13F GuideFiling Basics
What is SEC Form 13F? Ultimate Guide to Institutional Equity Filings
Learn how SEC Form 13F filings work, the $100M threshold, 45-day reporting lag, and how to track top hedge fund holdings.
AlphaSMO Research GuideRead Guide
CIK: 0001644956
Total reported value
$33.3B
$33.3B
423 檔
19.3%
As reported in its official Q1 2025 Form 13F filing, William Blair Investment Management, LLC's tracked investment portfolio stood at $33.3B with 423 total positions.
In Q1 2025, William Blair Investment Management, LLC displayed an active expansion posture, initiating 200 new positions and adding to 0 existing holdings, outstripping position reductions.
Showing top 200 holdings (of 423 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | MSFT | Microsoft CORP | Stock-Tech | 4.35% | -1.24% | -6.86% | |
| 2 | NVDA | Nvidia CORP | Stock-Tech | 3.71% | +0.02% | -8.15% | |
| 3 | TSM | Taiwan Semiconductor-sp Adr | Stock-Tech | 3.43% | +0.93% | -4.67% | |
| 4 | AMZN | Amazon.com Inc | Stock-Consumer Disc | 3.27% | -0.76% | -10.48% | |
| 5 | AAPL | Apple Inc | Stock-Tech | 3.27% | -1.20% | +2.64% | |
| 6 | META | Meta Platforms Inc-class A | Stock-Comm Services | 2.54% | -0.31% | -5.50% | |
| 7 | MA | Mastercard Inc - A | Stock-Financials | 1.87% | -0.33% | -15.39% | |
| 8 | CG | Carlyle Group Inc/the | Stock-Financials | 1.49% | -0.26% | -8.14% | |
| 9 | AVGO | Broadcom Inc | Stock-Tech | 1.45% | +0.09% | +375.41% | |
| 10 | MELI | Mercadolibre Inc | Stock-Consumer Disc | 1.40% | -0.43% | -1.13% | |
| 11 | SE | Sea Ltd-adr | Stock-Comm Services | 1.35% | — | +64.70% | |
| 12 | PRMB | Primo Brands CORP | Stock-Consumer Staples | 1.14% | +0.03% | +2.15% | |
| 13 | CPRT | Copart Inc | Stock-Industrials | 1.08% | -0.21% | +1.98% | |
| 14 | ORLY | O'reilly Automotive Inc | Stock-Consumer Disc | 1.04% | -0.16% | +10.02% | |
| 15 | INTU | Intuit Inc | Stock-Tech | 0.99% | -0.66% | -1.36% | |
| 16 | CMG | Chipotle Mexican Grill Inc | Stock-Consumer Disc | 0.96% | -0.08% | +9.26% | |
| 17 | COST | Costco Wholesale CORP | Stock-Consumer Staples | 0.94% | -0.44% | +4.86% | |
| 18 | UNH | Unitedhealth Group Inc | Stock-Healthcare | 0.92% | +0.05% | -5.70% | |
| 19 | LIN | Linde plc | Stock-Materials | 0.90% | -0.25% | -29.90% | |
| 20 | LRN | Stride Inc | Stock-Consumer Staples | 0.82% | +0.21% | NEW | |
| 21 | NOW | Servicenow Inc | Stock-Tech | 0.82% | -0.36% | -9.23% | |
| 22 | CRM | Salesforce Inc | Stock-Tech | 0.82% | -0.01% | -8.00% | |
| 23 | YUMC | Yum China Holdings Inc | Stock-Consumer Disc | 0.79% | — | +7.10% | |
| 24 | BFAM | Bright Horizons Family Solut | Stock-Consumer Disc | 0.79% | -0.10% | -6.72% | |
| 25 | TRU | Transunion | Stock-Financials | 0.78% | -0.09% | -0.78% | |
| 26 | CHE | Chemed CORP | Stock-Healthcare | 0.76% | — | EXIT | |
| 27 | IDXX | Idexx Laboratories Inc | Stock-Healthcare | 0.75% | -0.18% | +50.93% | |
| 28 | DOCS | Doximity Inc-class A | Stock-Healthcare | 0.75% | -0.37% | EXIT | |
| 29 | RACE | Ferrari N.V. | Stock-Consumer Disc | 0.72% | -0.03% | +1.43% | |
| 30 | EG | Everest Group, Ltd. | Stock-Financials | 0.72% | -0.03% | +9.26% | |
