CIK: 0000902367
Total reported value
$34.9B
Reporting period: 2026-03-31 · Number of holdings: 1922
BLAIR WILLIAM & CO/IL disclosed 1922 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $34.9B and a quarterly turnover rate of 23.0%.
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Blair William & Co/il's disclosed holdings carry a Herfindahl concentration index of 0.011 — mathematically equivalent to about 93 equally-sized positions, well below its 1922 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 4.44), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Trim MSFT
-2.1% -$433.8M
Add RSP
+205.6% $217.2M
Add GEV
+1.9% $153.8M
Trim WDAY
-69.3% -$145.0M
Trim NOW
-18.7% -$151.0M
Trim APP
-52.5% -$142.7M
The fund rotates capital out of megacap tech and SaaS into broad-market indexers and industrial plays, trimming MSFT, AMZN, NOW, IDXX, WDAY, and APP while adding RSP and GEV. It locks gains on crowded tech trades via a hyper-diversified 1922-name portfolio, preserving macro exposure through active sector weight shifts.
Betting on capital allocation decoupling as funds shift from AI hyperscalers to real-economy industrials and utilities; the opposing thesis holds that tech's moats remain impenetrable and higher discount rates fail to crush secular growth narratives.
A 1922-holding count (HHI 0.01) dilutes active management edge into passive beta; trimming mega-caps creates an immediate positioning squeeze vulnerability if AI Capex cycles reignite without demand follow-through.
Generated by AI based on public SEC filings. Reflects past holdings only and should not be treated as investment advice.
Showing top 200 holdings (of 1922 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | AAPL | Apple INC | Stock-Tech | 4.31% | -0.03% | -0.32% | |
| 2 | MSFT | Microsoft CORP | Stock-Tech | 3.71% | -0.93% | -2.14% | |
| 3 | AMZN | Amazon.com INC | Stock-Consumer Disc | 3.62% | -0.14% | -0.11% | |
| 4 | NVDA | Nvidia CORP | Stock-Tech | 2.71% | -0.04% | -1.21% | |
| 5 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 2.50% | -0.13% | -2.66% | |
| 6 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 2.01% | -0.08% | -2.30% | |
| 7 | JPM | Jpmorgan Chase & Co | Stock-Financials | 1.94% | -0.06% | -0.11% | |
| 8 | GEV | GE Vernova INC | Stock-Industrials | 1.66% | +0.52% | +1.89% | |
| 9 | V | Visa Inc-class A Shares | Stock-Financials | 1.60% | -0.22% | -4.39% | |
| 10 | SPY | Ss Spdr S&p 500 ETF Trust-us | ETF-Large Cap & Growth | 1.58% | — | -1.46% | |
| 11 | IDXX | Idexx Laboratories INC | Stock-Healthcare | 1.52% | -0.30% | -5.50% | |
| 12 | COST | Costco Wholesale CORP | Stock-Consumer Staples | 1.49% | +0.28% | +0.02% | |
| 13 | MA | Mastercard INC - A | Stock-Financials | 1.32% | -0.14% | -3.33% | |
| 14 | META | Meta Platforms Inc-class A | Stock-Comm Services | 1.18% | -0.12% | -1.97% | |
| 15 | FAST | Fastenal Co | Stock-Industrials | 0.98% | +0.22% | +5.12% | |
| 16 | RSP | Invesco S&p 500 Equal Weight | ETF-Large Cap & Growth | 0.92% | +0.64% | +205.57% | |
| 17 | APH | Amphenol Corp-cl A | Stock-Tech | 0.91% | — | -5.03% | |
| 18 | IVV | Ishares Core S&p 500 ETF | ETF-Large Cap & Growth | 0.91% | — | -0.53% | |
| 19 | VEU | Vanguard Ftse All-world Ex-u | ETF-Other | 0.90% | +0.36% | +53.74% | |
| 20 | LLY | Eli Lilly & Co | Stock-Healthcare | 0.85% | -0.09% | -0.24% | |
| 21 | WMT | Walmart INC | Stock-Consumer Staples | 0.85% | — | -1.59% | |
| 22 | BWXT | Bwx Technologies INC | Stock-Industrials | 0.84% | +0.17% | -0.11% | |
