BLAIR WILLIAM & CO/IL portfolio
Managed by . 1,922 reported positions worth $34.9B as of 2026-03-31, filed with the SEC on 2026-05-08. Parsed from the filing itself, not a reseller.
Every position on this page is a snapshot of 2026-03-31. It was already 38 days old on 2026-05-08, the day it first became public. Today it is 134 days old.
That lag is the law, not a service level — Rule 13f-1 gives managers 45 days after quarter end to file, and no product can shorten it. A fund can have sold every share below before you read this sentence. Treat it as a record of what happened, never as a position you can follow.
Positions opened and closed
Against its 2025-12-31 filing. This is the part worth reading — the holdings table below is mostly years old.
| Ticker | Issuer | Value | Shares | % of book |
|---|---|---|---|---|
| AZN | ASTRAZENECA PLC | $19.8M | 100,622 | 0.06% |
| SIMO | SILICON MOTION TECHNOLOGY CO | $11.6M | 103,179 | 0.03% |
| GH | GUARDANT HEALTH INC | $9.6M | 103,644 | 0.03% |
| SLDB | SOLID BIOSCIENCES INC | $4.7M | 651,216 | 0.01% |
| RYN | RAYONIER INC | $2.7M | 130,939 | 0.01% |
| EXPO | EXPONENT INC | $1.9M | 28,806 | 0.01% |
| RLI | RLI CORP | $1.8M | 31,573 | 0.01% |
| ICFI | ICF INTL INC | $1.6M | 23,784 | 0.00% |
| BLDR | BUILDERS FIRSTSOURCE INC | $1.1M | 13,450 | 0.00% |
| SUNB | SUNBELT RENTALS HOLDINGS INC | $1.1M | 16,200 | 0.00% |
| PINE | ALPINE INCOME PPTY TR INC | $1.0M | 57,515 | 0.00% |
| DFTX | DEFINIUM THERAPEUTICS INC | $1.0M | 53,695 | 0.00% |
| AOM | ISHARES TR | $993,870 | 20,981 | 0.00% |
| MANU | MANCHESTER UTD PLC NEW | $966,410 | 57,456 | 0.00% |
| DIOD | DIODES INC | $955,981 | 14,005 | 0.00% |
| BATRA | ATLANTA BRAVES HLDGS INC | $924,329 | 19,604 | 0.00% |
| MNR | MACH NATURAL RESOURCES LP | $874,006 | 62,429 | 0.00% |
| AR | ANTERO RESOURCES CORP | $807,202 | 19,020 | 0.00% |
| NOG | NORTHERN OIL & GAS INC | $800,317 | 27,380 | 0.00% |
| CRL | CHARLES RIV LABS INTL INC | $789,107 | 4,575 | 0.00% |
| ALHC | ALIGNMENT HEALTHCARE INC | $747,969 | 42,450 | 0.00% |
| TRP | TC ENERGY CORP | $675,762 | 10,795 | 0.00% |
| HALO | HALOZYME THERAPEUTICS INC | $659,420 | 10,203 | 0.00% |
| USO | UNITED STS OIL FD LP | $639,940 | 5,029 | 0.00% |
| MBWM | MERCANTILE BK CORP | $615,545 | 12,189 | 0.00% |
| Ticker | Issuer | Was worth | Shares | % of book |
|---|---|---|---|---|
| DVAX | DYNAVAX TECHNOLOGIES CORP | $27.4M | 1,781,442 | 0.00% |
| AZNN | ASTRAZENECA PLC | $19.4M | 211,184 | 0.00% |
| CYBR | CYBERARK SOFTWARE LTD | $14.5M | 32,592 | 0.00% |
| EXK | EXACT SCIENCES CORP | $13.1M | 128,517 | 0.00% |
| QLYS | QUALYS INC | $6.4M | 47,958 | 0.00% |
| GXO | GXO LOGISTICS INCORPORATED | $4.8M | 91,791 | 0.00% |
| 8QR | CONFLUENT INC | $4.8M | 159,290 | 0.00% |
