Michael N. Chang

This profile gathers the share dealings of Michael N. Chang in Optimer Pharmaceuticals Inc. We count 53 filings; the first trade dates from 14 February 2007 and the latest from 24 October 2013.

The open-market record is one-sided, with 14 purchases worth €1.2M and not one sale. Buying on the open market means paying the going price with one's own funds, a different act from receiving shares as pay. Besides market trades, the filings include 4 share grants and 17 option exercises.

A typical purchase (the median) is worth €45k.

Most recently, on 28 October 2013, the filings show a transaction worth €8.0M in Optimer Pharmaceuticals Inc. The last purchase on record was published on 29 December 2009, which is 6,143 days ago. The median gap between a trade and its publication by SEC (Form 4) is 2 days. Section 16 rules allow two business days to file each Form 4. Source: insider filings from SEC (Form 4). Past trades are no guide to future returns.