# EDGAR Filing Document

**Accession Number:** 0001227155
**File Stem:** 0001104659-26-052708
**Filing Date:** 2026-4
**Character Count:** 10157
**Document Hash:** 17d45bb66064a75322ef68719c33a9c3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-052708.hdr.sgml**: 20260430

**ACCESSION NUMBER**: 0001104659-26-052708

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260430

**DATE AS OF CHANGE**: 20260430

**EFFECTIVENESS DATE**: 20260430

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MORGAN STANLEY INSTITUTIONAL LIQUIDITY FUNDS
- **CENTRAL INDEX KEY:** 0001227155

**ORGANIZATION NAME:**
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-104972
- **FILM NUMBER:** 26923654

**BUSINESS ADDRESS:**
- **STREET 1:** 1585 BROADWAY
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036
- **BUSINESS PHONE:** 800-548-7786

**MAIL ADDRESS:**
- **STREET 1:** 1585 BROADWAY
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10036

## Series and Classes Contracts Data

### Government Portfolio (Series ID: S000004148)

---

|  |  |  |
|:---|:---|:---|
| Class Name                 | Ticker Symbol | Class ID   |
| Administrative Class       | MGOXX         | C000011654 |
| Advisory Class             | MAYXX         | C000011655 |
| Institutional Class        | MVRXX         | C000011656 |
| Investor Class             | MVVXX         | C000011657 |
| Participant Class          | MPCXX         | C000011658 |
| Institutional Select Class | MGSXX         | C000011659 |
| Cash Management Class      | MSGXX         | C000017907 |
| Select Class               | MSDXX         | C000167931 |
| CastleOak Share Class      | COSXX         | C000227505 |
| Impact Class               | IMPXX         | C000234745 |
| Impact Partner Class       | IPGXX         | C000248673 |
| Advisor Class              | MALXX         | C000248991 |
| Institutional Plus Class   | MPXXX         | C000263898 |

---

### Government Securities Portfolio (Series ID: S000004149)

---

|  |  |  |
|:---|:---|:---|
| Class Name                 | Ticker Symbol | Class ID   |
| Administrative Class       | MGAXX         | C000011660 |
| Advisory Class             | MVAXX         | C000011661 |
| Institutional Class        | MUIXX         | C000011662 |
| Investor Class             | MVIXX         | C000011663 |
| Participant Class          | MGPXX         | C000011664 |
| Institutional Select Class | MSVXX         | C000011665 |
| Cash Management Class      | MCHXX         | C000017908 |

---

### Prime Portfolio (Series ID: S000004151)

---

|  |  |  |
|:---|:---|:---|
| Class Name                 | Ticker Symbol | Class ID   |
| Administrative Class       | MPMXX         | C000011672 |
| Advisory Class             | MAVXX         | C000011673 |
| Institutional Class        | MPFXX         | C000011674 |
| Participant Class          | MPNXX         | C000011675 |
| Investor Class             | MPVXX         | C000011676 |
| Institutional Select Class | MPEXX         | C000011677 |
| Cash Management Class      | MSPXX         | C000017910 |
| Impact Class               | IMTXX         | C000234746 |
| CastleOak Share Class      | CASXX         | C000238341 |
| Impact Partner Class       | IPYXX         | C000248674 |

---

### Treasury Portfolio (Series ID: S000004153)

---

|  |  |  |
|:---|:---|:---|
| Class Name                 | Ticker Symbol | Class ID   |
| Administrative Class       | MTTXX         | C000011684 |
| Advisory Class             | MAOXX         | C000011685 |
| Institutional Class        | MISXX         | C000011686 |
| Investor Class             | MTNXX         | C000011687 |
| Participant Class          | MTCXX         | C000011688 |
| Institutional Select Class | MTSXX         | C000011689 |
| Cash Management Class      | MREXX         | C000017912 |
| Select Class               | MSTXX         | C000167932 |
| Advisor Class              | MATXX         | C000248994 |
| Institutional Plus Class   | MRXXX         | C000263899 |

---

### Treasury Securities Portfolio (Series ID: S000004154)

---

|  |  |  |
|:---|:---|:---|
| Class Name                 | Ticker Symbol | Class ID   |
| Administrative Class       | MAMXX         | C000011690 |
| Advisory Class             | MVYXX         | C000011691 |
| Institutional Class        | MSUXX         | C000011692 |
| Investor Class             | MNVXX         | C000011693 |
| Participant Class          | MPRXX         | C000011694 |
| Institutional Select Class | MSSXX         | C000011695 |
| Cash Management Class      | MHSXX         | C000017913 |
| Select Class               | MSEXX         | C000167933 |
| Impact Class               | IMXXX         | C000248675 |
| Impact Partner Class       | IPUXX         | C000248676 |
| Advisor Class              | MAZXX         | C000251131 |
| Institutional Plus Class   | MSXXX         | C000263900 |

