# EDGAR Filing Document

**Accession Number:** 0000822632
**File Stem:** 0001410368-26-013322
**Filing Date:** 2026-2
**Character Count:** 14396
**Document Hash:** c00eae70002485bb466c51f06293dc10
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-013322.hdr.sgml**: 20260218

**ACCESSION NUMBER**: 0001410368-26-013322

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260218

**DATE AS OF CHANGE**: 20260218

**PERIOD START**: 20251231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WILLIAM BLAIR FUNDS
- **CENTRAL INDEX KEY:** 0000822632

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-05344
- **FILM NUMBER:** 26646322

**BUSINESS ADDRESS:**
- **STREET 1:** 150 NORTH RIVERSIDE PLAZA
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3123648000

**MAIL ADDRESS:**
- **STREET 1:** 150 NORTH RIVERSIDE PLAZA
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WILLIAM BLAIR MUTUAL FUNDS INC
- **DATE OF NAME CHANGE:** 19960112

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BLAIR WILLIAM READY RESERVES INC
- **DATE OF NAME CHANGE:** 19920316

## Series and Classes Contracts Data

### William Blair Large Cap Growth Fund (Series ID: S000008601)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000023538 | Class N      | LCGNX           |
| C000023539 | Class I      | LCGFX           |
| C000211719 | Class R6     | LCGJX           |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** WILLIAM BLAIR FUNDS

- **b. Investment Company Act file number:** 811-05344

- **c. CIK number of Registrant:** 0000822632

- **d. LEI of Registrant:** SNQR0U5FDV8EZZX4W051

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 150 NORTH RIVERSIDE PLAZA

  - **City:** CHICAGO

  - **State:** IL

  - **Foreign country:** US

  - **Zip / Postal Code:** 60606

  - **Telephone number:** 312-364-8000

**Item A.2. Information about the Series.**

- **a. Name of Series:** William Blair Large Cap Growth Fund

- **b. EDGAR series identifier (if any):** S000008601

- **c. LEI of Series:** 549300RO7YVMUSCG4F70

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-12-31

- **b. Date as of which information is reported:** 2025-12-31

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $2631747972.32

**Total Liabilities:** $1889478.08

**Net Assets:** $2629858494.24

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000023538 | 2.53%                | -2.50%               | -1.90%               |
| Class ID C000023539 | 2.52%                | -2.45%               | -1.87%               |
| Class ID C000211719 | 2.55%                | -2.48%               | -1.84%               |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $16269719.26             | $55719987.92                               |
| Month 2  | $26656611.35             | $-96800184.44                              |
| Month 3  | $31474765.91             | $-82793977.75                              |

