# EDGAR Filing Document

**Accession Number:** 0000883618
**File Stem:** 0001999371-25-016420
**Filing Date:** 2025-10
**Character Count:** 2846
**Document Hash:** 821f9a209fd09e445b42b65f9fd45b16
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-25-016420.hdr.sgml**: 20251029

**ACCESSION NUMBER**: 0001999371-25-016420

**CONFORMED SUBMISSION TYPE**: 425

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251029

**DATE AS OF CHANGE**: 20251029

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NUVEEN CALIFORNIA SELECT TAX FREE INCOME PORTFOLIO
- **CENTRAL INDEX KEY:** 0000885732

**ORGANIZATION NAME:**
- **EIN:** 363828111
- **STATE OF INCORPORATION:** MA

**FILING VALUES:**
- **FORM TYPE:** 425
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-06623
- **FILM NUMBER:** 251430078

**BUSINESS ADDRESS:**
- **STREET 1:** 333 W WACKER DR
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3129178200

**MAIL ADDRESS:**
- **STREET 1:** 333 W WACKER DRIVE
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NUVEEN INSURED CALIFORNIA SELECT TAX FREE INCOME PORTFOLIO
- **DATE OF NAME CHANGE:** 19920929

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NUVEEN CALIFORNIA SELECT TAX FREE INCOME PORTFOLIO
- **DATE OF NAME CHANGE:** 19600201
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NUVEEN SELECT TAX FREE INCOME PORTFOLIO
- **CENTRAL INDEX KEY:** 0000883618

**ORGANIZATION NAME:**
- **EIN:** 363806843
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 425

**BUSINESS ADDRESS:**
- **STREET 1:** 333 W WACKER DR
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3129178200

**MAIL ADDRESS:**
- **STREET 1:** 333 W WACKER DR
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606

---

| | |
|:---|:---|
| <br>**PO Box 43131**<br> **Providence, RI 02940-3131** | Filed by Nuveen Select Tax-Free Income Portfolio<br> (Commission File No. 333-288619)<br> pursuant to Rule 425 under the Securities Act of 1933, as<br> amended, and deemed filed pursuant to Rule 14a-6 under<br> the Securities Exchange Act of 1934, as amended<br> Subject Company: Nuveen California Select Tax-Free Income Portfolio<br> (Commission File No. 811-06623)<br>|

---

**RESPONSE NEEDED**

------

Re: Your investment in Nuveen Funds

Dear Shareholder:

We have been trying to contact you regarding an important proposal pertaining to your investment in one or more Nuveen Funds.

Please call us toll-free at

**1-888-686-7765**

Please respond as soon as possible with the Reference Number listed above. The call will take only a few moments.

**Because your vote is critical, our outreach to you will continue until there is sufficient voting.**

**You will not be asked for confidential information and your call will be recorded for your protection.**

Hours of Operation:

● Monday through Friday - 10:00 a.m. to 11:00 p.m. ET

● Saturday - 12:00 p.m. to 6:00 p.m. ET

Thank you in advance for your participation.