| 23 | ABBV | Abbvie INC | Stock-Healthcare | 0.83% | — | -0.25% | |
| 24 | AVGO | Broadcom INC | Stock-Tech | 0.81% | — | +2.44% | |
| 25 | SYK | Stryker CORP | Stock-Healthcare | 0.80% | — | +0.33% | |
| 26 | ICE | Intercontinental Exchange In | Stock-Financials | 0.72% | — | -5.73% | |
| 27 | HD | Home Depot INC | Stock-Consumer Disc | 0.72% | — | +0.69% | |
| 28 | VEA | Vanguard Ftse Developed ETF | ETF-Other | 0.71% | +0.18% | +22.66% | |
| 29 | DHR | Danaher CORP | Stock-Healthcare | 0.70% | -0.14% | -5.52% | |
| 30 | PGR | Progressive CORP | Stock-Financials | 0.69% | -0.17% | -13.31% | |
| 31 | VOO | Vanguard S&p 500 ETF | ETF-Large Cap & Growth | 0.68% | — | +5.90% | |
| 32 | BRK-B | Berkshire Hathaway Inc-cl B | Stock-Other | 0.68% | — | +10.79% | |
| 33 | UBER | Uber Technologies INC | Stock-Industrials | 0.68% | -0.22% | -19.67% | |
| 34 | JNJ | Johnson & Johnson | Stock-Healthcare | 0.67% | — | +0.64% | |
| 35 | ECL | Ecolab INC | Stock-Materials | 0.66% | — | +1.00% | |
| 36 | VTV | Vanguard Value ETF | ETF-Other | 0.66% | +0.20% | +29.83% | |
| 37 | WSO | Watsco INC | Stock-Industrials | 0.61% | — | -13.73% | |
| 38 | AXP | American Express Co | Stock-Financials | 0.60% | -0.10% | -0.90% | |
| 39 | PANW | Palo Alto Networks INC | Stock-Tech | 0.60% | — | +4.36% | |
| 40 | ISRG | Intuitive Surgical INC | Stock-Healthcare | 0.56% | -0.11% | -3.22% | |
| 41 | TDG | Transdigm Group INC | Stock-Industrials | 0.55% | — | -2.34% | |
| 42 | NOW | Servicenow INC | Stock-Tech | 0.54% | -0.37% | -18.69% | |
| 43 | VEEV | Veeva Systems Inc-class A | Stock-Healthcare | 0.54% | -0.20% | -13.10% | |
| 44 | BA | Boeing Co/the | Stock-Industrials | 0.53% | — | +35.89% | |
| 45 | QQQ | Invesco Qqq Trust Series 1 | ETF-Tech | 0.51% | — | +10.56% | |
| 46 | P | Everpure Inc-a | Stock-Tech | 0.49% | — | -4.44% | |
| 47 | NFLX | Netflix INC | Stock-Comm Services | 0.49% | — | +17.90% | |
| 48 | GLD | Spdr Gold Shares | ETF-Commodities | 0.48% | +0.21% | +51.54% | |
| 49 | CTAS | Cintas CORP | Stock-Industrials | 0.47% | — | -2.16% | |
| 50 | XOM | Exxon Mobil CORP | Stock-Energy | 0.46% | +0.15% | -2.25% |
Performance for Q3 2026
+2.5%
Performance Last 4 Quarters
+10%
Based on 78% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 1922 | $34.9B | 23 | |
| 2025-12-31 | 1920 | $37.3B | 14 | |
| 2025-09-30 | 1844 | $37.6B | 27 | |
| 2025-06-30 | 1824 | $36.0B | 0 | |
| 2025-03-31 | 1801 | $33.2B | 100 | |
| 2024-12-31 | 1816 | $34.4B | 0 | |
| 2024-09-30 | 1821 | $34.1B | 0 | |
| 2024-06-30 | 1822 | $32.4B | 0 | |
| 2024-03-31 | 1787 | $31.8B | 0 | |
| 2023-12-31 | 1785 | $29.3B | 0 | |
| 2023-09-30 | 1791 | $26.1B | 0 | |
| 2023-06-30 | 1809 | $27.3B | 0 | |
| 2023-03-31 | 1801 | $25.0B | 0 | |
| 2022-12-31 | 1814 | $23.0B | 0 | |
| 2022-09-30 | 1823 | $21.8B | 0 | |
| 2022-06-30 | 1863 | $22.5B | 0 | |
| 2022-03-31 | 1910 | $28.5B | 0 | |
| 2021-12-31 | 1963 | $31.9B | 0 | |
| 2021-09-30 | 1879 | $29.4B | 0 | |
| 2021-06-30 | 1888 | $28.9B | 100 | |
| 2021-03-31 | 1856 | $26.5B | 17 | |
| 2020-12-31 | 1828 | $27.3B | 18 | |
| 2020-09-30 | 1720 | $23.6B | 18 | |
| 2020-06-30 | 1681 | $21.0B | 31 | |
| 2020-03-31 | 1660 | $16.0B | 27 | |
| 2019-12-31 | 1728 | $19.5B | 16 | |
| 2019-09-30 | 1697 | $17.4B | 13 | |
| 2019-06-30 | 1734 | $17.5B | 16 | |
| 2019-03-31 | 1705 | $16.4B | 23 | |
| 2018-12-31 | 1654 | $13.7B | 26 | |
| 2018-09-30 | 1619 | $16.3B | 16 | |
| 2018-06-30 | 1586 | $14.7B | 14 | |