### Schedule of Portfolio Investments

| Name                            | Title                           | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| Advanced Micro Devices Inc      | Advanced Micro Devices Inc      | CUSIP: 007903107<br>LEI: R2I72C950HOYXII45366 | Long             | EC               | CORP              | US        |    222930 | NS      | $47742688.80  | 1.82%             |  |  |  | No            |                  1 | On Loan: No      |
| Agilent Technologies Inc        | Agilent Technologies Inc        | CUSIP: 00846U101<br>LEI: QUIX8Y7A2WP0XRMW7G29 | Long             | EC               | CORP              | US        |    377840 | NS      | $51412688.80  | 1.95%             |  |  |  | No            |                  1 | On Loan: No      |
| Alphabet Inc                    | Alphabet Inc                    | CUSIP: 02079K305<br>LEI: 5493006MHB84DD0ZWV18 | Long             | EC               | CORP              | US        |    546870 | NS      | $171170310.00 | 6.51%             |  |  |  | No            |                  1 | On Loan: No      |
| Amazon.com Inc                  | Amazon.com Inc                  | CUSIP: 023135106<br>LEI: ZXTILKJKG63JELOEG630 | Long             | EC               | CORP              | US        |    784190 | NS      | $181006735.80 | 6.88%             |  |  |  | No            |                  1 | On Loan: No      |
| Apple Inc                       | Apple Inc                       | CUSIP: 037833100<br>LEI: HWUPKR0MPOU8FGXBT394 | Long             | EC               | CORP              | US        |    991880 | NS      | $269652496.80 | 10.25%            |  |  |  | No            |                  1 | On Loan: No      |
| Blue Owl Capital Inc            | Blue Owl Capital Inc            | CUSIP: 09581B103<br>LEI: N/A                  | Long             | EC               | CORP              | US        |   1384960 | NS      | $20691302.40  | 0.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Broadcom Inc                    | Broadcom Inc                    | CUSIP: 11135F101<br>LEI: 549300WV6GIDOZJTV909 | Long             | EC               | CORP              | US        |    359710 | NS      | $124495631.00 | 4.73%             |  |  |  | No            |                  1 | On Loan: No      |
| CH Robinson Worldwide Inc       | CH Robinson Worldwide Inc       | CUSIP: 12541W209<br>LEI: 529900WNWN5L0OVDHA79 | Long             | EC               | CORP              | US        |     78730 | NS      | $12656634.80  | 0.48%             |  |  |  | No            |                  1 | On Loan: No      |
| Carlyle Group Inc/The           | Carlyle Group Inc/The           | CUSIP: 14316J108<br>LEI: 529900NGGVF94UK6PG95 | Long             | EC               | CORP              | US        |    741297 | NS      | $43818065.67  | 1.67%             |  |  |  | No            |                  1 | On Loan: No      |
| Cava Group Inc                  | Cava Group Inc                  | CUSIP: 148929102<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    262100 | NS      | $15382649.00  | 0.58%             |  |  |  | No            |                  1 | On Loan: No      |
| Chipotle Mexican Grill Inc      | Chipotle Mexican Grill Inc      | CUSIP: 169656105<br>LEI: 529900REP5VGTPCP1J71 | Long             | EC               | CORP              | US        |    570010 | NS      | $21090370.00  | 0.80%             |  |  |  | No            |                  1 | On Loan: No      |
| Copart Inc                      | Copart Inc                      | CUSIP: 217204106<br>LEI: 549300KVYX3JWMYEHU61 | Long             | EC               | CORP              | US        |    817490 | NS      | $32004733.50  | 1.22%             |  |  |  | No            |                  1 | On Loan: No      |
| Costco Wholesale Corp           | Costco Wholesale Corp           | CUSIP: 22160K105<br>LEI: 29DX7H14B9S6O3FD6V18 | Long             | EC               | CORP              | US        |     61230 | NS      | $52801078.20  | 2.01%             |  |  |  | No            |                  1 | On Loan: No      |
| Meta Platforms Inc              | Meta Platforms Inc              | CUSIP: 30303M102<br>LEI: BQ4BKCS1HXDV9HN80Z93 | Long             | EC               | CORP              | US        |    189130 | NS      | $124842821.70 | 4.75%             |  |  |  | No            |                  1 | On Loan: No      |
| IDEXX Laboratories Inc          | IDEXX Laboratories Inc          | CUSIP: 45168D104<br>LEI: OGMTXK0LUU1HKV2P0J84 | Long             | EC               | CORP              | US        |     80420 | NS      | $54406542.60  | 2.07%             |  |  |  | No            |                  1 | On Loan: No      |
| Intuit Inc                      | Intuit Inc                      | CUSIP: 461202103<br>LEI: VI90HBPH7XSFMB9E4M29 | Long             | EC               | CORP              | US        |     73090 | NS      | $48416277.80  | 1.84%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Russell 1000 Growth ETF | iShares Russell 1000 Growth ETF | CUSIP: 464287614<br>LEI: 549300H1KWQVEKI25E14 | Long             | EC               | RF                | US        |    111040 | NS      | $52555232.00  | 2.00%             |  |  |  | No            |                  1 | On Loan: No      |