| DSGR | DISTRIBUTION SOLUTIONS GRP I | $3.1M | 112,870 | 0.00% |
| 8TG | THERMON GROUP HLDGS INC | $2.3M | 61,065 | 0.00% |
| BRSP | BRIGHTSPIRE CAPITAL INC | $2.1M | 370,564 | 0.00% |
| MRCC | MONROE CAP CORP | $2.0M | 309,750 | 0.00% |
| BRO | BROWN & BROWN INC | $1.9M | 23,545 | 0.00% |
| HO1 | HOLOGIC INC | $1.5M | 20,073 | 0.00% |
| BKV | BKV CORP | $1.1M | 42,345 | 0.00% |
| CRK | COMSTOCK RES INC | $940,459 | 40,572 | 0.00% |
| JAMF | JAMF HLDG CORP | $937,436 | 72,055 | 0.00% |
| CWEN | CLEARWAY ENERGY INC | $792,249 | 23,820 | 0.00% |
| SDA | SEALED AIR CORP NEW | $696,759 | 16,818 | 0.00% |
| FLYW | FLYWIRE CORPORATION | $580,857 | 41,021 | 0.00% |
| TWFG | TWFG INC | $572,408 | 19,896 | 0.00% |
| RVTY | REVVITY INC | $568,503 | 5,876 | 0.00% |
| SMWB | SIMILARWEB LTD | $532,120 | 71,044 | 0.00% |
| ACM | AECOM | $491,197 | 5,153 | 0.00% |
| PDD | PDD HOLDINGS INC | $462,547 | 4,079 | 0.00% |
| BCS | BARCLAYS PLC | $436,669 | 17,158 | 0.00% |
| Ticker | Issuer | Value | Shares | % of book | Shares Δ |
|---|---|---|---|---|---|
| GEV | GE VERNOVA INC | $580.1M | 664,603 | 1.66% | +2% |
| FAST | FASTENAL CO | $342.1M | 7,373,707 | 0.98% | +5% |
| RSP | INVESCO EXCHANGE TRADED FD T | $322.5M | 1,680,604 | 0.92% | +206% |
| VEU | VANGUARD INTL EQUITY INDEX F | $313.1M | 4,168,625 | 0.90% | +54% |
| AVGO | BROADCOM INC | $284.2M | 918,328 | 0.81% | +2% |
| VEA | VANGUARD TAX-MANAGED FDS | $247.5M | 3,862,086 | 0.71% | +23% |
| VOO | VANGUARD INDEX FDS | $237.5M | 397,380 | 0.68% | +6% |
| BRK/B | BERKSHIRE HATHAWAY INC DEL | $237.4M | 495,322 | 0.68% | +11% |
| VTV | VANGUARD INDEX FDS | $228.8M | 1,165,912 | 0.66% | +30% |
| PANW | PALO ALTO NETWORKS INC | $209.2M | 1,304,858 | 0.60% | +4% |
| BA | BOEING CO | $183.5M | 922,102 | 0.53% | +36% |
| QQQ | INVESCO QQQ TR | $179.5M | 311,016 | 0.51% | +11% |
| NFLX | NETFLIX INC. | $169.6M | 1,763,451 | 0.49% | +18% |
| GLD | SPDR GOLD TR | $166.4M | 386,735 | 0.48% | +52% |
| IWM | ISHARES TR | $155.8M | 628,228 | 0.45% | +12% |
| Ticker | Issuer | Value | Shares | % of book | Shares Δ |
|---|---|---|---|---|---|
| MCHI | ISHARES TR | $995 | 18 | 0.00% | -99% |
| STKL | SUNOPTA INC | $92,904 | 14,337 | 0.00% | -99% |
| CWAN | CLEARWATER ANALYTICS HLDGS I | $1.8M | 77,582 | 0.01% | -98% |
| VCLT | VANGUARD SCOTTSDALE FDS | $897 | 12 | 0.00% | -97% |
| TRU | TRANSUNION | $789,665 | 11,413 | 0.00% | -96% |
| BILL | BILL HOLDINGS INC | $475,608 | 12,418 | 0.00% | -95% |
| WING | WINGSTOP INC | $1.0M | 6,737 | 0.00% | -93% |
| ONON | ON HLDG AG | $776,847 | 22,835 | 0.00% | -91% |
| ZNOV | INNOVATOR ETFS TRUST | $211,550 | 7,968 | 0.00% | -90% |
| XT | ISHARES TR | $70,807 | 1,039 | 0.00% | -89% |
| IOT | SAMSARA INC | $4.7M | 149,738 | 0.01% | -89% |
