Company: NET
Filing Date: 2025-04-21
Form Type: DEFA14A
Source: 0001477333-25-000067
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Company: Cloudflare, Inc.
Filing Date: 2025-04-21
Form: DEFA14A
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---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
<div align='center'>_____________________________________________________________________</div>

#### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the

#### Securities Exchange Act of 1934
<div align='center'>_____________________________________________________________________</div>

| Filed by the Registrantx                    |
| Filed by a Party other than the Registrant¨ |

| Check the appropriate box: |     |                                                                                 |
| ¨                          |     | Preliminary Proxy Statement                                                     |
| ¨                          |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ¨                          |     | Definitive Proxy Statement                                                      |
| x                          |     | Definitive Additional Materials                                                 |
| ¨                          |     | Soliciting Material under §240.14a-12                                           |

#### CLOUDFLARE, INC.
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

| Payment of Filing Fee (Check the appropriate box): |     |                                                                                                      |
| x                                                  |     | No fee required.                                                                                     |
| ¨                                                  |     | Fee paid previously with preliminary materials.                                                      |
| ¨                                                  |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |