# EDGAR Filing Document

**Accession Number:** 0000822632
**File Stem:** 0001752724-23-029946
**Filing Date:** 2023-2
**Character Count:** 20291
**Document Hash:** 28c781b814b56f15a3f8c511189917e6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-23-029946.hdr.sgml**: 20230221

**ACCESSION NUMBER**: 0001752724-23-029946

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20221231

**FILED AS OF DATE**: 20230221

**DATE AS OF CHANGE**: 20230221

**PERIOD START**: 20221231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** WILLIAM BLAIR FUNDS
- **CENTRAL INDEX KEY:** 0000822632
- **IRS NUMBER:** 000000000
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-05344
- **FILM NUMBER:** 23645615

**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 Mid Cap Growth Fund (Series ID: S000010050)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000027836 | Class N      | WCGNX           |
| C000027837 | Class I      | WCGIX           |
| C000211724 | Class R6     | WCGJX           |

## 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 Mid Cap Growth Fund

- **b. EDGAR series identifier (if any):** S000010050

- **c. LEI of Series:** 549300N1VIU42BB76F73

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

- **a. Date of fiscal year-end:** 2022-12-31

- **b. Date as of which information is reported:** 2022-12-31

**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:** $32581438.88

**Total Liabilities:** $70212.36

**Net Assets:** $32511226.52

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000027836 | 7.18%                | 10.37%               | -4.87%               |
| Class ID C000027837 | 7.11%                | 10.35%               | -4.86%               |
| Class ID C000211724 | 7.21%                | 10.33%               | -4.85%               |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $186720.16               | $2010842.70                                |
| Month 2  | $-188667.71              | $3544618.19                                |
| Month 3  | $-206389.57              | $-1505060.40                               |

