David Nierenberg
CIK 1040899 · last filed 2023-12-15
David Nierenberg is a corporate insider who has filed 97 SEC Form 4 insider transactions across 10 companies since 2007. The most recent filing shows the insider bought $72.5K of FTK on Dec 15, 2023. Across all open-market trades the lifetime net is −$18.1M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $21.5M across reported positions. 194 SEC filings were submitted jointly with Nierenberg Investment Management Company, LLC.
"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.
MOVE 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
CAMAS, WA 98607
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| FTK | Director | 835,079 | $24.72 | $20.64M | $5.68M | 26 | 2023-12-15 |
| ROSETTA STONE INC (RST) Delisted | Director | 0 | — | — | -$14.43M | 16 | 2020-10-16 |
| RVSB | Director | 130,869 | $6.13 | $802.2K | $637.0K | 6 | 2020-03-17 |
| Houston Wire & Cable CO (HWCC) Delisted | Director | 664,888 | $5.30 | $3.52M | $799.6K | 1 | 2020-03-17 |
| ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Director | 152,903 | — | — | $919.4K | 7 | 2015-05-18 |
| ASSET ACCEPTANCE CAPITAL CORP (AACC) Delisted | 10%+ Owner | 2,787,899 | — | — | $4.08M | 12 | 2013-04-16 |
| MOVE | 10%+ Owner | 14,553 | $6.40 | $93.1K | -$16.56M | 7 | 2012-11-29 |
| NATUS MEDICAL INC (BABY) Delisted | 10%+ Owner | 477,083 | — | — | -$9.41M | 6 | 2010-03-09 |
| MEXICAN RESTAURANTS INC (CASA) Delisted | 10%+ Owner | 0 | $0.04 | $0 | -$2.39M | 1 | 2009-12-02 |
| MEDCATH CORP (MDTH) Delisted | 10%+ Owner | 166,785 | — | — | $12.54M | 6 | 2008-08-27 |
Recent Filings
97 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2023-12-15 | FTK | Buy (P) | +19,481 | $72.5K | EDGAR |
| 2023-12-13 | FTK | Buy (P) | +54,859 | $189.2K | EDGAR |
| 2023-07-05 | FTK | Grant (A) | +241,096 | $0 | EDGAR |
| 2023-06-09 | FTK | Sell (S) | −750,000 | -$468.8K | EDGAR |
| 2023-01-24 | FTK | Grant (A) | +13,179 | $0 | EDGAR |
| 2022-08-08 | FTK | Grant (A) | +165,289 | $0 | EDGAR |
| 2022-03-23 | FTK | Conv (C) | +2,793,030 | $0 | EDGAR |
| 2022-02-04 | FTK | Buy (P) | — | $0 | EDGAR |
| 2021-06-21 | — | Disp (D) | −2,043,358 | $0 | |
| 2021-06-07 | FTK | Grant (A) | +103,774 | $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.