Michael S. Weiss

Filings by Michael S. Weiss span 6 companies, the busiest being Keryx Biopharmaceuticals Inc, TG Therapeutics, Inc. and Fortress Biotech, Inc. The record holds 274 filings, for trades running from 21 February 2006 to 18 March 2026.

The open-market side counts 11 purchases for €4.0M alongside 182 sales for €13.3M. The net balance comes to €9.3M on the selling side. A purchase on the market is a deliberate choice to commit personal money, which is why it draws more attention than a grant. The rest of the record consists of 54 share grants and 16 option exercises.

The median purchase comes to €175k. 2 out of 4 purchases came within 30 days of a purchase by at least one other insider of the same company. When several insiders buy within a few weeks of each other, analysts speak of a cluster purchase.

The record was last updated on 20 March 2026 with a share grant in Fortress Biotech, Inc. The latest purchase dates back some time: it was published 1,073 days ago, on 16 November 2023. Typically, a trade is published a median of 2 days after it takes place. For comparison, the SEC allows two business days to file a Form 4. A sale on its own says little: insiders also sell to pay tax, fund a purchase or diversify. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.