# EDGAR Filing Document

**Accession Number:** 0002086973
**File Stem:** 0001445546-26-000184
**Filing Date:** 2026-1
**Character Count:** 2508
**Document Hash:** e749f65f4cf1d6902ae224833438b3c0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001445546-26-000184.hdr.sgml**: 20260108

**ACCESSION NUMBER**: 0001445546-26-000184

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260108

**DATE AS OF CHANGE**: 20260108

**EFFECTIVENESS DATE**: 20260108

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FT 12664
- **CENTRAL INDEX KEY:** 0002086973

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** IL
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-291412
- **FILM NUMBER:** 26517892

**BUSINESS ADDRESS:**
- **STREET 1:** 120 EAST LIBERTY DRIVE, SUITE 400
- **STREET 2:** C/O FIRST TRUST PORTFOLIOS L.P.
- **CITY:** WHEATON
- **STATE:** IL
- **ZIP:** 60187
- **BUSINESS PHONE:** 630 765 8000

**MAIL ADDRESS:**
- **STREET 1:** 120 EAST LIBERTY DRIVE, SUITE 400
- **STREET 2:** C/O FIRST TRUST PORTFOLIOS L.P.
- **CITY:** WHEATON
- **STATE:** IL
- **ZIP:** 60187

```

                         FIRST TRUST PORTFOLIOS L.P.
                            120 EAST LIBERTY DRIVE
                           WHEATON, ILLINOIS 60187

                               January 8, 2026

Securities and Exchange Commission
100 F Street NE
Washington D.C. 20549

Attn:     Filing Desk, Stop 1-4

Re:                                FT 12664
                   (File No. 333-291412) (CIK No. 2086973)

Ladies and Gentlemen:

     In  accordance  with   the  provisions  of   Rule  497(j)  of  Regulation
C  under  the  Securities  Act  of  1933  (the "Securities Act")  this  letter
serves  to  certify  that  the  most  recent  Amendment  to  the  Registration
Statement on  Form S-6 for the above captioned Trust does not differ from that
which would have  been filed pursuant to  Rule 497(b)  of  the Securities Act.
Amendment No.  1,  which  was  the  most recent Amendment to  the Registration
Statement, was filed electronically with the Commission on January 6, 2026.

                                    Very truly yours,
                                           FT 12664, Registrant

                                    By:   First Trust Portfolios L.P.
                                          ___________________________
                                          Depositor

                                    By:   /s/ Ronda L. Saeli-Chiappe
                                          __________________________
                                          Senior Vice President

```