Dynamex (DDMX-OLD +37.8%) and MI Developments (MIM +29.1%) are among the biggest early gainers after late-Friday takeover announcements. Greenbriar Equity will take Dynamex private in a $210M deal; shareholders would receive $21.25/share in cash. ST Acquisition will buy the 40% of MIM it doesn't already own for $13/share in cash.