Investor Nierenberg Investment Management Company, Inc.
13D/G Filings

This page shows a list of all the recent 13D/G filings made by Nierenberg Investment Management Company, Inc. . Schedule 13D is commonly referred to as a “beneficial ownership report.” The term "beneficial owner" is defined under SEC rules. It includes any person who directly or indirectly shares voting power or investment power (the power to sell the security).

When a person or group of persons acquires beneficial ownership of more than 5% of a voting class of a company’s equity securities, they are required to file a Schedule 13D within ten days after the purchase. Click the link icon to see the full transaction history.

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Date Form Target Prev
Shares		 Current
Shares		 Change
(Percent)		 Ownership
(Percent)		 Change
(Percent)
2025-07-15 13D/A RVSB / Riverview Bancorp, Inc. 1,884,292 2,095,910
2025-06-09 13D/A RVSB / Riverview Bancorp, Inc. 1,625,065 1,884,292
2025-03-06 13D/A RVSB / Riverview Bancorp, Inc. 1,349,557 1,625,065
2024-11-21 13D/A RVSB / Riverview Bancorp, Inc. 1,060,600 1,349,557
2024-08-21 13D RVSB / Riverview Bancorp, Inc. 1,060,600 1,060,600
2024-08-07 13G RVSB / Riverview Bancorp, Inc. 1,060,600
2023-12-21 13D/A PBPB / Potbelly Corporation 2,805,865 2,925,865
2023-12-21 13D/A PBPB / Potbelly Corporation 2,805,865 2,925,865
2023-12-19 13D/A FTK / Flotek Industries, Inc. 7,218,241 1,317,566
2023-08-08 13D/A PBPB / Potbelly Corporation 2,710,320 2,805,865
2023-06-09 13D/A FTK / Flotek Industries, Inc. 7,789,773 7,218,241
2023-03-09 13G BLI / Berkeley Lights Inc 3,662,074
2022-07-21 13D PBPB / Potbelly Corporation 2,136,254 2,710,320
2022-03-23 13D/A FTK / Flotek Industries, Inc. 7,753,778 7,789,773
2022-02-11 13G/A PBPB / Potbelly Corporation 1,443,086 2,136,254
2022-02-04 13D/A FTK / Flotek Industries, Inc. 4,441,747 7,753,778
2021-11-22 13D/A CRD.B / Crawford & Company 1,564,025 39,624
2021-05-07 13G PBPB / Potbelly Corporation 1,443,086
2021-03-26 13D/A US44244K1097 / Houston Wire & Cable Company 2,043,358 2,043,358
2020-12-28 13D/A CRD.B / Crawford & Company 1,317,962 1,564,025
2020-10-30 13D CRD.B / Crawford & Company 1,317,962
2020-09-03 13D/A FTK / Flotek Industries, Inc. 3,514,062 4,441,747
2020-08-26 13D/A GEOS / Geospace Technologies Corporation 699,240 552,765
2020-05-27 13D GEOS / Geospace Technologies Corporation 699,240 699,240
2020-05-18 13G GEOS / Geospace Technologies Corporation 395,334 699,240
2020-03-18 13D/A US44244K1097 / Houston Wire & Cable Company 1,643,558 2,043,358
2020-03-16 13D FTK / Flotek Industries, Inc. 3,514,062
2020-01-21 13G/A GEOS / Geospace Technologies Corporation 395,334
2019-12-23 13D/A US44244K1097 / Houston Wire & Cable Company 1,651,135 1,643,558
2019-03-13 13D/A US44244K1097 / Houston Wire & Cable Company 1,651,135 1,651,135
2019-02-08 13D/A GEOS / Geospace Technologies Corporation
2018-12-19 13D/A US44244K1097 / Houston Wire & Cable Company 1,487,830 1,651,135
2018-04-23 13G GEOS / Geospace Technologies Corporation
2018-01-04 13D US44244K1097 / Houston Wire & Cable Company 1,374,851 1,487,830
2017-12-01 13D/A US7777801074 / Rosetta Stone, Inc.
2017-09-27 13D US44244K1097 / Houston Wire & Cable Company 1,374,851
2017-07-19 13D/A RSYS / RadiSys Corp. 1,589,653
2017-05-17 13D/A US7777801074 / Rosetta Stone, Inc.
2017-02-06 13D/A ESIO / Electro Scientific Industries, Inc.
2017-02-02 13D/A RSYS / RadiSys Corp.
2017-01-31 13G/A US44244K1097 / Houston Wire & Cable Company
2016-10-07 13D/A ESIO / Electro Scientific Industries, Inc.
2016-02-24 13D/A ESIO / Electro Scientific Industries, Inc.
2016-02-16 13G/A US44244K1097 / Houston Wire & Cable Company
2015-06-08 13G US44244K1097 / Houston Wire & Cable Company
2015-04-17 13D/A US7777801074 / Rosetta Stone, Inc.
2015-03-16 13D/A US7777801074 / Rosetta Stone, Inc.
2015-02-13 13G/A TECU / Tecumseh Products Co
2015-01-30 13D/A ESIO / Electro Scientific Industries, Inc.
2014-11-12 13D/A RSYS / RadiSys Corp.
2014-08-25 13D/A US7777801074 / Rosetta Stone, Inc.
2014-08-11 13D/A US7777801074 / Rosetta Stone, Inc.
2014-06-16 13D US7777801074 / Rosetta Stone, Inc.
2014-02-12 13G/A US7777801074 / Rosetta Stone, Inc.
2014-02-12 13G/A TECU / Tecumseh Products Co
2014-01-21 13D/A RSYS / RadiSys Corp.
2013-08-30 13G TECU / Tecumseh Products Co
2013-08-05 13D/A MOVE / Movano Inc.
2013-07-26 13D/A MOVE / Movano Inc.
2013-06-13 13D/A MOVE / Movano Inc.
2013-05-03 13D/A AACC / Asset Acceptance Capital Corp 0
2013-05-02 13D/A AACC / Asset Acceptance Capital Corp
2013-04-19 13D/A AACC / Asset Acceptance Capital Corp
2013-02-12 13G/A US7777801074 / Rosetta Stone, Inc.
2012-11-29 13D/A MOVE / Movano Inc.
2012-08-10 13D/A ESIO / Electro Scientific Industries, Inc.
2012-05-18 13G US7777801074 / Rosetta Stone, Inc.
2012-02-22 13D/A ESIO / Electro Scientific Industries, Inc.
2012-02-13 13G/A HPY / Heartland Payment Systems, Inc. 0