---

## Series and Classes Contracts Data

### Government Portfolio (Series ID: S000004148)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000011654 | Administrative Class       | MGOXX           |
| C000011655 | Advisory Class             | MAYXX           |
| C000011656 | Institutional Class        | MVRXX           |
| C000011657 | Investor Class             | MVVXX           |
| C000011658 | Participant Class          | MPCXX           |
| C000011659 | Institutional Select Class | MGSXX           |
| C000017907 | Cash Management Class      | MSGXX           |
| C000167931 | Select Class               | MSDXX           |
| C000227505 | CastleOak Share Class      | COSXX           |
| C000234745 | Impact Class               | IMPXX           |
| C000248673 | Impact Partner Class       | IPGXX           |
| C000248991 | Advisor Class              | MALXX           |
| C000263898 | Institutional Plus Class   | MPXXX           |

### Government Securities Portfolio (Series ID: S000004149)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000011660 | Administrative Class       | MGAXX           |
| C000011661 | Advisory Class             | MVAXX           |
| C000011662 | Institutional Class        | MUIXX           |
| C000011663 | Investor Class             | MVIXX           |
| C000011664 | Participant Class          | MGPXX           |
| C000011665 | Institutional Select Class | MSVXX           |
| C000017908 | Cash Management Class      | MCHXX           |

### Prime Portfolio (Series ID: S000004151)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000011672 | Administrative Class       | MPMXX           |
| C000011673 | Advisory Class             | MAVXX           |
| C000011674 | Institutional Class        | MPFXX           |
| C000011675 | Participant Class          | MPNXX           |
| C000011676 | Investor Class             | MPVXX           |
| C000011677 | Institutional Select Class | MPEXX           |
| C000017910 | Cash Management Class      | MSPXX           |
| C000234746 | Impact Class               | IMTXX           |
| C000238341 | CastleOak Share Class      | CASXX           |
| C000248674 | Impact Partner Class       | IPYXX           |

### Treasury Portfolio (Series ID: S000004153)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000011684 | Administrative Class       | MTTXX           |
| C000011685 | Advisory Class             | MAOXX           |
| C000011686 | Institutional Class        | MISXX           |
| C000011687 | Investor Class             | MTNXX           |
| C000011688 | Participant Class          | MTCXX           |
| C000011689 | Institutional Select Class | MTSXX           |
| C000017912 | Cash Management Class      | MREXX           |
| C000167932 | Select Class               | MSTXX           |
| C000248994 | Advisor Class              | MATXX           |
| C000263899 | Institutional Plus Class   | MRXXX           |

### Treasury Securities Portfolio (Series ID: S000004154)

| Class ID   | Class Name                 | Ticker Symbol   |
|:---|:---|:---|
| C000011690 | Administrative Class       | MAMXX           |
| C000011691 | Advisory Class             | MVYXX           |
| C000011692 | Institutional Class        | MSUXX           |
| C000011693 | Investor Class             | MNVXX           |
| C000011694 | Participant Class          | MPRXX           |
| C000011695 | Institutional Select Class | MSSXX           |
| C000017913 | Cash Management Class      | MHSXX           |
| C000167933 | Select Class               | MSEXX           |
| C000248675 | Impact Class               | IMXXX           |
| C000248676 | Impact Partner Class       | IPUXX           |
| C000251131 | Advisor Class              | MAZXX           |
| C000263900 | Institutional Plus Class   | MSXXX           |

**Statement of Additional Information Supplement**

**April 30, 2026**

Morgan Stanley Institutional Liquidity Funds

Supplement dated April 30, 2026 to the Morgan Stanley Institutional Liquidity Funds Statement of Additional Information dated February 27, 2026

**Government Portfolio**

**Government Securities Portfolio**

**Prime Portfolio**

**Treasury Portfolio**

**Treasury Securities Portfolio**

Effective immediately, the table in the section of the Statement of Additional Information entitled "Disclosure of Portfolio Holdings" is hereby deleted and replaced with the following:

---

| | | |
|:---|:---|:---|
| **Name** | **Frequency<sup>1</sup>** | **Lag Time** |
| **Service Providers** |  |  |
| State Street Bank and <br>Trust Company | Daily basis | Daily |
| BlackRock Financial <br>Management Inc. | Daily basis | <sup>2</sup> |
| KellyCo Marketing | As needed | Varying lag times after the date of <br>the information |
| Financial Recovery Technologies | Daily basis | Daily |
| **Portfolio Analytics Providers** |  |  |
| Bloomberg Finance, L.P. | Daily basis | <sup>2</sup> |
| Abel Noser Solutions, LLC | Daily basis | Daily |

---

1 Dissemination of portfolio holdings information to entities listed above may occur less frequently than indicated (or not at all).

2 Information will typically be provided on a real time basis or as soon thereafter as possible.

**Please retain this supplement for future reference.**

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