Nierenberg Investment Management Company, LLC
CIK 1282683 · last filed 2026-07-24
"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.
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Disclosed Exposure
$744.9K
Companies
8
Total Filings
64
Lifetime Open-Market Net
$196.08M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| RVSB | 10%+ Owner | 79,388 | $5.29 | $420.0K | -$79.0K | 1 | 2026-07-24 |
| POTBELLY CORP (PBPB) Delisted | 10%+ Owner | 127,317 | $17.12 | $2.18M | $1.62M | 4 | 2025-03-31 |
| ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Director | 559,683 | — | — | $16.05M | 18 | 2015-01-30 |
| ASSET ACCEPTANCE CAPITAL CORP (AACC) Delisted | 10%+ Owner | 645,234 | — | — | $45.38M | 10 | 2013-04-19 |
| MOVE | 10%+ Owner | 30,079 | $10.80 | $325.0K | $79.88M | 6 | 2012-11-06 |
| MEDCATH CORP (MDTH) Delisted | 10%+ Owner | 473,596 | — | — | $20.82M | 7 | 2011-06-02 |
| NATUS MEDICAL INC (BABY) Delisted | 10%+ Owner | 129,931 | — | — | $32.08M | 5 | 2010-02-24 |
| Azenta, Inc. (BRKS) Delisted | 10%+ Owner | 0 | $113.10 | $0 | $329.4K | 2 | 2008-07-25 |
Recent Filings · Page 6 of 7
64 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2008-04-08 | ASSET ACCEPTANCE CAPITAL CORP (AACC) Delisted | Buy (P) | +403,200 | $4.42M | EDGAR |
| 2008-04-08 | NATUS MEDICAL INC (BABY) Delisted | Buy (P) | +700,000 | $12.79M | EDGAR |
| 2008-03-04 | MEDCATH CORP (MDTH) Delisted | Buy (P) | +500,000 | $9.95M | EDGAR |
| 2008-01-29 | ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Buy (P) | +846,000 | $13.58M | EDGAR |
| 2008-01-08 | ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Buy (P) | +73,491 | $1.34M | EDGAR |
| 2008-01-08 | MEDCATH CORP (MDTH) Delisted | Buy (P) | +105,548 | $2.50M | EDGAR |
| 2007-12-31 | MEDCATH CORP (MDTH) Delisted | Buy (P) | +218,230 | $5.25M | EDGAR |
| 2007-12-20 | MEDCATH CORP (MDTH) Delisted | Buy (P) | +98,010 | $2.23M | EDGAR |
| 2007-11-09 | ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Buy (P) | +125,538 | $2.44M | EDGAR |
| 2007-11-05 | ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted | Buy (P) | +93,600 | $1.89M | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.
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.