| 31 | BWIN | Baldwin Insurance Group Inc/ | Stock-Other | 0.70% | +0.05% | +13.34% | |
| 32 | CWST | Casella Waste Systems Inc-a | Stock-Industrials | 0.69% | -0.25% | -16.07% | |
| 33 | LRCX | Lam Research CORP | Stock-Tech | 0.68% | +0.07% | -2.53% | |
| 34 | DT | Dynatrace Inc | Stock-Tech | 0.67% | +0.12% | +4.10% | |
| 35 | CWAN | Clearwater Analytics Holdings, Inc. | Stock-Tech | 0.67% | — | -6.07% | |
| 36 | SPOT | Spotify Technology S.A. | Stock-Comm Services | 0.66% | -0.17% | EXIT | |
| 37 | MRCY | Mercury Systems Inc | Stock-Industrials | 0.65% | +0.06% | -16.48% | |
| 38 | LYV | Live Nation Entertainment In | Stock-Comm Services | 0.65% | — | -2.18% | |
| 39 | TLN | Talen Energy CORP | Stock-Utilities | 0.62% | +0.02% | -6.56% | |
| 40 | 8QR | Confluent Inc-class A | Stock-Other | 0.61% | — | -14.05% | |
| 41 | A | Agilent Technologies Inc | Stock-Healthcare | 0.61% | -0.17% | +11.45% | |
| 42 | UBER | Uber Technologies Inc | Stock-Industrials | 0.60% | — | -21.70% | |
| 43 | MANH | Manhattan Associates Inc | Stock-Tech | 0.58% | — | +75.95% | |
| 44 | PANW | Palo Alto Networks Inc | Stock-Tech | 0.57% | +0.04% | -5.85% | |
| 45 | SN | SharkNinja, Inc. | Stock-Consumer Disc | 0.54% | +0.07% | -18.74% | |
| 46 | BCO | Brink's Co/the | Stock-Industrials | 0.54% | -0.01% | -4.48% | |
| 47 | RY | Royal Bank Of Canada | Stock-Financials | 0.53% | — | EXIT | |
| 48 | EXLS | Exlservice Holdings Inc | Stock-Tech | 0.52% | — | -23.72% | |
| 49 | BAM | Brookfield Asset Mgmt-a | Stock-Financials | 0.51% | — | -0.33% | |
| 50 | FLUT | Flutter Entertainment plc | Stock-Consumer Disc | 0.50% | — | +51.89% |
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | MSFT | Microsoft CORP | — | NEW | New buy |
| 2 | NVDA | Nvidia CORP | — | NEW | New buy |
| 3 | TSM | Taiwan Semiconductor-sp Adr | — | NEW | New buy |
| 4 | AMZN | Amazon.com Inc | — | NEW | New buy |
| 5 | AAPL | Apple Inc | — | NEW | New buy |
| 6 | META | Meta Platforms Inc-class A | — | NEW | New buy |
| 7 | MA | Mastercard Inc - A | — | NEW | New buy |
| 8 | CG | Carlyle Group Inc/the | — | NEW | New buy |
| 9 | AVGO | Broadcom Inc | — | NEW | New buy |
| 10 | MELI | Mercadolibre Inc | — | NEW | New buy |
| 11 | SE | Sea Ltd-adr | — | NEW | New buy |
| 12 | PRMB | Primo Brands CORP | — | NEW | New buy |
| 13 | CPRT | Copart Inc | — | NEW | New buy |
| 14 | ORLY | O'reilly Automotive Inc | — | NEW | New buy |
| 15 | INTU | Intuit Inc | — | NEW | New buy |
| 16 | CMG | Chipotle Mexican Grill Inc | — | NEW | New buy |
| 17 | COST | Costco Wholesale CORP | — | NEW | New buy |
| 18 | UNH | Unitedhealth Group Inc | — | NEW | New buy |
| 19 | LIN | Linde plc | — | NEW | New buy |
| 20 | LRN | Stride Inc | — | NEW | New buy |
| 21 | NOW | Servicenow Inc | — | NEW | New buy |
| 22 | CRM | Salesforce Inc | — | NEW | New buy |
| 23 | YUMC | Yum China Holdings Inc | — | NEW | New buy |
| 24 | BFAM | Bright Horizons Family Solut | — | NEW | New buy |
| 25 | TRU | Transunion | — | NEW | New buy |
| 26 | CHE | Chemed CORP | — | NEW | New buy |
| 27 | IDXX | Idexx Laboratories Inc | — | NEW | New buy |
| 28 | DOCS | Doximity Inc-class A | — | NEW | New buy |
