# EDGAR Filing Document

**Accession Number:** 0000081027
**File Stem:** 0000081027-25-000011
**Filing Date:** 2025-6
**Character Count:** 4117
**Document Hash:** 0037a3039bef5c5df8ca5e281780fef2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000081027-25-000011.hdr.sgml**: 20250623

**ACCESSION NUMBER**: 0000081027-25-000011

**CONFORMED SUBMISSION TYPE**: FWP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250623

**DATE AS OF CHANGE**: 20250623

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PUBLIC SERVICE CO OF OKLAHOMA
- **CENTRAL INDEX KEY:** 0000081027
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 730410895
- **STATE OF INCORPORATION:** OK
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-282058
- **FILM NUMBER:** 251064773

**BUSINESS ADDRESS:**
- **STREET 1:** 1 RIVERSIDE PLAZA
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215
- **BUSINESS PHONE:** 614-716-1000

**MAIL ADDRESS:**
- **STREET 1:** 1 RIVERSIDE PLAZA
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PUBLIC SERVICE CO OF OKLAHOMA
- **CENTRAL INDEX KEY:** 0000081027
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 730410895
- **STATE OF INCORPORATION:** OK
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP

**BUSINESS ADDRESS:**
- **STREET 1:** 1 RIVERSIDE PLAZA
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215
- **BUSINESS PHONE:** 614-716-1000

**MAIL ADDRESS:**
- **STREET 1:** 1 RIVERSIDE PLAZA
- **CITY:** COLUMBUS
- **STATE:** OH
- **ZIP:** 43215

Filed pursuant to Rule 433

Registration No. 333-282058

June 23, 2025

**PRICING TERM SHEET**

---

| | |
|:---|:---|
| Issuer: | Public Service Company of Oklahoma |
| Expected Ratings\*: | Baa1 (stable) by Moody's Investors Service, Inc. <br>BBB+ (negative) by S&P Global Ratings, a division of S&P Global Inc.<br>A- (stable) by Fitch Ratings, Inc. |
| Designation: | Senior Notes, Series N, due 2036 |
| Principal Amount: | $800000000 |
| Maturity: | January 15, 2036 |
| Coupon: | 5.45% |
| Interest Payment Dates: | January 15 and July 15 |
| First Interest Payment Date: | January 15, 2026 |
| Day Count Convention | 30/360 |
| Treasury Benchmark: | 4.250% due May 15, 2035 |
| Treasury Yield: | 4.310% |
| Reoffer Spread: | T+115 basis points |
| Yield to Maturity: | 5.460% |
| Price to Public: | 99.916% of the principal amount thereof |
| Transaction Date: | June 23, 2025 |
| Settlement Date: | June 25, 2025 (T+2) |
| Redemption Terms: |  |
| &nbsp;&nbsp;&nbsp;Make-whole call: | Prior to October 15, 2035 at a discount rate of the Treasury Rate plus 20 basis points |
| &nbsp;&nbsp;&nbsp;Par call: | On or after October 15, 2035 at par |
| Minimum Denomination: | $2,000 and integral multiples of $1,000 in excess thereof |
| CUSIP/ISIN: | 744533 BS8/US744533BS89 |
| Joint Book-Running Managers: | Credit Agricole Securities (USA) Inc.<br>MUFG Securities Americas Inc.<br>SMBC Nikko Securities America, Inc.<br>TD Securities (USA) LLC<br>Guggenheim Securities, LLC |
| Co-Manager: | Fifth Third Securities, Inc. |

---

**\*Note:** A securities rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time.

**The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus if you request it by contacting Credit Agricole Securities (USA) Inc. toll-free at (866) 807-6030, MUFG Securities Americas Inc. toll-free at (877) 649-6848, SMBC Nikko Securities America, Inc. collect at (212) 224-5135 or TD Securities (USA) LLC toll-free at (855) 495-9846.**

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