Summary
Updated Aug 31, 2026
Douglas K. Mellinger is Director of MARA Holdings, Inc. (MARA). 12 SEC Form 4 filings on record going back to 2024, most recently on 25 June 2026. Most recent open-market trade: sold $112K of MARA on 25 June 2026. Lifetime open-market sales: $328K.
Recent Transactions
12Every recent SEC Form 4 transaction Douglas K. Mellinger has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Douglas K. Mellinger go back to 2024: 12 primary Form 4 filings, an average of 4.0 per year. 6 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Douglas K. Mellinger files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Frederick G. Thiel - $4.45M of MARA open-market activity in the last 12 months
- Salman Hassan Khan - $3.37M of MARA open-market activity in the last 12 months
- Zabi Nowaid - $1.39M of MARA open-market activity in the last 12 months
- Vicki Mealer-Burke - $227K of MARA open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Douglas K. Mellinger?
Douglas K. Mellinger is a corporate insider, tracked as Director of MARA Holdings, Inc. (MARA). InsiderAlpha holds 12 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Douglas K. Mellinger submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Douglas K. Mellinger been buying or selling stock?
Recorded transactions: 0 open-market purchases and 11 open-market sales ($328K) across all tracked filings.
Where can I see all of Douglas K. Mellinger's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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