# EDGAR Filing Document

**Accession Number:** 0000844779
**File Stem:** 0001193125-23-063187
**Filing Date:** 2023-3
**Character Count:** 2229
**Document Hash:** 4308fbc1ceea9eafdd112660213a8cc5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-063187.hdr.sgml**: 20230307

**ACCESSION NUMBER**: 0001193125-23-063187

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230307

**DATE AS OF CHANGE**: 20230307

**EFFECTIVENESS DATE**: 20230307

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BLACKROCK FUNDS
- **CENTRAL INDEX KEY:** 0000844779
- **IRS NUMBER:** 510318674
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-26305
- **FILM NUMBER:** 23713856

**BUSINESS ADDRESS:**
- **STREET 1:** 100 BELLEVUE PARKWAY
- **CITY:** WILMINGTON
- **STATE:** DE
- **ZIP:** 19809
- **BUSINESS PHONE:** 800-441-7762

**MAIL ADDRESS:**
- **STREET 1:** 100 BELLEVUE PARKWAY
- **CITY:** WILMINGTON
- **STATE:** DE
- **ZIP:** 19809

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COMPASS CAPITAL FUNDS\
- **DATE OF NAME CHANGE:** 19961114

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PNC FUND
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NCP FUNDS
- **DATE OF NAME CHANGE:** 19890511

## Series and Classes Contracts Data

### Circle Reserve Fund (Series ID: S000077205)

---

|  |  |
|:---|:---|
| Class Name           | Class ID   |
| Institutional Shares | C000237396 |

---

## Series and Classes Contracts Data

### Circle Reserve Fund (Series ID: S000077205)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000237396 | Institutional Shares |  |

**BlackRock Funds<sup>SM</sup>** 

**Circle Reserve Fund** 

**(the "Fund")** 

**Supplement dated March 7, 2023 to the Prospectus of the Fund, dated September 1, 2022, as supplemented to date** 

**Effective immediately, any references to the Fund's P.O. Box are deleted and replaced with:** 

P.O. Box 534402

Pittsburgh, Pennsylvania 15253-4402

**Effective immediately, any references to a Fund's overnight mailing address are deleted and replaced with:** 

BlackRock Funds

Circle Reserve Fund

Attention: 534402

500 Ross Street 154-0520

Pittsburgh, Pennsylvania 15262

**Shareholders should retain this Supplement for future reference.** 

PRO-CRF-0323SUP