SEC Insider Transactions from Nierenberg David.

Last updated: 2026-03-14 11:36 UTC | Total transactions: 20

Nierenberg David bought Potbelly Corp ($PBPB) shares once on the open market in the last year, for a total of about $208,000. His most recent purchase occurred on March 28, 2025. This ranks him 1,502nd among nearly 5,000 insiders by purchase value, well below the average of $1.46 million across 3.3 transactions. He reported no open market sales.

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Transaction Date Company Ticker Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
March 28, 2025 POTBELLY CORP $PBPB Nierenberg David Not found P Common Stock 22169 $9.36 3,109,471.0000 30,720,000 0.72% 0.07%
Jan. 7, 2025 POTBELLY CORP $PBPB Nierenberg David Not found P Common Stock 7500 $9.23 3,087,202.0000 30,720,000 0.24% 0.02%
Jan. 7, 2025 POTBELLY CORP $PBPB Nierenberg David Not found P Common Stock 100 $9.24 3,087,302.0000 30,720,000 0.00% 0.00%
Dec. 18, 2024 POTBELLY CORP $PBPB Nierenberg David Not found P Common Stock 1590 $9.40 4,740.0000 30,842,000 50.48% 0.01%
Dec. 18, 2024 POTBELLY CORP $PBPB Nierenberg David Not found P Common Stock 3150 $9.34 4,740.0000 30,842,000 198.11% 0.01%
Dec. 14, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 6785 $3.72 1,317,566.0000 0 0.52% 0.00%
Dec. 14, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 11948 $3.72 1,317,566.0000 0 0.92% 0.00%
Dec. 14, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 748 $3.72 1,317,566.0000 0 0.06% 0.00%
Dec. 11, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 5254 $3.19 1,281,595.0000 0 0.41% 0.00%
Dec. 11, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 3752 $3.19 1,295,955.0000 0 0.29% 0.00%
Dec. 12, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 4954 $3.42 1,286,549.0000 0 0.39% 0.00%
Dec. 12, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 6923 $3.42 1,277,775.0000 0 0.54% 0.00%
Dec. 12, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 858 $3.42 1,296,813.0000 0 0.07% 0.00%
Dec. 13, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 11536 $3.53 1,298,085.0000 0 0.90% 0.00%
Dec. 13, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 20310 $3.53 1,298,085.0000 0 1.59% 0.00%
Dec. 13, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director P Common Shares 1272 $3.53 1,298,085.0000 0 0.10% 0.00%
July 1, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director A Common Shares 241096 $0.00 7,459,337.0000 0 3.34% 0.00%
June 7, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director S Common Shares 538920 $0.63 7,218,241.0000 0 6.95% 0.00%
June 7, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director S Common Shares 211080 $0.63 7,218,241.0000 0 2.84% 0.00%
Jan. 20, 2023 FLOTEK INDUSTRIES INC/CN/ $FTK Nierenberg David Director A Common Shares 13179 $0.00 7,968,241.0000 0 0.17% 0.00%