# EDGAR Filing Document

**Accession Number:** 0000787441
**File Stem:** 0001741773-23-000833
**Filing Date:** 2023-3
**Character Count:** 8360
**Document Hash:** c217843ab642a39c8ca67810188292b1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001741773-23-000833.hdr.sgml**: 20230301

**ACCESSION NUMBER**: 0001741773-23-000833

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230301

**DATE AS OF CHANGE**: 20230301

**EFFECTIVENESS DATE**: 20230301

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MAINSTAY FUNDS
- **CENTRAL INDEX KEY:** 0000787441
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-02610
- **FILM NUMBER:** 23692293

**BUSINESS ADDRESS:**
- **STREET 1:** 51 MADISON AVE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10010
- **BUSINESS PHONE:** 2125767000

**MAIL ADDRESS:**
- **STREET 1:** 51 MADISON AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10010

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MACKAY SHIELDS MAINSTAY SERIES FUND /NY/
- **DATE OF NAME CHANGE:** 19911126

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MACKAY SHIELDS SERIES FUND
- **DATE OF NAME CHANGE:** 19860506

## Series and Classes Contracts Data

### MainStay MacKay Strategic Bond Fund (Series ID: S000006894)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018685 | Class A        | MASAX           |
| C000018686 | Class B        | MASBX           |
| C000018687 | Class C        | MSICX           |
| C000018688 | Class I        | MSDIX           |
| C000060790 | INVESTOR CLASS | MSYDX           |
| C000138226 | Class R2       | MSIRX           |
| C000166834 | Class R3       | MSDJX           |
| C000185554 | Class R6       | MSYEX           |

### MainStay MacKay U.S. Infrastructure Bond Fund (Series ID: S000006895)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018689 | Class A        | MGVAX           |
| C000018690 | Class B        | MCSGX           |
| C000018691 | Class C        | MGVCX           |
| C000018692 | Class I        | MGOIX           |
| C000060791 | INVESTOR CLASS | MGVNX           |
| C000185556 | Class R6       | MGVDX           |

### MainStay MacKay High Yield Corporate Bond Fund (Series ID: S000006896)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018693 | Class A        | MHCAX           |
| C000018694 | Class B        | MKHCX           |
| C000018695 | Class C        | MYHCX           |
| C000018696 | Class I        | MHYIX           |
| C000057099 | Class R2       | MHYRX           |
| C000060792 | INVESTOR CLASS | MHHIX           |
| C000116272 | Class R1       | MHHRX           |
| C000127160 | Class R6       | MHYSX           |
| C000166835 | Class R3       | MHYTX           |
| C000221691 | SIMPLE CLASS   | MHHSX           |

### MainStay Money Market Fund (Series ID: S000006897)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018697 | Class A        | MMAXX           |
| C000018698 | Class B        | MKMXX           |
| C000018699 | Class C        | MSCXX           |
| C000060793 | INVESTOR CLASS | MKTXX           |
| C000221692 | SIMPLE CLASS   | MIPXX           |

### MainStay MacKay Tax Free Bond Fund (Series ID: S000006898)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018700 | Class A        | MTBAX           |
| C000018701 | Class B        | MKTBX           |
| C000018702 | Class C        | MTFCX           |
| C000060794 | INVESTOR CLASS | MKINX           |
| C000082082 | Class I        | MTBIX           |
| C000185560 | Class R6       | MTBDX           |
| C000221693 | Class C2       | MTSPX           |

### MainStay MacKay Convertible Fund (Series ID: S000006899)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018703 | Class A        | MCOAX           |
| C000018704 | Class B        | MCSVX           |
| C000018705 | Class C        | MCCVX           |
| C000060795 | INVESTOR CLASS | MCINX           |
| C000087595 | Class I        | MCNVX           |

