | $283.2M | 1.5M | |
| Primo Brands Corporation | PRMB | Shares | $279.3M | 11.4M |
| Everpure Inc | P | Shares | $272.2M | 3.5M |
| Amphenol Corp | APH | Shares | $270.7M | 1.5M |
| Linde Plc | Shares | $262.0M | 505K | |
| Onto Innovation Inc | ONTO | Shares | $251.8M | 665K |
| Borgwarner Inc | BWA | Shares | $251.3M | 3.8M |
| Carlyle Group Inc | CG | Shares | $249.1M | 5.9M |
| Argenx Se | ARGX | Shares | $245.5M | 265K |
| Mueller Inds Inc | MLI | Shares | $244.2M | 2.0M |
| Monster Beverage Corp New | MNST | Shares | $244.0M | 2.5M |
| F5 Inc | FFIV | Shares | $243.9M | 586K |
| Credicorp Ltd | Shares | $243.5M | 625K | |
| Curtiss Wright Corp | CW | Shares | $240.4M | 317K |
| Itau Unibanco Hldg S A | ITUB | Shares | $231.1M | 28.3M |
| Snowflake Inc | SNOW | Shares | $229.3M | 901K |
| Twist Bioscience Corp | TWST | Shares | $223.7M | 2.2M |
| Teva Pharmaceutical Inds Ltd | TEVA | Shares | $223.4M | 6.6M |
| Unitedhealth Group Inc | UNH | Shares | $217.5M | 523K |
| Crowdstrike Hldgs Inc | CRWD | Shares | $214.8M | 281K |
| Regal Rexnord Corporation | RRX | Shares | $212.3M | 891K |
| Krystal Biotech Inc | KRYS | Shares | $211.9M | 570K |
| Carpenter Technology Corp | CRS | Shares | $205.2M | 333K |
| Power Integrations Inc | POWI | Shares | $199.5M | 2.4M |
| Nvent Elec Plc | Shares | $198.1M | 1.2M | |
| Guardant Health Inc | GH | Shares | $196.7M | 1.3M |
| Halozyme Therapeutics Inc | HALO | Shares | $196.5M | 2.5M |
| Talen Energy Corp | TLN | Shares | $191.2M | 498K |
| Transunion | TRU | Shares | $191.1M | 2.6M |
| Cameco Corp | CCJ | Shares | $189.3M | 1.9M |
| Sterling Infrastructure Inc | STRL | Shares | $187.8M | 224K |
| Costco Wholesale Corporation | COST | Shares | $186.5M | 199K |
| Alignment Healthcare Inc | ALHC | Shares | $184.8M | 7.8M |
| C H Robinson Worldwide In | CHRW | Shares | $184.3M | 978K |
| Seagate Technology Hldngs Pl | Shares | $184.2M | 191K | |
| Diodes Inc | DIOD | Shares | $184.2M | 1.7M |
| Bwx Technologies Inc | BWXT | Shares | $183.2M | 941K |
| Akamai Technologies Inc | AKAM | Shares | $181.5M | 1.5M |
| The Baldwin Insurance Grp In | BWIN | Shares | $179.0M | 6.7M |
| Bentley Sys Inc | BSY | Shares | $177.6M | 5.9M |
| Lattice Semiconductor Corp | LSCC | Shares | $177.5M | 1.2M |
| Madrigal Pharmaceuticals Inc | MDGL | Shares | $174.0M | 324K |
| Everest Group Ltd | Shares | $171.4M | 480K | |
| Agilent Technologies Inc | A | Shares | $171.0M | 1.3M |
| Oreilly Automotive Inc | ORLY | Shares | $170.8M | 1.9M |
| Dynatrace Inc | DT | Shares | $169.4M | 3.9M |
| Mirum Pharmaceuticals Inc | MIRM | Shares | $164.5M | 1.4M |
| Healthequity Inc | HQY | Shares | $160.2M | 1.8M |
| Idexx Labs Inc | IDXX | Shares | $157.0M | 298K |
| Servicenow Inc | NOW | Shares | $154.0M | 1.6M |
| Synaptics Inc | SYNA | Shares | $154.0M | 1.2M |
| Texas Instrs Inc | TXN | Shares | $150.9M | 506K |
| Sharkninja Inc | Shares | $150.3M | 987K | |
| West Pharmaceutical Svsc Inc | WST | Shares | $149.8M | 417K |
| Grand Canyon Ed Inc | LOPE | Shares | $148.7M | 1.0M |
| Littelfuse Inc | LFUS | Shares | $146.5M | 322K |
| Canadian Nat Res Ltd Med Ter | CNQ | Shares | $143.7M | 3.6M |
| Reliance Inc | RS | Shares | $142.9M | 382K |
| Totalenergies Se | Shares | $141.4M | 1.8M | |
| Forgent Power Solutions Inc | FPS | Shares | $140.6M | 2.5M |
| Ptc Therapeutics Inc | PTCT | Shares | $140.5M | 1.7M |
| Timken Co | TKR | Shares | $138.8M | 955K |
| Cytokinetics Inc | CYTK | Shares | $136.6M | 1.6M |
| Lincoln Elec Hldgs Inc | LECO | Shares | $134.6M | 507K |
| Eagle Matls Inc | EXP | Shares | $129.8M | 577K |
| Clean Harbors Inc | CLH | Shares | $125.2M | 419K |
| Novanta Inc | NOVT | Shares | $124.3M | 766K |
| Birkenstock Holding Plc | Shares | $123.3M | 2.9M | |
| First Horizon Corporation | FHN | Shares | $123.3M | 4.8M |
| Etsy Inc | ETSY | Shares | $120.4M | 1.6M |
| Millicom Intl Cellular S A | Shares | $118.9M | 1.3M | |
| Diebold Nixdorf Inc | DBD | Shares | $117.3M | 1.4M |
| Garrett Motion Inc | GTX | Shares | $117.1M | 3.2M |
| Encompass Health Corp | EHC | Shares | $116.4M | 1.2M |
| Appfolio Inc | APPF | Shares | $115.7M | 722K |
| Marriott Intl Inc New | MAR | Shares | $111.5M | 301K |
| National Bk Hldgs Corp | NBHC | Shares | $111.0M | 2.5M |
| Chipotle Mexican Grill Inc | CMG | Shares | $110.0M | 3.2M |
| Saia Inc | SAIA | Shares | $109.1M | 259K |
| Repligen Corp | RGEN | Shares | $107.6M | 789K |
| Freshpet Inc | FRPT | Shares | $107.1M | 1.8M |
| Jazz Pharmaceuticals Plc | Shares | $105.3M | 437K | |
| Martin Marietta Matls Inc | MLM | Shares | $104.9M | 182K |
| Knight-Swift Transn Hldgs In | KNX | Shares | $103.6M | 1.3M |
| Weatherford Intl Plc | Shares | $102.8M | 1.3M | |
| Globus Med Inc | GMED | Shares | $101.5M | 1.3M |
| Nu Hldgs Ltd | Shares | $101.5M | 7.6M | |
| Hudbay Minerals Inc | HBM | Shares | $99.5M | 4.2M |
Values as reported in public regulatory filings (USD); holdings are reported quarterly, up to 45 days after quarter end, and may contain reporting errors. Nothing here is investment advice.