BLAIR WILLIAM & CO/IL — 13F Holdings & Portfolio
CIK 902367 · latest 13F-HR filed 2026-08-11
BLAIR WILLIAM & CO/IL manages $38.39B in 13F-reported U.S. long-equity assets across 2,054 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are AAPL (4.31%), AMZN (3.64%), MSFT (3.34%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 167 new positions, exited 91, added to 1,058, and trimmed 440.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$38.39B
Long-equity book
2,054
Distinct positions
2026-06-30
Filed 2026-08-11
+167 / −91 / ↑1058 / ↓440
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
| Name | Title / Status | Ownership | Type |
|---|
Quarter-over-quarter changes
Share-count changes vs the prior 13F.
Top Adds (vs prior quarter)
- MICRON TECHNOLOGY INC$252.3M +224.8%
- PALO ALTO NETWORKS INC$209.1M +99.9%
- GE VERNOVA INC$194.9M +33.6%
- ALPHABET INC$172.8M +19.8%
- ALPHABET INC$158.1M +22.6%
Top Trims
- INTERCONTINENTAL EXCHANGE IN-$92.6M -36.9%
- NETFLIX INC.-$77.8M -45.9%
- COPART INC-$74.5M -55.1%
- STRYKER CORPORATION-$63.1M -22.6%
- DANAHER CORP DEL-$60.9M -24.8%
New Positions
- HONEYWELL INTL INC$101.7M
- HONEYWELL AEROSPACE INC$100.4M
- PATTERN GROUP INC$17.7M
- SPACE EXPLORATION TECHN CORP$10.2M
- CARDINAL INFRASTRUCTURE GROU$9.2M
Exited Positions
- EXXON MOBIL CORP$160.6M
- HONEYWELL INTL INC$66.9M
- HURON CONSULTING GROUP INC$6.6M
- PRESTIGE CONSMR HEALTHCARE I$6.3M
- DUPONT DE NEMOURS INC$3.5M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | APPLE INC | AAPL | 037833100 | $1.66B | 4.31% | 5,722,792 | SH |
| 2 | AMAZON COM INC | AMZN | 023135106 | $1.40B | 3.64% | 5,870,301 | SH |
| 3 | MICROSOFT CORP | MSFT | 594918104 | $1.28B | 3.34% | 3,437,794 | SH |
| 4 | NVIDIA CORPORATION | NVDA | 67066G104 | $1.07B | 2.79% | 5,356,883 | SH |
| 5 | ALPHABET INC | GOOG | 02079K107 | $1.04B | 2.72% | 2,953,724 | SH |
| 6 | ALPHABET INC | GOOGL | 02079K305 | $856.8M | 2.23% | 2,397,463 | SH |
| 7 | GE VERNOVA INC | GEV | 36828A101 | $775.0M | 2.02% | 659,673 | SH |
| 8 | JPMORGAN CHASE & CO | JPM | 46625H100 | $743.2M | 1.94% | 2,270,360 | SH |
| 9 | STATE STR SPDR S&P 500 ETF T | SPY | 78462F103 | $633.3M | 1.65% | 848,034 | SH |
| 10 | VISA INC | V | 92826C839 | $631.8M | 1.65% | 1,841,604 | SH |
| 11 | COSTCO WHOLESALE CORPORATION | COST | 22160K105 | $490.3M | 1.28% | 524,141 | SH |
| 12 | IDEXX LABS INC | IDXX | 45168D104 | $483.2M | 1.26% | 917,868 | SH |
| 13 | AMPHENOL CORP | APH | 032095101 | $441.1M | 1.15% | 2,501,607 | SH |
| 14 | MASTERCARD INCORPORATED | MA | 57636Q104 | $431.6M | 1.12% | 840,437 | SH |
| 15 | INVESCO EXCHANGE TRADED FD T | RSP | 46137V357 | $421.8M | 1.10% | 1,982,392 | SH |
| 16 | PALO ALTO NETWORKS INC | PANW | 697435105 | $418.3M | 1.09% | 1,226,519 | SH |
| 17 | ELI LILLY & CO | LLY | 532457108 | $416.3M | 1.08% | 347,098 | SH |
