A Mark Zeffiro
CIK 1446066 · President, CEO · last filed 2026-10-21
A Mark Zeffiro is a President, CEO who has filed 65 SEC Form 4 insider transactions across 3 companies since 2008. The most recent filing shows the insider disposed of $2.3M of ATKR on Oct 21, 2026. Across all open-market trades the lifetime net is −$4.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $4.4M across reported positions. 32 SEC filings were submitted jointly with TRIMAS CORP.
"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.
TRS 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
SUITE 555
TROY, MI 48084
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ATKR | Director | 0 | $94.96 | $0 | -$1.25M | 23 | 2026-10-21 |
| Horizon Global Corp (HZN) Delisted | President, CEO | 342,696 | $1.76 | $603.1K | -$295.7K | 11 | 2018-03-05 |
| TRS | Executive Vice President & CFO | 113,562 | $38.32 | $4.35M | -$3.35M | 29 | 2014-10-31 |
Recent Filings
65 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-10-21 | ATKR | Disp (D) | −23,993 | -$2.28M | EDGAR |
| 2026-08-31 | ATKR | Grant (A) | +48 | $0 | EDGAR |
| 2026-06-02 | ATKR | Grant (A) | +54 | $0 | EDGAR |
| 2026-03-03 | ATKR | Grant (A) | +69 | $0 | EDGAR |
| 2026-02-02 | ATKR | Grant (A) | +2,275 | $0 | EDGAR |
| 2025-12-19 | ATKR | Grant (A) | +67 | $0 | EDGAR |
| 2025-09-03 | ATKR | Grant (A) | +73 | $0 | EDGAR |
| 2025-05-30 | ATKR | Grant (A) | +64 | $0 | EDGAR |
| 2025-03-03 | ATKR | Grant (A) | +66 | $0 | EDGAR |
| 2025-01-31 | ATKR | Grant (A) | +1,795 | $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.