Company: CIFRW
Filing Date: 2025-10-06
Form Type: DEF 14A
Source: 0001819989-25-000096
Chunk: 1

Company: Cipher Mining Inc.
Filing Date: 2025-10-06
Form: DEF 14A
Chunk 1
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 future strategic partnerships, site expansions, acquisitions, financing transactions and equity incentive programs, and to ensure the Company maintains sufficient capacity to pursue growth opportunities and enhance long-term stockholder value.

The Proxy Statement attached to this letter provides you with more specific information concerning the Special Meeting, the Charter Amendment Proposal and other matters, including information as to how to cast your vote. The Company encourages you to read the entire Proxy Statement, including the appendices, carefully and in their entirety.

Your vote is important to us. Please act as soon as possible to vote your shares. It is important that your shares be represented at the meeting whether or not you plan to attend the Special Meeting via the Internet. Please vote electronically over the Internet, by telephone or, if you receive a paper copy of the proxy card by mail, by returning your signed proxy card in the envelope provided. You may also vote your shares online during the Special Meeting. Instructions on how to vote while participating at the meeting live via the Internet are posted at www.virtualshareholdermeeting.com/CIFR2025SM .

On behalf of the Board of Directors and management, it is my pleasure to express our appreciation for your continued support.

| Tyler Page              |
| Chief Executive Officer |

#### Cipher Mining Inc.

#### 1 Vanderbilt Avenue, Floor 54

#### New York, New York 10017

### NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

#### TO BE HELD ON OCTOBER 30, 2025
NOTICE IS HEREBY GIVEN that the Special Meeting of Stockholders of Cipher Mining Inc., a Delaware corporation, will be held on October 30, 2025, at 8:00 a.m., Eastern Time. The Special Meeting will be a completely virtual meeting, which will be conducted via live webcast. You will be able to attend the Special Meeting online and submit your questions during the meeting by visiting www.virtualshareholdermeeting.com/CIFR2025SM . For instructions on how to attend and vote your shares at the Special Meeting, see the information in the accompanying Proxy Statement in the section titled “General Information about the Special Meeting and Voting—How can I attend and vote at the Special Meeting?”

The Special Meeting is being held:

1. to approve an amendment to the Company’s Second Amended and Restated Certificate of Incorporation to increase the number of shares of common stock, par value $0.001 per share, authorized for issuance from 500,000,000 shares to 1,000,000,000 shares