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MK

Douglas K Mellinger

DirectorActively Reporting
Current role
Director · Marathon Digital
Current holdings (from latest Form 3/4/5)
Marathon Digital MARA: 231,618 shares ≈ $1.71M (0.06% of co.) (as of 2026-06-22)
Insider activity since 2022-12
Invested $603.8K (312,170 shares acquired)
↳ notional today: $2.30M
Divested $811.2K (71,552 shares sold)
↳ notional today: $527.7K
→ Net divested $207.4K
↳ net notional: ↑ $1.77M
Change since first tracked filing (not total holdings; see methodology). Prices as of 2026-10-19.

Douglas Mellinger is the Lead Independent Director at Marathon Digital (since March 31, 2022) and chairs the Nominating and Corporate Governance Committee. He holds a B.S. in Entrepreneurial Science from Syracuse University and is age 61.

Mellinger has been a Managing Director at Clarion Capital Partners since 2013, a lower middle market private equity and structured credit asset management firm where he focuses on value creation across portfolio companies. Previously, he held senior positions at Palm Ventures and Zeno Ventures, providing strategic and operational expertise to high-growth businesses.

He founded enherent Corp, serving as Founder, Chairman and Chief Executive Officer, building a global software development and services firm that earned recognition on the Inc. 500 list and Deloitte's Technology Fast 500 and Fast 50 rankings. Mellinger is also co-founder of Foundation Source, the leading provider of outsourced services and technology for private foundations. He currently serves on the boards of IEC and Campden IPI, and has held directorships across numerous private and public companies, as well as advisory positions with government agencies, universities, and nonprofit organizations. He is a past leader within Young Entrepreneurs' Organization and Young Presidents' Organization.

Biography extracted from Marathon Digital DEF 14A filed 2026-04-30 View cached copy (2026-08-31)Live source ↗

Roles

Contiguous filings for the same role are collapsed into a single tenure span. Click a row to see the underlying filings.

CompanyRoleTenureFilings
Marathon DigitalDirector2002-12 → present (23y 10mo)23
Show 23 underlying filings
2026-06-22 · Marathon Digital Form 4 filed 2026-06-24
View cached copy (2026-08-30)Live source ↗
2026-02-13 · Marathon Digital Form 4 filed 2026-02-13
View cached copy (2026-09-13)Live source ↗
2025-11-10 · Marathon Digital Form 4 filed 2025-11-12
View cached copy (2026-09-13)Live source ↗
2025-10-07 · Marathon Digital Form 4 filed 2025-10-08
View cached copy (2026-09-13)Live source ↗
2025-09-10 · Marathon Digital Form 4 filed 2025-09-11
View cached copy (2026-09-13)Live source ↗
2025-08-07 · Marathon Digital Form 4 filed 2025-08-08
View cached copy (2026-09-13)Live source ↗
2025-07-07 · Marathon Digital Form 4 filed 2025-07-09
View cached copy (2026-09-13)Live source ↗
2025-06-06 · Marathon Digital Form 4 filed 2025-06-10
View cached copy (2026-09-13)Live source ↗
2025-05-09 · Marathon Digital Form 4 filed 2025-05-13
View cached copy (2026-09-13)Live source ↗
2025-02-28 · Marathon Digital Form 4 filed 2025-02-28
View cached copy (2026-09-13)Live source ↗
2025-01-13 · Marathon Digital Form 4 filed 2025-01-15
View cached copy (2026-09-13)Live source ↗
2024-12-12 · Marathon Digital Form 4 filed 2024-12-16
View cached copy (2026-09-13)Live source ↗
2024-11-12 · Marathon Digital Form 4 filed 2024-11-13
View cached copy (2026-09-13)Live source ↗
2024-10-14 · Marathon Digital Form 4 filed 2024-10-16
View cached copy (2026-09-13)Live source ↗
2024-09-12 · Marathon Digital Form 4 filed 2024-09-16
View cached copy (2026-09-13)Live source ↗
2024-08-12 · Marathon Digital Form 4 filed 2024-08-14
View cached copy (2026-09-13)Live source ↗
2024-05-01 · Marathon Digital Form 4 filed 2024-05-06
View cached copy (2026-09-13)Live source ↗
2024-01-31 · Marathon Digital Form 4 filed 2024-02-02
View cached copy (2026-09-13)Live source ↗
2023-02-03 · Marathon Digital Form 4/A filed 2024-01-02
View cached copy (2026-09-13)Live source ↗
2023-01-16 · Marathon Digital Form 4 filed 2023-07-27
View cached copy (2026-09-13)Live source ↗
2022-12-28 · Marathon Digital Form 4/A filed 2022-12-30
View cached copy (2026-09-13)Live source ↗
2022-04-25 · Marathon Digital Form 3 filed 2022-05-05
View cached copy (2026-09-13)Live source ↗
2002-12-19 · Marathon Digital Form 4 filed 2022-12-22
View cached copy (2026-09-13)Live source ↗

