While this is an unfortunate situation if you inform your grandmother it would be considered insider trading. Insider Trading is considered a federal offense and occurs when someone takes confidential information regarding a company and it's stock and then uses it for a financial advantage. Telling grandma to sell her stock before statements are made public would be a classic example. I would hope that grandma would prefer you not serving time in a federal prison to loosing a portion of her life savings. Many famous people have been brought down by insider trading like Martha Stewart who famously served time and is now a felon.

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