| 2018-03-31 | 1506 | $14.1B | 17 | |
| 2017-12-31 | 1362 | $14.7B | 18 | |
| 2017-09-30 | 1357 | $13.3B | 18 | |
| 2017-06-30 | 1644 | $13.3B | 18 | |
| 2017-03-31 | 1477 | $12.4B | 19 | |
| 2016-12-31 | 1415 | $11.2B | 19 | |
| 2016-09-30 | 1296 | $11.3B | 17 | |
| 2016-06-30 | 1242 | $10.7B | 18 | |
| 2016-03-31 | 1218 | $10.6B | 18 | |
| 2015-12-31 | 1251 | $10.7B | 31 | |
| 2015-09-30 | 1426 | $11.6B | 100 | |
| 2015-06-30 | 2214 | $66.9B | 30 | |
| 2015-03-31 | 2165 | $65.0B | 33 | |
| 2014-12-31 | 2131 | $61.9B | 34 | |
| 2014-09-30 | 2129 | $58.5B | 34 | |
| 2014-06-30 | 2100 | $61.2B | 39 | |
| 2014-03-31 | 2050 | $60.4B | 40 | |
| 2013-12-31 | 2015 | $60.5B | 37 | |
| 2013-09-30 | 2048 | $56.2B | 35 | |
| 2013-06-30 | 1991 | $50.6B | — |
Blair William & Co/il's most significant position changes for 2026-03-31: Trim: Microsoft CORP (MSFT) — shares -2.14%; Add: Invesco S&p 500 Equal Weight (RSP) — shares +205.57%; Add: GE Vernova INC (GEV) — shares +1.89%; Trim: Workday Inc-class A (WDAY) — shares -69.31%; Trim: Servicenow INC (NOW) — shares -18.69%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | RSP | Invesco S&p 500 Equal Weight | +0.6% | +205.57% | Add |
| 2 | GEV | GE Vernova INC | +0.5% | +1.89% | Add |
| 3 | VEU | Vanguard Ftse All-world Ex-u | +0.4% | +53.74% | Add |
| 4 | COST | Costco Wholesale CORP | +0.3% | +0.02% | Add |
| 5 | PWR | Quanta Services INC | +0.3% | +181.25% | Add |
| 6 | FAST | Fastenal Co | +0.2% | +5.12% | Add |
| 7 | GLD | Spdr Gold Shares | +0.2% | +51.54% | Add |
| 8 | VTV | Vanguard Value ETF | +0.2% | +29.83% | Add |
| 9 | VEA | Vanguard Ftse Developed ETF | +0.2% | +22.66% | Add |
| 10 | BWXT | Bwx Technologies INC | +0.2% | -0.11% | Trim |
| 11 | CVX | Chevron CORP | +0.2% | +7.43% | Add |
| 12 | XOM | Exxon Mobil CORP | +0.2% | -2.25% | Trim |
| 13 | MDLN | Medline Inc-cl A | +0.1% | +2325.45% | Add |
| 14 | MCK | Mckesson CORP | +0.1% | +177.23% | Add |
| 15 | AAPL | Apple INC | 0% | -0.32% | Trim |
| 16 | NVDA | Nvidia CORP | 0% | -1.21% | Trim |
| 17 | JPM | Jpmorgan Chase & Co | -0.1% | -0.11% | Trim |
| 18 | GOOGL | Alphabet Inc-cl A | -0.1% | -2.30% | Trim |
| 19 | LLY | Eli Lilly & Co | -0.1% | -0.24% | Trim |
| 20 | AXP | American Express Co | -0.1% | -0.90% | Trim |
| 21 | ACN | Accenture plc | -0.1% | -18.93% | Trim |
| 22 | ISRG | Intuitive Surgical INC | -0.1% | -3.22% | Trim |
| 23 | META | Meta Platforms Inc-class A | -0.1% | -1.97% | Trim |
| 24 | GOOG | Alphabet Inc-cl C | -0.1% | -2.66% | Trim |
| 25 | IRTC | Irhythm Holdings INC | -0.1% | -12.58% | Trim |
| 26 | SPGI | S&p Global INC | -0.1% | -32.23% | Trim |
| 27 | AMZN | Amazon.com INC | -0.1% | -0.11% | Trim |
| 28 | MA | Mastercard INC - A | -0.1% | -3.33% | Trim |
| 29 | DHR | Danaher CORP | -0.1% | -5.52% | Trim |
| 30 | ABT | Abbott Laboratories | -0.1% | -15.85% | Trim |
| 31 | MDB | Mongodb INC | -0.1% | -7.79% | Trim |
| 32 | PGR | Progressive CORP | -0.2% | -13.31% | Trim |
| 33 | BX | Blackstone INC | -0.2% | -13.91% | Trim |
| 34 | CRM | Salesforce INC | -0.2% | -29.54% | Trim |
| 35 | GWRE | Guidewire Software INC | -0.2% | -14.04% | Trim |
| 36 | RYAN | Ryan Specialty Holdings INC | -0.2% | -34.92% | Trim |
| 37 | VEEV | Veeva Systems Inc-class A | -0.2% | -13.10% | Trim |
| 38 | PCOR | Procore Technologies INC | -0.2% | -78.84% | Trim |
| 39 | ADBE | Adobe INC | -0.2% | -59.53% | Trim |
| 40 | CWAN | Clearwater Analytics Holdings, Inc. | -0.2% | -97.70% | Trim |
| 41 | V | Visa Inc-class A Shares | -0.2% | -4.39% | Trim |
