Company: CIFRW
Filing Date: 2025-04-21
Form Type: DEFA14A
Source: 0001819989-25-000028
Chunk: 0

Company: Cipher Mining Inc.
Filing Date: 2025-04-21
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

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

#### SCHEDULE 14A
<div align='center'>Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

_____________________________________________________________________</div>

Filed by the Registrant x Filed by a Party other than the Registrant o

Check the appropriate box:

o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

x Definitive Additional Materials

o Soliciting Material under § 240.14a-12

#### Cipher Mining 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 all boxes that apply):

x No fee required.

o Fee paid previously with preliminary materials.

o Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.