Insider transactions

Totals for this person

BucketInvested (shares)Invested (USD)Divested (shares)Divested (USD)Net directionTxnsInvested @ last priceDivested @ last price
All time312,170$603.8K71,552$811.2K↓ Divested $207.4K26$2.30M$527.7K
202682,759$014,000$224.0K↓ Divested $224.0K3$610.3K$103.2K
202543,103$010,000$168.0K↓ Divested $168.0K9$317.9K$73.8K
202491,204$05,000$96.7K↓ Divested $96.7K7$672.6K$36.9K
2025-Q3-$03,000$49.7K↓ Divested $49.7K3$0$22.1K
2025-Q4-$02,000$37.3K↓ Divested $37.3K2$0$14.8K
2026-Q182,759$0-$0Flat1$610.3K$0
2026-Q2-$014,000$224.0K↓ Divested $224.0K2$0$103.2K

Invested = shares acquired (buys, grants, option exercises) — insider adding to the position. Divested = shares reduced (sells, dispositions, tax-withholding) — cash flowing TO the insider. Net direction shows which side wins on dollar terms in each bucket. % of holder's stake not yet computed (pending Form 3/4 holdings ingest). See methodology. The two @ last price columns restate the same share counts at the most recent share price we read (close of 2026-10-19); they are a valuation, not a cash flow, and they move every day the market does.

All transactions

DateCompanyKindSharesAmount (USD)Value @ last price
2026-06-22Marathon DigitalOpen-market sale7,000$112,000$51.6K
2026-06-22Marathon DigitalOpen-market sale7,000$112,000$51.6K
2026-02-13Marathon DigitalGrant / award / vesting82,759-$610.3K
2025-11-10Marathon DigitalOpen-market sale1,000$16,550$7.4K
2025-10-07Marathon DigitalOpen-market sale1,000$20,710$7.4K
2025-09-10Marathon DigitalOpen-market sale1,000$16,100$7.4K
2025-08-07Marathon DigitalOpen-market sale1,000$16,210$7.4K
2025-07-07Marathon DigitalOpen-market sale1,000$17,420$7.4K
2025-06-06Marathon DigitalOpen-market sale1,000$16,000$7.4K
2025-05-09Marathon DigitalOpen-market sale3,000$48,000$22.1K
2025-02-28Marathon DigitalGrant / award / vesting43,103-$317.9K
2025-01-13Marathon DigitalOpen-market sale1,000$17,000$7.4K
2024-12-12Marathon DigitalOpen-market sale1,000$23,800$7.4K
2024-11-12Marathon DigitalOpen-market sale1,000$24,060$7.4K
2024-10-14Marathon DigitalOpen-market sale1,000$16,770$7.4K
2024-09-12Marathon DigitalOpen-market sale1,000$16,000$7.4K
2024-08-12Marathon DigitalOpen-market sale1,000$16,050$7.4K
2024-05-01Marathon DigitalGrant / award / vesting28,887-$213.0K
2024-01-31Marathon DigitalGrant / award / vesting62,317-$459.6K
2023-02-03Marathon DigitalOpen-market sale10,000$72,500$73.8K
Show older transactions (6 more)
DateCompanyKindSharesAmount (USD)Value @ last price
2023-01-16Marathon DigitalDerivative conversion32,552$249,999$240.1K
2023-01-16Marathon DigitalGrant / award / vesting · RSUs32,552$249,999$240.1K
2023-01-16Marathon DigitalSale to issuer (buyback) · RSUs32,552$249,999$240.1K
2022-12-28Marathon DigitalOpen-market purchase10,000$32,700$73.8K
2022-12-28Marathon DigitalOpen-market purchase10,000$32,700$73.8K
2022-12-19Marathon DigitalOpen-market purchase10,000$38,400$73.8K