Jane Street discloses 5.3% stake in Cipher Mining (CIFR)

Rhea-AI Filing Summary

Jane Street Group, LLC and affiliated entities filed an amended Schedule 13G reporting a sizeable position in Cipher Mining Inc. (CIFR) common stock. As of the event date of 12/31/2025, they beneficially owned 21,052,810 shares, representing 5.3% of the outstanding common stock.

The filing shows no sole voting or dispositive power, but shared voting and dispositive power over all reported shares. Subsidiaries include Jane Street Capital, LLC, Jane Street Options, LLC, and Jane Street Global Trading, LLC, which together hold the position. The group certifies the holdings are not for the purpose of changing or influencing control of Cipher Mining.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Cipher Mining Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

17253J106

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 17253J106

1

Names of Reporting Persons

JANE STREET GROUP, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 21,052,810.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 21,052,810.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

21,052,810.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.3 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 17253J106

1

Names of Reporting Persons

Jane Street Capital, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 98,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 98,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

98,900.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.0 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP No. 17253J106

1

Names of Reporting Persons

Jane Street Options, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 4,630,513.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,630,513.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,630,513.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.2 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

CUSIP No. 17253J106

1

Names of Reporting Persons

Jane Street Global Trading, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 16,323,397.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 16,323,397.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

16,323,397.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.1 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Cipher Mining Inc.
(b)	Address of issuer's principal executive offices: 1 VANDERBILT AVENUE, 1 VANDERBILT AVENUE, NEW YORK, NEW YORK, 10017.
Item 2.
(a)	Name of person filing: Jane Street Group, LLC; Jane Street Capital, LLC; Jane Street Options, LLC; Jane Street Global Trading, LLC
(b)	Address or principal business office or, if none, residence: Jane Street Group, LLC 250 Vesey Street 6th Floor New York, NY 10281 Jane Street Capital, LLC 250 Vesey Street 6th Floor New York, NY 10281 Jane Street Options, LLC 250 Vesey Street 6th Floor New York, NY 10281 Jane Street Global Trading, LLC 250 Vesey Street 6th Floor New York, NY 10281
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock, par value $0.001 per share
(e)	CUSIP No.: 17253J106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 21,052,810.00
(b)	Percent of class: 5.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 21,052,810.00
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 21,052,810.00
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Subsidiary Jane Street Capital, LLC Jane Street Options, LLC Jane Street Global Trading, LLC
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

JANE STREET GROUP, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	02/12/2026

Jane Street Capital, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	02/12/2026

Jane Street Options, LLC

Signature:	Jeremy Kahn (Authorized Signatory)
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	02/12/2026

Jane Street Global Trading, LLC

Signature:	/s/ Jeremy Kahn
Name/Title:	Jeremy Kahn (Authorized Signatory)
Date:	02/12/2026

FAQ

What stake does Jane Street report in Cipher Mining (CIFR)?

Jane Street Group, LLC and affiliates report beneficial ownership of 21,052,810 Cipher Mining shares, representing 5.3% of the common stock as of December 31, 2025, according to their amended Schedule 13G filing.

Which Jane Street entities hold Cipher Mining (CIFR) shares?

The filing lists Jane Street Group, LLC and subsidiaries Jane Street Capital, LLC, Jane Street Options, LLC, and Jane Street Global Trading, LLC as reporting persons, together beneficially owning 21,052,810 Cipher Mining common shares.

Does Jane Street seek to influence control of Cipher Mining (CIFR)?

The filing states the securities were not acquired and are not held for changing or influencing control of Cipher Mining. Jane Street certifies the position is not connected with any control-related transaction, consistent with a passive Schedule 13G filing.

What voting power does Jane Street have over Cipher Mining (CIFR) shares?

Jane Street reports zero sole voting power and 21,052,810 shares of shared voting power. It also reports no sole dispositive power and the same number of shares with shared dispositive power, reflecting coordinated control among the reporting entities.

When was Jane Street’s ownership in Cipher Mining (CIFR) measured?

The Schedule 13G/A identifies December 31, 2025 as the date of the event requiring the filing. The reported 21,052,810 shares and 5.3% ownership stake are stated as of that date in the disclosure.

How much does Jane Street Global Trading, LLC own of Cipher Mining (CIFR)?

Jane Street Global Trading, LLC reports beneficial ownership of 16,323,397 Cipher Mining shares, representing 4.1% of the common stock. This forms the largest part of the overall 21,052,810-share position reported by the Jane Street entities.