| 18 | META PLATFORMS INC | META | 30303M102 | $376.8M | 0.98% | 669,007 | SH |
| 19 | VANGUARD INTL EQUITY INDEX F | VEU | 922042775 | $375.1M | 0.98% | 4,479,218 | SH |
| 20 | MICRON TECHNOLOGY INC | MU | 595112103 | $364.6M | 0.95% | 315,878 | SH |
| 21 | ISHARES TR | IVV | 464287200 | $363.0M | 0.95% | 484,704 | SH |
| 22 | FASTENAL CO | FAST | 311900104 | $355.8M | 0.93% | 7,407,059 | SH |
| 23 | BROADCOM INC | AVGO | 11135F101 | $349.6M | 0.91% | 925,572 | SH |
| 24 | ABBVIE INC | ABBV | 00287Y109 | $324.1M | 0.84% | 1,287,857 | SH |
| 25 | VANGUARD TAX-MANAGED FDS | VEA | 921943858 | $305.7M | 0.80% | 4,291,023 | SH |
| 26 | BWX TECHNOLOGIES INC | BWXT | 05605H100 | $303.0M | 0.79% | 1,556,417 | SH |
| 27 | VANGUARD INDEX FDS | VOO | 922908363 | $288.0M | 0.75% | 419,372 | SH |
| 28 | ARISTA NETWORKS INC | ANET | 040413205 | $272.6M | 0.71% | 1,604,716 | SH |
| 29 | VANGUARD INDEX FDS | VTV | 922908744 | $268.6M | 0.70% | 1,232,497 | SH |
| 30 | INVESCO QQQ TR | QQQ | 46090E103 | $264.5M | 0.69% | 359,219 | SH |
| 31 | WALMART INC | WMT | 931142103 | $257.2M | 0.67% | 2,270,879 | SH |
| 32 | HOME DEPOT INC | HD | 437076102 | $246.0M | 0.64% | 697,590 | SH |
| 33 | JOHNSON & JOHNSON | JNJ | 478160104 | $242.9M | 0.63% | 956,262 | SH |
| 34 | BERKSHIRE HATHAWAY INC DEL | BRK.B | 084670702 | $242.0M | 0.63% | 483,586 | SH |
| 35 | EVERPURE INC | P | 74624M102 | $240.2M | 0.63% | 3,048,094 | SH |
| 36 | ECOLAB INC | ECL | 278865100 | $238.0M | 0.62% | 854,294 | SH |
| 37 | WATSCO INC | WSO | 942622200 | $235.0M | 0.61% | 564,024 | SH |
| 38 | AMERICAN EXPRESS CO | AXP | 025816109 | $230.1M | 0.60% | 680,321 | SH |
| 39 | PROGRESSIVE CORP | PGR | 743315103 | $225.9M | 0.59% | 1,034,104 | SH |
| 40 | SERVICENOW INC | NOW | 81762P102 | $222.1M | 0.58% | 2,236,902 | SH |
| 41 | TRANSDIGM GROUP INC | TDG | 893641100 | $219.7M | 0.57% | 164,960 | SH |
| 42 | STRYKER CORPORATION | SYK | 863667101 | $215.5M | 0.56% | 684,392 | SH |
| 43 | ISHARES TR | IWM | 464287655 | $210.6M | 0.55% | 701,051 | SH |
| 44 | CROWDSTRIKE HLDGS INC | CRWD | 22788C105 | $207.4M | 0.54% | 271,719 | SH |
| 45 | UBER TECHNOLOGIES INC | UBER | 90353T100 | $201.7M | 0.53% | 2,794,590 | SH |
| 46 | VANGUARD INDEX FDS | VTI | 922908769 | $195.6M | 0.51% | 528,525 | SH |
| 47 | AAON INC | AAON | 000360206 | $194.5M | 0.51% | 1,533,434 | SH |
| 48 | BOEING CO | BA | 097023105 | $190.1M | 0.50% | 878,396 | SH |
| 49 | DANAHER CORP DEL | DHR | 235851102 | $185.0M | 0.48% | 971,095 | SH |
| 50 | CINTAS CORP | CTAS | 172908105 | $180.9M | 0.47% | 1,063,530 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-11 | $38.39B | 2,054 | 0001104659-26-093821 |
| 2026-03-31 | 2026-05-08 | $34.90B | 1,922 | 0001104659-26-057897 |
| 2025-12-31 | 2026-02-17 | $37.26B | 1,920 | 0001104659-26-015563 |
CHICAGO, IL 60606-5312