# EDGAR Filing Document

**Accession Number:** 0000066904
**File Stem:** 0000066904-26-000004
**Filing Date:** 2026-2
**Character Count:** 7459
**Document Hash:** e4c1102fe808b1f83f299ec5efd2bfa9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000066904-26-000004.hdr.sgml**: 20260227

**ACCESSION NUMBER**: 0000066904-26-000004

**CONFORMED SUBMISSION TYPE**: FWP

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260227

**DATE AS OF CHANGE**: 20260227

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MISSISSIPPI POWER CO
- **CENTRAL INDEX KEY:** 0000066904
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 640205820
- **STATE OF INCORPORATION:** MS
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** FWP
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 333-273697
- **FILM NUMBER:** 26695176

**BUSINESS ADDRESS:**
- **STREET 1:** 2992 WEST BEACH
- **CITY:** GULFPORT
- **STATE:** MS
- **ZIP:** 39501
- **BUSINESS PHONE:** 2288641211

**MAIL ADDRESS:**
- **STREET 1:** 2992 WEST BEACH
- **CITY:** GULFPORT
- **STATE:** MS
- **ZIP:** 39501
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MISSISSIPPI POWER CO
- **CENTRAL INDEX KEY:** 0000066904
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 640205820
- **STATE OF INCORPORATION:** MS
- **FISCAL YEAR END:** 1231

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

**BUSINESS ADDRESS:**
- **STREET 1:** 2992 WEST BEACH
- **CITY:** GULFPORT
- **STATE:** MS
- **ZIP:** 39501
- **BUSINESS PHONE:** 2288641211

**MAIL ADDRESS:**
- **STREET 1:** 2992 WEST BEACH
- **CITY:** GULFPORT
- **STATE:** MS
- **ZIP:** 39501

**Filed Pursuant to Rule 433**

**Registration No. 333-273697**

**February 27, 2026**

**PRICING TERM SHEET**

**(To Preliminary Prospectus Supplement dated February 25, 2026)**

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| | | |
|:---|:---|:---|
| Issuer: | Mississippi Power Company (the "Company") | Mississippi Power Company (the "Company") |
| Security: | Series 2026A Floating Rate Senior Notes due May 15, 2076 (the "Series 2026A Senior Notes") | Series 2026A Floating Rate Senior Notes due May 15, 2076 (the "Series 2026A Senior Notes") |
| Expected Ratings:\* | A3(Stable)/A-(Stable)/A(Stable) (Moody's/Standard & Poor's/Fitch) | A3(Stable)/A-(Stable)/A(Stable) (Moody's/Standard & Poor's/Fitch) |
| Principal Amount: | $74830000 | $74830000 |
| Initial Public Offering Price: | 100% | 100% |
| Maturity Date: | May 15, 2076 | May 15, 2076 |
| Interest and Interest Payment Dates: | Floating rate based on Compounded SOFR (calculated as described in the Preliminary Prospectus Supplement), minus 0.35%, calculated quarterly, and payable on February 15, May 15, August 15 and November 15 of each year, beginning May 15, 2026 | Floating rate based on Compounded SOFR (calculated as described in the Preliminary Prospectus Supplement), minus 0.35%, calculated quarterly, and payable on February 15, May 15, August 15 and November 15 of each year, beginning May 15, 2026 |
| Optional Redemption: | On or after May 15, 2056, the Company may redeem the Series 2026A Senior Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at the following redemption prices (in each case expressed as a percentage of the principal amount), if redeemed during the twelve-month periods beginning on May 15 as set forth below: | On or after May 15, 2056, the Company may redeem the Series 2026A Senior Notes at its option, in whole or in part, at any time and from time to time, upon not less than 10 nor more than 60 days' notice, at the following redemption prices (in each case expressed as a percentage of the principal amount), if redeemed during the twelve-month periods beginning on May 15 as set forth below: |
|  | **Twelve-Month Period Beginning on** | **Redemption Price** |
|  | May 15, 2056 | 105.00% |
|  | May 15, 2057 | 104.50% |
|  | May 15, 2058 | 104.00% |
|  | May 15, 2059 | 103.50% |
|  | May 15, 2060 | 103.00% |
|  | May 15, 2061 | 102.50% |
|  | May 15, 2062 | 102.00% |
|  | May 15, 2063 | 101.50% |
|  | May 15, 2064 | 101.00% |
|  | May 15, 2065 | 100.50% |
|  | May 15, 2066 | 100.00% |
|  | and thereafter at 100% of the principal amount, in each case, together with any accrued and unpaid interest thereon to but excluding the redemption date | and thereafter at 100% of the principal amount, in each case, together with any accrued and unpaid interest thereon to but excluding the redemption date |

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| | | |
|:---|:---|:---|
| Repayment at Option of Holder: | The Series 2026A Senior Notes will be repayable at the option of a holder of the Series 2026A Senior Notes, in whole or in part, on the repayment dates and at the repayment prices (in each case expressed as a percentage of the principal amount) as set forth below: | The Series 2026A Senior Notes will be repayable at the option of a holder of the Series 2026A Senior Notes, in whole or in part, on the repayment dates and at the repayment prices (in each case expressed as a percentage of the principal amount) as set forth below: |
|  | **Repayment Date** | **Repayment<br>Price** |
|  | May 15, 2027 | 98.00% |
|  | November 15, 2027 | 98.00% |
|  | May 15, 2028 | 98.00% |
|  | November 15, 2028 | 98.00% |
|  | May 15, 2029 | 98.00% |
|  | November 15, 2029 | 98.00% |
|  | May 15, 2030 | 98.00% |
|  | November 15, 2030 | 98.00% |
|  | May 15, 2031 | 98.00% |
|  | November 15, 2031 | 99.00% |
|  | May 15, 2032 | 99.00% |
|  | November 15, 2032 | 99.00% |
|  | May 15, 2033 | 99.00% |
|  | November 15, 2033 | 99.00% |
|  | May 15, 2034 | 99.00% |
|  | November 15, 2034 | 99.00% |
|  | May 15, 2035 | 99.00% |
|  | November 15, 2035 | 99.00% |
|  | May 15, 2036 | 99.00% |
|  | November 15, 2036 | 99.00% |
|  | May 15, 2037 | 100.00% |
|  | and on May 15 of every second year thereafter, through and including May 15, 2073, at 100% of the principal amount, in each case, together with any accrued and unpaid interest thereon to but excluding the repayment date | and on May 15 of every second year thereafter, through and including May 15, 2073, at 100% of the principal amount, in each case, together with any accrued and unpaid interest thereon to but excluding the repayment date |
| Format: | SEC Registered | SEC Registered |
| Denominations: | $1,000 and integral multiples of $1,000 | $1,000 and integral multiples of $1,000 |
| CUSIP/ISIN: | 605417 CE2/US605417CE21 | 605417 CE2/US605417CE21 |
| Trade Date: | February 27, 2026 | February 27, 2026 |
| Expected Settlement Date: | March 3, 2026 (T+2) | March 3, 2026 (T+2) |
| Book-Running Manager: | RBC Capital Markets, LLC | RBC Capital Markets, LLC |

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\*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 website 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 calling the Company collect at 1-404-506-5579 or RBC Capital Markets, LLC toll free at 1-866-375-6829.

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