Cipher Mining Inc. (NASDAQ: CIFR) announced today, October 6 2025, that its Chief Financial Officer, Edward Farrell, will retire on October 14 2025 and that Gregory Mumford will assume the CFO role effective immediately. The company stated that Farrell will transition to a Senior Advisor position to support the finance team during the handover.
Farrell, Cipher’s first CFO, led the company through its initial public offering in 2021 and has been instrumental in building the firm’s financial foundation, managing capital structure, and navigating the volatile Bitcoin mining market. His tenure has seen the company raise significant capital, including a $150 million convertible notes offering in May 2025 and a $1.1 billion convertible senior notes offering in September 2025.
Mumford brings more than a decade of experience in financial services, credit, and capital markets, most recently as a senior banker in the Digital Assets & Infrastructure Investment Banking group at Keefe, Bruyette & Woods. He is expected to leverage his expertise in structuring complex transactions and capital markets execution to support Cipher’s growth in both Bitcoin mining and high‑performance computing data center development.
The CFO transition underscores Cipher’s commitment to maintaining strong financial leadership as it expands its dual‑play strategy. With Mumford’s background in digital infrastructure financing, the company aims to accelerate its HPC data center pipeline while preserving the disciplined treasury management that has underpinned its Bitcoin mining operations.
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