Buffett Grabs More of This Stock, Plus Other Notable Insider Buying frender / iStock via Getty Images At the end of the previous week, the Oracle of Omaha yet again boosted his stake in a media giant’s tracking stocks, even with shares still in retreat. Meanwhile, a couple of industrials and a couple of biotechs also saw notable insider purchases made in the past week. Overall, insider buying has slowed.A well-known adage reminds us that corporate insiders and 10% owners really only buy shares of a compan ...