| 42 | UBER | Uber Technologies INC | -0.2% | -19.67% | Trim |
| 43 | INTU | Intuit INC | -0.2% | -37.45% | Trim |
| 44 | CSGP | Costar Group INC | -0.3% | -55.51% | Trim |
| 45 | TYL | Tyler Technologies INC | -0.3% | -44.93% | Trim |
| 46 | IDXX | Idexx Laboratories INC | -0.3% | -5.50% | Trim |
| 47 | NOW | Servicenow INC | -0.4% | -18.69% | Trim |
| 48 | APP | Applovin Corp-class A | -0.4% | -52.47% | Trim |
| 49 | WDAY | Workday Inc-class A | -0.4% | -69.31% | Trim |
| 50 | MSFT | Microsoft CORP | -0.9% | -2.14% | Trim |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-08 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-17 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-12 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-07-24 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-09 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-12 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-12 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-12 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-09 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-12 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-09 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-11 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-12 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-10 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-09 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-10 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-13 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-12 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-12 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-13 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-09 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-06 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-12 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-11 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-13 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-12 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-13 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-14 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-14 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-13 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-13 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-15 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-14 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-13 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-04 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-10 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-14 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-08 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-16 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-16 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-12 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-03 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-11 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-05 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-11-04 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-01 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-06 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-02-11 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-11-12 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-07 | 13F-HR | View on EDGAR |
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