Summary
Updated Aug 31, 2026
Mark D. Klein is Chairman, CEO and President, Director of Neostellar Capital Corp. (NSLR). 10 SEC Form 4 filings on record going back to 2024, most recently on 10 August 2026. Most recent open-market trade: bought $250K of NSLR on 10 August 2026. Lifetime open-market purchases: $862K.
Recent Transactions
17Every recent SEC Form 4 transaction Mark D. Klein has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| Total purchases tracked | 8 |
Trading Pattern
InsiderAlpha's records for Mark D. Klein go back to 2024: 10 primary Form 4 filings, an average of 3.3 per year. The typical open-market purchase is $96K (9 buys totaling $862K). The largest single buy on record is $250K of NSLR 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 D. Klein 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.
- Erik A. Falk - $511K of NSLR open-market activity in the last 12 months
- Ronald M. Lott - $9K of NSLR 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 D. Klein?
Mark D. Klein is a corporate insider, tracked as Chairman, CEO and President, Director of Neostellar Capital Corp. (NSLR). InsiderAlpha holds 10 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 Mark D. Klein submitted recently?
2 primary Form 4 filings in the last 90 days, covering 1 company.
Has Mark D. Klein been buying or selling stock?
Recorded transactions: 9 open-market purchases ($862K) and 0 open-market sales across all tracked filings.
How accurate is Mark D. Klein's historical track record?
Across 8 tracked purchases, Mark D. Klein averaged no 30-day data yet with a win rate pending.
Where can I see all of Mark D. Klein'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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