# EDGAR Filing Document

**Accession Number:** 0000889512
**File Stem:** 0001655589-26-000422
**Filing Date:** 2026-4
**Character Count:** 5090
**Document Hash:** dc2c03d444f155127b71bbee294d9da6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001655589-26-000422.hdr.sgml**: 20260417

**ACCESSION NUMBER**: 0001655589-26-000422

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260417

**DATE AS OF CHANGE**: 20260417

**EFFECTIVENESS DATE**: 20260417

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** LEGG MASON PARTNERS INSTITUTIONAL TRUST
- **CENTRAL INDEX KEY:** 0000889512

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0831

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-49552
- **FILM NUMBER:** 26869652

**BUSINESS ADDRESS:**
- **STREET 1:** LEGG MASON & CO., LLC
- **STREET 2:** 620 EIGHTH AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10018
- **BUSINESS PHONE:** 1-877-721-1926

**MAIL ADDRESS:**
- **STREET 1:** LEGG MASON & CO., LLC
- **STREET 2:** 620 EIGHTH AVENUE
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10018

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CITIFUNDS INSTITUTIONAL TRUST
- **DATE OF NAME CHANGE:** 19981030

## Series and Classes Contracts Data

### Western Asset SMASh Series C Fund (Series ID: S000014682)

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|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| SMASh Series C Fund | LMLCX         | C000040180 |

---

## Series and Classes Contracts Data

### Western Asset SMASh Series C Fund (Series ID: S000014682)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000040180 | SMASh Series C Fund | LMLCX           |

WSMAS-P1 04/26

---

| | |
|:---|:---|
| ![](img_03076cdca2684f1.jpg) | ![](img_0cf35054c85e4f1.jpg) |

---

**LEGG MASON PARTNERS INSTITUTIONAL TRUST**<br>**SUPPLEMENT DATED APRIL 17, 2026** <br>**TO THE PROSPECTUS AND**<br>**STATEMENT OF ADDITIONAL INFORMATION ("SAI")** <br>**DATED JULY 1, 2025, OF** <br>**WESTERN ASSET SMASH SERIES C FUND (THE "FUND")**<br>

#### All changes described below are effective May 1, 2026.
&nbsp;&nbsp;&nbsp;&nbsp;**I. The following is added to the section titled "Management – Investment professionals" in the Fund's Prospectus:** 

---

| | | |
|:---|:---|:---|
| **Investment professional** | **Title** | **Investment**<br>**professional of**<br>**the fund since** |
| Dan Alexander | Deputy CIO, Portfolio Manager | May 2026 |
| Molly Schwartz | Portfolio Manager | May 2026 |

---

&nbsp;&nbsp;&nbsp;&nbsp;**II. The following is added to the section titled "More on fund management – Investment professionals" in the Fund's Prospectus:** 

------

---

| | | |
|:---|:---|:---|
| **Investment professional** | **Title and recent**<br>**biography** | **Investment**<br>**professional of**<br>**the fund since** |
| Dan Alexander | Portfolio Manager and has been employed by Western Asset as an investment professional for at least the past five years<br>| May 2026 |
| Molly Schwartz | Portfolio Manager and has been employed by Western Asset as an investment professional for at least the past five years. | May 2026 |

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&nbsp;&nbsp;&nbsp;&nbsp;**III. The following is added to the table in the section titled "Investment Professionals – Other Accounts Managed by the Investment Professionals" in the Fund's SAI:** 

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Investment**<br>**Professionals**<br>| **Type of**<br>**Account**<br>| **Number of**<br>**Accounts**<br>**Managed** <br>| **Total** <br>**Assets<br>Managed<br>(Billions)** <br>**($)** <br>| **Number of**<br>**Accounts**<br>**Managed for**<br>**which Advisory**<br>**Fee is**<br>**Performance-**<br>**Based** <br>| **Assets**<br>**Managed for**<br>**which Advisory**<br>**Fee is**<br>**Performance-**<br>**Based**<br>**(Billions) ($)**<br>|
| Dan <br>Alexander\* | &nbsp;&nbsp;&nbsp;Registered Investment Companies | 4 | 1.02 |  |  |
|  | &nbsp;&nbsp;&nbsp;Other Pooled Investment Vehicles | 9 | 6.90 |  |  |
|  | &nbsp;&nbsp;&nbsp;Other Accounts | 53 | 22.87 | 4 | 1.51 |
| Molly <br>Scwartz\* | &nbsp;&nbsp;&nbsp;Registered Investment Companies | 4 | 1.02 |  |  |
|  | &nbsp;&nbsp;&nbsp;Other Pooled Investment Vehicles | 9 | 6.90 |  |  |
|  | &nbsp;&nbsp;&nbsp;Other Accounts | 54 | 24.73 | 4 | 1.51 |

---

\* The information is as of March 31, 2026.

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&nbsp;&nbsp;&nbsp;&nbsp;**IV. The following is added to the table in the section titled "Investment Professionals – Investment Professional Securities Ownership" in the Fund's SAI:** 

---

| | |
|:---|:---|
| **Investment Professionals**<br>| **Dollar Range of Ownership of Securities ($)** <br>|
| Dan Alexander\* | &nbsp;&nbsp;&nbsp;None |
| Molly Schwartz\* | &nbsp;&nbsp;&nbsp;None |

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\* The information is as of March 31, 2026.

&nbsp;&nbsp;&nbsp;&nbsp;**V. The following footnote is added following each reference to Julien Scholnick in the Summary Prospectus, Prospectus and SAI of each fund listed in Schedule A:**

\* Effective September 30, 2026, Julien Scholnick will step down as a member of the investment professional team for the fund.

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

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