SCHEDULE 13D/A Filed 2026-06-04 Event 2026-06-02 SEC 0001123292-26-000806 →

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

Stake: 14.60% Shares: 28,643,382 CUSIP: 17253J106 Class: Common Stock

Composite Decision Signal · WATCH (DEVELOPING SETUP) Conviction Score: 55/100 · Filer 90d Win Rate: 100% · Hist. 90d Edge: +2.2%

Filer track record (5 filings): 100% 90d win rate, +2.2% 90d edge
High conviction ownership stake (14.6%)
Material 8-K governance/transaction event (Item 5.02 / 1.01 / 2.01) within ±30d
Held by 2 tracked 13F institutional managers
14 NPORT-P mutual funds holding CUSIP
Short interest building (+21.8% vs prior settlement)

Item 4 — Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended and supplemented by adding the following: This Amendment No. 23 is being filed for purposes of disclosing the Bitfury Top HoldCo Forward Contract described in this Amendment No. 23. The information contained in Item 5(c) of this Amendment No. 23 with respect thereto is incorporated by reference herein.

Cross-References

Insider Activity (last 365d)

2 transactions

0 buys · 0 sales · 1 awards/exercises

Issuer Cluster

10 13D/G filings on this issuer

9 other filings besides this one

Filer Track Record

8 filings by this filer

7 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 1.86

91,577,672 shares short · +21.8% vs prior

Institutional Consensus · 2026-06-30

Held by elite portfolio managers

2 holders · $72.58M

Point72 Asset MgmtTiger Global

Post-Filing Returns · since 2026-06-02 on CIFR

+1 day

-0.2%

+5 days

-7.6%

+30 days

-23.8%

+60 days

—

+90 days

—

+180 days

—

Anchor price 26.29 on closest trading day on/after 2026-06-02. 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
2026-10-21	SCHEDULE 13G	Citadel Securities GP LLC	—	—	view →
2026-10-21	SCHEDULE 13G	JANE STREET GROUP, LLC	—	—	view →
2026-10-07	SCHEDULE 13D/A	Bitfury Top HoldCo B.V.	—	25,603,382	view →
2026-05-18	SCHEDULE 13D/A	Bitfury Top HoldCo B.V.	—	30,443,382	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 →
2026-05-18	SCHEDULE 13D/A	Cipher Digital Inc. CIFR	—	30,443,382	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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