Nierenberg Investment Management Company, LLC — SEC Form 4 filings
SEC reporting owner CIK 1282683. 5 Form 4 filings on record with FilingPulse; latest filed 2026-07-24.
Transaction summary — filings shown
Covers all 5 filings on record, filed 2024-08-07 to 2026-07-24. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 14 legs across 4 filings — 108,854 shares, $807,618 total (shares × price as filed).
- Open-market sales (code S, non-derivative): 3 legs across 1 filing — 15,000 shares, $79,050 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 0.
- Largest priced transaction: purchase of 22,169 shares @ $9.36 ($207,502) in POTBELLY CORP, filed 2025-03-31.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| POTBELLY CORP (PBPB) | 10% owner | 4 | 14 legs · 108,854 sh · $807,618 | — | — |
| RIVERVIEW BANCORP INC (RSVB) | 10% owner | 1 | — | 3 legs · 15,000 sh · $79,050 | — |
Form 4 filings — Nierenberg Investment Management Company, LLC
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-07-24 | 4 | RIVERVIEW BANCORP INC (RSVB) | Sale (S): 5,000 @ $5.25 · Sale (S): 5,000 @ $5.27 · Sale (S): 5,000 @ $5.29 | EDGAR |
| 2025-03-31 | 4 | POTBELLY CORP (PBPB) jointly with Nierenberg David | Purchase (P): 22,169 @ $9.36 | EDGAR |
| 2025-01-10 | 4 | POTBELLY CORP (PBPB) jointly with Nierenberg David | Purchase (P): 7,500 @ $9.23 · Purchase (P): 100 @ $9.24 | EDGAR |
| 2024-12-20 | 4 | POTBELLY CORP (PBPB) jointly with Nierenberg David | Purchase (P): 1,590 @ $9.40 · Purchase (P): 3,150 @ $9.34 | EDGAR |
| 2024-08-07 | 4 | POTBELLY CORP (PBPB) jointly with Nierenberg David | Purchase (P): 13,886 @ $6.48 · Purchase (P): 25,268 @ $6.48 · Purchase (P): 6,618 @ $6.48 · Purchase (P): 1,571 @ $6.59 · Purchase (P): 2,859 @ $6.59 · Purchase (P): 749 @ $6.59 · +3 more | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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