Matthew A Lindenbaum
CIK 927943 · last filed 2026-09-03
Matthew A Lindenbaum is a corporate insider who has filed 22 SEC Form 4 insider transactions across 5 companies since 2015. The most recent filing, for RM, was dated Sep 3, 2026. Across all open-market trades the lifetime net is −$62.9M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $42.9M across reported positions. 185 SEC filings were submitted jointly with Bennett D Lindenbaum.
"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.
DCOMP 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
10TH FLOOR
NEW YORK, NY 10022
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| RM | Director | 23,118 | $34.37 | $794.6K | $5.73M | 4 | 2026-09-03 |
| DCOM | Director | 1,084,289 | $38.83 | $42.10M | -$24.20M | 1 | 2026-08-03 |
| Dime Community Bancshares, Inc. /NY/ (DCOMP) Delisted | Director | 186,769 | $18.51 | $3.46M | -$47.46M | 10 | 2026-02-03 |
| Dime Community Bancshares, Inc. /NY/ (BDGE) Delisted | Director | 711,870 | — | — | $4.17M | 5 | 2018-10-09 |
| HUDSON VALLEY HOLDING CORP (HVB) Delisted | Director | 0 | — | — | -$1.14M | 2 | 2015-07-02 |
Recent Filings
22 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-09-03 | RM | Mixed | +106,676 | $3.52M | EDGAR |
| 2026-08-03 | DCOM | Sell (S) | −592,312 | -$24.20M | EDGAR |
| 2026-02-24 | RM | Sell (S) | −72,352 | -$2.49M | EDGAR |
| 2026-02-03 | Dime Community Bancshares, Inc. /NY/ (DCOMP) Delisted | Sell (S) | −83,517 | -$2.86M | EDGAR |
| 2025-11-06 | Dime Community Bancshares, Inc. /NY/ (DCOMP) Delisted | Mixed | — | $616 | EDGAR |
| 2025-02-04 | Dime Community Bancshares, Inc. /NY/ (DCOMP) Delisted | Buy (P) | +3,129 | $97.7K | EDGAR |
| 2024-10-03 | Dime Community Bancshares, Inc. /NY/ (DCOMP) Delisted | Grant (A) | +1,860 | $0 | EDGAR |
| 2023-08-31 | Dime Community Bancshares, Inc. /NY/ (DCOMP) Delisted | Mixed | — | $37.0K | EDGAR |
| 2023-06-02 | RM | Buy (P) | +200,648 | $5.23M | EDGAR |
| 2023-05-30 | RM | Mixed | +160,576 | $3.14M | 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.