Cipher Mining Inc. named Gregory Mumford chief financial officer in a release dated October 6, 20251. He succeeded Edward Farrell upon Farrell's retirement. Mumford came from Keefe, Bruyette & Woods, where the release said he had been a senior banker in the Digital Assets & Infrastructure Investment Banking group. The appointment took effect October 14, 2025, alongside Farrell's retirement.
The third executive hire at Cipher Mining on the record since 2021
Every move CryptoLately has verified there, by the day it became public
Moves: The Moves Ledger, CryptoLately's record of verified leadership moves, Oct. 3, 2016 to Oct. 2, 2026.
Read the chart as a table
| Date | Event |
|---|---|
| March 18, 2021 | Iwaschuk became CLO. William Iwaschuk was named Chief Legal Officer of Cipher Mining |
| March 20, 2023 | Iwaschuk became Co-President. William Iwaschuk was named Co-President of Cipher Mining |
| Oct. 6, 2025 | Farrell left as CFO. Edward Farrell left as Chief Financial Officer of Cipher Mining |
| Oct. 6, 2025 | Mumford became CFO. Gregory Mumford was named Chief Financial Officer of Cipher Mining |
59 executive hires on the record in 2025, the most of any year
Executive hires CryptoLately has verified, by year; 2026 through Oct. 2, 2026
- 2025: 59
- 2019, 2020, 2021, 2022, 2023, 2024, 2026
Moves: The Moves Ledger, CryptoLately's record of verified leadership moves, Oct. 3, 2016 to Oct. 2, 2026.
Read the chart as a table
| Item | Value |
|---|---|
| 2019 | 11 |
| 2020 | 12 |
| 2021 | 27 |
| 2022 | 37 |
| 2023 | 20 |
| 2024 | 39 |
| 2025 | 59 |
| 2026 | 45 |
The move
Chief executive Tyler Page tied the hire directly to Mumford's dealmaking record. “We are thrilled to welcome Greg to the Cipher team at such an exciting time for the Company. His track record as a dealmaker, structuring complex transactions and navigating dynamic capital markets, makes him uniquely well-suited to help us capitalize on the extraordinary momentum and opportunities we are seeing in the HPC space,” Page said in the release1. Quiver Quantitative's summary of the filing credited Mumford's background "particularly in digital assets and capital markets" as "vital for Cipher's growth in the high-performance computing sector"2. The release said Mumford would lead Cipher's finance department, sit on its executive management team, and report to Page.
Before and after at Cipher Mining
Mumford spent more than a decade in finance before joining Cipher, the release said1. His most recent post, at Keefe, Bruyette & Woods, focused on digital infrastructure deals. He arrived at Cipher with zero prior tenure there, a contrast with Farrell, the outgoing CFO the release credited with taking the company public in 2021. At Cipher, Mumford's mandate covers "strategic advisory, structuring, and capital markets execution," the release said. Why hire an outside dealmaker to run internal finance? Page's own words pointed to "momentum and opportunities" in computing hosting, a newer business for the Bitcoin miner.
What to watch
Mumford's background in deals gives one marker to track. Page named computing hosting as Cipher's growth area, and its expansion over the next year would test that bet1. A second marker sits in Cipher's capital markets activity. Mumford's seat on the executive management team puts him in position to shape how the company raises money.
Sources
- Cipher Mining, "Cipher Mining Announces the Retirement of Edward Farrell, Chief Financial Officer, and the Appointment of Gregory Mumford as Successor," SEC 8-K exhibit, October 6, 2025, https://www.sec.gov/Archives/edgar/data/1819989/000181998925000095/cifrex991xcfotransitionpre.htm
- Quiver Quantitative, "Cipher Mining Inc. Announces CFO Transition as Ed Farrell Retires and Greg Mumford Takes Over," Quiver Quantitative, October 7, 2025, https://www.quiverquant.com/news/Cipher+Mining+Inc.+Announces+CFO+Transition+as+Ed+Farrell+Retires+and+Greg+Mumford+Takes+Over