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| Charles River Laboratories International Inc | Charles River Laboratories International Inc | CUSIP: 159864107<br>LEI: 549300BSQ0R4UZ5KX287 | Long             | EC               | CORP              | US        |      2300 | NS      | $501170.00    | 1.54%             |  |  |  | No            |                  1 | On Loan: No      |
| Pure Storage Inc                             | Pure Storage Inc                             | CUSIP: 74624M102<br>LEI: 549300NPDB0BZTK3WO90 | Long             | EC               | CORP              | US        |     28910 | NS      | $773631.60    | 2.38%             |  |  |  | No            |                  1 | On Loan: No      |
| EPAM Systems Inc                             | EPAM Systems Inc                             | CUSIP: 29414B104<br>LEI: 549300XCR4R530HJP604 | Long             | EC               | CORP              | US        |      1175 | NS      | $385094.50    | 1.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Dynatrace Inc                                | Dynatrace Inc                                | CUSIP: 268150109<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     21010 | NS      | $804683.00    | 2.48%             |  |  |  | No            |                  1 | On Loan: No      |
| Teledyne Technologies Inc                    | Teledyne Technologies Inc                    | CUSIP: 879360105<br>LEI: 549300VSMO9KYQWDND94 | Long             | EC               | CORP              | US        |      2680 | NS      | $1071758.80   | 3.30%             |  |  |  | No            |                  1 | On Loan: No      |
| Chipotle Mexican Grill Inc                   | Chipotle Mexican Grill Inc                   | CUSIP: 169656105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |       667 | NS      | $925455.83    | 2.85%             |  |  |  | No            |                  1 | On Loan: No      |
| Pool Corp                                    | Pool Corp                                    | CUSIP: 73278L105<br>LEI: 5493005VZK1KMN6CO617 | Long             | EC               | CORP              | US        |      1800 | NS      | $544194.00    | 1.67%             |  |  |  | No            |                  1 | On Loan: No      |
| Hess Corp                                    | Hess Corp                                    | CUSIP: 42809H107<br>LEI: UASVRYNXNK17ULIGK870 | Long             | EC               | CORP              | US        |      6845 | NS      | $970757.90    | 2.99%             |  |  |  | No            |                  1 | On Loan: No      |
| Agilent Technologies Inc                     | Agilent Technologies Inc                     | CUSIP: 00846U101<br>LEI: QUIX8Y7A2WP0XRMW7G29 | Long             | EC               | CORP              | US        |      5970 | NS      | $893410.50    | 2.75%             |  |  |  | No            |                  1 | On Loan: No      |
| Burlington Stores Inc                        | Burlington Stores Inc                        | CUSIP: 122017106<br>LEI: 5299003Z37DVGKKC1W09 | Long             | EC               | CORP              | US        |      4130 | NS      | $837398.80    | 2.58%             |  |  |  | No            |                  1 | On Loan: No      |
| Fixed Income Clearing Corp                   | FIXED INC CLEARING CORP.REPO                 | CUSIP: 000000000<br>LEI: 549300H47WTHXPU08X20 | Long             | RA               | CORP              | US        |   1190831 | PA      | $1190830.67   | 3.66%             |  |  |  | No            |                  2 | On Loan: No      |
| Vulcan Materials Co                          | Vulcan Materials Co                          | CUSIP: 929160109<br>LEI: 549300Q8LSNHAVWBNI21 | Long             | EC               | CORP              | US        |      6675 | NS      | $1168859.25   | 3.60%             |  |  |  | No            |                  1 | On Loan: No      |
| Crown Holdings Inc                           | Crown Holdings Inc                           | CUSIP: 228368106<br>LEI: NYLWZIOY8PUNIT4JOE22 | Long             | EC               | CORP              | US        |      6230 | NS      | $512168.30    | 1.58%             |  |  |  | No            |                  1 | On Loan: No      |
| CONTRA ABIOMED INC                           | CONTRA ABIOMED INC                           | CUSIP: 003CVR016<br>LEI: N/A                  | Long             | EC               | CORP              | US        |      1508 | NS      | $0.00         | 0.00%             |  |  |  | No            |                  3 | On Loan: No      |
| Western Alliance Bancorp                     | Western Alliance Bancorp                     | CUSIP: 957638109<br>LEI: 5493003VJXZ5JXT9S762 | Long             | EC               | CORP              | US        |      8000 | NS      | $476480.00    | 1.47%             |  |  |  | No            |                  1 | On Loan: No      |
| Align Technology Inc                         | Align Technology Inc                         | CUSIP: 016255101<br>LEI: 549300N5YSE0U3LCP840 | Long             | EC               | CORP              | US        |      1995 | NS      | $420745.50    | 1.29%             |  |  |  | No            |                  1 | On Loan: No      |