| IT | GARTNER INC | $2.3M | 14,506 | 0.01% | -88% |
| IETC | ISHARES U S ETF TR | $42,334 | 479 | 0.00% | -88% |
| BL | BLACKLINE INC | $391,201 | 10,573 | 0.00% | -88% |
| DSGX | DESCARTES SYS GROUP INC | $2.1M | 29,360 | 0.01% | -87% |
Largest 150 of 1,922 holdings
| Ticker | Issuer | Value | Shares | % of book | Shares Δ |
|---|---|---|---|---|---|
| AAPL | APPLE INC | $1.5B | 5,930,914 | 4.31% | — |
| MSFT | MICROSOFT CORP | $1.3B | 3,498,110 | 3.71% | — |
| AMZN | AMAZON COM INC | $1.3B | 6,057,938 | 3.62% | — |
| NVDA | NVIDIA CORPORATION | $946.6M | 5,427,875 | 2.71% | — |
| GOOG | ALPHABET INC | $870.8M | 3,035,765 | 2.50% | — |
| GOOGL | ALPHABET INC | $700.5M | 2,436,117 | 2.01% | — |
| JPM | JPMORGAN CHASE & CO | $678.7M | 2,307,253 | 1.94% | — |
| GEV | GE VERNOVA INC | $580.1M | 664,603 | 1.66% | — |
| V | VISA INC | $557.5M | 1,844,583 | 1.60% | — |
| SPY | STATE STR SPDR S&P 500 ETF T | $549.7M | 845,294 | 1.58% | — |
| IDXX | IDEXX LABS INC | $531.7M | 946,336 | 1.52% | — |
| COST | COSTCO WHOLESALE CORPORATION | $519.4M | 521,277 | 1.49% | — |
| MA | MASTERCARD INCORPORATED | $461.4M | 923,405 | 1.32% | — |
| META | META PLATFORMS INC | $412.9M | 721,720 | 1.18% | — |
| FAST | FASTENAL CO | $342.1M | 7,373,707 | 0.98% | — |
| RSP | INVESCO EXCHANGE TRADED FD T | $322.5M | 1,680,604 | 0.92% | — |
| APH | AMPHENOL CORP | $318.4M | 2,520,319 | 0.91% | — |
| IVV | ISHARES TR | $317.4M | 485,839 | 0.91% | — |
| VEU | VANGUARD INTL EQUITY INDEX F | $313.1M | 4,168,625 | 0.90% | — |
| LLY | ELI LILLY & CO | $298.0M | 324,018 | 0.85% | — |
| WMT | WALMART INC | $295.1M | 2,374,282 | 0.85% | — |
| BWXT | BWX TECHNOLOGIES INC | $294.1M | 1,438,125 | 0.84% | — |
| ABBV | ABBVIE INC | $290.2M | 1,334,109 | 0.83% | — |
| AVGO | BROADCOM INC | $284.2M | 918,328 | 0.81% | — |
| SYK | STRYKER CORPORATION | $278.5M | 847,701 | 0.80% | — |
| ICE | INTERCONTINENTAL EXCHANGE IN | $250.6M | 1,593,628 | 0.72% | — |
| HD | HOME DEPOT INC | $250.4M | 761,419 | 0.72% | — |
| VEA | VANGUARD TAX-MANAGED FDS | $247.5M | 3,862,086 | 0.71% | — |
| DHR | DANAHER CORP DEL | $245.9M | 1,296,804 | 0.70% | — |
| PGR | PROGRESSIVE CORP | $241.8M | 1,219,749 | 0.69% | — |
| VOO | VANGUARD INDEX FDS | $237.5M | 397,380 | 0.68% | — |
| BRK/B | BERKSHIRE HATHAWAY INC DEL | $237.4M | 495,322 | 0.68% | — |
| UBER | UBER TECHNOLOGIES INC | $237.3M | 3,299,596 | 0.68% | — |
| JNJ | JOHNSON & JOHNSON | $233.6M | 955,632 | 0.67% | — |
| ECL | ECOLAB INC | $230.5M | 866,411 | 0.66% | — |
| VTV | VANGUARD INDEX FDS | $228.8M | 1,165,912 | 0.66% | — |
| WSO | WATSCO INC | $212.0M | 582,700 | 0.61% | — |
| AXP | AMERICAN EXPRESS CO | $209.9M | 693,767 | 0.60% | — |
| PANW | PALO ALTO NETWORKS INC | $209.2M | 1,304,858 | 0.60% | — |
