SCHEDULE 13G Filed 2026-10-21 Event — SEC 0001104659-26-117904 →

Citadel Securities GP LLC → CIPHER DIGITAL INC. CIFR

Stake: — Shares: — CUSIP: 17253J106 Class: Common Stock, par value $0.001 per share (the "Shares")

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

6 filings by this filer

5 other filings in the data moat

Short Interest · settle 2026-09-30

DTC 2.18

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

Institutional Consensus · 2026-06-30

Held by elite portfolio managers

2 holders · $72.58M

Point72 Asset MgmtTiger Global

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	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 →
2025-09-17	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 Citadel Securities GP LLC

Filed	Form	Issuer	Stake	Shares
2026-10-15	SCHEDULE 13G	First Solar, Inc.	—	—	view →
2026-10-06	SCHEDULE 13G	AmpliTech Group, Inc.	—	—	view →
2026-07-27	SCHEDULE 13G	BITDEER TECHNOLOGIES GROUP	—	—	view →
2026-07-08	SCHEDULE 13G	POET TECHNOLOGIES INC. POET	—	—	view →
2026-05-27	SCHEDULE 13G	TERAWULF INC. WULF	—	—	view →

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