Cipher Mining Inc. announced on October 6, 2025 that Edward Farrell, its first CFO, would retire October 14, 2025, and shift into a senior advisor role1. Eight days separated the announcement from the retirement. Gregory Mumford, a senior banker from Keefe, Bruyette & Woods, was named Farrell's successor as CFO in the same release. Quiver Quantitative reported the move on October 7, 2025, the day after Cipher Mining's own announcement2.
Four leadership moves 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 |
20 executive exits on the record in 2025
Executive exits CryptoLately has verified, by year; 2026 through Oct. 2, 2026
- 2025: 20
- 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 | 6 |
| 2020 | 1 |
| 2021 | 9 |
| 2022 | 9 |
| 2023 | 8 |
| 2024 | 11 |
| 2025 | 20 |
| 2026 | 27 |
The move
Chief executive Tyler Page framed Farrell's exit around his record at the company. “I want to extend my deepest gratitude to Ed for his exceptional leadership in building Cipher's solid foundation and guiding our growth with unmatched financial expertise. He has assembled an outstanding finance team that leaves us well-positioned for this transition and the opportunities ahead,” Page said in the October 6, 2025 release1. The release said Farrell would "continue to share his expertise, insights, and extensive experience with Cipher" as senior advisor, supporting the CFO handoff and providing strategic guidance. Quiver Quantitative's October 7, 2025 writeup put the retirement in financial terms. It noted Mumford's background in digital assets and capital markets would matter "for Cipher's growth in the high-performance computing sector"2.
Before and after at Cipher Mining
Farrell was Cipher Mining's first CFO. The release credited him with taking "the Company public in 2021" and guiding it “through the challenges and opportunities of its early years as a publicly traded company”1. He held the CFO post for Cipher Mining's full span as a Nasdaq-listed company, from 2021 to his October 14, 2025 retirement. His new senior advisor role carried a narrower mandate: support Mumford's handoff and offer guidance to Page, the release said. Mumford joined with more than a decade of finance, credit, and capital markets experience built entirely outside Cipher, and he took a seat on the executive management team on arrival.
What to watch
Mumford's mandate gives one figure to track. Page named computing hosting as Cipher's growth area, and a future earnings report would show whether it keeps growing under the new CFO. Farrell's retained advisor role gives a second marker. Page said he looked forward to "benefitting from his continued counsel in the future." A later filing would confirm that, or drop it1.
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