Nierenberg Investment Management Company, LLC
CIK 1282683 · last filed 2026-07-24
Nierenberg Investment Management Company, LLC is a corporate insider who has filed 64 SEC Form 4 insider transactions across 8 companies since 2007. The most recent filing shows the insider sold $79.0K of RVSB on Jul 24, 2026. Across all open-market trades the lifetime net is +$31.6M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $536.5K across reported positions. The firm reports its address in Camas, WA. 194 SEC filings were submitted jointly with David Nierenberg.
"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 |
|---|---|---|---|---|---|---|---|
| RVSB | 10%+ Owner | 79,388 | $6.13 | $486.6K | -$79.0K | 1 | 2026-07-24 |
| POTBELLY CORP (PBPB) Delisted | 10%+ Owner | 229,636 | $17.12 | $3.93M | $807.6K | 4 | 2025-03-31 |
| ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Director | 0 | — | — | $4.66M | 18 | 2015-01-30 |
| ASSET ACCEPTANCE CAPITAL CORP (AACC) Delisted | 10%+ Owner | 645,234 | — | — | $5.35M | 10 | 2013-04-19 |
| MOVE | 10%+ Owner | 7,795 | $6.40 | $49.9K | $11.63M | 6 | 2012-11-06 |
| MEDCATH CORP (MDTH) Delisted | 10%+ Owner | 1,798,863 | — | — | $4.48M | 7 | 2011-06-02 |
| NATUS MEDICAL INC (BABY) Delisted | 10%+ Owner | 446,056 | — | — | $4.68M | 5 | 2010-02-24 |
| Azenta, Inc. (BRKS) Delisted | 10%+ Owner | 0 | $113.10 | $0 | $109.8K | 2 | 2008-07-25 |
Recent Filings
64 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-24 | RVSB | Sell (S) | −15,000 | -$79.0K | EDGAR |
| 2025-03-31 | POTBELLY CORP (PBPB) Delisted | Buy (P) | +22,169 | $207.5K | EDGAR |
| 2025-01-10 | POTBELLY CORP (PBPB) Delisted | Buy (P) | +7,600 | $70.1K | EDGAR |
| 2024-12-20 | POTBELLY CORP (PBPB) Delisted | Buy (P) | +4,740 | $44.4K | EDGAR |
| 2024-08-07 | POTBELLY CORP (PBPB) Delisted | Buy (P) | +74,345 | $485.6K | EDGAR |
| 2015-01-30 | ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Other (J) | −253,084 | $0 | EDGAR |
| 2014-11-12 | — | Sell (S) | −801,176 | -$1.96M | |
| 2014-01-03 | — | Exer (M) | +1,875 | $0 | |
| 2013-12-05 | ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Grant (A) | +31 | $0 | EDGAR |
| 2013-09-06 | — | Grant (A) | — | $0 |
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.