Company: CIFRW
Filing Date: 2025-05-23
Form Type: 424B5
Source: 0001193125-25-125868
Chunk: 0

Company: Cipher Mining Inc.
Filing Date: 2025-05-23
Form: 424B5
Chunk 0
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Filed Pursuant to Rule 424(b)(5)
Registration No. 333-281908

EXPLANATORY NOTE

This filing is being made
pursuant to Rule 424(b)(5) under the Securities Act of 1933, as amended, solely to add the Calculation of Filing Fee table with respect to the Prospectus Supplement dated May 20 2025, filed by Cipher Mining Inc. with the Securities and Exchange
Commission relating to the offer and short sale of 17,540,000 shares of its common stock, par value $0.001 per share, as described in the Prospectus Supplement. This filing does not amend, modify, or alter such prior filing in any other respect. No
changes have been made to the prospectus supplement or the accompanying base prospectus.

PROSPECTUS SUPPLEMENT

(To Prospectus dated September 3, 2024)

17,540,000 Shares

Cipher Mining Inc.

Common Stock

This prospectus supplement relates to the offer and short sale of 17,540,000 shares of our common stock, par value $0.001 per share
(“common stock”), by Morgan Stanley & Co. LLC (the “Underwriter”), acting on behalf of itself and/or its affiliates, to facilitate hedging transactions by certain investors (“Convertible Arbitrage Investors”)
subscribing for our 1.75% convertible senior notes due 2030 (the “Notes”) in a concurrent notes offering (the “Concurrent Notes Offering”), as described below.

The number of shares of common stock subject to this offering is expected to be no greater than commercially reasonable initial short positions
of the Convertible Arbitrage Investors being established to facilitate their market risk hedging with respect to the Notes they acquire. We have been advised that the shares of common stock sold by the Underwriter in this offering will be borrowed
from non-affiliate third parties and will be: (x) purchased by the Underwriter from certain Convertible Arbitrage Investors who have sold them short to the Underwriter in connection with the Concurrent
Notes Offering and/or (y) sold short by the Underwriter to facilitate concurrent privately negotiated transactions between the Underwriter (or affiliates) with certain Convertible Arbitrage Investors seeking a short exposure to shares of our
common stock through a derivative, in an equivalent notional amount, in each case, with a view for the Underwriter to initially offer the shares of our common stock to the public at a price of $3.42 per