Nierenberg David (CIK 0001040899)

Latest company ownership

Shares held
130,869
Last filed at
Mar 17, 2020
Confidence Score
50.0
2025Q4
Confidence Score History
2016Q2 2025Q4
Shares held
69,929
Last filed at
Dec 15, 2023
Confidence Score
50.0
2025Q4
Confidence Score History
2019Q2 2025Q4
PBPB - POTBELLY CORP
Role: 10% Owner
Shares held
3,150
Last filed at
Dec 20, 2024
Confidence Score
50.6
2025Q4
Confidence Score History
2024Q3 2025Q4

Recent buy/sell transactions

Exec date Filing date Company Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Mar 28, 2025 Mar 31, 2025 POTBELLY CORP 10% Owner Buy 72.5 +22,169 0.72% ✗ $207.5K
Jan 7, 2025 Jan 10, 2025 POTBELLY CORP 10% Owner Buy 65.0 +7,600 0.25% ✗ $70.1K
Dec 18, 2024 Dec 20, 2024 POTBELLY CORP 10% Owner Buy 91.3 +4,740 100.00% ✗ $44.4K
Aug 5, 2024 Aug 7, 2024 POTBELLY CORP 10% Owner Buy 90.0 +74,345 3.00% ✗ $485.6K
Dec 14, 2023 Dec 15, 2023 FLOTEK INDUSTRIES INC/CN/ Director Buy 82.5 +19,481 1.50% ✗ $72.5K
Dec 11, 2023 Dec 13, 2023 FLOTEK INDUSTRIES INC/CN/ Director Buy 87.5 +54,859 4.41% ✗ $189.2K
Jun 7, 2023 Jun 9, 2023 FLOTEK INDUSTRIES INC/CN/ Director Sell 20.0 -750,000 -9.41% ✗ $468.8K
Nov 30, 2020 Dec 2, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 82.5 +49,231 1.06% ✗ $100.9K
Nov 23, 2020 Nov 25, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 90.0 +149,560 3.33% ✗ $297.6K
Sep 11, 2020 Sep 15, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 90.0 +115,318 2.55% ✗ $286.5K
Sep 8, 2020 Sep 10, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 82.5 +69,343 1.56% ✗ $168.8K
Sep 1, 2020 Sep 3, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 90.0 +163,420 3.81% ✗ $391.8K
Aug 20, 2020 Aug 24, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 100.0 +690,147 19.15% ✗ $1.4M
Mar 13, 2020 Mar 17, 2020 RIVERVIEW BANCORP INC Director Buy 95.0 +30,000 29.74% ✗ $149.4K
Mar 11, 2020 Mar 13, 2020 FLOTEK INDUSTRIES INC/CN/ Director Buy 97.5 +1,000,000 39.78% ✗ $973.5K
Sep 13, 2019 Sep 16, 2019 FLOTEK INDUSTRIES INC/CN/ Director Buy 90.0 +113,500 4.73% ✗ $284.4K
Sep 10, 2019 Sep 12, 2019 FLOTEK INDUSTRIES INC/CN/ Director Buy 97.5 +268,200 12.58% ✗ $642.3K
Sep 4, 2019 Sep 4, 2019 RIVERVIEW BANCORP INC Director Buy 95.0 +20,000 24.73% ✗ $137K
Jun 7, 2019 Jun 11, 2019 FLOTEK INDUSTRIES INC/CN/ Director Buy 92.5 +111,250 5.50% ✗ $400.5K
Jun 4, 2019 Jun 6, 2019 FLOTEK INDUSTRIES INC/CN/ Director Buy 97.5 +187,500 10.23% ✗ $645.6K
May 30, 2019 Jun 3, 2019 FLOTEK INDUSTRIES INC/CN/ Director Buy 92.5 +101,250 5.84% ✗ $316.2K
Oct 30, 2018 Nov 1, 2018 RIVERVIEW BANCORP INC Director Buy 95.0 +8,795 12.20% ✗ $72.7K
Jun 9, 2016 Jun 13, 2016 RIVERVIEW BANCORP INC Director Buy 95.0 +14,328 24.81% ✗ $66.7K
May 24, 2016 May 26, 2016 RIVERVIEW BANCORP INC Director Buy 95.0 +18,500 47.13% ✗ $88.6K
May 19, 2016 May 23, 2016 RIVERVIEW BANCORP INC Director Buy 95.0 +26,256 201.97% ✗ $122.7K