Nierenberg David
- SEC CIK
- 0001040899
No open-market purchases or sales filed in the past year.
Current role at each company
- PBPB Potbelly Corp10% Owneras of Mar 31, 2025
- FTK Flotek Industries IncDirectoras of Dec 15, 2023
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- –
- 0 filings
- Sold
- –
- 0 filings
- Net
- –
- Bought minus sold
- Companies
- 0
- With open-market trades
Trades
Every Form 4 that lists Nierenberg David as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
PBPB Potbelly Corp
10% Owner4 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2025 (view filing)9:30 AM ET | Mar 28 | 3 days | Nierenberg David and 1 other10% Owner | PPurchase | +22.2K | $9.36 | +$207.5K | +21.7%124.2K after | |
| Jan 10, 2025 (view filing)7:45 PM ET | Jan 7 | 3 days | Nierenberg David and 1 other10% Owner | PPurchase | +7.60K | $9.23 | +$70.1K | +8.1%102.0K after | 2 lots |
| Dec 20, 2024 (view filing)4:37 PM ET | Dec 18 | 2 days | Nierenberg David and 1 other10% Owner | PPurchase | +4.74K | $9.36 | +$44.4K | New position3.15K after | 2 lots10b5-1 |
| Aug 7, 2024 (view filing)6:39 PM ET | Aug 5-7 | 2 days | Nierenberg David and 1 other10% Owner | PPurchase | +74.3K | $6.53 | +$485.6K | +238.9%105.5K after | 9 lots |
FTK Flotek Industries Inc
Director4 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Dec 15, 2023 (view filing) | Dec 14 | 1 day | Nierenberg DavidDirector | PPurchase | +19.5K | $3.72 | +$72.5K | +68.5%47.9K after | 3 lots |
| Dec 13, 2023 (view filing) | Dec 11-13 | 2 days | Nierenberg DavidDirector | PPurchase | +54.9K | $3.45 | +$189.2K | New position47.2K after | 8 lots |
| Jun 9, 2023 (view filing) | Jun 7 | 2 days | Nierenberg DavidDirector | SSale | −750.0K | $0.63 | −$472.5K | −23.5%2.44M after | 2 lots |
| Feb 4, 2022 (view filing)4:14 PM ET | Feb 2 | 2 days | Nierenberg DavidDirector | PPurchase | +3.45M | $0.8705 | +$3.00M | – | Derivative3 lots |