# EDGAR Filing Document

**Accession Number:** 0000710124
**File Stem:** 0001193125-26-031593
**Filing Date:** 2026-1
**Character Count:** 7927
**Document Hash:** 766c1a2a770d817e90af65570e026583
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-031593.hdr.sgml**: 20260130

**ACCESSION NUMBER**: 0001193125-26-031593

**CONFORMED SUBMISSION TYPE**: 485BXT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260130

**DATE AS OF CHANGE**: 20260130

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NORTHERN INSTITUTIONAL FUNDS
- **CENTRAL INDEX KEY:** 0000710124

**ORGANIZATION NAME:**
- **EIN:** 363209613
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 485BXT
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-03605
- **FILM NUMBER:** 26582776

**BUSINESS ADDRESS:**
- **STREET 1:** NORTHERN INSTITUTIONAL FUNDS
- **STREET 2:** 50 SOUTH LASALLE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60603
- **BUSINESS PHONE:** 800-637-1380

**MAIL ADDRESS:**
- **STREET 1:** NORTHERN INSTITUTIONAL FUNDS
- **STREET 2:** 50 SOUTH LASALLE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60603

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BENCHMARK FUNDS
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BENCHMARK MONEY MARKET FUND DIVERSIFIED ASSETS & GOVERNMENT
- **DATE OF NAME CHANGE:** 19910422

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BENCHMARK MONEY MARKET FUND
- **DATE OF NAME CHANGE:** 19851020
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NORTHERN INSTITUTIONAL FUNDS
- **CENTRAL INDEX KEY:** 0000710124

**ORGANIZATION NAME:**
- **EIN:** 363209613
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 485BXT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-80543
- **FILM NUMBER:** 26582775

**BUSINESS ADDRESS:**
- **STREET 1:** NORTHERN INSTITUTIONAL FUNDS
- **STREET 2:** 50 SOUTH LASALLE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60603
- **BUSINESS PHONE:** 800-637-1380

**MAIL ADDRESS:**
- **STREET 1:** NORTHERN INSTITUTIONAL FUNDS
- **STREET 2:** 50 SOUTH LASALLE STREET
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60603

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BENCHMARK FUNDS
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BENCHMARK MONEY MARKET FUND DIVERSIFIED ASSETS & GOVERNMENT
- **DATE OF NAME CHANGE:** 19910422

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BENCHMARK MONEY MARKET FUND
- **DATE OF NAME CHANGE:** 19851020

## Series and Classes Contracts Data

### Treasury Instruments Portfolio (Series ID: S000058876)

| Class ID   | Class Name             | Ticker Symbol   |
|:---|:---|:---|
| C000271532 | DIGITAL ENABLED SHARES |  |

**As filed with the Securities and Exchange Commission on January 30, 2026** 

**Securities Act of 1933 Registration No. 2-80543** 

**Investment Company Act of 1940 Registration No. 811-03605** 

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM N-1A** 

**REGISTRATION STATEMENT** 

***UNDER***

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| | |
|:---|:---|
| ***THE SECURITIES ACT OF 1933*** | ☒ |
| **Pre-Effective Amendment No.** | ☐ |
| **Post-Effective Amendment No. 111** | ☒ |

---

**and/or** 

**REGISTRATION STATEMENT** 

***UNDER***

---

| | |
|:---|:---|
| ***THE INVESTMENT COMPANY ACT OF 1940*** | ☒ |
| **Amendment No. 144** | ☒ |

---

**(Check appropriate box or boxes)** 

## NORTHERN INSTITUTIONAL FUNDS
**(Exact Name of Registrant as Specified in Charter)** 

**50 S. LaSalle Street** 

**Chicago, Illinois 60603** 

**(Address of Principal Executive Offices)** 

**800-637-1380** 

**(Registrant's Telephone Number, including Area Code)** 

---

| | |
|:---|:---|
| **Name and Address of Agent for Service:** | **with a copy to:** |
| **Michael Mabry**<br> **Stradley Ronon Stevens & Young, LLP**<br> **2005 Market Street**<br> **Suite 2600**<br> **Philadelphia, Pennsylvania 19103** | **Kevin P. O'Rourke**<br> **Jose J. Del Real**<br> **The Northern Trust Company**<br> **50 South LaSalle Street**<br> **Chicago, Illinois 60603** |

