Mark B Segall
CIK 1116572 · last filed 2026-03-17
Mark B Segall is a corporate insider who has filed 30 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing, for BELFB, was dated Mar 17, 2026. Across all open-market trades the lifetime net is −$87.0K, making them a net seller over the disclosed history. Current disclosed insider exposure totals $3.5M across reported positions. 4 SEC filings were submitted jointly with ATMI INC.
"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.
Filer Profile
NEW YORK, NY 10024
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| BELFB | Director | 13,527 | $259.46 | $3.51M | $0 | 7 | 2026-03-17 |
| NCMI | Director | 8,553 | $2.10 | $17.9K | -$139.5K | 13 | 2023-02-27 |
| ATMI INC (ATMI) Delisted | Director | 5,121 | — | — | $0 | 2 | 2014-02-14 |
| Answers CORP (ANSW) Delisted | Director | 5,500 | — | — | $52.5K | 7 | 2010-09-17 |
Recent Filings
30 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-03-17 | BELFB | Grant (A) | +1,030 | $0 | EDGAR |
| 2026-02-25 | BELFB | Gift (G) | −300 | $0 | EDGAR |
| 2025-03-18 | BELFB | Grant (A) | +405 | $0 | EDGAR |
| 2024-01-17 | BELFB | Grant (A) | +392 | $0 | EDGAR |
| 2023-02-27 | NCMI | Exer (M) | +53,571 | $0 | EDGAR |
| 2022-05-06 | NCMI | Grant (A) | — | $0 | EDGAR |
| 2022-02-23 | NCMI | Exer (M) | +13,440 | $0 | EDGAR |
| 2021-03-11 | NCMI | Sell (S) | −30,000 | -$139.5K | EDGAR |
| 2021-02-24 | NCMI | Exer (M) | +7,708 | $0 | EDGAR |
| 2021-01-22 | NCMI | Grant (A) | — | $0 | 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.