CIFR CFO Gregory Mumford files Form 3 showing zero beneficial ownership

Rhea-AI Filing Summary

Cipher Mining (CIFR) filed a Form 3 for its Chief Financial Officer, Gregory Mumford, reflecting his initial statement of beneficial ownership as of 10/14/2025. The filing states that no securities are beneficially owned by the reporting person at this time.

The form was executed by an attorney-in-fact under a Power of Attorney (Exhibit 24) and signed on 10/16/2025. This is a routine ownership disclosure required for company insiders.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Mumford Gregory J.D.

(Last) (First) (Middle)

C/O CIPHER MINING INC.

1 VANDERBILT AVENUE, FLOOR 54

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/14/2025

3. Issuer Name and Ticker or Trading Symbol
Cipher Mining Inc. [ CIFR ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ William Iwaschuk, Attorney-in-Fact for Gregory Mumford	10/16/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Cipher Mining (CIFR) file?

A Form 3, the initial statement of beneficial ownership for an insider.

Who is the reporting person in this Form 3 for CIFR?

The reporting person is Gregory Mumford, Chief Financial Officer.

What does the Form 3 report about holdings?

It states that no securities are beneficially owned by the reporting person.

What is the date of the event requiring the statement?

The event date is 10/14/2025.

Who signed the filing and under what authority?

It was signed by William Iwaschuk as attorney-in-fact under Exhibit 24 - Power of Attorney on 10/16/2025.

What is the relationship of the reporting person to CIFR?

He is an Officer, serving as Chief Financial Officer.