| ISRG | INTUITIVE SURGICAL INC | $196.0M | 425,228 | 0.56% | — |
| TDG | TRANSDIGM GROUP INC | $192.7M | 166,248 | 0.55% | — |
| NOW | SERVICENOW INC | $188.3M | 1,800,988 | 0.54% | — |
| VEEV | VEEVA SYS INC | $187.5M | 1,067,576 | 0.54% | — |
| BA | BOEING CO | $183.5M | 922,102 | 0.53% | — |
| QQQ | INVESCO QQQ TR | $179.5M | 311,016 | 0.51% | — |
| P | EVERPURE INC | $172.3M | 2,918,046 | 0.49% | — |
| NFLX | NETFLIX INC. | $169.6M | 1,763,451 | 0.49% | — |
| GLD | SPDR GOLD TR | $166.4M | 386,735 | 0.48% | — |
| CTAS | CINTAS CORP | $164.7M | 973,553 | 0.47% | — |
| EXMOC | EXXON MOBIL CORP | $160.6M | 946,386 | 0.46% | — |
| IWM | ISHARES TR | $155.8M | 628,228 | 0.45% | — |
| CVX | CHEVRON CORPORATION | $148.1M | 715,986 | 0.42% | — |
| VIG | VANGUARD SPECIALIZED FUNDS | $147.9M | 687,771 | 0.42% | — |
| GWRE | GUIDEWIRE SOFTWARE INC | $145.9M | 975,296 | 0.42% | — |
| ANET | ARISTA NETWORKS INC | $141.3M | 1,151,227 | 0.41% | — |
| ABT | ABBOTT LABORATORIES | $136.3M | 1,327,761 | 0.39% | — |
| AON | AON PLC | $136.1M | 421,605 | 0.39% | — |
| BX | BLACKSTONE INC | $135.5M | 1,178,612 | 0.39% | — |
| CPRT | COPART INC | $135.2M | 4,070,990 | 0.39% | — |
| AAON | AAON INC | $134.2M | 1,622,203 | 0.38% | — |
| GS | GOLDMAN SACHS GROUP INC | $132.2M | 156,265 | 0.38% | — |
| PG | PROCTER & GAMBLE CO | $129.1M | 893,933 | 0.37% | — |
| IBM | INTERNATIONAL BUSINESS MACHS | $125.7M | 518,457 | 0.36% | — |
| UNP | UNION PAC CORP | $124.9M | 514,829 | 0.36% | — |
| PWR | QUANTA SVCS INC | $124.0M | 225,850 | 0.36% | — |
| DXCM | DEXCOM INC | $121.0M | 1,927,387 | 0.35% | — |
| ROL | ROLLINS INC | $121.0M | 2,265,013 | 0.35% | — |
| VTI | VANGUARD INDEX FDS | $119.5M | 372,371 | 0.34% | — |
| IUSV | ISHARES TR | $119.2M | 1,165,952 | 0.34% | — |
| RBC | RBC BEARINGS INC | $118.3M | 217,833 | 0.34% | — |
| LIN | LINDE PLC | $115.6M | 233,182 | 0.33% | — |
| CW | CURTISS WRIGHT CORP | $113.8M | 167,027 | 0.33% | — |
| IWF | ISHARES TR | $113.4M | 266,026 | 0.33% | — |
| MU | MICRON TECHNOLOGY INC | $112.3M | 332,311 | 0.32% | — |
| WM | WASTE MGMT INC DEL | $111.3M | 484,303 | 0.32% | — |
| TSLA | TESLA INC | $110.1M | 296,041 | 0.32% | — |
| VUG | VANGUARD INDEX FDS | $109.4M | 250,430 | 0.31% | — |
| MRK | MERCK & CO INC | $108.5M | 901,789 | 0.31% | — |
| MCD | MCDONALDS CORP | $108.2M | 348,243 | 0.31% | — |
| KO | COCA COLA CO | $107.7M | 1,415,735 | 0.31% | — |
| JLL | JONES LANG LASALLE INC | $102.7M | 337,417 | 0.29% | — |
| ORLY | OREILLY AUTOMOTIVE INC | $101.9M | 1,104,400 | 0.29% | — |
| ROK | ROCKWELL AUTOMATION INC | $101.9M | 284,067 | 0.29% | — |
| LYV | LIVE NATION ENTERTAINMENT IN | $101.0M | 662,081 | 0.29% | — |
| GD | GENERAL DYNAMICS CORP | $100.2M | 292,035 | 0.29% | — |
| CRWD | CROWDSTRIKE HLDGS INC | $98.5M | 252,379 | 0.28% | — |
