David Nierenberg

This profile gathers the share dealings of David Nierenberg across 5 companies, led by Flotek Industries Inc/CN/, Rosetta Stone Inc and Riverview Bancorp Inc. The record holds 183 filings, for trades running from 19 May 2016 to 28 March 2025.

The open-market side counts 118 purchases for €6.7M alongside 51 sales for €14.9M. Sales outweigh purchases by €8.2M. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. Other entries cover 9 share grants. Since January 2025: 2 purchases and no sales on the market.

The median purchase comes to €28k. 70 out of 118 purchases came within 30 days of a purchase by at least one other insider of the same company. Purchases made close together by different insiders form what is called a cluster. After 92 purchases with a full 90-day history, the hit rate stands at 17% and the median 90-day move at -12.6%. Past outcomes like these are no guarantee of what comes next.

The newest entry dates from 31 March 2025: an open-market purchase of €192k, in Potbelly Corp. Typically, a trade is published a median of 2 days after it takes place. The legal deadline for a Form 4 is two business days after the transaction. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.