Steven B Klinsky
CIK 1018327 · last filed 2026-03-12
Steven B Klinsky is a corporate insider who has filed 69 SEC Form 4 insider transactions across 8 companies since 2008. The most recent filing shows the insider bought $4.0M of NMFCZ on Mar 12, 2026. Across all open-market trades the lifetime net is −$1.90B, making them a net seller over the disclosed history. Current disclosed insider exposure totals $1.55B across reported positions. 25 SEC filings were submitted jointly with New Mountain Capital, L.L.C.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
AVTR price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
1633 BROADWAY, 48TH FLOOR
NEW YORK, NY 10019
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| NMFCZ | Director | 127,998 | $25.00 | $3.20M | $27.72M | 19 | 2026-03-12 |
| NMFC | Director | 8,329,773 | $6.95 | $57.89M | $57.69M | 26 | 2023-03-21 |
| Signify Health, Inc. (SGFY) Delisted | Director | 67,764 | $30.49 | $2.07M | $0 | 1 | 2022-05-23 |
| Bellerophon Therapeutics, Inc. (BLPH) Delisted | 10%+ Owner | 609,231 | $0.01 | $7.3K | -$6.58M | 1 | 2021-03-22 |
| New Mountain Finance Corp (NMFX) Delisted | Director | 7,669,913 | — | — | $13.34M | 6 | 2020-06-01 |
| AVTR | 10%+ Owner | 89,591,565 | $16.12 | $1.44B | -$1.99B | 1 | 2020-05-28 |
| DELTEK, INC (PROJ) Delisted | Director | 36,713,972 | — | — | $476.0K | 2 | 2009-05-29 |
| EROC | 10%+ Owner | 5,572,692 | $8.32 | $46.39M | -$2.81M | 1 | 2009-01-21 |
Recent Filings
69 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-12 | NMFCZ | Buy (P) | +500,000 | $4.03M | EDGAR |
| 2026-03-06 | NMFCZ | Buy (P) | +237,873 | $1.93M | EDGAR |
| 2026-03-05 | NMFCZ | Buy (P) | +437,400 | $3.52M | EDGAR |
| 2026-03-03 | NMFCZ | Buy (P) | +324,727 | $2.52M | EDGAR |
| 2025-09-18 | NMFCZ | Buy (P) | +106,691 | $1.04M | EDGAR |
| 2025-02-14 | — | Other (J) | +5,967,347 | $0 | |
| 2024-12-19 | NMFCZ | Buy (P) | +72,280 | $815.6K | EDGAR |
| 2024-12-19 | — | Mixed | +6,165,988 | $0 | |
| 2024-12-17 | NMFCZ | Buy (P) | +100,502 | $1.18M | EDGAR |
| 2024-12-13 | NMFCZ | Buy (P) | +31,596 | $371.1K | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.