# EDGAR Filing Document

**Accession Number:** 0000787441
**File Stem:** 0000787441-26-000028
**Filing Date:** 2026-3
**Character Count:** 4219
**Document Hash:** c5d90d2bf76e32c3618b8acd1f5a82dc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000787441-26-000028.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0000787441-26-000028

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**EFFECTIVENESS DATE**: 20260305

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NEW YORK LIFE INVESTMENTS FUNDS
- **CENTRAL INDEX KEY:** 0000787441

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-02610
- **FILM NUMBER:** 26726981

**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:** MAINSTAY FUNDS
- **DATE OF NAME CHANGE:** 19920703

**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

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

---

|  |  |  |
|:---|:---|:---|
| Class Name     | Ticker Symbol | Class ID   |
| Class A        | MTRAX         | C000018706 |
| Class C        | MCTRX         | C000018708 |
| Class I        | MTOIX         | C000018709 |
| INVESTOR CLASS | MTINX         | C000060796 |
| Class R6       | MTODX         | C000185564 |
| SIMPLE CLASS   | MTISX         | C000221696 |

---

## Series and Classes Contracts Data

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

| Class ID   | Class Name     | Ticker Symbol   |
|:---|:---|:---|
| C000018706 | Class A        | MTRAX           |
| C000018708 | Class C        | MCTRX           |
| C000018709 | Class I        | MTOIX           |
| C000060796 | INVESTOR CLASS | MTINX           |
| C000185564 | Class R6       | MTODX           |
| C000221696 | SIMPLE CLASS   | MTISX           |

#### NEW YORK LIFE INVESTMENTS FUNDS <br> NYLI Income Builder Fund

#### (the "Fund")
<br>Supplement dated March 5, 2026 ("Supplement") to the <br>Summary Prospectus, Prospectus and Statement of Additional Information ("SAI"), each dated February 28, 2026

*Capitalized terms and certain other terms used in this Supplement, unless otherwise defined in this Supplement, have the meanings assigned to them in the Summary Prospectus, Prospectus and SAI.*

<br>Effective immediately, William J. Booth will become a portfolio manager for the Fund. Other than this addition, the portfolio management team for the Fund will remain unchanged.

The table in the section entitled **"Management"** of the Fund's Summary Prospectus and Prospectus is amended to include the following:

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Subadvisor** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Portfolio Manager** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Service Date** |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Epoch Investment Partners, Inc. | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;William J. Booth, Managing Director | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Since March 2026 |

---

The subsection entitled **"Portfolio Manager Biographies"** under the section **"Know With Whom You Are Investing"** in the Prospectus is amended to include the following:

---

| | |
|:---|:---|
| William J. Booth, CFA | &nbsp;&nbsp;Mr. Booth has been a portfolio manager of the NYLI Income Builder Fund since March 2026. Mr. Booth joined Epoch in 2009, where he is a Managing Director and Chief Investment Officer. Prior to joining Epoch, Mr. Booth was a consumer and retail analyst at PioneerPath Capital, which is a long/short equity hedge fund. Mr. Booth holds a BS in Chemical Engineering from Yale University and an MBA from New York University's Leonard N. Stern School of Business. He also holds the chartered Financial Analyst<sup>®</sup> ("CFA<sup>®</sup>") designation. |

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#### PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE
REG-00113-03/26

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