Company: BWXT
Filing Date: 2025-03-19
Form Type: 10-K/A
Source: 0001486957-25-000015
Chunk: 0

Company: BWX Technologies, Inc.
Filing Date: 2025-03-19
Form: 10-K/A
Chunk 0
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| UNITED STATES                      |
| SECURITIES AND EXCHANGE COMMISSION |
| Washington, D.C. 20549             |

#### FORM 10-K/A

#### Amendment No. 1
| (Mark One) 
 ☒          |     | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934     |     | For the fiscal year endedDecember 31, 2024. |
|:-----------|:----|:-----------------------------------------------------------------------------------------|:----|:--------------------------------------------|
|            |     |                                                                                          |     | OR                                          |
| ☐          |     | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |     |                                             |
|            |     |                                                                                          |     | For the transition period fromto.           |

#### Commission File Number 001-34658
| BWX TECHNOLOGIES, INC.                                 |
| (Exact name of registrant as specified in its charter) |

| Delaware                                                       |     |            |     |          |     |                          80-0558025 |
| (State or other jurisdiction of incorporation or organization) |     |            |     |          |     | -I.R.S. Employer Identification No. |
| 800 Main Street, 4th Floor                                     |     |            |     |          |     |                                     |
|                                                                |     | Lynchburg, |     | Virginia |     |                               24504 |
| (Address of principal executive offices)                       |     |            |     |          |     |                           -Zip Code |

<div align='center'>Registrant's Telephone Number, Including Area Code: ( 980) 365-4300</div>

| Securities Registered Pursuant to Section 12(b) of the Act: |     |                   |     |                                           |
| Title of each class                                         |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, $0.01 par value                               |     | BWXT              |     | New York Stock Exchange                   |

| Securities registered pursuant to Section 12(g) of the Act: None |

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐

Indicate by check mark if the registrant is not required to file reports pursuant