| Veeva Systems Inc                            | Veeva Systems Inc                            | CUSIP: 922475108<br>LEI: 549300YZEXPDB92M2F02 | Long             | EC               | CORP              | US        |      6915 | NS      | $1115942.70   | 3.43%             |  |  |  | No            |                  1 | On Loan: No      |
| Axon Enterprise Inc                          | Axon Enterprise Inc                          | CUSIP: 05464C101<br>LEI: 549300QP2IEEGFE16681 | Long             | EC               | CORP              | US        |      6235 | NS      | $1034573.55   | 3.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Coupa Software Inc                           | Coupa Software Inc                           | CUSIP: 22266L106<br>LEI: 549300Q95ICR2GFL2K37 | Long             | EC               | CORP              | US        |      5183 | NS      | $410338.11    | 1.26%             |  |  |  | No            |                  1 | On Loan: No      |
| Take-Two Interactive Software Inc            | Take-Two Interactive Software Inc            | CUSIP: 874054109<br>LEI: BOMSTHHJK882EWYX3334 | Long             | EC               | CORP              | US        |      3295 | NS      | $343108.35    | 1.06%             |  |  |  | No            |                  1 | On Loan: No      |
| MongoDB Inc                                  | MongoDB Inc                                  | CUSIP: 60937P106<br>LEI: 549300TPTG69WKWE1Z37 | Long             | EC               | CORP              | US        |      2565 | NS      | $504894.60    | 1.55%             |  |  |  | No            |                  1 | On Loan: No      |
| Ares Management Corp                         | Ares Management Corp                         | CUSIP: 03990B101<br>LEI: 529900JUV61FH7B8VW38 | Long             | EC               | CORP              | US        |      5585 | NS      | $382237.40    | 1.18%             |  |  |  | No            |                  1 | On Loan: No      |
| Nice Ltd                                     | Nice Ltd                                     | CUSIP: 653656108<br>LEI: 254900YTY4EF5Z4W0A51 | Long             | EC               | CORP              | IL        |      3610 | NS      | $694203.00    | 2.14%             |  |  |  | No            |                  1 | On Loan: No      |
| Guidewire Software Inc                       | Guidewire Software Inc                       | CUSIP: 40171V100<br>LEI: 549300WXSG0J8IXZCK32 | Long             | EC               | CORP              | US        |      3792 | NS      | $237227.52    | 0.73%             |  |  |  | No            |                  1 | On Loan: No      |
| Etsy Inc                                     | Etsy Inc                                     | CUSIP: 29786A106<br>LEI: 54930089Q7XT501AEA40 | Long             | EC               | CORP              | US        |      4229 | NS      | $506549.62    | 1.56%             |  |  |  | No            |                  1 | On Loan: No      |
| CoStar Group Inc                             | CoStar Group Inc                             | CUSIP: 22160N109<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     15210 | NS      | $1175428.80   | 3.62%             |  |  |  | No            |                  1 | On Loan: No      |
| BWX Technologies Inc                         | BWX Technologies Inc                         | CUSIP: 05605H100<br>LEI: 549300NP85N265KWMS58 | Long             | EC               | CORP              | US        |     19514 | NS      | $1133373.12   | 3.49%             |  |  |  | No            |                  1 | On Loan: No      |
| Cadence Design Systems Inc                   | Cadence Design Systems Inc                   | CUSIP: 127387108<br>LEI: GCT7RXJOGLXPV0NXZY22 | Long             | EC               | CORP              | US        |      6915 | NS      | $1110825.60   | 3.42%             |  |  |  | No            |                  1 | On Loan: No      |
| SolarEdge Technologies Inc                   | SolarEdge Technologies Inc                   | CUSIP: 83417M104<br>LEI: 5493000K6Y58XXPDF853 | Long             | EC               | CORP              | US        |      2085 | NS      | $590617.95    | 1.82%             |  |  |  | No            |                  1 | On Loan: No      |
| Cameco Corp                                  | Cameco Corp                                  | CUSIP: 13321L108<br>LEI: N4BHALMXL3GMZKCUON55 | Long             | EC               | CORP              | CA        |     24170 | NS      | $547933.90    | 1.69%             |  |  |  | No            |                  1 | On Loan: No      |
| Bright Horizons Family Solutions Inc         | Bright Horizons Family Solutions Inc         | CUSIP: 109194100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |      4920 | NS      | $310452.00    | 0.95%             |  |  |  | No            |                  1 | On Loan: No      |
| Clarivate PLC                                | Clarivate PLC                                | CUSIP: 000000000<br>LEI: 549300WDHIIODXFO0R55 | Long             | EC               | CORP              | JE        |     56900 | NS      | $474546.00    | 1.46%             |  |  |  | No            |                  1 | On Loan: No      |