| 29 | RACE | Ferrari N.V. | — | NEW | New buy |
| 30 | EG | Everest Group, Ltd. | — | NEW | New buy |
| 31 | BWIN | Baldwin Insurance Group Inc/ | — | NEW | New buy |
| 32 | CWST | Casella Waste Systems Inc-a | — | NEW | New buy |
| 33 | LRCX | Lam Research CORP | — | NEW | New buy |
| 34 | DT | Dynatrace Inc | — | NEW | New buy |
| 35 | CWAN | Clearwater Analytics Holdings, Inc. | — | NEW | New buy |
| 36 | SPOT | Spotify Technology S.A. | — | NEW | New buy |
| 37 | MRCY | Mercury Systems Inc | — | NEW | New buy |
| 38 | LYV | Live Nation Entertainment In | — | NEW | New buy |
| 39 | TLN | Talen Energy CORP | — | NEW | New buy |
| 40 | 8QR | Confluent Inc-class A | — | NEW | New buy |
| 41 | A | Agilent Technologies Inc | — | NEW | New buy |
| 42 | UBER | Uber Technologies Inc | — | NEW | New buy |
| 43 | MANH | Manhattan Associates Inc | — | NEW | New buy |
| 44 | PANW | Palo Alto Networks Inc | — | NEW | New buy |
| 45 | SN | SharkNinja, Inc. | — | NEW | New buy |
| 46 | BCO | Brink's Co/the | — | NEW | New buy |
| 47 | RY | Royal Bank Of Canada | — | NEW | New buy |
| 48 | EXLS | Exlservice Holdings Inc | — | NEW | New buy |
| 49 | BAM | Brookfield Asset Mgmt-a | — | NEW | New buy |
| 50 | FLUT | Flutter Entertainment plc | — | NEW | New buy |
According to official SEC Form 13F filings, William Blair Investment Management, LLC reported a total U.S. public equity portfolio value of $33.3B across 423 disclosed positions in Q1 2025.
Expert Analysis & Guides for Tracking Wall Street Smart Money Movements
Learn how SEC Form 13F filings work, the $100M threshold, 45-day reporting lag, and how to track top hedge fund holdings.
In terms of portfolio concentration, the top 5 core holdings (including MSFT, NVDA, TSM) accounted for 19.3% of total reported equity market value during Q1 2025.
Top New Position Initiated
MSFT
市值: $1.5B
During Q1 2025, William Blair Investment Management, LLC's top holdings by market value included MSFT (4.3%)、NVDA (3.7%)、TSM (3.4%). The largest single position, MSFT, represented 4.3% of total portfolio value.
In Q1 2025, William Blair Investment Management, LLC made 200 total portfolio adjustments, initiating 200 new buys, adding to 0 positions, trimming 0 holdings, and fully liquidating 0 stocks.
All holding records on this page are fetched directly from the U.S. Securities and Exchange Commission (SEC) EDGAR system (Form 13F-HR). AlphaSMO parses CUSIP identifiers and formats data into Schema.org-compliant datasets.
Understand SEC Form 4 insider disclosures for corporate officers, directors, and 10% owners to track executive transactions.
Understand Rule 144 restricted stock sale notices to spot planned insider liquidations before market sell pressure arrives.
Explore the 5% beneficial ownership threshold, 13D vs 13G filing differences, and recent SEC accelerated deadline rules.
Best practices for analyzing 13F quarterly changes without getting misled by stock splits, options, or market valuation drift.
Learn how AlphaSMO's flagship signal detects high-conviction stocks where 13F hedge funds and corporate insiders buy at the same time.