David Nierenberg

Companies

• FLOTEK INDUSTRIES INC/CN/Board member Jun 5, 2018 to Dec 15, 2023¹
• Rosetta StoneBoard member Apr 17, 2015 to Oct 16, 2020²
• RIVERVIEW BANCORP INCBoard member May 3, 2016 to Mar 17, 2020³
• Electro Scientific IndustriesBoard member May 16, 2011 to May 18, 2015⁴

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• FIFLOTEK INDUSTRIES INC/CN/ FTK117,836 shares⁵$2.9M at $24.48Dec 15, 2023

As of each latest filing. The line shows shares held over time.

Recent filings

• Mar 28, 2025Bought 22,169 shares at $9.36 of POTBELLY CORP⁶
• Jan 7, 2025Bought 100 shares at $9.24 of POTBELLY CORP⁷
• Jan 7, 2025Bought 7,500 shares at $9.23 of POTBELLY CORP⁷
• Dec 18, 2024Bought 3,150 shares at $9.34 of POTBELLY CORP⁸
• Dec 18, 2024Bought 1,590 shares at $9.40 of POTBELLY CORP⁸
• Dec 14, 2023Bought 748 shares at $3.72 of FLOTEK INDUSTRIES INC/CN/⁵
• Dec 14, 2023Bought 11,948 shares at $3.72 of FLOTEK INDUSTRIES INC/CN/⁵
• Dec 14, 2023Bought 6,785 shares at $3.72 of FLOTEK INDUSTRIES INC/CN/⁵
• Dec 13, 2023Bought 1,272 shares at $3.53 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 13, 2023Bought 20,310 shares at $3.53 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 13, 2023Bought 11,536 shares at $3.53 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 12, 2023Bought 858 shares at $3.42 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 12, 2023Bought 6,923 shares at $3.42 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 12, 2023Bought 4,954 shares at $3.42 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 11, 2023Bought 3,752 shares at $3.19 of FLOTEK INDUSTRIES INC/CN/⁹
• Dec 11, 2023Bought 5,254 shares at $3.19 of FLOTEK INDUSTRIES INC/CN/⁹
• Jul 1, 2023Granted 241,096 shares of FLOTEK INDUSTRIES INC/CN/¹⁰
• Jun 7, 2023Sold 211,080 shares at $0.63 of FLOTEK INDUSTRIES INC/CN/¹¹
• Jun 7, 2023Sold 538,920 shares at $0.63 of FLOTEK INDUSTRIES INC/CN/¹¹
• Jan 20, 2023Granted 13,179 shares of FLOTEK INDUSTRIES INC/CN/¹²
• Aug 4, 2022Granted 165,289 shares of FLOTEK INDUSTRIES INC/CN/¹³
• Mar 21, 2022Converted 76,808 shares of FLOTEK INDUSTRIES INC/CN/¹⁴
• Mar 21, 2022Converted 1,680,008 shares of FLOTEK INDUSTRIES INC/CN/¹⁴
• Mar 21, 2022Converted 1,036,214 shares of FLOTEK INDUSTRIES INC/CN/¹⁴