| AME | AMETEK INC | $98.1M | 457,447 | 0.28% | — |
| ZTS | ZOETIS INC | $94.0M | 795,297 | 0.27% | — |
| ITW | ILLINOIS TOOL WKS INC | $93.8M | 360,320 | 0.27% | — |
| EFA | ISHARES TR | $93.1M | 958,805 | 0.27% | — |
| HEI | HEICO CORP NEW | $92.4M | 336,799 | 0.26% | — |
| FANG | DIAMONDBACK ENERGY INC | $88.1M | 445,338 | 0.25% | — |
| NDAQ | NASDAQ INC | $87.1M | 1,026,010 | 0.25% | — |
| TMO | THERMO FISHER SCIENTIFIC INC | $85.0M | 172,953 | 0.24% | — |
| PEP | PEPSICO INC | $84.9M | 546,566 | 0.24% | — |
| SBUX | STARBUCKS CORP | $84.1M | 938,548 | 0.24% | — |
| CAT | CATERPILLAR INC | $84.0M | 118,501 | 0.24% | — |
| SCHW | SCHWAB CHARLES CORP | $83.7M | 890,345 | 0.24% | — |
| IEFA | ISHARES TR | $83.6M | 922,976 | 0.24% | — |
| DE | DEERE & CO | $83.2M | 147,623 | 0.24% | — |
| ITOT | ISHARES TR | $82.3M | 577,496 | 0.24% | — |
| AMT | AMERICAN TOWER CORP | $81.1M | 470,128 | 0.23% | — |
| TYL | TYLER TECHNOLOGIES INC | $77.8M | 227,378 | 0.22% | — |
| SHOP | SHOPIFY INC | $74.4M | 627,424 | 0.21% | — |
| RTX | RTX CORPORATION | $74.2M | 384,627 | 0.21% | — |
| IUSG | ISHARES TR | $74.2M | 478,278 | 0.21% | — |
| IRTC | IRHYTHM HOLDINGS INC | $74.2M | 628,385 | 0.21% | — |
| CRM | SALESFORCE INC | $72.6M | 389,008 | 0.21% | — |
| VRSK | VERISK ANALYTICS INC | $72.1M | 380,106 | 0.21% | — |
| IWV | ISHARES TR | $72.0M | 194,240 | 0.21% | — |
| MRVL | MARVELL TECHNOLOGY INC | $71.7M | 723,976 | 0.21% | — |
| WAB | WABTEC | $70.9M | 283,859 | 0.20% | — |
| MCK | MCKESSON CORP | $69.3M | 80,042 | 0.20% | — |
| GNRC | GENERAC HLDGS INC | $67.7M | 346,830 | 0.19% | — |
| HONGBP | HONEYWELL INTL INC | $66.9M | 295,831 | 0.19% | — |
| MDB | MONGODB INC | $66.3M | 270,982 | 0.19% | — |
| INTU | INTUIT | $66.0M | 152,554 | 0.19% | — |
| ACN | ACCENTURE PLC IRELAND | $64.7M | 326,073 | 0.19% | — |
| CSCO | CISCO SYS INC | $63.9M | 823,801 | 0.18% | — |
| TJX | TJX COS INC NEW | $63.0M | 394,646 | 0.18% | — |
| QCOM | QUALCOMM INC | $62.7M | 486,969 | 0.18% | — |
| ULS | UL SOLUTIONS INC | $62.2M | 725,672 | 0.18% | — |
| SPGI | S&P GLOBAL INC | $60.9M | 143,223 | 0.17% | — |
| LOW | LOWES COS INC | $60.6M | 256,414 | 0.17% | — |
| CME | CME GROUP INC | $60.4M | 204,534 | 0.17% | — |
| RDVY | FIRST TR EXCHANGE TRADED FD | $60.1M | 880,823 | 0.17% | — |
| GWW | WW GRAINGER INC | $59.4M | 54,418 | 0.17% | — |
| SDVY | FIRST TR EXCHANGE TRADED FD | $58.4M | 1,480,558 | 0.17% | — |
| GE | GE AEROSPACE | $57.2M | 201,509 | 0.16% | — |
| BLK | BLACKROCK INC | $57.0M | 59,288 | 0.16% | — |
| APP | APPLOVIN CORP | $55.7M | 139,951 | 0.16% | — |
| IWD | ISHARES TR | $55.5M | 259,648 | 0.16% | — |
| RYAN | RYAN SPECIALTY HOLDINGS INC | $55.4M | 1,641,580 | 0.16% | — |
