SCHEDULE Filed 2025-09-17 Event 2025-09-15 SEC 0001123292-25-000448 →

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

Stake: 20.20% Shares: 79,442,259 CUSIP: 17253J106 Class: Common Stock

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 41/100 · 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 (20.2%)
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

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

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 2025-09-15 on CIFR

+1 day

+6.1%

+5 days

+28.7%

+30 days

+93.8%

+60 days

+32.4%

+90 days

+35.9%

+180 days

+39.5%

Anchor price 10.85 on closest trading day on/after 2025-09-15. 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 Mining 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 →
2026-06-04	SCHEDULE 13D/A	Bitfury Top HoldCo B.V.	14.60%	28,643,382	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 →
2025-08-11	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 →
2026-05-18	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 →
2025-08-11	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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