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It Is Proposed That This Filing Become Effective (Check Appropriate Box):

☐ immediately upon filing pursuant to paragraph (b)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ on February 6, 2026 pursuant to paragraph (b)

☐ 60 days after filing pursuant to paragraph (a)(1)

☐ On (date) pursuant to paragraph (a)(1)

☐ 75 days after filing pursuant to paragraph (a)(2)

☐ On (date) pursuant to paragraph (a)(2)

If appropriate, check the following box:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

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\*This filing relates solely to Digital Enabled Shares of the Treasury Instruments Portfolio.

**Explanatory Note** 

This Post-Effective Amendment No. 111 under the Securities Act of 1933, as amended (the "Securities Act") (Amendment No. 144 under the Investment Company Act of 1940, as amended (the "1940 Act")) to the registration statement on Form N-1A (the "Registration Statement") of Northern Institutional Funds (the "Registrant") is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act solely for the purpose of delaying, until February 6, 2026, the effectiveness of the Registration Statement with respect to the Digital Enabled Shares of the Treasury Instruments Portfolio, initially filed in Post-Effective Amendment No. 110 on December 2, 2025, pursuant to paragraph (a)(2) of Rule 485 under the Securities Act, which would have become effective on February 2, 2026.

This Post-Effective Amendment No. 111 incorporates by reference the information contained in [Parts A, B and C of Post-Effective Amendment No. 110](http://www.sec.gov/Archives/edgar/data/710124/000119312525304804/d80721d485apos.htm).

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**SIGNATURES** 

Pursuant to the requirements of the Securities Act of 1933, as amended (the "Securities Act"), and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment No. 111 to its Registration Statement under Rule 485(b) under the Securities Act and the Registrant has duly caused this Post-Effective Amendment No. 111 to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Chicago and State of Illinois on the 30<sup>th</sup> day of January, 2026.

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| | |
|:---|:---|
|  NORTHERN INSTITUTIONAL FUNDS | NORTHERN INSTITUTIONAL FUNDS |
| By: | /s/ Kevin P. O'Rourke |
|  | Kevin P. O'Rourke<br> President |

---

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment No. 111 to the Registrant's Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

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| | | |
|:---|:---|:---|
| **Name** | **Title** | **Date** |
| /s/ Kevin P. O'Rourke<br> Kevin P. O'Rourke | President (Principal Executive Officer) | January 30, 2026 |
| /s/ Randal E. Rein<br> Randal E. Rein | Treasurer (Principal Financial and<br> Accounting Officer) | January 30, 2026 |
| /s/ Therese M. Bobek\*<br> Therese M. Bobek | Trustee | January 30, 2026 |
| /s/ Ingrid LaMae A. de Jongh\*<br> Ingrid LaMae A. de Jongh | Trustee | January 30, 2026 |
| /s/ Thomas A. Kloet\*<br> Thomas A. Kloet | Trustee | January 30, 2026 |
| /s/ David R. Martin\*<br> David R. Martin | Trustee | January 30, 2026 |
| /s/ William Martin\*<br> William Martin | Trustee | January 30, 2026 |

---

------

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| | | |
|:---|:---|:---|
| **Name** | **Title** | **Date** |
| /s/ Cynthia R. Plouché\*<br> Cynthia R. Plouché | Trustee | January 30, 2026 |
| /s/ Mary Jacobs Skinner\*<br> Mary Jacobs Skinner | Trustee | January 30, 2026 |
| /s/ Paula Kar\*<br> Paula Kar | Trustee | January 30, 2026 |
| /s/ Kevin P. O'Rourke<br> \*By Kevin P. O'Rourke<br> Attorney-In-Fact (pursuant to Power of Attorney previously filed) |  |  |

---