Summary
Latest filing:
Steven B. Klinsky is Director, 10% Owner of New Mountain Finance Corp (NMFC). 20 SEC Form 4 filings on record going back to 2024, most recently on 12 March 2026. Most recent open-market trade: bought $1.48M of NMFC on 12 March 2026. Lifetime open-market purchases: $27.72M. Historical track record: 2/5 stars across 64 tracked purchases.
Recent Transactions
20Every recent SEC Form 4 transaction Steven B. Klinsky has reported, most recent first.
- New Mountain Private Credit FundP - Open-market purchase
12.6K shares @ --
- New Mountain Private Credit FundP - Open-market purchase
12.6K shares @ --
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 |
|---|---|
| InsiderAlpha rating | ★★☆☆☆ (2/5) |
| Total purchases tracked | 64 |
| Purchases with forward-return data | 64 |
| 30-day win rate | 31% |
| 90-day win rate | 59% |
| Avg 5-day return | +0.59% |
| Avg 30-day return | -0.79% |
| Avg 90-day return | +0.70% |
| Best 30-day return | +10.02% |
Trading Pattern
InsiderAlpha's records for Steven B. Klinsky go back to 2024: 20 primary Form 4 filings, an average of 6.7 per year. The typical open-market purchase is $408K (68 buys totaling $27.72M). The largest single buy on record is $1.48M of NMFC in 2026. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Steven B. Klinsky 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.
- John P. Malfettone - $612K of NMFC open-market activity in the last 12 months
- Adam B. Weinstein - $422K of NMFC open-market activity in the last 12 months
- David Ogens - $98K of NMFC open-market activity in the last 12 months
- Laura C. Holson Boswerger - $97K of NMFC 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 Steven B. Klinsky?
Steven B. Klinsky is a corporate insider, tracked as Director, 10% Owner of New Mountain Finance Corp (NMFC). InsiderAlpha holds 20 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Steven B. Klinsky last file a Form 4?
The most recent primary Form 4 on record is dated 12 March 2026, one of 20 filings going back to 2024.
Has Steven B. Klinsky been buying or selling stock?
Recorded transactions: 68 open-market purchases ($27.72M) and 0 open-market sales across all tracked filings.
How accurate is Steven B. Klinsky's historical track record?
Across 64 tracked purchases, Steven B. Klinsky averaged -0.8% avg 30-day return with a 31% 30-day win rate. InsiderAlpha rates the track record at 2/5 stars.
Where can I see all of Steven B. Klinsky'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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