Summary
Updated Aug 31, 2026
Mark W. Marinko is SR VP, Chief Financial Officer of SunCoke Energy, Inc. (SXC). 2 SEC Form 4 filings on record, most recently on 26 February 2026. Most recent open-market trade: bought $56K of SXC on 26 February 2026. Lifetime open-market purchases: $58K.
Recent Transactions
9Every recent SEC Form 4 transaction Mark W. Marinko has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Mark W. Marinko go back to 2026: 2 primary Form 4 filings, an average of 2.0 per year. The typical open-market purchase is $29K (2 buys totaling $58K). The largest single buy on record is $56K of SXC in 2026. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Mark W. Marinko 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.
- Phillip Michael Hardesty - $153K of SXC open-market activity in the last 12 months
- Ratta Ralph M. Della Jr. - $50K of SXC open-market activity in the last 12 months
- Andrei Alexander Mikhalevsky - $28K of SXC 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 Mark W. Marinko?
Mark W. Marinko is a corporate insider, tracked as SR VP, Chief Financial Officer of SunCoke Energy, Inc. (SXC). InsiderAlpha holds 2 primary Form 4 filings for them, the earliest from 2026, updated as new SEC EDGAR filings are processed.
When did Mark W. Marinko last file a Form 4?
The most recent primary Form 4 on record is dated 26 February 2026, one of 2 filings going back to 2026.
Has Mark W. Marinko been buying or selling stock?
Recorded transactions: 2 open-market purchases ($58K) and 0 open-market sales across all tracked filings.
Where can I see all of Mark W. Marinko'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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