Company: WBD
Filing Date: 2025-08-07
Form Type: S-8
Source: 0001193125-25-175524
Chunk: 0

Company: Warner Bros. Discovery, Inc.
Filing Date: 2025-08-07
Form: S-8
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As filed with the Securities and Exchange Commission on August 7, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Warner Bros. Discovery, Inc. (Exact Name of Registrant as Specified in Its Charter)

| Delaware                                 |     |         35-2333914 |
| (State or Other Jurisdiction of          
 Incorporation or Organization)           |     |  - I.R.S. Employer 
 Identification No. |
| 230 Park Avenue South                    
 New York, New York                       |     |              10003 |
| (Address of Principal Executive Offices) |     |          -Zip Code |

Warner Bros. Discovery, Inc. 2011 Employee Stock Purchase Plan (Full Title of the Plan) Gunnar Wiedenfels Chief Financial Officer Warner Bros. Discovery, Inc. 230 Park Avenue South New York, New York 10003 (Name and Address of Agent for Service) 212-548-5555 (Telephone Number, Including Area Code, of Agent for Service) Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☒ |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE

This registration statement is being filed by Warner Bros. Discovery, Inc., a Delaware corporation (the “Registrant”), to register
an additional 25,000,000 shares of Series A common stock, par value $0.01 per share, of the Registrant (“Common Stock”) for issuance under the Warner