Gregory Mumford CFO appointment
Company: Cipher Mining
What the later record shows
Delivered on time · happened October 14, 2025
The proxy states Mumford was appointed CFO effective October 14, 2025, and he signed later filings as CFO.
“Mr. Mumford was appointed as the Company’s Chief Financial Officer effective October 14, 2025.”
2026-04-19 · Cipher Mining DEF 14A filed 2026-04-20 View cached copy (2026-08-31)Live source ↗
“Gregory Mumford has served as Cipher’s Chief Financial Officer since October 2025.”
2026-04-19 · Cipher Mining DEF 14A filed 2026-04-20 View cached copy (2026-08-31)Live source ↗
Checked October 10, 2026 against filings, releases and reporting published after the claim was made. Quotes are verbatim from the linked documents.
The claim, verbatim
Gregory Mumford was appointed Chief Financial Officer, effective October 14, 2025
Source (primary)
Cipher Mining 8-K filed 2025-10-06 (SEC EDGAR, sec_filing)
View cached copy (2026-08-31)Live source ↗
Quote: “Cipher announced the appointment of Gregory Mumford as Cipher's Chief Financial Officer, effective October 14, 2025.”
How we checked this
Checked on October 11, 2026. The cited source supports every part of this claim.
The 8-K states that Cipher announced Mumford's appointment as CFO, effective October 14, 2025, succeeding Farrell.
Confirmed in the source:
- Gregory Mumford was appointed Chief Financial Officer of Cipher Mining Inc.
- Gregory Mumford's appointment as CFO was effective October 14, 2025
What we did: Read our cached copy of SEC EDGAR (https://www.sec.gov/Archives/edgar/data/1819989/000181998925000095/cifr-20251006.htm) in full (8,131 characters, retrieved August 31, 2026) and checked each assertion in the claim against it.
Additional evidence
confirms Cipher Mining 8-K filed 2025-10-06
Quote: “Cipher announced the appointment of Gregory Mumford as Cipher's Chief Financial Officer, effective October 14, 2025.”
confirms cipher-mining 8-K exhibit (cifrex991xcfotransitionpre.htm)
Quote: “Greg Mumford has been appointed incoming CFO. Both appointments will take effect upon Mr. Farrell’s retirement on October 14, 2025.”
confirms Cipher Mining DEF 14A filed 2026-04-20
Quote: “Mr. Mumford was appointed as the Company’s Chief Financial Officer effective October 14, 2025.”