| SBA Communications Corp                      | SBA Communications Corp                      | CUSIP: 78410G104<br>LEI: 5299001HX8ZN8Y8QIT49 | Long             | EC               |  | US        |      1840 | NS      | $515770.40    | 1.59%             |  |  |  | No            |                  1 | On Loan: No      |
| Dexcom Inc                                   | Dexcom Inc                                   | CUSIP: 252131107<br>LEI: 549300YSK3QDSFR5EU59 | Long             | EC               | CORP              | US        |      8315 | NS      | $941590.60    | 2.90%             |  |  |  | No            |                  1 | On Loan: No      |
| Warner Music Group Corp                      | Warner Music Group Corp                      | CUSIP: 934550203<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     22325 | NS      | $781821.50    | 2.40%             |  |  |  | No            |                  1 | On Loan: No      |
| Palo Alto Networks Inc                       | Palo Alto Networks Inc                       | CUSIP: 697435105<br>LEI: 549300QXR2YVZV231H43 | Long             | EC               | CORP              | US        |      3915 | NS      | $546299.10    | 1.68%             |  |  |  | No            |                  1 | On Loan: No      |
| MKS Instruments Inc                          | MKS Instruments Inc                          | CUSIP: 55306N104<br>LEI: 549300KEQATBHAGVF505 | Long             | EC               | CORP              | US        |      6560 | NS      | $555828.80    | 1.71%             |  |  |  | No            |                  1 | On Loan: No      |
| Euronet Worldwide Inc                        | Euronet Worldwide Inc                        | CUSIP: 298736109<br>LEI: YG3575C4DSHJPA5KET68 | Long             | EC               | CORP              | US        |      9275 | NS      | $875374.50    | 2.69%             |  |  |  | No            |                  1 | On Loan: No      |
| Live Nation Entertainment Inc                | Live Nation Entertainment Inc                | CUSIP: 538034109<br>LEI: 5493007B9BM9ZXJINO78 | Long             | EC               | CORP              | US        |      8171 | NS      | $569845.54    | 1.75%             |  |  |  | No            |                  1 | On Loan: No      |
| Copart Inc                                   | Copart Inc                                   | CUSIP: 217204106<br>LEI: 549300KVYX3JWMYEHU61 | Long             | EC               | CORP              | US        |     18889 | NS      | $1150151.21   | 3.54%             |  |  |  | No            |                  1 | On Loan: No      |
| New Fortress Energy Inc                      | New Fortress Energy Inc                      | CUSIP: 644393100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     17648 | NS      | $748628.16    | 2.30%             |  |  |  | No            |                  1 | On Loan: No      |
| Builders FirstSource Inc                     | Builders FirstSource Inc                     | CUSIP: 12008R107<br>LEI: 549300W0SKP6L3H7DP63 | Long             | EC               | CORP              | US        |     10735 | NS      | $696486.80    | 2.14%             |  |  |  | No            |                  1 | On Loan: No      |
| Mettler-Toledo International Inc             | Mettler-Toledo International Inc             | CUSIP: 592688105<br>LEI: 5493000BD5GJNUDIUG10 | Long             | EC               | CORP              | US        |       515 | NS      | $744406.75    | 2.29%             |  |  |  | No            |                  1 | On Loan: No      |
| Performance Food Group Co                    | Performance Food Group Co                    | CUSIP: 71377A103<br>LEI: 549300EUK8GR9IT1YK57 | Long             | EC               | CORP              | US        |      9635 | NS      | $562587.65    | 1.73%             |  |  |  | No            |                  1 | On Loan: No      |
| Aptiv PLC                                    | Aptiv PLC                                    | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | JE        |      5145 | NS      | $479153.85    | 1.47%             |  |  |  | No            |                  1 | On Loan: No      |
| STERIS PLC                                   | STERIS PLC                                   | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | IE        |      2025 | NS      | $373997.25    | 1.15%             |  |  |  | No            |                  1 | On Loan: No      |
| IDEXX Laboratories Inc                       | IDEXX Laboratories Inc                       | CUSIP: 45168D104<br>LEI: OGMTXK0LUU1HKV2P0J84 | Long             | EC               | CORP              | US        |      1305 | NS      | $532387.80    | 1.64%             |  |  |  | No            |                  1 | On Loan: No      |
| PacWest Bancorp                              | PacWest Bancorp                              | CUSIP: 695263103<br>LEI: 549300YI8VMFO7G36V04 | Long             | EC               | CORP              | US        |     12795 | NS      | $293645.25    | 0.90%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2023-01-19

**Name of Applicant:** WILLIAM BLAIR FUNDS

**Signature:** John Raczek

**Name of Signer:** John Raczek

**Title:** Principal Financial Officer