Gregory J.D. Mumford
Gregory J.D. Mumford: Chief Financial Officer at Cipher Mining. What Gregory J.D. Mumford holds in an AI or semiconductor company tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.
Cipher Mining (CIFR)
Gregory J.D. Mumford holds 37,316 Cipher Mining shares (0.01% of the company), worth about $578,211.42 at the last price, according to the Form 4 of Sep 30, 2026.
- Shares held: 37,316 (0.01%), $578,211.42 — Held in their own name.
- Share units: 528,981 (0.13%), $8.2M — Cipher Mining promised them as pay: each unit becomes a share when it vests, if its conditions are met. No vote until then.
Declarations
- Cipher Mining (CIFR) — Form 4 of Sep 30, 2026 (Chief Financial Officer): option exercise or conversion of 17,109; 37,316 shares after 0002090886-26-000008
- Cipher Mining (CIFR) — Form 4 of Jun 30, 2026 (Chief Financial Officer): option exercise or conversion of 17,108; shares withheld for tax of 6,895 at $24.50; 20,207 shares after 0002090886-26-000006
- Cipher Mining (CIFR) — Form 4 of Mar 31, 2026 (Chief Financial Officer): option exercise or conversion of 17,108; shares withheld for tax of 7,114 at $12.87; 9,994 shares after 0001819989-26-000012
- Cipher Mining (CIFR) — Form 4 of Feb 25, 2026 (Chief Financial Officer) 0002090886-26-000002
- Cipher Mining (CIFR) — Form 4 of Oct 14, 2025 (Chief Financial Officer) 0002090886-25-000003
- Cipher Mining (CIFR) — Form 3 of Oct 14, 2025 (Chief Financial Officer); 0 shares after 0001819989-25-000105
Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.