Company: CIFRW
Filing Date: 2025-05-23
Form Type: 424B5
Source: 0001193125-25-125868
Chunk: 21

Company: Cipher Mining Inc.
Filing Date: 2025-05-23
Form: 424B5
Chunk 21
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 a straddle, appreciated financial position, synthetic security, 
 hedge, conversion transaction or other integrated investment or risk reduction transaction; and               |

| • |     | certain former citizens or long-term residents of the United States. |

PROSPECTIVE INVESTORS SHOULD CONSULT WITH THEIR OWN TAX ADVISORS WITH RESPECT TO THE APPLICATION OF THE U.S. FEDERAL INCOME TAX LAWS (INCLUDING ANY POTENTIAL FUTURE CHANGES THERETO) TO THEIR PARTICULAR SITUATION, AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR COMMON STOCK ARISING UNDER ANY OTHER TAX LAWS, INCLUDING U.S. FEDERAL ESTATE OR GIFT TAX LAWS OR UNDER THE LAWS OF ANY U.S. STATE OR LOCAL OR NON-U.S.TAXING JURISDICTION, OR UNDER ANY APPLICABLE INCOME TAX TREATY. S-13

Non-U.S.Holder Defined For purposes of this discussion, a “non-U.S.holder” is a beneficial owner of our common stock that is not for U.S. federal income tax purposes a partnership or any of the following:

| • |     | an individual who is a citizen or resident of the United States; |

| • |     | a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or 
 organized in or under the laws of the United States, any state thereof or the District of Columbia;      |

| • |     | an estate the income of which is subject to U.S. federal income tax regardless of its source; or |

| • |     | a trust (i) the administration of which is subject to the primary supervision of a U.S. court and which has                                                                                                                        
 one or more “United States persons” (within the meaning of Section 7701(a)(30) of the Code) who have the authority to control all substantial decisions of the trust or (ii) which has made a valid election under applicable U.S. 
 Treasury regulations to be treated as a United States person.                                                                                                                                                                      |

If an entity or arrangement treated as a partnership for U.S. federal income tax purposes holds our common stock, the tax treatment of a partner in such partnership generally will depend upon the status of the partner, the activities of such partnership and certain determinations made at the partner level. Accordingly, we urge partners in entities or arrangements treated as partnerships for U.S. federal income tax purposes considering the purchase of