### MainStay Income Builder Fund (Series ID: S000006900)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018706 | Class A        | MTRAX           |
| C000018707 | Class B        | MKTRX           |
| C000018708 | Class C        | MCTRX           |
| C000018709 | Class I        | MTOIX           |
| C000060796 | INVESTOR CLASS | MTINX           |
| C000153007 | Class R2       | MTXRX           |
| C000166836 | Class R3       | MTXVX           |
| C000185564 | Class R6       | MTODX           |
| C000221696 | SIMPLE CLASS   | MTISX           |

### MainStay Candriam Emerging Markets Debt Fund (Series ID: S000006901)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018710 | Class A        | MGHAX           |
| C000018711 | Class B        | MGHBX           |
| C000018712 | Class C        | MHYCX           |
| C000052120 | Class I        | MGHIX           |
| C000060797 | INVESTOR CLASS | MGHHX           |

### MainStay MacKay International Equity Fund (Series ID: S000006902)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018713 | Class A        | MSEAX           |
| C000018714 | Class B        | MINEX           |
| C000018715 | Class C        | MIECX           |
| C000018716 | Class I        | MSIIX           |
| C000018717 | Class R1       | MIERX           |
| C000018718 | Class R2       | MIRRX           |
| C000030957 | Class R3       | MIFRX           |
| C000060798 | INVESTOR CLASS | MINNX           |
| C000185568 | Class R6       | MIFDX           |

### MainStay WMC Enduring Capital Fund (Series ID: S000006903)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018719 | Class A        | MSOAX           |
| C000018720 | Class B        | MOPBX           |
| C000018721 | Class C        | MGOCX           |
| C000018722 | Class I        | MSOIX           |
| C000057100 | Class R2       | MSORX           |
| C000060799 | INVESTOR CLASS | MCSSX           |
| C000166837 | Class R3       | MSOSX           |
| C000179143 | Class R6       | MCSDX           |

### MainStay Winslow Large Cap Growth Fund (Series ID: S000006905)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018724 | Class A        | MLAAX           |
| C000018725 | Class B        | MLABX           |
| C000018726 | Class C        | MLACX           |
| C000018727 | Class I        | MLAIX           |
| C000018728 | Class R1       | MLRRX           |
| C000018729 | Class R2       | MLRTX           |
| C000030958 | Class R3       | MLGRX           |
| C000060800 | INVESTOR CLASS | MLINX           |
| C000127162 | Class R6       | MLRSX           |
| C000221700 | SIMPLE CLASS   | MLRMX           |

### MainStay WMC Value Fund (Series ID: S000006906)

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018730 | Class A        | MAPAX           |
| C000018731 | Class B        | MAPBX           |
| C000018732 | Class C        | MMPCX           |
| C000018733 | Class I        | MUBFX           |
| C000018734 | Class R1       | MAPRX           |
| C000018735 | Class R2       | MPRRX           |
| C000030959 | Class R3       | MMAPX           |
| C000060801 | INVESTOR CLASS | MSMIX           |
| C000185571 | Class R6       | MMPDX           |

#### THE MAINSTAY FUNDS <br> 51 Madison Avenue <br> New York, NY 10010
March 1, 2023

#### VIA EDGAR
Securities and Exchange Commission<br>Division of Investment Management<br>100 F Street, N.E.<br>Washington, D.C. 20549<br>

Re: The MainStay Funds (the "Registrant")<br>Registration Numbers: 033-02610 and 811-04550

Dear Sir or Madam:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended ("1933 Act"), the Registrant hereby certifies that the Prospectuses and Statement of Additional Information that would have been filed under paragraph (c) of Rule 497 do not differ from those contained in Post-Effective Amendment No. 162 to the Registrant's Registration Statement on Form N-1A under the 1933 Act and Amendment No. 165 under the Investment Company Act of 1940, that became effective on February 28, 2023.

No fee is required in connection with this filing. Please direct any questions concerning the filing to the undersigned at 201-744-3598.

Very truly yours, <br>

<u>/s/ Brian J. McGrady</u>

Brian J. McGrady<br>Assistant Secretary

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