# EDGAR Filing Document

**Accession Number:** 0001995668
**File Stem:** 0001193125-26-199810
**Filing Date:** 2026-5
**Character Count:** 1909
**Document Hash:** eb98fa0b9847058b0ae8016a926a888e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-199810.hdr.sgml**: 20260501

**ACCESSION NUMBER**: 0001193125-26-199810

**CONFORMED SUBMISSION TYPE**: 424B3

**PUBLIC DOCUMENT COUNT**: 9

**FILED AS OF DATE**: 20260501

**DATE AS OF CHANGE**: 20260501

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NYLI MacKay Muni Income Opportunities Fund
- **CENTRAL INDEX KEY:** 0001995668

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

**FILING VALUES:**
- **FORM TYPE:** 424B3
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-274888
- **FILM NUMBER:** 26929621

**BUSINESS ADDRESS:**
- **STREET 1:** 51 MADISON AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10010
- **BUSINESS PHONE:** 212-576-7000

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MainStay MacKay Municipal Income Opportunities Fund
- **DATE OF NAME CHANGE:** 20230929

?xml version='1.0' encoding='ASCII'? MainStay MacKay Municipal Income Opportunities Fund

#### Filed pursuant to Rule 424(b)(3) File No. 333-274888

#### NYLI MACKAY MUNI INCOME OPPORTUNITIES FUND
Supplement dated May 1, 2026 ("Supplement") to the

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 Prospectus and SAI.

The Board of Trustees of NYLI MacKay Muni Income Opportunities Fund (the "Fund") considered and approved the following change which will take place on or around August 28, 2026:

The name of the Fund will change from NYLI MacKay Muni Income Opportunities Fund to NYLIM MacKay Muni Income Opportunities Fund.

#### PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.
REG-00125-05/26