# EDGAR Filing Document

**Accession Number:** 0001227155
**File Stem:** 0001104659-25-074602
**Filing Date:** 2025-8
**Character Count:** 11638
**Document Hash:** d378a17e6d0e2da63bfcd8a7c2b76f98
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-074602.hdr.sgml**: 20250806

**ACCESSION NUMBER**: 0001104659-25-074602

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250806

**DATE AS OF CHANGE**: 20250806

**EFFECTIVENESS DATE**: 20250806

**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:** 251188496

**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 |

---

### 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 |

---

### 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 |

---

## 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           |

### 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           |

### 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           |

**Statement of Additional Information Supplement**

**August 6, 2025**

Morgan Stanley Institutional Liquidity Funds

Supplement dated August 6, 2025 to the Morgan Stanley Institutional Liquidity Funds Statement of Additional Information dated February 28, 2025, as supplemented

**Government Portfolio**

**Government Securities Portfolio**

**Prime Portfolio**

**Treasury Portfolio**

**Treasury Securities Portfolio**

**(the "Funds")**

Effective immediately, the section of the Statement of Additional Information titled "General Information—Dividends and Capital Gains Distributions—Special Considerations for the Funds" will be deleted in its entirety and replaced with the following:

**Special Considerations for the Funds.** The Funds declare income dividends daily on each business day and pay them monthly to shareholders. Dividends are based on estimates of income, expenses and shareholder activity for the Funds. Actual income, expenses and shareholders activity may differ from estimates and differences, if any, will be included in the calculation of subsequent dividends.

If your purchase order is received in good order by a Fund prior to the below times, then you will be a shareholder of record as of that business day. You will no longer be a shareholder of record on the business day on which your redemption order is received in good order by the Fund prior to the below times.

---

| | |
|:---|:---|
| Government Portfolio<br>Treasury Portfolio | As of 5:00 p.m. Eastern time |
| Government Securities Portfolio<br>Treasury Securities Portfolio | As of 3:00 p.m. Eastern time |
| Prime Portfolio | As of 2:00 p.m. Eastern time |

---

With respect to all share classes except Advisor Class, if your purchase order is received in good order by a Fund prior to the above times, then you begin to earn dividends on that day. If your redemption order is received in good order by a Fund prior to the above times, you will not earn a dividend on that day. However, with respect to purchase (or redemption) orders placed with a Financial Intermediary prior to the above times and transmitted through a trading platform utilized by the Financial Intermediary, you may begin to earn dividends the next business day after (or continue to earn dividends through the day on which) your order is placed with the Financial Intermediary.

With respect to Advisor Class shares, if your purchase order is received in good order by a Fund prior to the above times, then you will begin to earn dividends the business day after your order is received in good order and if your redemption order is received in good order by the Fund prior to the above times, you will earn a dividend through that day.

Dividends declared for Saturdays, Sundays and holidays are payable to shareholders as of such respective times on the preceding business day on which the Fund was open for business. Net realized short-term capital gains, if any, of the Funds will be distributed whenever the Trustees determine that such distributions would be in the best interest of shareholders, but at least once a year. The Funds do not expect to realize any long-term capital gains. Should any such gains be realized, they will be distributed annually.

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

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