| Martin Marietta Materials Inc   | Martin Marietta Materials Inc   | CUSIP: 573284106<br>LEI: 5299005MZ4WZECVATV08 | Long             | EC               | CORP              | US        |     50510 | NS      | $31450556.60  | 1.20%             |  |  |  | No            |                  1 | On Loan: No      |
| Mastercard Inc                  | Mastercard Inc                  | CUSIP: 57636Q104<br>LEI: AR5L2ODV9HN37376R084 | Long             | EC               | CORP              | US        |    188220 | NS      | $107451033.60 | 4.09%             |  |  |  | No            |                  1 | On Loan: No      |
| Microsoft Corp                  | Microsoft Corp                  | CUSIP: 594918104<br>LEI: INR2EJN1ERAN0W5ZP974 | Long             | EC               | CORP              | US        |    640560 | NS      | $309787627.20 | 11.78%            |  |  |  | No            |                  1 | On Loan: No      |
| Monster Beverage Corp           | Monster Beverage Corp           | CUSIP: 61174X109<br>LEI: 52990090AP0E7HCB6F33 | Long             | EC               | CORP              | US        |    701790 | NS      | $53806239.30  | 2.05%             |  |  |  | No            |                  1 | On Loan: No      |
| NVIDIA Corp                     | NVIDIA Corp                     | CUSIP: 67066G104<br>LEI: 549300S4KLFTLO7GSQ80 | Long             | EC               | CORP              | US        |   1948760 | NS      | $363443740.00 | 13.82%            |  |  |  | No            |                  1 | On Loan: No      |
| O'Reilly Automotive Inc         | O'Reilly Automotive Inc         | CUSIP: 67103H107<br>LEI: 549300K2RLMQL149Q332 | Long             | EC               | CORP              | US        |    555060 | NS      | $50627022.60  | 1.93%             |  |  |  | No            |                  1 | On Loan: No      |
| Oracle Corp                     | Oracle Corp                     | CUSIP: 68389X105<br>LEI: 1Z4GXXU7ZHVWFCD8TV52 | Long             | EC               | CORP              | US        |    219540 | NS      | $42790541.40  | 1.63%             |  |  |  | No            |                  1 | On Loan: No      |
| ServiceNow Inc                  | ServiceNow Inc                  | CUSIP: 81762P102<br>LEI: 549300HJTQM36M0E1G39 | Long             | EC               | CORP              | US        |    364020 | NS      | $55764223.80  | 2.12%             |  |  |  | No            |                  1 | On Loan: No      |
| Snowflake Inc                   | Snowflake Inc                   | CUSIP: 833445109<br>LEI: 254900CJNSY1K7T53Z16 | Long             | EC               | CORP              | US        |    234490 | NS      | $51437726.40  | 1.96%             |  |  |  | No            |                  1 | On Loan: No      |
| Fixed Income Clearing Corp      | FIXED INC CLEARING CORP.REPO    | CUSIP: 000000000<br>LEI: 549300H47WTHXPU08X20 | Long             | RA               | CORP              | US        |  19138506 | PA      | $19138505.66  | 0.73%             |  |  |  | No            |                  2 | On Loan: No      |
| TransUnion                      | TransUnion                      | CUSIP: 89400J107<br>LEI: 549300ZS772LUNUMRB03 | Long             | EC               | CORP              | US        |    488740 | NS      | $41909455.00  | 1.59%             |  |  |  | No            |                  1 | On Loan: No      |
| Tyler Technologies Inc          | Tyler Technologies Inc          | CUSIP: 902252105<br>LEI: 25490040SMU4Z8LBCW70 | Long             | EC               | CORP              | US        |     87479 | NS      | $39711092.05  | 1.51%             |  |  |  | No            |                  1 | On Loan: No      |
| UnitedHealth Group Inc          | UnitedHealth Group Inc          | CUSIP: 91324P102<br>LEI: 549300GHBMY8T5GXDE41 | Long             | EC               | CORP              | US        |    142225 | NS      | $46949894.75  | 1.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Veeva Systems Inc               | Veeva Systems Inc               | CUSIP: 922475108<br>LEI: 549300YZEXPDB92M2F02 | Long             | EC               | CORP              | US        |    162770 | NS      | $36335147.10  | 1.38%             |  |  |  | No            |                  1 | On Loan: No      |
| Verisk Analytics Inc            | Verisk Analytics Inc            | CUSIP: 92345Y106<br>LEI: 549300I1YSWNIRKBWP67 | Long             | EC               | CORP              | US        |     71960 | NS      | $16096732.40  | 0.61%             |  |  |  | No            |                  1 | On Loan: No      |
| Linde PLC                       | Linde PLC                       | CUSIP: 000000000<br>LEI: 5299003QR1WT0EF88V51 | Long             | EC               | CORP              | IE        |     93690 | NS      | $39948479.10  | 1.52%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2026-01-15

**Name of Applicant:** WILLIAM BLAIR FUNDS

**Signature:** John Raczek

**Name of Signer:** John Raczek

**Title:** Principal Financial Officer