| EPD | ENTERPRISE PRODS PARTNERS L | $55.0M | 1,454,357 | 0.16% | — |
| AMGN | AMGEN INC | $54.9M | 155,998 | 0.16% | — |
| RBA | RB GLOBAL INC | $54.7M | 570,387 | 0.16% | — |
| ALL | ALLSTATE CORP | $53.7M | 258,779 | 0.15% | — |
| MSI | MOTOROLA SOLUTIONS INC | $53.3M | 122,743 | 0.15% | — |
| MDLN | MEDLINE INC | $51.9M | 1,165,430 | 0.15% | — |
| ORCL | ORACLE CORP | $51.7M | 351,104 | 0.15% | — |
| EMR | EMERSON ELEC CO | $51.1M | 389,990 | 0.15% | — |
| BAC | BANK AMERICA CORP | $50.8M | 1,042,103 | 0.15% | — |
| IJR | ISHARES TR | $50.1M | 402,792 | 0.14% | — |
| COIN | COINBASE GLOBAL INC | $49.7M | 284,790 | 0.14% | — |
| SPMD | SPDR SERIES TRUST | $49.7M | 838,805 | 0.14% | — |
| GILD | GILEAD SCIENCES INC | $47.4M | 340,345 | 0.14% | — |
| KLAC | KLA CORP | $47.2M | 32,080 | 0.14% | — |
| IAU | ISHARES GOLD TR | $46.7M | 530,161 | 0.13% | — |
| MDY | STATE STR SPDR S&P MIDCAP 40 | $46.7M | 75,677 | 0.13% | — |
| TSM | TAIWAN SEMICONDUCTOR MANUFAC | $46.6M | 137,755 | 0.13% | — |
This table is the 150 largest positions by value, out of 1,922 reported. The search box only searches what is on this page — a name absent from it may still be in the filing further down the book. The full info table is here.
Rows are aggregated by CUSIP — a manager files the same security multiple times when different internal desks hold it. Tickers link to our own backtest of that asset where we cover it.
This page was built from one document: the 2026-03-31 Form 13F info table filed by BLAIR WILLIAM & CO/IL (CIK 902367, accession 0001104659-26-057897). Every other 13F site is reading the same file.
If anything here disagrees with it, the filing wins — and we would want to know. All 13F filings by this manager
A 13F is a long-only equity snapshot, and the holes in it are structural. Anyone selling you this data as "what the smart money is doing" is selling you one leg of a position:
- No short positions. None, ever. A fund shown here as bullish may be net short the same name through a book you cannot see.
- No cash, bonds, FX, commodities or non-US listings. A macro fund's entire thesis can be invisible.
- No intra-quarter round trips. Bought and sold inside the same quarter means it never appears at all.
- Options are notional, not ownership. We keep puts and calls in a separate bucket rather than adding their notional into a fund's book size, which is how a $2B fund gets reported as a $20B one.
- Confidential treatment. Managers can ask the SEC to withhold a position while they build it. Those holdings are legally absent from the filing, so a "new" position may be months old.
Tested and published by IndicatorEdge · backtest grid generated 2026-06-25 · base rates recomputed 2026-07-31 · how we test
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