SCHEDULE 13D/A Filed 2026-05-18 Event 2026-05-13 SEC 0001123292-26-000680 →

Bitfury Top HoldCo B.V. → Cipher Digital Inc. CIFR

Stake: — Shares: 30,443,382 Class: Common Stock

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

2 transactions

0 buys · 0 sales · 1 awards/exercises

Issuer Cluster

8 13D/G filings on this issuer

7 other filings besides this one

Filer Track Record

8 filings by this filer

7 other filings in the data moat

Short Interest · settle 2026-09-30

DTC 2.18

75,161,099 shares short · +3.2% vs prior

Post-Filing Returns · since 2026-05-13 on CIFR

+1 day

+4.9%

+5 days

-10.0%

+30 days

+15.3%

+60 days

-5.4%

+90 days

—

+180 days

—

Anchor price 21.24 on closest trading day on/after 2026-05-13. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-10-14	Mumford Gregory J.D.	officer	Option exercise	125,000	—	—
2026-10-14	Mumford Gregory J.D.	officer	F	67,768	$9.94	$674K

Other 13D/G Filings on Cipher Digital Inc.

Filed	Form	Filer	Stake	Shares
2026-10-07	SCHEDULE 13D/A	Bitfury Top HoldCo B.V.	—	25,603,382	view →
2026-06-04	SCHEDULE 13D/A	Bitfury Top HoldCo B.V.	14.60%	28,643,382	view →
2026-05-13	SCHEDULE 13D/A	Bitfury Top HoldCo B.V.	—	30,443,382	view →
2025-09-17	SCHEDULE	Bitfury Top HoldCo B.V.	20.20%	79,442,259	view →
2025-08-11	SCHEDULE	Bitfury Top HoldCo B.V.	23.10%	90,942,259	view →
2024-11-12	SC	Bitfury Top HoldCo B.V.	—	—	view →
2024-02-26	SC	Bitfury Top HoldCo B.V.	—	—	view →

Other Filings by Bitfury Top HoldCo B.V.

Filed	Form	Issuer	Stake	Shares
2026-10-07	SCHEDULE 13D/A	Cipher Digital Inc.	—	25,603,382	view →
2026-06-04	SCHEDULE 13D/A	Cipher Digital Inc. CIFR	14.60%	28,643,382	view →
2026-05-13	SCHEDULE 13D/A	Cipher Digital Inc. CIFR	—	30,443,382	view →
2025-09-17	SCHEDULE	Cipher Mining Inc. CIFR	20.20%	79,442,259	view →
2025-08-11	SCHEDULE	Cipher Mining Inc. CIFR	23.10%	90,942,259	view →
2024-11-12	SC	Cipher Mining Inc. CIFR	—	—	view →
2024-02-26	SC	Cipher Mining Inc. CIFR	—	—	view →

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